Ceramic coating, coated part, preparation method of coated part and household appliance

Abstract

The invention provides a ceramic coating, a coated part, a preparation method of the coated part and a household appliance. The ceramic coating comprises a composition A configured to be applied to the surface of a base material to form a bottom coating and a composition B configured to be applied to the bottom coating, the composition A comprises the following raw material components: sol and inorganic filler containing fibrous whisker toughening filler; the composition B comprises the following raw material components: sol, an inorganic filler containing a hardening filler, an organic silicon ceramic precursor and a catalyst; the inorganic filler in the raw material components of the composition A and / or the composition B also comprises an anticorrosive filler. According to the ceramic coating, the composition A and the composition B are matched, so that a coating formed by the ceramic coating has excellent easy-to-clean performance, meanwhile, the high temperature resistance of the coating is improved, the coating is not prone to cracking at the high temperature, and then it can be guaranteed that the coating still has excellent corrosion resistance at the high temperature of 400 DEG C.

Description

Technical Field

[0001] This invention belongs to the field of coating technology, specifically relating to a ceramic coating, coated parts, preparation methods thereof, and household appliances. Background Technology

[0002] Current metal corrosion protection technology mainly focuses on heavy-duty industrial corrosion protection for chemical equipment, ships, and other applications. Research on anti-corrosion coatings and their application in high-temperature environments, such as household ovens and grills, is insufficient, especially for gas-fired appliances where the temperature at the heating point can reach 400℃, placing higher demands on the high-temperature resistance of the coatings. When ovens are used in high-temperature environments, their inner walls are typically made of low-carbon steel coated with an enamel coating. However, this enamel coating is prone to cracking at high temperatures, leading to coating peeling and subsequent rusting in humid environments, severely impacting the oven's lifespan and cleaning efficiency. Some lower-priced ovens use galvanized steel for their inner liner; while cheaper, this material has poor corrosion resistance, is prone to oxidation at high temperatures, and has a shorter lifespan.

[0003] Teflon coatings and ceramic coatings are existing conventional coatings. Teflon (i.e., polytetrafluoroethylene, PTFE) coatings are widely used in food processing and chemical equipment due to their excellent non-stick properties, high temperature resistance, and corrosion resistance. However, the upper limit of the heat resistance of Teflon coatings is usually 260℃, and it cannot maintain stable performance at high temperatures of 400℃, making it difficult to meet the requirements for corrosion protection in high-temperature environments. Furthermore, the hardness and wear resistance of Teflon coatings are relatively low. Existing conventional ceramic coatings typically produce ceramic coatings with high hardness and wear resistance, but their easy-to-clean properties are poor, and their high-temperature resistance still needs improvement. They are prone to cracking at high temperatures (such as up to 400℃), and also fail to meet the requirements for corrosion protection in high-temperature environments. Summary of the Invention

[0004] The present invention aims to at least solve one of the aforementioned technical problems existing in the prior art. Therefore, one objective of the present invention is to provide a ceramic coating that produces a coating with excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties.

[0005] A second objective of this invention is to provide a coated part.

[0006] A third objective of this invention is to provide a method for preparing a coated part.

[0007] The fourth objective of this invention is to provide a household appliance.

[0008] A first aspect of the present invention provides a ceramic coating comprising composition A and composition B;

[0009] The raw material components of the composition A include sol A and inorganic filler A, wherein the inorganic filler A includes a toughening filler, and the toughening filler is a fibrous whisker toughening filler; the composition A is configured to be applied to the surface of a substrate to form a base coating.

[0010] The raw material components of the composition B include sol B, inorganic filler B, organosilicon ceramic precursor B, and catalyst B, wherein the inorganic filler B includes a hardening filler; the composition B is configured to be applied to the primer coating.

[0011] The inorganic packing A and / or the inorganic packing B also include corrosion-resistant packing.

[0012] The technical solution of this invention regarding ceramic coatings has at least the following beneficial effects:

[0013] This ceramic coating comprises composition A and composition B. Composition A is configured to be applied to the surface of a substrate to form a primer, and composition B is configured to be applied over the primer. In composition A, sol A forms a strong bond with the substrate. Furthermore, a toughening filler is added, specifically a fibrous whisker toughening filler, which deflects high-temperature stress and crack paths. The deflected crack paths are significantly elongated and tortuous, consuming more fracture energy. The crack formation on the coating changes from a simple opening mode to a mixed mode (such as shear / tear / pull-out mode), significantly increasing the energy required for crack propagation. This improves the crack-resistance of the coating, preventing crack formation and propagation. Simultaneously, the fibrous whisker structure of the toughening filler provides a bridging effect, including bridging the crack opening or unopened areas of the coating to prevent or hinder crack formation. In the raw material components of composition B, the organosilicon ceramic precursor B and sol B can react under the action of catalyst B to construct a hybrid network structure and undergo partial gelation. After being applied to the base coating of composition A, the unreacted organosilicon ceramic precursor B and its intermediate products (such as hydrolysis products) in composition B can react with the unreacted sol A in composition A to further construct and strengthen the hybrid network structure, thereby improving the coating's bonding strength, density, and high-temperature stability. At the same time, based on the fibrous whisker structure of the toughening filler in composition A, which is configured to be applied to the substrate surface, and its bridging effect, as well as the partial gelation of composition B, the inorganic filler A in composition A, including the fibrous whisker toughening filler, is basically maintained in the inner layer region close to the substrate, while the partially gelled composition B is more concentrated in the outer layer region of the coating to form a surface barrier. Thus, the coating as a whole forms an inner toughening and crack-resistant structure and a surface barrier structure. The inner layer structure close to the substrate can effectively toughen and prevent cracking, while the surface barrier layer can ensure the coating's corrosion resistance and help maintain surface smoothness, giving the coating excellent easy-to-clean properties. Therefore, by combining the above composition A and composition B, the coating can have excellent easy-to-clean properties, while also improving the coating's high-temperature resistance, making it less prone to cracking at high temperatures, and thus ensuring that the coating still has excellent anti-corrosion properties at 400℃.

[0014] The reaction between the organosilicon ceramic precursor B and sol B generally involves the hydrolysis of the organosilicon ceramic precursor B under the action of catalyst B to generate hydrolysis products (such as silanol Si-OH), followed by a co-condensation reaction between the hydrolysis products and sol B to form a hybrid network structure. Further, after composition B is applied to the base coating of composition A, the unreacted organosilicon ceramic precursor B and its intermediate products (such as the hydrolysis product silanol Si-OH) in composition B can react with the unreacted sol A in composition A. This reaction can include: further hydrolysis of the unreacted organosilicon ceramic precursor B to generate hydrolysis products (such as silanol Si-OH), which then undergo a co-condensation reaction with the unreacted sol A in composition A (including sol A that has not reacted with the substrate) to form a hybrid network structure; and / or, the unreacted hydrolysis products of the organosilicon ceramic precursor in composition B undergo a co-condensation reaction with the unreacted sol A in composition A (including sol A that has not reacted with the substrate) to form a hybrid network structure.

[0015] According to some embodiments of the present invention, the ceramic coating is configured such that, in use, composition A is first applied to the surface of a substrate to form a base layer, and then composition B is applied to the base layer, followed by curing to obtain a coating. That is, the ceramic coating is configured such that, in use, composition A and composition B are sequentially applied to the substrate, followed by curing to obtain a coating.

[0016] According to some embodiments of the present invention, fibrous whisker fillers that can be used as toughening fillers include, but are not limited to, at least one of the following materials: single-crystal SiC nanorods, carbon nanotube whiskers, potassium titanate whiskers, magnesium borate whiskers, magnesium oxide whiskers, aluminum borate whiskers, zinc oxide whiskers, halloysite whiskers, magnesium carbonate whiskers, boron carbide whiskers, silicon nitride whiskers, mullite whiskers, calcium sulfate whiskers, barium sulfate whiskers, Al2O3 whiskers, ZrO2 whiskers, and Si3N4 whiskers. These toughening fillers can effectively deflect high-temperature stress and crack paths, generate crack bridging effects, and complicate crack initiation modes, thereby improving the crack-resistant ability of the coating, effectively preventing crack initiation and propagation, and thus improving the high-temperature resistance and corrosion resistance of the constructed coating.

[0017] The inventors have discovered that single-crystal SiC nanorods, as toughening fillers, exhibit a particularly significant ability to prevent coating cracking. In some embodiments of the present invention, the toughening filler comprises single-crystal SiC nanorods. Single-crystal SiC nanorods possess high hardness, which, combined with their nanorod structure, creates a rigid barrier effect, effectively deflecting high-temperature stress and crack paths, extending crack paths, consuming more fracture energy, and transforming the crack initiation mode of the coating into a complex hybrid mode (including shear / tear / pull-out modes), increasing the energy required for propagation and effectively improving the crack-preventing ability of the coating. Simultaneously, the rod-like structure of single-crystal SiC nanorods can also create a bridging effect, effectively preventing crack formation and propagation in the coating. Furthermore, the single-crystal structure of the material exhibits stable performance in high-temperature resistance and corrosion protection, and its main structural parameters, including aspect ratio and coefficient of thermal expansion, are more compatible with the coating system, resulting in a better overall toughening effect.

[0018] According to some embodiments of the present invention, the toughening filler comprises at least one selected from carbon nanotube whiskers, potassium titanate whiskers, magnesium borate whiskers, magnesium oxide whiskers, aluminum borate whiskers, zinc oxide whiskers, halloysite whiskers, magnesium carbonate whiskers, boron carbide whiskers, silicon nitride whiskers, mullite whiskers, calcium sulfate whiskers, barium sulfate whiskers, Al2O3 whiskers, ZrO2 whiskers, and Si3N4 whiskers, and single-crystal SiC nanorods. That is, the toughening filler employs two or more types of fibrous whisker toughening fillers, and contains single-crystal SiC nanorods.

[0019] The above-mentioned combination of single-crystal SiC nanorods with other fibrous whisker toughening fillers can effectively improve the performance of ceramic coatings or coatings constructed with them through high-temperature stress and crack path deflection, crack bridging, crack initiation mode complication, complementary thermophysical properties and enhanced interface effects.

[0020] First, single-crystal SiC nanorods and other fibrous whisker toughening fillers can produce a synergistic toughening effect. Specifically, the fibrous whisker toughening fillers, including single-crystal SiC nanorods, have good flexibility and can effectively prevent crack propagation through bridging, deflecting high-temperature stress and crack paths, and complicating crack initiation modes. Their synergy can effectively improve the crack-resistance of the coating. Furthermore, different fibrous whisker toughening fillers have different interfacial bonding strengths, which can lead to the dissipation of cracks during propagation through various mechanisms such as debonding, pull-out, and branching, thereby more efficiently delaying fracture and preventing coating cracking.

[0021] Secondly, the above-mentioned single-crystal SiC nanorods and other fibrous whisker toughening fillers have complementary thermophysical properties. A single fibrous whisker toughening filler may have a large difference in the coefficient of thermal expansion (CTE) with the substrate of the surface coating to be constructed, resulting in interfacial stress concentration at high temperatures. However, the combination of different fibrous whisker toughening fillers (including between single-crystal SiC nanorods and other toughening fillers, and between different toughening fillers other than single-crystal SiC nanorods) can adjust the overall CTE of the coating and reduce microcracks in thermal cycling.

[0022] Furthermore, combining single-crystal SiC nanorods with other fibrous whisker toughening fillers can enhance the interfacial effect. Specifically, different toughening fillers (such as single-crystal SiC nanorods with other fibrous whisker toughening fillers, and other different fibrous whisker toughening fillers besides single-crystal SiC nanorods) form different interfacial energy levels with the substrate to which the surface coating is to be constructed, which can form a gradient interfacial layer, delaying crack propagation. Moreover, the difference in interfacial bonding will hinder the straight-line propagation of cracks, further delaying crack propagation.

[0023] Furthermore, toughening fillers with different sizes and / or shapes can be used to form a hierarchical reinforcement structure, optimize or refine the coating microstructure, and reduce stress concentration; and can also optimize the coating packing density, reduce porosity, and improve mechanical properties. The toughening fillers with different sizes and / or shapes include at least one of the following: single-crystal SiC nanorods and other fibrous whisker toughening fillers having different sizes and / or shapes; using single-crystal SiC nanorods with different sizes and / or shapes; or using other fibrous whisker toughening fillers (other than single-crystal SiC nanorods) with different sizes and / or shapes. For example, in the toughening filler used, the length of other fibrous whisker toughening fillers is greater than the length of single-crystal SiC nanorods; or, in addition to single-crystal SiC nanorods, the toughening filler used also includes fibrous whisker toughening filler one and fibrous whisker toughening filler two, and the length of fibrous whisker toughening filler one is greater than the length of fibrous whisker toughening filler two. Fiber-like whisker toughening filler one and fibrous whisker toughening filler two can be the same type of fibrous whisker toughening filler or different types of fibrous whisker toughening filler.

[0024] As shown above, by combining single-crystal SiC nanorods with other fibrous whisker toughening fillers, the crack resistance of the coating can be improved simultaneously through mechanisms such as the combination of crack resistance capabilities, differences in interfacial bonding strength, regulation of thermal expansion coefficients, and enhancement of interfacial effects.

[0025] In some embodiments, in addition to single-crystal SiC nanorods, the toughening filler may also include two or more other fibrous whisker toughening fillers. These fillers can be used in combination to prevent crack formation and further avoid performance degradation of individual materials. For example, some toughening fillers (such as boron carbide whiskers) are prone to failure in oxidizing environments, while mullite whiskers are stable at high temperatures. Using them in combination can prevent performance degradation of individual materials.

[0026] In some embodiments, the mass percentage of single-crystal SiC nanorods in the toughening filler can be controlled to be 5% to 100%. For example, the mass percentage of single-crystal SiC nanorods in the toughening filler can be controlled to be any value or a range of any two of the following: 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 70%, 75%, 80%, 90%, and 100%.

[0027] Of course, in some embodiments, two or more fibrous whisker toughening fillers other than single-crystal SiC nanorods can be used as toughening fillers in combination, and the crack resistance of the coating can be improved through a similar synergistic mechanism of different fibrous whisker toughening fillers. However, as mentioned above, single-crystal SiC nanorods, as toughening fillers, have key structural parameters such as aspect ratio and coefficient of thermal expansion that are more compatible with the coating system, resulting in a significant ability to prevent coating cracking. Furthermore, based on the synergistic mechanism of different fibrous whisker toughening fillers, the combination of two or more fibrous whisker toughening fillers containing single-crystal SiC nanorods provides a more significant improvement in the crack resistance of the coating.

[0028] As mentioned above, in the raw material component A of the ceramic coating composition, the toughening filler is a fibrous whisker toughening filler, which can deflect crack paths and prevent crack formation in the coating. The aspect ratio is the core parameter affecting the toughening effect of the fibrous whisker toughening filler, and it can dominate the crack deflection behavior through geometric constraints.

[0029] According to some embodiments of the present invention, the aspect ratio of the fibrous whisker toughening filler is (5-60):1. For example, the aspect ratio of the fibrous whisker toughening filler can be any value or a range of any two of the following: 5:1, 7:1, 10:1, 12:1, 15:1, 16:1, 18:1, 20:1, 23:1, 25:1, 28:1, 30:1, 34:1, 35:1, 37:1, 39:1, 40:1, 43:1, 45:1, 47:1, 50:1, 52:1, 55:1, 56:1, 58:1, 60:1. If the aspect ratio of the fibrous whisker toughening filler is too low, it is easy to result in a small deflection angle, low fracture energy consumption, insufficient bridging length, and low pull-out energy consumption; if the aspect ratio of the fibrous whisker toughening filler is too high, it is easy to break. By controlling the aspect ratio of the fibrous whisker toughening filler within the above range, it is beneficial to stabilize deflection cracks at large angles, effectively prevent coating fracture, and improve the coating's high-temperature resistance and corrosion resistance.

[0030] According to some embodiments of the present invention, the diameter of the fibrous whisker toughening filler is 1 μm to 10 μm. For example, the diameter of the fibrous whisker toughening filler can be any value or a range of any two of 1 μm, 1.5 μm, 2 μm, 2.5 μm, 3 μm, 5 μm, 6 μm, 6.5 μm, 7 μm, 8 μm, 9 μm, and 10 μm. If the diameter of the fibrous whisker toughening filler is too large, the whisker filler is too coarse, which on the one hand reduces the specific surface area and easily leads to a decrease in interfacial bonding force; on the other hand, it may increase the probability of its own defects, thus becoming a crack source. If the diameter of the fibrous whisker toughening filler is too small, quantum effects may occur, leading to abrupt changes in interfacial bonding (or modulus / hardness). As shown above, the diameter of the fibrous whisker toughening filler determines the interface effect and defect sensitivity to a certain extent. By controlling the diameter of the fibrous whisker toughening filler within the above range, a high specific surface area can be ensured, reducing the probability of its own defects and strengthening the transfer of interface loads. At the same time, the high load-bearing area is conducive to stress dispersion, thereby effectively preventing crack formation and improving high temperature resistance and corrosion resistance.

[0031] According to some embodiments of the present invention, the length of the fibrous whisker toughening filler is 10 μm to 60 μm. For example, the length of the fibrous whisker toughening filler can be any value or a range of any two of the following: 10 μm, 12 μm, 15 μm, 18 μm, 20 μm, 25 μm, 27 μm, 30 μm, 33 μm, 35 μm, 38 μm, 40 μm, 42 μm, 45 μm, 46 μm, 48 μm, 50 μm, 52 μm, 55 μm, 57 μm, and 60 μm. If the length of the fibrous whisker toughening filler is too short, it may not be able to cross the crack opening zone or the zone to be opened, resulting in failure of the bridging effect. Furthermore, the effects of high-temperature stress and crack path deflection are limited, resulting in low fracture energy consumption and low pull-out energy consumption. If the length of the fibrous whisker toughening filler is too long, it is difficult to disperse and is prone to forming stress concentration points in the coating, inducing new cracks. As shown above, the length of the fibrous whisker toughening filler can be controlled to match the crack size and dispersion feasibility. By controlling the length of the fibrous whisker toughening filler within the above range, it is beneficial to achieve uniform dispersion and effective bridging, deflect cracks, increase pull-out and fracture energy consumption, prevent coating fracture, and improve the high temperature resistance and corrosion resistance of the coating.

[0032] According to some embodiments of the present invention, the aspect ratio of the fibrous whisker toughening filler is (5-60):1; and the length is 10μm-60μm, or the diameter is 1μm-10μm. By controlling the aspect ratio, a core parameter affecting the toughening effect of the fibrous whisker toughening filler, and controlling its diameter or length, the crack-resistant capability can be effectively improved.

[0033] According to some embodiments of the present invention, the aspect ratio of the fibrous whisker toughening filler is (5-60):1, and the length is 10μm-60μm and the diameter is 1μm-10μm. By controlling the above parameters, the crack-resistant capacity can be maximized, preventing cracks in the coating and improving the high-temperature corrosion resistance of the coating.

[0034] According to some embodiments of the present invention, in the raw material components of composition A, the mass ratio of sol A to toughening filler is 1:(0.02 to 0.67). For example, the mass ratio of sol A to toughening filler in the raw material components of composition A can be any value or a range of any two of the following: 1:0.02, 1:0.03, 1:0.05, 1:0.067, 1:0.08, 1:0.09, 1:0.1, 1:0.2, 1:0.25, 1:0.3, 1:0.4, 1:0.45, 1:0.5, 1:0.55, 1:0.6, 1:0.65, 1:0.67. By controlling the amount of toughening filler within the above range, the toughening filler can effectively play its role, preventing the generation or propagation of coating cracks and improving the high-temperature corrosion resistance of the coating.

[0035] According to some embodiments of the present invention, sol A and / or sol B are independently selected from at least one of aluminum sol, silica sol, zirconium oxide sol, nickel oxide sol, and cerium oxide sol. The types of sol A in the raw material components of composition A and sol B in the raw material components of composition B may be the same or different.

[0036] According to some embodiments of the present invention, sol A and sol B are the same type of sol, which can improve the compatibility of composition B and composition A during coating application and improve the bonding strength of the coating.

[0037] According to some embodiments of the present invention, both sol A and sol B are selected from aluminum sol.

[0038] According to some embodiments of the present invention, in the raw material components of the composition B, the hardening filler is selected from at least one of mica, silica fume, zirconium oxide, alumina, calcium carbonate, barium sulfate, and talc.

[0039] According to some embodiments of the present invention, in the raw material components of composition B, the mass ratio of sol B to inorganic filler B is 1:(0.02 to 1.5). For example, the mass ratio of sol B to inorganic filler B in the raw material components of composition B can be any value or a range of any two of the following: 1:0.02, 1:0.03, 1:0.035, 1:0.05, 1:0.08, 1:0.1, 1:0.2, 1:0.4, 1:0.5, 1:0.6, 1:0.67, 1:0.8, 1:1, 1:1.2, 1:1.25, 1:1.3, 1:1.4, 1:1.5. By controlling the above dosage, the mechanical properties and adhesion properties of the coating constructed by the coating can be effectively guaranteed.

[0040] According to some embodiments of the present invention, the organosilicon ceramic precursor B is a silane.

[0041] According to some embodiments of the present invention, in the raw material components of the composition B, the organosilicon ceramic precursor B is selected from at least one of γ-aminopropyltriethoxysilane, hexadecyltriethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, trimethylchlorosilane, diphenyldimethoxysilane, and phenyltrimethoxysilane.

[0042] According to some embodiments of the present invention, in the raw material components of the composition B, the mass ratio of sol B to organosilicon ceramic precursor B is 1:(0.06 to 1.65). For example, the mass ratio of sol B to organosilicon ceramic precursor B in the raw material components of the composition B can be any value or a range of any two of the following: 1:0.06, 1:0.08, 1:0.1, 1:0.15, 1:0.2, 1:0.3, 1:0.35, 1:0.4, 1:0.5, 1:0.6, 1:0.66, 1:0.7, 1:0.8, 1:0.9, 1:1, 1:1.2, 1:1.25, 1:1.3, 1:1.4, 1:1.45, 1:1.5, 1:1.6, 1:1.65. By controlling the dosage as described above, it can be ensured that the organosilicon ceramic precursor B can form a hybrid network structure with the sol B in the composition B, and that there is also enough organosilicon ceramic precursor B and its hydrolysis products and other intermediate products to react with the remaining reactive sol A in the composition A to form a hybrid network structure, thus fully ensuring the mechanical properties and adhesion properties of the coating constructed by the coating.

[0043] According to some embodiments of the present invention, in the raw material components of composition B, catalyst B is selected from acidic catalysts or basic catalysts. In actual production, the specific type of catalyst B can be matched according to the selection of the sol.

[0044] According to some embodiments of the present invention, the acidic catalyst may be selected from at least one of hydrochloric acid, sulfuric acid, formic acid, acetic acid, and phosphoric acid, but the specific type of the catalyst may include, but is not limited to, the above substances.

[0045] According to some embodiments of the present invention, the alkaline catalyst may be selected from at least one of sodium hydroxide, potassium hydroxide, and ammonia water, and the specific type of the catalyst may include, but is not limited to, the above substances.

[0046] According to some embodiments of the present invention, in the raw material components of the composition B, the mass ratio of sol B to catalyst B is 1:(0.002 to 0.05). For example, the mass ratio of sol B to catalyst B in the raw material components of the composition B can be any value or a range of any two of the following: 1:0.002, 1:0.003, 1:0.005, 1:0.008, 1:0.01, 1:0.015, 1:0.02, 1:0.03, 1:0.035, 1:0.04, 1:0.045, 1:0.05.

[0047] According to some embodiments of the present invention, in the raw material components of the composition B, the mass ratio of the organosilicon ceramic precursor B to the catalyst B is 1:(0.003 to 0.34). For example, the mass ratio of the organosilicon ceramic precursor B to the catalyst B in the raw material components of the composition B can be any value or a range of any two of the following: 1:0.003, 1:0.005, 1:0.008, 1:0.01, 1:0.02, 1:0.027, 1:0.03, 1:0.05, 1:0.06, 1:0.075, 1:0.09, 1:0.1, 1:0.12, 1:0.15, 1:0.18, 1:0.2, 1:0.25, 1:0.3, 1:0.33, 1:0.34. By controlling the dosage as described above, it can be ensured that the organosilicon ceramic precursor B and its hydrolysis products in composition B can fully react with the sol under the action of catalyst B, thus ensuring the strength of the hybrid network structure and improving the density and high temperature resistance of the coating.

[0048] According to some embodiments of the present invention, the anti-corrosion filler is selected from at least one of zinc molybdate, zinc phosphate, aluminum tripolyphosphate, silicon phosphate, zinc borate, zinc powder, aluminum powder, mica, iron oxide, cerium oxide, zinc oxide, silica powder, zirconium oxide powder, talc powder, and wollastonite.

[0049] According to some embodiments of the present invention, the raw material components of composition A further include organosilicon ceramic precursor A and catalyst A.

[0050] By adding organosilicon ceramic precursor A and catalyst A to the raw material components of composition A, similar to composition B, under the action of catalyst A, organosilicon ceramic precursor A can react with part of sol A to construct a hybrid network structure and undergo partial gelation. This facilitates the uniform distribution of inorganic filler A, including toughening filler, in composition A, thereby improving the structural stability of the coating. When composition A is applied to the substrate surface, it can form a relatively stable base coating. Further application of composition B on top of this base coating allows unreacted organosilicon ceramic precursor B and its hydrolysis products, among other intermediates, to react with unreacted components in composition A under the action of the catalyst. The reaction of residual sol A enhances the hybrid network structure, improving the coating's density, bonding strength, and high-temperature resistance. On the other hand, based on the partial gelation of the primer in composition A and the bridging effect of its internal toughening filler, as well as the partial gelation of composition B, it is more conducive to the overall formation of a coating structure. The inorganic filler in composition A, including fibrous whisker toughening filler, is basically kept in the inner layer region close to the substrate, while the partially gelled composition B is more concentrated in the outer layer region of the coating, forming a surface barrier structure. Thus, through internal toughening and crack prevention and surface barrier, it can effectively prevent moisture penetration, improve the coating's high-temperature corrosion resistance, and at the same time ensure the coating's easy-to-clean performance.

[0051] According to some embodiments of the present invention, in the raw material components of composition A, the organosilicon ceramic precursor A is silane.

[0052] According to some embodiments of the present invention, the organosilicon ceramic precursor A is selected from at least one of γ-aminopropyltriethoxysilane, hexadecyltriethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, trimethylchlorosilane, diphenyldimethoxysilane, and phenyltrimethoxysilane.

[0053] According to some embodiments of the present invention, in the raw material components of composition A, catalyst A is selected from acidic catalysts or basic catalysts. In actual production, the specific type of catalyst A can be matched according to the selection of the sol.

[0054] According to some embodiments of the present invention, the acidic catalyst may be selected from at least one of hydrochloric acid, sulfuric acid, formic acid, acetic acid, and phosphoric acid, but the specific type of the catalyst may include, but is not limited to, the above substances.

[0055] According to some embodiments of the present invention, the alkaline catalyst may be selected from at least one of sodium hydroxide, potassium hydroxide, and ammonia water, and the specific type of the catalyst may include, but is not limited to, the above substances.

[0056] The organosilicon ceramic precursor A and catalyst A in the raw material components of composition A may be the same as, different from, or partially the same as, the organosilicon ceramic precursor B and catalyst B in the raw material components of composition B.

[0057] According to some embodiments of the present invention, in the raw material components of the composition A, the mass ratio of sol A to catalyst A is 1:(0.002 to 0.067). For example, the mass ratio of sol A to catalyst A can be any value or a range of any two of the following: 1:0.002, 1:0.003, 1:0.005, 1:0.0067, 1:0.008, 1:0.01, 1:0.015, 1:0.02, 1:0.03, 1:0.04, 1:0.05, 1:0.055, 1:0.06, 1:0.067.

[0058] According to some embodiments of the present invention, in the raw material components of the composition A, the mass ratio of the sol A to the organosilicon ceramic precursor A is 1:(0.02 to 1.34). For example, the mass ratio of sol A and organosilicon ceramic precursor A in the raw material components of composition A can be any value or a range of any two of the following: 1:0.02, 1:0.05, 1:0.06, 1:0.067, 1:0.08, 1:0.1, 1:0.2, 1:0.25, 1:0.28, 1:0.4, 1:0.5, 1:0.65, 1:0.7, 1:0.9, 1:1, 1:1.05, 1:1.1, 1:1.13, 1:1.15, 1:1.18, 1:1.2, 1:1.25, 1:1.28, 1:1.3, 1:1.32, 1:1.33, 1:1.34. By controlling the dosage as described above, it is possible to control the reaction of sol A with organosilicon ceramic precursor A to form a hybrid network structure, resulting in partial gelation. During the coating process, sol A can be firmly bonded to the substrate, improving the coating strength and its bonding strength with the substrate. Furthermore, there is still enough sol A remaining to react with the unreacted organosilicon ceramic precursor B and its intermediate products (such as hydrolysis products) in composition B to form a hybrid network structure, effectively enhancing the coating's density and high-temperature stability.

[0059] According to some embodiments of the present invention, in the raw material components of composition A, the mass ratio of the organosilicon ceramic precursor A to the catalyst A is 1:(0.005-1). For example, in the raw material components of composition A, the mass ratio of the organosilicon ceramic precursor A to the catalyst A can be any value or a range of any two of the following: 1:0.005, 1:0.008, 1:0.01, 1:0.02, 1:0.025, 1:0.04, 1:0.05, 1:0.06, 1:0.08, 1:0.1, 1:0.15, 1:0.2, 1:0.3, 1:0.45, 1:0.5, 1:0.6, 1:0.65, 1:0.7, 1:0.8, 1:0.9, 1:1.

[0060] According to some embodiments of the present invention, both the inorganic filler A and the inorganic filler B include the corrosion-resistant filler.

[0061] According to some embodiments of the present invention, the inorganic filler B includes the corrosion-resistant filler; further, the corrosion-resistant filler may be added only to the raw material components of composition B.

[0062] According to some embodiments of the present invention, the inorganic filler A includes the corrosion-resistant filler; further, the corrosion-resistant filler may be added only to the raw material components of composition A.

[0063] According to some embodiments of the present invention, in the raw material components of composition A, the inorganic filler A includes the anti-corrosion filler, and the mass ratio of sol A to the anti-corrosion filler in the raw material components of composition A is 1:(0.02~2.34); for example, the mass ratio of sol A to the anti-corrosion filler in the raw material components of composition A can be 1:0.02, 1:0.03, 1:0.05, 1:0.06, 1:0.067, 1:0.08, 1:0.1, 1:0.15, or 1:0.18. The range of any one of the following values, or any two of them: 1:0.2, 1:0.25, 1:0.3, 1:0.33, 1:0.35, 1:0.4, 1:0.5, 1:0.55, 1:0.6, 1:0.8, 1:1, 1:1.2, 1:1.25, 1:1.3, 1:1.45, 1:1.5, 1:1.65, 1:1.7, 1:1.8, 1:1.85, 1:1.9, 1:2, 1:2.1, 1:2.3, 1:2.3, 1:2.34.

[0064] According to some embodiments of the present invention, the raw material components of composition A and composition B do not contain solvents, and the method of using the ceramic coating includes: during construction, firstly, mixing the raw material components of composition A with a solvent to prepare coating slurry A, and then mixing the raw material components of composition B with a solvent to prepare coating slurry B; applying coating slurry A to the surface of the substrate to form a base layer, then applying coating slurry B on the base layer, and then performing a curing treatment to obtain the coating. The curing temperature can be controlled between 100℃ and 300℃, and the curing time can be controlled between 0.5h and 10h.

[0065] Similarly, if the raw material components of either composition A or composition B are solvent-free, the solvent-free composition can be mixed with a solvent to form a coating slurry during the application of the ceramic coating.

[0066] However, considering that existing oil-based coating technologies rely on organic solvents (such as xylene), which easily lead to high emissions of volatile organic compounds (VOCs), they generally do not meet environmental protection requirements. Therefore, according to some embodiments of the present invention, the ceramic coating is a water-based ceramic material; and / or, in the method of using the ceramic coating, the solvents used in the preparation of coating slurry A and coating slurry B are both water-based solvents. Thus, the ceramic coating is green and environmentally friendly, has high safety and reliability, and has extremely high practical application value.

[0067] According to some embodiments of the present invention, the ceramic coating satisfies at least one of the following conditions:

[0068] The raw material components of composition A also include aqueous solvent A;

[0069] The raw material components of composition B also include aqueous solvent B.

[0070] According to some embodiments of the present invention, the aqueous solvent A and / or the aqueous solvent B are independently selected from water or a combination of water and a water-soluble organic solvent. The water-soluble organic solvent may include, but is not limited to, alcohols (such as ethanol, isopropanol, n-butanol, propylene glycol, ethylene glycol, etc.) and alcohol ethers (such as propylene glycol methyl ether, propylene glycol butyl ether, etc.).

[0071] According to some embodiments of the present invention, composition A is prepared by mixing the raw material components of composition A, and composition B is prepared by mixing the raw material components of composition B; the method of using the ceramic coating may include: applying composition A to the surface of a substrate to form a primer; then applying composition B on the primer and performing a curing treatment to obtain the coating. For example, in some embodiments, both composition A and composition B of the ceramic coating contain aqueous solvents. During the application of the ceramic coating, composition A can be directly applied to the surface of the substrate to form a primer, and then composition B can be applied on the primer and cured to obtain the coating.

[0072] According to some embodiments of the present invention, the raw material components of the composition A include an aqueous solvent A, and the composition A is prepared by a method comprising the following steps: first, mixing and grinding the sol A, inorganic filler A (excluding toughening filler) and aqueous solvent A in the raw material components of the composition A, and then adding the remaining raw material components to obtain the composition A;

[0073] And / or, the raw material components of the composition B include an aqueous solvent B, and the composition B is prepared by a method comprising the following steps: mixing and grinding the sol B, inorganic filler B and aqueous solvent B in the raw material components of the composition B, and then adding the remaining raw material components, mixing and reacting to obtain the composition B.

[0074] The preparation process of the above compositions A and B involves grinding, which on the one hand can grind the inorganic fillers in the raw material components, except for the toughening fillers, to the target particle size (such as below 20 μm), ensuring that the particle size of the raw material components is uniform and meets the particle size requirements of ceramic coatings. On the other hand, the grinding process can assist in dispersion, which can help improve the dispersion uniformity of the raw material components, thereby improving the performance of ceramic coatings and the coatings constructed therefrom.

[0075] According to some embodiments of the present invention, the grinding process time is from 10 min to 300 min; for example, the grinding process time can be any value or a range of any two of the following: 10 min, 20 min, 25 min, 30 min, 45 min, 60 min, 90 min, 120 min, 180 min, 210 min, 240 min, 270 min, and 300 min. This control of the grinding process time ensures that the grinding effect is fully achieved.

[0076] In some embodiments, raw material components that meet the target particle size requirements can be selected when selecting raw material components. For example, the particle size of inorganic filler A and inorganic filler B, excluding toughening filler, can be controlled to be below 20 μm. Then, in the preparation process of composition A and composition B, dispersion can be assisted by grinding treatment, or the grinding treatment can be cancelled and the raw material components can be directly mixed and reacted.

[0077] According to some embodiments of the present invention, the particle size of inorganic filler A (excluding toughening filler) in the raw material components of composition A and / or inorganic filler B in the raw material components of composition B can be controlled to be below 20 μm. For example, the particle size of inorganic filler A (excluding toughening filler) and / or inorganic filler B can be any value or a range of any two of 0.1 μm, 0.2 μm, 0.5 μm, 1 μm, 2 μm, 5 μm, 6 μm, 8 μm, 10 μm, 11 μm, 12 μm, 12.5 μm, 13 μm, 15 μm, 16 μm, 18 μm, and 20 μm.

[0078] According to some embodiments of the present invention, the mixing reaction in the preparation process of composition B includes a hydrolysis reaction and a condensation reaction. The hydrolysis reaction includes the hydrolysis reaction of the organosilicon ceramic precursor B, that is, the organosilicon ceramic precursor B is hydrolyzed to generate silanol (Si-OH) under the catalysis of catalyst B. The condensation reaction includes the co-condensation reaction between the silanol Si-OH generated by the hydrolysis of organosilicon ceramic precursor B and sol B, such as the co-condensation reaction between the Si-OH generated by the hydrolysis of organosilicon ceramic precursor B and the Al-OH groups contained in the aluminum sol.

[0079] According to some embodiments of the present invention, the temperature of the mixing reaction is 20°C to 70°C. For example, the temperature of the mixing reaction can be any value or a range of any two of the following: 20°C, 22°C, 23°C, 25°C, 26°C, 28°C, 30°C, 32°C, 35°C, 40°C, 42°C, 45°C, 48°C, 50°C, 55°C, 57°C, 60°C, 62°C, 65°C, and 70°C.

[0080] According to some embodiments of the present invention, the mixing reaction time is 30 min to 360 min. For example, the mixing reaction time can be any value or a range of any two of the following: 30 min, 40 min, 45 min, 50 min, 60 min, 90 min, 120 min, 145 min, 150 min, 165 min, 180 min, 200 min, 210 min, 240 min, 275 min, 300 min, 320 min, and 360 min.

[0081] According to some embodiments of the present invention, the raw material components of composition A further contain an organosilicon ceramic precursor A and a catalyst A; composition A is prepared by a method comprising the following steps: first, sol A, inorganic filler A (excluding toughening filler), and aqueous solvent A in the raw material components of composition A are mixed and ground; then, the remaining raw material components are added, and a mixing reaction is carried out to obtain composition A. That is, in the preparation process of composition A, the remaining raw material components added contain an organosilicon ceramic precursor A and a catalyst A, and after the addition of the remaining raw material components, a mixing reaction similar to that of composition B needs to be further carried out to obtain composition A. The mixing reaction generally includes hydrolysis and condensation reactions; the temperature of the mixing reaction can be controlled between 20°C and 70°C, and the mixing reaction time can be controlled between 30 min and 360 min.

[0082] According to some embodiments of the present invention, the raw material components of composition A include sol A, inorganic filler A, aqueous solvent A, organosilicon ceramic precursor A, and catalyst A, wherein the inorganic filler A includes anti-corrosion filler and toughening filler; and the amount of toughening filler is 0.1% to 10% of the total mass of the raw material components of composition A. For example, the percentage of toughening filler in the total mass of the raw material components of composition A can be controlled to be any value or a range of any two of 0.1%, 0.15%, 0.2%, 0.3%, 0.45%, 0.5%, 0.6%, 0.65%, 0.7%, 0.8%, 0.9%, 1%, 2%, 2.5%, 3%, 4%, 4.5%, 5%, 6%, 6.5%, 7.5%, 8%, and 10%. By controlling the amount of toughening filler within the above range, the toughening filler can effectively play its role, prevent the generation or propagation of coating cracks, and improve the high-temperature corrosion resistance of the coating.

[0083] According to some embodiments of the present invention, the raw material components of the composition A include sol A, anti-corrosion filler, toughening filler, aqueous solvent A, organosilicon ceramic precursor A and catalyst A in a mass ratio of (15-50):(1-35):(1-10):(1-45):(1-20):(0.1-1);

[0084] And / or, the raw material components of the composition B include sol B, hardening filler, aqueous solvent B, organosilicon ceramic precursor B and catalyst B in a mass ratio of (20-50):(1-30):(1-45):(3-33):(0.1-1).

[0085] Alternatively, the raw material components of the composition A may include, by weight, 15 to 50 parts of sol A, 1 to 35 parts of anti-corrosion filler, 1 to 10 parts of toughening filler, 1 to 45 parts of aqueous solvent A, 1 to 20 parts of organosilicon ceramic precursor A, and 0.1 to 1 part of catalyst A.

[0086] Specifically, in the raw material components of composition A, the amount of sol A can be controlled to be any value or a range of any two of the following: 15 parts by weight, 17 parts by weight, 19 parts by weight, 20 parts by weight, 23 parts by weight, 25 parts by weight, 28 parts by weight, 30 parts by weight, 35 parts by weight, 40 parts by weight, 42 parts by weight, 45 parts by weight, and 50 parts by weight; the amount of anti-corrosion filler can be any value or a range of any two of the following: 1 part by weight, 2 parts by weight, 5 parts by weight, 8 parts by weight, 10 parts by weight, 12 parts by weight, 15 parts by weight, 16 parts by weight, 20 parts by weight, 23 parts by weight, 25 parts by weight, 28 parts by weight, 30 parts by weight, 32 parts by weight, and 35 parts by weight; the amount of toughening filler can be any value or a range of any two of the following: 1 part by weight, 2 parts by weight, 3 parts by weight, 4 parts by weight, 4.8 parts by weight, 5 parts by weight, 6.3 parts by weight, 7 parts by weight, 8 parts by weight, 9 parts by weight, and 10 parts by weight. The amounts of both can be within the range of 1 part by mass, 5 parts by mass, 10 parts by mass, 15 parts by mass, 18 parts by mass, 20 parts by mass, 25 parts by mass, 27 parts by mass, 29 parts by mass, 30 parts by mass, 31 parts by mass, 32 parts by mass, 35 parts by mass, 36 parts by mass, 37 parts by mass, 39 parts by mass, 40 parts by mass, 42 parts by mass, and 45 parts by mass, or any range of both. The amounts of organosilicon ceramic precursor A can be controlled to be within the range of 1 part by mass, 3 parts by mass, 5 parts by mass, 8 parts by mass, 10 parts by mass, 12 parts by mass, 15 parts by mass, 18 parts by mass, and 20 parts by mass, or any range of both. The amounts of catalyst A can be controlled to be within the range of 0.1 parts by mass, 0.2 parts by mass, 0.35 parts by mass, 0.5 parts by mass, 0.65 parts by mass, 0.7 parts by mass, 0.8 parts by mass, and 1 part by mass, or any range of both.

[0087] Similarly, the raw material components of the composition B may include 20 to 50 parts by weight of sol B, 1 to 30 parts by weight of hardening filler, 1 to 45 parts by weight of aqueous solvent B, 3 to 33 parts by weight of organosilicon ceramic precursor B, and 0.1 to 1 part by weight of catalyst B, based on parts by weight.

[0088] Specifically, in the raw material components of the composition B, the amount of sol B can be controlled to be any value or a range of any two of the following: 20 parts by mass, 22 parts by mass, 25 parts by mass, 28 parts by mass, 30 parts by mass, 34 parts by mass, 35 parts by mass, 37 parts by mass, 40 parts by mass, 42 parts by mass, 45 parts by mass, and 50 parts by mass; the amount of hardening filler can be any value or a range of any two of the following: 1 part by mass, 5 parts by mass, 10 parts by mass, 12 parts by mass, 15 parts by mass, 18 parts by mass, 20 parts by mass, 23 parts by mass, 25 parts by mass, 27 parts by mass, and 30 parts by mass; the amount of aqueous solvent B can be 1 part by mass, 5 parts by mass, 10 parts by mass, 12 parts by mass, 15 parts by mass, 16.5 parts by mass, 18 parts by mass, 19 parts by mass, 20 parts by mass, and 22 parts by mass. The amount of the organoceramic silicon precursor B can be any value or a range of any two of the following: 24 parts by mass, 25 parts by mass, 28 parts by mass, 30 parts by mass, 35 parts by mass, 36 parts by mass, 39 parts by mass, 40 parts by mass, and 45 parts by mass; the amount of the catalyst B can be any value or a range of any two of the following: 3 parts by mass, 5 parts by mass, 8 parts by mass, 10 parts by mass, 12 parts by mass, 15 parts by mass, 17 parts by mass, 20 parts by mass, 22 parts by mass, 25 parts by mass, 26 parts by mass, 28 parts by mass, 30 parts by mass, 32 parts by mass, and 33 parts by mass; the amount of the catalyst B can be any value or a range of any two of the following: 0.1 parts by mass, 0.2 parts by mass, 0.3 parts by mass, 0.5 parts by mass, 0.65 parts by mass, 0.7 parts by mass, 0.8 parts by mass, 0.9 parts by mass, and 1 part by mass.

[0089] By controlling the dosage of raw material components A and B in ceramic coatings, it is beneficial to ensure that the coating constructed by the ceramic coating has excellent mechanical properties, corrosion resistance, high temperature resistance and easy cleaning properties.

[0090] A second aspect of the invention provides a coating comprising a substrate and a coating formed on the surface of the substrate; the coating being made from any of the aforementioned ceramic coatings.

[0091] The technical solution of this invention regarding coated parts has at least the following beneficial effects:

[0092] The present invention relates to a coated component comprising a coating obtained from the aforementioned ceramic coating, thereby possessing all the beneficial effects of the ceramic coating. Specifically, the coating on the substrate surface of the coated component is obtained from the aforementioned ceramic coating. The ceramic coating contains a composition A, which is configured to be applied to the substrate surface to form a base coating. The sol A can form a good bond with the substrate. Furthermore, a toughening filler is added, specifically a fibrous whisker toughening filler, which can deflect high-temperature stress and crack paths. The deflected crack paths are significantly lengthened and tortuous, consuming more fracture energy. The crack generation on the constructed coating changes from a simple opening mode to a mixed mode (such as shear / tear / pull-out mode), significantly increasing the energy required for propagation. This improves the crack-resistance of the coating, preventing crack formation and propagation. Simultaneously, the fibrous whisker structure of the toughening filler can create a bridging effect, preventing or hindering crack formation. In the ceramic coating, the raw material component of composition B, which is configured to be applied to the base layer of composition A, contains organosilicon ceramic precursor B and sol B. Under the action of catalyst B, these components can react to construct a hybrid network structure and undergo partial gelation. Furthermore, after being applied to the base layer of composition A, the unreacted organosilicon ceramic precursor B and its intermediate products (such as hydrolysis products) in composition B can react with the unreacted sol A in composition A, further constructing and strengthening the hybrid network structure, thereby improving the coating's bonding strength, density, and high-temperature stability. Simultaneously, based on the composition... The toughening filler in composition A has a fibrous whisker structure and bridging effect, while composition B is partially gelled. The inorganic filler in composition A, including the fibrous whisker toughening filler, is primarily located in the inner layer region near the substrate, while the partially gelled composition B is concentrated in the outer layer region of the coating, forming a surface barrier. Thus, the coating as a whole forms an inner toughening and crack-resistant structure with a surface barrier. The inner layer structure near the substrate effectively toughens and prevents cracking, while the surface barrier layer ensures the coating's corrosion resistance and helps maintain a smooth surface, giving the coating excellent easy-to-clean properties. By using a ceramic coating containing both composition A and composition B to construct a coating on the substrate surface, the coating can achieve excellent easy-to-clean properties and significantly improve its high-temperature resistance, making it less prone to cracking at high temperatures. This ensures excellent corrosion resistance even at 400℃, resulting in coated parts with excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties.

[0093] According to some embodiments of the present invention, the coating is specifically prepared by first applying composition A to the surface of a substrate to form a base coating, then applying composition B on the base coating, and finally curing the coating.

[0094] According to some embodiments of the present invention, the substrate is selected from at least one of glass substrate, ceramic substrate, enamel substrate, and a composite substrate with a metal substrate or a metal substrate.

[0095] For example, metal substrates may include, but are not limited to, stainless steel (such as 310S, 316L) substrates, nickel-based alloys (such as Inconel 600, Inconel 718) substrates, etc.; glass substrates may include, but are not limited to, quartz glass substrates (SiO2 content ≥ 99.9%); ceramic substrates may include, but are not limited to, alumina ceramic substrates (Al2O3 content can be controlled at 95%~99%), silicon nitride ceramic substrates, etc.; enamel substrates may include, but are not limited to, steel plate enamel substrates, cast iron enamel substrates, etc. All of the above substrates can withstand temperatures above 400℃, and coated parts formed by constructing a coating on the surface of the above substrates using ceramic materials have excellent high-temperature corrosion resistance. In some embodiments, the substrate may also be low-carbon steel substrates, galvanized steel sheets, etc.

[0096] According to some embodiments of the present invention, the thickness of the coating is 15 μm to 100 μm. For example, the thickness of the coating can be controlled to be any value or a range of any two of the following: 15 μm, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 62 μm, 65 μm, 68 μm, 70 μm, 75 μm, 78 μm, 80 μm, 83 μm, 85 μm, 90 μm, 95 μm, and 100 μm.

[0097] A third aspect of the present invention provides a method for preparing the aforementioned coated part, comprising the following steps:

[0098] Composition A of the ceramic coating is applied to the surface of the substrate to form a base coat; then composition B of the ceramic coating is applied to the base coat; and then a curing process is performed.

[0099] The technical solution of the coating preparation method of the present invention has at least the following beneficial effects:

[0100] The method for preparing the coated part of the present invention uses the aforementioned ceramic coating to construct a coating on the surface of a substrate, thereby possessing all the beneficial effects of the ceramic coating. Specifically, in the preparation process of the coated part, composition A of the ceramic coating is first applied to the surface of the substrate to form a base layer, and then composition B is applied on the base layer, followed by curing to obtain a coating on the surface of the substrate. The sol A in the raw material components of composition A can form a good bond with the substrate; and toughening filler is also added, specifically fibrous whisker toughening filler, which can deflect high-temperature stress and crack paths. The deflected crack paths are significantly lengthened and tortuous, consuming more fracture energy. Furthermore, the crack generation on the constructed coating changes from a simple opening mode to a mixed mode (such as shear / tear / pull-out mode), significantly increasing the energy required for propagation, thereby improving the crack resistance of the coating and preventing crack formation and propagation. Simultaneously, the fibrous whisker structure of the toughening filler can be used to create a bridging effect, preventing or hindering crack formation. In the raw material components of composition B, the organosilicon ceramic precursor B and sol B can react under the action of catalyst B to construct a hybrid network structure and undergo partial gelation. After being applied to the base coating of composition A, the unreacted organosilicon ceramic precursor B and its intermediate products (such as hydrolysis products) in composition B can react with the unreacted sol A in composition A to further construct and enhance the hybrid network structure, thereby improving the coating's bonding strength, density, and high-temperature stability. At the same time, based on the fibrous whisker structure and bridging effect of the toughening filler in composition A and the partial gelation of composition B, the overall coating forms a structure in which the inorganic filler, including the fibrous whisker toughening filler in composition A, is basically maintained in the inner layer region close to the substrate, while the partially gelled composition B is more concentrated in the outer layer region of the coating, forming a surface barrier structure. The inner layer structure close to the substrate can effectively toughen and prevent cracking, while the surface barrier layer can ensure the corrosion resistance of the coating and help maintain a smooth surface, giving the coating excellent easy-to-clean properties. By combining composition A and composition B, the coating constructed on the substrate surface can exhibit excellent easy-to-clean properties, while significantly improving the high-temperature resistance of the coating on the substrate surface, thus ensuring that the coating still maintains excellent corrosion resistance at 400℃. Therefore, the coated part prepared using the above method possesses excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties.

[0101] According to some embodiments of the present invention, the curing temperature is 100°C to 300°C. For example, the curing temperature may be any value or a range of any two of the following: 100°C, 110°C, 120°C, 125°C, 130°C, 145°C, 150°C, 170°C, 180°C, 200°C, 210°C, 220°C, 240°C, 250°C, 260°C, 265°C, 270°C, 280°C, 290°C, and 300°C.

[0102] According to some embodiments of the present invention, the curing time is 0.5h to 10h. For example, the curing time can be any value or a range of any two of 0.5h, 0.8h, 1h, 1.5h, 2h, 3h, 3.5h, 4h, 5h, 5.5h, 6h, 6.5h, 7h, 8h, 9h, and 10h.

[0103] As mentioned above, in some embodiments, the raw material components of ceramic coating composition A and composition B contain aqueous solvents. For example, in some embodiments, the raw material component of composition A contains aqueous solvent A, and the raw material component of composition B contains aqueous solvent B. Therefore, composition A and composition B can generally be directly used as coating slurries for application. However, in some embodiments, the raw material components of ceramic coating composition A and / or composition B do not contain solvents. Therefore, during application, composition A and / or composition B generally need to be mixed with solvents to prepare a coating slurry before application.

[0104] According to some embodiments of the present invention, the step of applying composition A in a ceramic coating to the surface of a substrate to form a base coating comprises: first mixing composition A in the ceramic coating with an aqueous solvent to prepare a coating slurry A, and then applying the coating slurry A to the surface of the substrate to form a base coating. Particularly for cases where the raw material components of composition A do not contain an aqueous solvent, it is necessary to first mix composition A with an aqueous solvent to prepare a coating slurry.

[0105] According to some embodiments of the present invention, the step of mixing composition A in the ceramic coating with an aqueous solvent to prepare coating slurry A may specifically include: mixing sol A and inorganic filler A (excluding toughening filler) from the raw material components of composition A with an aqueous solvent and grinding them, and then adding the remaining raw material components to obtain coating slurry A. The grinding time may be from 10 min to 300 min.

[0106] According to some embodiments of the present invention, the raw material components of the composition A contain an organosilicon ceramic precursor A and a catalyst A; the step of mixing the composition A in the ceramic coating with an aqueous solvent to prepare a coating slurry A specifically includes: first mixing the sol A and the inorganic filler A (excluding the toughening filler) in the raw material components of the composition A with an aqueous solvent and grinding them, and then adding the remaining raw material components, mixing and reacting to obtain the coating slurry A.

[0107] According to some embodiments of the present invention, during the preparation of the coating slurry A, the mixing reaction time can be 20°C to 70°C; the mixing reaction time can be 30 min to 360 min; the mixing reaction generally includes hydrolysis reaction and condensation reaction.

[0108] According to some embodiments of the present invention, applying composition B of the ceramic coating to the base layer comprises: first mixing composition B of the ceramic coating with an aqueous solvent to prepare a coating slurry B, and then applying the coating slurry B to the base layer. Particularly for cases where the raw material components of composition B do not contain an aqueous solvent, it is necessary to first mix composition B with an aqueous solvent to prepare a coating slurry.

[0109] According to some embodiments of the present invention, the step of mixing composition B in the ceramic coating with an aqueous solvent to prepare coating slurry B specifically includes: mixing sol B and inorganic filler B from the raw material components of composition B with an aqueous solvent and grinding them, then adding the remaining raw material components and mixing and reacting to obtain coating slurry B. The grinding time can be 10 min to 300 min; the mixing reaction time can be 20°C to 70°C; the mixing reaction time can be 30 min to 360 min; the mixing reaction generally includes hydrolysis and condensation reactions.

[0110] According to some embodiments of the present invention, the substrate may be sandblasted before the composition A in the ceramic coating is applied to the surface of the substrate to form a base coating.

[0111] The aforementioned ceramic coatings or coatings of this invention can be applied to the field of household appliances. Because the coatings constructed with the ceramic coatings of this invention and the coatings of this invention possess excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties, their application in the field of household appliances allows the corresponding downstream products using these ceramic coatings or coatings to also possess at least all the beneficial effects corresponding to the aforementioned ceramic coatings or coatings, exhibiting excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties.

[0112] According to some embodiments of the present invention, the ceramic coating or coating part can be specifically applied to high-temperature environments in the field of household appliances. Specifically, the high-temperature environment can be a high-temperature environment above 400°C, that is, the ambient temperature can reach 400°C or even higher than 400°C. For example, the high-temperature ambient temperature can be any value or a range of any two of the following temperatures: 400°C, 410°C, 420°C, 450°C, 460°C, 480°C, 500°C, 520°C, 530°C, 550°C, 560°C, 570°C, 580°C, 590°C, and 600°C.

[0113] Of course, it is understandable that, based on the above-mentioned application of ceramic coatings or coated parts in high-temperature environments above 400℃ in the field of household appliances, they can also be applied in application scenarios below 400℃ in the field of household appliances. Here, "below 400℃" can be any value or a range of any two of the following: 25℃, 45℃, 60℃, 80℃, 100℃, 150℃, 180℃, 200℃, 250℃, 280℃, 290℃, 300℃, 320℃, 330℃, 350℃, 360℃, 380℃, and 400℃. Based on the above, the above ceramic coatings or coated parts can be applied to household appliances in scenarios where the temperature is either below 400℃ or above 400℃, or any combination of both. For example, the ambient temperature can be any value or any combination of both of the following: 150℃, 180℃, 200℃, 250℃, 280℃, 290℃, 300℃, 320℃, 350℃, 360℃, 380℃, 400℃, 420℃, 450℃, 460℃, 480℃, 500℃, 530℃, 550℃, 560℃, 580℃, 600℃.

[0114] In a fourth aspect, the present invention provides a household appliance comprising any of the aforementioned coated parts.

[0115] The household appliances of the present invention contain the coating of the present invention, which has excellent high temperature resistance, corrosion resistance and easy cleaning performance. Therefore, the household appliances also have at least all the excellent effects of the aforementioned coating, which will not be elaborated further.

[0116] According to some embodiments of the present invention, the household appliance may be at least one of the following: oven, microwave oven, air fryer, rice cooker, pressure cooker, disinfection cabinet, steam oven, range hood, stove, dishwasher, air conditioner, and water heater. Attached Figure Description

[0117] Figure 1 This is a scanning electron microscope (SEM) image of the single-crystal SiC nanorods used in Example 1;

[0118] Figure 2 These are SEM images of magnesium borate whiskers used in Example 1 at different magnifications;

[0119] Figure 3 This is a scanning electron microscope (SEM) image of the carbon nanotube whiskers used in Example 1;

[0120] Figure 4 This is a scanning electron microscope (SEM) image of the magnesium oxide whiskers used in Example 2;

[0121] Figure 5 This is a SEM image of the zinc oxide whiskers used in Example 3;

[0122] Figure 6 This is a scanning electron microscope (SEM) image of the granular polycrystalline silicon carbide used in Comparative Example 3.

[0123] Figure 7 This is a graph showing the contact angle test results of the coating on the coated part in Example 15;

[0124] Figure 8 This is a comparison image of the coated surface of the workpiece in Example 15 before and after the removal of the cured egg white;

[0125] Figure 9 This is a scanning electron microscope (SEM) image of the coating surface of the coated part in Example 15 after being subjected to constant temperature heat treatment at 400°C for 80 hours.

[0126] Figure 10 This is a scanning electron microscope (SEM) image of the coating surface of the coated part in Comparative Example 4 after being subjected to a constant temperature heat treatment at 400℃ for 80 hours.

[0127] Figure 11 The images show the surface corrosion of the coated parts of Example 15 and Comparative Example 4 after being subjected to constant temperature heat treatment at 400℃ for 80 hours and then placed in a neutral salt spray chamber for 200 hours and 24 hours, respectively. Detailed Implementation

[0128] The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described in conjunction with the embodiments, but the present invention is not limited to these embodiments.

[0129] The following will describe the concept and technical effects of the present invention clearly and completely with reference to embodiments, so as to fully understand the purpose, features and effects of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention.

[0130] Example 1

[0131] This embodiment provides a ceramic coating, which is a water-based ceramic coating, comprising composition A and composition B.

[0132] The raw material components of composition A, by mass percentage, include: 35% aluminum sol (particle size 50 nm), 15% mica powder (800 mesh, i.e., particle size approximately 15 μm), 30.8% solvent water, 0.5% single-crystal SiC nanorods, 8% magnesium borate whiskers (diameter 1 μm–2 μm), 0.5% carbon nanotube whiskers, 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia. Mica powder serves as an anti-corrosion filler, while single-crystal SiC nanorods, magnesium borate whiskers, and carbon nanotube whiskers are all toughening fillers. γ-aminopropyltriethoxysilane is a precursor for organosilicon ceramics, and ammonia is a catalyst.

[0133] The single-crystal SiC nanorods, magnesium borate whiskers, and carbon nanotube whiskers used in this embodiment were all purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., and their SEM images are shown below. Figures 1-3 As shown; Figure 1 As shown, the single-crystal SiC nanorods used in this embodiment are fibrous, with a uniform aspect ratio, and satisfying an aspect ratio of (5-60):1, a length of 10μm-60μm, and a diameter of 1μm-10μm; Figure 2 As shown, the magnesium borate whiskers used in this embodiment have relatively poor uniformity, and the content of magnesium borate whiskers with lengths ranging from 10µm to 60µm is low; for example... Figure 3 As shown, the carbon nanotube whiskers used in this embodiment have a smaller diameter and a longer length.

[0134] The raw material components of composition B, by mass percentage, include: 30% aluminum sol, 20% alumina powder, 19.2% solvent water, 30% methyltriethoxysilane, and 0.8% ammonia. Alumina powder serves as a hardening filler, methyltriethoxysilane as a precursor for organosilicon ceramics, and ammonia as a catalyst.

[0135] The above ceramic coatings can be prepared by the following methods:

[0136] The preparation of composition A includes: taking the raw material components of composition A according to the above dosage; mixing and ball milling the aluminum sol, mica powder and solvent water in the raw material components of composition A, adding single crystal SiC nanorods, magnesium borate whiskers and carbon nanotube whiskers and stirring evenly, then adding γ-aminopropyltriethoxysilane and ammonia water, reacting at room temperature for 3 hours to obtain composition A.

[0137] The preparation of composition B includes: taking the raw material components of composition B according to the above dosage; mixing and ball milling the aluminum sol, alumina powder and solvent water in the raw material components of composition B, and then adding methyltriethoxysilane and ammonia water, reacting at room temperature for 2 hours to obtain composition B.

[0138] When applying the above ceramic coatings, the following method can be used: First, sandblast the substrate; then spray composition A onto the surface of the substrate to form a primer, followed by spraying composition B onto the surface of the primer facing away from the substrate, and then perform a curing process. The curing process may include curing at 300°C for 1 hour.

[0139] In other embodiments, the raw material components of composition A and composition B in the above ceramic coating may also be free of solvent water. When applying or constructing coated parts, composition A and composition B are first mixed with solvent water (or other water-based solvents) to prepare a coating slurry, which is then sprayed onto the surface of the substrate in sequence and then cured.

[0140] Example 2

[0141] This embodiment provides a ceramic coating, which is a water-based ceramic coating, comprising composition A and composition B.

[0142] The raw material components of composition A, by mass percentage, include: 28% aluminum sol (particle size 50 nm), 12% silica powder (1200 mesh, i.e., particle size approximately 10 μm), 35.3% solvent water, 1% single-crystal SiC nanorods, 5% magnesium oxide whiskers (diameter 1 μm–5 μm), 18% phenyltrimethoxysilane, and 0.7% formic acid. The silica powder serves as an anti-corrosion filler; the single-crystal SiC nanorods and magnesium oxide whiskers serve as toughening fillers. Specifically, the single-crystal SiC nanorods used are the same as those used in Example 1, and the magnesium oxide whiskers were also purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., and their SEM images are shown below. Figure 4 As shown, its diameter is relatively large; phenyltrimethoxysilane is the precursor of organosilicon ceramics, and formic acid is the catalyst.

[0143] The raw material components of composition B, by mass percentage, include: 50% aluminum sol, 25% talc, 16.5% water solvent, 8% dimethyldimethoxysilane, and 0.5% formic acid. Talc serves as a hardening filler, dimethyldimethoxysilane as a precursor for organosilicon ceramics, and formic acid as a catalyst.

[0144] The above ceramic materials can be prepared by the following methods:

[0145] The preparation of composition A includes: taking the raw material components of composition A according to the above dosage; mixing and ball milling the aluminum sol, silicon micro powder and solvent water in the raw material components of composition A, adding single crystal SiC nanorods and magnesium oxide whiskers and stirring evenly, then adding phenyltrimethoxysilane and formic acid, reacting at 70°C for 4 hours to obtain composition A.

[0146] The preparation of composition B includes: preparing the raw material components of composition B according to the above dosage; mixing and ball milling the aluminum sol, talc powder and solvent water in the raw material components of composition B, and then adding dimethyldimethoxysilane and formic acid, reacting at 35°C for 6 hours to obtain composition B.

[0147] When applying the above ceramic coatings, the following method can be used: First, sandblast the substrate; then spray composition A onto the surface of the substrate to form a primer layer, followed by spraying composition B onto the surface of the primer layer facing away from the substrate, and then perform a curing process. The curing process may include curing at 200°C for 3 hours.

[0148] In other embodiments, the raw material components of composition A and composition B in the ceramic coating may also be free of solvent water. When applying or constructing the coated part, composition A and composition B are first mixed with solvent water (or other aqueous solvent) to prepare a coating slurry, which is then sprayed onto the surface of the substrate in sequence and then cured.

[0149] Example 3

[0150] This embodiment provides a ceramic coating, which is a water-based ceramic coating, comprising composition A and composition B.

[0151] The raw material components of composition A, by mass percentage, include: 45% aluminum sol (particle size 50 nm), 8% zirconium oxide powder (1000 mesh, i.e., particle size approximately 13 μm), 37.5% solvent water, 2% single-crystal SiC nanorods, 2% zinc oxide whiskers (diameter 0.7 μm–1.4 μm), 5% vinyltrimethoxysilane, and 0.5% acetic acid. Zirconia powder is used as an anti-corrosion filler; single-crystal SiC nanorods and zinc oxide whiskers are used as toughening fillers. Specifically, the single-crystal SiC nanorods used are the same as those used in Example 1, and the zinc oxide whiskers were also purchased from Shanghai Aladdin Biochemical Technology Co., Ltd., and their SEM images are shown below. Figure 5 As shown, its diameter is relatively long; vinyltrimethoxysilane is the precursor of organosilicon ceramics, and acetic acid is the catalyst.

[0152] The raw material components of composition B, by mass percentage, include: 25% aluminum sol, 25% mica powder, 24.8% water solvent, 25% trimethylchlorosilane, and 0.2% acetic acid. Mica powder serves as a hardening filler, trimethylchlorosilane as a precursor for organosilicon ceramics, and acetic acid as a catalyst.

[0153] The above ceramic materials can be prepared by the following methods:

[0154] The preparation of composition A includes: taking the raw material components of composition A according to the above dosage; mixing and ball milling the aluminum sol, zirconium oxide powder and solvent water in the raw material components of composition A, adding single crystal SiC nanorods and zinc oxide whiskers and stirring evenly, then adding vinyltrimethoxysilane and acetic acid, reacting at 40°C for 5 hours to obtain composition A.

[0155] The preparation of composition B includes: taking the raw material components of composition B according to the above dosage; mixing and ball milling the aluminum sol, mica powder and solvent water in the raw material components of composition B, and then adding trimethylchlorosilane and acetic acid, reacting at 60°C for 1 hour to obtain composition B.

[0156] When applying the above ceramic coatings, the following method can be used: First, sandblast the substrate; then spray composition A onto the surface of the substrate to form a primer, and then spray composition B onto the surface of the primer facing away from the substrate, followed by curing. The curing process may include curing at 180°C for 6 hours.

[0157] In other embodiments, the raw material components of composition A and composition B in the above ceramic coating may also be free of solvent water. When applying or constructing coated parts, composition A and composition B are first mixed with solvent water (or other water-based solvents) to prepare a coating slurry, which is then sprayed onto the surface of the substrate in sequence and then cured.

[0158] Example 4

[0159] This embodiment provides a ceramic coating, which is a water-based ceramic coating, comprising composition A and composition B.

[0160] The raw material components of composition A, by mass percentage, include: 15% aluminum sol (particle size 50 nm), 35% talc (800 mesh, i.e., particle size approximately 15 μm), 29.9% solvent water, 2% single-crystal SiC nanorods, 8% magnesium oxide whiskers (diameter 2 μm–10 μm), 10% γ-aminopropyltriethoxysilane, and 0.1% sodium hydroxide. Talc is used as an anti-corrosion filler, and the single-crystal SiC nanorods and magnesium oxide whiskers are used as toughening fillers. Specifically, the single-crystal SiC nanorods and magnesium oxide whiskers used are the same as those used in Example 2. γ-aminopropyltriethoxysilane is a precursor for organosilicon ceramics, and sodium hydroxide is a catalyst.

[0161] The raw material components of composition B, by mass percentage, include: 30% aluminum sol, 18% silica powder, 39.9% water solvent, 12% hexadecyltriethoxysilane, and 0.1% sodium hydroxide. Silica powder serves as a hardening filler, hexadecyltriethoxysilane as a precursor for organosilicon ceramics, and sodium hydroxide as a catalyst.

[0162] The above ceramic materials can be prepared by the following methods:

[0163] The preparation of composition A includes: taking the raw material components of composition A according to the above dosage; mixing and ball milling the aluminum sol, talc powder and solvent water in the raw material components of composition A, adding single crystal SiC nanorods and magnesium oxide whiskers and stirring evenly, then adding γ-aminopropyltriethoxysilane and sodium hydroxide, reacting at 60°C for 3 hours to obtain composition A.

[0164] The preparation of composition B includes: preparing the raw material components of composition B according to the above dosage; mixing and ball milling the aluminum sol, silica powder and solvent water in the raw material components of composition B, and then adding hexadecyltriethoxysilane and sodium hydroxide, reacting at 40°C for 8 hours to obtain composition B.

[0165] When applying the above ceramic coatings, the following method can be used: First, sandblast the substrate; then spray composition A onto the surface of the substrate to form a primer, and then spray composition B onto the surface of the primer facing away from the substrate, followed by curing. The curing process may include curing at 150°C for 1 hour, followed by curing at 300°C for 2 hours.

[0166] In other embodiments, the raw material components of composition A and composition B in the above ceramic coating may also be free of solvent water. When applying or constructing coated parts, composition A and composition B are first mixed with solvent water (or other water-based solvents) to prepare a coating slurry, which is then sprayed onto the surface of the substrate in sequence and then cured.

[0167] Example 5

[0168] This embodiment provides a ceramic coating, which differs from Embodiment 1 in that: in this embodiment, the magnesium borate whiskers and carbon nanotube whiskers in the original components of composition A are replaced with an equal amount of single-crystal SiC nanorods, and the toughening filler contains only single-crystal SiC nanorods. Specifically, the single-crystal SiC nanorods used are the same as those used in Embodiment 1; everything else is the same as in Embodiment 1.

[0169] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 9% single crystal SiC nanorods, 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0170] Example 6

[0171] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this ceramic coating and the ceramic coating of Example 1 is that: in this embodiment, the single-crystal SiC nanorods and magnesium borate whiskers in the raw material components of composition A of the ceramic coating of Example 1 are replaced with an equal amount of carbon nanotube whiskers. Furthermore, the toughening filler in composition A uses only carbon nanotube whiskers. Specifically, the carbon nanotube whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0172] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 9% carbon nanotube whiskers, 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0173] Example 7

[0174] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this ceramic coating and the ceramic coating of Example 1 is that: in this embodiment, the single-crystal SiC nanorods and magnesium borate whiskers in the raw material components of composition A of the ceramic coating of Example 1 are replaced with an equal amount of magnesium borate whiskers. Furthermore, the toughening filler in composition A uses only magnesium borate whiskers, and the magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0175] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 9% magnesium borate whiskers (diameter of 1 μm to 2 μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0176] Example 8

[0177] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use carbon nanotube whiskers and magnesium borate whiskers in a mass ratio of 1:4. Specifically, the carbon nanotube whiskers and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0178] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size 50nm), 15% mica powder (800 mesh, i.e., particle size approximately 15μm), 30.8% solvent water, 1.8% carbon nanotube whiskers, 7.2% magnesium borate whiskers (diameter 1μm~2μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0179] Example 9

[0180] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use single-crystal SiC nanorods and magnesium borate whiskers with a mass ratio of 1:9. Specifically, the single-crystal SiC nanorods and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0181] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 0.9% single crystal SiC nanorods, 8.1% magnesium borate whiskers (diameter of 1 μm to 2 μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0182] Example 10

[0183] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use single-crystal SiC nanorods and magnesium borate whiskers with a mass ratio of 1:4. Specifically, the single-crystal SiC nanorods and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0184] Specifically, the raw material components of composition A in the ceramic coating of this embodiment, by mass percentage, include: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 1.8% single crystal SiC nanorods, 7.2% magnesium borate whiskers (diameter of 1 μm to 2 μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0185] Example 11

[0186] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use single-crystal SiC nanorods and magnesium borate whiskers with a mass ratio of 2:3. Specifically, the single-crystal SiC nanorods and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0187] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size 50nm), 15% mica powder (800 mesh, i.e., particle size about 15μm), 30.8% solvent water, 3.6% single crystal SiC nanorods, 5.4% magnesium borate whiskers (diameter 1μm to 2μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0188] Example 12

[0189] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use single-crystal SiC nanorods and magnesium borate whiskers with a mass ratio of 3:2. Specifically, the single-crystal SiC nanorods and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0190] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 5.4% single crystal SiC nanorods, 3.6% magnesium borate whiskers (diameter of 1 μm to 2 μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0191] Example 13

[0192] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use single-crystal SiC nanorods and magnesium borate whiskers with a mass ratio of 4:1. Specifically, the single-crystal SiC nanorods and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0193] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 7.2% single crystal SiC nanorods, 1.8% magnesium borate whiskers (diameter of 1 μm to 2 μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0194] Example 14

[0195] This embodiment provides a ceramic coating, which is a water-based ceramic coating. The difference between this embodiment and the ceramic coating of Example 1 is that, while keeping the total amount of toughening filler (9%) in the raw material component A of the ceramic coating of Example 1 unchanged, the toughening filler is adjusted to use single-crystal SiC nanorods and magnesium borate whiskers with a mass ratio of 9:1. Specifically, the single-crystal SiC nanorods and magnesium borate whiskers used are the same as those used in Example 1; everything else is the same as in Example 1.

[0196] Specifically, the raw material components of composition A in the ceramic coating of this embodiment include, by mass percentage: 35% aluminum sol (particle size of 50 nm), 15% mica powder (800 mesh, i.e., particle size of about 15 μm), 30.8% solvent water, 8.1% single crystal SiC nanorods, 0.9% magnesium borate whiskers (diameter of 1 μm to 2 μm), 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0197] Comparative Example 1

[0198] This comparative example provides a water-based ceramic coating, comprising composition A and composition B. The difference between this composition and the ceramic coating of Example 1 is that composition A of this comparative example does not contain the toughening fillers single-crystal SiC nanorods, magnesium borate whiskers, and carbon nanotube whiskers; instead, it uses water as a solvent in the same amount as the toughening fillers in Example 1. The other raw material components are configured the same as in Example 1. Correspondingly, the preparation process of the ceramic coating is the same as in Example 1, except that the addition of the toughening fillers single-crystal SiC nanorods, magnesium borate whiskers, and carbon nanotube whiskers is omitted in the preparation of composition A.

[0199] Specifically, the raw material components of composition A, by mass percentage, include: 35% aluminum sol (particle size 50 nm), 15% mica powder (800 mesh, i.e., particle size approximately 15 μm), 39.8% solvent water, 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0200] Correspondingly, in the preparation method of the comparative ceramic coating, the preparation of composition A includes: preparing the raw material components of composition A according to the above dosage; mixing and ball milling the aluminum sol, mica powder and solvent water in the raw material components of composition A for 2 hours, and then adding γ-aminopropyltriethoxysilane and ammonia water, reacting at room temperature for 3 hours to obtain composition A.

[0201] In addition, the raw material composition configuration and specific preparation of composition B in this comparative example, as well as the coating application method of the ceramic coating, are the same as in Example 1.

[0202] Comparative Example 2

[0203] This comparative example provides a ceramic coating, which is a water-based ceramic coating. The difference between this ceramic coating and the ceramic coating of Example 1 is that this comparative example ceramic coating contains only composition A and does not contain composition B; the raw material components and preparation method of composition A are the same as those of composition A in Example 1.

[0204] When applying the above ceramic coatings, the following method can be used: first, sandblast the substrate; then spray composition A onto the surface of the substrate to form a primer layer, followed by curing. The curing process may include curing at 300°C for 1 hour.

[0205] Comparative Example 3

[0206] This comparative example provides a water-based ceramic coating, which differs from the ceramic coating of Example 1 in that: in this comparative example, the toughening fillers single-crystal SiC nanorods, magnesium borate whiskers, and carbon nanotube whiskers in the raw material component A of the ceramic coating of Example 1 are replaced with an equal amount of granular polycrystalline silicon carbide. Furthermore, the toughening filler in this comparative example contains only granular polycrystalline silicon carbide. The granular polycrystalline silicon carbide used in this comparative example was purchased from Shanghai McLean Biochemical Technology Co., Ltd., and its SEM image is shown below. Figure 6 As shown; everything else is the same as in Example 1.

[0207] Specifically, the raw material components of composition A in this comparative ceramic coating, by mass percentage, include: 35% aluminum sol (particle size 50 nm), 15% mica powder (800 mesh, i.e., particle size approximately 15 μm), 30.8% solvent water, 9% particulate polycrystalline silicon carbide, 10% γ-aminopropyltriethoxysilane, and 0.2% ammonia water.

[0208] Example 15

[0209] This embodiment provides a coated part, which can be prepared by using the ceramic coating of Example 1 and by preparing a coating on the surface of a substrate according to the coating application method in Example 1. The specific preparation method includes:

[0210] The ceramic coating of Example 1 was first sandblasted onto a low-carbon steel substrate. Then, the ceramic coating composition A was sprayed onto the surface of the low-carbon steel substrate to form a base layer. Next, the ceramic coating composition B was sprayed onto the base layer. Finally, the coating was cured at 300°C for 1 hour to obtain the coated part.

[0211] The coated part obtained above includes a substrate and a coating on the surface of the substrate. The substrate is a low carbon steel substrate, and the coating is made from the ceramic coating of Example 1. The thickness of the coating is 50 μm.

[0212] Example 16

[0213] This embodiment provides a coated part, which can be prepared by using the ceramic coating of Example 2 and by preparing a coating on the surface of a substrate according to the coating application method in Example 2. The specific preparation method includes:

[0214] The ceramic coating of Example 2 was first sandblasted onto a low-carbon steel substrate. Then, the ceramic coating composition A was sprayed onto the surface of the low-carbon steel substrate to form a base layer. Next, the ceramic coating composition B was sprayed onto the base layer. Finally, the coating was cured at 200°C for 3 hours to obtain the coated part.

[0215] The coated part obtained above includes a substrate and a coating on the surface of the substrate. The substrate is a low carbon steel substrate, and the coating is made from the ceramic coating of Example 2. The thickness of the coating is 60 μm.

[0216] Example 17

[0217] This embodiment provides a coated part, which can be prepared by using the ceramic coating of Example 3 and by preparing a coating on the surface of a substrate according to the coating application method in Example 3. The specific preparation method includes:

[0218] The ceramic coating of Example 3 was first sandblasted onto a low-carbon steel substrate. Then, the ceramic coating composition A was sprayed onto the surface of the low-carbon steel substrate to form a base layer. Next, the ceramic coating composition B was sprayed onto the base layer. Finally, the coating was cured at 180°C for 6 hours to obtain the coated part.

[0219] The coated parts obtained above include a substrate and a coating on the surface of the substrate. The substrate is a low-carbon steel substrate, and the coating is made from the ceramic coating of Example 3. The thickness of the coating is 100 μm.

[0220] Example 18

[0221] This embodiment provides a coated part, which can be prepared by using the ceramic coating of Example 4 and by preparing a coating on the surface of a substrate according to the coating application method in Example 4. The specific preparation method includes:

[0222] Take the ceramic coating from Example 4, first sandblast the low-carbon steel substrate, then spray the ceramic coating composition A onto the surface of the low-carbon steel substrate to form a base layer, then spray the ceramic coating composition B onto the base layer, and finally cure at 150°C for 1 hour, then raise the temperature to 300°C for 2 hours to obtain the coated part.

[0223] The coated parts obtained above include a substrate and a coating on the surface of the substrate. The substrate is a low-carbon steel substrate, and the coating is made from the ceramic coating of Example 4. The thickness of the coating is 40 μm.

[0224] Examples 19-28

[0225] Examples 19-28 each provide a coated part, which differs from Example 15 in that: Examples 19-28 use ceramic coatings from Examples 5-14 instead of the ceramic coating from Example 1 used in Example 15, while the rest is the same as Example 15.

[0226] Comparative Examples 4-6

[0227] Comparative Examples 4 to 6 each provide a coated part, which differs from Example 15 in that: Comparative Examples 4 to 6 use ceramic coatings of Comparative Examples 1 to 3 instead of the ceramic coating of Example 1 used in Example 15, and are otherwise the same as Example 15.

[0228] Performance testing

[0229] 1. Hardness test

[0230] The test method is as follows: Referring to GB / T 6739-2006, place the pencil vertically on the coating of the workpiece, press down on the lead with a certain amount of force, and then draw a straight line on the coating. The hardness grade of the pencil is determined based on the depth and uniformity of the drawn line.

[0231] The hardness of the coatings on the coated parts of Examples 15-18 and Comparative Examples 4 and 5 was tested using the above method, and the results are shown in Table 1.

[0232] 2. Contact Angle Test

[0233] The test method is as follows: place the coated part on the contact angle tester, drop 10μL of water onto the coating surface, and test it using the contact angle tester.

[0234] The hardness of the coatings on the coated parts of Examples 15-18 and Comparative Examples 4 and 5 was tested using the above method. The results are shown in Table 1. The test results for Example 15 are also shown in Table 1. Figure 7 As shown.

[0235] 3. Easy-to-clean performance test

[0236] The test method is as follows: 1 mL of egg white is dropped onto the coating of the coated part, and the egg is fried at 140°C. After the egg white solidifies, it is removed with tweezers, and the coating surface is examined to see if there is any residue.

[0237] The easy-to-clean performance of the coatings on the coated parts of Examples 15-18 and Comparative Examples 4 and 5 was tested using the above methods. The results are shown in Table 1. The test results for Example 15 are also as follows: Figure 8 As shown. Figure 8 (a) and (b) are photographs of the coated surface of the sample from Example 15 before and after the removal of the cured egg white.

[0238] 4. Corrosion resistance test

[0239] Test method: Referring to GB / T 10125-2021, the coated sample and the coated sample treated at 400℃ for 20 hours were placed in a neutral salt spray chamber, and the surface corrosion was observed periodically. The corrosion resistance performance of Examples 15-18 and Comparative Examples 4-6 were tested according to the above method, and the results are shown in Table 1.

[0240] Referring to GB / T 10125-2021, the coated parts of Example 15 and Comparative Example 4 were subjected to isothermal heat treatment at 400°C for 80 hours. The surface condition of the coating on the coated parts after isothermal heat treatment was then observed using a scanning electron microscope. The results are as follows: Figure 9 , Figure 10 As shown; the coated parts of Comparative Example 4, after constant temperature heat treatment, were placed in a neutral salt spray chamber for 24 hours, and the coated parts of Example 15, after constant temperature heat treatment, were placed in a neutral salt spray chamber for 200 hours. The surface corrosion was observed, and the results are as follows. Figure 11 As shown, Figure 11 (a) and (b) correspond to the surface corrosion of the coated parts in Example 4 and Example 15, respectively.

[0241] In addition, the coatings of Examples 19-28 and Comparative Examples 4 and 6 were subjected to isothermal heat treatment at 400°C, and the time it took for cracks to appear on the coating surface of the coatings was recorded. The results are shown in Table 2.

[0242] Table 1

[0243]

[0244]

[0245] Table 2

[0246]

[0247] As can be seen from the test results in Table 1 above, the coating hardness of the coated parts in Examples 15 to 18 is 9H, which indicates good mechanical properties.

[0248] According to Table 1 and Figure 7 The results shown, in combination with the settings of Examples 15-18 and Comparative Examples 4 and 5, show that in the coating of Comparative Example 4, the ceramic coating composition A used to construct the coating on the substrate does not contain toughening filler; in the coating of Comparative Example 5, the substrate surface is only coated with a ceramic coating containing only composition A, without further applying composition B on composition A; and in the coatings of Examples 15-18, the coatings of ceramic coating composition A (containing fibrous whisker toughening filler) and composition B are applied sequentially to the substrate surface to construct the coating. Compared with Comparative Example 5, the coatings on the substrate surface of the coatings of Examples 15-18 have a larger contact angle and better hydrophobicity.

[0249] Furthermore, from Table 1 and Figure 8 It can be seen that the coatings in Examples 15-18, constructed by sequentially applying Composition A and Composition B to the substrate surface using the ceramic coating of Example 1, can achieve excellent easy-to-clean properties. In contrast, the coating in Comparative Example 5, constructed by applying only a ceramic coating containing Composition A to the substrate surface without further applying Composition B on top of Composition A, has poor easy-to-clean properties.

[0250] Furthermore, from Table 1 and Figures 9-11 Comparing the test results of the coated parts in Examples 15-18 and Comparative Examples 4 and 5, it can be seen that the coated part in Comparative Example 4 has good corrosion resistance at room temperature. However, because the ceramic coating composition A used in the coating construction does not contain toughening fillers, the coated part in Comparative Example 4 has poor high-temperature resistance. After being treated at 400℃ for 20 hours, network microcracks appeared, causing the coating barrier effect to fail, and water could easily seep into the substrate through the cracks, causing corrosion. Furthermore, after being heat-treated at 400℃ for 80 hours, fine cracks appeared on the surface of the coated part in Comparative Example 4. Figure 10 As shown; the coated part of Comparative Example 4, after being heat-treated at 400℃ for 80 hours, was placed in a neutral salt spray chamber for 24 hours and became covered with rust, as shown. Figure 11 As shown in Figure (a), the coating of Comparative Example 4 exhibits poor corrosion resistance under high-temperature conditions.

[0251] Compared to Comparative Example 4, the ceramic coating composition A used in the coating construction of Example 15 incorporates toughening fillers such as single-crystal SiC nanorods, magnesium borate whiskers, and carbon nanotube whiskers. These fibrous whiskers, acting as toughening fillers, deflect high-temperature stress and fracture paths, and bridge cracks, thus consuming fracture energy and creating complex crack formation modes, effectively preventing coating cracking. Furthermore, by combining with composition B, they form and enhance the hybrid network strength, improving the coating's adhesion strength and density, effectively achieving surface barrier properties. This results in the coated part exhibiting excellent corrosion resistance at room temperature, with a neutral salt spray resistance exceeding 480 hours (further testing at room temperature and neutral salt spray resistance even exceeding 720 hours), and excellent high-temperature resistance. After being treated at 400°C for 2 hours, the coating remains intact and crack-free, with a salt spray resistance of 240 hours. After being heat-treated at 400°C for 80 hours, the coated part in Example 15 showed no microscopic cracks on its surface. Figure 9 As shown; after heat treatment at 400℃ for 80 hours, the coated part of Example 15 was placed in a neutral salt spray chamber for 200 hours, and only a small number of rust spots appeared, such as Figure 11 As shown in (b), the coating of Example 15 exhibits long-lasting temperature resistance and maintains excellent corrosion resistance in high-temperature environments. The ceramic coating composition A used in the coating construction of Examples 16-18, with the addition of fibrous whisker toughening fillers, also exhibits excellent high-temperature resistance and corrosion resistance.

[0252] In contrast, the coating of Comparative Example 5 has a coating on the substrate surface made of ceramic coating containing only composition A. Although composition A contains toughening filler single-crystal SiC nanorods, magnesium borate whiskers and carbon nanotube whiskers, which is beneficial to prevent cracking under high temperature conditions, composition B was not further applied to composition A. The degree of hybrid network formed in the coating is low, the density is insufficient, and it cannot effectively form a surface barrier. Water can easily penetrate into the substrate and cause corrosion. Therefore, the overall corrosion resistance of this coating is poor, both at room temperature and at high temperature.

[0253] As shown in Table 2, the addition of fibrous whisker toughening filler to composition A of the ceramic coatings used in the coatings of Examples 19-28 significantly improves the crack resistance of the coating, effectively preventing and inhibiting the formation of cracks under high-temperature conditions, thus ensuring excellent corrosion resistance even at 400℃. In Comparative Example 4, the ceramic material used in Comparative Example 1 for the coating did not contain toughening filler in composition A, resulting in poor high-temperature resistance; cracks appeared in less than 8 hours at 400℃. In Comparative Example 6, the ceramic coating used in Comparative Example 3 for the coating contained granular polycrystalline silicon carbide as toughening filler in composition A, which could not achieve the high-temperature stress, crack path deflection, and crack bridging effects of fibrous whisker toughening filler, thus failing to effectively prevent crack formation. The coating also cracked quickly at 400℃, failing to guarantee corrosion resistance at high temperatures.

[0254] Furthermore, comparing the test results of the coated parts in Examples 19-28 in Table 2, it can be seen that compared with using carbon nanotube whiskers and / or magnesium borate whiskers as toughening fillers, when the toughening filler contains single-crystal SiC nanorods, the time required for cracks to appear in the coating on the coated parts is significantly increased, and the high-temperature resistance and corrosion resistance of the coating are significantly improved. This is mainly because single-crystal SiC nanorods have high hardness, which can be used to generate a rigid barrier effect through their high hardness and nanorod structure, producing a crack bridging effect, effectively deflecting high-temperature stress and crack paths, complex crack initiation modes, improving the crack resistance of the coating, and effectively preventing crack formation and crack propagation in the coating; in addition, single-crystal SiC nanorods have stable performance in high-temperature resistance and corrosion resistance, and their main structural parameters, including aspect ratio and coefficient of thermal expansion, are more matched with the coating system, resulting in a better overall toughening effect.

[0255] As described above, this invention uses a raw material composition comprising sol A and inorganic filler A containing fibrous whisker toughening filler to prepare composition A, and uses a raw material composition comprising sol B, inorganic filler B containing hardening filler, organosilicon pre-ceramic precursor B and catalyst B to prepare composition B. Composition A and composition B are used together as a ceramic coating, and composition A is configured to be applied to the surface of a substrate to form a base coating, and composition B is configured to be applied on top of the base coating of composition A. In composition A, sol A can form a good bond with the substrate, and fibrous whisker toughening filler is added, which can deflect high-temperature stress and crack paths, lengthen and tortuosize crack paths, consume fracture energy, and change the crack initiation mode to a mixed mode including shearing / tearing / pull-out, increasing the energy required for crack propagation. In addition, the fibrous whisker structure of the toughening filler generates a bridging effect, which can improve the crack resistance of the coating and effectively prevent or hinder crack initiation. In the raw material component of composition B, which is configured to be applied to the base coating of composition A, the organosilicon ceramic precursor B and sol B can react under the action of catalyst B to construct a hybrid network structure and undergo partial gelation. After being applied to the base coating of composition A, the unreacted organosilicon ceramic precursor B and its intermediate products in composition B can react with the unreacted sol A in composition A to further construct and enhance the hybrid network structure, thereby improving the coating's bonding strength, density, and high-temperature stability. At the same time, based on the fibrous whisker structure and bridging effect of the toughening filler in composition A and the partial gelation of composition B, the overall coating forms a structure in which the inorganic filler, including the fibrous whisker toughening filler in composition A, is basically maintained in the inner layer region close to the substrate, while the partially gelled composition B is more concentrated in the outer layer region of the coating to form a surface barrier. The inner layer structure close to the substrate can effectively toughen and prevent cracking, while the surface barrier layer can ensure the coating's corrosion resistance and help maintain a smooth surface, giving the coating excellent easy-to-clean properties. Therefore, by combining composition A and composition B, the coating exhibits excellent easy-to-clean properties and significantly improves its high-temperature resistance, making it less prone to cracking at high temperatures. This ensures excellent corrosion resistance even at 400°C. Furthermore, the synergistic use of composition A and composition B in the ceramic coating process results in a coating with excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties.

[0256] The ceramic coatings or coated parts described above can be further used in the field of household appliances. The coated parts can be accessories for household appliances, specifically including but not limited to the inner pot of a rice cooker, the baking tray of an oven, etc. Based on the above ceramic coatings used to construct coatings, the coatings can possess excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties. Alternatively, the coating on the coated part can also give the coated part excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties. Therefore, applying them to the field of household appliances can enable the corresponding downstream products or their application components using the ceramic coatings or coated parts to also possess excellent high-temperature resistance, corrosion resistance, and easy-to-clean properties. Furthermore, the ceramic coatings or coated parts can be specifically applied to high-temperature environments in household appliances, and can still maintain excellent corrosion resistance under high-temperature conditions.

[0257] Furthermore, the present invention also proposes a household appliance comprising any of the aforementioned coated parts of the present invention. Specifically, this household appliance can be any of the following: oven, microwave oven, air fryer, rice cooker, pressure cooker, disinfection cabinet, steam oven, range hood, stove, dishwasher, air conditioner, water heater, etc. However, it should be noted that the household appliance is not limited to the types of appliances listed above.

[0258] Since the above-mentioned household appliances contain any of the aforementioned coatings of the present invention, and the coatings have excellent high temperature resistance, corrosion resistance and easy cleaning properties, the household appliances or corresponding components using the coatings also have excellent high temperature resistance, corrosion resistance and easy cleaning properties.

[0259] The present invention has been described in detail above with reference to the embodiments. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A ceramic coating, characterized by, Includes composition A and composition B; The raw material components of the composition A include sol A and inorganic filler A, wherein the inorganic filler A includes a toughening filler, and the toughening filler is a fibrous whisker toughening filler; the composition A is configured to be applied to the surface of a substrate to form a base coating. The raw material components of the composition B include sol B, inorganic filler B, organosilicon ceramic precursor B, and catalyst B, wherein the inorganic filler B includes a hardening filler; the composition B is configured to be applied to the primer coating. The inorganic packing A and / or the inorganic packing B also include corrosion-resistant packing.

2. The ceramic coating of claim 1, wherein, The toughening filler includes at least one of the following: single-crystal SiC nanorods, carbon nanotube whiskers, potassium titanate whiskers, magnesium borate whiskers, magnesium oxide whiskers, aluminum borate whiskers, zinc oxide whiskers, halloysite whiskers, magnesium carbonate whiskers, boron carbide whiskers, silicon nitride whiskers, mullite whiskers, calcium sulfate whiskers, barium sulfate whiskers, Al2O3 whiskers, ZrO2 whiskers, and Si3N4 whiskers.

3. The ceramic coating according to claim 2, characterized in that, The toughening filler includes at least one of carbon nanotube whiskers, potassium titanate whiskers, magnesium borate whiskers, magnesium oxide whiskers, aluminum borate whiskers, zinc oxide whiskers, halloysite whiskers, magnesium carbonate whiskers, boron carbide whiskers, silicon nitride whiskers, mullite whiskers, calcium sulfate whiskers, barium sulfate whiskers, Al2O3 whiskers, ZrO2 whiskers, and Si3N4 whiskers combined with single-crystal SiC nanorods.

4. The ceramic coating according to claim 1, characterized in that, The fibrous whisker toughening filler satisfies at least one of the following conditions: The aspect ratio of the fibrous whisker toughening filler is (5-60):

1. The length of the fibrous whisker toughening filler is 10 μm to 60 μm; The diameter of the fibrous whisker toughening filler is 1 μmm to 10 μm.

5. The ceramic coating according to claim 1, characterized in that, At least one of the following conditions must be met: In the raw material components of the composition A, the mass ratio of sol A to the toughening filler is 1:(0.02-0.67); sol A and / or sol B are independently selected from at least one of aluminum sol, silica sol, zirconium oxide sol, nickel oxide sol, and cerium oxide sol. The hardening filler is selected from at least one of mica, silica fume, zirconium oxide, alumina, calcium carbonate, barium sulfate, and talc. In the raw material components of the composition B, the mass ratio of the sol B to the inorganic filler B is 1:(0.02-1.5); the organosilicon ceramic precursor B is selected from at least one of γ-aminopropyltriethoxysilane, hexadecyltriethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, trimethylchlorosilane, diphenyldimethoxysilane, and phenyltrimethoxysilane. In the raw material components of the composition B, the mass ratio of the sol B to the organosilicon ceramic precursor B is 1:(0.06~1.65); Catalyst B is selected from acidic catalysts or basic catalysts; In the raw material components of the composition B, the mass ratio of the sol B to the catalyst B is 1:(0.002-0.05); the anti-corrosion filler is selected from at least one of zinc molybdate, zinc phosphate, aluminum tripolyphosphate, silicon phosphate, zinc borate, zinc powder, aluminum powder, mica, iron oxide, cerium oxide, zinc oxide, silica powder, zirconium oxide powder, talc powder, and wollastonite. In the raw material components of the composition A, the mass ratio of the sol A to the anti-corrosion filler is 1:(0.02~2.34).

6. The ceramic coating according to claim 5, characterized in that, The raw material components of composition A also include organosilicon ceramic precursor A and catalyst A.

7. The ceramic coating according to claim 6, characterized in that, At least one of the following conditions must be met: The organosilicon ceramic precursor A is selected from at least one of γ-aminopropyltriethoxysilane, hexadecyltriethoxysilane, vinyltrimethoxysilane, methyltriethoxysilane, trimethylchlorosilane, diphenyldimethoxysilane, and phenyltrimethoxysilane. In the raw material components of the composition A, the mass ratio of the sol A to the organosilicon ceramic precursor A is 1:(0.02~1.34); Catalyst A is selected from acidic catalysts or basic catalysts; In the raw material components of the composition A, the mass ratio of the sol A to the catalyst A is 1:(0.002~0.067).

8. The ceramic coating according to any one of claims 1 to 7, characterized in that, The ceramic coating is a water-based ceramic coating.

9. The ceramic coating according to claim 8, characterized in that, At least one of the following conditions must be met: The raw material components of composition A also include aqueous solvent A; The raw material components of composition B also include aqueous solvent B.

10. The ceramic coating according to claim 9, characterized in that, At least one of the following conditions must be met: The raw material components of the composition A include sol A, anti-corrosion filler, toughening filler, aqueous solvent A, organosilicon ceramic precursor A and catalyst A, and the amount of the toughening filler accounts for 0.1% to 10% of the total mass of the raw material components of the composition A. The raw material components of the composition A include sol A, anti-corrosion filler, toughening filler, aqueous solvent A, organosilicon ceramic precursor A and catalyst A in a mass ratio of (15-50):(1-30):(1-10):(1-45):(1-20):(0.1-1); The raw material components of the composition B include sol B, hardening filler, aqueous solvent B, organosilicon ceramic precursor B and catalyst B in a mass ratio of (20-50):(1-30):(1-45):(3-33):(0.1-1).

11. A coated part, characterized in that, The coating comprises a substrate and a coating formed on the surface of the substrate, the coating being made from a ceramic coating according to any one of claims 1 to 10.

12. The method for preparing the coated part according to claim 11, characterized in that, Includes the following steps: Composition A of the ceramic coating is applied to the surface of the substrate to form a base coat; then composition B of the ceramic coating is applied to the base coat, followed by a curing process.

13. A household appliance, characterized in that, Includes the coated part as described in claim 11.

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