Laser titanium wear-resistant high-hardness kitchenware and preparation method thereof

Abstract

This invention discloses a laser-coated titanium wear-resistant high-hardness cookware and its preparation method, relating to the field of non-stick cookware technology. The laser-coated titanium wear-resistant high-hardness cookware of this invention includes a pot body and a non-stick coating disposed on the inner surface of the pot body. The non-stick coating is composed of multiple alternating layers of a nano-metal ceramic layer formed by ultra-high-speed laser cladding spraying and a nano-ceramic water-based coating formed by atomization spraying. During the preparation of the laser-coated titanium cookware of this invention, an ultra-high-speed laser cladding spraying is first performed to form a nano-metal ceramic layer. Then, using the residual heat of the laser cladding, an atomization spraying is performed on the surface of the nano-metal ceramic layer to form a nano-ceramic water-based coating, resulting in better adhesion of the nano-ceramic water-based coating and improved bonding strength between the two coatings. The non-stick coating is obtained by multiple alternating layers of the above two coatings, both of which possess high hardness and non-stick properties. Combined with their strong bonding strength, the non-stick coating achieves high hardness, wear resistance, and long-lasting non-stick properties.

Description

Technical Field

[0001] This invention relates to the field of non-stick cookware technology, and in particular to a laser-coated titanium wear-resistant and high-hardness cookware and its preparation method. Background Technology

[0002] Non-stick cookware typically achieves its non-stick function by coating its surface with a non-stick coating. Existing non-stick coating materials for cookware mainly include fluorinated coatings and ceramic coatings. Fluorinated coatings primarily include PTFE (polytetrafluoroethylene), PFOA (perfluorooctanoic acid), PFAS (a copolymer of perfluoropropyl perfluorovinyl ether and polytetrafluoroethylene), FEP (perfluoroethylene propylene copolymer), and ETFE (ethylene tetrafluoroethylene copolymer), etc. Their non-stick principle utilizes the extremely low surface free energy and low coefficient of friction of fluorinated polymers. However, fluorinated non-stick coatings are not wear-resistant and easily peel off. Furthermore, due to the low surface roughness of the cookware, the non-stick coating adhering to the surface is easily scratched and scraped off by spatulas or hard foods, resulting in a short lifespan for the non-stick coating and a gradual deterioration or even loss of non-stick properties. Ceramic coatings, on the other hand, are coatings primarily composed of silicon-oxygen bonds and inorganic silicon. They achieve a non-stick effect by forming a dense, non-porous nanostructure on the surface of the cookware. However, non-stick cookware with ceramic coatings is usually made of aluminum. The coefficient of thermal expansion of ceramic coating is much lower than that of aluminum. After frequent thermal expansion and contraction, the ceramic coating is prone to cracking. Generally, after 3 to 6 months of use, fine cracks will appear on the surface of the coating, and the non-stick properties will start to deteriorate.

[0003] In summary, current non-stick pans generally suffer from problems such as poor non-stick properties, short-lasting non-stick performance, and inability to withstand high-temperature stir-frying due to the inherent limitations of the materials used. Summary of the Invention

[0004] The technical problem to be solved by the present invention is that existing non-stick pans are not heat-resistant, have low hardness, poor wear resistance, and short service life.

[0005] To address the above problems, the present invention proposes the following technical solution:

[0006] This invention provides a laser-coated titanium wear-resistant and high-hardness cookware, including a pot body and a non-stick coating on the inner surface of the pot body. The non-stick coating is composed of multiple alternating layers of a nano-metal ceramic layer formed by ultra-high speed laser cladding spraying and a nano-ceramic water-based coating formed by atomization spraying.

[0007] The nano-metal ceramic layer comprises the following components by mass percentage: 15-45% titanium metal-coated particles and 55-85% composite ceramic powder;

[0008] The nano-ceramic aqueous coating comprises the following components by weight percentage: 20-30% polymethylsiloxane, 0.5-20% hydroxyl silicone oil, 1-5% low-melting-point glass powder, 6-10% silica sol, 5-10% silicon nitride, 5-10% nano titanium dioxide, 8-12% nano alumina, 6-8% nano titanium, 3-6% wetting and dispersing agent, 2-4% thickener, and 10-15% water;

[0009] The composite ceramic powder is selected from titanium nitride (TiN), titanium carbide (TiC), silicon carbide (SiC), titanium carbide nitride (TiCN), titanium boride (TiB), alumina (Al2O3), lanthanum oxide (La2O3), yttrium oxide (Y2O3), zirconium oxide (ZrO), magnesium oxide (MgO), and calcium hydroxyphosphate (CaO). 10 At least one of (PO4)6(OH)2 and iron powder (Fe);

[0010] The titanium-coated particles have a three-layer core-shell structure: an outer shell of titanium, a core layer of silicone oil, and a resin layer between the outer shell and the core layer. The resin layer is a mixture of polymethylsiloxane and iron powder. By mass percentage, the titanium accounts for 10-40%, the polymethylsiloxane accounts for 55-70%, the iron powder accounts for 0.5-2%, and the remainder is silicone oil.

[0011] The mass fraction of SiO2 in the silica sol is 1-50%, and the average particle size of SiO2 is in the range of 1 nm to 500 nm.

[0012] A further technical solution is that the titanium metal coated particles contain nano-sized titanium powder and nano-sized iron powder, which can be prepared using the following steps:

[0013] 1. Add nano-sized iron powder to polymethylsiloxane and disperse evenly to obtain a resin solution;

[0014] 2. Resin particles coated with silicone oil with smooth surface and uniform particle size distribution are prepared by using a fine emulsion polymerization method to combine resin solution and silicone oil.

[0015] 3. The resin particles are atomized into nano-sized titanium metal, so that the nano-titanium metal is uniformly attached to the surface of the resin particles, thereby achieving the effect of titanium metal completely coating the resin particles, and obtaining the titanium metal coated particles.

[0016] It should be noted that while silicone oil is non-stick, it has poor heat resistance. Coating silicone oil with resin containing iron powder, and then further coating it with titanium metal, yields titanium-coated particles. Under high-temperature spraying via ultra-high-speed laser cladding, the titanium metal absorbs heat and melts, protecting the resin and silicone oil and allowing them to remain within the coating. During the heating process of the cookware, the resin in the nano-metal ceramic layer containing these titanium-coated particles expands due to heat, causing the silicone oil to seep out through the resin's pores, thus improving the non-stick properties of the nano-metal ceramic layer. The addition of iron powder further enhances the heat resistance of the resin layer.

[0017] It is worth noting that the addition of titanium metal coated particles in the nano-metal ceramic layer helps to improve the non-stickiness of the coating, and the proportion is preferably 15-45%, with 20-35% being better. If the amount is too low, the non-stick effect of the nano-metal ceramic layer will be poor, while if the amount is too high, it will affect the bonding effect between the nano-metal ceramic layer and the nano-ceramic water-based coating.

[0018] A further technical solution is that the surface of the non-stick coating away from the pot body is a nano-ceramic water-based coating, and the surface of the non-stick coating in contact with the pot body is a nano-metal ceramic layer.

[0019] It should be noted that in the nano-ceramic aqueous coating, the wetting and dispersing agent can be selected from sodium tego tripolyphosphate; the thickener can be selected from swelling emulsion (HASE) thickener. Those skilled in the art can make the selection based on common technical knowledge, and the present invention does not limit this.

[0020] A further technical solution is that the composite ceramic powder is selected from titanium nitride (TiN), titanium carbide (TiC), silicon carbide (SiC), titanium carbide nitride (TiCN), titanium boride (TiB), alumina (Al2O3), lanthanum oxide (La2O3), yttrium oxide (Y2O3), zirconium oxide (ZrO), magnesium oxide (MgO), and calcium hydroxyphosphate (CaO). 10 At least three or at least six of the following are used to obtain a high-hardness nano-metal ceramic layer: (PO4)6(OH)2 and iron powder (Fe).

[0021] A further technical solution is that the particle size of the composite ceramic powder is 0.01-6 μm; and the particle size of the titanium metal coated particles is 2-6 μm.

[0022] A further technical solution is that the thickness of the non-stick coating is 30–1000 μm. For example, the thickness of the non-stick coating is 30 μm, 80 μm, 100 μm, 200 μm, 500 μm, 800 μm, or 1000 μm.

[0023] A further technical solution is that the thickness of the nano-metal-ceramic layer is 5–20 μm. For example, the thickness of the nano-metal-ceramic layer is 5 μm, 8 μm, 10 μm, 12 μm, 15 μm, 18 μm, or 20 μm.

[0024] It should be noted that the nano-metal ceramic layer has the characteristics of high hardness and low toughness. However, the bottom of the pot needs to be shaped during the forming process. If the thickness of the single-layer nano-metal ceramic layer is too high, it will crack due to its poor toughness, resulting in quality problems. Therefore, the thickness of the single-layer nano-metal ceramic layer should not be too thick, preferably 5 to 20 μm. This thickness range can avoid micro-cracks in the coating during the bottom shaping of the pot.

[0025] A further technical solution is that the thickness of the nano-ceramic water-based coating is 1–8 μm. For example, the thickness of the nano-ceramic water-based coating is 1 μm, 2 μm, 5 μm, or 8 μm.

[0026] A further technical solution is that the outer surface of the pot body is provided with a superconducting magnetic layer with a thickness of 300-600μm, for example, the thickness of the superconducting magnetic layer is 300μm, 400μm, 500μm, or 600μm.

[0027] Specifically, the superconducting magnetic layer is located at the bottom of the outer surface of the pot.

[0028] A further technical solution is that, by mass percentage, the superconducting magnetic layer comprises the following components:

[0029] 80-92% nickel-iron alloy, 0.03-2.5% carbon powder, 2-6% graphene, 1-3.5% chromium powder, 4-6% molybdenum powder, 0.5-3% copper powder; the nickel content in the nickel-iron alloy is 65-79% by mass.

[0030] A further technical solution is that the pot body is made of any one of aluminum, iron, stainless steel, copper, titanium, or ceramic.

[0031] The present invention also provides a method for preparing laser-coated titanium cookware as described in the first aspect, comprising the following steps:

[0032] S1. Sandblast the cleaned pot body;

[0033] S2. Heat the pot body to 120-180℃ and perform ultra-high-speed laser cladding spraying of nano-metal ceramic layer;

[0034] S3. Coat the nano-ceramic water-based coating onto the nano-metal ceramic layer;

[0035] S4. Repeat steps S2-S3 until the preset thickness is reached, and perform high-temperature melting and curing at 293-1693℃ to obtain a non-stick coating.

[0036] It should be noted that the high-temperature melting and curing in step S4 is to further solidify and bond the non-stick coating with the pot body, thereby improving their adhesion. The temperature should be determined according to the material of the pot body. For example, if the pot body is made of stainless steel, the high-temperature melting and curing temperature is between 1100-1300℃; if the pot body is made of aluminum, the high-temperature melting and curing temperature is between 293-500℃.

[0037] A further technical solution includes step S5:

[0038] S5. Apply a superconducting magnetic layer to the outer surface of the pot body using ultra-high-speed laser cladding.

[0039] Compared with the prior art, the technical effects achieved by the present invention include:

[0040] The laser-coated titanium cookware provided by this invention includes a pot body and a non-stick coating on the inner surface of the pot body. The non-stick coating is composed of alternating layers of a nano-metal-ceramic layer and a nano-ceramic water-based coating. The nano-metal-ceramic layer contains titanium metal-coated particles coated with resin and silicone oil, combined with composite ceramic powder, and is applied by ultra-high-speed laser cladding spraying. The resin and silicone oil in the titanium metal-coated particles can be effectively stored in the coating, giving the nano-metal-ceramic layer both high hardness and non-stick properties. The nano-ceramic water-based coating is formed on the surface of the nano-metal-ceramic layer using a combination of components such as polymethylsiloxane, hydroxyl silicone oil, low-melting-point glass powder, silica sol, silicon nitride, nano-titanium dioxide, nano-alumina, and nano-titanium, and also exhibits high hardness and non-stick properties. The alternating layers of the nano-metal-ceramic layer and the nano-ceramic water-based coating achieve a non-stick coating with high hardness, wear resistance, and long-lasting non-stick properties.

[0041] Furthermore, in the preparation of the laser titanium cookware of the present invention, an ultra-high-speed laser cladding spraying process is first performed to form a nano-metal-ceramic layer. Then, the residual heat from the laser cladding is used to atomize and spray a nano-ceramic water-based coating onto the surface of the nano-metal-ceramic layer, resulting in better adhesion and improved bonding between the two coatings. Simultaneously, the materials of the nano-metal-ceramic layer and the nano-ceramic water-based coating share certain similarities, which is beneficial for the bonding between the two coatings. The non-stick coating is obtained by repeatedly layering the two coatings alternately. Both coatings possess high hardness and non-stick properties, and the strong bonding between them results in a non-stick coating that achieves high hardness, wear resistance, and long-lasting non-stick performance. Attached Figure Description

[0042] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 This is a schematic diagram of the structure of the laser-coated titanium wear-resistant and high-hardness kitchenware provided in Embodiment 1 of the present invention;

[0044] Figure 2 for Figure 1 A magnified view of part A in the diagram;

[0045] Figure 3 This is a schematic diagram of the non-stick coating structure of laser-coated titanium wear-resistant and high-hardness kitchenware provided in an embodiment of the present invention;

[0046] Figure 4 This is a schematic diagram of the structure of titanium metal coated particles provided by the present invention.

[0047] Figure label:

[0048] The pot body 10, non-stick coating 20, superconducting magnetic layer 30, nano-metal ceramic layer 21, nano-ceramic water-based coating 22, outer shell layer 41, resin layer 42, and core layer 43. Detailed Implementation

[0049] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Similar component reference numerals in the drawings represent similar components. Obviously, the embodiments described below are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0050] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0051] It should also be understood that the terminology used in this specification of embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of the invention. As used in this specification of embodiments of the invention and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0052] Example 1

[0053] See Figure 1-3 This invention provides a laser-coated titanium wear-resistant high-hardness cookware. As shown in the figure, the laser-coated titanium wear-resistant high-hardness cookware includes a pot body 10, a non-stick coating 20 on the inner surface of the pot body, and a superconducting magnetic layer 30 on the outer surface of the pot body. The non-stick coating 20 is composed of alternating layers of a nano-metal ceramic layer 21 formed by ultra-high-speed laser cladding spraying and a nano-ceramic water-based coating 22 formed by atomization spraying. Specifically, the surface of the non-stick coating 20 away from the pot body 10 is the nano-ceramic water-based coating 22, and the surface of the non-stick coating 20 in contact with the pot body 10 is the nano-metal ceramic layer 21.

[0054] The nano-metal-ceramic layer comprises the following components by mass percentage: 30% titanium-coated particles and 70% composite ceramic powder; the composite ceramic powder is TiN, TiC, SiC, TiCN, TiB, Al2O3, La2O3, Y2O3, ZrO, MgO, and Ca. 10 (PO4)6(OH)2, Fe.

[0055] The nano-ceramic water-based coating comprises the following components by mass percentage: 25% polymethylsiloxane, 10% hydroxyl silicone oil, 3% low-melting-point glass powder, 10% silica sol, 7% silicon nitride, 10% nano titanium dioxide, 10% nano alumina, 7% nano titanium, 3% wetting and dispersing agent, 3% thickener, and 12% water.

[0056] See Figure 4 The titanium-coated particles have a three-layer core-shell structure. The outer shell layer 41 is titanium metal, the inner core layer 43 is silicone oil, and the space between the outer shell layer 41 and the inner core layer 43 is a resin layer 42. The resin layer 42 is a mixture of polymethylsiloxane and iron powder. By mass percentage, the titanium metal accounts for 30%, the polymethylsiloxane accounts for 58%, the iron powder accounts for 2%, and the remainder is silicone oil.

[0057] In this embodiment, the titanium metal coated particles are nano-sized titanium powder and nano-sized iron powder, and can be prepared using the following steps:

[0058] 1. Add nano-sized iron powder to polymethylsiloxane and disperse evenly to obtain a resin solution;

[0059] 2. Resin particles coated with silicone oil with smooth surface and uniform particle size distribution are prepared by using a fine emulsion polymerization method to combine resin solution and silicone oil.

[0060] 3. The resin particles are atomized into nano-sized titanium metal, so that the nano-titanium metal is uniformly attached to the surface of the resin particles, thereby achieving the effect of titanium metal completely coating the resin particles, and obtaining the titanium metal coated particles.

[0061] In this embodiment, the thickness of the superconducting magnetic layer is 500 μm, and the composition of the superconducting magnetic layer is as follows:

[0062] The alloy consists of 85% nickel-iron alloy, 1.8% carbon powder, 4% graphene, 2.2% chromium powder, 5% molybdenum powder, and 2% copper powder; the nickel content in the nickel-iron alloy is 70% by mass; and the particle size of the above powders is 0.01-6 micrometers.

[0063] In this embodiment, the particle size of the composite ceramic powder is 0.01-6 micrometers; the particle size of the titanium metal coated particles is 2-6 micrometers.

[0064] In this embodiment, the thickness of the non-stick coating is 300 μm. The thickness of the nano-metal ceramic layer is 10 μm, and the thickness of the nano-ceramic water-based coating is 5 μm, and these layers are alternately stacked 20 times.

[0065] In this embodiment, the pot body is made of stainless steel.

[0066] This invention also provides a method for preparing the above-mentioned laser-coated titanium cookware, comprising the following steps:

[0067] S1. Sandblast the cleaned pot body;

[0068] S2. Heat the pot body to 120-180℃ and perform ultra-high-speed laser cladding spraying of nano-metal ceramic layer;

[0069] S3. Coat the nano-ceramic water-based coating onto the nano-metal ceramic layer;

[0070] S4. Repeat steps S2-S3 until the preset thickness is reached, and perform high-temperature melting and curing at 1200℃ to obtain a non-stick coating.

[0071] S5. Apply a superconducting magnetic layer to the outer surface of the pot body using ultra-high-speed laser cladding.

[0072] Example 2

[0073] This invention provides a laser-coated titanium wear-resistant, high-hardness cookware, comprising a pot body, a non-stick coating on the inner surface of the pot body, and a superconducting magnetic layer on the outer surface of the pot body. The non-stick coating is composed of alternating layers of a nano-metal-ceramic layer formed by ultra-high-speed laser cladding and a nano-ceramic water-based coating formed by atomization spraying. Specifically, the side of the non-stick coating away from the pot body is the nano-ceramic water-based coating, and the side of the non-stick coating in contact with the pot body is the nano-metal-ceramic layer.

[0074] The nano-metal-ceramic layer comprises the following components by mass percentage: 25% titanium-coated particles and 75% composite ceramic powder; the composite ceramic powder is TiN, TiC, SiC, TiCN, TiB, Al2O3, La2O3, Y2O3, ZrO, MgO, and Ca. 10 (PO4)6(OH)2, Fe.

[0075] The nano-ceramic waterborne coating comprises the following components by weight percentage: 25% polymethylsiloxane, 10% hydroxyl silicone oil, 3% low-melting-point glass powder, 10% silica sol, 7% silicon nitride, 10% nano titanium dioxide, 10% nano alumina, 7% nano titanium, 3% wetting and dispersing agent, 3% thickener, and 12% water.

[0076] The titanium-coated particles have a three-layer core-shell structure: an outer shell of titanium, a core layer of silicone oil, and a resin layer between the outer shell and the core layer. The resin layer is a mixture of polymethylsiloxane and iron powder. By mass percentage, the titanium accounts for 30%, the polymethylsiloxane accounts for 58%, the iron powder accounts for 2%, and the remainder is silicone oil.

[0077] In this embodiment, the titanium metal coated particles are nano-sized titanium powder and nano-sized iron powder, and can be prepared using the following steps:

[0078] 1. Add nano-sized iron powder to polymethylsiloxane and disperse evenly to obtain a resin solution;

[0079] 2. Using fine emulsion polymerization, smooth-surfaced particles with uniform particle size distribution are prepared to obtain resin particles coated with silicone oil.

[0080] 3. The resin particles are atomized into nano-sized titanium metal, so that the nano-titanium metal is uniformly attached to the surface of the resin particles, thereby achieving the effect of titanium metal completely coating the resin particles, and obtaining the titanium metal coated particles.

[0081] In this embodiment, the thickness of the superconducting magnetic layer is 450 μm, and the composition of the superconducting magnetic layer is as follows:

[0082] It contains 85% nickel-iron alloy, 1.8% carbon powder, 4% graphene, 2.2% chromium powder, 5% molybdenum powder, and 2% copper powder; the nickel content in the nickel-iron alloy is 70% by mass.

[0083] In this embodiment, the particle size of the composite ceramic powder is 0.01-6 micrometers; the particle size of the titanium metal coated particles is 2-6 micrometers.

[0084] In this embodiment, the thickness of the non-stick coating is 300 μm. The thickness of the nano-metal ceramic layer is 8 μm, and the thickness of the nano-ceramic water-based coating is 7 μm, and they are alternately layered 20 times.

[0085] In this embodiment, the pot body is made of stainless steel.

[0086] This invention also provides a method for preparing the above-mentioned laser-coated titanium cookware, comprising the following steps:

[0087] S1. Sandblast the cleaned pot body;

[0088] S2. Heat the pot body to 120-180℃ and perform ultra-high-speed laser cladding spraying of nano-metal ceramic layer;

[0089] S3. Coat the nano-ceramic water-based coating onto the nano-metal ceramic layer;

[0090] S4. Repeat steps S2-S3 until the preset thickness is reached, and perform high-temperature melting and curing at 1200℃ to obtain a non-stick coating.

[0091] S5. Apply a superconducting magnetic layer to the outer surface of the pot body using ultra-high-speed laser cladding.

[0092] Example 3

[0093] This invention provides a laser-coated titanium wear-resistant, high-hardness cookware and its preparation method, comprising a pot body, a non-stick coating on the inner surface of the pot body, and a superconducting magnetic layer on the outer surface of the pot body. The non-stick coating is composed of alternating layers of a nano-metal-ceramic layer formed by ultra-high-speed laser cladding spraying and a nano-ceramic water-based coating formed by atomization spraying. The side of the non-stick coating away from the pot body is the nano-ceramic water-based coating, and the side of the non-stick coating in contact with the pot body is the nano-metal-ceramic layer.

[0094] The nano-metal-ceramic layer comprises the following components by mass percentage: 20% titanium-coated particles and 80% composite ceramic powder; the composite ceramic powder is TiN, TiC, SiC, TiCN, TiB, Al2O3, La2O3, Y2O3, ZrO, MgO, and Ca. 10 (PO4)6(OH)2, Fe.

[0095] The nano-ceramic waterborne coating comprises the following components by weight percentage: 25% polymethylsiloxane, 10% hydroxyl silicone oil, 3% low-melting-point glass powder, 10% silica sol, 7% silicon nitride, 10% nano titanium dioxide, 10% nano alumina, 7% nano titanium, 3% wetting and dispersing agent, 3% thickener, and 12% water.

[0096] The titanium-coated particles have a three-layer core-shell structure: an outer shell of titanium, a core layer of silicone oil, and a resin layer between the outer shell and the core layer. The resin layer is a mixture of polymethylsiloxane and iron powder. By mass percentage, the titanium accounts for 30%, the polymethylsiloxane accounts for 58%, the iron powder accounts for 2%, and the remainder is silicone oil.

[0097] In this embodiment, the titanium metal coated particles are nano-sized titanium powder and nano-sized iron powder, and can be prepared using the following steps:

[0098] 1. Add nano-sized iron powder to polymethylsiloxane and disperse evenly to obtain a resin solution;

[0099] 2. Using fine emulsion polymerization, smooth-surfaced particles with uniform particle size distribution are prepared to obtain resin particles coated with silicone oil.

[0100] 3. The resin particles are atomized into nano-sized titanium metal, so that the nano-titanium metal is uniformly attached to the surface of the resin particles, thereby achieving the effect of titanium metal completely coating the resin particles, and obtaining the titanium metal coated particles.

[0101] In this embodiment, the thickness of the superconducting magnetic layer is 400 μm, and the composition of the superconducting magnetic layer is as follows:

[0102] It contains 85% nickel-iron alloy, 1.8% carbon powder, 4% graphene, 2.2% chromium powder, 5% molybdenum powder, and 2% copper powder; the nickel content in the nickel-iron alloy is 70% by mass.

[0103] In this embodiment, the particle size of the composite ceramic powder is 0.01-6 micrometers; the particle size of the titanium metal coated particles is 2-6 micrometers.

[0104] In this embodiment, the thickness of the non-stick coating is 150 μm. The thickness of the nano-metal ceramic layer is 12 μm, and the thickness of the nano-ceramic water-based coating is 3 μm, and these layers are alternately stacked 10 times.

[0105] In this embodiment, the pot body is made of aluminum.

[0106] This invention also provides a method for preparing the above-mentioned laser-coated titanium cookware, comprising the following steps:

[0107] S1. Sandblast the cleaned pot body;

[0108] S2. Heat the pot body to 120-180℃ and perform ultra-high-speed laser cladding spraying of nano-metal ceramic layer;

[0109] S3. Coat the nano-ceramic water-based coating onto the nano-metal ceramic layer;

[0110] S4. Repeat steps S2-S3 until the preset thickness is reached, and perform high-temperature melting and curing at 450℃ to obtain a non-stick coating.

[0111] S5. Apply a superconducting magnetic layer to the outer surface of the pot body using ultra-high-speed laser cladding.

[0112] Comparative Example 1: The difference from Example 1 is that the non-stick coating is a nano-metal-ceramic layer formed by ultra-high-speed laser cladding spraying, without a nano-ceramic water-based coating. During preparation, due to the high hardness and poor toughness of the nano-metal-ceramic layer, the resulting cookware cracked during the bottom shaping process, failing to meet product quality requirements.

[0113] Comparative Example 2: The difference from Example 1 is that the non-stick coating is a nano-ceramic water-based coating formed by atomization spraying, and does not contain a nano-metal ceramic layer.

[0114] Comparative Example 3: The difference from Example 1 is that the nano-metal ceramic layer is composed of 10% titanium metal coated particles and 90% composite ceramic powder.

[0115] Comparative Example 4: The difference from Example 1 is that the nano-metal ceramic layer is composed of 60% titanium metal coated particles and 40% composite ceramic powder.

[0116] Comparative Example 5: The difference from Example 1 is that the composition of the nano-metal ceramic layer does not contain titanium metal coated particles, and the titanium metal coated particles are replaced by nano-titanium powder, resin and silicone oil in the same proportion.

[0117] Comparative Example 6: The difference from Example 1 is that the thickness of the non-stick coating is 300 μm. The thickness of the nano-metal ceramic layer is 25 μm, and the thickness of the nano-ceramic water-based coating is 5 μm, alternately layered 20 times.

[0118] Comparative Example 7: The difference from Example 1 is that the pot body does not contain a superconducting magnetic layer, and the preparation method does not include step S5.

[0119] Performance testing

[0120] The cookware provided in Example 1 and Comparative Examples 2-7 were subjected to performance tests. The test results are shown in Table 1 below.

[0121] The abrasion resistance test method involves applying a static vertical pressure of 3 kg to the cookware using a 3M-7447 scouring pad and rubbing it back and forth. One cycle consists of the back and forth motions. The scouring pad is replaced every 1000 cycles, and the number of cycles is recorded.

[0122] The high temperature resistance test method is as follows: place the cookware in a constant temperature chamber at 350±5℃ for 0.5 hours, and then remove it and let it cool naturally to room temperature. If there are no abnormalities such as discoloration, blistering, melting, peeling, or cracking of the coating after the test, the cookware is deemed to be able to withstand the temperature. Then, the temperature of the constant temperature chamber is gradually increased in a temperature gradient of 50℃ to test the highest temperature that the cookware can withstand.

[0123] The test method for long-lasting non-stick properties is to heat the surface of the pan to 140℃~150℃, put in the cracked egg liquid, continue heating to 190℃~240℃, and after the egg white is basically solidified, use a plastic spatula to flip the egg and record the maximum number of times the egg can be fried under non-stick effect.

[0124] The hardness test method shall be carried out in accordance with GB / T 40737-2021, and 500 HV shall be used as the qualified standard for laser titanium hardness according to the enterprise standard.

[0125] The thermal efficiency test method is as follows: Turn on the intelligent programmable frequency converter instrument, set the voltage to 220V, press the start switch, and press the power switch on the display screen. Add 500ml of room temperature water to the sample. Connect the induction cooker to the power setting and heat it until the water boils. Record the power and time at boiling point, and calculate the thermal efficiency.

[0126] The test methods and standards for coating adhesion, heat and cold resistance, alkali resistance, acid resistance, and salt water corrosion resistance are all in accordance with the test items and test methods required by the national standard GB / T 2421-1998.

[0127] Test Project Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Comparative Example 7 Abrasion resistance (10,000 cycles) 52 27 35 23 27 31 51 High temperature resistance (°C) 550 400 450 500 350 <350 550 Hardness (HV) 756 539 641 728 537 410 738 Long-lasting non-stick 2860 1603 1420 1230 570 630 2740 Thermal efficiency % 94.7 92.1 93.5 90.2 89.1 64.7 54.8 Coating adhesion Incomplete peeling Incomplete peeling Incomplete peeling Shedding Incomplete peeling Incomplete peeling Incomplete peeling Heat and rapid cooling stability No bubbling or cracking No bubbling or cracking No bubbling or cracking No bubbling or cracking No bubbling or cracking cracking No bubbling or cracking Alkali resistance No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores Acid resistance No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores No peeling, cracking, or shrinkage pores Salt water corrosion resistance Free from defects such as blistering and erosion points Free from defects such as blistering and erosion points Free from defects such as blistering and erosion points Free from defects such as blistering and erosion points Free from defects such as blistering and erosion points Free from defects such as blistering and erosion points Free from defects such as blistering and erosion points

[0128] According to the results in Table 1, the laser-coated titanium wear-resistant high-hardness cookware provided in Example 1 of this invention has good hardness and wear resistance, can withstand high temperatures of 550℃, and has long-lasting non-stick properties. This is achieved by the alternating superposition of nano-metal ceramic layers and nano-ceramic water-based coatings, resulting in a non-stick coating with high hardness, wear resistance, and long-lasting non-stick properties. The cookware in Comparative Example 2 only has a nano-ceramic water-based coating, which has some non-stick properties, but its wear resistance is poor and its long-lasting non-stick effect is not good. In the cookware in Comparative Example 3, the content of titanium metal coated particles in the nano-metal ceramic layer is low, affecting the coating's hardness and long-lasting non-stick properties. In the cookware in Comparative Example 4, the content of titanium metal coated particles in the nano-metal ceramic layer is high. Because the titanium metal coated particles contain resin and silicone oil, the bonding force between the nano-ceramic water-based coating and the nano-metal ceramic layer is weak, affecting the hardness and long-lasting non-stick properties of the non-stick coating. Simultaneously, the low adhesion between coatings also leads to poor wear resistance. In Comparative Example 5, the titanium-coated particles were replaced with the same proportions of nano-titanium powder, resin, and silicone oil. During ultra-high-speed laser cladding spraying, the resin and silicone oil evaporated at high temperatures, causing the resulting nano-metal-ceramic layer to lose its non-stick effect. Therefore, once the surface layer of the non-stick coating—the nano-ceramic water-based coating—was worn away, the cookware lost its non-stick properties. In Comparative Example 6, the nano-metal-ceramic layer had a thickness of 25 μm. During cookware shaping, microcracks appeared in this coating. Even though these cracks were covered by the nano-ceramic water-based coating, high temperatures exacerbated the cracking. Data from Comparative Example 7 shows that the superconducting magnetic layer has high permeability, which can significantly improve the thermal efficiency of the cookware during use.

[0129] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0130] The above description describes specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should all be covered within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A laser titanium wear-resistant high-hardness kitchen utensil, characterized in that, It includes a pot body and a non-stick coating on the inner surface of the pot body, wherein the non-stick coating is composed of multiple alternating layers of nano-metal ceramic layer and nano-ceramic water-based coating. The nano-metal ceramic layer comprises the following components by mass percentage: 15-45% titanium metal-coated particles and 55-85% composite ceramic powder; The nano-ceramic aqueous coating comprises the following components by weight percentage: 20-30% polymethylsiloxane, 0.5-20% hydroxyl silicone oil, 1-5% low-melting-point glass powder, 6-10% silica sol, 5-10% silicon nitride, 5-10% nano titanium dioxide, 8-12% nano alumina, 6-8% nano titanium, 3-6% wetting and dispersing agent, 2-4% thickener, and 10-15% water; The composite ceramic powder is selected from at least one of titanium nitride, titanium carbide, silicon carbide, titanium carbide nitride, titanium boride, aluminum oxide, lanthanum oxide, yttrium oxide, zirconium oxide, magnesium oxide, calcium hydroxyphosphate, and iron powder. The titanium-coated particles have a three-layer core-shell structure: an outer shell of titanium, a core layer of silicone oil, and a resin layer between the outer shell and the core layer. The resin layer is a mixture of polymethylsiloxane and iron powder. By mass percentage, the titanium accounts for 10-40%, the polymethylsiloxane accounts for 55-70%, the iron powder accounts for 0.5-2%, and the remainder is silicone oil.

2. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 1, characterized in that, The particle size of the composite ceramic powder is 0.01-6 μm; the particle size of the titanium metal coated particles is 2-6 μm.

3. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 1, characterized in that, The thickness of the non-stick coating is 30–1000 μm.

4. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 1, characterized in that, The thickness of the nano-metal ceramic layer is 5–20 μm.

5. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 1, characterized in that, The thickness of the nano-ceramic aqueous coating is 1–8 μm.

6. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 1, characterized in that, The outer surface of the pot is provided with a superconducting magnetic layer with a thickness of 300-600 μm.

7. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 6, characterized in that, The superconducting magnetic layer comprises the following mass percentages: 80-92% nickel-iron alloy, 0.03-2.5% carbon powder, 2-6% graphene, 1-3.5% chromium powder, 4-6% molybdenum powder, 0.5-3% copper powder; the nickel content in the nickel-iron alloy is 65-79% by mass.

8. The laser-coated titanium wear-resistant high-hardness kitchenware as described in claim 1, characterized in that, The pot body is made of any one of the following materials: aluminum, iron, stainless steel, copper, titanium, or ceramic.

9. A method for preparing laser-treated titanium wear-resistant, high-hardness kitchenware as described in any one of claims 1-8, characterized in that, Includes the following steps: S1. Sandblast the cleaned pot body; S2. Heat the pot body to 120-180℃ and perform ultra-high-speed laser cladding spraying of nano-metal ceramic layer; S3. Coat the nano-ceramic water-based coating onto the nano-metal ceramic layer; S4. Repeat steps S2-S3 until the preset thickness is reached, and perform high-temperature melting and curing at 293-1693℃ to obtain a non-stick coating.

10. The preparation method according to claim 9, characterized in that, It also includes step S5: S5. Apply a superconducting magnetic layer to the outer surface of the pot body using ultra-high-speed laser cladding.

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