Pure inorganic high-temperature-resistant ceramic coating and preparation method thereof

Abstract

The invention discloses a pure inorganic high-temperature-resistant ceramic coating which comprises the following components in parts by weight: 40-60 parts of inorganic resin, 20-30 parts of high-temperature pigment, 10-20 parts of glass powder, 10-20 parts of zinc phosphate, 3-5 parts of high-temperature functional filler, 0.2-0.5 part of a flash rust inhibitor and 1-2 parts of deionized water. The invention also discloses a preparation method of the pure inorganic high-temperature-resistant ceramic material. Compared with the prior art, the high temperature resistance of the coating can be improved, and the hardness of the coating is improved.

Description

Technical Field

[0001] The invention relates to the technical field of coatings, and in particular to a pure inorganic high-temperature resistant ceramic coating and a preparation method thereof. Background Art

[0002] In today's industrial field, the importance of high temperature resistant coatings is becoming increasingly prominent. With the continuous development of industrial technology, equipment and facilities in various high temperature environments have put forward higher requirements on the performance of coatings.

[0003] Traditional coatings often reveal many shortcomings when facing high temperature challenges. On the one hand, traditional coatings have limited high temperature resistance and it is difficult to maintain stable performance in a continuous high temperature environment. When exposed to high temperatures, the coating is prone to softening, deformation, and even falling off, which not only affects the appearance of the equipment, but also seriously threatens the normal operation and service life of the equipment. For example, in high-temperature operation scenarios such as steel smelting and chemical production, traditional coatings cannot withstand the erosion of high temperatures, resulting in frequent maintenance and re-coating of equipment, which increases production costs and production time.

[0004] On the other hand, traditional coatings have poor corrosion resistance after high-temperature oxidation. In high-temperature environments, coatings easily react with oxygen in the air, causing corrosion and damage to the coating. This makes the equipment susceptible to corrosion during long-term use, reducing the reliability and safety of the equipment. Especially in some harsh industrial environments, such as places containing corrosive gases or chemicals, the problem of insufficient corrosion resistance of traditional coatings is more prominent.

[0005] In addition, the hardness requirements for coatings are also increasing. In some occasions that need to withstand mechanical wear and impact, such as the surface coating of industrial machinery, low-hardness coatings are easily worn and scratched, thus losing their protective effect on the equipment. However, the existing coatings are not ideal in improving hardness and cannot meet the demand for high-strength protective coatings in industrial production.

[0006] In view of this, a pure inorganic high temperature resistant ceramic coating and a preparation method are proposed. Summary of the invention

[0007] The purpose of the present invention is to provide a pure inorganic high-temperature resistant ceramic coating and a preparation method, which can improve the high-temperature resistance of the coating and improve the hardness of the coating.

[0008] The above technical objectives of the present invention are achieved through the following technical solutions:

[0009] A pure inorganic high-temperature resistant ceramic coating comprises 40-60 parts by weight of an inorganic resin, 20-30 parts by weight of a high-temperature pigment, 10-20 parts by weight of glass powder, 10-20 parts by weight of zinc phosphate, 3-5 parts by weight of a high-temperature functional filler, 0.2-0.5 parts by weight of an anti-flash rust agent and 1-2 parts by weight of deionized water.

[0010] In a preferred embodiment, 40 parts by weight of inorganic resin, 20 parts by weight of high temperature pigment, 10 parts by weight of glass powder, 10 parts by weight of zinc phosphate, 3 parts by weight of high temperature functional filler, 0.2 parts by weight of anti-flash rust agent and 1 part by weight of deionized water are included.

[0011] In a preferred embodiment, 60 parts by weight of inorganic resin, 30 parts by weight of high temperature pigment, 20 parts by weight of glass powder, 20 parts by weight of zinc phosphate, 5 parts by weight of high temperature functional filler, 0.5 parts by weight of anti-flash rust agent and 2 parts by weight of deionized water are included.

[0012] In a preferred embodiment, 50 parts by weight of inorganic resin, 25 parts by weight of high temperature pigment, 15 parts by weight of glass powder, 15 parts by weight of zinc phosphate, 4 parts by weight of high temperature functional filler, 0.3 parts by weight of anti-flash rust agent and 2 parts by weight of deionized water are included.

[0013] A method for preparing a pure inorganic high temperature resistant ceramic coating comprises the following steps:

[0014] S1, take 40-60 parts by weight of inorganic resin, 20-30 parts by weight of high temperature pigment, 10-20 parts by weight of glass powder, 10-20 parts by weight of zinc phosphate, 3-5 parts by weight of high temperature functional filler, 0.2-0.5 parts by weight of anti-flash rust agent and 1-2 parts by weight of deionized water;

[0015] S2. Mix and stir the inorganic resin, high temperature pigment, glass powder, zinc phosphate and high temperature functional filler evenly, and grind them at high speed until the fineness reaches less than 30 um;

[0016] S3, adding anti-flash rust agent and deionized water, filtering and packaging to obtain the finished product.

[0017] Further, the process of step S2 specifically includes:

[0018] T1. Fully mixing the glass powder and the high temperature functional filler to obtain a mixed powder;

[0019] T2, heating the mixed powder to 600-650°C within 5-8 minutes, maintaining the target temperature for 1-3 minutes, and then cooling to room temperature;

[0020] T3, heating the cooled mixed powder to 800-900°C within 0.5-1min, maintaining the target temperature for 10s, and then cooling to room temperature;

[0021] T4. Add inorganic resin, high temperature pigment and zinc phosphate, mix and stir evenly, and grind at high speed until the fineness reaches less than 30um.

[0022] Furthermore, during step T3, an inert gas is introduced into the mixed powder.

[0023] Compared with the prior art, the pure inorganic high temperature resistant ceramic material of the present invention has the following advantages:

[0024] First, the use of inorganic resins greatly improves high temperature resistance. Compared with organic resins, inorganic resins have better stability in high temperature environments. It can withstand extremely high temperatures without decomposing or softening, ensuring that the coating maintains good adhesion and integrity under high temperature conditions. This feature makes the ceramic coating have a wide range of application prospects in high temperature working environments such as steel smelting, aerospace, etc. In the steel smelting process, equipment often faces temperatures of thousands of degrees, and traditional coatings are easy to fail. This inorganic high temperature resistant ceramic coating can stably protect the surface of the equipment and extend the service life of the equipment.

[0025] Second, it improves the corrosion resistance after high-temperature oxidation. In high-temperature environments, materials easily react with oxygen, leading to corrosion. The inorganic resin in the coating can form a dense protective film after high-temperature oxidation, preventing oxygen and other corrosive substances from further corroding the substrate. This is crucial for equipment that is in high-temperature, corrosive environments for a long time. For example, in the chemical industry, some reactors and pipelines need to operate under high temperature and strong corrosion conditions. The use of this ceramic coating can effectively protect the equipment and reduce maintenance and replacement costs.

[0026] Third, the addition of glass powder improves secondary ceramicization, thereby improving hardness, substrate temperature resistance and service life. Glass powder will undergo ceramicization transformation under high temperature to form a hard ceramic layer. This not only increases the hardness of the coating, making it better able to resist wear and scratches, but also further improves the temperature resistance of the substrate. When the coating is applied to the surface of various substrates, after high-temperature treatment, the ceramicization of the glass powder enables the substrate to withstand higher temperatures and extend the service life of the substrate. For example, the use of this coating on automotive engine parts can improve the heat resistance of the engine and reduce failures caused by high temperature. It also increases the wear resistance of the parts and improves the overall performance and reliability of the car.

[0027] In general, this inorganic high-temperature resistant ceramic coating shows outstanding advantages in high temperature resistance, corrosion resistance, hardness and substrate temperature resistance by using inorganic resin, glass powder and other ingredients. DETAILED DESCRIPTION

[0028] The present invention is further described in detail below.

[0029] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

[0030] Embodiment 1:

[0031] A method for preparing a pure inorganic high temperature resistant ceramic coating comprises the following steps:

[0032] S1, 40 parts by weight of inorganic resin, 20 parts by weight of high temperature pigment, 10 parts by weight of glass powder, 10 parts by weight of zinc phosphate, 3 parts by weight of high temperature functional filler, 0.2 parts by weight of anti-flash rust agent and 1 part by weight of deionized water;

[0033] S2. Mix and stir the inorganic resin, high temperature pigment, glass powder, zinc phosphate and high temperature functional filler evenly, and grind them at high speed until the fineness reaches less than 30 um;

[0034] S3, adding anti-flash rust agent and deionized water, filtering and packaging to obtain the finished product.

[0035] A pure inorganic high temperature resistant ceramic material prepared by the above steps has the following advantages:

[0036] First, the use of inorganic resins greatly improves high temperature resistance. Compared with organic resins, inorganic resins have better stability in high temperature environments. It can withstand extremely high temperatures without decomposing or softening, ensuring that the coating maintains good adhesion and integrity under high temperature conditions. This feature makes the ceramic coating have a wide range of application prospects in high temperature working environments such as steel smelting, aerospace, etc. In the steel smelting process, equipment often faces temperatures of thousands of degrees, and traditional coatings are easy to fail. This inorganic high temperature resistant ceramic coating can stably protect the surface of the equipment and extend the service life of the equipment.

[0037] Second, it improves the corrosion resistance after high-temperature oxidation. In high-temperature environments, materials easily react with oxygen, leading to corrosion. The inorganic resin in the coating can form a dense protective film after high-temperature oxidation, preventing oxygen and other corrosive substances from further corroding the substrate. This is crucial for equipment that is in high-temperature, corrosive environments for a long time. For example, in the chemical industry, some reactors and pipelines need to operate under high temperature and strong corrosion conditions. The use of this ceramic coating can effectively protect the equipment and reduce maintenance and replacement costs.

[0038] Third, the addition of glass powder improves secondary ceramicization, thereby improving hardness, substrate temperature resistance and service life. Glass powder will undergo ceramicization transformation under high temperature to form a hard ceramic layer. This not only increases the hardness of the coating, making it better able to resist wear and scratches, but also further improves the temperature resistance of the substrate. When the coating is applied to the surface of various substrates, after high-temperature treatment, the ceramicization of the glass powder enables the substrate to withstand higher temperatures and extend the service life of the substrate. For example, the use of this coating on automotive engine parts can improve the heat resistance of the engine and reduce failures caused by high temperature. It also increases the wear resistance of the parts and improves the overall performance and reliability of the car.

[0039] In general, this inorganic high-temperature resistant ceramic coating shows outstanding advantages in high temperature resistance, corrosion resistance, hardness and substrate temperature resistance by using inorganic resin, glass powder and other ingredients.

[0040] Further, the process of step S2 specifically includes:

[0041] T1. Fully mixing the glass powder and the high temperature functional filler to obtain a mixed powder;

[0042] T2, heating the mixed powder to 600-650°C within 5-8 minutes, maintaining the target temperature for 1-3 minutes, and then cooling to room temperature;

[0043] T3, heating the cooled mixed powder to 800-900°C within 0.5-1min, maintaining the target temperature for 10s, and then cooling to room temperature;

[0044] T4. Add inorganic resin, high temperature pigment and zinc phosphate, mix and stir evenly, and grind at high speed until the fineness reaches less than 30um.

[0045] Under the above steps, first, the glass powder and the high temperature functional filler are fully mixed and then subjected to staged heating treatment. The first heating process softens the glass powder and promotes its fusion with the high temperature functional filler. The high temperature functional filler sinks into the softened glass powder, laying the foundation for subsequent structural changes. This fusion not only enhances the bonding force between the two, but also enables the coating to better play a synergistic role in subsequent use.

[0046] Then, after cooling to room temperature, the temperature is rapidly increased in a very short time. This sudden increase in temperature causes the gas in the high-temperature functional filler to expand rapidly. Since the high-temperature functional filler is embedded in the glass powder at this time, the gas is injected into the glass powder, causing it to expand and form a hollow structure.

[0047] Glass powder with a hollow structure brings many advantages to coatings. On the one hand, it helps to evenly disperse the subsequent coating ingredients. During the use of the coating, the glass powder with a hollow structure can better suspend the various ingredients, avoiding the precipitation and aggregation of the ingredients, thereby ensuring that the performance of the coating is stable and consistent. In particular, the combination of glass powder and high-temperature functional materials enables the two to be evenly dispersed in the subsequent dispersion process, further improving the overall uniformity of the coating. Whether it is being painted or used in a high-temperature environment, it can ensure that the coatings in various parts have the same high-temperature resistance, corrosion resistance and other properties. On the other hand, this unique structure is also conducive to improving the thermal insulation performance of the coating. The hollow structure can block the transfer of heat to a certain extent, provide better protection for the substrate, enable it to maintain a relatively low temperature in a high-temperature environment, and extend the service life of the substrate. At the same time, good dispersibility also makes the coating easier to operate during the construction process, and can evenly cover the surface of the substrate, improving construction efficiency and quality

[0048] Furthermore, during step T3, an inert gas is introduced into the mixed powder. The input of the inert gas provides conditions for the aeration of the glass powder, prompting it to form a hollow structure. This hollow structure not only improves the uniformity of the dispersion of the coating components, ensuring the consistency of the performance of each part; on the other hand, it enhances the thermal insulation performance of the coating, provides better protection for the substrate, and prolongs its service life.

[0049] Embodiment 2:

[0050] The difference from Example 1 is that in step S1, 60 parts by weight of inorganic resin, 30 parts by weight of high-temperature pigment, 20 parts by weight of glass powder, 20 parts by weight of zinc phosphate, 5 parts by weight of high-temperature functional filler, 0.5 parts by weight of anti-flash rust agent and 2 parts by weight of deionized water are taken.

[0051] Embodiment three:

[0052] The difference from Example 1 is that in step S1, 50 parts by weight of inorganic resin, 25 parts by weight of high-temperature pigment, 15 parts by weight of glass powder, 15 parts by weight of zinc phosphate, 4 parts by weight of high-temperature functional filler, 0.3 parts by weight of anti-flash rust agent and 2 parts by weight of deionized water are taken.

[0053] Under the settings of the above embodiments, in the high temperature resistance test, the substrate coated with the ceramic coating was placed in a high temperature environment, and the temperature was gradually increased to 1000°C and maintained for a period of time. The results showed that the coating on the surface of the substrate remained intact without cracking or peeling. However, the control substrate without the coating began to show obvious damage at around 600°C.

[0054] In the corrosion resistance test, the substrates coated with the coating and the substrates without the coating were placed in a highly corrosive environment at the same time. After one day, the surface of the substrate without the coating showed severe corrosion, while the substrate coated with the ceramic coating showed only slight corrosion marks.

[0055] In the coating uniformity test, multiple samples coated with the coating were tested. It was found that the coating thickness of each sample was uniform and the component distribution was consistent, which fully demonstrated that the coating has good uniform dispersion.

[0056] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "include..." or "comprise..." do not exclude the existence of other elements in the process, method, article or terminal device including the elements. In addition, in this article, "greater than", "less than", "exceed" and the like are understood to exclude the number itself; "above", "below", "within" and the like are understood to include the number itself.

[0057] The above description of the embodiments is to facilitate the understanding and use of the present invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to the embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A pure inorganic high temperature resistant ceramic coating, characterized in that: 40-60 parts by weight of inorganic resin, 20-30 parts by weight of high temperature pigment, 10-20 parts by weight of glass powder, 10-20 parts by weight of zinc phosphate, 3-5 parts by weight of high temperature functional filler, 0.2-0.5 parts by weight of anti-flash rust agent and 1-2 parts by weight of deionized water.

2. A pure inorganic high temperature resistant ceramic coating according to claim 1, characterized in that: 40 parts by weight of inorganic resin, 20 parts by weight of high temperature pigment, 10 parts by weight of glass powder, 10 parts by weight of zinc phosphate, 3 parts by weight of high temperature functional filler, 0.2 parts by weight of anti-flash rust agent and 1 part by weight of deionized water.

3. A pure inorganic high temperature resistant ceramic coating according to claim 1, characterized in that: 60 parts by weight of inorganic resin, 30 parts by weight of high temperature pigment, 20 parts by weight of glass powder, 20 parts by weight of zinc phosphate, 5 parts by weight of high temperature functional filler, 0.5 parts by weight of anti-flash rust agent and 2 parts by weight of deionized water.

4. A pure inorganic high temperature resistant ceramic coating according to claim 1, characterized in that: 50 parts by weight of inorganic resin, 25 parts by weight of high temperature pigment, 15 parts by weight of glass powder, 15 parts by weight of zinc phosphate, 4 parts by weight of high temperature functional filler, 0.3 parts by weight of anti-flash rust agent and 2 parts by weight of deionized water.

5. A method for preparing a pure inorganic high temperature resistant ceramic coating, characterized in that: Includes steps: S1, take 40-60 parts by weight of inorganic resin, 20-30 parts by weight of high temperature pigment, 10-20 parts by weight of glass powder, 10-20 parts by weight of zinc phosphate, 3-5 parts by weight of high temperature functional filler, 0.2-0.5 parts by weight of anti-flash rust agent and 1-2 parts by weight of deionized water; S2. Mix and stir the inorganic resin, high temperature pigment, glass powder, zinc phosphate and high temperature functional filler evenly, and grind them at high speed until the fineness reaches less than 30 um; S3, adding anti-flash rust agent and deionized water, filtering and packaging to obtain the finished product.

6. The method for preparing a pure inorganic high temperature resistant ceramic coating according to claim 5, characterized in that: The process of step S2 specifically includes: T1. Fully mix the glass powder and the high temperature functional filler to obtain a mixed powder; T2, heating the mixed powder to 600-650°C within 5-8 minutes, maintaining the target temperature for 1-3 minutes, and then cooling to room temperature; T3, heating the cooled mixed powder to 800-900°C within 0.5-1min, maintaining the target temperature for 10s, and then cooling to room temperature; T4. Add inorganic resin, high temperature pigment and zinc phosphate, mix and stir evenly, and grind at high speed until the fineness reaches less than 30um.

7. The method for preparing a pure inorganic high temperature resistant ceramic coating according to claim 6, characterized in that: During step T3, an inert gas is introduced into the mixed powder.