Boron nitride-graphite composite coating

Abstract

The invention discloses a boron nitride-graphite composite coating which is characterized by comprising the following components: boron nitride, graphite, a silane coupling agent, a dispersing agent, deionized water, aluminum oxide, titanium dioxide, zirconium oxide, polytetrafluoroethylene and a rare earth element additive, the invention relates to the technical field of composite coatings, the boron nitride and the graphite are precisely proportioned, and the silane coupling agent, the dispersing agent, the deionized water, the aluminum oxide, the titanium dioxide, the zirconium oxide, the polytetrafluoroethylene and the rare earth element additive are combined, so that excellent oxidation resistance is shown, and a base material can be effectively protected from oxidation damage in a high-temperature environment; secondly, the wear resistance of the coating is high, friction and abrasion can be resisted, and the service life of the base material is prolonged; and thirdly, the anti-permeation performance of the coating is remarkable, permeation of liquid such as water and oil can be prevented, and the base material is protected against corrosion.

Description

Technical Field

[0001] The present invention relates to the technical field of composite coatings, and particularly to a boron nitride-graphite composite coating. Background Art

[0002] In the modern industrial and technological fields, the importance of coating materials is increasing. They can significantly improve the wear resistance, corrosion resistance, heat resistance and other properties of the substrate. Especially in the aerospace, automotive, chemical and other industries, coating materials are of great significance for improving the performance of equipment and extending its service life. Boron nitride (BN) and graphite are both two-dimensional materials with special properties. Boron nitride is known for its high thermal conductivity, high resistivity, good chemical stability and high temperature resistance. Graphite has been applied in many fields due to its excellent electrical conductivity, thermal conductivity and self-lubricating properties. The composite coating technology can combine different materials to give play to the advantages of each material and form a coating with excellent comprehensive properties. This technology can overcome the performance limitations of single materials and meet more complex application requirements.

[0003] Although coatings made of boron nitride and graphite alone or in combination with other materials have been applied to a certain extent, there are still some problems. For example, the oxidation resistance of boron nitride coatings at high temperatures needs to be improved, while graphite coatings are insufficient in terms of wear resistance and anti-permeability. Summary of the Invention

[0004] The purpose of the present invention is to provide a boron nitride-graphite composite coating to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: a boron nitride-graphite composite coating, the composition of the composite coating includes boron nitride, graphite, silane coupling agent, dispersant, deionized water, alumina, titanium dioxide, zirconia, polytetrafluoroethylene and rare earth element additive.

[0006] Preferably, the proportion of the boron nitride is 50%-60% by weight, and the particle size is 100-500 mesh.

[0007] Preferably, the proportion of graphite is 20%-30% by weight, and the particle size is 200-800 mesh.

[0008] Preferably, the proportion of the silane coupling agent is 1%-3% by weight, and the concentration is 0.5%-2%.

[0009] Preferably, the proportion of the dispersant is 1%-3% by weight, and the concentration is 0.5%-2%.

[0010] Preferably, the proportion of the deionized water is 10%-20% by weight percentage, and the purity is above 99.9%.

[0011] Preferably, the proportion of the alumina is 5%-10% by weight percentage, and the particle size is 300-700 mesh.

[0012] Preferably, the proportion of the titanium dioxide is 2%-5% by weight percentage, and the particle size is 400-600 mesh.

[0013] Preferably, the proportion of the zirconia is 3%-7% by weight percentage, and the particle size is 100-300 mesh.

[0014] Preferably, the proportion of the polytetrafluoroethylene is 1%-5% by weight percentage, and the particle size is 1-10 microns. The proportion of the rare earth element additive is 0.1%-1% by weight percentage.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: By precisely proportioning boron nitride and graphite, and combining with silane coupling agent, dispersant, deionized water, alumina, titanium dioxide, zirconia, polytetrafluoroethylene and rare earth element additive, the present invention exhibits excellent oxidation resistance and can effectively protect the substrate from oxidation in high-temperature environments; Secondly, the coating has strong wear resistance, can resist friction and abrasion, and extend the service life of the substrate; Thirdly, the coating has remarkable anti-permeability performance, can prevent the penetration of liquids such as water and oil, and protect the substrate from corrosion; In addition, the addition of alumina, titanium dioxide and zirconia further enhances the hardness and corrosion resistance of the coating; The addition of polytetrafluoroethylene improves the lubricity and non-stickiness of the coating; The introduction of rare earth element additive optimizes the microstructure of the coating and enhances its comprehensive performance; Finally, the preparation method of the coating of the present invention is simple, easy for industrial production, and relatively low in cost, with high economy and practicability, and is suitable for the protection of key components in the fields of aerospace, automotive, chemical industry, electronics, etc. Brief Description of the Drawings

[0016] Figure 1 It is a schematic diagram of the composition structure of the present invention.

[0017] In the figure: 1, boron nitride; 2, graphite; 3, silane coupling agent; 4, dispersant; 5, deionized water; 6, alumina; 7, titanium dioxide; 8, zirconia; 9, polytetrafluoroethylene; 10, rare earth element additive; Detailed Embodiments

[0018] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Please refer to Figure 1 , the present invention provides a boron nitride-graphite composite coating. The composition components of the composite coating include boron nitride 1, graphite 2, silane coupling agent 3, dispersant 4, deionized water 5, alumina 6, titanium dioxide 7, zirconia 8, polytetrafluoroethylene 9, and rare earth element additive 10, forming a multifunctional protective coating.

[0020] Specifically, the proportion of boron nitride 1 is 50%-60% by weight, and the particle size range of boron nitride 1 is 100-500 mesh to ensure the structural stability and thermal conductivity of the coating.

[0021] Specifically, the proportion of graphite 2 is 20%-30% by weight, and the particle size range of graphite 2 is 200-800 mesh to enhance the lubricity and conductivity of the coating.

[0022] Specifically, the proportion of silane coupling agent 3 is 1%-3% by weight, and its concentration is controlled at 0.5%-2% to improve the adhesion between the coating and the substrate.

[0023] Specifically, the proportion of dispersant 4 is 1%-3% by weight, and its concentration is controlled at 0.5%-2% to promote the uniform dispersion of the coating components.

[0024] Specifically, the proportion of deionized water 5 is 10%-20% by weight, and the purity of deionized water 5 reaches more than 99.9% to reduce impurities in the coating and improve the purity and performance of the coating.

[0025] Specifically, the proportion of alumina 6 is 5%-10% by weight, and the particle size range of alumina 6 is 300-700 mesh to enhance the hardness and wear resistance of the coating.

[0026] Specifically, the proportion of titanium dioxide 7 is 2%-5% by weight, and the particle size range of titanium dioxide 7 is 400-600 mesh to improve the corrosion resistance and photocatalytic performance of the coating.

[0027] Specifically, the proportion of zirconia 8 is 3%-7% by weight, and the particle size range of zirconia 8 is 100-300 mesh to enhance the thermal shock resistance and mechanical strength of the coating.

[0028] Specifically, the proportion of polytetrafluoroethylene 9 is 1% - 5% by weight, the particle size of polytetrafluoroethylene 9 is 1 - 10 microns, and the proportion of rare earth element additive 10 is 0.1% - 1% by weight, which act together to optimize the self-lubricity and chemical resistance of the coating.

[0029] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A boron nitride-graphite composite coating, characterized in that: The components of the composite coating include boron nitride (1), graphite (2), a silane coupling agent (3), a dispersant (4), deionized water (5), aluminum oxide (6), titanium dioxide (7), zirconium oxide (8), polytetrafluoroethylene (9) and a rare earth element additive (10).

2. The boron nitride-graphite composite coating according to claim 1, characterized in that: The boron nitride (1) has a weight percentage of 50%-60% and a particle size of 100-500 meshes.

3. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of graphite (2) is 20%-30% by weight, and the particle size is 200-800 meshes.

4. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of the silane coupling agent (3) is 1%-3% by weight, and the concentration is 0.5%-2%.

5. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of the dispersant (4) is 1%-3% by weight, and the concentration is 0.5%-2%.

6. The boron nitride-graphite composite coating according to claim 1, characterized in that: The deionized water (5) has a weight percentage of 10%-20% and a purity of more than 99.9%.

7. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of the aluminum oxide (6) is 5%-10% by weight, and the particle size is 300-700 meshes.

8. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of the titanium dioxide (7) is 2%-5% by weight, and the particle size is 400-600 meshes.

9. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of the zirconium oxide (8) is 3%-7% by weight, and the particle size is 100-300 meshes.

10. The boron nitride-graphite composite coating according to claim 1, characterized in that: The proportion of the polytetrafluoroethylene (9) is 1%-5% by weight, and the particle size is 1-10 microns. The proportion of the rare earth element additive (10) is 0.1%-1% by weight.

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