A kind of high temperature and anti-oxidation coating on the surface of graphite material and its preparation method

A technology of anti-oxidation coating and graphite material, which is applied in the direction of metal material coating process, coating, liquid chemical plating, etc., can solve the problems of loss, uneven coating, non-dense, etc., and achieve good affinity, highly active effect

Active Publication Date: 2022-05-20
江苏材睿科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above two methods use deionized water as the solvent to prepare the coating. Since the surface of the carbon material is not hydrophilic, it is easy to cause uneven coating and loss of coating, resulting in uneven and non-dense final coating.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of the high temperature resistant and oxidation resistant coating on the surface of the graphite material in this embodiment includes the following steps:

[0030] 10 parts of zirconium n-butoxide, 10 parts of triethyl borate, and 5 parts of tantalum ethoxide were weighed and mixed, and then used as a coating solvent.

[0031] 70 parts of silicon carbide (particle size of 1000 nm) and 5 parts of acetylene carbon black (particle size of 50 nm) were weighed and added into the coating solvent, then stirred at high speed for 0.5 hours in an ice-water bath, and then added 1 part of organic The silicon defoamer was continuously stirred for 0.5 hours to obtain a high temperature resistant and antioxidative coating.

[0032] The high temperature resistant and antioxidative coating was coated on the surface of the graphite material to obtain a wet film with a thickness of 2000 μm, and then baked at a low temperature of 95°C for 8 hours.

[0033] The graph...

Embodiment 2

[0039] The preparation method of the high temperature resistant and oxidation resistant coating on the surface of the graphite material in the present embodiment comprises the following steps:

[0040] 25 parts of zirconium n-propoxide, 30 parts of dichlorophenylborane, and 10 parts of tantalum penta-n-butoxide were weighed and mixed, and then used as a coating solvent.

[0041] 100 parts of silicon carbide (particle size of 100 nm) and 30 parts of acetylene carbon black (particle size of 10 nm) were weighed and added into the coating solvent, and then stirred at high speed for 2 hours in an ice-water bath, and then added 3 parts of organic The silicon defoamer was continuously stirred for 1 hour to obtain a high temperature resistant and antioxidative coating.

[0042] The high temperature resistant and antioxidative coating was coated on the surface of the graphite material to obtain a wet film with a thickness of 300 μm, which was then baked at a low temperature of 80° C. f...

Embodiment 3

[0049] The preparation method of the high temperature resistant and oxidation resistant coating on the surface of the graphite material in the present embodiment comprises the following steps:

[0050] 30 parts of zirconocene dichloride, 15 parts of triethylamine borane, and 8 parts of tantalum isopropoxide were weighed and mixed, and then used as a coating solvent.

[0051] 85 parts of silicon carbide (particle size of 500 nanometers) and 15 parts of acetylene carbon black (particle size of 40 nanometers) were weighed and added into the coating solvent, then stirred at high speed for 1 hour in an ice-water bath, and then added 2 parts of organic The silicon defoamer was continuously stirred for 1 hour to obtain a high temperature resistant and antioxidative coating.

[0052] The high temperature resistant and antioxidative coating was coated on the surface of the graphite material to obtain a wet film with a thickness of 1000 μm, and then baked at a low temperature of 90°C fo...

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Abstract

The invention discloses a high-temperature-resistant and anti-oxidation coating on the surface of a graphite material and a preparation method thereof, wherein the preparation method of the high-temperature-resistant and anti-oxidation coating on the surface of a graphite material comprises: taking silicon carbide, an organic zirconium material, and an organic boron material in parts by mass , organic tantalum material, acetylene carbon black and silicone defoamer. The organic zirconium material, the organic boron material and the organic tantalum material are uniformly mixed to obtain a coating solvent. Adding silicon carbide and acetylene carbon black to the coating solvent and adding a silicone defoamer to prepare a high temperature resistant and oxidation resistant coating; coating the high temperature resistant and oxidation resistant coating on the surface of the graphite material and baking at low temperature; Transfer the material to the atmosphere sintering furnace for medium-temperature pyrolysis; adjust the argon atmosphere and temperature in the atmosphere sintering furnace to start the high-temperature carbothermal reduction reaction; carry out high-temperature sintering after the carbothermal reduction reaction; after sintering, the graphite material can be A certain thickness of high temperature and oxidation resistant coating is prepared on the surface.

Description

technical field [0001] The invention belongs to the field of material technology, and in particular relates to a high temperature resistant and oxidation resistant coating on the surface of a graphite material and a preparation method thereof. Background technique [0002] Graphite material has good chemical corrosion resistance, high electrical and thermal conductivity, excellent mechanical properties, and has low density, small thermal expansion coefficient and high thermal stability. Therefore, graphite material is a commonly used high temperature material, which is widely used in aerospace, metal smelting, refractory materials, nuclear power industry, petroleum machinery and many other fields. However, graphite is easily oxidized in a high temperature environment. Although graphite materials can be used in inert or vacuum atmospheres above 2000°C, rapid oxidation begins at temperatures above 500°C in air or oxygen-containing atmospheres. This severely limits its applic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/16C04B41/85
CPCC04B41/85C04B41/507C04B41/5059C04B41/5057C04B41/455C04B41/0072
Inventor 薛文东匡健磊吴佩霞
Owner 江苏材睿科技有限公司
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