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High temperature resistant coating on graphite substrate and preparation method thereof

A technology of graphite base material and high temperature resistance, applied in the field of graphite, can solve the problems of inability to meet the oxidation resistance requirements of graphite materials, poor bonding between the coating and the substrate, and insufficient air tightness of the coating, which is convenient for industrial production and application, and is not easy Shedding, good airtight effect

Active Publication Date: 2022-02-11
江西宁新新材料股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, on the one hand, the single silicon carbide coating is easy to fall off due to the poor bonding between the coating and the substrate, and on the other hand, the airtightness of the coating is not enough, which cannot meet the oxidation resistance requirements of graphite materials. Coating preparation method for silicon coating anti-oxidation effect

Method used

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  • High temperature resistant coating on graphite substrate and preparation method thereof
  • High temperature resistant coating on graphite substrate and preparation method thereof
  • High temperature resistant coating on graphite substrate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Choose a graphite substrate, polish the surface and perform ultrasonic treatment with absolute ethanol, put it in an oven after the surface is dry, and place it at 100° C. for 2 hours, and wait for use.

[0029] (2) Weigh 5g of polyvinylpyrrolidone as a binder, and dissolve it into 35ml of absolute ethanol for 30min ultrasonic treatment. After completion, add 4g of silicon carbide, 1.5g of hafnium boride, 4g of zirconium boride, 2g of tungsten powder, 0.2 g silicon powder, carry out ultrasonic treatment of 60min, to obtain the slurry of silicon carbide composite coating;

[0030] (3) Put the treated graphite sample into the prepared slurry and perform ultrasonication for 10 minutes, so that the surface is fully adsorbed with a uniform silicon carbide coating material;

[0031] (4) After the graphite sample is taken out from the slurry and left to dry, put it into an oven and carry out a preheating treatment at 100°C;

[0032] (5) Prepare the embedding powder that i...

Embodiment 2

[0035] (1) Choose a graphite substrate, polish the surface and ultrasonically clean it once with acetone and alcohol respectively, and place it in an oven at 60°C for 4 hours until use.

[0036] (2) Weigh 8g of phenolic resin as a binder, and dissolve it into 50ml of absolute ethanol for 30min ultrasonic treatment. After completion, add 6g of silicon carbide, 2.5g of hafnium boride, 5g of zirconium boride, 3g of tungsten powder, 0.5g Silicon powder, add magnets, and carry out magnetic stirring for 60 minutes to obtain the slurry of silicon carbide composite coating;

[0037] (3) Evenly brush the prepared slurry on the surface of the graphite sample, let it stand to dry, then brush again, repeat 2 times, put it into an oven at 200°C after completion, and carry out 1h preheating treatment;

[0038] (4) Prepare the embedding powder that isolates oxygen at high temperature and plays a protective role. Weigh 6g of silicon carbide, 0.5g of carbon powder, 3g of zirconium boride, 0.4g...

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Abstract

The invention provides a high-temperature-resistant coating on a graphite substrate and a preparation method thereof. Firstly, the surface of the graphite substrate is pretreated, and then the graphite substrate is immersed in the coating slurry, or the coating material is directly used The slurry is sprayed or brushed on the surface of the graphite substrate, and then the graphite substrate is preheated. Finally, the graphite substrate is embedded with embedding powder and then sintered to form a high temperature resistant coating on the graphite substrate. The high temperature resistant coating has good oxidation resistance and protects the graphite substrate.

Description

technical field [0001] The invention relates to a high-temperature-resistant coating on a graphite substrate and a preparation method thereof, belonging to the technical field of graphite. Background technique [0002] Graphite has the characteristics of high density and high strength. It is a good high-temperature structural material and can be used as nuclear graphite, electrodes for EDM, structural materials for rocket technology, and aluminum plating. Graphite is widely used in many occasions, especially under high temperature conditions, graphite has good high temperature strength. But its fatal problem is that it is rapidly oxidized in the presence of oxygen, which seriously affects the performance and service life. Therefore, it is necessary to improve the oxidation resistance of graphite. A common practice is to provide a coating on the graphite substrate to improve the oxidation resistance of graphite. [0003] There are some technologies using silicon carbide as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/88
CPCC04B41/88C04B41/5133C04B41/009C04B41/507C04B41/5059C04B41/455C04B41/4539C04B41/0072C04B41/4543C04B35/522
Inventor 陈香萍田家利邓达琴洪文晶李海航李江标邓聪秀
Owner 江西宁新新材料股份有限公司
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