High-temperature-resistant coating layer on graphite base material and preparation method of high-temperature-resistant coating layer

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, so as to facilitate industrial production and application, and is not easy Good effect of shedding and air tightness

Active Publication Date: 2020-09-18
江西宁新新材料股份有限公司 +1
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  • Abstract
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  • 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 layer on graphite base material and preparation method of high-temperature-resistant coating layer
  • High-temperature-resistant coating layer on graphite base material and preparation method of high-temperature-resistant coating layer
  • High-temperature-resistant coating layer on graphite base material and preparation method of high-temperature-resistant coating layer

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 layer on a graphite substrate and a preparation method of the high-temperature-resistant coating layer. The preparation method comprises thesteps: firstly, pretreating the surface of a graphite base material, dipping the graphite base material in coating slurry, or directly spraying or brushing the coating slurry on the surface of the graphite base material, carrying out pre-heating treatment on the graphite base material, embedding the graphite base material with embedding powder, and sintering to form the high-temperature-resistantcoating layer on the graphite base material. The high-temperature-resistant coating layer has a good anti-oxidation effect and plays a role in protecting the graphite base material.

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 Applications(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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