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Ultra-high temperature anti-oxidation and ablation-resistant layer and preparation method thereof

An anti-oxidation and ablation-resistant technology, applied in the field of ultra-high temperature protective coatings, can solve problems such as poor uniformity of inner hole coatings, high stress of anti-oxidation coatings, and easy cracking

Active Publication Date: 2021-03-30
NO 59 RES INST OF CHINA ORDNANCE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The first purpose of the present invention is to overcome the problems of existing C / C anti-oxidation coatings such as high stress, easy cracking, and poor uniformity of inner hole coatings, and provide a kind of coating with reasonable composition, high bonding strength, low internal stress, and thermal shock resistance. And ultra-high temperature anti-oxidation and ablation resistance layer with excellent oxidation resistance, that is, multi-layer multi-phase composite carbide coating, to improve the ultra-high temperature performance of C / C composite materials, graphite and other materials above 3000K

Method used

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  • Ultra-high temperature anti-oxidation and ablation-resistant layer and preparation method thereof

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Embodiment approach

[0039] As a preferred embodiment of the present invention, the thickness of the (Ta,Hf)C multiphase coating is 5-50 μm; further preferably, the thickness of the metal Ta coating is 3-5 μm.

[0040] According to another aspect of the present invention, a method for preparing an ultra-high temperature anti-oxidation and ablation-resistant layer is provided, comprising the following steps:

[0041] S01, providing pretreated matrix material;

[0042] S02, first prepare (Ta, Hf)C multiphase coating on the surface of the base material, then prepare metal Ta transition coating on the surface of (Ta, Hf)C multiphase coating, alternately deposit multiple times, and finally use (Ta, Hf )C composite coating finishes deposition, and prepares Ta / (Ta, Hf)C multi-layer multi-phase composite coating.

[0043] As a preferred embodiment of the present invention, the pretreated base material is placed in a chemical vapor deposition system; the chemical vapor deposition system includes an inductio...

Embodiment 1

[0056] This embodiment provides a method for preparing a Ta / (Ta, Hf)C multi-layer multi-phase composite coating, comprising the following steps:

[0057] 1. Use 3000 mesh or more sandpaper to smooth the inner surface of the throat lining, clean it with ultrasonic alcohol for more than 20 minutes, and dry it with argon gas protection at 80 degrees Celsius for 30 minutes;

[0058] 2. Place the sample on the bracket 105 of the induction heating deposition furnace 101, pass argon gas into the induction heating deposition furnace 101 and the gasification furnace for 30 minutes to discharge the air in the furnace, and heat the deposition furnace to 1300 °C under the protection of argon gas;

[0059] 3. Put an appropriate amount of tantalum pentachloride and hafnium tetrachloride into a crucible in a vacuum glove box, place the crucible in a gasifier, heat the TaCl5 gasifier to 220°C, and heat the HfCl4 gasifier to 280°C ;

[0060] 4. Feed the carrier gas into the gasification furna...

Embodiment 2

[0068] This embodiment provides a method for preparing a Ta / (Ta, Hf)C multi-layer multi-phase composite coating, comprising the following steps:

[0069] 1. Use 3000 mesh or more sandpaper to smooth the inner surface of the throat lining, clean it with ultrasonic alcohol for more than 20 minutes, and dry it with argon gas protection at 80 degrees Celsius for 30 minutes;

[0070]2. Place the sample on the support 105 of the induction heating deposition furnace 101, pass argon gas into the induction heating deposition furnace 101 and the gasification furnace for 30 minutes to discharge the air in the furnace, and heat the induction heating deposition furnace 101 to 1400 ° C under the protection of argon;

[0071] 3. Put an appropriate amount of tantalum pentachloride and hafnium tetrachloride into a crucible in a vacuum glove box, place the crucible in a gasifier, heat the TaCl5 gasifier to 240°C, and heat the HfCl4 gasifier to 300°C ;

[0072] 4. Feed the carrier gas into the ...

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Abstract

The invention provides an ultra-high temperature antioxidation anti-ablation coating and a preparation method thereof, and relates to the technical field of chemical vapor deposition. The ultra-high temperature antioxidation anti-ablation coating provided by the invention comprises a Ta / (Ta, Hf)C multilayer multiphase composite coating formed by alternately superposing a metal Ta coating and a (Ta, Hf)C complex phase coating. The invention also provides a preparation method of the ultra-high temperature antioxidation anti-ablation coating, and the preparation method comprises the following steps: S01, providing a pretreated base material; and S02, preparing the (Ta, Hf)C complex phase coating on the surface of the base material, preparing a metal Ta transition coating on the surface of the(Ta, Hf)C complex phase coating, performing alternate deposition many times, and finally, finishing deposition with the (Ta, Hf)C complex phase coating to obtain the Ta / (Ta, Hf)C multilayer multiphase composite coating. The Ta / (Ta, Hf)C multilayer multiphase composite coating is suitable for preparing an ultra-high temperature protective coating on inner bore surfaces of graphite, a C / C compositematerial and other bases to improve antioxidation, anti-ablation and thermal shock-resistant performances of the inner bore working surface of a base material.

Description

technical field [0001] The invention relates to the technical field of chemical vapor deposition, and is suitable for preparing ultra-high temperature protective coatings on inner hole surfaces of substrates such as graphite and C / C composite materials. Background technique [0002] C / C composite material has light weight, high specific strength, thermal shock resistance, ablation resistance and good high-temperature mechanical properties. Insufficient, it starts to oxidize at 370°C, and will oxidize rapidly above 500°C, which cannot meet the material performance requirements of the nozzle throat lining under high-temperature flushing conditions. How to solve the problem of easy oxidation at high temperature has become the key to the application of C / C composites in nozzle throat linings. [0003] The anti-oxidation coating technology can provide anti-oxidation ability at higher temperature by blocking the contact of oxygen with the substrate through the coating, which is a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/90
CPCC04B41/52C04B41/90C04B41/5057C04B41/4531C04B41/5133C04B41/524
Inventor 李忠盛丛大龙吴护林何庆兵李立赵子鹏张敏陈海涛
Owner NO 59 RES INST OF CHINA ORDNANCE IND
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