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(Nb/C/SiC)n multilayer antioxidation coating and preparation method thereof

An anti-oxidation coating and outermost layer technology, applied in the field of anti-oxidation coating and its preparation, can solve the problems of silicon carbide coating failure, easy peeling of silicon dioxide film, single coating, etc., to improve thermal shock performance , Improving the anti-oxidation performance and preventing the diffusion of oxygen

Active Publication Date: 2015-05-06
TAICANG PAIOU TECH CONSULTING SERVICE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But these coatings all have a common problem: the prepared coating is too single, and under the action of high-temperature air flow erosion, the silicon dioxide film on the surface is easy to peel off, resulting in the exposure of the underlying silicon carbide, which is continuously oxidized and Flaking, which eventually leads to rapid failure of the SiC coating

Method used

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Embodiment

[0018] A (Nb / C / SiC) n The multi-layer anti-oxidation coating is characterized in that it is composed of three materials, SiC layer, C layer and Nb layer, which are laminated successively. Each group of cycles in the repeated stack structure includes four layers of SiC layer, C layer, Nb layer and C layer, and the number of cycles is 3 times. Both sides of the Nb layer are C layers, and both sides of the SiC are C layers. layer, the outermost layer is SiC layer. The thickness of the SiC layer was 20 μm, the thickness of the C layer was 10 μm, and the thickness of the Nb layer was 10 μm.

[0019] The present invention is realized through the following steps:

[0020] (1) A SiC layer is deposited on the surface of graphite or C / C composite materials by chemical vapor deposition; the deposition conditions of the SiC layer are as follows: trichloromethylsilane is the precursor, argon is the dilution gas, and hydrogen is the carrier Gas, deposition temperature 1000°C, deposition ...

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Abstract

The invention discloses a (Nb / C / SiC)n multilayer antioxidation coating and preparation method thereof. The SiC layer, the C layer and the Nb layer three materials are laminated repeatedly in order. Each group of cycle in the repeated lamination structure comprises four layers including a SiC layer, a C layer, a Nb layer and a C layer, and the cycle index is 2-5 times. The SiC layer prepared by a chemical vapor deposition method is alternatively deposited with the C layer, the Nb layer, the C layer and the SiC layer, and the (Nb / C / SiC)n multilayer antioxidation coating is obtained. The coating prepared by the invention has improved antioxidation performance and substantially improved thermal shock performance of coating, and by controlling the deposition time and the deposition frequency, the thickness and layer numbers can be controlled, thereby realizing control of composite coating microstructure.

Description

technical field [0001] The invention relates to an anti-oxidation coating and a preparation method thereof, in particular to a (Nb / C / SiC) n Multilayer anti-oxidation coating and method for preparing same. technical background [0002] The oxidation reaction of C / C composites begins to occur in an oxidizing atmosphere exceeding 450 °C, and the oxidation weight loss will significantly reduce the mechanical properties of the material, thus limiting its application in an oxidizing atmosphere. At present, there are two main types of anti-oxidation measures for C / C composites: (1) Internal protection, modifying the carbon fiber and carbon matrix to improve the high-temperature oxidation resistance of C / C composites. (2) External coating, by applying various coatings on the surface of the material to prevent the contact and diffusion of oxygen-containing gas to improve the high-temperature oxidation resistance of the C / C composite material. The oxidation resistance temperature of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/90
Inventor 陈照峰汪洋
Owner TAICANG PAIOU TECH CONSULTING SERVICE