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Preparation process and application of an anti-oxidation composite coating with gradient composition

A composite coating and anti-oxidation technology, which is applied in the application field of anti-oxidation composite coating for C/SiC composite materials to improve the anti-oxidation performance of C/SiC composite materials, and can solve the problem that the raw materials of the anti-oxidation composite coating are expensive and easy to use. Problems such as micro-cracks and high sintering temperature are generated, and the effects of good thermal expansion coefficient matching and bonding strength, controllable coating composition and thickness, and simple process operation are achieved.

Active Publication Date: 2016-08-17
CHINA BUILDING MATERIALS ACAD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the existing problems of expensive raw materials for anti-oxidation composite coatings for C / SiC composite materials, high equipment requirements in the preparation process, high sintering temperature (requires a temperature above 1600°C), and easy occurrence of microcracks, the present invention provides An anti-oxidation composite coating with a wide range of raw materials and low price, low equipment requirements in the preparation process, low sintering temperature, not easy to produce micro-cracks, good anti-oxidation performance, and a wide temperature range (300-2000 °C)

Method used

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  • Preparation process and application of an anti-oxidation composite coating with gradient composition
  • Preparation process and application of an anti-oxidation composite coating with gradient composition
  • Preparation process and application of an anti-oxidation composite coating with gradient composition

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preparation example Construction

[0031] Preparation of transition layer: C, Si, MO and SiC powders and binders are formulated into water-based slurry, wherein the molar ratio of Si to C is 1.3-2:1 (preferably 1.3:1 or 2:1), The molar ratio of SiC to C is 1-4:1-3 (preferably 2:3, 1:1 or 4:1), the molar ratio of MO to Si is 1:1-3, the binder (see below for specific substances ) The dosage is 20%-30W% of the weight of C, the solid phase content in the water-based slurry is 30-40W% (W / W), and the rest is water; then the slurry is evenly coated on the C / SiC composite matrix material Surface, the coating thickness is less than 2mm, put it in an oven at 40-60°C (preferably 50°C) to dry for 1-3 hours (preferably 2 hours), polish the surface, and then dry it at 1400-1500°C (preferably 1420°C) Sintering under vacuum for 1-3 hours (preferably 2 hours), forming SiC-MOSi on the surface of C / SiC composite matrix material 2 transition layer.

[0032] In the preparation of the above transition layer, the particle size of C...

Embodiment 1-4

[0042] Embodiment 1-4, preparation of anti-oxidation composite coating for C / SiC composite material

[0043] The anti-oxidation composite coating is a composite coating coated on the surface of the C / SiC composite matrix material. The composite coating includes three functional coatings from the inside to the outside, namely a transition layer, an oxygen barrier layer and a surface sealing layer. See figure 1 shown. The preparation process comprises the following steps:

[0044] 1) Coating a transition layer on the surface of the C / SiC composite matrix material: According to the ratio shown in Table 1, C (particle size of 38nm, 35-40μm is acceptable), Si (particle size of 180 mesh, 150-250 mesh Both) and SiC (particle size of 1 μm, 1.5 μm or 38 μm, 1-38 μm are acceptable) and binder polyvinylpyrrolidone (PVP, the amount is 20%-30% of the weight of C) are formulated into water-based slurry, The solid phase content in the water-based slurry is 30-40wt%, and the rest is water, ...

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Abstract

The invention discloses an anti-oxidizing composite coating used in a C / SiC composite material and an application of the coating in enhancement of an anti-oxidizing performance of the C / SiC composite material. The anti-oxidizing composite coating is used for coating a surface of the C / SiC composite basic material and includes three functional coatings, from interior to exterior, a SiC transition layer, an oxygen blocking layer and a surface sealing layer. The anti-oxidizing composite coating can achieve anti-oxidization at both low temperature and high temperature of the C / SiC composite material. A test result proves that the composite coating, when being scoured under an oxy-acetylene flame at 2000 DEG C for 5 min, is higher than 85% in material strength retention rate and is 1.04% in weight loss ratio. A 2.300s wind tunnel experiment proves that the surface of the material is smooth and is free of basic body exposure. In addition, a preparation technology of the anti-oxidizing composite coating is easy to carry out, is low in device requirement and is suitable for being industrially popularized and applied.

Description

technical field [0001] The invention relates to an anti-oxidation composite coating in the field of chemical industry, in particular to an anti-oxidation composite coating for a C / SiC composite material and its application in improving the oxidation resistance of the C / SiC composite material. Background technique [0002] With the continuous development of aerospace technology, more and more types of components need to be prepared by C / SiC composite materials. At present, C / SiC composite materials have been successfully verified on the medium-load static parts of various military and civilian engines. High-temperature and long-life C / SiC composite materials are developing toward practical use, such as applied to integral combustion chambers, integral guides, integral turbines, and exhaust nozzles. The working conditions of these components are different, so the C / SiC composite materials The performance, especially the anti-oxidation performance, puts forward different requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B41/89
Inventor 霍艳丽唐婕陈玉峰刘海林王春朋梁海龙胡传奇
Owner CHINA BUILDING MATERIALS ACAD