Oxidation resistant coating and preparation method thereof

An anti-oxidation coating and coating technology, applied in the field of anti-oxidation coating and its preparation, can solve the problems of high price of rare earth elements, low natural reserves, limited technical application, etc., and achieve excellent anti-oxidation ability and take into account the anti-oxidation performance. and thermal shock resistance, the effect of reducing the rate of oxidative mass loss

Inactive Publication Date: 2019-10-25
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But obviously, the rare earth element lutetium needed in the technical solution is not only expensive, but the most important thing is that the natural reserves are very small, which greatly limits the application of the technology

Method used

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  • Oxidation resistant coating and preparation method thereof

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[0038] For the preparation method of the SiC inner coating, the existing chemical vapor deposition method can be used to deposit the SiC inner coating on the surface of the C / SiC composite material. The present invention does not specifically limit the specific process conditions of the chemical vapor deposition method, as long as it can produce a SiC inner coating with a thickness that meets the requirements, it can be regarded as an available chemical vapor deposition process in the present invention.

[0039] In some preferred embodiments, the SiC-ZrB 2 The thickness of the transition coating is 10-40 μm, which can be any value within this range, for example, it can be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, more preferably 20-30 μm, for example, it can be 20 μm, 21 μm , 22 μm, 23 μm, 24 μm, 25 μm, 26 μm, 27 μm, 28 μm, 29 μm, 30 μm, more preferably 30 μm.

[0040] The SiC-ZrB 2 The transition coating can be prepared as follows:

[0041] Place the C / SiC composite...

Embodiment 1

[0057] (1) The green body is chemically deposited by the CVI process to obtain a porous C / C composite material preform, which is deposited to a density of 1.0g / cm 3 , the densification process uses propylene as the carbon source gas, nitrogen as the carrier gas, and a deposition temperature of 900°C.

[0058] (2) The C / SiC composite material is prepared by a high-temperature infiltration method, the C / C composite material in step (1) is placed in a tooling, and silicon powder is added thereto. Raise the temperature of the C / C composite material to 20°C to 70°C below the melting temperature of silicon, and keep the temperature for 2 hours. Continue to heat up to the infiltration temperature, keep warm, complete the high-temperature infiltration reaction, and obtain the C / SiC composite material.

[0059] (3) The SiC inner coating is prepared by chemical vapor deposition, and the C / C composite material in step (1) is placed in a chemical vapor deposition furnace for SiC depositi...

Embodiment 2

[0066] Preparation method is basically the same as Example 1, except that:

[0067] In step (3), the SiC undercoat layer is formed with a thickness of 20 μm.

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Abstract

The invention relates to an oxidation resistant coating and a preparation method thereof. The oxidation resistant coating is formed on a C/SiC composite material, and the C/SiC composite material is prepared by melting siliconizing; the oxidation resistant coating comprises a SiC inner coating formed on the C/SiC composite material surface with thickness being no more than 30 [mu]m, and a SiC-ZrB2transition coating on the SiC inner coating and a ZrB2-MoSi2-borosilicate outer coating on the SiC-ZrB2 transition coating are formed. When the C/SiC composite material is formed with the oxidation resistant coating provided by the invention, the composite material can resist oxidation for a long time in the temperature range of 600-2000 DEG C, both the oxidation resistant performance and the thermal shock resistant performance are achieved, and the use requirements of an aircraft can be met.

Description

technical field [0001] The invention relates to the technical field of C / C composite materials, in particular to an anti-oxidation coating and a preparation method thereof. Background technique [0002] C / C composite materials have a series of excellent properties such as low density, high specific strength and high fracture toughness, and have been widely used in aviation, aerospace, metallurgy, medical and other fields. However, the preparation cost of C / C composites is high, and the carbon fiber is easily oxidized at high temperature, which severely limits its performance potential. With the continuous development of aerospace technology, high-performance aircraft are developing in the direction of high speed, high pressure resistance and high temperature resistance, which puts forward higher requirements for the oxidation resistance, erosion resistance and ablation resistance of C / C composite materials. The development of its rapid and low-cost preparation technology an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B41/89
CPCC04B41/009C04B41/52C04B41/89C04B35/83C04B41/5059C04B41/4556C04B41/5001C04B41/507C04B41/4558C04B41/5071C04B41/5025
Inventor 于艺宋环君金鑫刘伟王鹏刘俊鹏于新民王涛
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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