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Mullite fiber reinforced ceramic matrix composite material and preparation method thereof

A technology of mullite fiber and composite materials, which is applied in the field of mullite fiber reinforced ceramic matrix composite materials and its preparation, can solve the problems of composite material performance degradation, easy oxidation, etc., to improve bonding strength, relieve thermal stress, excellent The effect of antioxidant properties

Active Publication Date: 2022-01-28
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the C / SiC-based composite material contains a large amount of carbon, and the carbon fiber and carbon matrix will be oxidized at high temperature, resulting in a decrease in the performance of the composite material; especially at high temperatures from 1000°C to 1200°C, the composite material is more prone to oxidation

Method used

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  • Mullite fiber reinforced ceramic matrix composite material and preparation method thereof
  • Mullite fiber reinforced ceramic matrix composite material and preparation method thereof
  • Mullite fiber reinforced ceramic matrix composite material and preparation method thereof

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preparation example Construction

[0034] like figure 1 As shown, the present invention provides a kind of preparation method of mullite fiber reinforced ceramic matrix composite material, and this preparation method comprises the steps:

[0035] (1) Preparation on the surface of mullite fiber preform (BN / SiC) n Alternate interface layers to obtain reinforcements containing BN / SiC interface layers; where n represents the number of BN / SiC layers, n≥1 and is a natural number;

[0036] (2) using liquid polycarbosilane as an impregnating liquid, impregnating the reinforcing body comprising the BN / SiC interface layer to obtain a first sample;

[0037] (3) sequentially curing and cracking the first sample to obtain a second sample;

[0038] (4) Repeat steps (2) to (3) at least 5 times to obtain the mullite fiber reinforced ceramic matrix composite material.

[0039] It should be noted that n is 1, 2, 3, 4 or 5, etc., and n is specifically limited according to the actual requirements of the mullite fiber reinforced...

Embodiment 1

[0068] (1) Prepared by chemical vapor deposition method on the surface of mullite fiber preform (sewn preform, fiber volume fraction is 35%) (BN / SiC) 3 Alternating interfacial layers, resulting in reinforcements containing BN / SiC interfacial layers:

[0069] (1.1) The mullite fiber preform is placed in the first atmosphere (the molar ratio of boron trichloride and ammonia is 1:2) including boron trichloride, ammonia, hydrogen and nitrogen, and heated at 700°C , 6kPa under the condition of depositing 20h, obtain the third sample of surface deposition one deck BN layer (the thickness of monolayer BN layer is 200nm);

[0070] (1.2) Place the third sample in a second atmosphere including trichloromethylsilane, argon and hydrogen (the molar ratio of trichloromethylsilane and hydrogen is 1:2), and Under conditions, deposit 30h, obtain the 4th sample of surface depositing a layer of SiC layer (the thickness of single-layer SiC layer is 400nm);

[0071] (1.3) Repeat steps (1.1) to (...

Embodiment 2

[0076] Embodiment 2 is basically the same as Embodiment 1, except that the number of repetitions in step (4) is 8 times.

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Abstract

The invention particularly relates to a mullite fiber reinforced ceramic matrix composite material and a preparation method thereof. The method comprises the following steps: 1) preparing a (BN / SiC)n alternating interface layer on the surface of mullite fibers to obtain a reinforcement body containing the BN / SiC interface layer, wherein n represents the number of layers of BN / SiC, and n is greater than or equal to 1 and is a natural number; (2) dipping the reinforcement body containing the BN / SiC interface layer by using liquid-state polycarbosilane as a dipping solution to obtain a first sample; (3) curing and cracking the first sample in sequence to obtain a second sample; and (4) repeating the steps (2) to (3) at least five times to obtain the mullite fiber reinforced ceramic matrix composite material. The mullite fiber reinforced ceramic-based composite material prepared by the preparation method disclosed by the invention has excellent oxidation resistance.

Description

technical field [0001] The invention relates to the field of thermal structural composite materials, in particular to a mullite fiber reinforced ceramic matrix composite material and a preparation method thereof. Background technique [0002] C / SiC ceramic matrix composites have a series of excellent properties such as low density, high temperature resistance, high specific modulus, high specific strength and thermal shock resistance, and have broad application prospects in the aerospace field. However, the C / SiC-based composite material contains a large amount of carbon, and the carbon fiber and carbon matrix will be oxidized at high temperature, resulting in a decrease in the performance of the composite material; especially at a high temperature of 1000°C to 1200°C, the composite material is more prone to oxidation. Therefore, in view of the above deficiencies, it is necessary to provide a ceramic matrix composite material with excellent oxidation resistance. Contents o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/571C04B35/577C04B35/80C04B35/622C04B35/628
CPCC04B35/571C04B35/80C04B35/622C04B35/62868C04B35/62863C04B35/62884C04B35/62894C04B2235/5228C04B2235/616C04B2235/96C04B2235/9684
Inventor 李晓东朱申霍鹏飞宋环君刘俊鹏刘伟
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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