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A kind of yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof

A technology of silicon carbide fiber and composite material, which is applied in the field of aerospace material preparation to achieve the effects of improving performance, maintaining stability, and realizing crack deflection and stress release

Active Publication Date: 2020-12-29
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 temperature resistance, oxidation resistance and water vapor corrosion resistance of existing ceramic matrix composites need to be improved.

Method used

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  • A kind of yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof
  • A kind of yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof
  • A kind of yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof

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preparation example Construction

[0030] In a first aspect, the present invention provides a method for preparing a silicon carbide fiber-reinforced silicon carbide composite material modified by yttrium silicate, the method comprising the following steps:

[0031] (1) sequentially prepare a layer of yttrium silicate interface layer and a layer of silicon carbide interface layer on the surface of silicon carbide fiber preform (SiC fiber preform), to obtain yttrium silicate modified silicon carbide fiber preform;

[0032] (2) impregnating the yttrium silicate modified silicon carbide fiber preform obtained in step (1) with the carbon precursor solution, and then passing the impregnated yttrium silicate modified silicon carbide fiber preform successively through the curing step and cracking step;

[0033] (3) Repeat step (2) at least once to make a porous silicon carbide fiber preform; and

[0034] (4) The porous silicon carbide fiber prefabricated body obtained in step (3) is subjected to liquid silicon infilt...

Embodiment 1

[0066] ① The third-generation SiC fiber (Tyranno SA) was woven into a 2.5D silicon carbide fiber preform to obtain a silicon carbide fiber preform with a fiber volume fraction of 35%, with a warp density of 8 fibers / cm and a weft density of 3.5 fibers / cm.

[0067] ② Mix 1.3 parts of ethyl orthosilicate, 50 parts of water and 18 parts of ethanol, add concentrated hydrochloric acid, add 6 g of concentrated hydrochloric acid to 1 mole of ethyl orthosilicate, stir for 1 hour; then add 2 parts of yttrium chloride hexahydrate and stir for 2 hours, Add 2 parts of propylene oxide and stir for 20 minutes to obtain a precursor sol solution; put the silicon carbide fiber preform in ① into the precursor sol solution and soak for 10 minutes, take it out and put it in an oven at 80°C for 24 hours; finally take out the dried The silicon carbide fiber preform was heat-treated in a muffle furnace at 1200°C for 1 h, and then taken out, so that yttrium silicate (Y 2 SiO 5 ) interface layer.

...

Embodiment 2

[0074] ① The third-generation SiC fiber (Tyranno SA) was woven into a 2.5D silicon carbide fiber preform to obtain a silicon carbide fiber preform with a fiber volume fraction of 39%, with a warp density of 8 fibers / cm and a weft density of 3.5 fibers / cm.

[0075] ② Mix 1.5 parts of ethyl orthosilicate, 60 parts of water and 20 parts of ethanol, add concentrated hydrochloric acid, add 7 g of concentrated hydrochloric acid to 1 mole of ethyl orthosilicate, stir for 1 hour; then add 3 parts of yttrium chloride hexahydrate and stir for 2 hours, Add 3 parts of propylene oxide and stir for 20 minutes to obtain a precursor sol solution; put the silicon carbide fiber preform in ① into the precursor sol solution and soak for 15 minutes, take it out and put it in an oven at 80°C for 24 hours; finally take out the dried silicon carbide fiber The silicon carbide fiber preform was heat-treated in a muffle furnace at 1200°C for 1 h, and then taken out, so that yttrium silicate (Y 2 Si 2 o...

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Abstract

The invention relates to a yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and a preparation method thereof. The preparation method comprises the following steps: (1) sequentially preparing a yttrium silicate interface layer and a silicon carbide interface layer on the surface of a silicon carbide fiber prefabricated body so as to obtain a yttrium silicate modified silicon carbide fiber prefabricated body; (2) soaking the yttrium silicate modified silicon carbide fiber prefabricated body prepared in the step (1) into a carbon precursor solution, and sequentially carrying out a curing step and a cracking step on the soaked yttrium silicate modified silicon carbide fiber prefabricated body; (3) at least repeating the step (2) once so as to obtaina porous silicon carbide fiber prefabricated body; (4) carrying out a liquid silicon infiltration reaction on the porous silicon carbide fiber prefabricated body prepared in the step (3), thereby obtaining a yttrium silicate modified SiC / SiC composite material. The yttrium silicate modified SiC / SiC composite material provided by the invention has excellent oxidation resistance, temperature resistance, vapor corrosion resistance, and the like, and is excellent in comprehensive property.

Description

technical field [0001] The invention belongs to the technical field of aerospace material preparation, and in particular relates to a yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and a preparation method thereof. Background technique [0002] At present, the high-temperature materials used in aero-engines are mainly high-temperature alloys. Compared with superalloys, the working temperature of silicon carbide fiber reinforced silicon carbide composites (SiC / SiC composites) can be increased by more than 400°C, and the structure weight can be reduced by more than 30%. effective material of choice. The HiperCompTM series SiC / SiC composite materials of General Electric Company (GE) of the United States have been commercialized, can be mass-produced, and have been successfully applied to various types of aero-engines. [0003] SiC / SiC composite material is a kind of fiber toughened ceramic matrix composite material, which general...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/80C04B35/565C04B35/622C04B41/87
CPCC04B35/806C04B35/565C04B35/622C04B41/52C04B41/87C04B2235/3427C04B2235/96C04B41/5024C04B41/4584C04B41/5059
Inventor 宋环君于艺刘伟王鹏杨冰洋金鑫张宝鹏于新民刘俊鹏
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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