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 maintaining stability, increasing service life and excellent anti-oxidation performance

Active Publication Date: 2018-12-21
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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  • Yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof
  • Yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof
  • Yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof

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preparation example Construction

[0030] In the first aspect, the present invention provides a preparation method of yttrium silicate modified silicon carbide fiber reinforced silicon carbide composite material, the method includes the following steps:

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

[0032] (2) Impregnating the yttrium silicate modified silicon carbide fiber preform prepared in step (1) with a carbon precursor solution, and then the impregnated yttrium silicate modified silicon carbide fiber preform is sequentially subjected to a curing step and cracking step;

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

[0034] (4) The porous silicon carbide fiber preform prepared in step (3) is subjected to liquid silicon infiltration reacti...

Embodiment 1

[0066] ①Weave the third-generation SiC fiber (Tyranno SA) 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 strands / cm and a weft density of 3.5 strands / cm.

[0067] ② Mix 1.3 parts of ethyl orthosilicate, 50 parts of water and 18 parts of ethanol, add concentrated hydrochloric acid, and add 6g of concentrated hydrochloric acid to 1 mole of ethyl orthosilicate and 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 for 10 minutes, take it out and put it in an oven at 80°C for 24 hours; finally take out the dried all The silicon carbide fiber preform was heat-treated in a muffle furnace at 1200° C. for 1 hour and taken out to obtain a 600nm thick yttrium silicate (Y) on the surface of the ...

Embodiment 2

[0074] ①Weave the third-generation SiC fiber (Tyranno SA) 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, 1 mole of ethyl orthosilicate, add 7g of concentrated hydrochloric acid, and stir for 1h; then add 3 parts of yttrium chloride hexahydrate and stir for 2h, 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 for 15 minutes, take it out and put it in an oven at 80°C for 24 hours; finally take out the dried all 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) with a thickness of 800 nm was obtained on the sur...

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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 operating temperature of silicon carbide fiber reinforced silicon carbide composites (SiC / SiC composites) can be increased by more than 400°C, and the structural weight can be reduced by more than 30%. It is a new generation of aeroengine to achieve high thrust-to-weight ratio and weight reduction. The most effective material. The HiperCompTM series of SiC / SiC composites from General Electric Company (GE) has been commercialized and can be mass-produced, and has also been successfully applied to a variety of aero-engine models. [0003] SiC / SiC composite material i...

Claims

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Application Information

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Patent Type & Authority Applications(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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