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A kind of cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof

A silicon carbide fiber and composite material technology, which is applied in the field of aerospace material preparation, can solve the problems of limiting material use temperature and service life, performance loss of BN interface layer, performance degradation of composite materials, etc., achieves excellent chemical stability, and realizes cracks Deflection, performance-enhancing effects

Active Publication Date: 2021-08-31
AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] Since the engine is in an ultra-high temperature aerobic environment, the oxidation resistance of the interface layer becomes very important. However, due to the insufficient oxidation resistance of the PyC interface layer and the BN interface layer, the use temperature and service life of the material are limited.
When the PyC interface layer is above 400°C, the performance of the composite material will be reduced due to oxidation, and the performance of the BN interface layer will also be lost in an oxidizing environment above 800°C.
With the improvement of the performance requirements of aero-engines for ceramic matrix composites, the temperature resistance, oxidation resistance and mechanical properties at high temperatures of current ceramic matrix composites need to be further improved.

Method used

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  • A kind of cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof
  • A kind of cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof
  • A kind of cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and preparation method thereof

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preparation example Construction

[0028] The preparation method of the cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material of the present invention comprises the following steps:

[0029] (1) Alternately prepare cerium phosphate interface layer and silicon carbide interface layer on the surface of silicon carbide fiber preform (SiC fiber preform) until it reaches a predetermined thickness or predetermined number of layers, and the cerium phosphate interface layer and silicon carbide interface layer prepared by alternating A modified silicon carbide fiber preform modified by a composite interface layer (cerium phosphate / silicon carbide composite interface layer) composed of an interface layer;

[0030] (2) impregnating the modified silicon carbide fiber preform obtained in step (1) with a carbon precursor solution, and then subjecting the impregnated modified silicon carbide fiber preform to a curing step and a cracking step in sequence;

[0031] (3) Repeat step (2) at ...

Embodiment 1

[0065] ① Weave the second-generation SiC fiber (Hi-Nicalon) 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.

[0066] ②Choose cerium nitrate hexahydrate to form a 0.1mol / L aqueous solution, then add an appropriate amount of sodium phosphate to make the molar ratio of cerium and phosphate radicals 1:1; then add an appropriate amount of polyvinyl alcohol surfactant to make the concentration of polyvinyl alcohol 0.5g / L; then add hydrochloric acid to adjust the pH of the solution to 1, stir evenly to obtain a cerium phosphate precursor solution; put the silicon carbide fiber prefabricated body in ① into the cerium phosphate precursor solution for 15 minutes, take it out and put it in an oven at 140°C to keep the temperature React for 24 hours; finally take out the silicon carbide fiber preform and treat it in an oven at 60° C. for 10 hours...

Embodiment 2

[0074] ① Weave the second-generation SiC fiber (Hi-Nicalon) 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.

[0075] ②Choose CeCl 3 ·7H 2 O is dissolved in deionized water at a concentration of 0.2mol / L, and H is added in a stoichiometric 1:1 ratio 3 PO 4 solution, mixed evenly to obtain a cerium phosphate precursor solution; put the silicon carbide fiber preform in ① into the cerium phosphate precursor solution and soak for 15 minutes, take it out and put it in an oven at 80°C for 16 hours; finally take out the dried silicon carbide The fiber preform was heat-treated at 1350° C. for 2 hours, and then taken out, so that a cerium phosphate interface layer with a thickness of 150 nm was obtained on the surface of the silicon carbide fiber preform.

[0076] ③Move the silicon carbide fiber prefabricated body prepared with the cerium ph...

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Abstract

The invention relates to a cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and a preparation method thereof. The method: (1) alternately prepare cerium phosphate interface layers and silicon carbide interface layers on the surface of the silicon carbide fiber preform until reaching a predetermined thickness or predetermined number of layers to obtain a modified silicon carbide fiber preform; (2) use carbon The precursor solution is impregnated with the modified silicon carbide fiber preform, and then the impregnated modified silicon carbide fiber preform is sequentially subjected to a curing step and a cracking step; (3) repeating step (2) at least once to prepare a porous silicon carbide fiber preform and (4) subjecting the prepared porous silicon carbide fiber preform to liquid silicon infiltration reaction to obtain a cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material. The cerium phosphate modified silicon carbide fiber-reinforced silicon carbide composite material prepared by the invention has excellent oxidation resistance, temperature resistance, thermal shock resistance, etc., excellent comprehensive performance at high temperature, and long service life.

Description

technical field [0001] The invention belongs to the technical field of aerospace material preparation, and in particular relates to a cerium phosphate modified silicon carbide fiber reinforced silicon carbide composite material and a preparation method thereof. Background technique [0002] Aeroengines are known as the jewel in the crown of the industry. At present, the hot-end parts of the engine are made of high-temperature alloy materials, but with the increase in the thrust-to-weight ratio requirements of the engine, this type of material has reached the limit of use. Silicon carbide fiber-reinforced silicon carbide composites (SiC / SiC ceramic matrix composites) are considered to be ideal materials to replace superalloys due to their high strength, low density, and high temperature resistance. The density of SiC / SiC ceramic matrix composites is only one-third of that of superalloy materials, and it can resist higher temperature thermal oxidation environment, which can si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/573C04B35/80C04B35/622C04B35/628C04B38/06
CPCC04B35/573C04B35/622C04B35/62847C04B35/62863C04B35/62884C04B35/62886C04B35/62894C04B38/067C04B2235/96C04B2235/3229C04B2235/428C04B2235/447C04B2235/48C04B2235/614C04B2235/616
Inventor 宋环君于艺刘伟王鹏李晓东杨冰洋金鑫于新民刘俊鹏
Owner AEROSPACE INST OF ADVANCED MATERIALS & PROCESSING TECH
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