A gel infiltration ceramic modification method for special-shaped parts of c/c composite materials

A technology for composite materials and special-shaped parts, which is applied in the field of ceramic matrix composite material preparation, can solve the problems of deteriorating mechanical properties, cumbersome process, easy to fall off, etc., and achieves the effects of low process cost, simple process operation and small volume shrinkage rate.
CN109608235BActive Publication Date: 2021-10-29NAT UNIV OF DEFENSE TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NAT UNIV OF DEFENSE TECH
Publication Date
2021-10-29

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Abstract

The invention discloses a gel infiltration ceramic modification method for C / C composite special-shaped parts, which includes the following steps: (1) Mix and knead ceramic precursor polymer binder and infiltration agent powder to obtain The sol in which the penetrant powder is evenly dispersed; (2) Coat the sol prepared in step (1) on the surface of the C / C composite special-shaped parts; (3) Apply the C containing sol coating prepared in step (2) / C composite special-shaped parts are heated under vacuum or in an inert atmosphere to solidify the sol and pyrolyze it to form a ceramic aerogel. After the temperature reaches 40 to 100°C above the melting point of the penetrant powder, the heat is maintained to make the gel in The infiltration agent powder is melted and fully infiltrated into C / C composite special-shaped parts to obtain carbon / carbon-ceramic composite special-shaped parts. The method of the present invention has good infiltration effect, the coating is not easy to fall off, the process is simple, and the utilization rate of infiltration materials is high. The mechanical properties of C / C composite special-shaped parts are greatly improved after being modified by this method.
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Description

Technical field

[0001] The invention relates to the technical field of ceramic matrix composite material preparation, and in particular to a gel infiltration ceramic modification method for C / C composite special-shaped parts. Background technique

[0002] C / C composite materials have a series of excellent properties such as high specific strength, high specific modulus and fracture toughness, superior ablation resistance, excellent friction and wear properties, thermal shock resistance and good chemical stability. They are widely used in Manufacturing of throat liners for aero engines and rockets, turbine blade components, space shuttle solid boosters, missile end caps, heat exchangers, heat sinks for high-power electronic devices, etc. As thermal structural materials, C / C composite materials are generally used in high-temperature aerobic environments. However, carbon materials are easily oxidized by air at higher temperatures. Research shows that C / C composite materials be...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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