Method for uniformly introducing ultrahigh-temperature ceramic component to braided three-dimensional carbon fibers with high content

Abstract

A method for uniformly introducing an ultrahigh-temperature ceramic component to braided three-dimensional carbon fibers with high content. The invention belongs to the field of ultrahigh temperaturestructural materials and solves the problems of non-uniform distribution and low content of the ultrahigh-temperature ceramic component in the similar methods in the prior art. The method includes following steps: 1) mixing ultrahigh-temperature ceramic powder with anhydrous ethanol and polyacrylic acid to obtain ultrahigh-temperature ceramic slurry; 2) injecting the ceramic slurry into interior of the braided carbon fiber via an injection apparatus and performing ultrasonic vibration, and continuously injecting the slurry to complete vibration-assisted slurry injection process; 3) adding theultrahigh-temperature ceramic slurry and a green body to a reactor, performing vacuum impregnation and then ultrasonic vibration to complete vibration-assisted ultrasonic vibration. Through compositeprocess of the vibration-assisted slurry injection process and the vibration-assisted ultrasonic vibration, the ceramic slurry can be completely and uniformly dispersed in carbon fiber frameworks under effect of the ultrasonic high-frequency vibration. The product is high in ceramic content and is short in process period.

Description

technical field [0001] The invention belongs to the field of ultra-high temperature structural materials, and in particular relates to a method for uniformly introducing a high content of ceramics into a three-dimensional carbon fiber braided body. Background technique [0002] In recent years, the demand for high-temperature structural materials that can effectively serve for a long time in an ultra-high temperature environment has become increasingly urgent in the aerospace field. Throughout the current high-temperature structural material system, ultra-high-temperature ceramic materials (mainly including refractory borides, carbides and nitrides of transition metals, such as ZrB 2 , HfB 2 , TaC, HfC, ZrC, HfN, etc., all of which have melting points above 3000°C) have received extensive attention and research due to their excellent high-temperature comprehensive properties. However, as a typical brittle material, ultra-high temperature ceramic materials have low damage t...

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Problems solved by technology

[0003] The present invention aims to solve the problems of uneven distribution of ultra-high-temperature ceramics, low component content and long process cycle in the current method of introducing ultra-high-temperature ceramics into three-dimensional carbon fiber braided bodies, and provides a short process cycle and low preparation cost. A method for uniformly introducing high-temperature ceramic components into a three-dimensional carbon fiber braid

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