C/SiC-ZrB2 composite material and preparation method thereof

Abstract

The invention relates to a C / SiC-ZrB2 composite material and a preparation method thereof. The preparation method comprises the following steps: curing and cracking a precursor to obtain nano ZrB2 / SiCcomplex-phase ultrahigh-temperature ceramic powder; mixing the ultrahigh-temperature ceramic powder with the precursor to prepare ultrahigh-temperature ceramic powder slurry; taking the slurry as animpregnation liquid, and carrying out earlier-stage densification treatment on a C / C composite material; and taking the precursor as an impregnation liquid, and carrying out later densification treatment on the composite material subjected to the early densification treatment to obtain the C / SiC-ZrB2 composite material. The wettability of the precursor, the carbon fiber and the matrix is relatively good, so that the penetration depth is favorably improved; slurry is adopted as impregnation liquid for early densification, the precursor is adopted for direct impregnation in the later stage, andthe uniformity and the densification degree of the composite material are improved on the basis that the impregnation efficiency and the impregnation depth are guaranteed.

Description

technical field [0001] The invention relates to the technical field of C / SiC composite materials, in particular to a C / SiC-ZrB 2 Composite material and its preparation method Background technique [0002] C / SiC composite materials have a series of excellent properties such as low density, high temperature resistance, high specific modulus, high specific strength and thermal shock resistance, and are widely used in the aerospace field. However, the long-term anti-oxidation service temperature of C / SiC composites does not exceed 1650 °C. Because aerospace vehicles not only need to be used normally under the harsh conditions of high speed and ultra high temperature, but also need to have excellent performance of high reliability and long life, this requires aerospace materials to have more excellent and stable performance and corresponding preparation processes. In order to improve the high-temperature oxidation resistance and ablation resistance of C / SiC composites, it is an...

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Problems solved by technology

The inventor found in the research that there are the following problems in the preparation of composite materials by using this process: the impregnation cycle is long: the number of times of the PIP process is generally more than 10 times, resulting in a greatly increased impregnation cycle; the impregnation is more difficult: it is necessary to use assistance such as vacuuming impregnation means to complete the impregnation to ensure that the impregnated material enters the carbon fiber matrix better; the concentration of the impregnated material is relatively large: in order to ensure the densification effect, the impregnated liquid with a large concentration also causes the impregnation depth to be small, the impregnation difficult, and the impregnation Uneven etc.

In addition to the above-mentioned problems in the impregnation stage, the currently used preparation process also has problems such as low densification efficiency, poor densification effect, and uneven distribution of zirconium boride in the matrix.

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