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中文摘要：
采用Ti，Si，C以及少量的Al，应用放电等离子体烧结设备，在1350℃烧结得到不含有TiC的SiC—Ti3SiC2复合材料，其中SiC理论体积含量为50％。材料表面气孔率为2．72％。材料的硬度为10．09GPa，断裂韧性为5．66MPa·m^1/2，硬度低的原因是由于材料不够致密。提高烧结温度到1450℃，XRD结果表明材料中有了TiC的存在，这说明提高烧结温度以后，Ti3SiC2发生了分解。但是材料表面气孔率为0．64％，材料的硬度达到了18．07GPa，同时，材料的断裂韧性值达到了6．30MPa·m^1/2。实验表明，仅提高烧结温度100℃，使Ti3SiC2部分分解得到TiC，就能够提高材料的硬度和断裂韧性。
英文摘要：
Using Ti, Si, C and a small quantity of Al as starting materials, SiC-TiC-Ti3SiC2 composites without TiC were fabricated sintered at 1350℃ by spark plasma sintering （SPS）. The SiC volume content of the composite was 50%, its open porosity was 2.72%, Vickers hardness was about 10.09 GPa, and fracture toughness 5.66 MPa.m^1/2. But when the sintering temperature was increased to 1450℃, XRD results showed that TiC appeared, which indicated that Ti3SiC2 decomposed. The open porosity was only 0.64%, the Vickers hardness increased to 18.07 GPa, and fracture toughness was 6.30 MPa.m^1/2. The experimental results indicate that only by increasing the sintering temperature from 1350 to 1450℃, Ti3SiC2 decomposes partly to TiC, which could increase the general properties of the composites.
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