放电等离子体烧结原位制备SiC-TiC-Ti_3SiC_2复合材料  

In-Situ Fabrication of SiC-TiC-Ti_3SiC_2 Composites by Spark Plasma Sintering

作　　者：张建峰[1] 王连军 江莞 陈立东 吴汀[1] 

机构地区：[1]上海硅酸盐研究所

出　　处：《稀有金属材料与工程》2007年第A01期816-818,共3页Rare Metal Materials and Engineering

基　　金：国家杰出青年基金(50625414);国家自然科学基金(50372078)

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·m1/2,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·m1/2。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。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.

关 键 词：原位反应 SiC-TiC-Ti3SiC2 放电等离子体烧结 

分 类 号：TF124.5[冶金工程—粉末冶金]