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用电弧熔炼工艺通过高温液态反应原位合成了Ti3SiC2/TiC复合物。微观组织分析表明,TiC与Ti3SiC2形成复相晶粒结构。随着Si含量的增加,在1100℃,Ti3SiC2/TiC复合物的弯曲强度从177 MPa降到92 MPa;复相晶粒结构和TiC的颗粒增强机制的协同作用是高温弯曲强度提高的主要原因。
In situ synthesis of Ti3SiC2 / TiC composites by high temperature liquid reaction was carried out by arc melting process. Microstructure analysis showed that TiC and Ti3SiC2 formed complex grain structure. The flexural strength of Ti3SiC2 / TiC composites decreases from 177 MPa to 92 MPa at 1100 ℃ with the increase of Si content. The synergistic effect of the composite grain structure and TiC particle strengthening mechanism is the main reason for the increase of flexural strength at high temperature.