无压烧结反应合成片状TiC晶粒

Reaction Synthesis of TiC Particle by Pressureless Sintering

采用3TiC/Si/0.2Al粉体为原料,通过无压烧结反应合成了片状TiC晶粒。采用XRD、SEM和EDS对试样的物相组成、微观形貌和微区成分进行分析。结果表明,在1100～1200℃、保温2 h,原料反应合成了主相Ti3SiC2,同时含有少量TiC、SiC相;当温度为1300℃时,Ti3SiC2开始明显分解;当温度升至1350℃时,试样中Ti3SiC2完全分解,产物主要由TiC相和少量SiC组成;六方TiC晶粒边长5μm。

TiC particle was synthesized by heat treatment using 3TiC/Si/0.2Al powders. The phase composition and microstructure of the material was characterized by XRD and SEM. The composition of the sample was determined by EDS. The results show that the main phase of the product is Ti3SiC2 at 1100-1200 ℃. In addition, some amounts of TiC and SiC are also synthesized. At 1300℃, Ti3SiC2 begins to decompose. When the temperature reaches 1350℃, Ti3SiC2 totally decomposes into TiC. The product is mainly composed of TiC and small amounts of SiC. The length side of TiC hexagonal particle is 5 μm.