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通过对Cu B Ti粉末在机械合金化和烧结过程中结构变化的分析 ,研究了Cu B Ti体系原位生成TiB2 的热力学和动力学 ,并建立了反应生成TiB2 的微观反应机制 .结果表明 :在Cu B Ti混合粉末机械合金化的后期及Cu(B ,Ti)粉末加热烧结的前期有TiCu3生成 ;机械合金化的时间对TiCu3生成的开始温度及温度区间有一定的影响 ,随机械合金化时间的延长 ,生成TiCu3的开始温度及温度区间都向低温移动 ;TiB2 主要是靠生成TiCu3时产生的富B相和TiCu3熔解产生的富Ti相的相互扩散产生原位反应生成的 .
The thermodynamics and kinetics of in-situ formation of TiB2 in Cu B Ti system were investigated by analyzing the structural changes of Cu B Ti powder during mechanical alloying and sintering. The microscopic reaction mechanism of TiB2 reaction was established. The results show that TiCu3 was formed at the early stage of mechanical alloying of Cu B Ti powder and Cu (B, Ti) powder at the early stage of sintering. The time of mechanical alloying had a certain influence on the onset temperature and temperature range of TiCu3. The mechanical alloying time , The starting temperature and temperature range of TiCu3 are all shifted to low temperature. TiB2 is mainly produced by in-situ reaction of inter-diffusion of Ti-rich phase produced by the formation of TiCu3-rich B phase and TiCu3.