原位生成TiB2/Cu复合材料的研究

通过对Ｃｕ－Ｂ－Ｔｉ粉末在机械合金和烧结过程中结构变化的分析，研究了Ｃｕ－Ｂ－Ｔｉ体系原侠生成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几低温移动

In Situ Formation of Titanium diboride/Copper Composite

Thermodynamics and kinetics are applied to study the in situ formation of titanium diboride in Cu?B?Ti during sintering. Structural transformation of Cu?B?Ti mixed powders occurs during the mechanical alloying process and sintering. A micro mechanism model is developed for analyzing the in situ formation of titanium diboride. It can be shown that the titanium triboride phase is formed at the late stage of ball milling of Cu?B?Ti powders and at the initial stage of sintering of Cu(B, Ti) powders. With prolonged milling time, the starting temperature and the tempetature range for the formation of titanium triboride phase shift to low temperature. The formation of titanium diboride depends mainly on the diffusion and chemical reaction of the B rich phase arising from the formation of titanium triboride and the Ti rich phase due to melting of titanium triboride.