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研究Ti-C-Al-Ni系热爆合成NiAI/TiC的形貌,并进行了热力学分析.结果表明:Ti、C含量对产物形貌有显著影响.当体系中Ti、C含量较少(≤15%)时,TiC和NiAl均为圆球状.随着Ti、C含量的增加,NiAl发生熔化;当Ti、C含量达50%左右,TiC颗粒镶嵌在熔融的NiAl基体上,形成较致密的金属间化合物基复合材料;Ti、C含量进一步增加,TiC颗粒变得粗大且不规则,少量NiAl覆盖于其上.产物形貌实际上是由燃烧反应的绝热温度Tad和瞬时液相量所决定的.随着TiC含量的增加,反应体系的Tad提高,NiAl液相量增加,当Ti、C含量达50%时,合成产物中液相量达到最大.

参考文献

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