TiC/Al复合材料在锌液中均匀化机理分析

采用自蔓延高温合成（SHS）法制备高TiC颗粒含量的TiC／Al复合材料。利用自制的实验装置研究复合材料中TiC颗粒在静止锌液中的均匀化过程。结果表明：当锌液温度低于铝的熔点时，TiC／Al复合材料置于锌液后，锌向其内部扩散，引起复合材料表层内液相线温度降低，当表层内Al-Zn合金的液相线温度等于或低于锌液温度时，Al-Zn合金便处于熔融状态，TiC颗粒随其一起从TiC／Al复合材料块上脱落，并不断地向锌液内部传输，最终均匀分布在锌液中；而当锌液温度高于铝熔点时，TiC／Al复合材料置入后，锌和铝同时进行扩散，但是当复合材料表面温度达到铝熔点时，铝开始熔化，铝的熔化导致TiC颗粒的脱落，脱落下来的TiC颗粒不断向锌液内部传输，最终均匀分布在锌液中。

Uniformity Mechanism of TiC/Al Composites in Zinc Melt

TiC/Al composites with high TiC particle content is prepared by SHS(Self-propagating High-temperature Synthesis)process.The uniform distribution process of TiC particles in the stationary zinc melt is studied and analyzed by using self-made experimental equipment.The results show that zinc diffuses into the TiC/Al composites after they are placed in the zinc melt at temperatures below the melting point of aluminum,which leads to the decrease of the liquidus temperature of Al-Zn alloy in the surface layer of TiC/Al composites. When the liquidus temperature of Al-Zn alloy is equal to or below the temperature of zinc melt,Al-Zn alloy melts and TiC particles drop with it from the composites and then transfer into the zinc melt and finally they are distributed uniformly in it;while zinc diffuses into the TiC/Al composites as well as aluminum into the zinc melt after the TiC/Al composites are placed in the zinc melt at temperatures upon the melting point of aluminum.When temperature of the TiC/Al composites surface layer reaches to the aluminum melting point,aluminum melts and TiC particles drop together with it from the TiC/Al composites and then transfer into the zinc melt and they are finally distributed uniformly in it.