采用燃烧合成法, 通过调整反应体系成分并控制凝固过程, 成功制备了金属Cr相分布均匀、尺寸可达亚微米级的Cr--Al(Cr)2O3金属陶瓷。研究了聚合物及体系成分对金属陶瓷微观组织和燃烧合成过程的影响. 结果表明,添加聚合物显著降低了Al－Cr2O3－Al2O3体系的引燃温度, 缩短了引燃时间, 并改善了Cr颗粒在陶瓷基体上的分布均匀性。加入稀释剂Al2O3以及Cr2O3过量可细化Cr颗粒, 使Al2O3基体变为Al2O3和Al(Cr)2O3。对燃烧合成熔体施加较低的压力, 获得了致密的Cr--Al(Cr)2O3金属陶瓷, 解决了燃烧合成致密化的问题。
Cr--Al(Cr)2O3 cermets have been successfully produced by combustion synthesis, through changing the composition of reaction system and controlling the solidification process. The microstructures of the cermets were characterized by dispersive sub--micron scale Cr particles in ceramic matrix. The effects of polymer addition and system composition on the microstructure of the cermets and combustion synthesis procedure were investigated. The results show that the igniting temperature and time of Al--Cr2O3--Al2O3 system decrease evidently with polymer addition. Also, the polymer addition could make Cr particles more uniformly distribute in the ceramic matrix. By adding the diluent Al2O3 and excessive Cr2O3, the size of Cr particles could be decreased, and the matrix of the cermets are changed from pure Al2O3 to Al2O3 and (Al, Cr)2O3 mixture. The densification of Cr--Al(Cr)2O3 cermets is achieved by applying a lower pressure on the synthesized melt.
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