燃烧合成-铸造法制备氧化铝基金属陶瓷的研究

Preparation of Alumina Base Cermets by Combustion Synthesis-casting Method

用燃烧合成 铸造法成功制备了致密度较高的Al2 O3 Cr和Al2 O3 ( Cr2 O3 ) Cr金属陶瓷 ,研究了稀释剂Al2 O3 和Cr2 O3及凝固冷却速度对金属陶瓷显微组织的影响。结果表明 ,添加Al2 O3 或Cr2 O3 稀释剂 ,可有效控制燃烧反应的剧烈程度 ,并形成Cr相和陶瓷基体的共晶组织。在石墨铸型冷却条件下 ,Cr相在陶瓷基体上分布均匀、尺寸细小 ,达到了亚微米级尺度。

The Al_2O_3-Cr and Al_2O_3(-Cr_2O_3)-Cr cermets with higher soundness were successfully fabricated by combustion synthesis -casting method. The influence of Al_2O_3, Cr_2O_3 diluents and solidification cooling rate on microstructure of the cermets was examined. The results showed that Al_2O_3 or Cr_2O_3 addition can effectively control severe combustion reaction, and form the eutectic structure of Cr phase and ceramic matrix. Fine Cr phase with sub-micron scale was uniformly distributed in ceramic matrix in graphite mold.