【作者】 赵世柯； 赵建东； 肖东梅； 康金生；

【Author】 ZHAO Shi-ke, ZHAO Jian-dong, XIAO Dong-mei, KANG Jin-sheng(Research and Development Center of Microwave Devices and Technology, Instituteof Electronics , Chinese Academy of Sciences , Beijing 100080, China )

【机构】 中国科学院电子学研究所微波器件与技术研究发展中心；

【摘要】 以ZrSiO4/Al2O3/SiO2混合粉体为原料,采用反应烧结工艺,通过添加SiO2与“过量”的Al2O3反应,制备了“富”莫来石的ZrO2/莫来石复相陶瓷材料。添加的无定形SiO2在烧结过程中结晶形成中间产物方石英。方石英的形成和莫来石化反应是阻碍致密化的主要因素。结果表明,该体系的反应烧结坯体的致密化是困难的,抑制SiO2晶化,减小莫来石化体积膨胀带来的不利影响是获得致密烧结体的关键。更多还原

【Abstract】 "Mullite-rich" mullite-zirconia ceramic composites have been prepared from reaction sintering of ZrSiO4/Al2O3/SiO2 mixed powders. The reaction sintering was investigated with respect to the densification and phase development. It has been shown that the added amorphous SiO2 crystallized to cristobalite during reaction sintering. The crystallization, together with mullization, is considered as main reasons for preventing densification. Advanced techniques must be developed to obtain dense compacts.更多还原