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。
'Mullite-rich' mullite-zirconia ceramic composites have been prepared from reaction sintering of ZrSiO_4/Al_2O_3/SiO_2 mixed powders. The reaction sintering was investigated with respect to the densification and phase development. It has been shown that the added amorphous SiO_2 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.
出处
《真空电子技术》
2005年第4期34-36,47,共4页
Vacuum Electronics
