摘要
本文测量了ＹＡＧ粉体的ξ电位，通过调节ｐＨ值获得均匀分散的ＹＡＧ水悬浮液．采用非均相沉淀方法获得ＹＡＧ分布均匀的Ａｌ２Ｏ３－ＹＡＧ复合粉体．通过热压烧结得到致密烧结体，ＹＡＧ的加入对烧结温度的影响不大．Ａｌ２Ｏ３－５ｖｏｌ％ＹＡＧ复相陶瓷的抗弯强度为４８５ＭＰａ,断裂韧性为４．２ＭＰａ·ｍ１／２，均高于单相Ａｌ２Ｏ３陶瓷，数据的重复性好于球磨混合所制备的样品．通过ＴＥＭ观察，ＹＡＧ颗粒均匀分布于整个样品中，表明通过非均相沉淀制粉可以获得ＹＡＧ颗粒分布均匀的Ａｌ２Ｏ３－ＹＡＧ复相陶瓷．
Zeta potential of YAG powder was measured, and well-dispersed YAG aqueous sus-pension could be obtained through regulating pH value. Al_2O_3-YAG composite powder containinguniformly distributed YAG was prepared by using the heterogeneous precipitation method. Sintered bodies were gotten by hot-pressing, and addition of YAG influenced little on sintering temperature. Bending strength and fracture toughness of Al_2O_3-5vol%YAG composite were 485MPaand 4.2MPa·m^1/2 respectively. Both were higher than those of monolithic Al_2O_3 ceramics, andthe reliability of values was also better than that of Al_2O_3 ceramics. Through TEM observa-tion, it could be seen that YAG particles were uniformly distributed throughout materials. Itindicated that Al_2O_3-YAG composite with good YAG dispersion could be obtained by using theheterogeneous precipitation method.
出处
《无机材料学报》
SCIE
EI
CAS
CSCD
北大核心
2000年第1期169-173,共5页
Journal of Inorganic Materials
