摘要
YAG(钇铝石榴石)多晶体在不同制备条件下,对固相反应过程中的物相变化、YAG烧结体透明程度、密度和显微组织进行了观测和分析。结果表明:Y3+的扩散速率是决定固相反应进程的主要因素,将高活性的Y2O3纳米微粒与Al2O3粉均匀混合,可促进固相反应的完成,使获得YAG透明体的烧结温度降低100～200℃,保温时间也显著缩短;气孔和晶界对光的反射和散射是YAG多晶体透光性降低的主要原因,采用真空烧结可提高YAG烧结体的密度,改善晶体结构的均匀度,有利于提高YAG多晶体的透光性。
It was observed and analyzed that phase transformation during the solidstate reaction, transparency, densification and microstructure of YAG polycrystalline sintered under different fabrication conditions. The results show that the diffusion velocity of Y3+ plays an important role during the solidstate reaction. When higher active Y2O3 nanopowders used as the starting materials are uniformly mixed with Al2O3 powders, the solidstate reaction is obviously promoted. The sintering temperature to get transparent YAG ceramics is reduced by 100～200 ℃, and the heating period is also shortened. The reflecting and scattering of pores and grain boundaries to light are main reasons decreasing the transparency of YAG polycrystalline. Improving the densification of vacuumsintered YAG and its homogeneity of crystalline structure is helpful to enhancing the transparency of YAG polycrystalline.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2003年第2期432-436,共5页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50172010)
关键词
钇铝石榴石多晶体
固相反应
制备条件
透光性
烧结
YAG polycrystalline
solid-state reaction
fabrication conditions
transparency
