热压Y-α/β-Sialon复相陶瓷的电镜分析

Electron Microscopy Analysis of Hot pressed Y α/β Sialon Cermic Composite

本文用ＴＥＭ，ＨＲＥＭ分析了热压Ｙ－α／β－Ｓｉａｌｏｎ复相陶瓷的组织结构。结果表明长柱状β－Ｓｉａｌｏｎ晶粒与等轴状α－Ｓｉａｌｏｎ晶粒相互交叉结合在一起，在晶界上无晶间相分布，用会聚束电子衍射法可有效地区分α－Ｓｉａｌｏｎ相和β－Ｓｉａｌｏｎ相。电子能量损失谱（ＥＥＬＳ）分析表明在α－Ｓｉａｌｏｎ晶粒中有Ｏ，Ａｌ，Ｙ的固溶，在β－Ｓｉａｌｏｎ晶粒中有Ｏ，Ａｌ的固溶，Ｘ射线能谱（ＥＤＳ）分析表明固溶含量自晶粒中心到边沿增加，在α／β－Ｓｉａｌｏｎ界面达最大值，并分析了α／β－Ｓｉａｌｏｎ复相陶瓷的形成过程。

Microstructure of hot pressed Y α/β Sialon was investigated by TEM,HREM.The results show that the enlongated β Sialon grains combine with equiaxed α Sialon grains closely and no intergranular phase exists in the interface of α/β Sialon.The phases of α Sialon and β Sialon can be effectively distinguished using convergent beam electron diffraction (CBED).The results of EELS show that the α Sialon,β Sialon grains all contain Al,Y,O but the β Sialon grain does not contain Y.The result of EDS indicates that the solubility is increased from core to rim of the grains in either α Sialon or β Sialon.The α/β Sialon ceramic composite formation is also analyzed.