【摘要】 三种经过不同温度下热处理的热压氮化硅样品（含5wt％Y₂O₃和2wt％Al₂O₃添加物）,用X射线衍射、X射线微量分析和高分辨率电子显微镜进行了研究。结果表明在热处理后晶界区产生相变化。晶界玻璃相由于热处理而结晶化。更多还原

【Abstract】 Three silicon nitrides（with 5 wt% Y₂O₃, 2 wt% Al₂O₃ additives）, which were subject-ed to different temperature thermo-treatment after hot-pressing, were examined by X-ray microanalysis, X-ray diffraction and high resolution electron microscopy. The resultsshowed that there were phase changes in grain boundaries of the samples during thermo-treatment, and the glassy phase at the grain boundaries was crystallized by thermo-treat-ment.更多还原