【摘要】 对热压烧结自动化Ｓｉ３Ｎ４陶瓷的工艺参数诸如助烧剂量、烧结时间和温度等与材料显微组织、相组成及力学性能间的关系进行了研究．在致密化前提下助烧剂量较少时，有利于材料显微组织的均匀化和力学性能的提高．其中，ω（Ｙ２Ｏ３）＋ω（Ａｌ２Ｏ３）＝３．５％＋１．５％为助烧剂时，断裂韧性达９．０４ＭＰａ·ｍ（１／２）．另一方面，适当的助烧剂量与烧结温度对材料的致密化和α－Ｓｉ３Ｎ４到β－Ｓｉ３Ｎ４的相转变又是必要的．更多还原

【Abstract】 The relation between the process parameters such as amount of addition,sintering temperature and time of hot-pressed self-toughening Si3N4 ceramics and the microsturcture,phase structure as well as mechanical properties was studied.It was found that less amount of addition would be beneficial to microstructure homogenization which relates to better mechanical properties when the densification is well-achieved. On the other hand,due amount of addition and sintering temperature are necessary to the densification of materials and full phase transformation of α-Si3N4 into β-Si3N4.The fracture toughness of 9.04MPa.m1/2 was got with the addition w(Y2O3+w (Al2O3)=3.5%+1.5%.更多还原