一种热压β-sialon的蠕变和蠕变恢复行为  

CREEP AND CREEP RECOVERY BEHAVIOR OF A HOT-PRESSED β-SIALON

作　　者：林明通[1] 蒋丹宇[1] 汪霖[1] 阮美玲[1] 施剑林[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷和超微结构国家重点实验室

出　　处：《材料研究学报》2002年第1期37-40,共4页Chinese Journal of Materials Research

基　　金：国家自然科学基金资助项目 59772008.

摘　　要：研究了一种以Ｓｍ－黄长石固溶体（Ｍ＇）为晶界相的β－ｓｉａｌｏｎ在温度为１３００℃，应力为１１０～２７０ＭＰａ条件下的四点弯曲蠕变行为，应力指数为１．２．蠕变后试样的显微结构观察表明只在三晶界点出砚蠕变空洞，由此推测扩散调节的晶界滑移是主导蠕变机制．在１３００℃／２００ＭＰａ下的里面变恢复行为归因于残余晶界玻璃相的粘弹性松弛．Creep and creep recovery behavior of a hot-pressed β-sialon with Sm-melilite solid solution as intergranular phase at temperature of 1300° C and stresses of 110-270 MPa were investigated. The results show that the stress exponent of the hot-pressed β-sialon is 1.2 and only the cavities on triple grain junctions are found. It is concluded that the grain boundary sliding accommodated by diffusion is the rate-controlling creep mechanism. Creep recovery under 1300°C and 200 MPa is attributed to viscoelastic relaxation of residual intergranular glass.

关 键 词：Β-SIALON 蠕变 蠕变恢复 陶瓷 应力 晶界滑移 

分 类 号：TQ174.15[化学工程—陶瓷工业]