h-BN对SiC-YAG-BN复相陶瓷烧结性能的影响  

Effect of h-BN Content on the Sintering Properties of SiC-YAG-BN Multiphase Ceramics

作　　者：郭兴忠[1,2] 杨辉[1,2] 马奇[1] 李海淼[1] 傅培鑫 高黎华 李志强 

机构地区：[1]浙江大学,浙江杭州310027 [2]浙江大学绿色建材与应用技术工程研究中心,浙江杭州310027 [3]浙江东新密封有限公司,浙江乐清325604

出　　处：《稀有金属材料与工程》2008年第A02期565-567,共3页Rare Metal Materials and Engineering

基　　金：浙江省重大科技项目(2005C11067);浙江省重大科技项目(2006C11184)资助

摘　　要：以YAG为烧结助剂,引入h-BN,采用无压烧结制备出SiC-YAG-BN复相陶瓷,采用XRD,SEM等测试技术分析h-BN的引入对复相陶瓷的致密程度、物相组成、断面形貌的影响。结果表明,随着h-BN的引入,复相陶瓷致密性明显降低,气孔率增加。烧结助剂YAG对h-BN的浸润性差,导致h-BN与YAG和SiC之间弱结合,片状h-BN结构形成支架结构,阻碍复相陶瓷收缩致密,但是能产生裂纹偏转、裂纹消耗及微裂纹等增韧机制。The SiC-YAG-BN multiphase ceramics were pressureless sintered with YAG as sintering addition and h-BN as weak phase. The effects of h-BN content on the bulk density, compositions and microstructure of multiphase ceramics were analyzed by XRD and SEM. The results show that the sintering density of the multiphase ceramics decreases and the porosity increases with the increase of h-BN content. The weak soakage between YAG and h-BN leads to the weak combination among h-BN, SiC and YAG, the h-BN with sheet shape forms bracket structure to restrain the sintering the ceramic; but it achieves the crack deflexion, crack deplete and microcrack to increase the toughness of the ceramic.

关 键 词：碳化硅 复相陶瓷 氮化硼 

分 类 号：TQ174.6[化学工程—陶瓷工业]