高压烧结AlN陶瓷体材料的微观结构分析  

Microstructure analysis of aluminum nitride ceramic material prepared by high-pressure sintering

作　　者：李小雷[1] 马红安[1] 郭玮[1] 李吉刚[2] 刘万强[1] 郑友进[1] 李尚升[1] 贾晓鹏[1] 

机构地区：[1]吉林大学超硬材料国家重点实验室,吉林长春130012 [2]河南理工大学材料科学与工程学院,河南焦作454000

出　　处：《超硬材料工程》2007年第6期30-33,共4页Superhard Material Engineering

基　　金：国家自然科学基金项目(50572032)

摘　　要：用国产六面顶压机在5.0GPa、1200℃～1700℃条件下实现了以稀土氧化物为助剂的AlN陶瓷体的高压烧结。对制备的AlN高压烧结体进行了高压热处理。用SEM对AlN高压烧结体的微观结构进行了表征。研究表明:高压制备陶瓷体材料能够有效降低烧结温度和缩短烧结时间,烧结温度最低温度达到1200℃,可比传统烧结方法降低400℃以上。在5.0GPa/1400℃/50min条件下制备的AlN高压烧结体出现穿晶断裂模式。高压热处理使得晶粒明显长大,形成了等轴晶粒组织。Aluminum nitride ceramics with rare earth oxide as a sintering aid were fabricated under high pressure （5.0 GPa） at a lower temperature （1200-1700℃） in a cubic apparatus （China type）. The characterization of the sinter was determined by SEM. The results show that the sintering temperature and the sintering time can be decreased effectively by using this method. The lowest sintering temperature was 1200℃, which was 400℃ or more lower than that for conventional liquid-phase sintering. Transgranular fracture mode was appeared when the sintering temperature was as low as 1400℃ under 5.0 GPa for 50 min. The microstructure of equant polycrystal formed in AlN sinter heat treated at high pressure.

关 键 词：AIN陶瓷 高压烧结 热处理 显微结构 

分 类 号：TQ174[化学工程—陶瓷工业]