摘要
本文通过使用Y2O3、Li2CO3、Dy2O3、CaF2、CaO作为添加剂,研究不同添加剂对注射成型低温烧结AlN提高致密度和热导率的作用。实验结果表明,使用Li2CO3,CaF2和Y2O3作为添加剂,在低温下获得了高热导率的AlN陶瓷。通过研究烧结后AlN微观结构的变化和相成分,讨论了对热导率的影响因素。结果表明,添加Li2CO3-CaF2-Y2O3系统的AlN陶瓷在达到烧结温度前进行了液相重新排布,对AlN晶粒有很好的浸润作用,提高了AlN的致密度,净化了晶格,保证了高的热导率。本实验通过注射成形技术成功地制造了AlN样品。采用Li2CO3,CaF2和Y2O3作为添加剂,在烧结温度为1650℃时获得的最大的AlN陶瓷的热导率为147W·m^-1·K^-1。
Effects of sintering aids on the densification and the thermal conductivity of AlN ceramics at a low sintering temperature were studied by using Y2O3, Li2CO3, Dy2O3, CaF2 and CaO as additives in this paper. The results showed that using Li2CO3, CaF2 and Y2O3 as additives, AlN ceramics with high thermal conductivity were achieved at a low sintering temperature. The varieties occurred in the microstructure and the phase compositions of the sintered AXN ceramics were studied, Furthermore, their effects on the thermal conductivity were also discussed. The results showed that in AlN ceramics adding Li2CO3 - CaF2 -Y2O3, the liquid phase redistributed before the sintering temperature has a good wettability to the AlN grains. This promotes the densification of AlN ceramics and the purification of AlN lattice, thus ensuring the high thermal conductivity, Using Li2 CO3, CaF2 and Y2 O3 as additives, AlN ceramics sintered at 1650℃ with high thermal conductivity 147W·m^-1·K^-1 was obtained.
出处
《中国材料科技与设备》
2006年第2期16-18,32,共4页
Chinese Materials Science Technology & Equipment
基金
国家重点基础研究发展计划(973)项日(TG2000067203)
北京市粉末冶金先进材料与技术重点实验室开放课题(20050427690)
关键词
粉末注射成形
氮化铝
烧结助剂
高热导率
Powder Injection Molding
Aluminum Nitride
Sintering aids
High thermal conductivity