摘要
以AlN粉体为原料,采用无压烧结,选取二元烧结助剂Dy2O3–CaF2在1 800℃氮气气氛下烧结AlN陶瓷,利用Archimedes排水法、X射线衍射、扫描电子显微镜、激光导热分析仪和万能材料试验机对烧结的AlN陶瓷的密度、热性能和力学性能进行了测试,并对AlN陶瓷的物相变化和微观结构进行了表征。结果表明：添加二元烧结助剂Dy2O3–CaF2可以有效促进AlN陶瓷致密化以及晶粒的生长发育,降低AlN陶瓷的烧结温度,改善AlN陶瓷的导热性能。当添加2.5%（质量分数）Dy2O3＋1.5%（质量分数）CaF2在1 800℃氮气气氛下常压烧结2 h时,制备出了晶粒发育良好、结晶良好,相对密度99.6%,热导率169 W/（m·K）,同时具有较高的机械强度的AlN陶瓷。
AlN ceramic was pressureless-sintered in nitrogen at 1 800 ℃ with Dy2O3–CaF2 as binary additives. The density, thermal properties, mechanical and phase change and microstructure of sintered AlN ceramic were characterized by the Archimeds drainage method, X-ray diffraction, scanning electron microscopy, laser thermal conductivity analysis and universal testing machinery. The results show that the binary sintering aids Dy2O3–CaF2 can promote the grain growth and AlN densification, and improve the thermal conductivity of AlN ceramic. AlN ceramic with 2.5%（in mass fraction） Dy2O3＋1.5%（in mass fraction） CaF2 was pressureless-sintered in nitrogen at 1 800 ℃ for 2 h. The relative density and thermal conductivity of AlN ceramic is 99.6% and 169 W/（m·K）, respectively, and AlN ceramic with the growth-well grains has a high mechanical strength.
作者
汪暾
谢建军
戴圣洪
丁毛毛
王宇
施誉挺
周鼎
施鹰
WANG Tun;XIE Jianjun;DAI Shenghong;DING Maomao;WANG Yu;SHI Yuting;ZHOU Ding;SHI Ying(School of Materials Science and Engineering,Shanghai University,Shanghai 200444,China;Shanghai Yuking Chemtech Co,Ltd,Shanghai 200124,China;School of Materials Science and Engineering,Shanghai Institute of Technology,Shanghai 200235,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2018年第6期760-765,共6页
Journal of The Chinese Ceramic Society
基金
上海市科研能力建设项目(14520500300)
关键词
氮化铝陶瓷
烧结助剂
热导率
无压烧结
aluminum nitride ceramic
sintering additives
thermal conductivity
pressureless sintering
