烧结气氛对氮化铝陶瓷结构与性能的影响  

Effect of sintering atmosphere on the structure and properties of aluminum nitride ceramics

作　　者：孙悦[1] 杜学丽[1] 

机构地区：[1]天津理工大学材料科学与工程学院,天津300384

出　　处：《天津理工大学学报》2010年第6期15-18,共4页Journal of Tianjin University of Technology

基　　金：教育部大学生创新性实验计划(091006005)

摘　　要：以高温自蔓延法合成的氮化铝(AlN)粉末为原料,加入5%Y2O3作为烧结助剂,注射成形后分别在氮气和还原性氮气氛中1850℃常压烧结成AlN陶瓷,研究烧结气氛对AlN陶瓷结构与性能的影响.研究表明,不同气氛中烧结的AlN陶瓷的密度、第二相和热扩散系数有所不同,氮气中烧结的AlN陶瓷的密度、第二相和热扩散系数分别为3.20g·cm-3、钇铝酸盐(Y3Al5O12和Y4Al2O9)和0.559cm2·s-1;还原性氮气氛中烧结的AlN陶瓷的密度、第二相和热扩散系数为3.00g·cm-3、氮化钇(YN)和0.581cm2·s-1.扫描电镜(SEM)分析显示氮气氛中烧结的AlN陶瓷结构均一,而还原性氮气氛中烧结的AlN陶瓷内外结构不一致,容易产生变形.Aluminum nitride（AlN） powders as raw materials synthesized from self-propagating high-temperature synthesis and doped with 5 wt.% Y2O3 were used to fabricated green bodies by employing powder injection molding technique.The obtained green bodies were respectively sintered in nitrogen and reducing nitrogen atmospheres at 1 850 ℃ and atmospheric pressure.The results reveal that sintering atmosphere has significant effect on the microstructure and properties of AlN ceramics.The density,secondary phase and thermal diffusivity of sample sintered in nitrogen are 3.20 g·cm-3,yttrium aluminate（Y3Al5O12 and Y4Al2O9） and 0.559 cm2·s-1,whereas those of sample sintered in reducing nitrogen are 3.00 g·cm-3,yttrium nitride（YN） and 0.581 cm2·s-1.Compared with the sample sintered in reducing nitrogen,the microstructure of sample sintered in nitrogen is more uniform.

关 键 词：氮化铝陶瓷 烧结气氛 热导率 密度 

分 类 号：TB321[一般工业技术—材料科学与工程]