添加Y_2O_3-Al_2O_3烧结助剂的氮化硅陶瓷的超高压烧结  

ULTRAHIGH PRESSURE SINTERING OF SILICON NITRIDE CERAMICS WITH Y_2O_3-Al_2O_3 AS ADDITIVES

作　　者：唐翠霞[1] 唐敬友[1] 姚怀[1] 寇自力[2] 刘雨生[3] 贺红亮[3] 杨世源[1] 

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621010 [2]四川大学原子分子物理研究所,成都610065 [3]中国工程物理研究院流体物理研究所冲击波物理与爆轰物理实验室,四川绵阳621900

出　　处：《硅酸盐学报》2007年第7期828-831,共4页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(50472102);中国工程物理研究院科学技术基金(20010864);西南科技大学引进人才基金(ZK043030);西南科技大学重点学科建设(220-12100013)资助项目

摘　　要：以Y2O3-Al2O3体系为烧结助剂,在5.4～5.7GPa,1570～1770K的高温高压条件下进行了氮化硅陶瓷的超高压烧结研究。用X射线衍射及扫描电镜对烧结样品进行了分析和观察,探讨了烧结温度及压力对烧结的陶瓷样品性能的影响。结果表明:得到的氮化硅由相互交错的长柱状β-Si3N4晶粒组成,微观结构均匀,α-Si3N4完全转变为β-Si3N4。经5.7GPa,1770K且保温15min的超高压烧结,样品的相对密度达99.0%,Rockwell硬度HRA为99,Vickers硬度HV达23.3GPa。Ultrahigh pressure sintering of silicon nitride （Si3N4） ceramics with Y2O3-Al2O3 as additives at 5.4-5.7 GPa and 1 570-1 770 K was studied. The samples were analyzed with X-ray diffraction and scanning electron microscopy. The effects of sintering temperature and pressure on the properties of sintered ceramic samples were investigated. The results show that the sintered samples are composed of elongated β-Si3N4 rod crystals with disordered orientation and have uniform microstructure; α-Si3N4 is transformed to β-Si3N4 completely. The relative density, Rockwell hardness HRA and Vickers hardness Hv of the sample sintered at 5.7 GPa, 1 770 K for 15 rain are 99.0%, 99 and 23.3 GPa, respectively.

关 键 词：氮化硅陶瓷 超高压烧结 力学性能 显微结构 

分 类 号：O771[理学—晶体学]