振荡压力烧结氮化硅陶瓷微观形貌及其力学性能  

Microstructure and Mechanical Properties of Silicon Nitride Ceramics Sintered by Oscillatory Pressure Sintering

作　　者：秦笑威 盛利文 李双[3] 谢志鹏 QIN Xiaowei;Sheng Liwen;LI Shuang;XIE Zhipeng(School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333000,Jiangxi,China;Zhuzhou Wanrong New Material Technology Co Ltd,Zhuzhou 412000,Hunan,China;School of Resources and Environmental Engineering,Shandong University of Technology,Zibo 255049,Shandong,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]景德镇陶瓷大学材料学院,江西景德镇333000 [2]株洲万融新材科技有限公司,湖南株洲412000 [3]山东理工大学资源与环境工程学院,山东淄博255049 [4]清华大学材料学院,新型陶瓷与精细工艺国家重点实验室,北京100084

出　　处：《硅酸盐学报》2020年第6期803-809,共7页Journal of The Chinese Ceramic Society

基　　金：国家重点研发计划(2017YFB0310400)。

摘　　要：在氮化硅粉料中引入Al2O3、Y2O3和TiC,采用振荡压力烧结技术制备氮化硅陶瓷材料。研究了不同温度(1700、1725、1750、1775℃)氮化硅的微观形貌、晶粒尺寸的变化及其对氮化硅力学性能的影响。探讨了第二相TiC的加入对粉体致密化及界面结合性能的影响。结果表明:在振荡压力烧结工艺下氮化硅陶瓷在1725℃时即可达到完全致密化并获得高的抗弯强度与硬度,其抗弯强度、Vickers硬度值分别为(1421±59)MPa和(16.1±0.3)GPa。试样晶粒的长径比同样是随着温度的升高先增大后降低,其中,晶粒长径比最大的是1725℃烧结的试样,当温度继续升高至1775℃时,晶粒的长径比下降明显,晶粒粗化。氮化硅的抗弯强度与硬度在温度高于1725℃时开始也随着长径比下降而减小。Si3N4 ceramics were prepared by an oscillating pressure sintering technique when Al2O3,Y2O3 and TiC additives were introduced into Si3N4 powders.The microstructure,grain size and mechanical properties of silicon nitride ceramics at different temperatures(i.e.,1700,1725,1750 and 1775℃)were analyzed.The effect of TiC additive on the particle densification and interface bonding of the ceramics were discussed.The results show that Si3N4 ceramics can be fully densified at 1725℃in the oscillating pressure sintering process,thus obtaining a high bending strength of(1421±59)MPa and the Vickers hardness of(16.1±0.3)GPa,respectively.The aspect ratio of the sample also firstly increases and then decreases with the increase of temperature,and the maximum grain aspect ratio reaches at 1725℃.The aspect ratio decreases and the grains become coarser when the temperature further increases to 1775℃.The flexural strength and the Vickers hardness of silicon nitride decrease with the decrease of length-diameter ratio when the temperature higher than 1725℃.

关 键 词：氮化硅陶瓷 振荡压力烧结 晶粒长径比 抗弯强度 

分 类 号：TQ174.75[化学工程—陶瓷工业]