摘要
选用SiC作为骨料 ,低熔点陶瓷结合剂和活性C作为成孔剂 ,对不同的烧成温度下多孔陶瓷的基本性能进行了研究。温度的提高使SiC多孔陶瓷的气孔率增大 ,气孔形状逐渐呈不规则变化 ,晶界玻璃相对SiC颗粒的润湿以及在SiC颗粒表面的扩展作用增强 ,提高了对骨料颗粒的粘结作用 ,使瓷体强度提高 ,但晶界玻璃相自身结合强度降低 ;气孔通道在 1 2 40℃烧成温度下多为贯通型 ,1 2 80℃呈网状分布 ,1 32 0℃下多为贯通型且存在大量交联通道 ;大于 1 30 0℃烧成时 ,由于SiC的高温氧化产物参与晶界相反应 ,使局部界面结合强度大大提高 ,出现SiC颗粒拔出断裂现象。
The essential properties of the porous ceramics at the different sintering temperature were studied,using SiC powder as the aggregate and low melting ceramic binder,and the active C the pore former. The porosity of the porous SiC ceramics increased with the increase in temperature,the shape of the pore changed irregularly.The wetting behavior of the boundary glass phase to SiC grains and its extension on the surface of SiC grains were enhanced,which improved the bonding strength among the aggregate particles and the sintered body strength while the self bonding strength of the glass phase decreased. There was every probability of that the pore channels were through type at 1240℃,distributed in network structure at 1280℃ and had large numbers of cross linking channels at 1320℃.The bonding strength in the local interface was improved significantly and the pull out fracture in SiC grains occurred due to the reaction of the high temperature SiC oxided product with boundary phase at ≥1300℃ of sintering temperature.
出处
《硅酸盐通报》
CAS
CSCD
2000年第5期40-43,共4页
Bulletin of the Chinese Ceramic Society
基金
河南省模具
材料工程及装备重点实验室基金
关键词
碳化硅
多孔陶瓷
烧成温度
强度
粘度
晶界相
SiC sintering temperature strength viscosity boundary phase binder
