摘要
采用反光显微镜和SEM分别对石英结合SiC、莫来石结合SiC和Sialon结合SiC复相材料的基质相及分散相的晶粒与颗粒形貌、相界状态以及气孔形状与分布等显微结构进行了观察与分析。结果表明 :连续基质结合相与SiC颗粒相界面结合较为致密 ;SiC大颗粒中存在的尺寸大至数百微米的开口或闭口气孔 ,是重要的穿晶断裂源 ;较大尺寸的气孔主要位于片状及尖角状的粗颗粒SiC的密堆交叉处及结合相与弥散颗粒相之间的小角度相界结合处 ;基体相中存在的气孔尺寸远小于粗、中SiC颗粒尺度 ,有利于提高材料的抗热震性能。首次用显微硬度仪对SiC复相耐火材料中不同物相的显微硬度进行了测试 ,发现SiC复相材料中不同物相区域的显微硬度值均低于相应物相的单相材料显微硬度值。
The microstructure features of SiC multiphase refractories such as particle shapes or grain growth states of disperse and matrix phases,dimensions and distribution of pores as well as the interface state between the phases were investigated by optical microscope and SEM.The interface between matrix phase and SiC particle bonded tightly.There are open or close pores of dimensions up to 100～300 μm in SiC particles,which are the main origins of transcrystalline fracture.The big pores mainly located at the interlaced areas between SiC particles with sheet or sharp angle shape and matrix phase.The dimensions of pores located in the matrix phase are far smaller than those of SiC particles with moderate or big dimensions, which contribute to high thermal shock resistance.The micro-hardness of SiC dispersion phase and matrix phase in SiC multiphase refractories were determined respectively at first,the results show that the micro-hardness of SiC dispersion and matrix phase is lower than that of corresponding single-phase materials.The influence of the microstructure on the properties of SiC multiphase refractories was discussed which can give some very useful suggestions for the research and production of SiC multiphase refractories.
出处
《耐火材料》
CAS
北大核心
2003年第1期45-47,共3页
Refractories
关键词
碳化硅
显微结构
复相耐火材料
高温陶瓷
Silicon carbide,Microstructure,Refractories,High-temperature ceramics,Multiphase refractories
