高级检索
无机材料学报

无机材料学报

• 研究论文 • 上一篇    下一篇

不同气氛下烧结的α-Sialon/SiC(w)复合材料

许钫钫; 温树林;大学NORDBERG L-O+   

  1. 中国科学院上海硅酸盐研究所; 上海 200050; +Stockholm University; Stockholm; Sweden
  • 收稿日期:1997-06-10 修回日期:1997-07-18 出版日期:1998-06-20 网络出版日期:1998-06-20

α-Sialon/SiC(w) Composites Sintered in Different Atmosphere

XU Fang-Fang; WEN Shu-Lin; NORDBERG L-O+   

  1. Shanghai Institute of Ceramics; Chinese Academy of Sciences Shanghai 200050 China; +Stockholm University; Stockholm; Sweden
  • Received:1997-06-10 Revised:1997-07-18 Published:1998-06-20 Online:1998-06-20

PDF (PC)

895

摘要： 本工作运用透射电子显微镜（TEM）对N2以及N2＋CO两种不同气氛下制备α－Sialon／SiC（W）复合材料的显微结构进行了观察．实验揭示了两种复合材料具有明显不同的相界结构：N2气氛下制备的材料中，基体与晶须间的界面结合牢固；而在N2＋CO气氛下，由于CO气体与SiC晶须表面发生化学反应生成SiO2；导致相界面上渗入一层很厚的玻璃相．两种相界结构均导致材料性能的下降.本工作提出了改进α－Sialon／SiC（w）复合材料显微结构的几个可能的途径.

关键词: SiC晶须, 复合材料, 烧结气氛, 相界面

Abstract: The microstructures of two α-Sialon/SiC(w) composites sintered in N2 and N2+CO atmosphere respectively, were studied by using TEM, HREM and EDS.
TEM observations revealed quite different interface stuctures in-between those two composites. A strong interfacial bond between α-Sialon matrix and
SiC whisker was observed in the composite sintered in N2, while for the composite prepared in N2+CO, a thick layer of glass was found to be formed at the matrix/whisker
interface. The glass was produced by the reaction between CO gas and the SiC whisker surface. Albeit different interface structures, both composites decreased mechanical
properties because the cracks progressed directly across the whisker rather than circumferentially. Possible processes were proposed in order to improve the mechanical
properties of SiC whisker reinforced α-Sialon composites by tailoring the interface microstructures of the composite.

Key words: SiC whisker, sintering atmosphere, composites, interfaces

中图分类号: