抄録
Microstructures of SiC whisker/(Si2N4-4, 8, 12mol%Y2O3 6mol%Al2O3) composite ceramics were examined by high-resolution transmission electron microscope. No evidence of interfacial reaction both between SiC whisker and grain boundary phase and between SiC whisker and Si3N4 was observed, irrespective of Y2O3 content. Therefore, the conclusion in the previous study that the variation of the mechanical properties of SiC whisker/Si3N4 composite ceramics with increasing Y2O3 content was mainly due to the variation or change in the size of acicular Si3N4 grains and the kinds of the grain boundary phase was considered to be correct.
