Microstructure and Grain Boundary Character of Al2O3—Mullite—ZrO2—SiC Ceramic Compostie

Microstructure and grain boundary character of hot pressed binary Al2O3(mullite,ZrO2)-SiC omposites and quaternary Al2O3-mullite-ZrO2-SiC composite were studied by electron microscopy and microanalysis,Results suggest that there exist grain boundary solid solutions due to elemental diffusion near SiC and matrix oxides grain boundaries.