A quantitative evaluation of microstructure in Si3N4/SiC platelet and participate composites |
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| Authors: | G. Pezzotti B. T. Lee K. Hiraga T. Nishida |
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| Affiliation: | (1) The Institute of Scientific and Industrial Research, Osaka University, Ibaraki, 567 Osaka, Japan;(2) Institute for Materials Research, Tohoku University, Katahira, Aoba-ku, 980 Sendai, Japan;(3) Faculty of Polytechnique Science, Department of Materials Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, 606 Kyoto, Japan |
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| Abstract: | A microstructural evaluation of Si3N4 containing 15–40 vol% SiC platelets or particles is presented. All the composites were fully densified by hot isostatic pressing without external addition of sintering aids. Size, morphology, surface roughness and crystal structures of the SiC phases before and after sintering were compared in order to discuss the structural stability of the reinforcements up to 2050 °C in Si3N4 matrix. Morphology and phase characteristics of the grain boundary are also discussed. In addition, homogeneity and isotropy of the composite bodies were quantitatively examined by image analysis techniques and it was recognized that, for a similar degree of dispersion, the characteristic of three-dimensional randomness could be preserved only at Vf<30% in the composites containing high aspect ratio platelets. |
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