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Si 3 N 4 /SiC‐Whisker Composites without Sintering Aids: I, Quantitative Evaluation of Microstructure
Author(s) -
Pezzotti Giuseppe,
Tanaka Isao,
Okamoto Taira
Publication year - 1990
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1990.tb06712.x
Subject(s) - whisker , materials science , sintering , whiskers , microstructure , hot isostatic pressing , composite material , monocrystalline whisker , homogeneity (statistics) , composite number , isotropy , silicon carbide , grain size , dispersion (optics) , hot pressing , optics , statistics , physics , mathematics
A microstructural evaluation of Si 3 N 4 with 20 vol% SiC whiskers, fully densified by hot isostatic pressing (HIP) without sintering aids, is presented. The grain size and morphology of the matrix, the whisker aspect ratio after sintering, interfacial bonding, and the structural stability of reinforcement up to 2000°C are discussed. Image analysis provides quantitative information about whisker dispersion and orientation. It is pointed out that a whisker dispersion and orientation. It is pointed out that a whisker composite with a high degree of homogeneity and isotropy can be obtained by optimizing the mixing procedure and using HIP.