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Processing and Mechanical Properties of Dense Si 3 N 4 ‐SiC‐Whisker Composites without Sintering Aids
Author(s) -
Pezzotti Gluseppe,
Tanaka Isao,
Okamoto Taira,
Koizumi Mitsue,
Miyamoto Yoshinari
Publication year - 1989
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.1151-2916.1989.tb07676.x
Subject(s) - whisker , materials science , flexural strength , sintering , composite material , indentation hardness , hot isostatic pressing , fracture toughness , composite number , vickers hardness test , modulus , hot pressing , microstructure
Si 3 N 4 with 20 vol% SiC whisker was fabricated without sintering aids by hot isostatic pressing. Density higher than 99.5% was attained after sintering at 2000°C and 170 MPa for 1 h. Careful mixing procedures and the use of an appropriate amount of a dispersant was found to be effective in avoiding whisker segregation and inhomogeneity. Mechanical properties of the composite were investigated by measurements of flexural strength, microhardness, frature toughness, and Young's modulus as a function of temperature. At room temerature, Vickers microhardness and Young's modulus increased from the matrix value about 20% and 5%, respectively. Toughness was about 30% higher, without reduction in flexural strength, up to 1400Deg;C.