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Fabrication and Fracture Behavior of Novel SiC Ceramics Having Rodlike Grains
Author(s) -
Kodama Hironori,
Miyoshi Tadahiko
Publication year - 1992
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.1151-2916.1992.tb04224.x
Subject(s) - materials science , fracture toughness , ceramic , silicon carbide , microstructure , sintering , relative density , hot pressing , composite material , hot isostatic pressing , fabrication , pressing , whiskers , metallurgy , medicine , alternative medicine , pathology
A new type of silicon carbide having rodlike grains has been fabricated by hot‐pressing or hot‐pressing followed by hot isostatic pressing using SiC whiskers as the raw powder. Preliminary relationships between sintering conditions and microstructure and fracture toughness of the processed ceramics were established. Ceramics with relative density greater than 98% were prepared at temperatures of 2050°C or greater. The fracture toughness of these ceramics was better than that of ordinary SiC, and its maximum value was 7.3 MPa · m 1/2 . Grain pullout, grain bridging, and crack deflection were considered to be the main operative mechanisms which led to improved fractrue toughness.