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Microstructure and Mechanical Properties of Sinter–Post‐HIPed Si 3 N 4 –SiC Composites
Author(s) -
Yang JianFeng,
Sekino Tohro,
Choa YongHo,
Niihara Koichi,
Ohji Tatsuki
Publication year - 2001
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.1151-2916.2001.tb00669.x
Subject(s) - materials science , composite material , microstructure , indentation , fracture toughness , sintering , toughness , grain growth , flexural strength , bending , grain size
The microstructural evolution and mechanical properties of Si 3 N 4 –SiC composites obtained by the sinter–post‐HIP process were investigated. SiC addition prohibited β‐Si 3 N 4 grain growth; however, the grain growth followed the empirical growth law, with exponents of 3 and 5 for the c ‐ and the a ‐axis directions, respectively. Mechanical properties were strongly influenced by SiC addition and sintering conditions. Short‐crack propagation behavior was measured and analyzed by the indentation‐strength in‐bending (ISB) method. The present composites had high short‐crack toughness, compared with the values for monolithic Si 3 N 4 . The enhanced short‐crack toughness was attributed to crack‐tip bridging by the SiC particles.