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R‐Curve Behavior of Silicon Nitride Ceramic Reinforced with Silicon Carbide Platelets
Author(s) -
Choi ByungJin,
Kim HyounEe
Publication year - 1998
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.1151-2916.1998.tb02606.x
Subject(s) - materials science , fracture toughness , silicon carbide , composite material , ceramic , microstructure , platelet , silicon nitride , ceramic matrix composite , carbide , flexural strength , hot pressing , fracture mechanics , fracture (geology) , toughness , nitride , layer (electronics) , immunology , biology
Si 3 N 4 ceramics reinforced with SiC platelets were fabricated by hot pressing at 1800°C. The microstructure of the Si 3 N 4 matrix itself was the same with or without the addition of the SiC platelets. However, the mechanical properties of the Si 3 N 4 were changed remarkably by the SiC addition. The fracture toughness and the crack resistance with crack propagation ( R ‐curve behavior) were improved while the fracture strength was decreased slightly by the platelets. Improvement in crack resistance was attributed to the extensive interaction of cracks with the platelets. The reduction in strength, on the other hand, is believed to be due to cracks associated with weak platelet‐matrix interfaces.