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Spherical‐Impact Damage and Strength Degradation in Silicon Nitrides for Automobile Turbocharger Rotors
Author(s) -
Akimune Yoshio,
Katano Yasushi,
Matoba Kazuo
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.tb07664.x
Subject(s) - materials science , silicon nitride , composite material , silicon , nitride , turbocharger , degradation (telecommunications) , metallurgy , layer (electronics) , mechanical engineering , turbine , engineering , telecommunications , computer science
Spherical‐impact damage to two silicon nitrides is investigated. Gas‐pressure‐sintered silicon nitride exhibits an elastic response to impact by spherical partially stabilized zirconia particles, resulting in Hertzian cone‐crack initiation in the sintered body. Pressureless‐sintered silicon nitride, on the other hand, demonstrated an elastic/plastic response, with median/radical‐crack initiation. These differences in behavior are due to their microstructural differences as well as to the different hardness values of the silicon nitrides in relation to those of the PSZ spheres. The postimpact bend strength of silicon nitrides is also degraded when crack length exceeds the inherent flaw size.