Abstract
The relationship between critical impact velocities (Vc) on crack initiation and materials properties for silicon nitride having different microstructure was investigated. All silicon nitride ceramics showed Hertzian cone crack at impact over VcH and it showed clear relationship with KIC according to Hertzian cone crack theory, however, the relationship between Young's modulus was not defined clearly. Relative to VcR for ring crack initiation does not show exact relationship between bending strength and Young's modulus. In the silicon nitride having higher KIC, of which included 30-50μm needlelike grains, Hertzian cone crack growth was suppressed from surface ring crack and Hertzian cone crack extension were also suppressed.
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