F-0213 スクラッチ試験によるアルミナセラミックスの微視的破壊機構の解明(S34-3 摩擦磨耗メカニズム)(S34 トライボロジー現象の新しい計測・観察法)

概要

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Scratch tests have been performed on three Alumina ceramics under steadily increasing normal loads up to 200 N. The scratches were made with a Rockwell C diamond indenter. The material's response was investigated by measuring the fluctuations in the tangential force and A.E. signal during scratching and also by scanning electron microscopy (SEM) of the scratches. The materials responded very differently to scratching; one exhibited both plastic and brittle behaviour and the other didn't exhibit plastic behaviour. The fracture behavior was correlated with initial surface roughness and the grain size of ceramics, and the differential of fracture behavior might be explained Sc and Sc^* parameters which are defined as the severity of contact.
2001-08-22