Abstract
AbstractThe effect of the preferred orientation of SiC whiskers (SiCw) in an alumina based ceramic cutting tool material on its fracture behaviour has been studied. During hot pressing, the SiC whiskers tend to be oriented in planes perpendicular to the hot pressing direction (⊥HPD). The fracture toughness measured on the ⊥HPD plane was found to be noticeably higher than that measured on the plane parallel to the HPD (∥ HPD). Cutting tests revealed that the fracture resistance of the tool was dependent on which surface (⊥ or ∥ HPD) was used as the rake face. Fracture behaviour and cutting results are discussed with respect to the stress distributions predicted using a finite element method. It is suggested that, with regard to fracture resistance, the selection of the ∥ HPD plane as the rake face is more favourable.MST/1565
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