| 摘要 |
PURPOSE:To provide a ceramic material having excellent chipping resistance, mirror-polishing workability and compactness and especially suitable as a ceramic substrate for a thin-film magnetic head. CONSTITUTION:The objective ceramic material contains 70-90% (areal ratio on a sliced cross-section of the sintered material) of Al2O3 particles having an average crystal diameter of <=1.0mum and 10-30% of TiC particles having an average particle diameter of <=1.0mum and having a surface layer substituted with an oxycarbide and/or Ti suboxide expressed by TiC1-xOX (0.5<X<1.0). The ceramic material is prodiced by sintering a powdery mixture of (A) 20-40wt.% of TiC particles having an average particle diameter of 0.2-0.87mum and having a surface layer substituted with an oxycarbide and/or Ti suboxide expressed by TiC)1-xOX (0.5<X<1.0) and (B) 60-80wt.% of monodispersed spherical Al2O3 particles having an average particle diameter of 0.1-0.47mum and an aspect ratio of 0.9-1.1. |
