CERAMIC COMPOSITION AND CUTTING TOOL

摘要

In a ceramic composition mainly composed of alumina (Al 2 O 3 ), tungsten carbide (WC) and zirconia (ZrO 2 ), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (Al 2 O 3 ) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (Al 2 O 3 ) crystal grains are adjacent to each other.