| 摘要 |
PROBLEM TO BE SOLVED: To solve problems that a cutter made of a zirconia sintered body has high strength and toughness, but intends to degrade cutting performance of the cutting edge due to not falling but abrasion because of low hardness and the high toughness, and the tip related to the performance of the cutter is hardly machined sharply even if zirconia has high toughness as ceramic. SOLUTION: The composite zirconia sintered body for the zirconia cutter member contains zirconia ceramics components and at least one kind of ceramics components selected from not more than 50 wt.% of WC, AlN, Al2O3, and SiC. The zirconia ceramics components contain at least one kind of oxides selected from Y2O3, MgO, CaO, and CeO2 in zirconia, and has a part including 5-30 vol.% of single crystal in a part with 3 μm from the tip of the cutting edge. |
