PURPOSE: To provide a ceramic cutting tool which is essentially composed of alumina ceramic sintered body and can cut high hardness material efficiently and with a long life.
CONSTITUTION: Base material is alumina ceramic sintered body which contains at least one kind of titanum carbide, nitride, carbo-nitride or carbo-nitro-oxide of 10-50 weight percent in the matrix of Al2O3. A ceramic cutting tool is composed of this base material and either (1) at least, one of the carbide, the nitride or the carbo-nitride of the alloy of Ti and Al provided on the surface of this base material, or (2) combination of, at least, one of the carbide, the nitride or the carbo-nitride of the alloy of Ti and Al provided on the base material and, at least, one of the carbide, the nitride or the carbo-nitride of Ti, and has a coating layer of 0.2-10μm in thickness.
MORIGUCHI HIDEKI
KOBAYASHI AKINORI
