COATED COMPOUND SINTERED COMPACT, CUTTING TOOL AND CUTTING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a coated compound sintered compact which avoids peeling of a heat resistant film and suppresses propagation of mechanical damage such as a crack through a cubic boron nitride sintered compact.

SOLUTION: The coated compound sintered compact is obtained by coating a compound sintered compact comprising at least cubic boron nitride and a binding material with a heat resistant film, wherein when the mass of the cubic boron nitride is denoted by MA, the mass of aluminum contained in a fluoronitric acid-insoluble aluminum compound in the binding material by MBand the mass of aluminum contained in a fluoronitric acid-soluble aluminum compound by MC, a mass ratio MC/MAis 0.001-0.1 and a mass ratio MB/MCis 0.1-15, and wherein the heat resistant film is formed of a specific compound and has a thickness of 0.5-12 μm.

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