| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated WC base super hard alloy cutting tool which is excellent in toughness and defect resistance.SOLUTION: Relating to a surface coated WC base super hard alloy cutting tool in which, with WC base super hard alloy as a base body, a hard coating layer is coated on a base body surface, (a) the WC base super hard alloy has a baking system consisting of a first hard phase made from WC, a second hard phase made from mutual solid solution of at least one kind of carbide selecting from among WC and Ti, Zr, Nb and Ta, nitride, and carbonitride, and binder phase of Co, (b) Co content rate in a region of depth 5-50 μm from base body surface toward the inside of base body is larger than Co content rate inside the base body, (c) an average particle size of the second hard phase present in a depth region at least down to 100 μm from the base body surface toward the inside of the base body is 2-15 μm, (d) W content rate at the phase surface part in the second hard phase present in a depth region at least down to 100 μm from the base body surface to the inside of the base body is 1.5-4 times the W content rate inside the phase. |
