| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool excellent in chipping resistance and deposition resistance.SOLUTION: In a surface-coated cutting tool, (a) a hard coating layer comprises a composite nitride layer at least represented by (AlTiSi)N (x and y satisfy the following expressions: 0.3≤x≤0.6 and 0.01≤y≤0.1) and having an average layer thickness of 0.5-8.0 μm; (b) in the (Al,Ti,Si)N layer, particulates containing N of 30 atomic% or less and at least one element of Al, Ti and Si disperse and distribute, and cavities contacting the particulates exist; (c) the particulates of 90% or more in a percentage of the number of pieces have the composition represented by AlaTibSicNd (a≤0.3, b≥0.4, c≤0.5, and a+b+c+d=1), and an aspect ratio of a vertical cross sectional shape is 1 to 1.5; and (d) a vertical sectional area ratio A in the (Al,Ti,Si)N layer of the particulate (b) is 0.5-2 area%, and a vertical sectional area ratio B of the cavity satisfies 2≤A/B≤5.SELECTED DRAWING: Figure 2 |
