Patent ID: 10751806

Abstract:
Provided is a surface-coated cutting tool including: a cutting tool body and a hard coating layer on a surface of the cutting tool body, wherein the hard coating layer includes a complex nitride layer of Al, Cr, Si, and Cu, the complex nitride layer of Al, Cr, Si, and Cu includes a main phase, and CrSi-rich particles and Al-rich particles that are dispersed in the main phase, the main phase satisfies 0.15≤α≤0.40, 0.05≤β≤0.20, 0.005≤γ≤0.05, and 0.45≤x≤0.60, the CrSi-rich particles satisfy 0.20≤α≤0.55, 0.20≤β≤0.55, 0≤γ≤0.10, and 0.02≤x≤0.35, the Al-rich particles satisfy 0.10≤α≤0.25, 0.05≤β≤0.25, 0≤γ≤0.10, and 0.02≤x≤0.35 in a composition formula: (Al1-α-β-γCrαSiβCuγ)1-xNx), and an occupancy area ratio of the CrSi-rich particles having a major axis of 100 nm or more is 0.20 to 2.0 area %; and an occupancy area ratio of the Al-rich particles having a major axis of 100 nm or more is 0.50 to 3.0 area %.