Patent ID: 9061397
Filing Date: 2015-06-23
Classification: B23C,B24D,C23C,Y10T

Abstract:
1. A diamond film for cutting-tools formed on a base material, the diamond film characterized in that: at least one or more multilayered film layers [A] are included in which the layers are constituted by layering a film layer [α] having a film thickness of 1 μm or more and 15 μm or less and a film layer [β] having a film thickness of 1 μm or more and 20 μm or less so that the film layer [α] is disposed on the base material side and the film layer [β] is disposed on the surface layer side; the film thickness of the entire film body is set to 4 μm or more and 30 μm or less, and the crystallization of the film layer [α] and the crystallization of the film layer [β] are continuous when the cross-section of the multilayered film layer [A] is observed using a cross-sectional TEM method; the average crystal grain diameter of the film layer [α] measured along an imaginary line parallel to the base material surface is less than that of the film layer [β], and the average crystal grain diameter of the film layer [β] is 0.2 μm or more and 4 μm or less; the break-out section of the film layer [β] is smoother than the break-out section of the film layer [α] when the break-out section of the multilayered film layer [A] is observed using the SEM method; a columnar pattern extended in the thickness direction of the break-out section of the film layer [β] is included; an X value of the film layer [β] is less than an X value of the film layer [α] when a crystal part of the cross section of the multilayered film layer [A] is exposed to an electron beam to carry out electron energy-loss spectroscopy (EELS); the X value of the layer [β] is 0.005 to 0.05; a film layer [B] having a film thickness of the 0.5 μm or more and 10 μm or less is formed on the outermost layer; the average crystal grain diameter of the film layer [B] as measured along an imaginary line parallel to the base material surface when the cross-section is observed using a cross-sectional TEM method is less than that of the film layer [β]; when observed using a SEM method, the break-out section of film layer [B] has more unevenness than the break-out section of the film layer [β]; and the X value of the film layer [B] is greater than the X value of the film layer [β], wherein the electron energy-loss spectrum as measured by EELS is assumed to be the sum of the following four Gaussian functions (1)˜(4): X is defined as Ij/(Ij+Ik), where the peak intensity of J is Ij and the peak intensity of K is Ik when the peaks of the electron energy-loss spectrum are separated.