Patent ID: 6962751

Claim:
An amorphous carbon coated tool comprising: a substrate consisting of a body selected from the group consisting of a cubic boron nitride sintered body, a diamond sintered body, a silicon nitride sintered body, and an aluminum oxide-titanium carbide sintered body; an interlayer disposed directly on said substrate, wherein said interlayer comprises at least one carbide of at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, w, and Si, and wherein said interlayer has a thickness in a range from 0.5 nm to less than 10 nm; and an amorphous carbon film that: is disposed indirectly on said substrate with said interlayer therebetween; covers at least a cutting edge of said substrate; contains at most 5 atomic percent of hydrogen; has a maximum thickness in a range from 0.05 μm to 0.5 μm on a tool edge of said substrate; has a density of up to 3×10 5 particles/mm 2 of macro particles comprising carbon on a surface of said amorphous carbon film; has a peak in a wave number region from 400 cm −1 to 1000 cm −1 in a Raman spectrograph obtained by Raman spectroscopy using an argon ion laser with a wavelength of 514.5 nm; is transparent in a visible light range; and exhibits an interference color selected from the group consisting of reddish purple, purple, bluish purple, blue, Silver, yellow, red and green.