Patent ID: 6881475

Claim:
An amorphous carbon coated tool comprising: a base material consisting of a cemented carbide based on tungsten carbide and having a cobalt content of not more than 12% by mass, wherein said base material has a shape including a cutting edge; an amorphous carbon film disposed over and covering at least said cutting edge of said base material, wherein said amorphous carbon film has a hydrogen content of not more than 5 atomic % and a maximum thickness from 0.05 μm to 0.5 μm at said cutting edge; and an interlayer disposed between said base material and said amorphous carbon film, wherein said interlayer comprises at least one element selected from the group consisting of the elements of Groups IVa, Va, VIa and IIIb of the periodic table and the elements excluding carbon of Group IVb of the periodic table, or at least one carbide of said at least one element, and wherein said interlayer has a thickness of at least 0.5 nm and less than 10 nm.