Diamond-coated hard material, throwaway insert and a process...

Details Diamond-coated hard material, throwaway insert and a process... Diamond-coated hard material, throwaway insert and a process...

B - Operations, Transporting

24

D

B24D 3/18 (2006.01) C04B 41/50 (2006.01) C04B 41/85 (2006.01) C23C 16/02 (2006.01) C23C 16/27 (2006.01)

Patent

CA 2074482

An object of the present invention is to provide a diamond-coated hard material having a high bonding strength to a substrate and a diamond-coated throwaway insert capable of cutting various light alloys such as Al-Si alloys at a high cutting rate for a long time. This object can effectively be at- tained by a diamond-coated hard material comprising a sintered body consisting of Si3N4 as a predominant component, at least a part of the sintered body having a sintered surface at least a part of which is coated with diamond and a diamond-coated throwaway insert having a diamond- or diamond-like carbon- oated layer with a thickness of 0.1 to 200 µ m, deposited from gaseous phase,on the surface of a substrate consisting of Si3N4 as a predominant component, in which the surface state of the substrate is maintained as sintered and a part or whole of the sintered surface is coated with the diamond- or diamond- like carbon-coated layer.

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