Patent ID: 6103357
Filing Date: 2000-08-15
Classification: C23C,Y10T

Abstract:
A cutting tool comprising a body selected from the group consisting of sintered cemented carbide or cermet, ceramic or high speed steel and a wear resistant coating on at least part of the surface of the body, said coating comprising a laminar, multilayered structure of refractory compounds in polycrystalline, non-repetitive form, MX/NX/MX/NX/MX . . . , where the alternating layers MX and NX are composed of metal nitrides or carbides with the metal elements M and N are selected from the group consisting of Ti, Nb, Hf, V, Ta, Mo, Zr, Cr, Al, and W and mixtures therein, wherein the sequence of individual layer thicknesses in said coating has no repeat period but is essentially aperiodic throughout the entire multilayered structure, and where the said individual MX or NX layer thickness is larger than 0.1 nm but smaller than 30 nm and, varies essentially at random, and that the total thickness of said multilayered coating is larger than 0.5 .mu.m but smaller than 20 .mu.m.