Cutting insert and method of making the same
AssigneeSandvik Aktiebolag
InventorsJan Nils Lindstrom, Fall Johan Olof William Ohlsson
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Abstract
The wear resistance and toughness of a cutting insert comprising a ceramic oxide is improved by applying to it a thin surface layer of ceramic oxide, deposited from a gaseous phase, in which surface layer the grains have a size smaller than 1 micron and preferably smaller than 0.5 micron. In effecting the deposition, at least one of the components of the gaseous phase is present therein in the highest concentration possible without formation of powder.
Claims2
A cutting insert for chip-forming machining said insert consisting of a sintered substrate of of at least one wear-resisting ceramic oxide or of wear-resisting ceramic oxide mixed with at least one hard carbide or nitride and binder metal, on which substrate is a wear-resisting ceramic oxide surface layer consisting of an oxide from of the group consisting of Al, Zr, Si, Ca, Mg, Ti and Hf, the surface layer having been deposited from a gaseous phase and having a thickness of 0.5-100 .mu.m, its mean grain size being smaller than 1 .mu.m and essentially smaller than is the mean grain size of the sintered substrate.
Dependencies are inferred from the claim text.