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US 3,955,038 AGranted
Hard metal body
AssigneeSandvik Aktiebolag
InventorsJan Nils Lindstrom, Bo Folke Jonsson, Fall Johan Olof William Ohlsson
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Abstract
A sintered hard metal body is provided with a thin wear-resistant surface coating consisting of an outer layer of ceramic oxide and an intermediate layer of carbide or/and nitride.
Claims2
An article consisting of
- 1. a substrate body of sintered cemented metal carbide containing a small quantity of binder metal;
- 2. an intermediate layer of metal selected from the group consisting of metal carbides and metal nitrides;
- and
- 3. a thin wear-resistant surface coating consisting essentially of at least one layer of wear-resistant ceramic oxide,
- the thickness of said surface coating being 0.5- 4.0 .mu.m, and the thickness of said intermediate layer being 2-16 times that of said surface coating.
2 more elements
Dependencies are inferred from the claim text.