Surface-coated tool member of tungsten carbide based cemented ca

Details Surface-coated tool member of tungsten carbide based cemented ca Surface-coated tool member of tungsten carbide based cemented ca

1990-04-10

1991-11-19

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of inorganic material

511307, 511309, 76DIG11, 407119, 428212, 428336, 428408, 428469, 428699, B32B 1504

Patent

active

050665537

ABSTRACT:
There is disclosed a surface-coated tool member of tungsten carbide based cemented carbide which has a tungsten carbide based cemented carbide substrate and a hard coating formed on the substrate. The hard coating may have one or more layers each of which is made of one material selected from the group consisting of carbide, nitride and oxide of metals in groups IV.sub.A, V.sub.A and VI.sub.A of the Periodic Table; solid solution of said carbide, nitride and oxide; and aluminum oxide. The cobalt content of the substrate in a surface portion at a depth of about 2 .mu.m from a surface thereof is less than that in an interior portion at a depth of about 100 .mu.m from said surface by at least 10%.

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European Search Report, Application No. 90 106 963.3 and Annex.

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