Surface-coated tool member of tungsten carbide based cemented carbide
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United States of America Patent
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-
Nov 19, 1991
Grant Date -
N/A
app pub date -
Apr 10, 1990
filing date -
Apr 12, 1989
priority date (Note) -
Expired
status (Latency Note)
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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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