High-strength tungsten carbide material for use in earth-boring bits
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United States of America Patent
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Jan 25, 1994
Grant Date -
N/A
app pub date -
Feb 28, 1992
filing date -
Feb 28, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sintered hard metal compact for use in earth-boring bits comprises 80 to 94% by weight tungsten carbide particles, 5.4 to 18% by weight cobalt particles and 0.6 to 2.0% by weight nickel particles wherein the ratio of cobalt to nickel is approximately 9:1 by weight. These materials are formed according to conventional powder-metallurgy techniques to provide a hard, sintered compact for use in earth-boring bits having superior properties for drilling applications.
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