Wear resistant drill bit
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United States of America Patent
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Sep 24, 2002
Grant Date -
Jul 4, 2002
app pub date -
Jan 4, 2001
filing date -
Jan 4, 2001
priority date (Note) -
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Abstract
A wear resistant drill bit of the matrix bodied type has a bit body comprising a tungsten carbide material bound with a binder material, wherein the tungsten carbide material includes at least some tungsten carbide particles of generally spherical shape. The tungsten carbide material includes particles having a relatively hard central core and a softer skin. The skin includes a large proportion of a high temperature phase of tungsten carbide.
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