Method and apparatus for fabrication of cobalt alloy composite inserts
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United States of America Patent
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May 16, 2000
Issued Date -
N/A
app pub date -
May 1, 1998
filing date -
Oct 15, 1996
priority date (Note) -
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Abstract
This disclosure features a process of making a two part drill bit insert, namely, a body portion of hard particles such as tungsten carbide particles mixed in an alloy binding the particles. The alloy preferably comprises 6% cobalt with amounts up to about 10% permitted. The body is sintered into a solid member, and also joined to a PDC crown covering the end. The crown is essentially free of cobalt. The process sinters the crown and body while preserving the body and crown cobalt differences.
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