Manufacture of rotary drill bits
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United States of America Patent
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Jun 2, 1987
Grant Date -
N/A
app pub date -
Apr 1, 1986
filing date -
Apr 2, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of making a rotary drill bit comprises forming a hollow mould for moulding at least a portion of the bit body, packing at least a part of the mould with powdered matrix material, and infiltrating the material with a metal alloy in a furnace to form a matrix, the alloy being a copper based alloy containing phosphorus and being selected to provide an infiltration temperature which is not greater than 850.degree. C. and preferably not greater than 750.degree. C.
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