Hard composite and method of making the same
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United States of America Patent
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-
Feb 6, 2001
Grant Date -
N/A
app pub date -
Aug 11, 1995
filing date -
Aug 11, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method of heat treating a sintered body having an exposed surface which has the steps of: providing a sintered body comprised of a hard carbide and a binder, the binder being present in the sintered body at a first binder level and the hard carbide in the sintered body being of a first grain size; placing granules of a sacrificial sintered material in contact with at least one portion of the exposed surface of the sintered body, the sacrificial sintered material comprised of the hard carbide and the binder, the binder being present in the sacrificial sintered material at a second binder level and the hard carbide in the sacrificial sintered material being of a second grain size; and heat treating the sintered body and sacrificial sintered material so as to change the binder content in a surface region of the sintered body.
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