Method of making a fine grained cemented carbide
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United States of America Patent
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app pub date -
Oct 13, 2005
filing date -
Jul 25, 2003
priority date (Note) -
Abandoned
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Abstract
According to the present invention there is provided a method of making a finegrained tungsten carbide--cobalt cemented carbide comprising mixing, milling according to standard practice followed by sintering. By introducing nitrogen at a pressure of more than 0.5 atm into the sintering atmosphere after dewaxing but before pore closure a grain refinement including reduced grain size and less abnormal grains can be obtained.
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