Thermostable polycrystalline diamond body, method and mold for producing same
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United States of America Patent
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Feb 17, 1987
Grant Date -
N/A
app pub date -
Dec 14, 1984
filing date -
Dec 14, 1984
priority date (Note) -
Expired
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Abstract
A thermostable polycrystalline diamond body is produced by pre-treating the diamond crystals with molten base or salt, mixing the pre-treated diamond crystals with silicon powder or a blend of silicon and one or more substances, subjecting the mixture to a combination of high-pressure and high-temperature and maintaining the pressure and temperature for a period of time. The thermostable polycrystalline diamond body is characterized in having diamond crystals uniformly distributed in the body. The diamond crystals are covered by .beta.-silicon carbide and that the diamond crystals together with .beta.-silicon carbide form an uninterrupted framework throughout the entire body, the interstices of which are filled with elemental silicon or silicon-containing refractory phases. A polygonal graphite mold having walls of equal thickness useful in the production of said thermostable polycrystalline diamond body is also provided.
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