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OwnerHongchang Yu, Zhen Yang +2inventors
InventorsHongchang Yu, Zhen Yang, Chaodong Wang, Zhongqing Zai
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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.
A thermostable polycrystalline diamond body comprising about 70% to 99% by weight of diamond crystals with a grit size in the range of about 1 to about 150 microns uniformly distributed therein, the surface of said diamond crystals being covered with .beta.-silicon carbide, and chemically and adherently bonded therewith to form an uninterrupted framework, the interstices of which are filled with elemental silicon which is chemically and adherently bonded to said .beta.-silicon carbide.
A thermostable polycrystalline diamond body comprising about 70% to about 99% by weight of diamond crystals with a grit size in the range of about 1 to about 150 microns uniformly distributed therein, the surface of said diamond crystals being covered with .beta.-silicon carbide and chemically and adherently bonded therewith to form an uninterrupted framework, the interstices of which are filled with a silicon-containing refractory phase chemically and adherently bonded to .beta.-silicon carbide, said silicon-containing refractory phase consisting essentially of elemental silicon and one or more substances selected from the group consisting of a silicide of one or more elemental materials, a solution of one or more elemental materials in silicon, boron carbide and silicon carbide, said elemental material being selected from the group consisting of boron, titanium, nickel, cobalt, zirconium, niobium, molybdenum, vanadium, hafnium, chromium, an element of the lanthanum series of the periodic table and alloys thereof, the total amount of the elemental materials, boron carbide or silicon carbide being less than the content of silicon either in elemental form or in combined form.
A method for preparing a thermostable polycrystalline diamond body comprising the steps of:
Dependencies are inferred from the claim text.