Sithebe
Humphrey Sithebe, Nuffield Springs ZA
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20100287845 | POLYCRYSTALLINE DIAMOND COMPOSITES - The invention is for a polycrystalfine diamond composite material comprising intergrown diamond particles and a binder phase, the binder phase comprising a tin-based intermetallic or ternary carbide compound formed with a metallic solvent/catalyst. The invention extends to a polycrystalline diamond abrasive compact comprising such a composite material and to a tool insert comprising such a diamond abrasive compact. | 11-18-2010 |
Humphrey Sithebe, Springs ZA
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20100199573 | ULTRAHARD DIAMOND COMPOSITES - The invention is for an ultrahard composite material comprising a diamond phase and a binder phase, the binder phase comprising a ternary carbide of the general formula Mx M′y C wherein; M is at least one metal selected from the group consisting of the transition metals and the rare earth metals, M′ is a metal selected from the group consisting of the main group metals or metalloid elements and the transition metals Zn and Cd, x is from 2.5 to 5.0, y is from 0.5 to 3.0 and z is from 0.1 to 1. The invention extends to a diamond abrasive compact comprising such an ultrahard composite material and to a tool comprising such a diamond abrasive compact. | 08-12-2010 |
Humphrey Lungisani Sithebe, Springs ZA
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20150136738 | METHOD OF PROCESSING A BODY OF POLYCRYSTALLINE DIAMOND MATERIAL - A method of processing a polycrystalline diamond (PCD) material having a non-diamond phase comprising a diamond catalyst/solvent and/or one or more metal carbides, comprises leaching an amount of the diamond catalyst/solvent and/or one or more metal carbides from the PCD material by exposing at least a portion of the PCD material to a leaching solution. The leaching solution comprises nitric acid diluted in water, wherein the nitric acid is between around 2 to 5 wt % in the nitric acid and water mixture, and one or more additional mineral acids. | 05-21-2015 |
Humphrey Samkelo Lungisani Sithebe, Springs ZA
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20100285335 | POLYCRYSTALLINE DIAMOND (PCD) MATERIALS - The invention is for a polycrystalline diamond material comprising a first phase of bonded diamond particles and a second phase interspersed through the first phase. The second phase contains vanadium in the form of the metal or vanadium carbide or vanadium tungsten carbide or two or more of these forms and may be present in the polycrystalline diamond material in the range 1 to 8 percent by mass of the material. | 11-11-2010 |
20110072730 | Method for Producing a PCD Compact - A method of producing a composite diamond compact comprising a polycrystalline diamond (PCD) compact bonded to a cemented carbide substrate is provided. The method includes the steps of: providing a PCD table, preferably a PCD table with diamond-to-diamond bonding and a porous microstructure in which the pores are empty of second phase material bringing together the PCD table and a cemented carbide substrate in the presence of a bonding agent to form an unbonded assembly; subjecting the unbonded assembly to an initial compaction at a pressure of at least 4.5 GPa and a temperature below the melting point of the bonding agent for a period of at least 150 seconds; and thereafter subjecting the unbonded assembly to a temperature above the melting point of the bonding agent and a pressure of at least 4.5 GPa for a time sufficient for the bonding agent to become molten and bond the PCD table to the substrate to form a composite diamond compact. | 03-31-2011 |
20120055717 | POLYCRYSTALLINE DIAMOND ELEMENT - An embodiment of a PCD insert comprises an embodiment of a PCD element joined to a cemented carbide substrate at an interface. The PCD element has internal diamond surfaces defining interstices between them. The PCD element comprises a masked or passivated region and an unmasked or unpassivated region, the unmasked or unpassivated region defining a boundary with the substrate, the boundary being the interface. At least some of the internal diamond surfaces of the masked or passivated region contact a mask or passivation medium, and some or ail of the interstices of the masked or passivated region and of the unmasked or unpassivated region are at least partially filled with an infiltrant material. | 03-08-2012 |
20140352228 | METHOD OF PROCESSING POLYCRYSTALLINE DIAMOND MATERIAL - A method of processing a polycrystalline diamond (PCD) material having a non-diamond phase comprising a diamond catalyst/solvent material comprises leaching an amount of the diamond catalyst/solvent from the PCD material by exposing at least a portion of the PCD material to a leaching mixture. The leaching mixture comprises hydrochloric acid and one or more additional mineral acids, the molar concentration of the hydrochloric acid being greater than the molar concentration of the one or more additional mineral acids in the leaching mixture. | 12-04-2014 |
Humphrey Samkelo Lungisani Sithebe, Gauteng ZA
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20150151410 | POLYCRYSTALLINE DIAMOND - A PCD body comprises a skeletal mass of inter-bonded diamond grains defining interstices between them. At least some of the interstices contain a filler material comprising a metal catalyst material for diamond, the filler material containing Ti, W and an additional element M selected from the group consisting of V, Y, Nb, Hf, Mo, Ta, Zr Cr, Zr and the rare earth elements. The content of Ti within the filler material is at least 0.1 weight % and at most 20 weight %. The content of M within the filler material is at least 0.1 weight % and at most 20 weight %, and the content of W within the filler material is at least 5 weight % and at most 50 weight % of the filler material. | 06-04-2015 |