Diamond grains, method for making same and mixture comprising same

A method of providing substantially euhedral diamond grains of a mean size of 5 -100 microns. The method includes providing a synthesis assembly comprising: a source of carbon material, a plurality of seed grains on which diamond material can crystallise, and solvent-catalyst material for promoting...

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Bibliographische Detailangaben
Hauptverfasser:	DALE ANTONY THOMSON, MARK GREGORY MUNDAY, MHLONISHWA CYPRIAN NZAMA
Format:	Patent
Sprache:	eng
Schlagworte:	AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE APPARATUS THEREFOR CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOUNDS THEREOF CRYSTAL GROWTH INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE REFINING BY ZONE-MELTING OF MATERIAL SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE SINGLE-CRYSTAL-GROWTH THEIR RELEVANT APPARATUS TRANSPORTING UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL
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Beschreibung
Zusammenfassung:	A method of providing substantially euhedral diamond grains of a mean size of 5 -100 microns. The method includes providing a synthesis assembly comprising: a source of carbon material, a plurality of seed grains on which diamond material can crystallise, and solvent-catalyst material for promoting the crystallisation of the diamond grains. The synthesis assembly is subjected to a condition for growing the diamond grains. An ultra high pressure and temperature furnace (UHTP) may be used to provide these conditions. Figure 1 gives an example assembly 100, where it comprises a solid cylindrical synthesis assembly 110 and a pair of solid cylindrical buffer bodies 120 separated by a barrier disc 130. The barrier discs 130 comprise a kaolin based material and the assembly itself comprises a mixture of graphite, iron and nickel. The buffer bodies 120 may comprise compacted graphite powder