Super hard constructions & methods of making same

A super hard polycrystalline construction, suitable for abrasive applications comprising a body of polycrystalline super hard material (PCD). This material comprises a first fraction of super hard grains and a second fraction of super hard grains, where the first fraction has a greater average grain...

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Bibliographische Detailangaben
1. Verfasser:	Mehmet Serdar Ozbayraktar
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS ARTIFICIAL STONE CASTING CEMENTS CERAMICS CHEMISTRY COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS CONCRETE EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING FERROUS OR NON-FERROUS ALLOYS FIXED CONSTRUCTIONS LIME, MAGNESIA MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PERFORMING OPERATIONS POWDER METALLURGY REFRACTORIES SLAG TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS TREATMENT OF NATURAL STONE WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	A super hard polycrystalline construction, suitable for abrasive applications comprising a body of polycrystalline super hard material (PCD). This material comprises a first fraction of super hard grains and a second fraction of super hard grains, where the first fraction has a greater average grain size than the super hard grains in the second fraction. The super hard grains in the first and second fraction have a peripheral surface where the super hard grains in the first fraction are bonded along at least a portion of the peripheral surface to at least a portion of a plurality of super hard grains in the second fraction. The super hard grains in the first fraction are spaced from adjacent grains in the first fraction by a distance of between 50-500nm. This is made by HPHT treatment of an at least bimodal starting powder of preferably diamond having one fraction with a particle size of 50-500 nm.