Method of making superhard articles

A superhard article is produced by heating in two steps a mixture of a hard-alloy matrix material and diamond grains less than 1 mm in size in a graphite press mould. During the first heating step, the mixture is heated to a temperature of 1,200 DEG C at a rate of 1,000 DEG -1,100 DEG C per minute b...

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Bibliographische Detailangaben
Hauptverfasser:	BAKUL, VALENTIN NIKOLAEVICH, BRONSHTEIN, DOLORES KHAIMOVNA, BILYK, IGOR IVANOVICH, VOVCHANOVSKY, IVAN FEDOROVICH, TSYPIN, NEKHEMIAN VENIAMINOVICH
Format:	Patent
Sprache:	eng
Schlagworte:	ALLOYS CASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY FERROUS OR NON-FERROUS ALLOYS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POWDER METALLURGY THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	A superhard article is produced by heating in two steps a mixture of a hard-alloy matrix material and diamond grains less than 1 mm in size in a graphite press mould. During the first heating step, the mixture is heated to a temperature of 1,200 DEG C at a rate of 1,000 DEG -1,100 DEG C per minute by heating the press mould by high frequency. During the second heating step, the mixture is heated to the sintering temperature, up to 1,800 DEG C at a rate of 3,000 DEG -10,000 DEG C per minute by heating the mixture by the resistance method, i.e. by passing electric current through the mixture while simultaneously heating the press mould by high frequency currents.