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Igor Ivanovich Bilyk

Valentin N Bakul

Ivan Fedorovich Vovchanovsky

Nekhemian Veniaminovich Tsypin

Dolores Khaimovna Bronshtein

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.degree. C at a rate of 1,000.degree.-1,100.degree. 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.degree. C at a rate of 3,000.degree.-10,000.degree. 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.

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Kyiv, Ukraine

Igor Ivanovich Bilyk