Sintered Diamond Compacts with a Cobalt Binder

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Science  11 Jun 1971:
Vol. 172, Issue 3988, pp. 1132-1134
DOI: 10.1126/science.172.3988.1132


Diamond powder can be successfully cemented with cobalt. At 62 kilobars the sintering occurs over the temperature range from 1570° to 1610°C. The maximum microhardness of the compact (〉 3000 kilograms per square millimeter on the Knoop scale) is obtained with a mixture of 20 percent cobalt (by volume) and a diamond particle size of 1 to 5 micrometers.