Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1976-05-19
1978-06-27
Padgett, Benjamin R.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75200, 75226, 75243, B22F 104
Patent
active
040972747
ABSTRACT:
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.
REFERENCES:
patent: 2216908 (1940-10-01), DeBats
patent: 3241956 (1966-03-01), Inove
patent: 3819814 (1974-06-01), Pope
Bakul Valentin Nikolaevich
Bilyk Igor Ivanovich
Bronshtein Dolores Khaimovna
Tsypin Nekhemian Veniaminovich
Vovchanovsky Ivan Fedorovich
Barr Josephine L.
Padgett Benjamin R.
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