Metal working – Means to assemble or disassemble – Puller or pusher means – contained force multiplying operator
Patent
1975-07-09
1976-12-28
Hunt, Brooks H.
Metal working
Means to assemble or disassemble
Puller or pusher means, contained force multiplying operator
75203, 75208R, 148126, C22C 2900
Patent
active
039999530
ABSTRACT:
A molded article is provided which is comprised of (1) a core of hard metal body of at least one binder metal of iron, cobalt and nickel and at least one carbide of the elements titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten, and (2) a surface layer of a hard metal on the core. The same carbides that are in the core are in the surface layer. The carbide concentration in the surface layer is greater than in the core and the carbides of the surface layer originate from the core.
A method is provided for producing such articles and comprises subjecting the core of hard metal body to a carbon monoxide-containing gas for a period of from 0.5 to 24 hours, at a temperature of from 1,000.degree. C to 1,600.degree. C and a pressure from 1 Torr to 1,000 Torr to form the surface layer of hard metal on the core.
REFERENCES:
patent: 2765227 (1956-10-01), Goetzel et al.
patent: 3147542 (1964-09-01), Boeckeler
patent: 3171192 (1965-03-01), Ortner et al.
patent: 3647576 (1972-03-01), Yamamura et al.
patent: 3736107 (1973-05-01), Hale
Kolaska Johannes
Rottger Heinz
Fried. Krupp Gesellschaft mit beschrankter Haftung
Hunt Brooks H.
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