Metal treatment – Compositions – Heat treating
Patent
1980-01-22
1981-06-30
Rutledge, L. Dewayne
Metal treatment
Compositions
Heat treating
75200, 75203, 75205, 75224, 75226, 75238, 148 315, C21D 148
Patent
active
042760968
ABSTRACT:
Method for producing a hard metal body having increased wear resistance, the body containing at least one of the binder metals iron, cobalt and nickel and at least one carbide of the elements titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten, the body being produced by way of sintering and having a nitrogen containing surface, comprises subjecting a hard metal body containing the binder metal and carbide to a pressure between 2 bar and 5000 bar in a sintering autoclave at a high temperature and in a nitrogen containing atmosphere, after final sintering, to enrich the hard metal body with nitrogen and to form the nitrogen containing surface.
REFERENCES:
patent: 2596981 (1952-05-01), Chenault et al.
patent: 3368882 (1968-02-01), Ellis et al.
patent: 3854991 (1974-12-01), Hale
patent: 3999954 (1976-12-01), Kolaska et al.
patent: 4019873 (1977-04-01), Reiter
Metals Handbook 8th ed. vol. a, Heat Treating, Cleaning and Finishing, American Society for Metals 1964, pp. 161-162.
Rudiger et al., "Verschleiss-Schutzschichten auf Hartmetablen" pp. 267-282, May 1977, Wear.
VDI-Z 99, No. 36, Dec. 21st (1957).
Grewe Hans
Kolaska Johannes
Fried. Krupp Gesellschaft mit beschrankter Haftung
Rutledge L. Dewayne
Sheehan John P.
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