Metal treatment – Compositions – Heat treating
Patent
1983-12-09
1985-08-20
Rutledge, L. Dewayne
Metal treatment
Compositions
Heat treating
148 203, C22F 102
Patent
active
045362270
ABSTRACT:
It is necessary in many heat treatment processes conducted in open systems to maintain a given partial pressure of a volatile component of a material being treated, and it is desirable to conserve this volatile component, both on account of cost and in the case of components such as mercury, toxicity. A controlled unsaturated vapor pressure of a volatile liquid 28 may be produced in a tube 3 by passing a stream of a carrier gas through a vaporizer 4 containing the liquid 28 at a temperature T.sub.s, passing the mixture of the carrier gas and vapor of the liquid 28 through a tube 3 containing material 29 to be treated, which material 29 is at a temperature T.sub.t. The mixture of the carrier gas and vapor of the liquid 28 is then passed to a condenser 6 from which the carrier gas is vented to waste, and the vapor of the liquid 28 is condensed at a temperature T.sub.c in the condenser 6. T.sub.t >T.sub.s >T.sub.c. The condensate passes from the condenser 6 to the vaporizer 4 through a tube 12, and the liquid 28 fills a cross-section of a length of the tube 12.
REFERENCES:
patent: 3836408 (1974-09-01), Kosano
patent: 3979232 (1976-09-01), Hager et al.
patent: 4374684 (1984-02-01), Micklethwaite
Brice John C.
Brough Colin R.
Kastler S.
Rutledge L. Dewayne
Spain Norman N.
U.S. Philips Corporation
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