Vapor phase uphill quenching of metal alloys using fluorochemica

Details Vapor phase uphill quenching of metal alloys using fluorochemica Vapor phase uphill quenching of metal alloys using fluorochemica

1989-10-25

1990-11-06

Dean, R.

Metal treatment

Compositions

Heat treating

148125, C22F 102

Patent

active

049683586

ABSTRACT:
Uphill quenching of metal alloys, such as aluminum alloys, is improved by conducting the heating step, after the quench-cooling step of the uphill quenching, using the elevated temperature vapor of a fluorochemical compound, preferably a perfluorocarbon compound. The vapor formed over a boiling bath of the perfluorocarbon compound comprises the heat source when it condenses on the relatively cooler alloy thus imparting its heat of condensation to the alloy.

REFERENCES:
patent: 2459780 (1949-01-01), McBee
patent: 2549686 (1985-10-01), Sargent et al.
patent: 2949392 (1960-08-01), Willey
"Uphill Quenching of Aluminum: Rebirth of a Little-Known Process"; by Tom Croucher in Heat Treating; Oct. 1983; pp. 30-32.
"The Thermal Mechanical Method for Relieving Residual Quench Stresses in Aluminum Alloys"; by H. M. Hill, R. S. Barker, L. A. Wiley in Transactions of the American Society for Metals; vol. 52; 1959.
"Development of Stress Relief Treatments for High Strength Aluminum Alloys"; from a NASA Quarterly Progress Report; Contract No. NAS8-11091; 1964; Manlabs, Inc.
"Polycyclic Fluoroaromatic Compounds III"; by D. Harrison, M. Stacey, R. Stephens, J. C. Tatlow in Tetrahedron; 1963; vol. 19; pp. 1893 & 1899.

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