Process for producing a glass-metal connection

Details Process for producing a glass-metal connection Process for producing a glass-metal connection

1990-02-22

1991-04-02

Lindsay, Robert L.

Glass manufacturing

Processes

Operating under inert or reducing conditions

65 591, 65 5923, 148278, C03C 2702

Patent

active

050044893

ABSTRACT:
The invention concerns glass-metal sealing comprising effecting on a metallic piece, in particular an alloy based on iron and nickel or iron, nickel and cobalt, first of all a decarburization under an atmosphere, at a temperature of between 950.degree. C. and 1,150.degree. C., formed by hydrogen (10 to 99%), water vapor (1 to 8%), with a ratio hydrogen/water vapor higher than five, the possible remainder being nitrogen, then an oxidation under an atmosphere formed by an inert vector gas such as nitrogen, either at a temperature of 600.degree. C. to 800.degree. C. and with a water vapor content of 8% to 2%; or at a temperature of 900.degree. C. to 1,100.degree. C. and with a water vapor content of 4% to 0.5%; then establishing the connection. The gas mixture for a treatment atmosphere is obtained by mixing nitrogen and hydrogen conducted through pipes (13, 14), to which oxygen is added through a pipe (15) upstream of a catalytic chamber (11) permitting the elimination of the oxygen and the production of a content of water vapor.

REFERENCES:
patent: 2043307 (1936-06-01), Scott
patent: 2717475 (1955-09-01), McCarthy
patent: 4445920 (1984-05-01), Smith
patent: 4888037 (1989-12-01), Bandyopadhyay et al.

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