Process for producing a glass-metal connection
First Claim
1. A method of bonding together a glass part and a metal alloy part, said metal alloy part comprising iron and nickel, comprising the following successive steps:
- subjecting said glass part and said metal alloy part to an oxidation phase under a first atmosphere which is substantially inert and contains from 2 to 8% of water vapor and less than 1% of hydrogen at a first temperature of from 600°
to 800°
C.;
bonding said glass part and said metal alloy part together under a second atmosphere at a second temperature greater than the first temperature,wherein at least said first atmosphere is obtained by a catalytic reaction of a mixture of hydrogen and oxygen in proportions selected so as to obtain the desired content of water vapor and hydrogen.
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Accused Products
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° C. and 1,150° 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° C. to 800° C. and with a water vapor content of 8% to 2%; or at a temperature of 900° C. to 1,100° 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.
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Citations
11 Claims
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1. A method of bonding together a glass part and a metal alloy part, said metal alloy part comprising iron and nickel, comprising the following successive steps:
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subjecting said glass part and said metal alloy part to an oxidation phase under a first atmosphere which is substantially inert and contains from 2 to 8% of water vapor and less than 1% of hydrogen at a first temperature of from 600°
to 800°
C.;bonding said glass part and said metal alloy part together under a second atmosphere at a second temperature greater than the first temperature, wherein at least said first atmosphere is obtained by a catalytic reaction of a mixture of hydrogen and oxygen in proportions selected so as to obtain the desired content of water vapor and hydrogen. - View Dependent Claims (2, 3, 6, 7)
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8. A method for bonding together a glass part and a metal alloy part, said metal alloy part comprising iron and nickel, which comprises the following successive steps:
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subjecting said glass part and said metal alloy part to an oxidation phase under a first atmosphere is substantially inert and contains from 0.5 to 4% of water vapor and less than 1% hydrogen, at a first temperature of from 900°
to 1100°
C.;bonding said glass part to said metal alloy part under a second atmosphere at a second temperature which is greater than said first temperature, wherein at least said first atmosphere is obtained by catalytic reaction of a mixture of hydrogen and oxygen in proportions selected so as to obtain the desired content of water vapor and hydrogen. - View Dependent Claims (4, 5, 9, 10, 11)
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Specification