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US 8,757,471 B2Granted
Active braze techniques on beta-alumina
AssigneeGeneral Electric Company
InventorsSundeep Kumar, Mohandas Nayak, Mohamed Rahmane
Life of this patent
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Abstract
The present disclosure generally relates to methods of using active braze techniques on beta-alumina. In some specific embodiments, the present disclosure relates to a method of sealing a portion of beta-alumina electrolyte, insulated collar and metal rings of a sodium-based thermal battery.
Claims19
A method of sealing a portion of beta-alumina electrolyte, insulated collar and metal rings of a sodium-based thermal battery, comprising:
- a) introducing a braze alloy composition between a first component and a second component to be joined, wherein the first component is comprised of beta-alumina and the second component is comprised of a ceramic insulator;
- b) introducing the braze alloy composition between the second component and a third component to be joined, wherein the third component is comprised of metal or metal alloy;
- and
- c) heating the components to form an active braze seal (joint) between the first component and the second component and between the second component and the third component.
1 more element
A method of joining a ceramic insulator and beta-alumina by active brazing, comprising:
- a) introducing a braze alloy composition between the ceramic insulator and the beta-alumina to be joined;
- and
- b) heating the components to form an active braze seal (joint) between the ceramic insulator and the beta-alumina;
- wherein said braze alloy composition comprises nickel and an active metal element, and further comprises a) germanium, b) niobium and chromium, or c) silicon and boron;
- or wherein said braze alloy composition comprises copper, nickel and an active metal element;
- and wherein
- the heating step is carried out at a brazing temperature that is equal to or greater than the liquidus temperature of the braze alloy composition;
- and less than the melting temperatures of the components to be joined;
- comprising the step of holding the brazing temperature constant in a range of about 1050 to about 1100 degrees Celsius for about 15 minutes, then holding the brazing temperature constant at a temperature in a range of about 1150 to about 1250 degrees Celsius for about 15 minutes.
6 more elements
Dependencies are inferred from the claim text.