C - Chemistry – Metallurgy – 03 – C
Patent
C - Chemistry, Metallurgy
03
C
316/49, 49/81
C03C 27/02 (2006.01) C03C 3/085 (2006.01) C03C 8/24 (2006.01) C03C 29/00 (2006.01) H01M 2/08 (2006.01)
Patent
CA 1091025
ABSTRACT OF THE DISCLOSURE There is described a glass composition for use in corrosion-resistant, hermetic glassceramic-to-metal seals, the composition having the property of sequentially fluidizing, sealing and ceraming during a single heating step, comprising about 25.0 - 32.0% by weight ZnO, about 2.5 - 10.0% by weight A12O3 and about 30.0 - 60.0% by weight SiO2 together with optional fluxing and/or nucleating agents. Also described is a method of making a plug seal having a metal pin electrode mounted by a cor- rision-resistant, hermetic glassceramic-to-metal seal in a surround- ing metal collar, comprising the steps of positioning a glass composition preform between and in proximity to the pin and the collar, within a controlled atmosphere enclosure, rapidly heating the metal pin and collar to cause the glass preform to heat, by con- duction and radiation, so that it flows between and adheres to the pin and collar, and then cerams, and cooling the plug seal within the controlled atmosphere enclosure to room temperature. The method, at least when using a glass composition as described above, avoids the necessity of separate heating steps in order to first fluidize and subsequently ceram the glass. Further described is apparatus for use in making a hermetic plug seal having a metal pin electrode mounted by a corrosion-resistant glassceramic-to- metal seal in a surrounding metal collar, comprising a R.F. induc- tion coil mounted about an oven body having gas inlet means and a loading port, a jig positionable within said oven body, for holding a glass composition preform between and in proximity to the pin and the collar, a gas-permeable closure for sealing said loading port, a generator and source of power for said R.F. induc- tion coil, and a source of inert gas in communication with said gas inlet means. The plug seals exhibit good corrosion resistance, particularly in a corrosive environment such as a 30% KOH electro- lyte utilized in Ni-Cd batteries.
292073
Mayer Peter
Topping John A.
Her Majesty The Queen In Right Of Canada As Represented By The M
Macrae & Co.
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