Gelled solder glass suspensions for sealing glass or ceramic parts
AssigneeCorning Glass Works
InventorsDaniel W. Corbett, Donald L. Guile
Life of this patent
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Abstract
A solder glass suspension for sealing glass or other ceramic parts is provided having the characteristics of a reversible gel, exhibiting high viscosity during storage and after extrusion onto a sealing surface, but relatively low viscosity under shear stress during extrusion. The use of the suspension for sealing glass or ceramic parts is also described.
Claims22
A solder glass suspension having the characteristics of a reversible gel, suitable for the application of fritted solder glass to the surface of a glass or ceramic part to be sealed, which comprises:
- an organic vehicle consisting essentially of a cellulose binder and an organic solvent for the binder;
- a fritted solder glass;
- and
- a gelling agent in a proportion at least sufficient to render the solder glass suspension essentially non-settling and non-sagging under the influence of gravity, while permitting said suspension after it is sheared by remixing or dispensing to become relatively flowable and readily extrudable onto a sealing surface, yet while permitting said suspension after extrusion to rapidly regel to retain its extruded shape and to be essentially non-flowable, non-settling and non-sagging under the influence of gravity, the gelling agent being one which does not adversely affect the sealing process or the mechanical integrity of the final seal.
A method for extending the useful life of a solder glass suspension, the solder glass suspension comprising a fritted solder glass in an organic vehicle and the organic vehicle consisting essentially of a cellulose binder and an organic solvent for the binder, which comprises the step of:
- adding a gelling agent to the suspension to impart a reversibly gelled structure thereto, the gelling agent being added in a proportion at least sufficient to render the suspension essentially non-settling and non-sagging under the influence of gravity, while permitting said suspension after it is sheared by remixing or dispensing to become relatively flowable and readily extrudable onto a sealing surface, yet while permitting said suspension after extrusion to rapidly regel to retain its extruded shape and to be essentially non-flowable, non-settling and non-sagging under the influence of gravity, the gelling agent being one which does not adversely affect the sealing process or the mechanical integrity of the final seal.
Dependencies are inferred from the claim text.