Heritage Silversmiths Limited

Her Majesty the Queen in Right of Canada, As Represented by the Minister

Quality Hermetics Limited

Peter Mayer

Mohammed Zamin

Robert W Blair

John A Topping

M Krishna Murthy

Albert H Brooks

Corrosion-resistant, hermetic glassceramic-to-metal seals are made in a single rapid heating step by inserting a glass preform made of 25-35% by weight ZnO, 2.5-10% by weight Al.sub.2 O.sub.3 and 30-60% SiO.sub.2 together with optional nucleating and/or fluxing agents, between a metal pin and surrounding metal collar. Heating is rapid in a single step to first fluidize the glass, while avoiding excessive oxidation of the metal pin and the metal collar and to prevent excessive interaction of the glass composition at the glass/collar interface, then to ceram the seal. The resulting seals exhibit good corrosion resistance to potassium hydroxide solutions and are useful in Ni-Cd batteries.

Method of forming corrosion-resistant glassceramic-to-metal seals

The electrofinishing of stainless steel items, especially cutlery items, to a substantially corrosion resistant mirror finish is achieved in two steps, the first step involving electropolishing and the second step passivation of the electropolished surface. Apparatus for effecting the electrofinishing operation is also described.

Electrochemical finishing of stainless steel

Electropolishing of stainless steel

Apparatus for electrochemical finishing of stainless steel

Hermetic glass seals of high electrical resistivity are provided. Glass compositions suitable for use in such seals and based on lead-silica glasses are described. Glass compositions having particular efficacy in a nuclear reactor environment also are described.

Glass seal

Growing community of inventors

Burlington, Canada

Peter Mayer