초록 ▼

Glass or ceramic-to-metal composites or seals wherein the glass or ceramic is bonded to an iron base alloy consisting essentially of from 1-5% silicon and from 1-10% chromium, remainder iron. The alloy develops a thermal oxide film which consists essentially of chromium oxide and a2O3 which may comp

Glass or ceramic-to-metal composites or seals wherein the glass or ceramic is bonded to an iron base alloy consisting essentially of from 1-5% silicon and from 1-10% chromium, remainder iron. The alloy develops a thermal oxide film which consists essentially of chromium oxide and a2O3 which may comprise from 10 to 100% of the oxide film thickness on the metal. The invention also includes a process of bonding the glass or ceramic to the metal which eliminates the need of a prolonged heat treatment performed in a special atmosphere.

대표청구항 ▼

A process for forming a glass or ceramic-to-metal composite or seal which comprises: preparing an iron base alloy component by providing a mixture comprising from 1-10% chromium, balance iron, and adding to said mixture from 1-5% silicon as based on the total resulting mixture thereof; oxidizing sai

A process for forming a glass or ceramic-to-metal composite or seal which comprises: preparing an iron base alloy component by providing a mixture comprising from 1-10% chromium, balance iron, and adding to said mixture from 1-5% silicon as based on the total resulting mixture thereof; oxidizing said iron base alloy component by heating in air at a temperature of up to 800°C. for a maximum of three minutes to form on the surface of said component a thin, adherent oxide film consisting essentially of chromium oxide and a2O3; and placing a quantity of glass or ceramic metal on the surface of said oxidized iron base alloy component and heating the so-coated component at the sealing temperature of said glass or ceramic for a time sufficient to fuse said glass or ceramic to said iron base alloy component, wherein said composite may be characterized by a high degree of mismatch of coefficient of thermal expansion between said glass or ceramic and said iron base alloy component.