Bonding of sapphire to sapphire by eutectic mixture of aluminum oxide and zirconium oxide

US4155475A · kind A · utility

Assignee

• The United States of America as represented by the Administrator of the National Aeronautics and Space Administration · US

Inventor

• John DeLuca · Longmeadow, US

Key dates

• Filing date: Dec 30, 1975
• Grant date: May 22, 1979
• Expiry date: Dec 30, 1995

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01S3/1636
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Bonding of an element comprising sapphire, ruby or blue sapphire to another element of such material with a eutectic mixture of aluminum oxide and zirconium oxide. The bonding mixture may be applied in the form of a distilled water slurry or by electron beam vapor deposition. In one embodiment the eutectic is formed in situ by applying a layer of zirconium oxide and then heating the assembly to a temperature above the eutectic temperature and below the melting point of the material from which the elements are formed. The formation of a sapphire rubidium maser cell utilizing eutectic bonding is shown.