Alpha alumina protective coatings for bond-coated substrates and their preparation

US5683761A · kind A · utility

Assignee

• General Electric Company · US

Inventors

• Robert William Bruce · Loveland, US
• Mark Rosenzweig · Sharon, US
• Bangalore Aswatha Nagaraj · Sharonville, US
• Jon Conrad Schaeffer · Simpsonville, US
• William B. Connor · Clifton Park, US
• David J. Wortman · Niskayuna, US

Key dates

• Filing date: May 25, 1995
• Grant date: Nov 4, 1997
• Expiry date: May 25, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T50/60
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

A bond-coated substrate is protected with an alpha alumina layer. The alpha alumina layer may be deposited as a relatively thick layer directly onto the bond-coated substrate. In this embodiment, no further ceramic layer overlies the alpha alumina layer. Other ceramics may be mixed into the alpha alumina layer, however. In another embodiment, a layer of a ceramic other than alpha alumina is deposited over the bond-coated substrate, and an alpha alumina layer is deposited over the ceramic layer.