Self-lubricating composite containing chromium oxide

US5866518A · kind A · utility

Assignee

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

Inventors

• Christopher DellaCorte · Medina, US
• Brian J. Edmonds · Cleveland, US

Key dates

• Filing date: Jan 16, 1997
• Grant date: Feb 2, 1999
• Expiry date: Jan 16, 2017

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10M2201/18
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A self lubricating, friction and wear reducing composite material useful over a wide temperature range of from cryogenic temperature up to about 900.degree. C. contains 60-80 wt. % of particulate Cr.sub.2 O.sub.3, dispersed in a metal binder of a metal alloy containing Cr and at least 50 wt. % of Ni, Cr or a mixture of Ni and Cr. It also contains 5-20 wt. % of a fluoride of at least one Group I, Group II, or rare earth metal and, optionally, 5-20 wt. % of a low temperature lubricant metal. Such as Ag, Au, Pt, Pd, Rh and Cu. This composite exhibits less oxidation instability and less abrasiveness than composites containing chromium carbide, is readily applied using plasma spray and can be ground and polished with a silicon carbide abrasive.