Composite material protected against oxidation by a self-healing matrix, and a method of manufacturing it

US5965266A · kind A · utility

Assignee

• Societe Nationale d'Etude et de Construction de Moteurs d'Aviation - S.N.E.C.M.A · FR

Inventors

• Stephane Goujard · Moissy-Cramayel, FR
• Jean-Luc Charvet · Saint-Médard-en-Jalles, FR
• Jean-Luc Leluan · Bordeaux, FR
• François Abbe · Martignas-sur-Jalle, FR
• Ghislaine Lamazouade · Parempuyre, FR

Key dates

• Filing date: Sep 26, 1997
• Grant date: Oct 12, 1999
• Expiry date: Sep 26, 2017

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A composite material protected by oxidation at intermediate temperatures exceeding 850.degree. C. comprises fiber reinforcement densified by a matrix which includes at least one self-healing phase including a glass-precursor component such as B.sub.4 C or an Si--B--C system, together with excess free carbon (C) at a mass percentage lying in the range 10% to 35%. The, or each, self-healing phase can be interposed between two ceramic matrix phases, e.g. of SiC. While the material is exposed to an oxidizing medium, oxidation of the free carbon promotes oxidation of the precursor and transformation thereof into a glass capable of plugging the cracks in the matrix by self-healing.