Process for protecting fiber-reinforced carbon-containing composites against oxidation

US7011888B2 · kind B2 · utility

Assignee

• SGL Carbon AG · DE

Inventors

• Moritz Bauer · Augsburg, DE
• Martin Christ · Osterode, DE
• Udo Gruber · Neusäß, DE
• Andreas Kienzle · Thierhaupten, DE
• Jens Rosenlocher · Augsburg, DE
• Rainer Zimmerman-Chopin · Meitingen, DE

Key dates

• Filing date: Dec 6, 2002
• Grant date: Mar 14, 2006
• Expiry date: Nov 26, 2023

Classification

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

Abstract

Process for protecting fiber-reinforced, carbon-containing composites whose matrix comprises, at least in the outer layer, silicon carbide (SiC) and also silicon (Si) and/or silicon alloys against oxidation, which comprises the steps a) impregnation of the composite with an aqueous, phosphate-containing solution, b) drying, c) heat treatment at a temperature which is at least sufficient to convert the dried solution into insoluble compounds which are suitable for forming a self-healing glass, wherein the composite is treated oxidatively to form silicon oxide (SiO2) either prior to step a), between steps a) and b) or during or after step b) and/or c).