Method for siliconizing carbon-containing materials

US7763224B2 · kind B2 · utility

Assignee

• AUDI AG · DE

Inventors

• Andreas Kienzle · Thierhaupten, DE
• Johann Daimer · Bad Aibling, DE
• Rudi Beck · Lotus Pond, DE
• Otto Mederle · Meitingen, DE
• Matthieu Schwartz · Augsburg, DE
• Jens Rosenlocher · Augsburg, DE

Key dates

• Filing date: Mar 1, 2007
• Grant date: Jul 27, 2010
• Expiry date: Jul 15, 2028

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P40/60
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

A method for treating workpieces that consist of porous carbon material with liquid silicon with the formation of silicon carbide, comprising the steps: Preheating porous carbon workpieces under inert gas to the selected operating temperature TB1, feeding liquid silicon to the porous carbon workpieces at an operating pressure pB2 and an operating temperature TB2, and impregnating the porous carbon workpieces with liquid silicon, reaction of the liquid silicon in the workpiece at a temperature TB3 with the formation of silicon carbide that consists of carbon and silicon, gassing the workpiece with inert gas and cooling from the operating temperature TB3 to the conditioning temperature Tk, cooling the workpieces to room temperature, the temperature TB3 being greater than or equal to the temperature TB2, and the workpiece in step d of the method no longer being in contact with liquid silicon outside of the workpiece.