Nanoparticle-modified carbon-ceramic brake discs

US7419700B2 · kind B2 · utility

Assignee

• AUDI AG · DE

Inventors

• Hans-Michael Guther · Nierstein, DE
• Jens Rosenlocher · Augsburg, DE
• Moritz Bauer · Augsburg, DE

Key dates

• Filing date: Aug 30, 2005
• Grant date: Sep 2, 2008
• Expiry date: Mar 28, 2026

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24997
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Carbon-ceramic brake discs, the remaining porosity in which, after infiltration with a carbide-forming element and reaction of this element with at least part of the carbon in the preliminary body of the carbon-ceramic brake disc to form carbides, is at least partly filled with particles whose average diameter is in the range from 0.5 nm to 20 nm, and a process for producing carbon-ceramic brake discs with reduced porosity, wherein carbon-ceramic brake discs are treated with a solution of organic compounds of boron, zirconium, titanium, silicon or aluminum or mixtures of such compounds, the cited organic compounds being present as sols in an organic solvent, after removal from the sol bath the brake discs treated in this way are dried in an oven at a heating rate of between 30 K/h and 300 K/h under air or protective gas and are then tempered at a final temperature of between 350° C. and 800° C. for between 20 minutes and 120 minutes