Friction body or sliding body formed from composite materials reinforced with fiber bundles and containing a ceramics matrix and process for the production of a friction or sliding body

US6703117B2 · kind B2 · utility

Assignee

• SGL Carbon AG · DE

Inventors

• Udo Gruber · Neusäß, DE
• Michael Heine · Meitingen, DE
• Andreas Kienzle · Thierhaupten, DE

Key dates

• Filing date: May 28, 2002
• Grant date: Mar 9, 2004
• Expiry date: May 28, 2022

Classification

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

Abstract

A friction or sliding body includes at least two composite materials reinforced with fiber bundles and containing a ceramics matrix. A first composite material forms the outside of the sliding body as a friction layer and a second composite material forms a supporting body joined areally to the friction layer. The fiber bundle lengths of the friction layer are significantly shorter than the fiber bundle lengths of the supporting body. The fiber bundles of the friction layer have a clear alignment perpendicular to the surface. The surface of the friction layer is formed substantially only of small regions of free carbon with a diameter of at most 1.2 mm, and a total fraction of the area of free carbon on the surface is at most 35%. The surface has an extremely fine crack structure and the friction layer exhibits virtually no stresses in the vicinity of the surface. A process for producing a friction or sliding body and a brake disc or brake lining are also provided.