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Design of high performance CMC brake discs

Journal Article:

Abstract

Ceramic matrix composite (CMC) materials based on 2D-carbon fibre preforms show high heat-absorption capacities and good tribological as well as thermomechanical properties. To take advantage of the full lightweight potential of these new materials in high performance automotive brake discs, the thermal conductivity transverse to the friction surface has to be high in order to reduce the surface temperature. Experimental tests showed, that lower surface temperatures prevent overheating of the brake`s periphery and stabilizes the friction behaviour. In this study different design approaches with improved transverse heat conductivity have been investigated by finite element analysis. C/C-SiC bolts as well as SiC coatings and combinations of them have been investigated and compared with an orthotropic brake disc, showing a reduction of temperature of up to 50%. Original sized brake discs with C/C-SiC have been manufactured and tested under real conditions which verified the calculations. Using only low-cost CMC materials and avoiding any additional processing steps, the potential of C/C-SiC brake discs are very attractive under tribological as well as under economical aspects. (orig.) 4 refs.
Authors:
Krenkel, W; Henke, T [1] 
  1. Deutsche Forschungsanstalt fuer Luft- und Raumfahrt e.V. (DLR), Stuttgart (Germany)
Publication Date:
Mar 01, 1999
Product Type:
Journal Article
Report Number:
CONF-9809110-
Reference Number:
SCA: 360606; PA: CHF-99:0G3411; EDB-99:037043; SN: 99002070969
Resource Relation:
Journal Name: Key Engineering Materials; Journal Volume: 164-165; Conference: 3. international conference on high temperature ceramic matrix composites, Osaka (Japan), 6-9 Sep 1998; Other Information: PBD: 1999
Subject:
36 MATERIALS SCIENCE; SILICON COMPOUNDS; CERAMICS; BRAKES; THERMAL CONDUCTIVITY; TRIBOLOGY; TEMPERATURE DISTRIBUTION; FINITE ELEMENT METHOD; CARBON FIBERS; REINFORCED MATERIALS; COMPOSITE MATERIALS
OSTI ID:
325049
Country of Origin:
Switzerland
Language:
English
Other Identifying Numbers:
Journal ID: KEMAEY; ISSN 1013-9862; TRN: CH99G3411
Submitting Site:
CHF
Size:
pp. 421-424
Announcement Date:

Journal Article:

Citation Formats

Krenkel, W, and Henke, T. Design of high performance CMC brake discs. Switzerland: N. p., 1999. Web.
Krenkel, W, & Henke, T. Design of high performance CMC brake discs. Switzerland.
Krenkel, W, and Henke, T. 1999. "Design of high performance CMC brake discs." Switzerland.
@misc{etde_325049,
title = {Design of high performance CMC brake discs}
author = {Krenkel, W, and Henke, T}
abstractNote = {Ceramic matrix composite (CMC) materials based on 2D-carbon fibre preforms show high heat-absorption capacities and good tribological as well as thermomechanical properties. To take advantage of the full lightweight potential of these new materials in high performance automotive brake discs, the thermal conductivity transverse to the friction surface has to be high in order to reduce the surface temperature. Experimental tests showed, that lower surface temperatures prevent overheating of the brake`s periphery and stabilizes the friction behaviour. In this study different design approaches with improved transverse heat conductivity have been investigated by finite element analysis. C/C-SiC bolts as well as SiC coatings and combinations of them have been investigated and compared with an orthotropic brake disc, showing a reduction of temperature of up to 50%. Original sized brake discs with C/C-SiC have been manufactured and tested under real conditions which verified the calculations. Using only low-cost CMC materials and avoiding any additional processing steps, the potential of C/C-SiC brake discs are very attractive under tribological as well as under economical aspects. (orig.) 4 refs.}
journal = {Key Engineering Materials}
volume = {164-165}
journal type = {AC}
place = {Switzerland}
year = {1999}
month = {Mar}
}