Development and Characterization of C/C-SiC Brake Disc

Abstract

A new process was developed to produce full-size carbon/carbon-SiC brake discs consisting of two friction layers and a structural layer. Different lengths of chopped carbon fibers were used for the friction layers and structural layer. A preform of each layer was produced by hot-pressing a mixture of resin and carbon fibers. After pyrolyzing the preforms, the layers were joined by hot-pressing. Finally, liquid Si infiltration was performed to obtain a C/C-SiC brake disc. The tensile strength, compressive strength, and bending strength were 40, 46, and 61 MPa, respectively. The density of the disc was 2.1 g/Cm³. The heat transfer coefficient in the vertical direction was 16.5 W/m-°C, and it was 45.9 in the horizontal direction. The friction coefficients obtained under various braking conditions showed stable and suitable values, 0.2–0.6.

Keywords:

• Brake
• C/C
• Disc
• Dynamometer
• Friction
• Infiltration
• Preform
• Pressing
• Pyrolysis
• SiC
• Wear

ACKNOWLEDGMENTS

The author is grateful to the Korea Railroad Research Institute for the support of this research.