Preparation and properties of C/C-SiC brake composites fabricated by warm compacted-in situ reaction

Abstract

Carbon fibre reinforced carbon and silicon carbide dual matrix composites (C/C-SiC) were fabricated by the warm compacted-in situ reaction. The microstructure, mechanical properties, tribological properties, and wear mechanism of C/C-SiC composites at different brake speeds were investigated. The results indicate that the composites are composed of 58wt% C, 37wt% SiC, and 5wt% Si. The density and open porosity are 2.0 g·cm⁻³ and 10%, respectively. The C/C-SiC brake composites exhibit good mechanical properties. The flexural strength can reach up to 160 MPa, and the impact strength can reach 2.5 kJ·m⁻². The C/C-SiC brake composites show excellent tribological performances. The friction coefficient is between 0.57 and 0.67 at the brake speeds from 8 to 24 m·s⁻¹. The brake is stable, and the wear rate is less than 2.02×10⁻⁶ cm³·J⁻¹. These results show that the C/C-SiC brake composites are the promising candidates for advanced brake and clutch systems.

Keywords

C/C-SiC / ceramic matrix composites / tribological properties / microstructure

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