Comparison of Braking Behaviors between Metallic-Based and Ceramic-Based Pads on C/C-Sic Discs Tested on a Full-Scale Dynamometer

Abstract

Investigating the tribological behavior of C/C-SiC composites against various friction linings is crucial for their advancement. In this study, a full-scale dynamometer was used to study the tribological behavior of C/C-SiC brake discs against metallic-based and ceramic-based brake pads. The semipolar deviation of braking torque (Tsd) was innovatively used to evaluate the fluctuation of braking torque under actual braking conditions of different friction pairs. The results indicated that the friction coefficient of metallic-based pads fluctuates between 0.33 and 0.5, whereas that of ceramic-based pads ranges from 0.28 to 0.47 under different braking conditions. The analysis of the worn surfaces revealed that the metallic-based pads form a continuous friction film, and their wear mechanism is mainly abrasive wear and adhesive wear. In contrast, the ceramic-based pads form a striped friction film, and their wear mechanism is mainly abrasive wear and fatigue exfoliation.

Keywords: C/C-SiC disc, Braking behaviors, full-scale dynamometer, Wear mechanism