16:00 〜 16:20
[15F-T13-06] Enhancing the Thermal Conductivity in Copper Alloy Brake Pads through SiC and Its Dissociation
キーワード:Sintered Brake Pads, SiC Dissociation, Design of Experiments
In this study, we developed copper matrix brake pads with a high thermal conductivity for high-performance applications (braking temperatures above 600°C). The brake pad consists of a copper alloy matrix with coarse SiC (>50 µm) as the friction component, and graphite as a solid lubricating agent. To reduce wear, without using Sn and Zn, which reduce thermal conductivity and the melting point of the alloy, the matrix was hardened (>100 HV) by solubilized Si from the dissociation of fine SiC (<20 µm) upon sintering. To optimize the formulation, the design of experiments (DOE) was conducted by varying the volume contents of graphite (5%, 12.5%, and 20%) and coarse SiC (0%, 5%, and 10%). In the tribometer, the materials displayed a stable friction coefficient (COF) with a higher COF (0.20) than commercial pads (0.15), similar compositions, and similar wear rates, indicating the promising characteristics of brake pads for high-speed trains.