[T13] Non Ferrous Materials

[15F-T13-06] Enhancing the Thermal Conductivity in Copper Alloy Brake Pads through SiC and Its Dissociation

*M. V. K. Giaretton¹, I. S. Deschamps¹, W. F. de Camargo², C. H. S. Pereira², D. Masotti², A. Casaril², A. N. Klein¹ (1.Federal University of Santa Catarina, Brazil, 2.Frasle Mobility, Brazil)

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.