Preparation and Dynamometer Tests of 3D Needle‐Punched C/C‐SiC Composites for High‐Speed and Heavy‐Duty Brake Systems

Abstract

Three-dimensional (3D) needle-punched C/C-SiC brake composites were fabricated by chemical vapor infiltration combined with liquid silicon infiltration. The microstructures, properties, and dynamometer tests for different high-speed and heavyduty brake systems had been investigated. The results indicated that the value of flexural strength and compressive strength can reach 182 Mpa and 234 MPa, respectively. Their thermal conductivity remained between 15-21 W/m/K between room temperature and 1100°C. The dynamometer test of 3D needle-punched C/C-SiC brake disk and pads for high-speed trains, according to the procedure of International Union of Railways, showed that the coefficient of friction (l) was about 0.32 and not sensitive to the brake speeds. After four times of emergency stops, the linear wear rate of the C/C-SiC pads was 0.481 cm 3 /MJ. The C/ C-SiC brake pairs of vehicle were tested with inertia dynamometer according to SAE's J2522 testing procedure, and the characteristic values of the C/C-SiC brakes indicated that the hot fade was almost 0. The C/C-SiC pads were matched with C45 steel disk and tested for engineering machineries brake system, and the wear rate of C/C-SiC pads was 4.2 lm/cycle and less than one-sixth of that of the traditional powder metallurgy brake pad. The 3D needle-punched C/C-SiC brake composites have been demonstrated to be the top choice for advanced friction materials of high-speed and heavy-duty brake systems.

Influence of the fiber orientation on 3D C/C–SiC composite material and its formation mechanism of the machining surface

“…to satisfy the needs of integrated thermal structure design [1][2][3]. Therefore, C/C-SiC composites are widely used in the key parts of aerospace flight vehicles [4][5][6].…”

Investigation on Speed-Load Sensitivity to Tribological Properties of Copper Metal Matrix Composites for Braking Application

“…The matrix of Cu-MMC was formed by sintered copper with the addition of iron, and abrasive particles (ZrO 2 , FeCr) and solid lubricants (graphite, MoS 2 ) were introduced to provide the desired level of coefficient of friction and improve the wear resistance. The density of Cu-MMC measured by the Archmedes's method at room temperature was 4.80 g/cm 3 . braking speed, normal load, and frequency of braking.…”

“…Brake friction materials play a major role in slowing down moving objects, or bringing them to a complete stop. Difficulties may arise with them in increasingly harsh environments, e.g., higher braking speed, heavier unit load, and extreme high vacuum [1][2][3]. Various friction materials have been developed as candidates for such braking applications.…”

Fiber orientation dependence of tribological behavior of short carbon fiber reinforced ceramic matrix composites

“…Based on these results, the possible wear and friction mechanisms of the brake pads with different short A survey of the published literature shows that process modeling of CMCs has been studied by a number of researchers. Processes that have been modeled include RMI, 15,16 CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltration. 23 Impregnation of alumina matrix in eight-harness satin Nextel 610 fabric has been studied numerically in Ref.…”

“…Carbon fiber (C‐fiber) reinforced carbon−silicon carbide (C/C‐SiC) composites with advantages such as low density, high‐temperature resistance, fatigue resistance, high specific strength, and wear resistance show high application potential used as high‐performance friction materials 1–5 . Since Krenkel et al started investigations on liquid silicon infiltration (LSI) based C/C‐SiC composites for applications in high performance automobiles in the early 1990s, 6,7 C/C‐SiC composites as components in braking systems have been well developed for aircrafts, engineering machinery, special vehicles, elevators, and high speed trains 8–16 . However, previous investigations concerning braking properties indicated that C/C‐SiC composites show high wear rate and unstable friction coefficient during braking 10,17 …”