Temperature Effects on the Friction and Wear Behaviors of SiCp/A356 Composite against Semimetallic Materials

Like Pan,Zhiyong Yang,Zhiqiang Li,Jialin Wang,Jianmin Han,Xiang Li,Weijing Li

doi:10.1155/2017/1824080

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https://doi.org/10.1155/2017/1824080

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Abstract

Due to the low density and high temperature resistance, the SiCp/A356 composites have great potential for weight reduction and braking performance using the brake disc used in trains and automobiles. But the friction coefficient and braking performance are not stable in the braking process because of temperature rising. In this paper, friction and wear behaviors of SiCp/A356 composite against semimetallic materials were investigated in a ring-on-disc configuration in the temperature range of 30°C to 300°C. Experiments were conducted at a constant sliding speed of 1.4 m/s and an applied load of 200 N. Worn surface, subsurface, and wear debris were also examined by using SEM and EDS techniques. The third body films (TBFs) lubricated wear transferred to the third body abrasive wear above 200°C, which was a transition temperature. The friction coefficient decreased and weight of semimetallic materials increased with the increase of temperature and the temperature had almost no effect on the weight loss of composites. The dominant wear mechanism of the composites was microploughing and slight adhesion below 200°C, while being controlled by cutting grooves, severe adhesion, and delamination above the 200°C.

Highlights

Particle reinforced aluminum alloy composites (PRACs) exhibit high specific strength and stiffness, high thermal conductivity, and good thermal resistance and have been used in a variety of structural applications ranging from civil transportation to aerospace [1, 2]
Natarajan et al investigated the friction behavior of 25 wt.% SiCp/A356 composites against semimetallic material under different load and sliding velocity, and PRACs were found more suitable to be used as a candidate material for brake rotor application than cast iron [5]
The friction and wear behaviors of SiCp/A356 composites, which can be used for brake disc material for the train and automobile, were studied to analyze temperature effects on the wear mechanism, friction coefficient, and wear rates

Summary

Introduction

Particle reinforced aluminum alloy composites (PRACs) exhibit high specific strength and stiffness, high thermal conductivity, and good thermal resistance and have been used in a variety of structural applications ranging from civil transportation to aerospace [1, 2]. Some researchers have studied the friction properties under different load and sliding speed for the PRACs which were used in automobile. Natarajan et al investigated the friction behavior of 25 wt.% SiCp/A356 composites against semimetallic material under different load and sliding velocity, and PRACs were found more suitable to be used as a candidate material for brake rotor application than cast iron [5]. Uyyuru et al used the Al-Si-SiCp composite to study the wear rate and friction coefficient varied with the applied normal load and the sliding speed against the brake pad material. The changes of friction coefficient and wear rate at different load and speed range of the 20 vol.% SiCp/A359 composites and cast iron were studied by Daoud and Abou El-khair, against a commercial automotive brake material on a pin-on-disc type apparatus. The result shows that the friction coefficient of the composite was higher than cast iron at all test conditions [8]

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