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Research Papers: Friction & Wear

Dry Sliding Wear Studies of Copper-Based Powder Metallurgy Brake Materials

[+] Author and Article Information
Glenn Kwabena Gyimah

Mem. ASME
School of Mechanical
and Automotive Engineering,
South China University of Technology,
Guangzhou 510640, China
e-mail: gk.gyimah@yahoo.com

Ping Huang

School of Mechanical
and Automotive Engineering,
South China University of Technology,
Guangzhou 510640, China
e-mail: mephuang@scut.edu.cn

Dong Chen

School of Mechanical
and Automotive Engineering,
South China University of Technology,
Guangzhou 510640, China
e-mail: cityeast@scut.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received November 20, 2012; final manuscript received April 19, 2014; published online May 19, 2014. Assoc. Editor: Robert Wood.

J. Tribol 136(4), 041601 (May 19, 2014) (6 pages) Paper No: TRIB-12-1206; doi: 10.1115/1.4027477 History: Received November 20, 2012; Revised April 19, 2014

The paper focuses on a novel friction material on Cu-based powder metal material. Several elements, such as Al, SiO2, Fe, graphite, Sn, Mn, and MoS2 were added to the Cu and were developed by PM techniques. The aim of the experiment was to study the effect of increasing Sintering temperature on mechanical and tribological characteristics of the novel train brake pads. The materials prepared were sintered at three different temperatures (850 °C, 900 °C, and 950 °C). A high pressure pad-on-disk braking tester was developed to test the wear behavior of these materials without lubrication. Wear was measured by microscopic examination of the pad after the tribometer test. The tests showed that the coefficient of friction, wear rate and wear number were improved immensely by high temperature sintering. This means that, the level of the sintering temperature has significant effect on the performance of the braking material. Thereby, the tribological and the mechanical properties of the novel material were found to be temperature sensitive.

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References

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Figures

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Fig. 1

(a) Relationship between density and sintering temperature. (b) Relationship between porosity and sintering temperature.

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Fig. 2

Relationship between hardness and sintering temperature

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Fig. 3

(a) Average coefficient of friction versus the sintering temperatures. (b) Coefficient of friction versus disk operating temperatures.

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Fig. 4

(a) The variation of wear number and wear coefficient as a function of sintering temperatures. (b) The variation of wear number and the porosity as a function of sintering temperatures.

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Fig. 5

The wear number, and wear coefficient as a function of disk operating temperature

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Fig. 6

The friction coefficient μ, and hardness; Hv at various sintering temperatures

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Fig. 7

Hardness, Hv, and wear number; Wn at various sintering temperatures

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Fig. 8

(a) SEM micrographs of worn brake surfaces at 850 °C; (b) SEM micrographs of worn brake surfaces at 900 °C; and (c) SEM micrographs of worn brake surfaces at 950 °C.

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