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| Study on friction and wear properties of Cu-C-SnO2 porous materials sintered by powders |
| ZHU Mingtao1，MENG Yunna1，FAN Yali1，LU Chen1，HOU Yushan1，NI Feng1，2 |
| 1.Henan University of Science and Technology，School of Materials Science and Engineering，Luoyang 471023，
China；2. National United Engineering Laboratory for Advanced Bearing Tribology，Luoyang 471023，China |
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Abstract Copper- graphite composite material is an excellent electrical conductive wear- resisting material. But
the wettability of copper and graphite is very poor, resulting in deficient wear resistance of the material. In this paper,
Cu- C-SnO2 porous materials were prepared by powder metallurgy adding SnO2 which had good affinity to
graphite. The effects of sintering temperature and composition proportion on porosity, physical properties, friction
and wear properties of the Cu-C-SnO2 porous materials were investigated. The experimental results show that the
porosity of the sintered body decreases with the increase of sintering temperature or non-metal/Cu mass ratio, and
increases with the increase of graphite/SnO2 mass ratio. The density, hardness, and oil penetration rate of sintered
body are closely related to the porosity. As the porosity increases, the density and hardness show a decreasing
trend, and the oil penetration rate shows an upward trend. However, the hardness of the sample changes complicatedly
due to the influence of Cu2O production and the recrystallization of Cu particles, and a sudden change occurs
near the sintering temperature of 830 ℃. Under dry friction conditions, the friction and wear characteristics of the
sample are affected by multiple factors such as material hardness and graphite phase self-lubrication, and the wearrate decreases with the increase of sample hardness or graphite content. After oil impregnated treatment, the friction
and wear characteristics of the sample are mainly controlled by oil film lubrication. Compared with dry friction,
the relative friction factor and wear rate are significantly reduced. The wear rate of the sample decreases with
the increase of the oil penetration rate, but there is a sudden saltation near the graphite/SnO2 mass ratio of 0.155.
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Received: 22 November 2020
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Corresponding Authors:
：倪锋（1963－），男，博士，教授，主要研究方向为金属凝固和粉末冶金。
E-mail: z18437906986@163.com
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2022, Vol. 32 
