Effect of normal load on damage mechanism of gradient copper-graphite composites under electric current

IF 5.3 1区工程技术 Q1 ENGINEERING, MECHANICAL Wear Pub Date : 2024-11-17 DOI:10.1016/j.wear.2024.205653

Junming Lu , Chunyu Ma , Lei Zhang , Zhihao He , Baisong Guo , Jiang Wei , Dahai Zeng , Wei Li , Yangzhen Liu

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Abstract

A gradient design of material is an effective way to solve the inhomogeneity of current-carrying damage. However, service conditions have a great influence on the current-carrying damage of gradient composites. To promote the development and application of current-carrying friction materials, it is necessary to elucidate the current-carrying damage mechanism of gradient composites with different service conditions. To this end, the gradient copper-graphite composites were prepared by hot pressing and sintering, and the variation in the current-carrying properties of the composites with loads were investigated in this study. The results showed that with increasing load, the wear rate of the composites initially decreased and then increased, while the current-carrying properties initially improved and then deteriorated. The composite exhibited better current-carrying tribological performance at the load of 55 N, and the wear rate of the composite was 1.59 × 10⁻⁴ mm³ N⁻¹ m⁻¹. Meanwhile, the current carrying efficiency and current carrying stability was 98.5 % and 2.2 %, respectively. The main wear mechanism of the composite at 55 N was plastic deformation.

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法向载荷对电流作用下梯度铜石墨复合材料损伤机理的影响

材料的梯度设计是解决载流损伤不均匀性的有效方法。然而，使用条件对梯度复合材料的载流损伤有很大影响。为了促进载流摩擦材料的开发和应用，有必要阐明不同服役条件下梯度复合材料的载流损伤机理。为此，本研究通过热压和烧结制备了梯度铜石墨复合材料，并研究了复合材料载流性能随载荷的变化。结果表明，随着载荷的增加，复合材料的磨损率先降低后升高，而载流性能则先改善后恶化。在载荷为 55 N 时，复合材料表现出更好的载流摩擦学性能，复合材料的磨损率为 1.59 × 10-4 mm3 N-1 m-1。同时，载流效率和载流稳定性分别为 98.5 % 和 2.2 %。复合材料在 55 N 载荷下的主要磨损机制是塑性变形。

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来源期刊

Wear 工程技术-材料科学：综合

CiteScore

8.80

自引率

8.00%

发文量

280

审稿时长

47 days

期刊介绍： Wear journal is dedicated to the advancement of basic and applied knowledge concerning the nature of wear of materials. Broadly, topics of interest range from development of fundamental understanding of the mechanisms of wear to innovative solutions to practical engineering problems. Authors of experimental studies are expected to comment on the repeatability of the data, and whenever possible, conduct multiple measurements under similar testing conditions. Further, Wear embraces the highest standards of professional ethics, and the detection of matching content, either in written or graphical form, from other publications by the current authors or by others, may result in rejection.