Effect of Copper Plated Graphite Content on Microstructure and Tribological Properties of Fe-25Cu-based Friction Materials

FU Chuan-qi, LI Sheng-jun, HUANG Ya-zhong, LIN Yong-wei

Surface Technology ›› 2023, Vol. 52 ›› Issue (2) : 245-253.

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PDF(7224 KB)
Surface Technology ›› 2023, Vol. 52 ›› Issue (2) : 245-253. DOI: 10.16490/j.cnki.issn.1001-3660.2023.02.022

Effect of Copper Plated Graphite Content on Microstructure and Tribological Properties of Fe-25Cu-based Friction Materials

  • FU Chuan-qi1, LI Sheng-jun2, HUANG Ya-zhong2, LIN Yong-wei2
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Abstract

In this experiment, the graphite of the conventional lubrication element was replaced by copper-plated graphite, the effect of different contents of copper-plated graphite on the organization of copper-iron friction materials was investigated, and the friction properties and friction mechanism of the friction materials were investigated when adding different contents of copper-plated graphite, and compared with the friction materials with graphite. The friction properties and friction mechanisms of the friction materials were investigated with the addition of different contents of copper-plated graphite and compared with those of graphite. The Fe-25Cu-based friction materials were prepared by powder metallurgy cold pressing method (pressure:500 MPa, holding pressure 5 min; sintering temperature 1 150 ℃, heating 60 min, holding time 60 min), and the friction properties of the friction materials were tested by scanning electron microscopy, X-ray diffraction and other characterization mean. 500 r/min, 1 000 r/min, and 1 500 r/min, respectively, with a normal load of 20 N and a sliding time of 1 000 s, and the friction coefficient was analyzed. The material after the friction test is observed on the surface using a scanning electron microscope to analyze the friction and wear mechanism. The amount of wear of the material after friction was calculated as a way to analyze the effect of the graphite content when copper was plated on the friction properties of the friction material. The experimental results show that the average friction coefficient decreases with the increase of copper-plated graphite content at the same speed, and the friction coefficient curve is smoothest when the content of copper-plated graphite is 9wt.%; the friction coefficient decreases gradually with the increase of copper-plated graphite content, and the wear is the first to decrease and decreases to the minimum value when the content of copper-plated graphite is 9wt.% and the wear rate increases when the content of copper-plated graphite continues to increase. Compared with the addition of graphite in the friction material, the friction material can maintain a higher friction coefficient when adding copper-plated graphite, and the friction coefficient is more stable; at 1 500 r/min speed, when adding 9wt.% of copper-plated graphite, the material has the best friction performance, the friction coefficient of the material is 0.436 at this time, and its wear rate is the lowest 0.023 mm; when adding 3wt.%-12wt.%, the wear mechanism of the friction material of copper-plated graphite is mainly two kinds of adhesion wear and abrasive wear. The friction mechanism is abrasive wear and peeling wear when the graphite content is 3wt.%-9wt.%, and adhesive wear occurs when the graphite content is 12wt.%. Copper-plated graphite and collective bonding with a metal transition layer, while graphite and the substrate belong to the mechanical occlusion, so the bonding of copper-plated graphite and the substrate is better while adding copper-plated graphite Fe-25Cu-based friction material maintains a higher coefficient of friction, at the same speed and the same graphite and copper-plated graphite content, Fe-25Cu friction material with the addition of copper-plated graphite wear less, and its friction performance The friction performance is better than that of graphite-added friction materials.

Key words

Fe-25Cu matrix; graphite; copper-plated graphite; friction coefficient; wear rate

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FU Chuan-qi, LI Sheng-jun, HUANG Ya-zhong, LIN Yong-wei. Effect of Copper Plated Graphite Content on Microstructure and Tribological Properties of Fe-25Cu-based Friction Materials[J]. Surface Technology. 2023, 52(2): 245-253
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