Effect of Copper Content and Sintering Temperature on Friction and Wear Properties of Powder-metallurgical Fe-Cu Based Composites

doi:10.11901/1005.3093.2019.324

Chinese Journal of Materials Research

2020, Vol. 34

Issue (2): 137-150 DOI: 10.11901/1005.3093.2019.324

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Effect of Copper Content and Sintering Temperature on Friction and Wear Properties of Powder-metallurgical Fe-Cu Based Composites

SHI Lei¹,ZHAO Qi¹(

),LUO Cheng¹,CHEN Hao¹,YANG Jibiao¹,ZHANG Xiaodong²,LI Xianbin²

1. School of Materials Science and Engineering, Hubei University of Automotive Technology, Shiyan 442002，China
2. Dongfeng Powder Metallurgy Company, Dongfeng Motor Parts and Components (Group) Co. Ltd. , Shiyan 442700, China

Cite this article:

SHI Lei,ZHAO Qi,LUO Cheng,CHEN Hao,YANG Jibiao,ZHANG Xiaodong,LI Xianbin. Effect of Copper Content and Sintering Temperature on Friction and Wear Properties of Powder-metallurgical Fe-Cu Based Composites. Chinese Journal of Materials Research, 2020, 34(2): 137-150.

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Abstract

The effect of Cu content and sintering temperature on the friction and wear properties of powder-metallurgical Fe-Cu based composites was investigated. The results show that the wear resistance first increases with the increase of Cu content within a range of 20%~60% Cu. Then the wear resistance reaches the optimum with the average friction coefficient of 0.172 and wear loss of 0.007 g for the composite with 40% Cu. However, the wear resistance begins to decrease when the Cu content further increases. Similarly, the wear resistance first increases with the increase of sintering temperature within the range of 1096~1296^oC. Then the wear resistance achieves the optimum with the average friction coefficient of 0.123 and wear loss of 0.0018 g for the composite sintered at 1196^oC. When sintering at higher temperatures, the wear resistance decreases again. During sintering with optimal process parameters, the molten Al may form solid solution with Fe and Cu, which improves the density and strength of the composite. Meanwhile, the decomposition of MnS yields atomic Mn, which mainly forms solid solution with Fe. Also, a part of C in the composite also forms solid solution with Fe. The above facts may in turn generate the solid solution strengthening of the Fe-Cu based alloy. Besides, there exists residual elemental carbon in the Fe-Cu based alloy, which enhances the lubrication of the alloy. After sintering, the grains of Cu become finer presenting as a network in the Fe based matrix. The excellent wear resistance of Fe-Cu based composite can be attributed to the special functions of the individual component of the composite.

Key words: composite Fe-Cu based friction and wear Cu content sintering temperature

Received: 01 July 2019

ZTFLH:

TF124

Fund: PhD Research Startup Foundation of Hubei University of Automotive Technology(BK201702);Hubei Provincial Natural Science Foundation of China(2018CFB177);Key Laboratory of Automotive Power Train and Electronics (Hubei University of Automotive Technology),and Undergraduate Training for Innovation and Entrepreneurship(DC2019052)

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	Lei SHI
	Qi ZHAO
	Cheng LUO
	Hao CHEN
	Jibiao YANG
	Xiaodong ZHANG
	Xianbin LI

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.324 OR https://www.cjmr.org/EN/Y2020/V34/I2/137

Fig.1 Density curves of iron-copper based materials with different copper content

Fig.2 Density curves of iron-copper based materials at different sintering temperatures

Fig.3 Relationship between microhardness of iron-copper based materials and copper content

Fig.4 Relationship between microhardness of iron-copper based materials and sintering temperature

Fig.5 Uncorroded microstructure of Fe-Cu based materials with different Cu weight content after polishing: (a) 20%; (b) 30%; (c) 40%; (d) 50%; (e) 60%

Fig.6 Average grain size and pore size of Fe and Cu based materials with different Cu content

Fig.7 Uncorroded microstructure of Fe-Cu based materials at different sintering temperature after polishing

Fig.8 Average grain size and pore size of Fe and Cu based materials with different sintering temperatures

Fig.9 Friction factors at different copper contents (a) 20%; (b) 30%; (c) 40%; (d) 50% ; (e) 60%

Fig.10 Friction factors at different sintering temperatures (a) 1096℃; (b) 1146℃; (c) 1196℃; (d) 1246℃; (e) 1296℃

Fig.11 XRD of Fe-Cu material with 40% copper content before and after sintering at 1196℃ for 1 h (a) before sintering; (b) after sintering

Fig.12 Components mapping for the sample with copper content of 40% before sintering

Fig.13 Components mapping for the sample with copper content of 40% after sintering at 1196℃ for 1 h

Fig.14 Phase diagram of Cu-Fe binary alloy

Fig.15 Wear morphology of friction materials with different copper contents (a, d) 30%; (b, e) 40%; (c, f) 50%

Fig.16 Wear morphology of friction materials with different sintering temperatures (a, d) 1146℃; (b, e) 1196℃; (c, f) 1246℃

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