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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 14    No. 6    December 2004

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Tribological property and wear mechanism of undercooled Ni-Pb monotectic alloys
XIE Hui(谢 辉)1, YANG Gen-cang(杨根仓)1, HAO Wei-xin(郝维新)1,
 LA Pei-qing(喇培清)2, LIU Wei-min(刘维民)2, XU Li-jun(许丽君)1

1. State Key Lab of Solidification Processing, Northwestern Polytechnical University,
 Xi'an 710072, China;
2. State Key Lab of Solid Lubrication, Lanzhou Institute of Chemical Physics,
 Chinese Academy of Sciences, Lanzhou 730000, China

Abstract: The tribological properties of Ni-31.44%Pb monotectic alloys were measured by using a SRV reciprocating tribo-tester. The effects of load, sliding speed and melt undercooling on wear rate of the sample were investigated. The worn surface of Ni-31.44%Pb was examined using scanning electron microscope (SEM) and X-ray photoelectron spectroscope (XPS). The results show that the wear properties of the samples undercooled by 80K and 310K are obviously superior, which is attributed to more efficient transfer of Pb from the bulk material to the worn surface. The lubricating film is identified as a mixture of Ni2O3 and PbO by XPS analysis. At the same load and sliding speed, the predominant wear mechanisms can be identified as oxidative wear for the lower and larger undercooling, and plastic deformation and fracture for the medium undercooling.

 

Key words:  Ni-Pb monotectic alloy; high undercooling; wear rate; wear mechanism

ISSN 1672-7029
CN 43-1423/U

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