Tribological property and wear mechanism of undercooled Ni-Pb monotectic alloys

• 作者: 刘维民 喇培清 杨根仓 许丽君 谢辉 郝维新
• 来源期刊: 中国有色金属学会会刊（英文版）
• 学科: 工学
• 关键词: Ni-Pb monotectic alloy high undercooling wear rate wear mechanism
• 年，卷（期）: 2004,（6）
• 页码范围: 1134-1138
• 页数: 5页
• 分类号: TG115.5
• 语种: 英文

摘要

The tribological properties of Ni-31.440% 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 80 K and 310 K 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 Ni2 O3 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.