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In the present study, sliding wear experiments are conducted on lead-free white metal under three types of lubricating fluids, that is, two types of lubricating oils and water, and the sliding wear characteristics and friction coefficient of the sliding surface of the white metal are investigated. Lubricating fluids were selected with viscosities varying widely from 1.0 × 10−3 to 409.7 × 10−3 Pa s. Based on the experimental results, the constitutive equations of sliding wear, the coefficient of friction, and the effects of lubricating oil viscosity η and compressive stress σ are investigated. The coefficient of friction is proportional to σ0.5 and η−0.5. Therefore, as η increases in the low σ region, the coefficient of friction decreases and the amount of wear decreases. Conversely, as η decreases in the high σ region, the coefficient of friction increases; thus, the amount of wear increases and the sliding surface seizes. Furthermore, a method for quantitatively predicting the sliding wear life of white metals is devised from the perspective of machine maintenance. The wear life required to achieve a certain wear depth can be estimated using the wear constitutive equation proposed by the authors, which is expected to facilitate the safety management of bearings and the extension of their operating life. • Sliding wear tests on the white metal/AISI1045C combination were conducted under three types of lubricants with significantly different viscosities. • A method for quantitatively predicting the sliding wear life of white metal is devised. • The wear life can be estimated using the wear constitutive equation. [ABSTRACT FROM AUTHOR]

The relationship between the wear behaviour of an ultra-high-molecular-weight polyethylene (GUR1050) pin and surface profile of a Co-28Cr-6Mo alloy (ASTM F-75) disc was investigated. Tribological tests have been performed by pin-on-disc wear testing machine with multi-directional pathways, obtaining the influence of micro slurry-jet erosion (MSE) processed Co–Cr–Mo alloy. The specific wear and the wear particles have been investigated. It was elucidated that the Co–Cr–Mo alloy surface processed by MSE influenced the specific wear rate of polyethylene; however, the morphological aspect of polyethylene wear particles was not drastically changed. The wear particles isolated from the lubricating liquid were added to a culture medium, and human monocyte-derived macrophages were incubated by using an upright/inverted method. The production of TNF-α and IL-6 seemed to have a correlation with the amount of wear particles added, however, the influence of particle size on the production of TNF-α and IL-6 was not obvious. This means that the improvements for the incubation method, i.e. upright/inverted method, need further investigation for the accurate analysis.