Ceramic materials are more and more popular in industrial applications. Machine elements made of ceramic
materials are characterized by long durability, especially those elements that work in hard operating conditions.
In this paper, the results of tribological examinations of WC-42CrMo4 sliding pair are presented. Tribological
tests were realized with the T-11 stand with the ball-on-disc sliding pair. For lubrication, the machine mineral
oil L-AN 46 was used. The analysis showed that surface roughness significantly affected the tribological
performance of tested sliding pairs. Steel samples were characterized with various hardnesses in the range of
22-42 HRC and this feature also effected on friction coefficient. Statistical analyses of the achieved results
were made using the 3-level PS/DC 32 design. According to the statistical analysis, the quadratic functions
describing the dependence for friction coefficient on surface roughness and material hardness were obtained.
The most unfavourable surface roughness was after the grinding process, but the best was those after the
lapping process which allows the smallest friction coefficient.
The article presents selected characteristics of journal bearings calculated with the use of various methods and compared to the results obtained with application of the basic bearing characteristics calculation procedure, as described in the ISO 7902:2020 standard. Additionally, the presented calculation results were compared with the parameters measured during experimental tests of the sliding bearings, working under loads and at sliding velocity, and maintaining other operating conditions, as assumed in theoretical research. The regula falsi iteration method was successfully implemented. The research results have confirmed the usefulness of various calculation methods since the values of selected characteristics of the journal bearing obtained were comparable.
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