2026-10-14T02:34:44Z https://www.scidb.cn/oai

10.57760/sciencedb.011xu 2026-09-08T17:57:57Z

2026-09-08 Oil Film Thickness Mechanism of Silicon Nitride Ceramic Ball for Bearing doi:10.57760/sciencedb.011xu en Aiming at the problem that the lubrication characteristics of silicon nitride hybrid ceramic ball bearings are not clear, an optical measurement method is used to study the variation of oil film thickness and morphology of silicon nitride ceramic balls under different entrainment velocities and load combinations through the ball-disk contact optical interference oil film measurement device, and the influence mechanism of adhesion characteristics of silicon nitride ceramic balls on oil film thickness. At the same time, a comparative study of oil film thickness with steel balls under the same working conditions is also carried out. The results show that: (1) At high entrainment velocity, there is a lack of oil at the entrance of the contact area, and the thickness of the test film no longer increases with the increase of the speed, so that the thickness of the silicon nitride ceramic ball test film is lower than the theoretical calculation value; however, without considering the high-speed starved oil condition, the test film thickness of the steel ball conforms to the theoretical calculation, and the test film thickness of the silicon nitride ceramic ball is only 70%~87% of the theoretical calculation, which is obviously low, indicating that the traditional theory has limitations in evaluating the oil film thickness of the silicon nitride ceramic ball. (2) The difference in adhesion characteristics of materials directly affects their adhesion ability to lubricating oil, thus affecting the thickness of lubricating film; compared with steel balls, the adhesion characteristics of the silicon nitride ceramic balls are lower, the adhesion ability to lubricating oil is weaker, and the oil film thickness formed under the same working conditions is relatively thin. (3) In the start-stop test, when the oil film thickness of the silicon nitride ceramic ball reaches a stable state, the oil film thickness formed by its adhesion ability is only one-third of that of the steel ball, at low entrainment velocity, the deviation between the silicon nitride ceramic ball and the traditional theoretical calculation is mainly dominated by the material adhesion characteristics; at high entrainment velocity, the adhesion effect only occupies a small part. The research findings provide a reference for the subsequent lubrication design of hybrid ceramic ball bearings. hybrid ceramic ball bearing; silicon nitride ceramic ball; oil film thickness; adhesion characteristics Che Fulin Qiu Ming Zhang Jingjing Bi Minglong Yuan Jinlong PUBLIC https://creativecommons.org/licenses/by-nc-nd/4.0/ dataset http://www.doi.org/10.16078/j.tribology.2025180 Science Data Bank