Experimental study on the effect of load and rotation speed on dry sliding of silicon nitride

Abstract

Purpose The purpose of this study is to investigate the effects of load and rotation speed on dry sliding of silicon nitride, including a series of tribological behaviors (friction coefficient, wear rate, temperature rise, etc.) and wear mechanism. Through the analysis of the above characteristics, the influence law of load and speed on them and the internal relationship between them are determined, and then the best comprehensive performance parameters of silicon nitride full-ceramic spherical plain bearings in dry sliding are predicted, which can provide guidance for the operation condition of silicon nitride full-ceramic spherical plain bearings in dry sliding. Design/methodology/approach The experimental study of different loads and rotation speeds under dry friction conditions was carried out by the using ball-disk sliding test method. Findings With the increase of load, the friction coefficient of silicon nitride friction pair and the wear rate of silicon nitride ball decrease continuously. With the increase of rotation speed, the friction coefficient of silicon nitride friction pair first increases and then decreases, and the wear of silicon nitride ball first increases and then decreases. With the increase of load and rotation speed, the wear mechanism eventually changes to adhesive wear. Originality/value Because of the low timeliness and inefficiency of bearing experiments, this work adopts a simple ball-disk model to comprehensively explore the influence rules of different conditions, which provides a theoretical basis for the subsequent practical application of silicon nitride full-ceramic spherical plain bearings.

Experimental study on the tribological properties of high water-based piston friction pairs with different ceramic materials

“…This is due to when the lubricating medium is the fluid, the greater the sliding velocity is, the smaller the pressure of the micro-convex contact on the friction surface is, which enhances the film-forming ability of the lubricating film in the emulsion medium and reduces the friction coefficient. 28 Due to the high hardness of SiC, the wear debris is not easy to be broken during the wear process and remains in the formation of three-body wear. With the increase of frequency, the damage of the lubrication film on the contact surface is aggravated, and the friction coefficient increases.…”

“…In the figure, the friction coefficients of ZrO 2 and Si 3 N 4 decrease with the increase of frequency. This is due to when the lubricating medium is the fluid, the greater the sliding velocity is, the smaller the pressure of the micro-convex contact on the friction surface is, which enhances the film-forming ability of the lubricating film in the emulsion medium and reduces the friction coefficient 28. Due to the high hardness of SiC, the wear debris is not easy to be broken during the wear process and remains in the formation of three-body wear.…”

Thermal characteristics and distribution rule of lubrication film of full ceramic ball bearing under different service condition

“…Wang Zhishuang studied the effect of load and rotational speed on the dry sliding of silicon nitride. It was found that the coefficient of friction and the wear rate of silicon nitride balls of the silicon nitride friction substrate decreased continuously as the load increased; the coefficient of friction and wear were the first to increase and then decrease as the rotational speed increased (Wang et al, 2021).Tian Junxing studied the thermal distribution of full ceramic ball bearings under self-lubricating conditions. It was found that the load on the bearing under self-lubricating conditions is the main factor affecting the temperature rise of full ceramic ball bearing (Tian et al, 2022).…”