Tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair

Abstract

Purpose This paper aims to find out the tribological performance and self-lubricating mechanism of the laser-textured surface filled with solid lubricant in rolling friction pair. Design/methodology/approach The textures on the surfaces of GCr15 bearing steel were produced by acousto-optic Q diode-pumped yttrium aluminum garnet laser with the technology of “single pulse one time, repeating at intervals” and filled with composite solid lubricant. The tribology tests were conducted on the MMW-1A universal friction and wear testing machine. Findings It was found that the solid-lubricated micro-textured surface can reduce the friction coefficient effectively. The MoS2/PI composite solid lubricant works better than the single MoS2 solid lubricant, and the ratio of PI/MoS2 + PI at 20 per cent is the best recipe. The friction coefficient of the sample surfaces decreases first and then increases with the increase in texture densities, and a texture density of 19.6 per cent has the best effect on friction reduction. The friction coefficient of the textured surfaces gradually decreases with the increase in both rational speed and load. For the same texture density, the friction coefficient of textured surfaces decreases slightly with the increase in diameter. Furthermore, the mechanism of “rolling-extrusion-accumulation” occurred on the textured surface can collect the solid lubricant, thereby, improve the effect of lubricating and anti-friction. Originality/value The results of the experimental studies demonstrated the application prospect of laser surfaces texturing combined with solid lubricant in rolling friction pair.

Synergetic effects of surface texturing and solid lubricants to tailor friction and wear – A review

“…Metallic solid lubricants have been deposited onto various hard materials and coatings with surface textures, including steel [164,169,174,175], WC [165], VN [172], Ni3Al [170], TiN [166,167], TiAlCN [163], Ni [161] and Ta [162]. Textures in the form of dimples/pores [162-164, 166, 167, 169, 172, 173] or grooves [170] have been studied.…”

Effect of compound texture on lubrication and sealing performance of plunger pump

“…Then, to remove the burrs, the specimens were polished. The bulges around texture can be controlled to around 4 μm, which means the processing quality of this YAG laser is reliable 33,34 . Morphologies of micro‐dimple and groove are shown in Figure 11A,B, respectively.…”

“…The bulges around texture can be controlled to around 4 μm, which means the processing quality of this YAG laser is reliable. 33,34 Morphologies of micro-dimple and groove are shown in Figure 11A,B, respectively. To demonstrate the processing precision, the micro-dimple parameters after LST is shown in Figure 12.…”

“…According to the research of Etsion, 31,32 a texture density of 20% was recommended and a series of works latter have proved its accuracy. The influence of texture parameters on tribological performance of the cylinder linerpiston ring has been studied by our group, [33][34][35] and results suggested that when radius and depth range from 40 to 120 μm and 4 to 10 μm, respectively, better tribological performance can be achieved. Therefore, in this paper, parameters in Table 2 were initially used.…”

Numerical investigation for the flexible stretch-stamp forming process of sheet metal

“…General contact algorithm was adopted and the frictional behaviors at the interfaces of contact pairs were assumed to follow Coulomb's model. Friction tests were performed on a vertical universal friction and wear testing machine MMW-1A 30 with test geometry of a rotating washer on stationary ring under rotary sliding mode, and the friction coefficients of different interfaces are listed in Table 2. In addition, as there was no relative sliding motion, Rough friction formulation was adopted to model the friction behavior at the interface between the grippers and the sheet metal, which is a type of surface interaction to model tangential friction behavior with no slip displacement between two contacting surfaces, that is, a friction formulation specifying an infinite coefficient of friction to the interface.…”