Abstract
Lubricating technologies are essential for saving energy and identifying effective, environmentally friendly layered materials that meet the demands of solid lubricants is an important direction. Herein, we probed the relationships between load-carrying capacity and crystal structure. The results showed that increasing the sliding resistance of interlayers using corrugated layers increased the load-carrying capacity of layered solid lubricants. This finding expands on the traditional lubrication mechanism of layered materials. Following the rules, rapid selection of layered potassium magnesium and calcium phosphates (K-LMP and K-LCP) as effective solid lubricants was achieved using crystallographic data and strict filtering criteria. In order to prepare materials suitable for lubrication, the synthesis of K-LMP and K-LCP was optimised. These materials could be utilised in the food, textile or marine machinery industries in the future. The developed method could successfully guide the synthesis of application-oriented materials.
Highlights
With the rapid development of human civilisation, energy consumption is constantly increasing
The tribological properties of the above-mentioned layered materials were investigated under identical test conditions, and the relationships between crystal structures and tribological properties were analysed based on the experimental data
MoS2, graphite, magnesium silicate hydroxide (Mg6Si4O10(OH)[8]; hereafter referred to as MgSH), magnesium aluminium layered double hydroxides ([Mg0.66Al0.33(OH)2](Cl)0.33∙nH2O; hereafter referred to as MgAl-LDH), layered zirconium phosphate (α-Zr(HPO4)2∙H2O; hereafter referred to as α-ZrP) and layered disodium silicate (β-Na2Si2O5; hereafter referred to as β-LDS) as inorganic layered solid lubricants. We evaluate their friction and wear performance as additives in PAO8 lithium-based grease under identical test conditions using a four-ball tester, which is commonly employed in friction tests
Summary
With the rapid development of human civilisation, energy consumption is constantly increasing. Molybdenum disulfide (hereafter referred to as MoS2) is the predominant material used as a solid lubricant due to its lamellar crystalline structure with weak van der Waals-type bonds between planes. This substance can prevent metal on metal contact under high-load conditions[4,5,6]. It is important to develop other layered materials as effective and environmentally friendly solid lubricants Previous research in this area has mainly focused on magnesium silicate hydroxide, layered double hydroxides, layered disodium silicates, layered zirconium phosphates, and some others[7,8,9,10,11,12,13,14,15]. The lubricating action is due to weak van der Waals-type bonds between planes, and the corrugated layer, which generates slide resistance and acts as a buffer that facilitates a higher load-carrying capacity
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