Rapid selection of environmentally friendly layered alkaline-earth metal phosphates as solid lubricants using crystallographic data

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.

Orientation of Ultrathin α-ZrP Nanosheets in Aqueous Epoxy Resin for Anticorrosive Coatings

“…The model diagrams of the multilayer and singlelayer nanosheets are shown in Figure 1b. 33 Because of the ion exchange between −NH 2 in M600 and the α-ZrP nanosheets, the multilayer α-ZrP nanosheets can be effectively peeled off into ultrathin α-ZrP/M nanosheets. Further, the same mass of α-ZrP/M and α-ZrP/M + nanosheets were added to the cathode aqueous epoxy emulsion and dispersed by stirring and then werer used as an electrolyte for electrophoretic deposition.…”

“…Finally, the −NH 2 in the poly­(etheramine) that interacts with the surface active sites of α-ZrP was ionized to −NH 3 + cations by acetic acid to obtain cationic α-ZrP/M + nanosheets (Figure a 3 ). The model diagrams of the multilayer and single-layer nanosheets are shown in Figure b . Because of the ion exchange between −NH 2 in M600 and the α-ZrP nanosheets, the multilayer α-ZrP nanosheets can be effectively peeled off into ultrathin α-ZrP/M nanosheets.…”

Layered Magnesium Phosphate as an Environmentally Friendly Solid Lubrication Additive: Morphology Control and Tribological Properties

“…Preparation of Calcium-Based Grease. The process for the preparation of calcium-based grease was as described previously 10 with some modifications. During stirring, the 2/3 PAO8 and predetermined amounts of 12-hydroxystearic acid and stearic acid were added to a grease kettle, the temperature was raised to 75 °C until the consistency became uniform, calcium hydroxide cream was slowly added, and the mixture was heated to 100−110 °C and kept at this temperature for 1.5 h. After saponification, the mixture was heated to a maximum refining temperature of 140 °C for 10 min, the remaining 1/3 PAO8 was added, the kettle was transferred to ice water and cooled to room temperature, and the mixture was ground three times on a triple-roller grinder to form the desired grease.…”