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Ti3C2Tx MXene with an ″accordion″ shape was prepared using hydrofluoric acid as an etching agent from the MAX phase (Ti3AlC2) powder. The Ti3C2Tx epoxy resin coatings were prepared using aqueous epoxy resin, aqueous epoxy resin curing agent and Ti3C2Tx as raw materials. The coefficients of friction and wear rates of the coatings were tested by a reciprocating abrasion tester and an optical digital microscope. The morphology and phase composition of the worn surfaces were analysed by scanning electron microscopy, micro confocal laser Raman spectroscopy and X-ray diffractometer to investigate the wear mechanism of coatings. The corrosion resistance of the coating in artificial seawater environment was evaluated by electrochemical workstation. It was shown that Ti3C2Tx epoxy coatings have lower coefficients of friction under artificial seawater environment compared with that under deionized water environment. At the same time, the addition of Ti3C2Tx significantly improves the corrosion resistance of the epoxy resin coating. Ti3C2Tx addition significantly improves the tribological properties of epoxy resin coatings in artificial seawater environments. With the increase of Ti3C2Tx content, both the friction coefficient and wear rate of the coating showed a tendency of decrease firstly and then increase. The lowest friction coefficient and wear rate of the epoxy resin coatings under artificial seawater environment were 0. 13 and 4. 99 × 10-5 mm~3/Nm respectively which were 65. 8% and two orders of magnitude lower than those of the pure epoxy resin coating respectively when the content of Ti3C2Tx was 1. 0 wt% [ABSTRACT FROM AUTHOR]

(MgCoNiCuZn) O high-entropy ceramics were prepared by discharge plasma sintering at 900'C-1 000'C. The effects of sintering temperature on the microstructure and phase composition of (MgCoNiCuZn)O high-entropy ceramics were investigated. On this basis, the tribological behavior of (MgCoNiCuZn)O with SiC at room temperature was investigated. The microscopic morphology, chemical composition and elemental valence states of the wear surface under different loads were analyzed by scanning electron microscopy and X-ray photoelectron spectroscopy. The results showed that the relative density and Vickers hardness of (MgCoNiCuZn) O high-entropy ceramics sintered at 1000 'C were maximum with the increase of sintering temperature as 95.5% and 570.12. The tribological properties of (MgCoNiCuZn) O prepared at 950°C with SiC ball mating at a load of 4N were better, the friction coefficient was 0.52 and the wear rate was 6.81X10-7mm³/ Nm. The main wear mechanisms were abrasive wear and slight adhesive wear. [ABSTRACT FROM AUTHOR]