Preparation and performances of ternary layered ceramic Ti₃AlC₂/ultrahigh molecular weight polyethylene composites

In order to improve the performances of ultrahigh molecular weight polyethylene (UHMWPE), surface modification of Ti₃AlC₂ filled UHMWPE was studied. Ti₃AlC₂/UHMWPE composites were prepared by hot-press moulding technique. SEM results show that Ti₃AlC₂ distributes homogeneously in the matrix and the modified fillers have a better boundary integrate with the polymer matrix. Thermal analysis results show that the crystallinity and enthalpy of Ti₃AlC₂/UHMWPE composite decreases with the addition of Ti₃AlC₂, while the thermal conductivity of the composites increases. DMA results show that Ti₃AlC₂ improves the creep performence of Ti₃AlC₂/UHMWPE composites effectively, which is benefited from the increase of hardness and rigidity of the polymer matrix and the capability of resistance to deform under external stress is enhanced. Additionally, tribology analysis shows that the right amount of Ti₃AlC₂ (mass fraction≤15wt%) filled UHMWPE can improve the anti-friction performance of the composites effectively, while the worn surface morphology analysis of Ti₃AlC₂/UHMWPE composites shows that the friction and wear mechanism of the composite transform from adhesive wear to abrasive wear.