Tribological Properties of UHMWPE Composites Modified with Graphite-containing Microcapsules for Ship Water-lubricatedStern Bearings

doi:10.3969/j.issn.1000-1093.2020.11.016

Abstract

Abstract: The severe abrasion wear of ultra-high molecular weight polyethylene (UHMWPE) materials for ship water-lubricated stern bearings usually occurs under low-speed and heavy-load conditions. The self-lubrication of materials could be improved by filling the graphite, but UHMWPE is difficult to be uniformly blended with graphite due to the agglomeration effect of graphite. Microencapsulation of graphite can improve its dispersion. The double emulsion method is employed to prepare the microcapsules, in which the core material is graphite and the wall material is urea-formaldehyde resin. Microcapsule composites are prepared by blending UHMWPE and microcapsules. In addition, the graphite composites are prepared as control groups. The friction and wear properties of the composites were tested under the load of 0.6 MPa and the rotation speed of 150 r/min or 250 r/min. The morphology of the worn surface was observed by the laser interferometer surface profiler and scanning electron microscope, and the wear mechanism was analyzed. The results show that the graphite-containing microcapsules have good dispersion in the matrix material, reduce the friction coefficient of the friction pairs and make the variation trend of friction coefficient more stable. Furthermore, a proper amount of graphite-containing microcapsules can improve the wear surface morphology and reduce the wear loss. The composites with 5% microcapsule content have the best tribological performance under the test conditions, and the friction coefficient is 0.110, and is decreased by 23.91% compared with pure UHMWPE at 150 r/min.

Key words: water-lubricatedsternbearing, UHMWPE, graphite, microcapsule, tribologicalproperty

CLC Number:

YANG Zhenxiang, GUO Zhiwei, YUAN Chengqing. Tribological Properties of UHMWPE Composites Modified with Graphite-containing Microcapsules for Ship Water-lubricatedStern Bearings[J]. Acta Armamentarii, 2020, 41(11): 2281-2291.

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