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RISS 인기검색어
- 검색키워드
- 저자 : Chengqing Yuan (검색결과 2 건)
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Dong Hu,Zhiwei Guo,Tian Jun,Chengqing Yuan 한국섬유공학회 2021 Fibers and polymers Vol.22 No.1
As an important part of the marine propulsion system, the water-lubricated stern bearing has a major impact onship safety. In order to improve the reliability of water-lubricated stern bearing under actual working conditions, hydrophilicPVA fibers were added to a typical water-lubricated bearing material, the thermoplastic polyurethane (TPU), to fabricateTPU/PVA fiber composites. The sliding friction-wear test, under water-lubricated conditions, of the TPU composites/QSn7-0.2 friction pairs were analyzed using a designed testing apparatus. The friction coefficients, worn surfaces and the wearlosses from the test samples were examined. The results revealed that the addition of appropriate hydrophilic PVA fibers caneffectively improve the tribological properties of TPU materials. The hydrophilic PVA fibers not only improved the affinityand the material surface storage ability to water medium but also absorbed water and formed swelling convex texture underwater environment, thereby enhanced the hydrodynamic lubrication effect. When the mass fraction of PVA fiber reached15 % or more, the debris gathered under the action of loading and fiber connection, formed solid lubrication film. Thus, iteffectively improved the self-lubrication performance of the material. But that is not conducive to the tribologicalperformances of the composites when the mass fraction of PVA fiber reached 30 %. Generally, the materials with 15 % to20 % PVA fiber content showed better tribological properties under the experimental conditions. This work provides a newidea for the research of new water-lubricated bearing materials.
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Yang He,Zhiwei Guo,Wu Ouyang,Chengqing Yuan 한국섬유공학회 2022 Fibers and polymers Vol.23 No.6
Ultra-high molecular weight polyethylene (UHMWPE) has great potential in the field of water-lubricatedbearings. However, water-lubricated bearing made of pure UHMWPE produce significant heat and undergo physical damageunder low speed and heavy load conditions. These performance issues can be improved by reinforcement with fibers thathave excellent complementary properties to UHMWPE. Polyester fibers (PETFs) have high compressive strength and wearresistance, and corresponding oriented-fiber-reinforced-composites (OFRCs) wherein PETF acts as reinforcement show evenbetter mechanical and tribological properties. In this study, the influence of PETF density on UHMWPE was investigated bysystematic testing of different OFRCs. The results show that the optimal fiber density of composites with PETF orientedalong the axial direction was between 1.1 wt% and 2.2 wt%, and that for heavy loads, performance deteriorated withincreasing fiber density. Compared with UHMWPE, OFRCs with the optimal fiber density obtained from this study reducedfriction coefficient by up to 25.93 % and wear volume by 22.67 %, respectively. Considering the low cost, high durability,and relatively low content (<2.2 wt%) necessary for enhanced properties, reinforcement with oriented PETF is a viableapproach to enhance water lubrication performance of UHMWPE.
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