尼龙自润滑性与表面织构协同作用对HDPE基水润滑轴承摩擦磨损性能的影响

传统的船舶尾轴油润滑轴承的润滑油泄露造成了严重的海洋污染，逐渐被水润滑轴承取代，但水较差的承载能力要求水润滑轴承具有良好的减磨耐磨性能. 通过HDPE与PA66的共混材料研究尼龙润滑填料和表面织构协同作用对水润滑轴承摩擦磨损性能的影响，利用超景深三维显微系统测量共混材料试样浸泡后的表面纹理结构，利用CBZ-1摩擦磨损试验机对试样进行摩擦试验并记录摩擦系数，利用表面轮廓仪和扫描电镜(SEM)观察试样磨损形貌并分析其磨损机理. 试验表明:PA66的添加能优化共混材料的摩擦学性能. PA66的水溶胀性使共混材料表面形成微凸织构，降低摩擦系数和减轻表面磨损；PA66的存在可使共混材料在摩擦过程中在对摩铜盘表面形成转移膜，有效保护摩擦副表面，减轻磨损. 

The Synergistic Effect Mechanism of PA66 Self-Lubrication Property and Surface Texture on Tribological Performance of HDPE Water-Lubricated Bearing

The oil leakage of traditional oil-lubricated bearing of ship stern shaft causing serious marine pollution and are gradually replaced by water-lubricated bearing. However, due to the poor load-bearing capacity, tribology performance of water-lubricated bearing should be improved. The synergetic effect of PA66 lubricating filler and surface texture on the friction and wear properties of water-lubricated bearing prepared by HDPE/PA66 composite was studied. The surface texture of the composite sample after immersion was observed by using the ultra-deep 3D microscopy. The specimen was tested using the CBZ-1 tester and the friction coefficient was recorded. The surface profiler and scanning electrical microscopy were used to observe and analyze the wear mechanism after the test. The results show that the tribological properties of the composite were enhanced by adding PA66. The dilation property in water of PA66 enabled the bulge texture on surface of HDPE/PA66 polyblends, which reduced friction coefficient and wear. The presence of PA66 in the polyblends rendered a transfer film on the surface of the copper disc during the friction process, which effectively protected the surface of the friction pair and reduce wear. The polyblend of HDPE-30% PA66 had the lowest friction coefficient and low wear. The polyblend of HDPE-20% PA66 can be candidate material for practical engineering application because of its low friction coefficient, good wear property and dimensional stability.