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本文分析了船用柴油机气缸套产生穴蚀的因素,针对这些产生穴蚀的因素采取相应的对策,以提高气缸套抗穴蚀的能力,减轻气缸套受穴蚀破坏的程度,延长船柴发动机的正常使用寿命。 相似文献
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本文分析了船用柴油机气缸套穴蚀的危害、发生的部位以及影响因素,并提出了多方面的预防措施,供船舶轮机管理人员参考、选用,以图减少船用柴油机气缸套免遭穴蚀侵害,以延长船用柴油机气缸套使用寿命,提高船舶柴油机的可靠性,从而提高船舶安全性。 相似文献
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对4125系列发动机气缸套穴蚀现象进行了理论分析,通过收集、分析相关资料,提出了一种预防气缸套穴蚀问题的方法。 相似文献
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大功率柴油机轴瓦的穴蚀机理及微观形貌 总被引:1,自引:0,他引:1
以中速大功率柴油机的主轴穴蚀为例,介绍了穴蚀的特征,特别结合微观形貌印证了穴蚀产生的机理,分析了穴蚀产生的原因,并提出了相应的预防措施。 相似文献
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1.穴蚀的特点 气缸套的穴蚀,是指发动机工作一段时间后,在气缸套与冷却水接触的外表面上产生许多光亮麻坑或孔穴的现象。穴蚀所形成的小孔直径较小,且孔的边缘较光洁;穴蚀严重时,可以穿透气缸壁,造成气缸漏水 相似文献
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《Wear》2007,262(1-2):191-197
Cavitation erosion tests were carried out by using Ti–Ni base SMAs (shape memory alloys) with the addition of third elements (Co, Fe, V and Cu) to Ti–Ni SMA. The erosion resistance and its mechanism are discussed. Erosion resistance of Ti–Ni base SMAs is about 1/4 to 1/2 as compared with that of Ti–Ni SMA, but it is about 6–16 times higher than that of SUS304. It was found that the erosion resistance of the martensite phase is superior to that of the austenite phase. We conclude that the erosion resistance of Ti–Ni base SMAs mainly depends on the defect density and the removal rate at the eroded area. 相似文献
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两种化学复合镀层的耐磨性能之比较 总被引:2,自引:0,他引:2
本文用化学复合镀技术,在45钢基体上沉积了镍-磷-巴基管和镍-磷-碳化硅两种复合镀层。作者详细实验研究了此两种复合镀层的摩擦,磨损工进行了比较。结果表明,两种复合镀层均具有优异的耐磨特性。并且镍-磷-巴基管复合镀层的耐磨特性更佳。 相似文献
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Dry friction and wear characteristics of nickel/carbon nanotube electroless composite deposits 总被引:3,自引:0,他引:3
X.H. Chen C.S. Chen H.N. Xiao H.B. Liu L.P. Zhou S.L. Li G. Zhang 《Tribology International》2006,39(1):22-28
Ni/carbon nanotube (Ni/CNTs) composite coatings were deposited on carbon steel plate by electroless deposition. The friction and wear properties were examined under dry sliding conditions using the ball-on-disk configuration. For reference, carbon steel plate was coated with Ni, Ni/SiC and Ni/graphite. The results show that the Ni/CNT coating has a microhardness value of 865 Hv, greater than for SiC reinforced composite deposits. The Ni/CNTs composite coating possesses not only a higher wear resistance but also a lower friction coefficient, resulting from their improved mechanical characteristics and the unique topological structure of the hollow nanotubes. 相似文献
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This paper investigates the microstructure and wear resistance of nickel–carbon nanotube (CNT) composite coating deposited by brush plating technique. The Ni/CNT coating deposited with a pulse current source has less porosity, higher hardness and higher wear resistance than that with a DC source. CNTs greatly improve the coating performance. The wear mechanism is mainly the smearing of the Ni/CNTs coatings, instead of the fracture for the Ni coatings. 相似文献
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本文用MM200磨损试验机,以Ni-P-PTFE化学镀层为实例,对表面镀层极限PV值的测试进行了初次尝试。文中提出以摩擦力矩剧烈波动作为镀层破坏标志,分析Ni-P-PTFE的极限PV值变化规律,并对试验方法作了探讨。 相似文献