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首页> 外文学位 >Characterization of Nano-Porous Si-Cu Composites to Enhance Lubricant Retention Impacting the Tribological Properties of Sliding Surfaces.
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Characterization of Nano-Porous Si-Cu Composites to Enhance Lubricant Retention Impacting the Tribological Properties of Sliding Surfaces.

机译：纳米多孔硅铜复合材料的表征，以提高润滑剂的保留率，从而影响滑动表面的摩擦学性能。

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摘要

As the expectations for modern machinery's tribological and thermal performances continue to rise, the retention of lubricant on the contact surfaces of their sliding components becomes an increasingly important issue. Friction and wear cause heat-related failures which lead to catastrophic damage to machinery. Evaporation of a lubricant's volatile constituents as well as lubricant migration leads not only to a reduction in lubricant quantity but also in its quality, thus facilitating component failures. In order to enhance component reliability, the surface should incorporate features that actively retain lubricants. The unique properties of nano-porous topographies such as their high surface area-to-volume ratio indicate they hold great potential to address these lubrication issues.;Thermodynamics-based numerical models of smooth and nano-porous Si-Cu composite topographies were developed to predict the trends of lubricant retention. Photolithographic processes as well as physical etching and thin film deposition tools were utilized to fabricate smooth and patterned Si-Cu composite sample types. The nano-porous topographies incorporated various nano-pore geometries for determination of the optimum conditions for lubricant retention. Amorphous Si film was deposited on the samples using chemical vapor deposition which served as a surface chemistry modification to examine the film's potential to enhance lubricant retention. Lubricant retention tests were performed using a custom-fabricated apparatus for evaporating lubricant from the sample types. Finally, the model's predictions of lubricant retention trends were compared to actual testing results to examine the validity of those predictions.;The predictions of the models were supported by the evaporation testing data obtained from the samples. It was found that surface nano-pores having the proper geometry, in combination with the dehydrogenated amorphous Si surface chemistry, could significantly enhance retention above the one micrometer fluid film thickness typically formed between interacting surfaces of machine components undergoing relative motion. The surface features show potential to prevent many types of mechanical failures, reduce maintenance costs, and achieve higher energy efficiency.
机译：随着对现代机械的摩擦学性能和热学性能的期望不断提高，润滑剂在其滑动部件的接触表面上的保留变得越来越重要。摩擦和磨损会导致与热相关的故障，从而导致机械灾难性损坏。润滑剂挥发性成分的蒸发以及润滑剂的迁移不仅导致润滑剂数量的减少，而且导致其质量的下降，从而促进了部件故障。为了提高组件的可靠性，表面应具有可主动保留润滑剂的特征。纳米多孔形貌的独特性质，例如高的表面积/体积比，表明它们具有解决这些润滑问题的巨大潜力。;开发了基于热力学的光滑和纳米多孔硅铜复合形貌的数值模型预测润滑剂保留的趋势。利用光刻工艺以及物理蚀刻和薄膜沉积工具来制造光滑且有图案的Si-Cu复合样品类型。纳米多孔形貌并入了各种纳米孔几何形状，以确定润滑剂保留的最佳条件。使用化学气相沉积将非晶硅膜沉积在样品上，该化学气相沉积用作表面化学改性，以检查膜增强润滑剂保留能力的潜力。润滑剂保留测试是使用定制设备进行的，用于从样品类型中蒸发掉润滑剂。最后，将模型的润滑剂保留趋势预测与实际测试结果进行比较，以检验这些预测的有效性。；模型的预测得到了从样品中获得的蒸发测试数据的支持。已经发现，具有适当几何形状的表面纳米孔与脱氢的非晶硅表面化学性质相结合，可以显着提高在经历相对运动的机器部件的相互作用表面之间通常形成的一个微米流体膜厚度以上的保持力。表面特征显示了防止多种类型的机械故障，降低维护成本并实现更高能源效率的潜力。

著录项

  • 作者

    Morehead, Julius Sheldon.;

  • 作者单位

    University of Arkansas.;

  • 授予单位 University of Arkansas.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2015
  • 页码 304 p.
  • 总页数 304
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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