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首页> 外文学位 >Synthesis of silver nanoparticles integrated molybdenum disulfide nanoparticles and fundamental understanding the behavior of silver-molybdenum disulfide nanoparticles based hybrid system.
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Synthesis of silver nanoparticles integrated molybdenum disulfide nanoparticles and fundamental understanding the behavior of silver-molybdenum disulfide nanoparticles based hybrid system.

机译：银纳米粒子的合成集成了二硫化钼纳米粒子，并基本了解了基于银-二硫化钼纳米粒子的混合体系的行为。

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摘要

This work is designed to study tribological properties of silver nanoparticles integrated molybdenum disulfide nanoparticles based hybrid system. The research work is based on the synthesis of silver nanoparticles and their integration in the molybdenum disulfide nanoparticles matrix (Ag-MoS 2 hybrid systems) and the fundamental understanding of their tribological behaviors. First of all, silver is a relatively soft material and exhibits low shear strength; it has good embeddability which allows Ag nanoparticles to embed wear particles into a softer lining. Secondly, MoS2 reacts with silver at higher temperatures to form various phases of silver molybdates which are effective lubricants for high temperature applications. Therefore, with a small addition of Ag nanoparticles to molybdenum sulfide, Ag-MoS 2 nanoparticles based hybrid systems can reduce the coefficient of friction (COF), prolong the life of traditional MoS2 nanoparticles even through high temperatures, and increase the strength of MoS2 tribofilms.;X-ray diffraction (XRD), energy dispersive x-ray spectroscopy (EDS), transmission electron microscopy (TEM), and particle size analysis were used to examine structural properties, silver content, particle size, and particle size distribution. Friction and wear properties were studied by pin-on-disc, and analysis of wear tracks were characterized by scanning electron microscopy (SEM) and EDS techniques. Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) results confirmed that silver molybdates were formed at higher temperatures (around 450-600 °C) and are known to be good antifriction agents at higher temperatures.;The Pin-on-disk experiments were conducted at room temperature for Ag-MoS 2 in comparison with MoS2 nanoparticles, and tribofilms were analyzed. Tribological study at room temperature showed a significant enhancement in performance due to Ag integrated into MoS2 nanoparticles. Further tribological testing at higher temperature will be performed in the future. In summary, Ag-MoS2 alloyed nanoparticles were synthesized successfully with varying Ag concentrations and showed formation of silver molybdate phases. Ag-MoS2 nanoparticle alloys showed better tribological properties over its counterparts. Future studies will focus on a fundamental study of Ag-MoS2 and other metallic candidates at room temperatures and higher.
机译：这项工作旨在研究银纳米颗粒集成二硫化钼纳米颗粒混合体系的摩擦学性能。该研究工作基于银纳米颗粒的合成及其在二硫化钼纳米颗粒基质（Ag-MoS 2杂化体系）中的整合以及对它们的摩擦学行为的基本理解。首先，银是一种相对较软的材料，具有较低的剪切强度。它具有良好的可嵌入性，可使Ag纳米颗粒将磨损颗粒嵌入较软的衬里。其次，MoS 2在更高的温度下与银反应形成钼酸银的不同相，这对于高温应用是有效的润滑剂。因此，通过在硫化钼中少量添加Ag纳米颗粒，基于Ag-MoS 2纳米颗粒的混合系统可以降低摩擦系数（COF），即使在高温下也可以延长传统MoS2纳米颗粒的寿命，并提高MoS2摩擦膜的强度X射线衍射（XRD），能量色散X射线光谱法（EDS），透射电子显微镜（TEM）和粒度分析用于检查结构性质，银含量，粒度和粒度分布。通过销钉盘研究了摩擦和磨损性能，并通过扫描电子显微镜（SEM）和EDS技术对磨损轨迹进行了分析。差示扫描量热法（DSC）和热重分析（TGA）结果证实，钼酸银是在较高温度（约450-600°C）下形成的，已知在较高温度下是良好的减摩剂。与MoS2纳米颗粒相比，在室温下对Ag-MoS 2进行了测试，并分析了摩擦膜。室温下的摩擦学研究表明，由于将Ag集成到MoS2纳米颗粒中，因此性能显着提高。将来将在高温下进行进一步的摩擦学测试。总之，成功地合成了具有不同Ag浓度的Ag-MoS2合金纳米颗粒，并显示出钼酸银相的形成。 Ag-MoS2纳米颗粒合金的摩擦性能优于同类合金。未来的研究将集中在室温及更高温度下对Ag-MoS2和其他金属候选物的基础研究。

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  • 作者

    Zhang, Wenyang.;

  • 作者单位

    University of Arkansas.;

  • 授予单位 University of Arkansas.;
  • 学科 Engineering Mechanical.;Engineering Materials Science.
  • 学位 M.S.
  • 年度 2010
  • 页码 83 p.
  • 总页数 83
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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