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首页> 外文学位 >Influence of Spray Kinematic Parameters on High Velocity Oxy-Fuel sprayed WC-Co Coatings' Properties Applied on Complex Geometries
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Influence of Spray Kinematic Parameters on High Velocity Oxy-Fuel sprayed WC-Co Coatings' Properties Applied on Complex Geometries

机译：喷涂运动学参数对复杂几何形状上高速氧-燃料喷涂WC-Co涂层性能的影响

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摘要

As the regulatory limitations of hard-chrome plating surge, the successful application of thermal- sprayed wear/corrosion resistant coatings on complex geometries becomes critical. Thermal spraying is a line-of-sight method and thus, spraying a complex geometry results to changes in the spray angle, the spray distance and the effective gun traverse speed. Although there has been some research on the effects of these kinematic parameters on the coatings, previous work tends to examine the kinematic parameters in isolation, disregarding of any interplay between them. Yet, the effective particle velocity at impingement is dictated both by spray angle and spray distance while the particle temperature is mainly dictated by spray distance. In addition, the heat and mass transfer to the underlying coating are controlled by the gun traverse speed. These facts suggest that significant synergistic effects are expected when the spray kinematic parameters vary simultaneously, as when a complex geometry is sprayed. This work aims at evaluating the systemic effect of the spray kinematic parameters on WC-Co coatings sprayed by HVOF. Various coating properties are comprehensively examined and discussed, exploring the microstructures, phase composition, mechanical qualities and tribological performance. Significant interplay between the spray kinematic parameters is demonstrated in a number of coating properties, yielding non-linear behaviours. The notable beneficial role of small spray angle inclinations at long spray distances, in regards to deposition rate, microstructure, microhardness and wear resistance is demonstrated. Mechanisms of the particle rebounding, superficial oxidation of the coating, metallic tungsten crystallization, tribofilm formation and wear damage progression are proposed, with respect to the spray kinematic parameters. Finally, an attempt to generalize the insights from this work to any given sprayable geometry takes place in a prototype software tool in Matlab.
机译：由于硬铬镀层的法规限制激增，在复杂几何形状上成功应用热喷涂耐磨/​​耐腐蚀涂层至关重要。热喷涂是一种视线方法，因此喷涂复杂的几何形状会导致喷涂角度，喷涂距离和有效喷枪移动速度发生变化。尽管已经对这些运动学参数对涂层的影响进行了一些研究，但是先前的工作倾向于孤立地检查运动学参数，而忽略它们之间的任何相互作用。然而，撞击时的有效粒子速度由喷射角度和喷射距离决定，而粒子温度主要由喷射距离决定。此外，热量和质量传递到下面的涂层是由喷枪移动速度控制的。这些事实表明，当喷涂运动学参数同时变化时（如喷涂复杂的几何形状时），预期会产生显着的协同作用。这项工作旨在评估喷涂运动学参数对HVOF喷涂WC-Co涂层的全身效果。对各种涂层性能进行了全面的检查和讨论，探讨了其微观结构，相组成，机械性能和摩擦学性能。喷涂运动学参数之间的重要相互作用在许多涂层性能中得到了证明，产生了非线性行为。在沉积速率，微观结构，显微硬度和耐磨性方面，证明了在长喷射距离下小喷射角倾斜度的显着有益作用。针对喷涂运动学参数，提出了颗粒回弹，涂层表面氧化，金属钨结晶，摩擦膜形成和磨损破坏进程的机理。最后，尝试在Matlab的原型软件工具中将这项工作的见识推广到任何给定的可喷涂几何形状。

著录项

  • 作者

    Katranidis, Vasileios.;

  • 作者单位

    University of Surrey (United Kingdom).;

  • 授予单位 University of Surrey (United Kingdom).;
  • 学科 Chemical engineering.
  • 学位 Ph.D.
  • 年度 2018
  • 页码 315 p.
  • 总页数 315
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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