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Correlation of wear resistant functions of HVOF and warm sprayed WC-Co coatings with in-flight particle characteristics

机译：HVOF和热喷涂WC-Co涂层的抗磨功能与飞行中颗粒特性的相关性

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摘要

WC-Co thermal sprayed coatings are mainly used for wear protecting functions in various industries, for which high velocity oxy fuel (HVOF) spray is considered to be the best suited process. However, WC-Co HVOF coatings still have some defects as compared with sintered bulk, such as decarburization of WC and porous structure. Recently, experiments of WC-Co coatings using warm spray (WS) and cold spray processes have demonstrated some improvements in reduction of these defects. In particular, WS process seems to be a more promising process for WC-Co coatings from the previous work. In this study, wear resistant functions of WC-12%Co coatings prepared by HVOF and WS were investigated by abrasion and erosion tests. In addition, in-flight particles were captured and their characteristics such as the amount of decarburization, crystal phase, particle strength and particle size distribution were investigated to clarify the difference between HVOF and WS processes. The result shows that the wear resistances of the WC-Co WS coatings are comparable or superior to those of the HVOF coatings, which can be attributed to the difference in the amount of W_2C and coatings porosity revealed by the in-flight particles and the coating microstructure. The result of the in-flight particle analysis also indicates that wear resistance of WS coatings can be further improved by optimizing the powder shape and chemical composition.
机译：WC-Co热喷涂涂层主要用于各种行业的磨损保护功能，因此，高速氧燃料（HVOF）喷涂被认为是最合适的工艺。然而，与烧结块相比，WC-Co HVOF涂层仍存在一些缺陷，例如WC的脱碳和多孔结构。最近，使用热喷涂（WS）和冷喷涂工艺进行的WC-Co涂层的实验表明，这些缺陷的减少有所改善。特别是，从以前的工作来看，WS工艺对于WC-Co涂层似乎是一个更有希望的工艺。在这项研究中，通过耐磨和腐蚀试验研究了由HVOF和WS制备的WC-12％Co涂层的耐磨性能。另外，捕获飞行中的颗粒，并研究其特征，例如脱碳量，晶相，颗粒强度和粒径分布，以阐明HVOF和WS工艺之间的区别。结果表明，WC-Co WS涂层的耐磨性与HVOF涂层相当或优于HVOF涂层，这可归因于W_2C量和飞行中颗粒与涂层所揭示的涂层孔隙率的差异微观结构。飞行中颗粒分析的结果还表明，通过优化粉末形状和化学成分可以进一步改善WS涂层的耐磨性。

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