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The Influence of Spraying Angle on Properties of HVOF Sprayed Hardmetal Coatings

机译:喷涂角度对超音速火焰喷涂硬质合金涂层性能的影响

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摘要

The spraying angle is one of the deposition parameters that influence the quality of thermally sprayed coatings. In theory, decreasing the spraying angle results in lower process deposition efficiency, whereas the porosity of coatings increases, becoming a cause of poorer microstructure and mechanical properties. In this study, the dependence of microstructure together with the basic mechanical properties and wear of WC-Co and Cr_3C_2-NiCr high-velocity oxyfuel (HVOF) sprayed coatings on the spraying angle was investigated. For each coating, the maximum spraying angle was determined that can be used without significantly decreasing coating quality. Based on the changes in properties of coatings and requirements for the process deposition efficiency, a maximum 30° diversion from the normal spray direction is recommended for WC-Co and 15° diversion for Cr_3C_2-NiCr coatings.
机译:喷涂角度是影响热喷涂涂层质量的沉积参数之一。从理论上讲,减小喷涂角度会导致较低的工艺沉积效率,而涂层的孔隙率则会增加,这是导致微观结构和机械性能较差的原因。在这项研究中,研究了WC-Co和Cr_3C_2-NiCr高速含氧燃料(HVOF)喷涂涂层的微观结构以及基本力学性能和磨损对喷涂角度的依赖性。对于每种涂层,确定可以使用的最大喷涂角度而不会明显降低涂层质量。根据涂层性能的变化和对工艺沉积效率的要求,对于WC-Co,建议从正常喷涂方向最大偏转30°,对于Cr_3C_2-NiCr涂层,最大偏转15°。

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