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首页> 外文期刊>Journal of Materials Science >The processing optimization and property evaluations of HVOF Co-base alloy T800 coating
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The processing optimization and property evaluations of HVOF Co-base alloy T800 coating

机译：HVOF钴基合金T800涂层的工艺优化和性能评估

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摘要

Co-base alloy Tribaloy-800 (T800) powders were coated on Inconel718 (IN718) by high velocity oxygen fuel thermal spraying. The optimal coating process (OCP) was obtained via studying the surface properties of 16 coatings prepared by Taguchi program. Surface hardness and porosity were 560–630 Hv and 1.0–2.7%, respectively, strongly depending on spraying processes. The OCP of hardness was oxygen flow rate (FR) 38 FMR, hydrogen FR 75 FMR, and feed rate 30 g/min at spray distance 5 inch. The adhesion strength of T800 coating with substrate had a slight increase and the thermal shock resistance of T800 coating was improved greatly by introduction of bonding layer Ni–Cr. Friction and wear behaviors have been investigated by a reciprocating sliding test at both 25 °C and an elevated temperature 538 °C (1,000 °F). Both friction coefficients (FC) and wear traces of the coating were smaller than those of IN718 substrate at both 25 and 538 °C. FC and wear traces of IN718 and coating decreased with increasing the surface temperature due to the lubricant effect of cobalt oxides formed on the sliding surface. As a result, T800 coating was highly recommended as a durability improvement coating for the protection of sliding surface, such as high speed spindle.
机译：通过高速氧气燃料热喷涂将共基合金Tribaloy-800（T800）粉末涂覆在Inconel718（IN718）上。通过研究Taguchi程序制备的16种涂层的表面性能，可以获得最佳的涂层工艺（OCP）。表面硬度和孔隙率分别为560–630 Hv和1.0–2.7％，这在很大程度上取决于喷涂工艺。硬度的OCP为氧气流速（FR）38 FMR，氢气FR 75 FMR，以及在喷涂距离为5英寸时的进料速率为30 g / min。通过引入粘结层Ni-Cr，T800涂层与基材的粘合强度略有提高，并且大大提高了T800涂层的抗热震性。在25°C和538°C（1,000°F）的高温下，通过往复滑动试验研究了摩擦和磨损行为。在25和538°C下，涂层的摩擦系数（FC）和磨损痕迹均小于IN718基材。随着表面温度的升高，由于在滑动表面上形成的氧化钴的润滑作用，IN718和涂层的FC和磨损痕迹减少。因此，强烈推荐使用T800涂层作为提高耐久性的涂层，以保护高速主轴等滑动表面。

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