In-Flight Oxidation of Fe-Based Amorphous Particle During HVAF Spraying: Numerical Simulation and Experiment
In-Flight Oxidation of Fe-Based Amorphous Particle During HVAF Spraying: Numerical Simulation and Experiment
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DOI：
10.1007/s11666-023-01623-0
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发表时间：
2023-06
影响因子：
3.1
通讯作者：
Nian-Chu Wu;F. Yang;Wenjing Sun;Guang Yang;Yan Liang;Suolai Zhang;Jian-Qiang Wang
中科院分区：
文献类型：
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作者：
Nian-Chu Wu;F. Yang;Wenjing Sun;Guang Yang;Yan Liang;Suolai Zhang;Jian-Qiang Wang
了解热喷涂过程中氧化膜的形成和演变对涂层的耐蚀性有重要意义。本文采用数值模拟和实验相结合的方法，对高速空气燃料热喷涂过程中飞行状态下铁基非晶粉末表面氧化层的生长进行了详细的研究。采用基于拉格朗日方法的氧化模型对铁基非晶颗粒进行了跟踪。模拟结果表明，氧化层厚度的增加是由飞行粒子的氧分压和粒子温度共同决定的。它主要发生在燃烧室和桶，而不是火焰流动后的流出场阶段。此外，通过模拟预测了颗粒在飞行中的氧化与喷雾参数之间的关系。最佳燃烧室压力为90 psi，最佳氧燃比为2.95。利用预测的喷涂工艺参数进行高速火焰喷涂，获得了低氧化的铁基非晶涂层。这为制备低缺陷非晶态金属涂层提供了有益的指导。
Understanding formation and evolution of oxidation in the thermal spray process is of significance since it affects greatly the corrosion resistance of coatings. In this work, the growth of oxide layers on in-flight Fe-based amorphous powders in high velocity air fuel (HVAF) thermal spray process was studied in detail by means of numerical and experimental methods. An oxidation model, based on the Lagrangian manner, was used to track the Fe-based amorphous particles. The simulation results showed that the increment of oxide layer thickness was codetermined by oxygen partial pressure of in-flight particles and particle temperature. It occurred primarily in the combustion chamber and barrel rather than the outflow field stage after flame flow. Furthermore, the relationship between in-flight particle oxidation and spray parameters was predicted by simulation. The optimal combustion chamber pressure is 90 psi and the optimal oxygen fuel ratio is 2.95. These were verified by the microstructural feature of in-flight collected particles, and low-oxidation Fe-based amorphous coating was obtained by HVAF utilizing the predicted spray parameters. This work offers us beneficial guidance of fabricating low-defect amorphous metallic coating.