Effect of the long-term heat treatment on the cyclic oxidation behavior of Fe-based amorphous/nanocrystalline coatings prepared by high-velocity arc spray process
作者： Wenmin Guo , Yuping Wu , Jianfeng Zhang , Wenhua Yuan
DOI: 10.1016/J.SURFCOAT.2016.09.018
关键词:
摘要: Abstract In this study, Fe-based nanocrystalline coatings were obtained by crystallization of amorphous through heat treatment with different annealing time 0.5 h, 5 h, 10 h and 100 h, respectively. Cyclic oxidation behaviours the coating as well these annealed ones at 750 °C in still air investigated compared. The results showed that grain size was significantly increased pre-annealing prolonged. However, cyclic kinetic curves indicated resistance unexpectedly improved increase size. coating, which 700 °C for exhibited lowest accumulated weight gain 2.8 mg/cm2 parabolic rate constant kp values 1.7 × 10− 11 g2 cm− 4 s− 1, indicating highest resistance. enhanced mainly attributed to elimination cracks, pores splat boundaries caused intersplat sintering during treatment. Cracks primary diffusion paths oxygen, resulted models oxygen or metal atoms coatings.
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