Coated steel substrate by $$\hbox {FeCo/Al}_{2}\hbox {O}_{3}$$ nanoparticle with various Co concentrations realized by a thermal spraying process, preliminary powder alloy was elaborated by mechanical alloying technique for 20 h of milling time. The aims of this work are to study the effect of thermal spraying process and mechanical alloying on chemical composition, magnetic behaviour, structure and mechanical properties of coating. After mechanical alloying, the crystallite sizes of the powder were decreased from 18 to 7 nm and the lattice strains increased from 0.36 to 0.56%. This is due to the phenomenon of diffusion of cobalt in the iron lattice and the milling effect. After thermal spraying, many different phases appeared in the coating, such as $$\hbox {Al}_{2}\hbox {FeO}_{4}$$, $$\hbox {CoAl}_{2}\hbox {O}_{4}$$, CoFe and $$\hbox {CoFe}_{2}\hbox {O}_{4}$$. Magnetic behaviour was influenced by this change in the chemical composition of coating. The maximum saturation magnetization was found in $$\hbox {Fe}_{40}\hbox {Co}_{20}(\hbox {Al}_{2}\hbox {O}_{3})_{40}$$ sprayed powder, however, the minimum coercivity was found in $$\hbox {Fe}_{50}\hbox {Co}_{10}(\hbox {Al}_{2}\hbox {O}_{3})_{40}$$ sprayed powder. Mechanical properties’ parameters such as microhardeness and Young’s modulus were enhanced by the change in chemical composition during mechanical alloying and thermal spraying process.

中文翻译：

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热喷涂工艺对研磨 Fe、Co 和 $$\hbox {Al}_{2}\hbox {O}_{3}$$Al2O3 粉末涂层化学成分、磁性能、结构和力学性能的影响

通过热喷涂工艺实现具有不同 Co 浓度的 $$\hbox {FeCo/Al}_{2}\hbox {O}_{3}$$ 纳米颗粒涂覆钢基体，通过机械合金化技术制备了初步粉末合金，用于20 小时的研磨时间。这项工作的目的是研究热喷涂工艺和机械合金化对涂层化学成分、磁性能、结构和机械性能的影响。机械合金化后，粉末的晶粒尺寸从 18 nm 减小到 7 nm，晶格应变从 0.36% 增加到 0.56%。这是由于钴在铁晶格中的扩散现象和研磨效应。热喷涂后，涂层中出现了许多不同的相，如$$\hbox {Al}_{2}\hbox {FeO}_{4}$$, $$\hbox {CoAl}_{2}\hbox {O}_{4}$$, CoFe 和 $$\hbox {CoFe}_{2}\hbox {O}_{4}$$。磁性行为受到涂层化学成分的这种变化的影响。最大饱和磁化强度在$$\hbox {Fe}_{40}\hbox {Co}_{20}(\hbox {Al}_{2}\hbox {O}_{3})_{40 }$$喷涂粉末，然而，在$$\hbox {Fe}_{50}\hbox {Co}_{10}(\hbox {Al}_{2}\hbox {O}_ {3})_{40}$$ 喷粉。机械合金化和热喷涂过程中化学成分的变化提高了显微硬度和杨氏模量等机械性能参数。最小矫顽力在 $$\hbox {Fe}_{50}\hbox {Co}_{10}(\hbox {Al}_{2}\hbox {O}_{3})_{40} $$ 喷粉。机械合金化和热喷涂过程中化学成分的变化提高了显微硬度和杨氏模量等机械性能参数。最小矫顽力在 $$\hbox {Fe}_{50}\hbox {Co}_{10}(\hbox {Al}_{2}\hbox {O}_{3})_{40} $$ 喷粉。机械合金化和热喷涂过程中化学成分的变化提高了显微硬度和杨氏模量等机械性能参数。