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FeCo/Al$_2$O$_3$ nanoparticle coating; mechanical alloying; thermal spraying; magnetic behaviour; structural and mechanical parameters.

Coated steel substrate by FeCo/Al$_2$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 Al$_2$FeO$_4$, CoAl$_2$O$_4$, CoFe and CoFe$_2$O$_4$. Magnetic behaviour was influenced by this change in the chemical composition of coating. The maximum saturation magnetization was found in Fe$_{40}$Co$_{20}$(Al$_2$O$_3$)$_{40}$ sprayed powder, however, the minimum coercivity was found in Fe$_{50}$Co$_{10}$(Al$_2$O$_3$)$_{40}$ sprayed powder. Mechanical properties’ parameters such as microhardeness andYoung’s modulus were enhanced by the change in chemical composition during mechanical alloying and thermal spraying process.

A YOUNES^{1 2} N DILMI² A BOUAMER¹

1. Research Center in Industrial Technologies (CRTI), PO Box 64, 16014, Cheraga, Algiers, Algeria
2. Laboratory of Surface Treatment and Materials, University of Saad Dahleb, PO Box 270, 09000 Blida, Algeria,

Published

10 February 2020

Manuscript received

12 June 2019

Accepted

20 September 2019

Final version published online

10 February 2020