Effect of zinc oxide and alumina nanoparticles on Structural, magnetic and mechanical properties of the iron matrix synthesized by mechanical milling and thermal spraying

Abstract

The effect of Al 2 O 3 and ZnO on the microstructure, magnetic and mechanical properties of the iron is the objective of this work. For the Fe / Al 2 O 3 and Fe/ZnO nanostructured composite, the powder alloy have milled by PM400 planetary ball Mill at different milling times with 15 min of milling follow to 15 min of the break, at a speed of 320 rpm, after 30 h, the average crystallite size of Fe/Al 2 O 3 and Fe/ZnO was 5 nm and 10 nm, respectively. Up to 30 h, the lattice strain increased to about 0.64% for Fe/ Al 2 O 3 and 0.59% for Fe/ZnO. The coercivity (Hc) increased from 6.407 to 82.027Oe for Fe/Al 2 O 3 , and increased from 6.947Oe to 246.286Oe for Fe/ZnO, on the other hand the saturation magnetization (Ms) decreased from 20.732 to 15.181 emu/g for Fe/Al 2 O 3 and 10.593 to 18.59 emu/g for Fe/ZnO, during milling time. Coated steel plate by Fe/ZnO and Fe/Al 2 O 3 nanocomposite milled until 20 h by a thermal spray process.). The objectif of this work is to studied the effect of milling time and the addition of different oxide element on the metal matrix for the nanocomposite powder, and then studied the effect of the thermal spraying process on the strucural, mechanical and magnetic properties of the nanocomposite coating. After thermal spraying, many different phases were appeared in Fe/Al 2 O 3 coating, such as Al 2 O 3 , Fe 2 O 3 and Al 2 FeO 4 and ZnFe2O4, NiFe2O4 and FeNi on Fe/ZnO coating. The change in the chemical composition of coating was influenced on the magnetic behavior and structural properties, the maximum saturation magnetization was found in Fe 60 (ZnO) 40 sprayed powder, however, the maximum coercivity was found in Fe 60 (Al 2 O 3 ) 40 sprayed powder.