Spinel ferrites nanoparticles for alloy steel protective layers

Abstract

Covering layers might have very important role in improving performance of many mechanical parts. These layers are usually designed to protect a substrate from the environment and enhance mechanical properties such as hardness. Blackening is a classical approach that is very demanding on resources. This process is based on the alkalisation of surface atoms and the transformation of formed hydroxides to oxides. Such an approach inspired us to carry out experiments resulting in preparation of protective layers with similar properties, by using stoichiometric spinel ferrite nanoparticles (MeFe2O4). Thus mechanical parts were covered with ferrite nanoparticles and heated in a furnace. Ferrite samples, which were used as precursor for the preparation of layers, were analysed with X-ray powder diffraction, energy dispersive X-ray spectroscopy and 57 Fe Mössbauer spectroscopy. The samples were analysed with ultrasonic hardness test, electron microscopy, and Mössbauer spectroscopy. The protection layers showed a higher hardness compared to untreated parts.

Zinc Ferrite Nanoparticle Coatings on Austenitic Alloy Steel

“…Among different samples suitable for these experiments, only the most simple procedure was chosen to prove the viability of the layer fabrication. In another study, we showed that zinc ferrite deposited on CL20ES plates can provide increased hardness by 9 % [32]. In this study, we further investigate the possibilities of enhancing the properties of CL20ES austenitic alloy steel powder with a zinc ferrite (ZnFe 2 O 4 ) surface layer towards higher hardness and higher chemical stability.…”

Microwave-Enhanced Crystalline Properties of Zinc Ferrite Nanoparticles

“…Additionally, the tuning of the inversion factor can enhance the catalytic performance even more [ 1 , 7 ]. Due to the hardness of iron oxides and chemical stability of ferrites, another possible application is surface coatings for the protection of steel [ 17 , 18 ].…”