Abstract
Ferrite coating of acid treated iron particles with have been optimized using electroless process. The effect of the functionalization was monitored by XPS and SEM analysis whereas adhesion behavior of ferrite thin films was characterized using a non-conventional ultrasonic test. It is shown that acidic treatments increase the amount of hydroxyl groups on the surface of iron particles, allowing the creation of chemical bonds between the iron core and its ferrite shell. It leads to an increase of the adhesion between both materials. It is shown that the reactivity of iron particles improves the ferrite deposition process. A homogeneous adhesive ferrite coating of around 2 μm with a deposition process of 90 min has been obtained.
Highlights
With the growth of miniaturization requirement for application such as transformers, computers, and inductors or motors, soft magnetic composites (SMC) with high flux density, high permeability and low magnetic loss are under development [1-5]
The aim of this study was to control the chemistry of the Fe particle surface by using a chemical treatment and to measure, after the grow of NiZn thin films onto Fe, the interfacial strength between the Fe particles and the NiZn ferrite coating
Ni-Zn ferrite insulating layer have been grown onto iron particles using electroless process
Summary
With the growth of miniaturization requirement for application such as transformers, computers, and inductors or motors, soft magnetic composites (SMC) with high flux density, high permeability and low magnetic loss are under development [1-5] These powders are composed of an iron (or its alloys) core coated with a thin electrically insulating layer. Abe have developed a process to deposit NiZn ferrite onto particles by an aqueous route using metal salt [11]. They reported that 1) the ferrite coating occurs thanks to the presence of hydroxyl groups (-OH) on the surface of the substrate and 2) the increase of the –OH group concentration on the surface of particles, after acid treatment, leads to an increase of the substrate reactivity. The morphology and the adhesion strength of the NiZn ferrite coating, electroless deposited onto acid treated Fe particles, have been analyzed and correlated with the experimental procedures
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