METALLURGICAL TWO-STEP PRODUCING METHOD OF FE NANOPARTICLES

Submitted paper is dealt with preparation of iron based nanoparticles and marginally also cobalt nanoparticles through precipitation from solid solution of age-hardenable alloys and their subsequent insulation by electrochemical or chemical resolution of matrix. The simpliest system is Cu-matrix in...

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Published inAnnals of Faculty Engineering Hunedoara Vol. 9; no. 1; p. 183
Main Authors Nizník, Stefan, Milkovic, Ondrej, Longauer, Svätoboj
Format Journal Article
LanguageEnglish
Published Hunedoara Faculty of Engineering Hunedoara 01.01.2011
Subjects
Annealing
Aqueous solutions
Corrosion potential
Magnetic fields
Metallurgy
Solid solutions
Statistical methods
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Summary:Submitted paper is dealt with preparation of iron based nanoparticles and marginally also cobalt nanoparticles through precipitation from solid solution of age-hardenable alloys and their subsequent insulation by electrochemical or chemical resolution of matrix. The simpliest system is Cu-matrix in which Fe resp. Co as elements are precipitated in form of coherent particles γ-Fe,Co. These particles are changed at plastic deformation or at extraction and insulation by martensitic transformation on α-Fe, Co. For purposes of nanoparticles precipitation from solid solution there is performed the targeted heat treatment consisting of solution annealing, quenching and precipitation annealing. The size of nanoparticles is regulated by heat treatment of chosen material according to the required procedure. The volume of separated nanoparticles is proportional to the time of dissolution and to the potentiostatic mode according to applied potential-dynamic curves. The quality and material characteristics of nanoparticles was controlled by the methods of TEM, x - ray analysis and measurement of magnetic properties. [PUBLICATION ABSTRACT]
ISSN:1584-2665
2601-2332