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1 Archives of Materials Science and Engineering

1 2011

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Magnetic properties of magnetostrictive Tb0.3Dy0.7Fe1.9 / polyurethane composite materials

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Dobrzański L. , Tomiczek A. , Nabiałek A. , Stokłosa Z.

2011

tom Vol. 51, nr 2

97-102

Purpose: The aim of this work was to obtain polyurethane matrix composite materials reinforced with Tb0.3Dy0.7Fe1.9 particles and to observe changes of magnetic properties and magnetostriction of samples with different particle size distributions of Tb0.3Dy0.7Fe1.9 powder and varying volume concentration. Design/methodology/approach: The studies was performed on composite materials with the polyurethane matrix reinforced with Tb0.3Dy0.7Fe1.9 powders. The morphology of powder was examined by scanning electron microscopy (SEM) and analysis of the grain distribution of Tb0.3Dy0.7Fe1.9 powder was made using the Mastersizer 2000 analyser. The changes of magnetostriction and magnetic properties, including hystersis loops and effective permeability with changing applied field are tested. Findings: Analysis establishes a direct connection between magnetic properties and structural characteristics of the Tb0.3Dy0.7Fe1.9 powder size, which was used as reinforcement phase. The increase of particle size distribution of Tb0.3Dy0.7Fe1.9 powder in composite materials amplify the magnetostrictive responses, moreover the change of magnetic properties as a function of volume fraction of Tb0.3Dy0.7Fe1.9 powder were confirmed. Research limitations/implications: Contributes to research on structure and properties of magnetostrictive composite materials with the polymer matrix reinforced with Tb0.3Dy0.7Fe1.9 powders. Practical implications: The polymer matrix in investigated composite materials causes growth of resistivity, limiting this way losses for eddy currents at the high operating frequency of the transducers. In addition the values of permeability of composite materials is nearly constant in investigated frequency range. Originality/value: The obtained results show the possibility of manufacturing the magnetostrictive composite materials based on the Tb0.3Dy0.7Fe1.9 particles, with desired properties in cost effective way in comparison to conventional giant magnetostrictive materials (GMM).