Low eddy current loss of Terfenol-D/epoxy particulate magnetostrictive composites prepared using the particle phosphatizing treatment method

In this paper, Terfenol-D/epoxy particulate composites with low eddy current loss are prepared using the particle phosphatizing treatment method. A compound phosphate coating of Tb, Dy and Fe is present on the Terfenol-D particle surface after phosphatizing treatment, identified by surface morphology, composition and chemical status analyses. As a result, the DC resistivities increase by 2–3 orders of magnitude, and the interparticle eddy current loss of the particle phosphatized composites significantly decreases. Moreover, the magnetostriction of the particle phosphatized composites remains at the same level as those of the uncoated state. This research provides an approach to preparing Terfenol-D/epoxy magnetostrictive composites with low eddy current loss for high-frequency applications.