The study on surface chemical modification of Fe71.5Cu1Nb3Si13.5B9V2 amorphous alloy ribbons and its piezomagnetic effect

In this paper, a type of smooth even endogeny conversion coat composed of Cu0.86Fe2.14O4 and (Cu0.18Fe0.82)Cu0.82Fe1.18O4 phases was successfully obtained by a conversion reaction on the surfaces of Fe71.5Cu1Nb3Si13.5B9V2 amorphous alloy ribbons. In this way, its ribbon thickness was decreased about 6-8 mu m equivalently. The phase composition and microstructure of the conversion coat were investigated by XRD and SEM. In addition, the adhesion test of epoxy resin and amorphous alloy ribbon was verified by dipping experiments. It is found that the interface bonding strength between the conversion coat and ribbons is strong comparatively. On one hand, the proper interface between conversion coat and epoxy resin make it easy for ribbons to be encapsulated; on the other hand, the ribbons perform better significant piezomagnetic effect than the untreated ones due to a thinner thickness. This work may be a good basic for the applications of Fe71.5Cu1Nb3Si13.5B9V2 amorphous alloy ribbons in piezomagnetic sensor and other devices based on the piezomagnetism effect. (C) 2016 Published by Elsevier B.V.