Magnetostrictive Properties of Epoxy-Bonded Tb_0,3Dy_0,7Fe_1,9 Composites

Abstract

Tb0,3Dy0,7Fe1,9 composites attract much attention due to their large magnetostriction, and small eddy current losses. In this work intelligent polymer matrix composite materials consisting of Tb0,3Dy0,7Fe1,9 particles was obtained by mixing epoxy resin and Tb0,3Dy0,7Fe1,9 powder with grains from 38 to 106 μm. The relationships among the manufacturing technology of these materials, their microstructure, as well as their magnetostriction were evaluated. Resulting composites can extend the possibilities of application the magnetostrictive materials simultaneously reduce the cost of Tb0,3Dy0,7Fe1,9.

Variation of magneto‐mechanical properties in giant magnetostrictive composite materials

“…unfilled points on the boundary between particles and matrix). The characteristics are related to the method of producing composite materials and properties of the material representing the matrix . As a result of the low viscosity of the polyurethane resin used as the matrix for the composite materials developed the Terfenol‐D particles are well wetted (which is the evidence of good polar adhesion) and there are no non‐continuous links between those two phases.…”

“…Simultaneously, the share of the binding materials should provide the composite material with the desired mechanical and physical properties with the minimized effect on its usable properties. In the case of magnetostrictive composite materials, their resultant properties are decided not only by their components' characteristics and their volume fraction but also by the way of reinforcement, that is, matrix binding . Moreover—from the practical point of view—it is essential to achieve the largest deformation with the minimum magnetic field strength, in order to provide the most effective energy transformation.…”

Magnetomechanical Properties Of Composite Materials With Giant Magnetostriction

“…The advantages of magnetostrictive particle dispersion into the polymer matrix include -among others -a wider transducer frequency band, lower brittleness, the possibility of adjusting the properties for specific application and the competitive price of the composite materials in comparison to monolithic Tb 0.3 Dy 0.7 Fe 1.9 [9][10][11]. Proper selection of the matrix material affects the characteristics of the composite materials: it has been established that the properties of these materials are highly dependent on the matrix properties, the volume fraction of the reinforcing particles and their distribution [12][13][14].…”

“…In [15] an opinion has been presented that the Tb 0.3 Dy 0.7 Fe 1.9 powder parameters (particle size and shape) have inconsiderable influence on the static and dynamic properties of the composite material. Further research has proven this state and since then study has focused mostly on obtaining the maximum magnetostriction in the function of the composite material components: the size [10,[15][16][17] and shape [17][18][19][20] of the magnetostrictive particles, as well as the matrix properties [9,10,17,18,21,22].…”