New possibilities of composite materials application - Materials of specific magnetic properties

This paper presents the material and technological solution which makes it possible obtaining of soft and hard magnetic composite materials: nanocrystalline material-polymer. For fabrication of composite materials the following powders were used: soft magnetic material (Fe73.5Cu1Nb3Si13.5B9) and hard magnetic material (Nd14.8Fe76CO4.95B4.25)- Polymer was used as the matrix (2.5wt.%). Advanced composite materials were compacted by the one-sided uniaxial pressing. The complex relationships among the manufacturing technology of these materials, their microstructure, as well as their mechanical and physical properties were evaluated. Materialographic examination of powders morphology and the structure of composite materials were made. Composite materials show regular distribution of magnetic powder in polymer matrix. Examination OF of mechanical properties shows that these materials have satisfactory compression strength. Composite materials show lower magnetic properties in comparison with magnetic powder but their geometrical form allows extending their applications. The paper shows also the possibilities of these magnetic materials application. The advantage of the bonded composite materials is their simple technology, possibility of forming their properties, lowering manufacturing costs because of no costly finishing and lowering of material losses resulting from the possibility of forming any shape. The manufacturing of composite materials greatly expand the applicable possibilities of nanocrystalline powders of magnetically hard and soft materials. (C) 2007 Elsevier B.V. All rights reserved.