ИСТИНА

Finely dispersed particles of soft magnetic Fe-Si-Al alloys are widely used as fillers of magnetodielectric composites for high-frequency applications due to their unique properties [1-3]. Surface modification of metallic particles under wet ball milling in various organic media, including in the presence of surfactants [4], and in media whose composition is close to the composition of the dielectric polymer matrix is of great interest. Such milling results in the creation on the particles of thin surface layers, which play the role of an interface layer improving the adhesion of metallic particles to the polymer matrix and protect them from corrosion. Fe75Si15Al10 alloy was produced by ball milling of the elemental powder mixture in an argon atmosphere. Surface modification was carried out under wet ball milling in organosilicon block copolymer ("Lestosil SM") and surfactants (stearic and phenylanthranilic acids, sodium dodecyl sulfate) solutions, which are effective inhibitors of corrosion at the same time. The produced materials were characterized by scanning electron microscopy, X-ray diffraction analysis and Mossbauer spectroscopy. The interaction of modifying agents with particles surface was evaluated by investigation of the surface layers of the particles after surface modification by X-ray photoelectron and IR spectroscopies. The corrosion behavior of the powders in aqueous solutions of 3 wt. % NaCl and 0.1 m. HCl was also investigated. This study was performed within the scope of the state task of the Federal Agency for Scientific Organizations (no. АААА-А17-117022250038-7) and was supported by the Program of UD RAS (project no. 18-10-2-21). [1] K. Sakai, Y. Wada, S. Yoshikado, PIERS Online 4 (2008) 846-853. [2] M. Han, D. Liang, K.N. Rozanov, L. Deng, IEEE Trans Magn 49 (2013) 982-985. [3] L. Qiao, X. Li, T. Wang, L. Tang, F. Li, J Magn Magn Mater 393 (2015) 347–351. [4] A.V. Syugaev, A.N. Maratkanova, A.A. Shakov, A.V. Nelyubov, S. F. Lomayeva, J Surf Coat Technol 236 (2013) 429-437.