Heterogeneous Metal Oxide Coatings with Magnetoactive Nickel, Cobalt, and Iron Phases Formed by the Method of Pulsed Mic
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HETEROGENEOUS METAL OXIDE COATINGS WITH MAGNETOACTIVE NICKEL, COBALT, AND IRON PHASES FORMED BY THE METHOD OF PULSED MICROPLASMA OXIDATION FOR RADIATION ABSORPTION IN THE MIDDLE AND NEAR-IR REGIONS A. I. Mamaev, Yu. N. Dolgova, A. A. Yeltsov, G. V. Plekhanov, A. E. Ryabikov, T. A. Baranova, and V. A. Mamaeva
UDC 544.653
Heterogeneous coatings with high ability to absorb electromagnetic radiation in the middle (4000–400 cm–1) and near-IR regions (11000–2000 cm–1) are formed by the method of pulsed microplasma oxidation on aluminum and titanium alloys in inorganic electrolytes containing nickel, cobalt, and iron compounds. The electromagnetic radiation absorption is provided not only by the oxide coating itself, but also mainly by the heterogeneous metal particles of nickel, cobalt, and iron forming a dispersed metal phase and having magnetic properties that are incorporated into the coating pores by the method of microplasma oxidation under the action of a constant magnetic field. The influence of the electrolyte compositions and of the parameters of pulsed microplasma oxidation on the structure, composition, and radiation absorption properties of coatings is studied. It has been revealed that coatings formed in a phosphate-borate electrolyte with addition of nickel at a voltage of 300 V, a pulse duration of 100 μs, and a process duration of 5 min have the best absorption ability. Keywords: radiation absorbing coatings, pulsed microplasma oxidation, magnetoactive phases, absorption in the middle and near-IR regions, heterogeneous metal-oxide coatings.
INTRODUCTION The development of the method of designing inorganic coatings which not only reliably protect the surface of the metal base from adverse physical service conditions, but also effectively absorb electromagnetic radiation, is one of the urgent problems of science. The present work is aimed at the development of the method for obtaining oxide metalcontaining aluminum and titanium alloys absorbing electromagnetic radiation in the middle (4000–400 cm–1) and nearIR regions (11000–2000 cm–1) and the study of their ability to absorb electromagnetic radiation in these regions. The above-indicated goal cannot be reached by forming homogeneous coating structures; therefore, in this work a number of methods of forming heterogeneous structures containing magnetic particles in porous oxide structures are used. This suggests the application of a set of different layer design techniques, a choice of the method of coating formation, determination of the electrolyte composition, determination of the optimal electrochemical parameters of the process of coating formation, study of the elemental composition of the obtained radiation absorbing coatings, and study of their ability to absorb electromagnetic radiation in the middle and near-IR regions.
National Research Tomsk State University, Tomsk, Russia, e-mail: [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected]; [email protected].
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