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1173 |
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Cold spraying technique to process nanomagnetic coatings
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Noureddine Fenineche / LERMPS - UTBM, France Mohamed Cherigui / Lermps, France Wen-Ya Li/ Lermps, France V. Ji/ ICMMO, France Christian Coddet/ Lermps, France |
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The cold gas dynamic spraying process, or cold spray (CS), represents a radical departure from conventional thermal spray (TS) methods in that the deposition process relies purely on kinetic energy rather than on a combination of thermal and kinetic components [1-3]. A potential advantage of this process over TS is the ability to generate dense coatings retaining initial material chemistry and phase composition with a very little oxidation. Also, low temperature process (no bulk particle melting) eliminates solidification stresses and enables thicker coatings [4]. However, hard brittle materials like ceramics can not be sprayed without using ductile binders. In this study, magnetic alloys such FeSiBNbCu also called Finemet and FeSiBNbCu-Al with various percentages of Aluminum coatings were synthesized using cold spray technique in order to produce ferromagnetic materials. Ultra-fine grain coatings were obtained using FINEMET nanostructured powders mixed with Aluminum as ductile binder in order to to improve adherence. Magnetic measurements revealed a soft magnetic character for all the powders and the coatings. 25% of Al was considered as ideal to produce an homogenous coating with suitable magnetic properties. Keywords: Nanomaterials, Cold spray, FINEMET, Magnetic properties, Microstructure. [1] Alkhimov AP, Kosarev VF, Papyrin AN. Sov Phys Dokl. 35 (1990), 1047. [2] Sampath S, Jiang XY, Matejicek J, Prchlik L, Kulkarni A, Vaidya A. Mat Sci Eng A- Struct. 364 (2004), 216. [3] McCune RC, Papyrin AN, Hall JN, Riggs LW, Zajchowski PH, Berndt CC, Sampath S, editors. Thermal spray science and technology. Materials Park (OH): ASM International; 1995. [4] H.J.Kim, C.H.Lee, S.Y. Hwang, Surf. Coat. Technol, 191 (2005)335. |