2016-Sustainable Industrial Processing Summit
SIPS 2016 Volume 9: Molten Salts and Ionic Liquids, Energy Production

Editors:Kongoli F, Gaune-Escard M, Turna T, Mauntz M, Dodds H.L.
Publisher:Flogen Star OUTREACH
Publication Year:2016
Pages:390 pages
ISSN:2291-1227 (Metals and Materials Processing in a Clean Environment Series)
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    Heat-Resistant CrSi2: Synthesis of Nanocrystalline Powders, Single Crystals, and Coatings from Molten Salts

    Liliia Molotovska1; Dmytro Shakhnin1; Viktor Malyshev2; Alla Sushchenko1; Marcelle Gaune-Escard3;
    Type of Paper: Regular
    Id Paper: 205
    Topic: 13


    The purpose of this work was the synthesis of heat resistant chromium disilicide nanocrystalline powders, single crystals, and coatings.<br />CrSi2 as the nanocrystalline powder was synthesized by co-reducing of anhydrous CrCl3 and Na2SiF6 with Na.<br />Single crystals were obtained by solution growth method with molten Sn-Zn (in weight ratio 1:10) as a flux. Cr and Si powder 99.9% purity in an atomic ratio 1:2 were added to Sn-Zn melt in weight ratio 1:10.<br />CrSi2 coatings were obtained by currentless deposition of Si onto pure chromium substrate in the molten KCl-NaCl-NaF-Na2SiF6-Si system.<br />TGA and DSC results show that the highest oxidation resistance in the air has nanocrystalline CrSi2 powders (800 ºC). Single crystals and coatings were resistant up to 700 ºC. A slight increase of samples weight (from 4,6% to 6,8%) was found. Subsequently, the protective oxide layer of SiO2 was formed on samples surface. Obtained values of temperature resistance for nanocrystalline powders, single crystals, and coatings were different. It can be related to size and morphology of synthesized samples, and also with the method of product obtaining. Due to high oxidation resistance, obtained samples could be used as heat resistant details and coating for devices working at elevated temperatures.<br />Keywords: chromium disilicide, X-ray diffraction, differential thermogravimetric analysis, oxidation resistance.


    Molten Salt Chemistry and Thermodynamics;


    [1] K. N. Mason: Growth and characterization of transition metal silicides, Prog. Cryst. Growth Charact., 2 (1981), 269-307.
    [2] J. Lu, H. Yang, B. Liu, J. Han, and G. Zou: Preparation and physical properties of nanosized semiconducting CrSi2 powders, Mater. Chem. Phys., 59 (1999), 101-106.
    [3] I. Nishida: The crystal growth and thermoelectric properties of chromium disilicide, J. Mater. Sci., 7 (1972), 1119-1124.
    [4] W. Henrion, H. Lange, E. Jahne, and M. Giehler: Optical properties of chromium and iron disilicide layers, Appl. Surf. Sci., 70/71 (1993), 569-572.
    [5] F.M. Courtel, D. Duguay, Y. Abu-Lebden, I.J. Davidson: Investigation of CrSi2 and MoSi2 as anode materials for lithium-ion batteries, J. Power Sources., 202 (2012), 269-275.
    [6] K. Seo, K. S. K. Varadwaj, D. Cha, J. In, J. Kim, J. Park, and B. Kim: Synthesis and Electrical Properties of Single Crystalline CrSi2 Nanowires, J. Phys. Chem., 111 (2007), 9072-9076.
    [7] G.V. Samsonov, L.A. Dvorina, and B.M. Rud, Silicidy [Silicides], 1979, Moscow: Metallurgia [in Russian].
    [8] S. P. Murarka: Silicide thin films and their applications in microelectronics, Intermetallics, 3 (1995), 173-186.
    [9] J. Ma, Y. Gu, and L. Shi: Synthesis and thermal stability of nanocrystalline chromium disilicide, J. Alloys Comp., 376 (2004), 176-179.
    [10] L. A. Molotovska, D. B. Shakhnin, and V. V. Malyshev: Metallothermic Reduction and Direct Synthesis Techniques in Production of Chromium Disilicide, Powder Metallurgy and Metal Ceramics, 53 (2014), 386-391.
    [11] X. Su, Y. Liu, D. Y. H. Liu, J.-C. Tedenac, F. Yin, and J. Wang: Experimental investigation and thermodynamic assessment of the Zn–Cr system, J. Alloys Comp., 496 (2010), 159-163.
    [12] N. G. Ilyuhshchenko, A. I. Afinogenov, and N. I. Shurov, Vzaimodejstvie metallov v ionnyh rasplavah [Interaction of metals in ionic melts], 1991, Moscow: Nauka [in Russian].
    [13] K. Tatemoto, Y. Ono, and R. O. Suzuki: Silicide coating on refractory metals in molten salt, J. Phys. Chem. Solids, 66 (2005), 526-529.
    [14] T. Feng, H.-J. Li, Q.-G. Fu, X. Yang, and H. Wu: The oxidation behavior and mechanical properties of MoSi2–CrSi2–SiC–Si coated carbon/carbon composites in high-temperature oxidizing atmosphere, Corrosion Science, 53 (2011), 4102-4108.

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    Molotovska L, Shakhnin D, Malyshev V, Sushchenko A, Gaune-Escard M. Heat-Resistant CrSi2: Synthesis of Nanocrystalline Powders, Single Crystals, and Coatings from Molten Salts. In: Kongoli F, Gaune-Escard M, Turna T, Mauntz M, Dodds H.L., editors. Sustainable Industrial Processing Summit SIPS 2016 Volume 9: Molten Salts and Ionic Liquids, Energy Production. Volume 9. Montreal(Canada): FLOGEN Star Outreach. 2016. p. 151-156.