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Mechanically Activated Combustion Synthesis of Molybdenum Silicides and Borosilicides

Published online by Cambridge University Press:  02 January 2015

Mohammad S. Alam ,
Alan A. Esparza  and
Evgeny Shafirovich
Mohammad S. Alam
Affiliation:
Department of Mechanical Engineering, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA
Alan A. Esparza
Affiliation:
Department of Mechanical Engineering, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA
Evgeny Shafirovich
Affiliation:
Department of Mechanical Engineering, The University of Texas at El Paso, 500 W. University Ave., El Paso, TX 79968, USA
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Abstract

Molybdenum silicides and borosilicides are promising structural materials for advanced power plants. A major challenge, however, is to simultaneously achieve high oxidation resistance and acceptable mechanical properties at high temperatures. For example, molybdenum disilicide (MoSi2) has excellent oxidation resistance and poor mechanical properties, while Mo-rich silicides such as Mo5Si3 (called T1) have much better mechanical properties but poor oxidation resistance. One approach is based on the fabrication of MoSi2−T1 composites that combine high oxidation resistance of MoSi2 and good mechanical properties of T1. Another approach involves the addition of boron to Mo-rich silicides for improving their oxidation resistance through the formation of a borosilicate surface layer. In particular, Mo5SiB2 (called T2) phase and alloys based on this phase are promising materials.

In the present paper, MoSi2−T1 composites and materials based on T2 phase are obtained by mechanically activated self-propagating high-temperature synthesis (MASHS). To obtain denser products, the so-called SHS compaction (quasi-isostatic pressing of hot combustion products) has been employed. Thermal analysis has shown that SHS compaction significantly improves the oxidation resistance. Self-sustained combustion of Mo/Si/B mixtures for the formation of T2 phase becomes possible if the composition is designed for adding a more exothermic reaction of MoB formation. These mixtures exhibit spin combustion. Oxidation resistance of the obtained multi-phase Mo−Si−B materials is independent on the concentration of Mo phase in the products. The “chemical oven” technique has been used to obtain a single Mo5SiB2 phase and an alloy consisting of α-Mo, Mo5SiB2, and Mo3Si phases.

Keywords

combustion synthesis (SHS)mechanical alloyingMo
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1760: Symposium YY – Advanced Structural and Functional Intermetallic-Based Alloys , 2015 , mrsf14-1760-yy03-02
Copyright
Copyright © Materials Research Society 2014 

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References

REFERENCES

Perepezko, J.H., Science 326 (11), 1068–1069 (2009).CrossRefGoogle ScholarPubMed
Dimiduk, D.M. and Perepezko, J.H., MRS Bull. 28 (9), 639−645 (2003).CrossRefGoogle Scholar
Perepezko, J.H., Sakidja, R., and Kumar, K.S., in Advanced Structural Materials: Properties, Design Optimization, and Applications, edited by Soboyejo, W. (CRC Press, Boca Raton, FL, 2007), p. 437.Google Scholar
Lember, J.A. and Ritchie, R.O., Adv. Mater. 24 (26), 3445–3480 (2012).CrossRefGoogle Scholar
Mitra, R., Int. Mater. Rev. 51 (1), 13−60 (2006).CrossRefGoogle Scholar
Akinc, M., Meyer, M.K., Kramer, M.J., Thom, A.J., Huebsch, J.J., and Cook, B., Mat. Sci Eng. A 261, 16–23 (1999).CrossRefGoogle Scholar
Yamauchi, A., Yoshimi, K., Kurokawa, K., and Hanada, S., J. Alloys Comp. 434–435, 420–423 (2007).CrossRefGoogle Scholar
Jehanno, P., Heilmaier, M., Saage, H., Boning, M., Kestler, H., Freudenberger, J., and Drawin, S., Mat. Sci Eng. A 463, 216–223 (2007).CrossRefGoogle Scholar
Kruger, M., Franz, S., Saage, H., Heilmaier, M., Schneibel, J.H., Jehanno, P., Boning, M., and Kestler, H., Intermet. 16, 933–941 (2008).CrossRefGoogle Scholar
Gras, C., Vrel, D., and Gaffet, E., Bernard, F., J. Alloy Compd. 314 (1–2), 240–250 (2001).CrossRefGoogle Scholar
Gras, C., and Gaffet, E., Bernard, F., Intermetallics 14 (5), 521–529 (2006).CrossRefGoogle Scholar
Morsi, K., J. Mater. Sci. 47 (1, 68–92 (2011).CrossRefGoogle Scholar
Yukhvid, V.I., Pure Appl. Chem. 64, 977–988 (1992).CrossRefGoogle Scholar
Olevsky, E.A., Strutt, E.R., and Meyers, M.A., J. Mater. Process. Technol. 121, 157–166 (2002).CrossRefGoogle Scholar
Amosov, A.P., Radchenko, V.P., Fedotov, A.F., and Ermolenko, M.A., Powder Metall. Met. C+ 43, 229–235 (2004).CrossRefGoogle Scholar
Delgado, A. and Shafirovich, E., Combust. Flame 160 (9), 1876–1882 (2013).CrossRefGoogle Scholar
Merzhanov, A.G., Filonenko, A.K., and Borovinskaya, I.P., Sov. Phys. Dokl. 208, 122–125 (1973).Google Scholar
Maksimov, Y.M., Pak, A.T., Lavrenchuk, G.B., Naiborodenko, Y.S., and Merzhanov, A.G., Combust. Explo. Shock Waves 15 (4), 415–418 (1979).CrossRefGoogle Scholar
Maksimov, Y.M., Merzhanov, A.G., Pak, A.T., and Kuchkin, M.N., Combust. Explo. Shock Waves 17 (4), 393–400 (1981).CrossRefGoogle Scholar
Schneibel, J.H., Intermetallics 11, 615−632 (2003).CrossRefGoogle Scholar
Perepezko, J.H. and Sakidja, R., Oxid. Met. 80, 207−218 (2013).CrossRefGoogle Scholar