Oxidation Behaviours of MoSi2 Single Crystal at the Temperatures of 773K and 1473K


Article Preview

MoSi2 is a potential high temperature structural materials and shows excellent oxidation resistance at high temperatures. To explore its oxidation behaviour and mechanism, MoSi2 single crystals were prepared and investigated in the present work. The experimental results showed that different from its polycrystalline, MoSi2 single crystal showed good oxidation resistance at both 773 and 1473K. Near parabolic law of oxidation kinetics was followed for all the investigated surfaces of MoSi2 single crystal. The close-packed (110) surface of MoSi2 single crystal showed the best oxidation resistance at both temperatures. After exposure at 773K, the molybdenum oxide formed on the (110) surface of MoSi2 single crystal was found to be Mo4O11 instead of MoO3 formed on the other surfaces. Morphology observation showed a columnar growth of Mo4O11 on the (110) surface. No difference was found on the oxide formed for different surfaces of MoSi2 single crystal at 1473K.



Materials Science Forum (Volumes 561-565)

Main Theme:

Edited by:

Young Won Chang, Nack J. Kim and Chong Soo Lee




L. T. Zhang et al., "Oxidation Behaviours of MoSi2 Single Crystal at the Temperatures of 773K and 1473K", Materials Science Forum, Vols. 561-565, pp. 453-457, 2007

Online since:

October 2007




[1] Mitra R, Rama Rao V V. Effect of minor alloying with Al on oxidation behaviour of MoSi2 at 1200o C. Materials Science and Engineering, 1999, A260: 146-160.

DOI: https://doi.org/10.1016/s0921-5093(98)00972-1

[2] Kuchino J, Kurokawa K, Shibayama T, Takahashi H. Effect of microstructure on oxidation resistance of MoSi2 fabricated by spark plasma sintering. 2004, 73: 623-628.

DOI: https://doi.org/10.1016/j.vacuum.2003.12.081

[3] Kircher T A, Courtright E L. Material Science and Engineering, 1992, A155: 67.

[4] Nakano T, Azuma M, Umakoshi Y. Tensile deformation and fracture behavior in NbSi2 and MoSi2 single crystals. Acta Materialia, 2002, 50: 3731-3742.

DOI: https://doi.org/10.1016/s1359-6454(02)00185-4

[5] Vasudévan A K, Petrovic J J. A comparative overview of molybdenum disilicides composites. Materials Science and Engineering, 1992, A155: 1-17.

[6] Umakoshi Y, Sakagami T, Hirano T, Yamane T. High temperature deformation of MoSi2 single crystals with the C11b structure. Acta Metall. Mater., 1990, 38: 909-915.

DOI: https://doi.org/10.1016/0956-7151(90)90163-b

[7] Inui H, Ishikawa K, Yamaguchi M. Creep deformation of single crystals of binary and some ternary MoSi2 with C11b structure. Intermetallics, 2000, 8: 1159-1168.

DOI: https://doi.org/10.1016/s0966-9795(00)00055-8

[8] Fang Zhang, Lanting Zhang, Aidang Shan, Jiansheng Wu. In-situ observations of the pest oxidation process of NbSi2 at 1023K. Scripta Materialia, 2005, 53: 653-656.

DOI: https://doi.org/10.1016/j.scriptamat.2005.05.023

[9] F H Yuan, E H Han, C Y Jo, T F Li and Z Q Hu, Oxidation of Metals, 60(3-4): 211-224 OCT (2003).

[10] Fen H K, Yang p, Sasaki M, Inoue M, Kadomatsu H. Rietveld refinement of the crystal structure of γ-Mo4O11. Powder diffraction, 1999, 14: 284-288.

DOI: https://doi.org/10.1017/s0885715600010691

[11] Lee KH, Yoon JK, Kim GH, Doh JM, Hong KT, Yoon WY. J Mater Res 2004; 19(10): 3009.