Oxidation resistance coatings of Mo−Si−B alloys via a pack cementation process
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Oxidation behavior of Si pack cementation coatings on a three-phase Mo−Si−B alloy was examined. During Si pack cementation of a three-phase Mo−Si−B alloy, a MoSi2 outer layer was synthesized on the exterior layer. Following oxidation in air of the pack-coated alloys at 1200°C, the MoSi2 phase layer was consumed and replaced by the Mo5Si3 (or T1) phase. The synthesized T1 phase provided excellent oxidation resistance when exposed to high temperatures. The silicide-coated alloys exhibit higher oxidation resistance compared with uncoated Mo−Si−B alloys. The enhanced oxidation behavior and its mechanism are discussed in terms of the thicknesses of the oxide layers under exposure to high temperatures.
Key wordspack cementation oxidation resistance Mo−Si−B alloy
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- 8.J. H. Perepezko, R. Sakidja, S. Kim, Z. Dong, and J. S. Park, Structural Intermetallics 2001 (ed. K. J. Hemker), p. 505–514, TMS, Pennsylvania (2001).Google Scholar
- 9.N. P. Bansal, R. H. Doremus, (eds.) Handbook of Glass Properties, Academic Press, Orlando (1986).Google Scholar
- 10.S. R. Levine and R. Am Caves, J. Electrochem. Soc.: Solid-State Sci. Tech. 121, 1051 (1974).Google Scholar
- 12.P. R. Gage and R. W. Bartlett, Trans. Metall. Soc. AIME 233, 832 (1965).Google Scholar
- 16.D. M. Berczik, US Patent No. 5, 595, 616/No. 5, 693, 156 (1997).Google Scholar