Oxidation resistance coatings of Mo−Si−B alloys via a pack cementation process |
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| Authors: | J S Park J M Kim H Y Kim S Yi J H Perepezko |
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| Affiliation: | (1) Advanced Materials Engineering, Hanbat National University, San 16-1, Deokmyeong-dong, Yuseong-gu, 305-719 Daejeon, Korea;(2) Materials Science and Metallurgical Engineering, Kyungpook National University, 1370, Sangyeock-dong, Buk-gu, 702-701 Daegu, Korea;(3) Materials Science & Engineering, University of Wisconsin-Madison, 53706 Madison, WI, USA |
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| Abstract: | 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. |
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| Keywords: | pack cementation oxidation resistance Mo− Si− B alloy |
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