Reaction synthesis of spark plasma sintered MoSi2-B4C coatings for oxidation protection of Nb alloy |
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| Authors: | Ping Zhang Chenglong Chen Zheng Chen Xuanru Ren Chengjin Shen Peizhong Feng |
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| Affiliation: | 1. School of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, PR China;2. The Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment, PR China |
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| Abstract: | MoSi2-B4C coatings with different B4C contents were prepared on Nb alloy by spark plasma sintering (SPS) process. Powder mixtures of Mo, Si and B4C were used as the coating starting materials. Besides MoSi2 and B4C phases, small amounts of SiC and MoB are also found in the coatings because of the reactions of Mo, Si and B4C powders during sintering. Compared with single MoSi2 coating, the MoSi2-B4C coatings show better oxidation resistance at 1450?℃, and dense B2O3-SiO2 oxide scales form after 100?h oxidation. The B4C or MoB in the MoSi2-B4C coatings can serve as the B donor for the formation of B2O3. A slight degradation in the microstructure of the MoSi2-B4C coatings after oxidation is observed, which can be attributed to the presence of an NbB layer in the inter-diffusion zone of the coatings that retards the inward diffusion of Si from the coating into the substrate alloy. The microstructure development and oxidation behavior of the MoSi2-B4C coatings have been discussed. |
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| Keywords: | Spark plasma sintering Nb alloy Oxidation resistance Diffusion behavior |
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