期刊
CERAMICS INTERNATIONAL
卷 40, 期 5, 页码 6541-6552出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2013.11.107
关键词
Self-propagating high-temperature synthesis (SHS); Reaction diffusion; MoB; MoSi2
资金
- Program on Creation and Development of the National University of Science and Technology (MISIS)
- Analytical Departmental Target Program Development of the Research Potential of the Higher School
- Federal Target Program Research and Developments on Priority Development Areas of Scientific-Technological Complex of Russia [14.513.11.0051]
The goal of this work is to investigate the combustion mechanisms of reactions in the Mo-Si-B system and to obtain ceramic materials using the SETS method. It is concluded that the following processes are defined by the SHS for Si-rich Mo-Si-B compositions: silicon melting, its spreading over the surfaces of the solid Mo and B particles, followed by B dissolution in the melt, and formation of intermediate Mo3Si-phase film. The subsequent diffusion of silicon into molybdenum results in the formation of MoSi2 grains and molybdenum boride phase forms due to the diffusion of molybdenum into B-rich melt. The formation of MoB phase for B-rich compositions may occur via gas-phase mass transfer of MoO3 gaseous species to boron particles. The stages of chemical interaction in the combustion wave are also investigated. The obtained results indicate the possibility of both parallel and consecutive reactions to form molybdenum silicide and molybdenum boride phases. Thus the progression of combustion process may occur through the merging reaction fronts regime and splitting reaction fronts regime. Molybdenum silicide formation leads the combustion wave propagation during the splitting regime, while the molybdenum boride phase appears later. Finally, targets for magnetron sputtering of promising multi-phase Mo Si B coatings are synthesised by forced SHS compaction method. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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