Features of Structural and Phase Transformations in Mo–Si–B and Сr–Al–Si–B Systems During Self-Propagating High-Temperature Synthesis

Authors

  • A. Yu. Potanin National University of Science and Technology “MISIS”, SHS Research & Education Center MISIS-ISMAN, Leninsky Prospect, 4, Moscow 119049, Russia
  • Yu. S. Pogozhev National University of Science and Technology “MISIS”, SHS Research & Education Center MISIS-ISMAN, Leninsky Prospect, 4, Moscow 119049, Russia
  • E. A. Levashov National University of Science and Technology “MISIS”, SHS Research & Education Center MISIS-ISMAN, Leninsky Prospect, 4, Moscow 119049, Russia
  • D. Yu. Kovalev Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, ul. Academica Osipyana, 8, Chernogolovka, Moscow Region 142432, Russia
  • A. V. Novikov National University of Science and Technology “MISIS”, SHS Research & Education Center MISIS-ISMAN, Leninsky Prospect, 4, Moscow 119049, Russia

DOI:

https://doi.org/10.18321/ectj169

Abstract

This study is dedicated to investigation of the combustion mechanisms during the SHS of ceramic
materials in multicomponent Mo–Si–B and Cr–Al–Si–B systems. It is concluded that the following
processes are defined the SHS for Si-rich Mo–Si–B compositions: Si 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 Si into Mo results in the formation of MoSi2 grains and MoB phase forms due to the diffusion of Mo 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 B particles and B2O2 to Mo particles. In
Cr–Al–Si–B system firstly, the Al–Si eutectic mixture undergoes contact melting followed by formation
of the reactionary surface as the eutectic melt spreads over the Cr and B particles surface. An increase in
Al content increases the proportion of the Al–Si eutectic melt. The dissolution of Cr particles in this melt
becomes the rate-limiting stage of the combustion process. The melt is saturated with these elements followed by crystallization of CrB and Cr(Si,Al)2 grains. In the Cr- and B-rich areas and low melt concentration, the formation of CrB may occur via gas-phase mass transfer of B2O2 gaseous species to Cr particles. Consecutive formation of chromium and molybdenum borides and silicides is established by means of dynamic X-ray diffraction analysis. Compact ceramic samples were produced using forced SHS pressing technique. Their structural investigations were conducted by XRD and SEM.

References

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Published

2014-01-20

How to Cite

Potanin, A. Y., Pogozhev, Y. S., Levashov, E. A., Kovalev, D. Y., & Novikov, A. V. (2014). Features of Structural and Phase Transformations in Mo–Si–B and Сr–Al–Si–B Systems During Self-Propagating High-Temperature Synthesis. Eurasian Chemico-Technological Journal, 16(1), 55–60. https://doi.org/10.18321/ectj169

Issue

Vol. 16 No. 1 (2014)

Section

Articles

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