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Activation Energy and Mechanism of the Molybdenum Disilicide Sintering Process

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Inorganic Materials Aims and scope

Abstract—

This paper presents dilatometric analysis data for the sintering of off-the-shelf molybdenum disilicide (MoSi2) powder prepared by magnesiothermic synthesis. We have obtained continuous shrinkage curves for MoSi2 powder compacts with an initial relative density of 70% at different heating rates: 5, 10, 20, and 30°C/min. From a quantitative analysis of densification curves for the compacts, the activation energy for the initial stage of sintering has been determined to be Q = 695 kJ/mol. It has been shown that the dominant process in the initial stage of MoSi2 powder sintering is volume diffusion from grain boundaries and surfaces.

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ACKNOWLEDGMENTS

This work was supported by the Russian Foundation for Basic Research, grant no. Mol_a 18-38-00327. The experimental work (X-ray diffraction, scanning electron microscopy, and particle size analysis) was supported by the Russian Federation Ministry of Science and Higher Education (state research target no. 007-00129-18-00). We are grateful to our colleagues at OOO Plazmoterm for supplying the raw materials and for fruitful discussions.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Leninskii pr. 49, 119334, Moscow, Russia

    D. D. Titov, Yu. F. Kargin, A. S. Lysenkov, N. V. Petrakova, O. S. Antonova, A. A. Konovalov, A. A. Ashmarin & A. V. Shokod’ko

  2. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, ul. Akademika Osip’yana 8, 142432, Chernogolovka, Moscow oblast, Russia

    P. A. Miloserdov

  3. St. Petersburg State Technological Institute (Technical University), Moskovskii pr. 24–26/49, 190013, St. Petersburg, Russia

    S. N. Perevislov

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  1. D. D. Titov
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  2. Yu. F. Kargin
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  3. A. S. Lysenkov
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  6. N. V. Petrakova
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  8. A. A. Konovalov
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  10. A. V. Shokod’ko
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Correspondence to D. D. Titov.

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Translated by O. Tsarev

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Titov, D.D., Kargin, Y.F., Lysenkov, A.S. et al. Activation Energy and Mechanism of the Molybdenum Disilicide Sintering Process. Inorg Mater 54, 1113–1118 (2018). https://doi.org/10.1134/S0020168518110134

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