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Phase Formation in the SHS of a Ti–B Mixture with the Addition of Si3N4

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Combustion, Explosion, and Shock Waves Aims and scope

Abstract

The structure and phase composition of a material obtained via SHS in the combustion of a 87% Ti + 13% B powder mixture with the addition of Si3N4 is under study. The phase formation mechanism in this system is discussed. It is established that the material contains 64% of the TiB phase with an orthorhombic structure and 36% of the solid boron solution in titanium (\(\alpha\)-Ti[B]). The boron content in \(\alpha\)-Ti significantly exceeds its equilibrium content according to a state diagram. In the case of combustion of an 87% Ti + 13% B mixture with the addition of 5% Si3N4, the finite product contains TiB, \(\alpha\)-Ti[B], TiB2, and Ti5Si3 phase. The TiB phase is present in the form of two modifications: orthorhombic and cubic. The completeness of a structural transition of the cubic modification of TiB into an orthorhombic one is determined by the cooling rate of a sample. It is assumed that the combustion of the mixture with the addition of Si3N4 forms the dispersed discharges of TiN, which are the crystallization centers of cubic TiB.

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Authors and Affiliations

  1. Merzhanov Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    D. Yu. Kovalev, A. S. Konstantinov, S. V. Konovalikhin & A. V. Bolotskaya

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  1. D. Yu. Kovalev
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  2. A. S. Konstantinov
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  3. S. V. Konovalikhin
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  4. A. V. Bolotskaya
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Correspondence to D. Yu. Kovalev.

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Kovalev, D.Y., Konstantinov, A.S., Konovalikhin, S.V. et al. Phase Formation in the SHS of a Ti–B Mixture with the Addition of Si3N4 . Combust Explos Shock Waves 56, 648–654 (2020). https://doi.org/10.1134/S0010508220060040

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  • DOI: https://doi.org/10.1134/S0010508220060040

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