Electron Microscopic Analysis of the Nb5Si3/NBC/NbSi2 Composite Structure

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Abstract

The method of aluminothermic self-propagating high-temperature synthesis was used to obtain a composite material based on Nb-Si-C. The study of this system is of interest from the point of view of obtaining high-temperature materials of a new generation for gas turbine engine building, capable of replacing heat-resistant nickel alloys, as well as the potential possibility of forming MAX-phases (phases Mn + 1AXn where n = 1, 2, 3, ...; M is transitional d-metal, A – p-element, X – carbon). The resulting Nb-Si-C composite were studied by X-ray diffraction, scanning electron microscopy, and X-ray spectral microanalysis. It is shown that NbC carbide and silicides γ-Nb5Si3 and NbSi2 are formed in the sample. A detailed analysis of the morphological distribution of the constituent phases has been carried out.

About the authors

R. M. Nikonova

Scientific Center for Metallurgical Physics and Materials Science, Udmurt Federal Research Center of the UB of the RAS

Author for correspondence.
Email: rozam@udman.ru
Russian Federation, Izhevsk

N. S. Larionova

Scientific Center for Metallurgical Physics and Materials Science, Udmurt Federal Research Center of the UB of the RAS

Email: rozam@udman.ru
Russian Federation, Izhevsk

V. I. Ladyanov

Scientific Center for Metallurgical Physics and Materials Science, Udmurt Federal Research Center of the UB of the RAS

Email: rozam@udman.ru
Russian Federation, Izhevsk

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Supplementary files

Supplementary Files
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2. Fig. 1. Diffractogram from Nb-Si-C sample and bar diagrams corresponding to phases NbSi2, NbC, Nb5Si3

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3. Fig. 2. Image of the sample fracture surface obtained by scanning electron microscopy

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4. Fig. 3. Distribution maps of Nb, Si, C on a separate section of the sample fracture surface

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