Phase-to-phase borders interaction in the Nb-matrix composite material reinforced by single-crystal fibers α-Al2O3

Schetanov B. V., Efimochkin I.Yu., Paegle S.V.
UDC
669.018.95
DOI
10.18577/2307-6046-2016-0-4-6-6
Article PDF (Russian) (764.67 KB)
How to cite
Schetanov B. V., Efimochkin I.Yu., Paegle S.V. Phase-to-phase borders interaction in the Nb-matrix composite material reinforced by single-crystal fibers α-Al2O3 // Proceedings of VIAM. 2016. No. 4. DOI: 10.18577/2307-6046-2016-0-4-6-6. URL: https://test.viam.ru/en/journal/2016/4/6
Abstract

A set of experimental samples of fibrous composite material (CM) was fabricated by hot pressing of niobium powder and continuous single-crystal fibers α-Al2O3 with TiN or Mo coatings and without them. The investigation of interactions on phase-to-phase borders in the CM has shown, that molybdenum diffusion-barrier coating, in comparison with TiN coating, is more effective as corrosion protection of single-crystal fibers α-Al2O3 at higher (>1300°С) temperatures and more use time. It has been found that the high-temperature bending strength at 1300°C of the initial CM reinforced by fibers without coating 2,2 times higher than for the pure (Nb) matrix; for the CM reinforced by fibers with TiN coating this value is 1,8 times higher. The strength of the material reinforced by TiN-coated fibers increases after heat aging and exceeds the strength of matrix 2,4 times. High-temperature strength of the initial CM with Mo-coated fibers and after heat aging are about similar and exceeds the stren

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