Accession Number:

AD0265797

Title:

INTERMEDIATE STAGES OF REACTIONS FORMING CARBIDES OF TITANIUM, ZIRCONIUM, VANADIUM, NIOBIUM, AND TANTALIUM

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Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

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Pagination or Media Count:

1.0

Abstract:

Tensimetric examination was made of the formation of the carbides TiC, ZrC, VC, NbC and TaC in a vacuum. During x-ray and chemical analysis of intermediate and final products, and also during the calculation of approximate heat values of their formation, the passage of the reaction is confirmed for obtaining TiC, and ZrC through the stage of intermediate oxides Ti2O3, Ti3O5, TiO and Zr2O3, ZrO, respectively and also for the reaction of forming carbides of V from V2O3 5C, of Nb and Ta from Nb2O5 7C and Ta205 7C through the stage of intermediate oxides VO, V4O and TaO2, Ta4O. The presence of intermediate oxides of Zr, Zr2O3 and ZrO, and similar corresponding oxides Ti2 3 and Ti0 is indicated, and it was established that ZrO has a cubic face-centered lattice with period a equal 4.62 Angstrom. The conditions for obtaining NbC and TaC in a vacuum were made more precise. Author

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APPROVED FOR PUBLIC RELEASE