Accession Number:

AD0614017

Title:

INVESTIGATING OXIDATIONS OF NIOBIUMTITANIUM-ZIRCONIUM ALLOYS,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Report Date:

1965-03-26

Pagination or Media Count:

11.0

Abstract:

The oxidation kinetics of niobium base alloys with constant titanium content of 5 and 10 weight was investigated in air at 1000, 1200C. The zirconium content in the test alloys varied between 0.5 - 25 weight . It was established, that addition of zirconium to niobiumtitanium alloys in amount of up to 5 weight causes an increase in their rate of oxidation. A further increase in zirconium content gives a reduction in rate of oxidation at all investigated temperatures. Alloys with 5 weight of Ti at all temperatures and zirconium concentrations had a somewhat higher rate of oxidation, than alloys with 10 weight of Ti. An x-ray structural analysis was made of alloy scales, the results of which enabled one to establish, that a reduction in rate of oxidation of alloys, containing more than 5 weight of Zr, is due to the formation in the scale of a 6Zr2.Nb2O5 compound. The rate of oxygen diffusion through the lattice of this compound apparently, is considerably lower than through the lattice of niobium titanium alloys. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE