INVESTIGATING OXIDATIONS OF NIOBIUMTITANIUM-ZIRCONIUM ALLOYS,
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 niobium/titanium 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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 26, 1965
- Accession Number
- AD0614017
Entities
People
- A. M. Ryabyshev
- D. A. Prokoshkin
- E. V. Vasil'eva
Organizations
- National Air and Space Intelligence Center