AN INVESTIGATION OF THE EFFECT OF METALLIC ADDITIONS UPON THE OXIDATION RESISTANCE OF NbAl$sub 3$. Quarterly Progress Report No. 1, September 1, 1961-February 28, 1962

Technical Report · Thu Mar 01 04:00:00 EST 1962

OSTI ID:4818514

Wells, R L; Klodt, D T; Lundin, C E

The effect of additions of Ti, V, Zr, Sn, or Si on the airoxidation resistance of NbAl/sub 3/ was investigated. NbAl/sub 3/ compound alloys containing up to 10 wt.% of the additional element were arc melted in a cold- crucible, non-consumable electrode arc furnace. The as-cast alloys are homogenized and then subjected to screening air-oxidation tests at 760 deg C in dry and humid air. Alloy compositions which exhibit good oxidation resistance after a 1000-hour exposure were studied by a thermo-gravimetric technique to determine the rate laws governing the oxidation. Also, the phase equilibria of the alloys were investigated after isothermal anneals at 750, 850, 1000, 1150, 1250, and 1370 deg C. Data are presented for screening oxidation tests on a number of alloys and weight gain versus time curves for NbAl/sub 3/, 53.5 Nb 36.5 Al 10 Ti, and 51 Nb 44 Al 5 Sn are reported. Phase equilibria data for NbAl/sub 3/-compound alloys with Ti and Zr additions are also presented. (auth)

• Research Organization: Denver, Univ. Denver Research Inst.
• NSA Number: NSA-16-024174
• OSTI ID: 4818514
• Report Number(s): TID-16032; DRI-2032
• Country of Publication: United States
• Language: English

Related Subjects

AIR
ALLOYS
ALUMINUM ALLOYS
ANNEALING
CASTING
COLD WORKING
COMBUSTION
CRUCIBLES
DIAGRAMS
ELECTRIC ARCS
ELECTRODES
ELEMENTS
ENRICHMENT
FURNACES
GRAVITATION
HIGH TEMPERATURE
HUMIDITY
INTERMETALLIC COMPOUNDS
MELTING
METALS, CERAMICS, AND OTHER MATERIALS
NIOBIUM ALLOYS
OXIDATION
PHASE DIAGRAMS
SILICON
STABILITY
TESTING
TIN
TITANIUM
VANADIUM
WEIGHT
ZIRCONIUM