HIGH-TEMPERATURE OXIDATION PROTECTIVE COATINGS FOR VANADIUM-BASE ALLOYS. Bimonthly Report No. 4, December 12, 1961 to February 11, 1962

Technical Report · Wed Feb 28 23:00:00 EST 1962

OSTI ID:4807787

Holtz, F C

Coatings for the protection of vanadium alloys in air at 2000 deg F and up were investigated. Nickel, flame-sprayed on V-Nb alloys, forms an intermetallic compound and an outer glassy phase upon exposure to elevated- temperature air. Protection of V-lw/o Ti-60w/o Nb is afforded for 45 hr at 2200 deg F and more than 150 hr in air at 2000 deg F, After intentional defecting, failures are extremely slow compared to the unprotected alloy base. Siliconized V-lw/o Ti-60w/o Nb, produced in a static argon pack cementation process, is oxidation resistant for at least 800, 290, and 50 hr in static air at 2000, 2200, and 2500 deg F, respectively. Samples of V-5w/o Ti-20w/o Nb, coated similarly, are oxidation resistant for 456, 280, and 259 hr at 1500, 2000, and 2200 deg F, respectively. Coatings on the higher-Nb alloy show a capability for tolerating defects which has not been noted in the low-Nb alloy. Siliconized samples of V- lw/o Ti-60w/o Nb, deformed by bending at room temperature to a stress near the yield point, appear to be oxidation resistant when subsequently exposed to 2000 deg F air. (auth)

• Research Organization: Illinois Inst. of Tech., Chicago. Armour Research Foundation
• NSA Number: NSA-16-012083
• OSTI ID: 4807787
• Report Number(s): ARF-2227-4
• Country of Publication: United States
• Language: English

Related Subjects

AIR
ALLOYS
ARGON
CEMENTS
COATING
COMBUSTION
CORROSION PROTECTION
DEFECTS
DEFORMATION
DIFFUSION
DISPERSIONS
FAILURES
GLASS
HIGH TEMPERATURE
HYDROXIDES
INERT GASES
INTERMETALLIC COMPOUNDS
MATERIALS TESTING
METALS, CERAMICS, AND OTHER MATERIALS
NICKEL
NIOBIUM ALLOYS
OXIDATION
PHASE DIAGRAMS
SAMPLING
SILICON
SILICONES
SPUTTERING
STABILITY
STANDARDS
STRESSES
TENSILE PROPERTIES
TITANIUM ALLOYS
VANADIUM ALLOYS