HIGH-TEMPERATURE OXIDATION PROTECTIVE COATINGS FOR VANADIUM-BASE ALLOYS

Several types of coatings were studied for the protection of V-base alloys in air at 2000 F ORABOVE. A specimen of V-1 wt-% Ti-60 BaTiO3 Nb siliconized by pack-cementation, withstood exposure to 2000 F air for 500 hr without evidence of failure or hardening of the alloy base. At 2200 F, a similar co...

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Bibliographic Details
Main Author: HOLTZ,F C
Format: Report
Language:English
Subjects:
ALUMINUM ALLOYS
ANTIOXIDANTS
BARIUM COMPOUNDS
BONDING
CEMENTS
CERAMIC COATINGS
CHROMIUM ALLOYS
COATINGS
FLAME SPRAYING
GOLD ALLOYS
IRON ALLOYS
LIQUIDS
MAGNESIUM ALLOYS
METAL COATINGS
NICKEL ALLOYS
OXIDES
PLATING
SILICON COATINGS
SINTERING
TEMPERATURE
TITANATES
TITANIUM ALLOYS
VANADIUM ALLOYS
VANADIUM COMPOUNDS
YTTRIUM COMPOUNDS
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Summary:Several types of coatings were studied for the protection of V-base alloys in air at 2000 F ORABOVE. A specimen of V-1 wt-% Ti-60 BaTiO3 Nb siliconized by pack-cementation, withstood exposure to 2000 F air for 500 hr without evidence of failure or hardening of the alloy base. At 2200 F, a similar coating failed at a corner in 16.5 hr, although the remainder of the coating afforded good protection. Small quantities of Y2O3 produced a substantial increase in the mp of V2O5, and the oxide mixture offered shorttime protection to the V alloy base at 2000 F. Roll-cladding of 70Fe-25Cr-5Al sheet to V-5 wt-% Ti-20 wt-% Nb at 2000 F produced a strong bond. Liquid-phase sintered Cr-Au, a fused NiCr base alloy, and flame-sprayed BaTiO3 gave protection for 0.5 to 1 hr at 2000 F. (A UTHOR)