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High-Temperature Oxidation Protective Coatings for Vanadium-Base Alloys

Author: Rausch, J. J.
Author: Holtz, F. C.
Corporate Author: Armour Research Foundation
Corporate Report Number: ARF-B6000-2
Date of Publication: 1963-02-09
Pages: 10
Contract: N600(19)59182
AD Number: AD0296760
Original AD Number: AD-296 760

Processing variables relating to the pack-siliconizing of V-5w/o Ti-20w/o CB and V-1w/o Ti-60w/o Cb are being studied. Samples coatedd at 2010, 2190. and 2370 F show that coating growth rate is time dependent up to 16 hours. Silicide coatings have been applied to eleven vanadium alloys currently under development, and no failures have been observed after 15 to 35 hours in 2200 F air. Tensile and other specimens of V-1w/o Ti-60w/o Cb have been pack-siliconized for evaluation by aerospace and other organizations. Compounds of V-Cb-Ni were flame-sprayed on V-1w/o Ti 60w/o Cb, but excessive porosity caused rapid failure in 2000 and 2200 F air. Diffusion couples of nickel and the V-Cb-Ti alloy were reacted at 2000 and 22000 F for 24 and 8 hours, respectively, with very slight hardening of the vanadium alloy.

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