HIGH-TEMPERATURE OXIDATION PROTECTIVE COATINGS FOR VANADIUM--BASE ALLOYS. Final Report, September 13, 1962- August 12, 1963
Basic pack-siliconizing parameters -----time, temperature, activator concentration, and location----- and edge and surface preparation techniques were optimized for thin 0.020- to 0.030-inch sheet with respect to static and dynamic oxidation life, coating thickness, and coating adherence during elastic and plastic deformation. Processing for 8 hours at 2150 deg F with either an isolated or mixed activator-silicon pack yields coatings of optimum thickness, i.e., 2.25 to 3 mils. Static oxidation life of V-60 wt% Nb- 1 wt% Ti-coated under these conditions is greater than 500 hours at 2200 deg F. Sixteen other niobium-vanadium-base alloys containing various refractory metal additions were pack-siliconized and oxidation tested. Minimum static oxidation life was established at 150 hours at 2200 deg F for each of the alloys. Oxidation behavior of compounds based on (V,Nb)Ni/sub 2/, (V,Nb)Ni/sub 3/, (V,Nb)Co/sub 2/, and (V,Nb)Co/sub 3/ were studied at 2000 and 2200 deg F. The cobaltcontaining compounds had relatively poor oxidation resistance. Compounds of V- Nb - Ni were flame-sprayed on V--60 wt% Nb-- 1 wt% Ti, but excessive porosity caused rapid failure in 2000 deg and 2200 deg F air. (auth)
- Research Organization:
- Illinois Inst. of Tech., Chicago. IIT Research Inst.
- NSA Number:
- NSA-17-035997
- OSTI ID:
- 4637069
- Report Number(s):
- HTRI-B6001-5
- Country of Publication:
- United States
- Language:
- English
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