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- W2247661006 abstract "The protective action of a zinc-base coating on niobium is caused by the formation of a tight layer of ZnO. Any breaks occurring in the oxide barrier are self-healed by the formation of additional ZnO resulting from the reaction of air with zinc vapor from zinc-rich intermetallic compounds between the oxide barrier and the niobium. The zinc-niobium phase diagram was determined sufficiently well to place the temperature limitation of the coating at 2048 deg F, at which temperature the most stable niobium-zinc compound decomposes. Alloy additions have not raised this ceiling while at the same time retaining the self-healing properties. No other metals were found which are as satisfactory as zinc in forming protective coatings for niobium. It appears that zinc is as sultable for niobium alloys as it is for pure niobium, unless these contain high percentages of vanadium. Complex shapes can be vapor coated, but this process does not permit the admixture with the zinc of small amounts of aluminum, titanium, and zirconium, which appear desirable for reliability, panticularly at lSOO to 2000 deg F. An appropriate approach for coatings for 2200 to 2300 deg F may be to substitute zinc for metal A in compounds A/sub x/Nb/submore » y/ which are stable at the higher temperatures. Another approach may be the use of a cladding metal which would dissolve sufficient zinc at high temperatures to maintain a ZnO barrier. (auth)« less" @default.
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- W2247661006 date "1960-08-01" @default.
- W2247661006 modified "2023-09-26" @default.
- W2247661006 title "PROTECTION OF REFRACTORY METALS FOR HIGH TEMPERATURE SERVICE. THE ZINC- BASE COATING FOR NIOBIUM. Progress Report 1, July 1, 1960" @default.
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