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COLUMBIUM-OXYGEN SYSTEM

Journal Article · · Trans. Am. Soc. Metals
OSTI ID:4168131
The niobium-oxygen equilibrium system was determined by metallographic examination of arc-cast alloys made of electron-gun-refined niobium metal and special purity niobium pentoxide. Two intermediate oxides, NbO and NbO/sub 2/, melt without decomposition at 1945 and 1915 deg C (3533 and 3479 deg F), respectively. Eutectic reactions exist between niobium and NbO at 1915 deg C (3479 deg F) and between NbO and NbO/sub 2/ at 1810 deg C (3290 deg F). Experimental evidence supponts a peritectric reaction between NbO/sub 2/ and Nb/ sub 2/O/sub 5/ at 1510 deg C (2750 deg F). The maximum solid solubility of oxygen in niobium metal is 0.72 weight%. (ASM-SLA Classification: M24b; Nb,O). (auth)
Research Organization:
Armour Research Foundation, Illinois Inst. of Tech., Chicago
NSA Number:
NSA-14-022079
OSTI ID:
4168131
Journal Information:
Trans. Am. Soc. Metals, Journal Name: Trans. Am. Soc. Metals Vol. Vol: 52
Country of Publication:
Country unknown/Code not available
Language:
English