ON THE VACUUM REDUCTION OF NIOBIUM PENTOXIDE WITH NIOBIUM CARBIDE

Journal Article · Mon Jan 01 04:00:00 EST 1962 · Nippon Kinzoku Gakkaishi (Japan)

OSTI ID:4694121

Kimura, H; Sasaki, Y

Using the vacuum process, carbide reduction of niobium pentoxide due to the following reaction was investigated experimentally: Nb/sub 2/O/sub 5/ + 5 NbC = 7 Nb + 5 CO. The mixing ratio of Nb/sub 2/O/sub 5//NbC was varied from 33/67 to 45/55. By means of fluctuation measurements of pressure and temt the reaction began to proceed rapidly above 1700 un. Concent 85% C. Crude niobium metal, containing 96 to 97% Nb, was obtained easily by this process. The purification of crude niobium metal obtained above was examined in a series of vacuum refining experiments. Impurities, such as carbon, oxygen, and nitrogen in niobium metal decreased at the refining temperature above 2150 un. Concent 85% C at the pressure of 10/sup -5/ mm Hg. The removal of carbon during refining process was dependent on both temperature and oxgen content. Rapid removal of oxygen was observed inr the presence of carbon. Cold rolling was attempted on each specimen of refined metals, and fabricable specimens containing above 99.7% Nb showed a Vickers hardness lower than 200. (auth)

• Research Organization: National Research Inst. for Metals, Tokyo
• NSA Number: NSA-17-021600
• OSTI ID: 4694121
• Journal Information: Nippon Kinzoku Gakkaishi (Japan), Journal Name: Nippon Kinzoku Gakkaishi (Japan) Vol. Vol: 26; ISSN NIKGA
• Country of Publication: Country unknown/Code not available
• Language: Japanese

Related Subjects

CARBON
CHEMISTRY
COLD WORKING
HARDNESS
HIGH TEMPERATURE
IMPURITIES
MIXING
NIOBIUM CARBIDES
NIOBIUM OXIDES
NITROGEN
OXYGEN
PRESSURE
REACTION KINETICS
REDUCTION
REFINING
ROLLING
TEMPERATURE
VACUUM