PRODUCTION OF NIOBIUM CARBIDE

PROBLEM TO BE SOLVED: To produce low-oxygen, low-free carbon and high-quality niobium carbide in a good yield. SOLUTION: Niobium oxide is mixed with carbon and primary carbonization is carried out at a prescribed temp., preferably 1,400-1,800 deg.C in a hydrogen furnace. The amts. of oxygen and free...

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Bibliographic Details
Main Authors SUGIMOTO TSUKASA, ISAKA HIROMICHI
Format Patent
LanguageEnglish
Published 15.02.2000
Edition7
Subjects
CHEMISTRY
COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Summary:PROBLEM TO BE SOLVED: To produce low-oxygen, low-free carbon and high-quality niobium carbide in a good yield. SOLUTION: Niobium oxide is mixed with carbon and primary carbonization is carried out at a prescribed temp., preferably 1,400-1,800 deg.C in a hydrogen furnace. The amts. of oxygen and free carbon in the resultant carbide are measured, carbon is added to the primary carbide by an amt. adjusted on the basis of the measurements and secondary earbonization is carried out at a prescribed temp., preferably 1,800-2,000 deg.C in a vacuum carbonization furnace.
Bibliography:Application Number: JP19980215335