In most steels, niobium is in solution at the slab reheating temperature, but when present in excess it acts to refine the austenite grain size. rolling, niobium retards the recovery and recrystallization processes which form the basis for thermomechanicl treatments, and its effectiveness in small amounts distin- guishes it from other microalloy...

2023年6月3日 · Niobium metallurgy is the technology of extracting the metal niobium from niobium-containing materials. In 1801, the British chemist C. Hatchett discovered a new element when analyzing ores and named it columbium.

2020年12月1日 · The extractive metallurgy of Ta and Nb involves leaching, solvent extraction and stripping of Ta and Nb complexes and their precipitation as hydroxides. Current industrial practice use leaching of colombo-tantalite ores by a mixture …

Niobium (Nb) has a body-centred cubic (bcc) crystal structure and a melting point of 2,468 °C (4,474 °F). Of the refractory metals, it has the lowest density and best workability; for this reason, niobium-based alloys are often used in aerospace applications.

Powder metallurgy processing was also explored for making porous niobium structures to withstand high heat flux as anticipated in the National Aerospace Plane (NASP). The ability to manufacture porous structures and the compatability of niobium alloys with liquid lithium make it an ideal material for lithium cooled heat pipes.

Niobium metallurgy is the technology of extra-cting the metal niobium from niobium-containing materials. In 1801, the British chemist C. Hatchett discovered a new element when analyzing ores and named it columbium. In 1844, the German chemist H. Rose declared that he had discovered a …

It is well known that niobium is added to a wide range of steels for improving processing, microstructure, properties and performance. Over the last two decades, the use of Nb has also permitted new steels with attractive properties to be developed.

2017年11月13日 · Extractive Metallurgy of Niobium presents a vivid account of the metal through its comprehensive discussions of properties and applications, resources and resource processing, chemical...

The electrolysis of molten baths containing K/sub 2/NbOF/sub 5/ or K/sub 2/NbF/sub 7/ produced niobium metal. The more promising methods of preparation for Nb metal at the present time include the reaction of Nb/sub 2/O/sub 5/ with C, the H/sub 2/ and active metal reduction of NbC1/sub 5/, and electrolysis of K/sub 2/NbF/sub 7/- NaC1 melts.

2017年11月13日 · Extractive Metallurgy of Niobium presents a vivid account of the metal through its comprehensive discussions of properties and applications, resources and resource processing, chemical processing and compound preparation, metal extraction, and refining and consolidation.