Vanadin Niob · Tantal

Kieffer, R.; Braun, Horst

doi:10.1007/978-3-642-51098-4

Cited by 41 publications

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“…Questions on the metallurgy of vanadium including the specific behavior of vanadium‐containing slags were considered in detail in monographs 4, 5. It should be particularly mentioned that vanadium is widely used as the alloying element in steel, in magnetic alloys, in refractory alloys and as a useful additive to cast iron.…”

Section: Coefficients a And B In Eq (14) For The Temperature Dependementioning

confidence: 99%

High-temperature mass spectrometric study of the vaporization processes of V₂ O₃ and vanadium-containing slags

Wang¹,

Stolyarova²,

Лопатин³

et al. 2010

Rapid Commun. Mass Spectrom.

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A Knudsen effusion mass spectrometric method was used to study the vaporization processes and thermodynamic properties of pure V(2)O(3) and 14 samples of vanadium-containing slags in the CaO-MgO-Al(2)O(3)-SiO(2) system in the temperature range 1875-2625 K. The system was calibrated using gold in the liquid state as the standard. Vaporization was carried out from double tungsten effusion cells. First it was shown that, in vapor over V(2)O(3) and the vanadium-containing slags in the temperature range 1875-2100 K, the following vapor species were present: VO(2), VO, O, WO(3) and WO(2), with the latter two species being formed as a result of interaction with the tungsten crucibles. The temperature dependencies of the partial pressures of these vapor species were obtained over V(2)O(3) and the slags. The ion current comparison method was used for the determination of the V(2)O(3) activities in slags as a function of temperature with solid V(2)O(3) as a reference state. The V(2)O(3) activity coefficients in the slags under investigation indicated positive deviations from ideality at 1900 K and a tendency to ideal behavior at 2100 K. It was shown that the V(2)O(3) activity as a function of the slag basicity decreased at 1900 K and 2000 K and was practically constant in the slag melts at 2100 K. The results are expected to be valuable in the optimization of slag composition in high-alloy steelmaking processes as well as for their environmental implications.

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Section: Coefficients a And B In Eq (14) For The Temperature Dependementioning

confidence: 99%

High-temperature mass spectrometric study of the vaporization processes of V₂ O₃ and vanadium-containing slags

Wang¹,

Stolyarova²,

Лопатин³

et al. 2010

Rapid Commun. Mass Spectrom.

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“…Niobium is very resistant to most organic and inorganic acids, with the exception of HF, at temperatures up to 100 C [1]. Concentrated sulfuric acid above 150 C causes embrittlement.…”

Section: Chemical Propertiesmentioning

confidence: 99%

“…Some important physical properties of niobium metal are as follows [1][2][3] The mechanical properties, like those of most refractory metals, are influenced by the purity of the metal, the production method, and the mechanical treatment. Even small amounts of interstitial impurities increase the hardness and strength but reduce the ductility.…”

Section: Physical Propertiesmentioning

confidence: 99%

Niobium and Niobium Compounds

Albrecht

Cymorek

Eckert

2011

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Properties 2.1. Physical Properties 2.2. Chemical Properties 3. Occurrence 4. Processing of Niobium Ores 4.1. Winning of Pyrochlore Concentrates 4.2. Treatment of Pyrochlore Concentrates 4.3. Production of Niobium Oxide from Columbites and Tantalites 4.3.1. Extraction Processes 4.3.2. Chlorination 5. Niobium Compounds 5.1. Oxides 5.2. Halides 5.3. Carbides and Hard Materials 6. Niobium Metal 6.1. Reduction of Niobium Pentoxide 6.2. Reduction of Halides 6.3. Refining 6.4. Uses 7. Ferroniobium 7.1. Production 7.2. Uses of Ferroniobium 8. Analysis 9. Economic Aspects

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“…The specifically characteristic physical and mechanical properties of 99.9% pure tantalum are its high melting point, high density, excellent formability, good heat conductivity, very good toughness (even at low temperature) and its weldability. 1,2,6,7,15 Tantalum has the ability of taking up, interstitially, the elements hydrogen, oxygen, nitrogen and carbon. This real solubility can amount to considerable value.…”

Section: Propertiesmentioning

confidence: 99%

Tantalum—processing, properties and applications

Köck¹,

Paschen

1989

JOM

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Tantalum-the Earth's 49th most abundant element-is frequently produced as a by-product of tin smelting. The metal is also extracted from concentrates by reduction with sodium or fused-salt electrolysis; tantalum carbide is produced by carburization of Ta 2 0 s or tantalum hydride. Sintering, electric-arc melting and electron-beam melting are used to refine and purify raw tantalum. Tantalum's unique properties make it suitable for a number of diverse applications, including capacitors, chemical equipment, hardmetal tooling and alloys. Tantalum consumption is expected to increase in the capacitor market, because of the demand for electronics equipment.

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Vanadin Niob · Tantal

Cited by 41 publications

References 0 publications

High-temperature mass spectrometric study of the vaporization processes of V₂ O₃ and vanadium-containing slags

High-temperature mass spectrometric study of the vaporization processes of V₂ O₃ and vanadium-containing slags

Niobium and Niobium Compounds

Tantalum—processing, properties and applications

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Vanadin Niob · Tantal

Cited by 41 publications

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High-temperature mass spectrometric study of the vaporization processes of V2 O3 and vanadium-containing slags

High-temperature mass spectrometric study of the vaporization processes of V2 O3 and vanadium-containing slags

Niobium and Niobium Compounds

Tantalum—processing, properties and applications

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High-temperature mass spectrometric study of the vaporization processes of V₂ O₃ and vanadium-containing slags

High-temperature mass spectrometric study of the vaporization processes of V₂ O₃ and vanadium-containing slags