Aluminothermic Reduction
Mostrando 1-8 de 8 artigos, teses e dissertações.
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1. Aluminothermic reduction of Cr2O3 contained in the ash of thermally treated leather waste
In this study the viability of utilising ashes with high chromium oxide content, obtained by thermal treatment of footwear leather waste, in the production of low-carbon ferrochromium alloy (Fe-Cr-LC) by aluminothermic reduction was investigated. The following key-factors were selected for process modelling: the quantity of aluminium (Al) employed in the rea
Braz. J. Chem. Eng.. Publicado em: 2013-03
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2. Estudo sobre a redução aluminotérmica de Ta2O5 e TiO2 usando descarga de cátodo oco
No presente estudo foram utilizados dois óxidos metálicos, Ta2O5 e TiO2, visando a obtenção de partículas de Ta e Ti metálicos, por meio da redução aluminotérmica com ignição a plasma. Pós de Ta2O5 e TiO2 foram misturados com pó de Al e moídos em um moinho planetário por diferentes períodos. Um estudo de análise térmica (DTA e TG) foi reali
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 29/04/2011
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3. Revestimentos a base de Ta/Al2O3 produzidos por aspersão térmica sobre substrato metálico / Ta/Al2O3 coatings produced by thermal spray on metallic substrate
Substratos metálicos de aço inox 416 foram revestidos por aspersão térmica em tocha de plasma. Eles foram posicionados a uma distância de 4 e 5 cm em relação ao bocal de saída do jato de plasma. Os materiais de partida utilizados para as deposições foram pós de óxido de tântalo e alumínio. Esses dois pós foram misturados e moídos em moinho de
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 17/09/2010
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4. Study of the aluminothermic reduction of niobium pentoxide through thermal analysis experiments and high energy milling processing
Aluminothermic reduction of niobium pentoxide was studied through thermal analysis techniques such as differential thermal analysis (DTA) and thermogravimetry (TG) as well as through high energy milling processing. Reactants mixtures were composed by powders of Nb2O5 and Al. In the case of DTA-TG experiments, different molar ratios Nb2O5:Al were heated in a
Materials Research. Publicado em: 2007-06
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5. Obtenção de pós de tântalo metálico a partir da redução aluminotérmica com ignição a plasma
Metallic tantalum has a high commercial value due to intrinsic properties like excellent ductility, corrosion resistance, high melt and boiling points and good electrical and thermal conductivities. Nowadays, it is mostly used in the manufacture of capacitors, due to excellent dielectric properties of its oxides. In the nature, tantalum occurs in the form of
Publicado em: 2007
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6. Redução aluminotérmica do óxido de tântalo usando uma tocha de plasma como ignitor
In this work was used a plasma torch of non transferred arc with argon as work gas, using a power supply with maximum DC current of 250 A and voltage of 30 V to activate the plasma and keep it switched on. The flame temperature was characterized by optical emission spectroscopy, through Boltzmann-plot-method. The torch has been used like igniter in the alumi
Publicado em: 2007
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7. Obtenção de pós de Nb a partir da redução aluminotérmica com ignição por plasma
The aluminothermic reduction consists in an exothermic reaction between a metallic oxide and aluminum to produce the metal and the scum. The extracted melted metal of that reaction usually comes mixed with particles of Al2O3 resulting of the reduction, needing of subsequent refine to eliminate the residual impure as well as to eliminate porosities. Seeking t
Publicado em: 2005
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8. Determinação de Co, Cu, Mn, Mo,Na, Sn e Ti em niobio e tantalo, por absorção da matriz com diatipirilmetano
Determination of metallic impurities in niobium and tantalum by flame atomic absorption spectrophotometry (or atomic emission), without matrix separation is not possible due to interferences. This work describes the procedure to effect this separation: niobium or tantalum was extracted in 1,2- dichloroethane by means of their complexes with diantipyrylmethan
Publicado em: 1987