Ball milling of niobium

Recovery of niobium and tantalum by solvent ... The slag was ground in a ball mill to reach a particle size X 90mm. The chemical and physical characterization of the slag has been presented in a previous work.8 A mineral concentrate obtained by the milling, gravimetric concentration

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  • Comparative Study of Phases Forming in Niobium

    Comparative Study of Phases Forming in Niobium

    Comparative Study of Phases Forming in Niobium-Antimony Oxides System upon High Temperature Treatment and High-Energy Ball Milling P. Dulian a;*, M. Piz b, E. Filipek b and K. Wieczorek-Ciuroaw a aCracow University of ecThnology, acultFy of Chemical Engineering and ecThnology, Warszawska 24, 31-155 Krak w, Poland

  • (PDF) Mechanochemical Synthesis of Niobium Hydrides

    (PDF) Mechanochemical Synthesis of Niobium Hydrides

    The synthesis of niobium hydrides under ball milling of the pure Nb powder in hydrogen atmosphere or in the presence of H2O traces was investigated. It was shown by XRD method that niobium hydride

  • Supersaturated solid solution of niobium in copper by

    Supersaturated solid solution of niobium in copper by

    Mar 10, 2003 Nb using a planetary ball mill. The Cu–Nb phase diagram shows a negligibly low mutual solubility in the solid state, but high energy ball milling can largely extend the region of solid state solution. Previously, it was observed that niobium partly dissolves in the copper lattice during milling

  • Anisotropy of microstructure and elastic properties of

    Anisotropy of microstructure and elastic properties of

    Feb 01, 2020 The nanocrystalline niobium carbides NbC y powders were produced by high-energy ball milling in a PM-200 Retsch planetary ball mill with the angular speed of rotation ω equal to 8.33 revolutions per second (rps) for 5, 10, and 15 h. The mass of powder taken for milling was 10 g. The milling technique is described in detail in works [6,15]

  • Mechanochemically assisted preparation of NbB2 powder

    Mechanochemically assisted preparation of NbB2 powder

    Jan 01, 2006 A powder mixture of niobium and amorphous boron in 1:2 atomic ratio was milled using a planetary ball mill (Fritsch, Pulverisette 6) for 5–50 h at 600 rpm. For the milling, balls with diameters of 5, 9 or 16 mm were used and the effect of the ball size on the preparation of the NbB 2 was examined. We used a stainless steel vial and milling media

  • Synthesis and advanced dehydrogenation properties of

    Synthesis and advanced dehydrogenation properties of

    Jul 26, 2013 In this paper, niobium-based ammine borohydride has been synthesized via a simple ball milling of NbCl 5 5NH 3 and MBH 4 (M = Li, Na) with a molar ratio of 1:5. Thermogravimetric analysis–mass spectrometry (TGA–MS) and temperature-programmed-desorption (TPD) results revealed that the dehydrogenation of NbCl 5 5NH 3 /5LiBH 4 and NbCl 5 5NH 3 /5NaBH 4 mixtures showed a

  • Microstructures and Mechanical Properties of Nb/Nb

    Microstructures and Mechanical Properties of Nb/Nb

    To develop advanced structural materials at very high temperatures, ball milling followed by reactive hot pressing was employed to fabricate binary Nb/Nb-silicide in-situ composites with 3.5 to 16 mol% silicon content. Changes in morphology during milling of niobium and silicon elemental powders were studied, and microstructures and mechanical properties of reactively hot pressed composites

  • Effect of niobium and aluminium additions in TiAl

    Effect of niobium and aluminium additions in TiAl

    Mar 15, 2008 Mechanical alloying (MA) of TiAl/TiAl–xNb–yAl–1Cr (x = 4, 8 and 12, y = 2.5, 4 and 6.5 in at.%) was carried out with optimized ball milling parameters.MA of prealloyed TiAl powder resulted nanocrystalline structure at early stages of MA and sustained up to 50 h.TiAl–Nb–Al–Cr systems exhibited amorphous structure in lower Nb and Al content and formation of Nb 2 Al nanocrystalline

  • Comparison of Two Powder Processing Techniques on the

    Comparison of Two Powder Processing Techniques on the

    Jan 19, 2014 High porosity of 3–9%, Fe and niobium oxidations, from grinding media and ethanol during ball milling led to low electrical conductivity of the milled Cu-NbC composite. The electrical conductivity of the HPTed Cu-NbC composite showed a value 50% higher than that of milled Cu-NbC composite of the same composition

  • Structure of nanocomposite metal hydrides - ScienceDirect

    Structure of nanocomposite metal hydrides - ScienceDirect

    Jan 17, 2002 The result of ball milling MgH 2 +5at.%Nb mixture is the formation of a nanocomposite with niobium evenly distributed in the magnesium hydride matrix with an Nb average particle diameter of 63 nm. The crystallite sizes of β-MgH 2, γ-MgH 2, and β-NbH in the as-ball milled powder are, respectively, 8.3, 11.2 and 30 nm. After one

  • Effect of High Energy Milling Time of the Aluminum Bronze

    Effect of High Energy Milling Time of the Aluminum Bronze

    The aluminum bronze chips were submitted to high energy ball milling process with 3% of niobium carbide (NbC) addition. The NbC is a metal-ceramic composite with a ductile-brittle behaviour. It was analyzed the morphology of powders by scanning electron microscopy as well as particle size it

  • Alloy and Powder Preparation of High Niobium Containing

    Alloy and Powder Preparation of High Niobium Containing

    High Nb containing TiAl based alloys exhibit excellent corrosion resistance to molten zinc. They are expected to serve as the potential coating materials of corrosion resistance to molten zinc. Four TiAl-Nb alloys of good oxidation resistance and their powders were prepared by arc-melting and ball milling, respectively. The Microstructure, Hardness, Coefficient of thermal expansion, and grain

  • Compact Process for the Preparation of Microfine Spherical

    Compact Process for the Preparation of Microfine Spherical

    Feb 10, 2015 The procedure was performed for 30 min in a vibration ball milling machine with the frequency of 1400 Hz. The milling is in argon atmosphere with a ball-to-powder ratio of 10:1. To avoid the overheating of milling cans, the mill was paused for 5 min after a 5 min run, and 2 wt.% alcohol was added to reduce the bonding between balls and powders

  • Processing parameters in the ball milling of niobium

    Processing parameters in the ball milling of niobium

    In order to produce niobium-base parts, its powder can be obtained through a powder metallurgy’s method called ball milling. In this article, the ball milling parameters, in the production of niobium’s powder,have been optimized using the Taguchi’s method in order to obtain a

  • Structural evolution during intense ball milling of copper

    Structural evolution during intense ball milling of copper

    Sep 15, 1992 OSTI.GOV Journal Article: Structural evolution during intense ball milling of copper-niobium mixtures Title: Structural evolution during intense ball milling of

  • High-energy ball milling of nonstoichiometric compounds

    High-energy ball milling of nonstoichiometric compounds

    Apr 01, 2020 Ball milling is a simple and efficient method for making nanocrystalline powders of various metals and alloys, oxides, carbides, sulfides, borides, and other compounds [1,7–21] with particles up to 20 nm in size intended for superconducting ceramic materials, materials with magnetic anisotropy, superhard metal-cutting materials, nanocomposites, and superplastic ceramics. High

  • Niobium Carbide-Reinforced Al Matrix Composites Produced

    Niobium Carbide-Reinforced Al Matrix Composites Produced

    Mar 28, 2017 The first successful use of ball milling to produce ceramic-reinforced metal matrix composites was reported by Benjamin, producing Y 2 O 3 dispersion strengthening on Cr, Al, and Ti containing Ni-based superalloys. At that time, the intention was to combine oxide dispersion strengthening (ODS) to gamma prime precipitation strengthening, for high-temperature applications

  • Ball-milling of elemental powders—compound formation

    Ball-milling of elemental powders—compound formation

    Sep 01, 1991 Mechanical alloying of elemental powders has been carried out by ball-milling in a number of systems containing boron and silicon with chromium and niobium. Detailed analysis of the milled powders has been performed by X-ray diffraction and electron microscopy as a

  • Milling of nonstoichiometric niobium carbide powder to a

    Milling of nonstoichiometric niobium carbide powder to a

    Dec 17, 2014 Using high-energy ball milling, we obtained nanocrystalline nonstoichiometric NbC y niobium carbide powders. The crystal structure, microstructure, and particle size distribution of the starting and milled powders were determined using X-ray diffraction, laser diffraction, and scanning electron microscopy

  • Mechanism of solid-gas reaction for formation of

    Mechanism of solid-gas reaction for formation of

    Mar 03, 2011 This nonequilibrium phase has been synthesized by milling elemental niobium (Nb) powders under purified nitrogen gas flow using a high energy ball mill at room temperature. The progress of the solid-gas reaction for the Nb-N system has been followed by means of x-ray diffraction, differential thermal analysis, transmission electron microscopy, and chemical analysis

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