a calka spark discharge ball milling

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mechanical milling assisted by electrical discharge nasa ads

Sep 01, 2002· Glowdischarge millingwas found to promote solid-gas reactions whereasspark discharge millingpromotes fast fracturing, recrystallization, mineral reduction and solid-solid reactions. Mechanicalmillingis an effective technique for the preparation of fine metallic and ceramic powders and can also be used to drive a wide range of chemical

a new method of synthesizing ultrafine vanadium carbide by

Jan 01, 2012· In themillingprocess, thevialwas evacuated and then backfilled with high purity argon (0.1 MPa), and thevialwas then vibrated at a double amplitude of 10 mm and a frequency of 25 Hz. The dielectric barrier discharge plasma was generated by 24 kV of high-voltage alternating current at a frequency of 14 kHz

formation of amorphous and nanostructural powder particles

Formation of Amorphous and Nanostructural Powder Particles from Amorphous Metallic Glass Ribbons UsingBall Millingand ElectricalDischarge Milling. By AndrzejCalka, David Wexler, Dariusz Oleszak and J. Bystrzycki. Cite . BibTex; Full citation Publisher: 'Trans Tech Publications

a new methodof synthesizing ultrafine vanadium carbide by

Jan 01, 2012· For example,Calkaet al. prepared VC and V 2 C byball millingelemental vanadium and graphite for 70 h ; Zhang et al. prepared V 8 C 7 bymillinga mixture of V 2 O 5, Mg and graphite for 48 h and then conducting carburization treatment at 950 °C . However, the fabrication efficiency of VC is low with the traditional MA technique because of

mechanicalmillingassisted by electricaldischarge nasa ads

Mechanicalmillingis an effective technique for the preparation of fine metallic and ceramic powders and can also be used to drive a wide range of chemical reactions.Millingdevices include planetary machines, attritors and vibrational mills; products include amorphous, nanocrystalline and quasicrystalline materials, supersaturated solid solutions, reduced minerals, high-surface-area

andrzejcalka

Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science. Defect and Diffusion Forum

synthesis of nanopowders under high frequency electric

In recently,electric discharge assisted mechanical milling(EDAMM) method, which was developed byCalkaand Wexler [3], has been used to fabricate nano-powder and rapid synthesis of Bi and Sb

rapid synthesis of bi and sb sulfides using electric

In recently,electric discharge assisted mechanical milling(EDAMM) method, which was developed byCalkaand Wexler [3], has been used to fabricate nano-powder and rapid synthesis of Bi and Sb

what particle size range does ball mill grinding produce

Theball millis a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass

rapid transformation of hexagonal to cubicsilicon carbide

Apr 30, 2016·Silicon carbidepowder was successfully transformed from hexagonal SiC into cubic SiC using theelectric discharge assisted mechanical milling(EDAMM) method. Themillingprocess was conducted in nitrogen plasma at atmospheric pressure. The effects of pulsed alternating current (AC) and direct current (DC)dischargeon product formation were investigated

laser assisted guiding of electric discharges around

Electric breakdown in air occurs for electric fields exceeding 34 kV/cm and results in a large current surge that propagates along unpredictable trajectories. Guiding such currents across specific paths in a controllable manner could allow protection against lightning strikes and high-voltage capacitor discharges. Such capabilities can be used for delivering charge to specific targets, for

influence ofmilling conditionson the hydriding

Mg75 at.%, CB25 at.% (CB: carbon black) composites were synthesized at differentball milling conditions(millingenergy,millingduration, and environment) and their hydriding properties were characterized by high-pressure DSC. The SEM observations revealed that the samples consist of 5–15 μ m Mg particles, surrounded and in some cases coated by carbon particles

reaction synthesis of titanium silicides via self

Bandar AlMangour, Dariusz Grzesiak, Jenn-Ming Yang, In situ formation of TiC-particle-reinforced stainless steel matrix nanocomposites duringball milling: Feedstock powder preparation for selective laser melting at various energy densities, Powder Technology, …

us5383615a ball millingapparatus google patents

ball millrotation arc Prior art date 1989-10-03 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Fee Related Application number US07/842,419 Inventor AndrzejCalkaBarry W. Ninham

physica status solidi (a) vol 217, no 23

FeSiCr nanoparticles are prepared by plasma arcdischargeandball millingprocesses. The minimum reflection loss (RL min) of FeSiCr nanoparticles afterball millingfor 6 h reaches −41.5 dB at 6.2 GHz and the effective absorbing bandwidth (RL < −10 dB) improves from 4.5 to 8.1 GHz (d = 2.2 mm)

ep0494899a4 ball milling apparatus andmethod, and

Aball millfor use in mechanical alloying and grinding comprising a plurality of ferromagnetic balls (22) within a spherical or generally cylindrical chamber or cell (20) of a paramagnetic material. The cell has a substantially horizontal axis of rotation (21). At least one magnet (24) is mounted outside the chamber to produce a magnetic field within the chamber

direct synthesis of aln nano powder by dielectric barrier

In this paper, a method of direct synthesis of aluminum nitride nanopowder by dielectric barrier dischargeassisted mechanicalball millingis presented. The mixtures of Al and LiOH·H2O powders, as samples, treated by dielectric barrierdischargeassisted mechanicalball millingare characterized by X-ray diffraction and scanning electron microscope

what particle size range does ball mill grinding produce

Theball millis a key piece of equipment for grinding crushed materials, and it is widely used in production lines for powders such as cement, silicates, refractory material, fertilizer, glass

synthesis of boron nitride nanotubes at low temperatures

Jan 11, 1999· A room-temperatureball-millingtreatment of elemental boron in NH 3 gas is followed by annealing at a relatively low temperature (1000°C). In this method, BN nanotubes over a large range of size can be produced under different conditions. High-energyball millingcan produce structural changes and chemical reactions at room temperature

synthesis of tib2 by electricdischargeassisted

Aug 16, 2007· Titanium powder of particle size <250 μm and minimum purity of 99.9% was mixed with amorphous boron powder of particle size <50 μm (purity 99.8%) to give composition of TiB 2.Before electricdischarge millingexperiments Ti and B powders were pre-mixed for 1 h, under high purity argon in conventional laboratoryball mill

ignition of nanocomposite thermites by electric sparkand

Apr 30, 2014· Insparkignition, a monolayer of powder was placed on a conductive substrate and heated in air by a pulsed electrostaticdischarge. In shock ignition, an individual particle was targeted by a miniature, laser‐driven flyer plate accelerated to a speed in the range of 0.5–2 km s −1

mechanical milling a top down approach for the synthesis

Feb 03, 2012· Synthesis of nanomaterials by a simple, low cost and in high yield has been a great challenge since the very early development of nanoscience. Various bottom and top down approaches have been developed so far, for the commercial production of nanomaterials. Among all top down approaches, high energyball milling, has been widely exploited for the synthesis of various …

milling (machining) an overview sciencedirect topics

Aarati Panchbhai, in Applications of Nanocomposite Materials in Dentistry, 2019. 12.1.1 Top-down approach. In the top-down approach, particles are synthesized in the conventional manner, and are made smaller by grinding ormilling, machining, and lithography; these are mostly the extensions of methods already employed in small-scale assembly at the micron scale

high di electric constant nano structure ceramics

Chowdhury,A., Calka, A., Wexler, D. & Konstantinov, K. K. (2014). High di-electric constant nano-structure ceramics synthesis using novel electricdischargeassisted mechanicalmillingand magnetoball millingand its properties. International Journal of Nanotechnology, 11 (9/10/11), 728-736

influence ofmilling conditionson the hydriding

Mg75 at.%, CB25 at.% (CB: carbon black) composites were synthesized at differentball milling conditions(millingenergy,millingduration, and environment) and their hydriding properties were characterized by high-pressure DSC. The SEM observations revealed that the samples consist of 5–15 μ m Mg particles, surrounded and in some cases coated by carbon particles

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