ratory mill for 30 min under a high purity argon at-mosphere. Electric discharge assisted ball milling was performed in a modified vibrational laboratory rod mill. The mill was designed to produce a mill-ing mode that combines repeated impact of a hard-ened curved rod end on powder particles, placed on a vibrating hemispherical container under

The effect of spark energy on particle shape and size produced by discharge milling was studied. Conventional milling in inert atmosphere for extended periods generally leads to the formation of porous powder particle aggregates, each particle comprised of small amorphous or, after extended milling times, nanocrystalline elements

electric discharge assisted mechanical milling and magneto ball milling and its properties Azrin A. Chowdhury University of Wollongong, [email protected] Andrzej Calka University of Wollongong, [email protected] David Wexler University of Wollongong, [email protected] Konstantin Konstantinov University of Wollongong, [email protected]

additional short period of spark-discharge milling. Silicon can be nitrided in ammonia by conventional magneto-ball milling under low-energy shearing conditions to form an amorphous-like pro-duct10. The powder can then be hot-pressed to form monolithic microcrystalline Si 3N 4. However, the more direct route of hot-pressing microcrystalline Si 3N

Dec 01, 2006 The cryogenic milling and milling in conjunction with dielectric barrier discharge plasma (DBDP) have been separately set up. The combined effect of low temperature and plasma on ball milling has been investigated by examining the refinement of particle size and grain size of iron powder using scanning electron microscopy, X-ray diffraction, and small angle X-ray scattering

Apr 01, 2011 In this study, a novel method, termed dielectric-barrier-discharge-plasma (DBDP) assisted ball milling and low-temperature carburization, was used to synthesize WC-Co nanocomposite powder. X-ray diffraction, scanning/transmission electron microscopy, and differential scanning calorimetry were used to characterize the microstructure of powders. Starting from W, Co, and

Jan 05, 2013 In this study, nanostructured Fe powders were synthesized following 10 hours of high-energy ball milling with a superimposed dielectric barrier discharge plasma (DBDP). The mean size of the milled powder was approximately 100 nm with an average grain size of 16.2 nm. The influence of DBDP on the underlying grain refinement mechanisms during ball milling was investigated by

During milling, pulsed discharges are initiated at the tip of the rod, travel through the milling atmosphere and powders, terminating in the base at the centre of the hemispherical milling cell. The power supply unit is custom built specifically for discharge milling, yielding a discharge

Nov 05, 2015 The corrosion resistance and mechanical properties of nanocrystalline aluminium (Al) and Al–20 wt.%Cr alloys, synthesized by high-energy ball milling followed by spark plasma sintering, were investigated.Both alloys exhibited an excellent combination of corrosion resistance and compressive yield strength, which was attributed to the nanocrystalline structure, extended solubility, uniformly

a calka spark discharge ball milling. 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

Rapid synthesis of TiC–Fe3C composite by electric discharge assisted mechanical milling of ilmenite (FeTiO3) with graphitemore. by A. Calka. ABSTRACT Carbo-thermic reduction of ilmenite (FeTiO3) to TiO2 and/or TiC is traditionally carried out by a high temperature annealing treatment at ∼1500 C. In this work, electric discharge assisted mechanical milling (EDAMM) has been... more

A recent developed milling method named as dielectric barrier discharge plasma assisted ball milling (DBDP-milling) was introduced. ... Calka 等 [11~13] 将 ... spark discharge mode (b) glow

Sep 12, 2002 During arc (or spark) discharge milling (above about 0.1 MPa gas pressure), the conduction path is through the balls, the ball–chamber gap and the powder particles to the mill

In contrast to conventional milling, spark discharge milling was found to induce the formation of predominantly sub-micron single particles of amorphous powder. The morphology of individual particles varied from sub-micron irregular shaped particles to remelted particles, depending on selection of vibrational amplitude during discharge

May 06, 2016 Several discharge modes are usually utilized in the milling process, such as spark discharge, glow discharge, and dielectric barrier discharge (DBD). DBD, one of electrodes covered by a dielectric, is a common used method to excite non-thermal plasma, which exhibits unique advantages of high electron energy, high electron density, and high concentration of active species (N, O 3 , N 2 (C)

Sep 01, 2002 Calka, A. & Radlinski, A. P. Universal high performance ball milling device and its application for mechanical alloying. Mater. Sci. Eng. A134, 1350–1353 (1991)