Correlation between milling parameters and microstructure characteristics of nanocrystalline copper powder prepared via a high energy planetary ball mill

Ti50Cu23Ni20Sn7 amorphous alloys powder was prepared by mechanical alloying (MA) in a high-energy planetary ball mill. Milling parameters such as rotational velocity of ball mill, ball to powder weight ratio as well as milling time were throughly investigated. Mechanism of mechanical alloying was throughly discussed.

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Effect of Milling Parameters on the Development of a Nanostructured FCC–TiNb15Mn Alloy via High-Energy Ball Milling

Metals ◽

10.3390/met11081225 ◽

2021 ◽

Vol 11 (8) ◽

pp. 1225

Author(s):

Cristina García-Garrido ◽

Ranier Sepúlveda Sepúlveda Ferrer ◽

Christopher Salvo ◽

Lucía García-Domínguez ◽

Luis Pérez-Pozo ◽

...

Keyword(s):

Mechanical Alloying ◽

Ball Mill ◽

Milling Time ◽

High Energy ◽

Planetary Mill ◽

Nominal Composition ◽

Mechanically Alloyed ◽

Milling Parameters ◽

Energy Ball ◽

Full Conversion

In this work, a blend of Ti, Nb, and Mn powders, with a nominal composition of 15 wt.% of Mn, and balanced Ti and Nb wt.%, was selected to be mechanically alloyed by the following two alternative high-energy milling devices: a vibratory 8000D mixer/mill® and a PM400 Retsch® planetary ball mill. Two ball-to-powder ratio (BPR) conditions (10:1 and 20:1) were applied, to study the evolution of the synthesized phases under each of the two mechanical alloying conditions. The main findings observed include the following: (1) the sequence conversion evolved from raw elements to a transitory bcc-TiNbMn alloy, and subsequently to an fcc-TiNb15Mn alloy, independent of the milling conditions; (2) the total full conversion to the fcc-TiNb15Mn alloy was only reached by the planetary mill at a minimum of 12 h of milling time, for either of the BPR employed; (3) the planetary mill produced a non-negligible Fe contamination from the milling media, when the highest BPR and milling time were applied; and (4) the final fcc-TiNb15Mn alloy synthesized presents a nanocrystalline nature and a partial degree of amorphization.

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THE PHYSIOLOGICAL AND HYGIENIC EVALUATION OF THE OPERATOR’S WORKING CONDITIONS IN THE SYNTHESIS OF CHROMIUM DISILICIDE NANOCRYSTALLINE POWDERS BY HIGH-ENERGETICAL MECHANOACTIVATION METHOD

Health and Ecology Issues ◽

10.51523/2708-6011.2017-14-2-20 ◽

2017 ◽

pp. 89-95

Author(s):

A. P. Yavorovskiy ◽

N. V. Solokha ◽

O. V. Demetskaya ◽

I. M. Andrusishina

Keyword(s):

Mechanical Activation ◽

Technological Process ◽

Working Conditions ◽

Ball Mill ◽

High Energy ◽

Working Environment ◽

Planetary Ball Mill ◽

Emission Spectrometry ◽

Activation Process ◽

Plant Design

Objective: to carry out the physiological and hygienic evaluation of the working conditions of operators producing chromium disilicide nanopowders by high-energetical mechanoactivation method and to develop the preventive recommendations. Material and methods. The object of research was the technological process of producing nanocrystalline chromium disilicide powder within a planetary ball mill. The hygienic assessment of the technological process, technological equipment and psycho-physiologic evaluation of the working environment of the operators were carried out using the generally accepted psychophysiological, hygienic, and chronometer methods of study. The concentration of nanoparticles in the working area was measured using the diffusion aerosol spectrometer DAS-2702 («Aeronanoteh», Russia), the nanopowder particle size was measured by the device Analysette 12 DynaSizer («Fritsch», Germany), the chemical composition of air samples was determined by atomic emission spectrometry with inductively coupled plasma (ICP-AES) using the device «Ortima 2100 DV» («Perkin-Elmer», USA). Results. It was found out for the first time that the mechanical activation process was accompanied by emission of nano-sized chromium into the air of the working area, which had not been detected before the beginning of the work. The total concentration of nanoparticles in the main room was 1.6-1.9 times higher than that in the working area of the planetary ball mill and exceeded the test levels recommended for nanomaterials in European countries. Conclusion. The basic adverse factors in case of producing nanopowder of chromium disilicide by mechanoactivation method are presence of nanoparticles of metals in the workplace air and intensity of work. We have proposed hygienic recommendations which are aimed at improving the plant design for the high-energy mechanical activation in the direction of ensuring tightness, reduction of manual work operations, audible and visual signaling during the technological process.

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Exploratory studies on nanobiocide for wood preservation

Indian Journal of Forestry ◽

10.54207/bsmps1000-2014-l4s8eq ◽

2014 ◽

Vol 37 (1) ◽

pp. 9-16

Author(s):

Aparna Kalawate

Keyword(s):

Zinc Oxide ◽

Copper Oxide ◽

Copper Sulphate ◽

Mechanical Milling ◽

Ball Mill ◽

High Energy ◽

Planetary Ball Mill ◽

Wood Preservation ◽

Bond Quality

Nanotechnology presents a tremendous opportunity to boost the field of wood preservation through implementing modern and unique metal biocides with improved properties. Nano form of Copper oxide, Zinc oxide and Copper sulphate were made by mechanical milling in the high energy planetary ball mill with 450 rpm for 12 hours. Among the three tested nanobiocides Copper sulphate at 0.5% concentration provided protection to the plywood against wood destroying organisms without sacrificing the bond quality of plywood. This is the first report to develop and test the efficacy of nanobiocide against wood destroying organism in India.

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Study of Phase Transformation in TiO2 by High Energy Planetary Ball Mill

Advanced Science Engineering and Medicine ◽

10.1166/asem.2017.1969 ◽

2017 ◽

Vol 9 (2) ◽

pp. 144-147

Author(s):

B. B. Tripathy ◽

H. Rath ◽

P. Mallick ◽

N. C. Mishra

Keyword(s):

Phase Transformation ◽

Ball Mill ◽

High Energy ◽

Planetary Ball Mill

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Mechanochemical destruction of DDTs with Fe-Zn bimetal in a high-energy planetary ball mill

Journal of Hazardous Materials ◽

10.1016/j.jhazmat.2017.08.025 ◽

2018 ◽

Vol 342 ◽

pp. 201-209 ◽

Cited By ~ 12

Author(s):

Hong Sui ◽

Yuzhou Rong ◽

Jing Song ◽

Dongge Zhang ◽

Haibo Li ◽

...

Keyword(s):

Ball Mill ◽

High Energy ◽

Planetary Ball Mill

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Formation of Al-Ti-B Phases for Grain Refinement of Al Alloys Produced by High Energy Ball Milling

Materials Science Forum ◽

10.4028/www.scientific.net/msf.907.188 ◽

2017 ◽

Vol 907 ◽

pp. 188-192

Author(s):

Mesut Arikoğlu ◽

Fatih Apaydın ◽

Ali Özer

Keyword(s):

Grain Refinement ◽

Ball Mill ◽

High Energy ◽

Al Alloys ◽

Planetary Ball Mill ◽

Al Alloy ◽

Elemental Distribution ◽

Distribution Analysis ◽

Alloy Series ◽

Grain Formation

In this experimental study, Al-Ti-B powders were ground in planetary ball mill to produce AlxTiyBz where x, y and z stands for the relative molar ratios of elements for the compilation of grain refiner compound. Powder size distribution, phase formation (XRD) and particle morphology was investigated by means of SEM and XRD. The fabrication of AlTiB phases and the grain refinement of Al alloys by adding this phase were aimed. For this purpose, the powders were fed to planetary ball mill to be milled at a speed of 600 rpm. The powders were also milled at different milling times as 30 min and 150 min either in metallic form or compound form of Al, Ti and B powders. The powders were dried after each milling to be characterized by SEM and XRD. The phases and morphology-elemental analysis were also conducted by XRD and SEM, respectively. Moreover, the powders were added to Al alloy castings avoiding the breaking through alloy series which are mainly used in aluminum industry. The Al alloy series were examined for grain refinement by Brinell hardness and optical microscopy for mechanical properties and grain formation as well as by SEM (EDS) for grain formation, morphology and elemental distribution analysis.

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