Refinement process and mechanisms of tungsten powder by high energy ball milling

Liang, Yanxiang; Wu, Zefeng; Fu, Engang; Du, Jinlong; Wang, P.P.; Zhao, Yunbiao; Qiu, Y.H.; Hu, Zonghai

doi:10.1016/j.ijrmhm.2017.04.006

Cited by 43 publications

(20 citation statements)

References 34 publications

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“…When the milling speed increases to 500 rpm, Figure 2c shows that the tungsten powder appears in a flake structure in the micron-scale, and large amount of particles are in the nanoscale after 30 h of ball milling. The size of tungsten particles is in the range from the nanoscale to micron-scale with a D 50 of 50 nm, as shown in Reference [29]. The ball-milled tungsten powder is in the fracturing stage [29], and a large amount of nanoscale particles appear.…”

Section: The Effect Of Milling Speedmentioning

confidence: 95%

“…The size of tungsten particles is in the range from the nanoscale to micron-scale with a D 50 of 50 nm, as shown in Reference [29]. The ball-milled tungsten powder is in the fracturing stage [29], and a large amount of nanoscale particles appear. When the milling time increases to 60 h, the micron-scale particles are further refined and disappear gradually, as shown in Figure 2d.…”

Section: The Effect Of Milling Speedmentioning

confidence: 95%

“…When the milling time increases to 60 h, the micron-scale particles are further refined and disappear gradually, as shown in Figure 2d. The D 50 of the tungsten particles is 50 nm, as shown in Reference [29], which gives the particle size distribution.…”

Section: The Effect Of Milling Speedmentioning

confidence: 98%

“…Most particle sizes are in the micron-scale, as shown in Figure 3a, and the D 50 of the tungsten particles is 1050 nm. Few nanoscale particles fall off from the micron-scale particles with a flake structure, which means that the ball-milled tungsten powder is in the squeezing stage [29]. As the milling time increases, the micron-scale particles with the flake structure are further squeezed, and finally the particles are smashed and fractured.…”

Section: The Effect Of Milling Speedmentioning

confidence: 99%

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Effect of Ball Milling Parameters on the Refinement of Tungsten Powder

Liang

et al. 2018

Metals

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The high-energy ball milling method was adopted to explore the influence of ball milling parameters, such as milling speed and additive amounts of process control agent (PCA) on tungsten powder. The morphology and microstructure of tungsten powder in the process of refinement were characterized by field-emission scanning electron microscope (FE-SEM), field-emission transmission electron microscope (FE-TEM), and X-ray diffractometer (XRD). Results revealed that the ball milling process and the refinement of tungsten particle and grain can be largely influenced by these two parameters. The milling efficiency was found to be highest with the milling speed of 700 rpm and additive amounts of 8% PCA. The mechanisms for the effect of these two parameters and milling time on the refinement process were discussed. Nanocrystalline tungsten powder with a particle size and grain size smaller than 100 nm was obtained, and the grain size of 5-15 nm was fabricated successfully under the highest milling efficiency conditions.

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Section: The Effect Of Milling Speedmentioning

confidence: 95%

Section: The Effect Of Milling Speedmentioning

confidence: 95%

Section: The Effect Of Milling Speedmentioning

confidence: 98%

Section: The Effect Of Milling Speedmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Ball Milling Parameters on the Refinement of Tungsten Powder

Liang

et al. 2018

Metals

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“…The beginning of fracture can be attributed to increasing impact energy formed during mechanical milling at the high milling speed of 200 rpm. As known, the morphology of ductile metal particles changes to flake structure during the early stage of milling and those flake particles become both fractured and cold‐welded to each other in the second stage [12–14]. However, brittle ceramic particles do not show flake morphology.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of SiC nanoparticles by central composite design response surface methodology directed mechanical milling

Erdemir

Varol

Çanakçı

2020

Micro & Nano Letters

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In this work, synthesising of SiC nanoparticles by mechanical milling was studied. The influence of ball to powder ratios, milling speeds and milling times in three levels on the specific surface area of SiC particles using central composite design was investigated. The statistical significance of the independent variables and their dual interactions were analysed. The specific surface area and morphology of SiC particles were characterised using a laser particle size analyser and scanning electron microscope, respectively. It was found that milling speed is the most important parameter for the conversion of SiC particles from micro-sized to nanosized powders. The morphology and specific surface area of SiC particles are almost unchanged at the milling speed of 100 rpm. The specific surface area substantially increased from 0.0643 to 3.59 m 2 /g with increasing the milling speed from 100 to 300 rpm.

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