Synthesis and Characterization of Agglomerated Coarse Al Powders Comprising Nanoparticles by Low Energy Ball Milling Process

Abstract

Agglomerated coarse Al powders consisting of nanoparticles were synthesized by low energy ball milling process, and subsequently their structures were characterized in terms of agglomeration size, shape, and porosity depending on various milling time, ball size, and ball to powder weight ratio in order to optimize the process parameters. A higher milling time caused a decrease in the agglomeration size and their shape tends to become spherical while reducing the pore sizes. The agglomeration size was also reduced as the ball to powder weight ratio increased and the ball size decreased. The partial cold welding of the nanoparticles at lower milling time and fully cold welding of the nanoparticles at higher milling time were correspondingly responsible to produce larger and smaller agglomerations, respectively.

Robust Micron-Sized Silicon Secondary Particles Anchored by Polyimide as High-Capacity, High-Stability Li-Ion Battery Anode

“…After that, cold welding and re-welding become predominant, leading to the formation of secondary particles, as illustrated in Figure S1e. The secondary particle size grows with increasing ball-mill time, as illustrated in Figure S1f. − The SEM images reveal that the secondary particles of the SiSPC have a size of about 3–10 μm, similar to that of the bulk material (Figure b). The primary particles are between 100 and 200 nm in size (Figure d), larger than typical commercial nano-Si (n-Si) materials of about 100 nm in size (Figure S2b).…”

Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders

“…So far, many works were carried out for the milling of micron and Aluminum composite powders, however the effect of powder size (nano and micron) and the milling energy (pulverization energy) on the morphology and microstructure of Al-powders are very rare and interesting. Recently, our previous work, carried out by Al-nano particles were synthesized using low energy ball milling process, and the effects of various processing parameters on the resultant porosity and microstructure were investigated [14]. However, studies related to influence of powder size and the milling energy on the morphology and microstructural changes of the aluminum powders have not been well studied.…”

Preparation of Nano Aluminium Powder (NAP) using a Thermal Plasma: Process Development and Characterization

“…Various techniques are used to prepare NAP and these are divided into high temperature and low temperature processes. The high temperature techniques include gas evaporation [13][14][15][16], plasma chemical synthesis [17][18][19][20][21][22], laser ablation [23], arc discharge [24][25][26], electro-explosion [27][28][29][30], and ion implantation [31], whereas the low temperature techniques include solution methods [32][33][34][35][36][37][38] and mechanical attrition (ball milling) [39][40]. However, producing bulk NAP continues to be a technical challenge.…”