Benefits of Mild Wet Milling of the Intermediates for the Synthesis of Phase-pure Z-type Hexaferrite

2005 ◽  
Vol 20 (8) ◽  
pp. 1939-1942 ◽  
Author(s):  
Jadambaa Temuujin ◽  
Masami Aoyama ◽  
Mamoru Senna ◽  
Taisuke Masuko ◽  
Chie Ando ◽  
...  
Keyword(s):  
Particle Size ◽  
Crystallization Rate ◽  
Planetary Mill ◽  
Favorable Effect ◽  
Dry Milling ◽  
Wet Milling ◽  
Diffusion Distance ◽  
Particle Size Reduction ◽  
Phase Pure ◽  
Basic Layer

A comparative study on the wet and dry milling of the intermediates for the Z-type hexagonal ferrite (Ba3Co2Fe24O41, Z phase) was performed. Phase-pure Z phase was synthesized by wet milling the intermediates comprising M and Y-type hexaferrites. The intermediates were obtained by calcining the stoichiometric powder mixture at 1080 °C. Subsequent wet milling by a planetary mill for 1 h increased the crystallization rate of Z phase upon subsequent heating at 1230 °C. In contrast, dry milling the intermediates resulted in the severe surface amorphization and led to heterogeneous crystalline states. The observed favorable effect of wet milling the intermediates was explained by the particle size reduction for the decrease of diffusion distance while preserving the basic layer units common to the related hexaferrites.

Effect of Milling Time and Dispersant on Microstructures of Alpha Alumina Nanopowder Synthesized from Aluminium Dross Waste

2011 ◽  
Vol 364 ◽  
pp. 372-376 ◽  
Author(s):  
Yusoff M.S. Meor ◽  
Muslimin Masliana ◽  
Paulus Wilfred ◽  
E. M. Mahdi ◽  
D. Parimala
Keyword(s):  
Particle Size ◽  
Crystallite Size ◽  
Milling Time ◽  
Xrd Analysis ◽  
Planetary Mill ◽  
Wet Milling ◽  
Particle Size Reduction ◽  
Mean Particle Size ◽  
Peak Broadening ◽  
Aluminium Dross

The paper presents a study on the effect of milling time and addition of SLS dispersant on the crystallite and particle size reduction of α-alumina produced from aluminium dross waste. Wet milling was performed in high velocity planetary mill at speed of 1100 rpm and milled for 2 to 5 hours. XRD analysis shows both peak broadening and shifting occurred especially at longer milling time. The peak broadening effect was then used to calculate both the crystallite size and lattice strain. Samples milled with dispersant gave smaller crystallite size and the smallest crystallite value was 39.4nm obtained using 5 hours milling time. Similarly the mean particle size obtained for samples milled with dispersant gave smaller value and the smaller mean particle size obtained was 0.771 μm after 5 hours of milling.

Ultrasonic Milling and Dispersing Technology for Nano-Particles

2012 ◽  
Vol 1479 ◽  
pp. 21-26 ◽  
Author(s):  
Kathrin Hielscher
Keyword(s):  
Particle Size ◽  
Large Scale ◽  
Size Reduction ◽  
Nano Particles ◽  
Industrial Scale ◽  
Wet Milling ◽  
Particle Size Reduction ◽  
Ultrasonic Milling ◽  
Ultrasonic Parameters

ABSTRACTUltrasonically generated forces are well known for dispersing and deagglomeration of small volumes in laboratory and bench-top scale. By the evaluation and optimization of the most important ultrasonic parameters and the development of large scale ultrasonic machinery, ultrasound forces can be applied also for particle size reduction and wet-milling of nano-particles in industrial scale.

scholarly journals Pengaruh waktu milling terhadap Sifat mikro struktur dan magnet dari NdFeB dengan proses Wet dan Dry milling

2021 ◽  
Vol 9 (1) ◽  
pp. 9-16
Author(s):  
Wahyu Solafide Sipahutar ◽  
◽  
William William ◽  
Muljadi Muljadi ◽  
◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Magnetic Flux ◽  
Time Variation ◽  
Annealing Temperature ◽  
Milling Time ◽  
Dry Milling ◽  
Wet Milling ◽  
Milling Method

Making of magnets from NdFeB flakes by Wet and dry milling to determine the microstructure, physical and magnetic properties of the milling time variation is 16, 24, and 48 hours. The milling powder is then analysed to determine the particle size with PSA and XRD to determine the phase formed. Then the compacting process with isotropy printing for making pellet test samples with a pressure of 7 tons for 2 minutes. Then the pellet sample, given annealing temperature with a variation of 150 and 170 ̊C, then a measurement of magnetic properties with a Gauss Meter. The results obtained by the smallest optimum particle size with 48 hours of milling time at a diameter of 90% 4.7 μm, while the results of dry milling at a diameter of 90% amounted to 60.85 μm. The best method to get the smallest particle size is the Wet milling method. XRD results with Wet and Dry milling phases that appear only Nd2Fe14B phase. As milling time increases, the resulting density increases. The largest magnetic flux testing with dry milling method with 48 hours of milling time for temperatures 170 ̊C temperature obtained 468.5 Gauss and the addition of annealing temperature the magnetic properties of the material is getting better.

Effect of Dispersants on Microstructures of Nano Alpha Alumina Developed from Aluminium Dross Waste

2015 ◽  
Vol 1115 ◽  
pp. 378-381 ◽  
Author(s):  
S. Anis Sofia ◽  
Noorasikin Samat ◽  
Meor Yusoff Meor Sulaiman
Keyword(s):  
Particle Size ◽  
Xrd Analysis ◽  
Planetary Mill ◽  
Wet Milling ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Particle Size Analyzer ◽  
Milling Method ◽  
Aluminium Dross ◽  
Alpha Alumina

This paper compares the effect of dispersants which are Sodium Laureth Sulfate (SLS) and distilled water (DW) on the crystallization, particle size distribution and morphological behavior of nanoalpha Alumina (α-Al2O3) synthesized from Aluminium (Al) dross waste. The synthesizing of nanoα-Al2O3 via wet milling method was performed using a planetary mill for 4 hours at a speed of 550 rpm. The nanoα-Al2O3 powders with dispersants were characterized with x-ray diffraction (XRD), particle size analyzer (PSA) and transmission electron microscopy (TEM). XRD analysis shows the broadening and shifting of peaks after the sample was calcined at 1300 °C, indicating high crystallinity. The crystallite size of α-Al2O3 milled with SLS is also smaller than the α-Al2O3 milled with DW. These results are consistent with the PSA analysis in which the graphs displayed a symmetrical trend. Then, the PSA analysis is validated with TEM observation up to 100000x magnification, particularly for α-Al2O3 milled with SLS.

scholarly journals Elaboration and Characterization of the Nanometric Titanium Diboride Powders by Mechanical Milling Method

2020 ◽  
Vol 31 ◽  
pp. 55-58
Author(s):  
I. Stefan ◽  
G. C. Benga
Keyword(s):  
Particle Size ◽  
Titanium Diboride ◽  
Mechanical Milling ◽  
Structural Evolution ◽  
Planetary Mill ◽  
Distribution Analysis ◽  
Wet Milling ◽  
Research Activities ◽  
Titanium Diboride Powders

The research activities are oriented towards elaborating and characterizing nano-sized powders by powder metallurgy technologies based on wet milling in a planetary mill. For the elaboration of the TiB2 powders, a wet milling regime of initial powders was used up to nano size with the following parameters: milling technology by collision, milling times, rotational speed. The characterization of the TiB2 material will include particle size distribution analysis. EDXS and SEM analysis were used to study the structural evolution of the powder after ball milling. The mechanical milling technology, by its milling regimes, proved to be very efficient, obtaining a reduction of the titanium diboride powders particle size up to 50% compared to the initial unmilled powders.

scholarly journals The Effect of Wet Milling and Cryogenic Milling on the Structure and Physicochemical Properties of Wheat Bran

Foods ◽  
2020 ◽  
Vol 9 (12) ◽  
pp. 1755
Author(s):  
Yamina De Bondt ◽  
Inge Liberloo ◽  
Chiara Roye ◽  
Erich J. Windhab ◽  
Lisa Lamothe ◽  
...  
Keyword(s):  
Particle Size ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Wheat Bran ◽  
Large Scale ◽  
Size Reduction ◽  
Laboratory Scale ◽  
Wet Milling ◽  
Particle Size Reduction ◽  
Cryogenic Milling

Wheat bran consumption is associated with several health benefits, but its incorporation into food products remains low because of sensory and technofunctional issues. Besides, its full beneficial potential is probably not achieved because of its recalcitrant nature and inaccessible structure. Particle size reduction can affect both technofunctional and nutrition-related properties. Therefore, in this study, wet milling and cryogenic milling, two techniques that showed potential for extreme particle size reduction, were used. The effect of the milling techniques, performed on laboratory and large scale, was evaluated on the structure and physicochemical properties of wheat bran. With a median particle size (d50) of 6 µm, the smallest particle size was achieved with cryogenic milling on a laboratory scale. Cryogenic milling on a large scale and wet milling on laboratory and large scale resulted in a particle size reduction to a d50 of 28–38 µm. In the milled samples, the wheat bran structure was broken down, and almost all cells were opened. Wet milling on laboratory and large scale resulted in bran with a more porous structure, a larger surface area and a higher capacity for binding water compared to cryogenic milling on a large scale. The extensive particle size reduction by cryogenic milling on a laboratory scale resulted in wheat bran with the highest surface area and strong water retention capacity. Endogenous enzyme activity and mechanical breakdown during the different milling procedures resulted in different extents of breakdown of starch, sucrose, β-glucan, arabinoxylan and phytate. Therefore, the diverse impact of the milling techniques on the physicochemical properties of wheat bran could be used to target different technofunctional and health-related properties.

The Influence of the Milling Media Environment on the Characteristics of a W-Cu Composite Powder

2008 ◽  
Vol 591-593 ◽  
pp. 154-159 ◽  
Author(s):  
Franciné Alves Costa ◽  
W.M. de Carvalho ◽  
A.G.P. Silva ◽  
Uilame Umbelino Gomes ◽  
José F. Silva ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Composite Powder ◽  
High Energy ◽  
Composite Particles ◽  
Dry Milling ◽  
Wet Milling ◽  
Composite Powders ◽  
Media Environment ◽  
The Mean

W-Cu composite powders were prepared by high energy milling under two milling environments: cyclohexane and air. Composite particles are formed in both cases. The W particles are fragmented and embedded into the Cu particles. Both, W and Cu, are heavily strained, mainly in the first hours of milling. The composite powder has high homogeneity and is much finer than the original Cu powder. The mean particle size of the powders milled in both conditions is very close, but the wet milling was near 25% longer than dry milling and the size distribution is wider. This is consequence of the higher milling intensity of dry milling.

Ball Milling of WC-Co Powder as Injection Molding Feedstock

2011 ◽  
Vol 110-116 ◽  
pp. 1425-1430
Author(s):  
Sri Yulis M. Amin ◽  
Norhamidi Muhamad ◽  
Khairur Rijal Jamaludin ◽  
Abdolali Fayyaza ◽  
Heng Shye Yunn
Keyword(s):  
Particle Size ◽  
Ball Milling ◽  
Particle Morphology ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Elemental Distribution ◽  
Wet Milling ◽  
Particle Size Reduction ◽  
Milling Medium ◽  
Wet Condition

In this paper, an attempt has been made to mill constituent of WC and Co powder towards achieving volumetric percentage of WC (91%) and Co (9%). The ball milling technique was conducted under dry and wet condition using various milling parameters, rotation speed, time and ethanol as milling medium. Electron dispersive spectrometer (EDS) detected the elemental distribution, whilst SEM and particle size analysis was done to study the effect of changes in particle morphology and reduction of particle size. As a conclusion, powder milled by parameter of wet milling by ethanol, speed of rotation at 250 rpm and 90 minutes of milling time exhibits best results in term of volumetric percentage of 91%WC and 9%Co and particle size reduction.

Methods for particle size reduction of liposomal amphotericin B

2018 ◽  
Vol 60 (1) ◽  
pp. 42-45
Author(s):  
Tuan Quang Nguyen ◽  
Van Lam Nguyen ◽  
Thai Son Nguyen ◽  
Thi Minh Hue Pham ◽  
◽  
...  
Keyword(s):  
Particle Size ◽  
Amphotericin B ◽  
Liposomal Amphotericin ◽  
Size Reduction ◽  
Liposomal Amphotericin B ◽  
Particle Size Reduction
Sign in / Sign up

Export Citation Format

Share Document