Hybrid Atomization Method for Manufacturing Fine Spherical Metal Powder

2007 ◽  
Vol 534-536 ◽  
pp. 69-72
Author(s):  
Kazumi Minagawa ◽  
Hideki Kakisawa ◽  
Kohmei Halada
Keyword(s):  
Processing Parameters ◽  
Drop Formation ◽  
Gas Atomization ◽  
Centrifugal Atomization ◽  
Formation Mode ◽  
Mean Size ◽  
Powder Characteristics ◽  
Atomization Mechanism ◽  
Zn Alloy ◽  
Normal Hybrid

Hybrid atomization is a new atomization technique that combines gas atomization with centrifugal atomization. This process can produce fine, spherical powders economically with a mean size of about 10 μm diameter and a tight size distribution. Experiments on the process were carried out using a Sn-9 mass% Zn alloy to investigate the influence of processing parameters on powder characteristics in hybrid atomization. The primary atomization mechanism under normal hybrid atomization conditions is predicted to be direct drop formation mode.

Characteristics of SAC305 Lead-Free Powder Prepared by Centrifugal Atomization

2018 ◽  
Vol 777 ◽  
pp. 322-326
Author(s):  
Nipon Denmud ◽  
Thawatchai Plookphol
Keyword(s):  
Size Distribution ◽  
Oxygen Content ◽  
Surface Condition ◽  
Disk Surface ◽  
Processing Parameters ◽  
Production Yield ◽  
Sufficient Time ◽  
Centrifugal Atomization ◽  
Mean Size ◽  
The Mean

Centrifugal atomization apparatus was constructed to produce solder alloy powder with high quality. In this work, SAC305 alloy was atomized to study the effects of processing parameters, including atomizer disk surface condition and oxygen content in the atomizer chamber on the mean particle size, size distribution, production yield, and morphology of the produced SAC305 powder. The results showed that the atomizer disk surface coated with tin alloy gave the produced powder with smaller mean size, narrower size distribution and higher production yield, in comparison with the uncoated disk. This is due to a good wettability between the molten SAC305 and atomizer disk surface and the sufficient time for alloy droplets to be solidified. The shapes of SAC305 powder were sphere, teardrop, oval, and ligament, depending on the oxygen content in the atomizer chamber during atomization. The shape of produced powder was almost perfectly spherical when the oxygen content was decreased down to 0.5 vol.%. Moreover, with decreasing the oxygen content in the atomizer chamber, the produced SAC305 powder would contain oxygen content on its surface lower than 100 ppm.

scholarly journals Inclusions and Microstructure of Steel Weld Deposits with Nanosize Titanium Oxide Addition

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Cuixin Chen ◽  
Haitao Xue ◽  
Huifen Peng ◽  
Liang Yan ◽  
Lei Zhi ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Titanium Oxide ◽  
Molten Pool ◽  
Processing Parameters ◽  
Phase Transformation Temperature ◽  
Columnar Crystal ◽  
Oxide Addition ◽  
Intragranular Ferrite ◽  
Mean Size ◽  
Steel Welds

Nanosize TiO2particles were added directly into welding molten pool through electrode for the difficulty of accurate control of oxygen potential and production processing parameters. The characteristics of phase transformation and thermal behavior of inclusions for Fe-C-Mn-Si-Ti-O system and Fe-C-Mn-Si-TiO2system were analyzed. Results show that the added TiO2particles are more helpful for the formation of Mn-Ti-O complex inclusion and can induce the decrease of phase transformation temperature of austenite to ferrite. Intragranular ferrite can be obtained under the condition of continuous cooling transformation with cooling rate of 293 K/s–373 K/s. The inclusions in steel welds are spherical in shape and mainly composed of TiO2, Ti3O5, Ti2O3, MnO, and SiO2. The mean size of inclusions is 0.67 μm. These complex inclusions can supply a large number of nucleating cores for their precipitation at higher temperature, which will disturb the growth of columnar crystal during solidification. Moreover, Mn-containing titanium oxides will promote the transformation of austenite to intragranular ferrite for the formation of manganese depleted zones in steel welds around oxides. So it can be concluded that nanosize titanium oxide added directly in welding molten pool can be effectively used to control phase transformation and achieve fine and favorable microstructure.

A Preliminary Study on Cell Wall Architecture of Titanium Foams

2009 ◽  
Vol 1188 ◽  
Author(s):  
Nihan Tuncer ◽  
Luc Salvo ◽  
Eric Maire ◽  
Gürsoy Arslan
Keyword(s):  
Weight Ratio ◽  
Cost Savings ◽  
High Strength ◽  
Processing Parameters ◽  
Inert Atmosphere ◽  
Theoretical Density ◽  
Space Holder ◽  
Wide Range ◽  
Powder Characteristics ◽  
Foamed Metals

AbstractBio-inspired architectures, especially metallic foams, have been receiving an increasing interest for the last 10 years due to their unusual mechanical properties. Among commonly dealt foamed metals, like aluminum and steel, titanium possesses a distinctive place because of its high strength-to-weight ratio, excellent corrosion resistance and biocompatibility. In this study, Ti foams were produced by a very simple and common method, sintering under inert atmosphere with fugitive space holder. Removal of the space holder was conducted by dissolution in hot deionized water which makes it possible to minimize contamination of Ti. Sintering of remaining Ti skeleton at 1300 °C offered a wide range of properties and cost savings. The effects of the processing parameters such as sintering temperature and powder characteristics on the 3D foam architecture were investigated by using X-ray microtomography (μ-CT). Use of bimodal Ti powders caused a decrease in final theoretical density when compared to the ones prepared with the same amount of space holder but with monomodal Ti powders. It was also observed that the use of bimodal Ti powders decreased compressive strength, by introducing pores into the cell walls, when compared to the ones having the same theoretical density.

A Research on the Trinity Mechanism of Atomization Based on Centrifugation Oscillation and Impact Breakage

2011 ◽  
Vol 467-469 ◽  
pp. 589-592
Author(s):  
Feng Luo ◽  
Ke Qiu
Keyword(s):  
Energy Efficient ◽  
Low Cost ◽  
Labor Intensity ◽  
Centrifugal Atomization ◽  
Atomization Mechanism ◽  
The Impact ◽  
The Trinity ◽  
Auxiliary Mechanism

The paper advances a new atomization mechanism combining the centrifugal, the oscillating and the impact breakage atomization as a trinity, breaking through the traditionally single atomization model. The atomization mechanism raised here makes full use of the comprehensive effects of the centrifugal atomization, the oscillating atomization and the impact breakage atomization, synthesizing the superiorities of the three as an organic and powerfully efficient whole, and making their mutual reactions stronger step by step. Among the three, the impact breakage atomization is a new auxiliary mechanism, which can considerably improve the droplet’s atomizing process after the centrifugal and the oscillating atomization, producing much better an atomizing result. It is very convenient, simple and direct to fulfill “the-three-in-one”. This atomization mechanism not only can achieve the goal of even atomization and much tinier droplets, but can be energy-efficient with low cost and less labor intensity as well. Therefore it is a highly practical and useful method.

Study of New Atomization Mechanism for Manufacturing Metal Powder

2012 ◽  
Vol 562-564 ◽  
pp. 502-505
Author(s):  
Ke Qiu ◽  
Feng Luo ◽  
Dong Fang Zhao ◽  
Zhong Lei Li ◽  
Jin Peng Sun
Keyword(s):  
Metal Powder ◽  
Energy Efficient ◽  
Low Cost ◽  
Centrifugal Atomization ◽  
Atomization Mechanism ◽  
The Impact ◽  
Auxiliary Mechanism

The paper introduces a new atomization mechanism combining the centrifugal, the oscillating and the impact breakage atomization as a trinity, breaking through the traditional single atomization model. The atomization mechanism here makes full use of the comprehensive effects of the centrifugal atomization, the oscillating atomization and the impact breakage atomization, synthesizing the superiorities of the three as an organic and powerfully efficient whole, and making their mutual reactions stronger step by step. The impact breakage atomization is a new auxiliary mechanism among the three, which can improve the atomizing process of droplets considerably after the centrifugal and the oscillating atomization, producing much better an atomizing result. It is very convenient, simple and direct to fulfill the three-in-one. This atomization mechanism can achieve the goal of even atomization and much tinier droplets and be energy-efficient with low cost as well. Therefore it is a highly practical and useful method.

scholarly journals The Effect of Processing Parameters on the Properties of Fish Gelatin Hydrolysate Nanoparticle

2021 ◽  
Vol 5 (1) ◽  
pp. 17
Author(s):  
Deni Subara ◽  
Irwandi Jaswir
Keyword(s):  
Protein Content ◽  
Economic Value ◽  
Spherical Shape ◽  
Processing Parameters ◽  
Nanoparticle Size ◽  
Absorption Characteristic ◽  
Fish Gelatin ◽  
Acetone Concentration ◽  
Gelatin Hydrolysate ◽  
Mean Size

Fish gelatin hydrolysate is a well- known fish by-product that is high in protein content. It is produced from by-product waste from the fish processing industry, which includes fish skin, head, and bones. Gelatin hydrolysates have recently received much attention due to its high protein content and bioactivity, which includes antioxidant, antimicrobial and antihypertensive activities. The transformation of gelatin hydrolysate into nanoparticles is believed to increase its economic value. Furthermore, reduction into nano-size increases the absorption characteristic of this material. Here, fish gelatin hydrolysate nanoparticles are prepared for the first time using desolvation method. The effects of concentration of gelatin hydrolysate, pH of solution, and acetone concentration on nanoparticle size are determined. The prepared gelatin hydrolysate nanoparticles were found to have spherical shape with sizes varying from 300-400 nm with a mean size of 408 ± 11.4 nm, zeta potential of -16.4 ± 1.2 mV and PDI 0.203 ± 0.07. This study showed that concentration of gelatin hydrolysate, pH and concentration of solvent have significant effects on nanoparticle size. The gelatin hydrolysate nanoparticles can be applied in the pharmaceutical industry for the encapsulation of drugs to facilitate delivery to target sites.

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