Effect of Atomization Parameters on Size and Morphology of Al-17Si Alloy Powder Produced by Free Fall Atomizer

Goudar, Dayanand M.; Srivastava, V. C.; Rudrakshi, G.B.

doi:10.4186/ej.2017.21.1.155

Cited by 17 publications

(3 citation statements)

References 9 publications

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“…The powder characteristics, such as the particle size distribution and yield ratio, produced by GA are influenced by several parameters, such as the atomizing gas pressure, melt superheat, and the gas-to-metal ratio (G/M) [112]. It is found that the increase in air pressure, melt superheat and G/M decrease the median particle size, and increase the sphericity for the Al-17Si alloy powders [113]. Martin et al [114] showed that increasing atomizing gas pressure substantially improves the yield ratio of particles with sizes smaller than 150 µm.…”

Section: Gamentioning

confidence: 99%

Characterization, preparation, and reuse of metallic powders for laser powder bed fusion: a review

Sun,

Chen,

Liu

et al. 2023

Int. J. Extrem. Manuf.

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Laser powder bed fusion (L-PBF) has attracted significant attention since its inception, providing unprecedented advantages to fabricate metallic components with complex geometry. The quality and performance of as-printed alloys is an intricate function consisting of numerous factors linking the feedstock powders, manufacturing, and post-treatment. As the starting materials, powders play a critical role in influencing the printing consistency, total fabrication cost, and mechanical properties. In consideration of its importance for L-PBF, the present review aims to review the recent progress on metallic powders for L-PBF focusing on powder characterization, powder fabrication, and powder reuse. The methods of powder characterization and fabrication were presented in the beginning by analyzing the principles and corresponding advantages and limitations. Subsequently, the effect of powder reuse on the powder characteristics and mechanical performance of L-PBF parts is analyzed focusing on steels, nickel-based superalloys, Ti and Ti alloys, and Al alloys. The evolution trend of powders and as-printed parts varies for different alloy systems based on the existing studies, which makes the proposal of a unified reuse protocol infeasible. Finally, perspectives are presented to cater to the increasing applications of AM technologies for future investigations. The present state-of-the-art work can pave the way for the broad industrial applications of L-PBF by enhancing printing consistency and reducing the total cost from the perspective of powders.

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Section: Gamentioning

confidence: 99%

Characterization, preparation, and reuse of metallic powders for laser powder bed fusion: a review

Sun,

Chen,

Liu

et al. 2023

Int. J. Extrem. Manuf.

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show abstract

“…We could also observe the effect of black spots, spherical imperfections since we found coaks or craccks on several parts of the powder surface. Coaks or cracks on the surface could have occured as a result of melt disintegration mechanisms during the gas atomization process [14] that had not formed the perfect spherical droplets completely; however, it collided first with other particles that had been solidified and hit the surface of the atomizer device and then it was cooled down after meeting the water at the bottom of the atomizer. This thing also made a number of coarse powders attached to small powders on the surface.…”

Section: Fig 5 Graph Of the Effect Of Melt Flow Rate On Powder Morpho...mentioning

confidence: 99%

Designs and Evaluations of a Gas Atomizer to Fabricate Stainless Steel Metal Powder to Be Applied at a Metal Injection Molding

Supriadi

Susimah

Akbar

et al. 2020

KEM

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Metal Injection Molding (MIM) is an application of Powder Metallurgy (PM) and Plastic Injection Molding currently being developed to produce precisely-small components. Most of the metal applications using PM are stainless steel fabricated by a gas atomizer. In this study, an atomizer is designed and fabricated to produce stainless steel powder by using a free fall gas atomization method. The stainless steel used in this study is AISI 304 atomized with the diameter sizes varying from about 3 mm, 5 mm, and 7 mm. The variables of diameter size results are the lowest melt flow rate produces the smallest mean diameter, but no significant difference on the sphericity of powder morphology. While the gas pressure variation results shows that metal powder with smaller size will be produced more using the high gas pressure. The gas atomizer have successfully produced metal powder with the size <40 μm and have a spherical shape. The well rounded sphericity for melt flowrate 0.41x10-3 m3/min, 1.14 x10-3 m3/min, and 2.24x10-3 m3/min are 60.0%, 36.0%, and 55.2% respectively.

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“…Among them, carbon coating refers to coating a layer of carbon shell on the surface of nano-aluminum particles to form a core-shell structure of carbon-coated aluminum. The most direct role of the carbon shell on the surface of nano-aluminum powder is to isolate the contact between core aluminum and outside air to maintain Activity of nano-aluminum powder [9][10]. In addition, the carbon layer can burn quickly under high heat conditions, and the core aluminum is exposed to the high heat environment for combustion.…”

Section: Introductionmentioning

confidence: 99%

Properties of Nano-Aluminum Powder Composite Phase Change Energy Storage Materials

2020

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Nano-aluminum powder has the advantages of fast burning rate, high combustion efficiency, complete combustion and no agglomeration and agglomeration during the combustion process. As a metal additive for solid propellants, it can significantly increase its specific impulse, reduce pressure index and characteristic signals. However, due to its large specific surface area and high specific surface energy, nano-aluminum powder is prone to oxidation and even spontaneous combustion. Phase change energy storage materials can absorb or release a large amount of heat during the phase change process, can solve the problem of energy supply and demand mismatch in time or space, and achieve the effect of temperature control and energy storage. Based on the above background, the research content of this article is the performance research of nano-aluminum powder composite phase change energy storage materials. In order to be able to prepare nano-aluminum powder with appropriate particle size by DC arc hydrogen plasma method, the cathode current and inert gas pressure are explored. The effects of other process parameters on the yield and particle size of nano-aluminum powder were analyzed, and the effect mechanism was analyzed. Finally, through experimental simulation, the results show that the nano-aluminum powder begins to oxidize at about 520 ° C, which is 500 ° C lower than the micro-aluminum powder's oxidation temperature at 1000 ° C, which indicates that the nano-aluminum powder has a low oxidation activation energy, which may be related to Nano-aluminum powder is related to the release of additional energy storage.

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Effect of Atomization Parameters on Size and Morphology of Al-17Si Alloy Powder Produced by Free Fall Atomizer

Cited by 17 publications

References 9 publications

Characterization, preparation, and reuse of metallic powders for laser powder bed fusion: a review

Characterization, preparation, and reuse of metallic powders for laser powder bed fusion: a review

Designs and Evaluations of a Gas Atomizer to Fabricate Stainless Steel Metal Powder to Be Applied at a Metal Injection Molding

Properties of Nano-Aluminum Powder Composite Phase Change Energy Storage Materials

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