Influence of melt superheat on breakup process of close-coupled gas atomization

Ouyang, Hongwu; Chen, Xin; Huang, Baiyun

doi:10.1016/s1003-6326(07)60209-x

Cited by 25 publications

(12 citation statements)

References 17 publications

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“…As the powders were produced in a laboratory atomization chamber, the number of satellites is smaller than that seen in the literature for powders produced in industrial atomizers with larger atomization chambers 3,12,30 .…”

Section: Powder Morphologymentioning

confidence: 90%

“…This confirms that the predominant parameter to determine the reduction of d50 is the effect of the transfer of kinetic energy from the atomizing gas to the metal flow 17 . Moreover, higher superheat of the liquid metal indicates smaller particle size, attributed to the changes in metal properties 12 .…”

Section: Process Parameters Effect On the Particle Size Distributionmentioning

confidence: 99%

“…Increasing the gas pressure, the gas kinetic energy is also increased which leads to a higher action distance of the gas on the melt stream, increasing the secondary atomization and, thus, reducing the particle size. The liquid metal mass flow rate ( M  ) can be adjusted by some process parameters: melt tip diameter, metallostatic pressure and pressurizing the fusion chamber 6,12 . The tip diameter reduction increases the resistance to metal flow and, consequently, the metal flow decreases.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a Mathematical Model Based on Lubanska Equation to Predict Particle Size for Close-Coupled Gas Atomization of 316L Stainless Steel

2022

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Close-Coupled Gas Atomization (CCGA) is often used to produce spherical metal powders with a wider Particle Size Distribution (PSD) (10 -500 µm) compared to that required by the main Additive Manufacturing processes (10 -105 µm). This work presents an accuracy evaluation of a mathematical model based on the Lubanska equation to predict the d50 for CCGA. Atomization experiments of 316L steel were conducted to evaluate the tip diameter and atomization gas pressure effects on PSD and, the d50 experimental results were used as the reference to the mathematical model evaluation. The mathematical model accuracy could be improved by: (i) considering the backpressure phenomenon for the metal flow rate calculation, since it was an important inaccuracy source; (ii) reviewing the tip diameter effect, which had a lower impact on d50 than that predicted by the Lubanska equation. The atomization gas pressure was the most influential parameter on d50 and d90 and the increase of the gas pressure led to a significant reduction in PSD and, consequently, increased yield.

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Section: Powder Morphologymentioning

confidence: 90%

Section: Process Parameters Effect On the Particle Size Distributionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of a Mathematical Model Based on Lubanska Equation to Predict Particle Size for Close-Coupled Gas Atomization of 316L Stainless Steel

2022

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“…However, FFGA usually produce wide particle‐size distribution of powder in which its powders are not fine enough 34 . Therefore, CCGA is a more efficient method to increase the production yield of fine spherical powder by maximizing gas velocity and density impinging on the stream of molten metal 35 . EIGA was developed to produce oxide‐free powder by ensuring that the droplets are not contaminated by any oxide components or refractory metals during atomization 36 …”

Section: Working Principles Of Atomizationmentioning

confidence: 99%

“…34 Therefore, CCGA is a more efficient method to increase the production yield of fine spherical powder by maximizing gas velocity and density impinging on the stream of molten metal. 35 EIGA was developed to produce oxide-free powder by ensuring that the droplets are not contaminated by any oxide components or refractory metals during atomization. 36 In plasma atomization, the plasma-atomized powders are of higher purity because the liquid metal is not contaminated with other solid metals due to zero interaction before solidification.…”

Section: Comparison Of Major Atomization Techniquesmentioning

confidence: 99%

Atomization of metal and alloy powders: Processes, parameters, and properties

Soong,

Lai,

Kay Lup

2023

AIChE Journal

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Additive manufacturing (AM) has been intensively studied over this decade due to the increasing demand of functional and precise materials in various industries. AM process leverages on the concept of layer by layer deposition or joining of a material at micro‐ or nano‐scale to produce the final products. As such, AM technology is widely used to manufacture products of complex geometries with high precision in a short time. As the quality and the performance of AM manufactured functional products depend on the quality and the cost of the atomized metal or alloy powder used, the use of powders of high size uniformity, high purity, high sphericity, high flowability, low cost, and no trapped gas bubble porosity is necessary. To this end, various metal production technologies were investigated and one of the popular technologies is atomization. This article reviewed the working principles of the various atomization technologies for the production of fine metal and alloy powders. The key atomization conditions discussed in this article include atomization type, material feed rate and temperature, atomizing fluid flow rate, type and temperature, cooling rate, and atomization pressure. In addition, several outlooks on the prospect and the optimization of atomization technologies were also discussed in this article.

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