Advancement of In-Flight Alumina Powder Spheroidization Process with Water Droplet Injection Using a Small Power DC-RF Hybrid Plasma Flow System

Jang, Juyong; Takana, Hidemasa; Nishiyama, Hideya

doi:10.1007/s11666-012-9751-4

Cited by 5 publications

(3 citation statements)

References 25 publications

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“…This type of method is usually applied to some endothermic reaction applications (such as fuel reforming), and its efficiency is usually about 50% (the efficiency is defined as the ratio of the reaction enthalpy and actual energy expenses). Kawajiri et al [20] proposed the concept of a DC-RF (direct-current-radiofrequency) hybrid plasma torch, and then Takana et al [21], Nishiyama et al [22], Seo et al [23] and Jiang et al [24] explored the effect of DC-RF on the preparation of nanosecond materials from the perspectives of experiment, theory and simulation. The researchers discussed the magnitude of the spheroidization rate (a comprehensive indicator of the degree of spheroidization of all particles within a specified field of view), but did not account for efficiency improvements.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric pressure pulsed modulated arc discharge plasma

Tang

Zhang

et al. 2023

Plasma Sci. Technol.

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Direct-current (DC) arc plasma has great application value in the field of chemical industry, but it has the problem of low energy efficiency. Facing the requirement for improving the energy efficiency of the arc, this paper proposes a unique method of Pulsed Modulated Arc (PMA). This method uses high-frequency pulses and reduces the arc current to improve the control of electron temperature. The electrical characteristics, optical characteristics and products are tested. The test results show that during the PMA process, all of the experimental results which include voltage, current and light will significantly increase. These results are analyzed from the perspective of functionality, repeatability and energy conversion. The analysis results show that although the PMA method does not show good parameter consistency, it has potential application prospects because it increases the energy conversion rate by 4.5% and 8% from the perspective of light and products respectively.

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Section: Introductionmentioning

confidence: 99%

Atmospheric pressure pulsed modulated arc discharge plasma

Tang

Zhang

et al. 2023

Plasma Sci. Technol.

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Section: Introductionmentioning

confidence: 99%

“…Several experimental studies have been conducted on the plasma spheroidization of alumina powder in the past decade [2,3,[6][7][8]; the focus of most studies is different because of different study backgrounds. For example, Juyong Jang [7] reported the spheroidization of alumina powder by low-power thermal plasma. Although this can effectively reduce high-energy cost, the spheroidization efficiency and the yield of spherical powder significantly reduced due to the relatively low temperature of plasma and a low feed rate.…”

Section: Introductionmentioning

confidence: 99%

A Comparative Study on Radio-Frequency Thermal Plasma Spheroidization for Two Types of Alumina Ceramic Powder

Zhu

Tong

Yang

et al. 2014

AMR

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To obtain high-performance alumina powder for high-tech application, a comparative study was carried out for the spheroidization of two types of alumina powder using radio-frequency argon-oxygen thermal plasma. The morphology, crystallography, and particle size distribution of spheroidized alumina powder were analyzed. The effect of feed rate on the spheroidization efficiency was investigated. The results show that when the powder flow rate was 35 g/min, the spheroidization efficiency reached up to 100%, and the alumina powder had perfect sphericity, while the spheroidization efficiency decreased with increasing powder flow rate. The X-ray diffraction analysis reveals that the spheroidized alumina powder had mixed crystal structures with a stable α phase and a part of metastable phase. The particle size distribution analysis shows that the particle size of the spheroidized alumina powder did not change obviously. These results will help us to better understand the process engineering of the spheroidization of ceramic powder using radio-frequency argon-oxygen thermal plasma, and provide simultaneously technical assistance for industrialization.

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