Effects of process parameters and cooling gas on powder formation during the plasma rotating electrode process

Cui, Yujie; Zhao, Yufan; Numata, Haruko; Yamanaka, Kazushi; Bian, Huakang; Aoyagi, Kazuhiko; Chiba, Akihiko

doi:10.1016/j.powtec.2021.07.062

Cited by 15 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Figure 1 shows the schematic diagrams of the EIGA and PREP systems. The EIGA method uses a tightly coupled nozzle to atomize the molten alloy into fine droplets by a high-pressure airflow, while the PREP method relies on the centrifugal force of the electrode rotating at high speed to crush the molten alloy into fine droplets [ 26 , 27 , 28 ]. The droplets cool down rapidly under an argon atmosphere and eventually form pre-alloyed powders.…”

Section: Methodsmentioning

confidence: 99%

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Gao

Xie

et al. 2023

Materials

View full text Add to dashboard Cite

High-activity spherical TaNbTiZr refractory high-entropy alloy (REHA) powders were successfully prepared by electrode induction melting gas atomization (EIGA) and plasma rotating electrode process (PREP) methods. Both the EIGAed and PREPed TaNbTiZr RHEA powders have a single-phase body-centered cubic (BCC) structure and low oxygen content. Compared with the EIGAed powders, the PREPed powders exhibit higher sphericity and smoother surface, but larger particle size. The average particle sizes of the EIGAed and PREPed powders are 51.8 and 65.9 μm, respectively. In addition, both the coarse EIGAed and PREPed powders have dendritic structure, and the dendrite size of the EIGAed powders is larger than that of the PREPed powders. Theoretical calculation indicates that the cooling rate of the PREPed powders is one order of magnitude higher than that of the EIGAed powders during the solidification process, and the dendritic structure has more time to grow during EIGA, which is the main reason for the coarser dendrite size of the EIGAed powders.

show abstract

Section: Methodsmentioning

confidence: 99%

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Gao

Xie

et al. 2023

Materials

View full text Add to dashboard Cite

show abstract

“…PREP production process [14][15] : After the metal raw material is surface treated, the oxides and impurities are removed and washed and dried, the alloy bar material is melted into the specified size, the alloy bar material is put into the atomization chamber, the atomization chamber is vacuumed, the temperature of the protective gas in the atomization chamber is raised within a certain range, and then the cooling system is started, the pulverizing equipment is turned on, and the plasma gun power supply is started when the alloy bar material is rotated to a certain speed. The high-temperature plasma arc is generated between the alloy bar and the plasma gun, and the tiny droplets generated by the end face of the alloy bar fall into the cooling system and solidify into powder.…”

Section: Plasma Rotating Electrode Processingmentioning

confidence: 99%

Methods for preparing high-quality powder for targets

Ren,

He,

Luo

et al. 2023

J. Phys.: Conf. Ser.

View full text Add to dashboard Cite

Powder metallurgy process can produce excellent quality magnetic targets, in which powder quality affects the quality of the target to a large extent, the production of high-quality target has an important role. This paper mainly introduces the preparation methods of powder for targets, summarizes the preparation methods of fine powder and the characteristics of different preparation methods. Finally, it summarizes the shortcomings of the current research on powder for targets, proposes new research ideas, and prospects its future development.

show abstract

“…However, a challenge arises from the presence of a significant number of satellite powder particles and hollow powder in GA-prepared HEA powders, both adversely impacting print quality. Additionally, MA-prepared HEA powders exhibit low sphericity, necessitating subsequent spheroidization processes to meet the powder requirements for AM. , Although satellite powder can also be produced through PREP preparation, it can be greatly reduced through the sieving and optimization of process parameters. Among these preparation methods, the powder prepared by PREP exhibits advantages such as good sphericity, low oxygen content, a narrower particle size distribution (PSD), and a smooth surface, which meet the basic requirements of raw material powders in SLM .…”

Section: Introductionmentioning

confidence: 99%

Powder Synthesis and Characterization of Al_0.5CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process

Li,

Sui,

Feng

et al. 2024

ACS Omega

View full text Add to dashboard Cite

The Al 0.5 CoCrFeNi high-entropy alloy powder was produced by using a plasma rotating electrode process. The morphology, microstructure, and physical properties of the powder were characterized. The powder exhibited a smooth surface and a narrow particle size distribution with a single peak. The relationships between particle size and secondary dendrite arm space as well as cooling rate were evaluated as follows: λ = 0.0105d + 0.062 and v c = 4.34 × 10 −5 d −2 + 2.62 × 10 −2 d −3/2 , respectively. The Al 0.5 CoCrFeNi powder mainly consisted of fcc + bcc phases. As the powder particle size decreased, the microstructure of the powder changed from dendritic to columnar or equiaxed, along with a decrease in the fcc content and an increase in the bcc content. The tap density (4.76 g cm −3 ), flowability (15.01 s × 50 g −1 ), oxygen content (<300 ppm), and sphericity (>94%) of the powder indicated suitability for additive manufacturing.

show abstract

Effects of process parameters and cooling gas on powder formation during the plasma rotating electrode process

Cited by 15 publications

References 36 publications

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Methods for preparing high-quality powder for targets

Powder Synthesis and Characterization of Al_0.5CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process

Contact Info

Product

Resources

About

Effects of process parameters and cooling gas on powder formation during the plasma rotating electrode process

Cited by 15 publications

References 36 publications

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Preparation and Microstructure of High-Activity Spherical TaNbTiZr Refractory High-Entropy Alloy Powders

Methods for preparing high-quality powder for targets

Powder Synthesis and Characterization of Al0.5CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process

Contact Info

Product

Resources

About

Powder Synthesis and Characterization of Al_0.5CoCrFeNi High-Entropy Alloy for Additive Manufacturing Prepared by the Plasma Rotating Electrode Process