Applied sciences

Archives of Metallurgy and Materials

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Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4

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Abstract

Sodium-ion batteries (SIBs) have attracted substantial interest as an alternative to lithium-ion batteries because of the low cost. There have been many studies on the development of new anode materials that could react with sodium by conversion mechanism. SnO2 is a promising candidate due to its low cost and high theoretical capacity. However, SnO2 has the same problem as other anodes during the conversion reaction, i.e., the volume of the anode repeatedly expands and contracts by cycling. Herein, anode is composed of carbon nanofiber embedded with SnO2 nanopowder. The resultant electrode showed improvement of cyclability. The optimized SnO2 electrode showed high capacity of 1275 mAh g–1 at a current density of 50 mA g–1. The high conductivity of the optimized electrode resulted in superior electrochemical performance.
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Authors and Affiliations

Huihun Kim
1
ORCID: ORCID
Milan K. Sadan
1
ORCID: ORCID
Changhyeon Kim
1
ORCID: ORCID
Ga-In Choi
2
ORCID: ORCID
Minjun Seong
2
ORCID: ORCID
Kwon-Koo Cho
2
ORCID: ORCID
Ki-Won Kim
2
ORCID: ORCID
Jou-Hyeon Ahn
2
ORCID: ORCID
Hyo-Jun Ahn
1
ORCID: ORCID

  1. Gyeongsang National University, Research Institute for Green Energy Convergence Technology, Jinju, 52828, Republic of Korea
  2. Gyeongsang National University, Department of Materials Engineering and Convergence Technology, RIGET, Jinju, 52828, Republic of Korea
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Abstract

In this study, high-purity tantalum metal powder was manufactured via self-propagating high-temperature synthesis. During the process, Ta2O5 and Mg were used as the raw material powder and the reducing agent, respectively, and given that combustion rate and reaction temperature are important factors that influence the success of this process, these factors were controlled by adding an excessive mass of the reducing agent (Mg) i.e., above the chemical equivalent, rather than by using a separate diluent. It was confirmed that Ta metal powder manufactured after the process was ultimately manufactured 99.98% high purity Ta metal powder with 0.5 µm particle size. Thus, it was observed that adding the reducing reagent in excess favored the manufacture of high-purity Ta powder that can be applied in capacitors.
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Authors and Affiliations

Yong-Kwan Lee
1 2
ORCID: ORCID
Jae-Jin Sim
1 2
ORCID: ORCID
Jong-Soo Byeon
1 2
ORCID: ORCID
Yong-Tak Lee
1 2
ORCID: ORCID
Yeong-Woo Cho
1 2
ORCID: ORCID
Hyun-Chul Kim
1 3
Sung-Gue Heo
1 3
ORCID: ORCID
Kee-Ahn Lee
2
ORCID: ORCID
Seok-Jun Seo
1
ORCID: ORCID
Kyoung-Tae Park
1
ORCID: ORCID

  1. Korea Institute for Rare Metals, Korea Institute of Industrial Technology, 7-50 Songdo-dong Yeonsoo-gu, Incheon 21999, Korea
  2. Inha University, Department of Advanced Materials Engineering, Incheon 22212, Korea
  3. Korea University, 145, Anam-ro, Seongbuk-gu, Seoul, Republic of Korea
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Abstract

A356 Al composites reinforced by short carbon fiber were prepared through the 2-step process: fabrication of a composite precursor and ultrasonication of the precursor melt. The short carbon fibers were coated with 0.15~1.5 μm thick SiC layer by a carbothermal reaction, and an amount of the carbon fiber reinforcement was determined to be 1.5 vol.% and 4.0 vol.%, respectively. The addition of the carbon fiber increased the hardness of A356 alloy. However, tensile strength did not increase in the as-cast composites regardless of the SiC coating and volume fraction of the carbon fiber, due to the debonding which reduced load transfer efficiency from matrix to fiber at the interface. After T6-treatment of the composites, a significant increase in strength occurred only in the composite reinforced by the SiC-coated short carbon fiber, which was considered to result from the formation of a precipitate improving the Al/SiC interfacial strength
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Authors and Affiliations

Jin Man Jang
1
ORCID: ORCID
Se-Hyun Ko
1
ORCID: ORCID
Wonsik Lee
1
ORCID: ORCID

  1. Advanced Materials and Process R&D Department, Korea Institute of Industrial Technology, Incheon 21999, Republic of Korea
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Abstract

Dissolution of Si in Al-5 mass%Mg alloy melt by the reduction of SiO2 and its effect on microstructure formation of the alloy after solidification were investigated. Al-5 mass%Mg alloy without silica powder had approximately 0.05 mass%Si as an impurity. No significant difference in Si content was observed after the reaction with silica for 10 min, while the Si content increased up to about 0.12 mass% after 30 min. From the microstructure analysis and calculation of Scheil-Gulliver cooling, it was considered that as-cast microstructures of Al-5 mass%Mg-1 mass% SiO2 alloys had the distribution of eutectic phase particles, which are comprised of β-Al3Mg2 and Mg2Si phases. Based on the phase diagrams, only limited amount of Mg can be selectively removed by silica depending on the ratio of Si and Mg. Addition of silica of more than approximately 1.5 mass% in Al-5 mass%Mg alloy led to the formation of spinel and removal of both Mg and Al from the melt.
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Authors and Affiliations

Sun-Ki Kim
1
ORCID: ORCID
Seong-Ho Ha
2
ORCID: ORCID
Bong-Hwan Kim
2
ORCID: ORCID
Young-Ok Yoon
2
ORCID: ORCID
Hyun-Kyu Lim
2
ORCID: ORCID
Shae K. Kim
2
ORCID: ORCID
Young-Jig Kim
1
ORCID: ORCID

  1. Sungkyunkwan University, School of Advanced Materials Science and Engineering, Suwon 16419, Republic of Korea
  2. Korea Institute of Industrial Technology (KITECH), Advanced Materials and Process R&D Department, Incheon 21999, Republic of Korea
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