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Investigations of Electro-Discharge Mechanical Machining of Manganese Cast Steels

P.S. Młynarczyk S. Spadło
Archives of Foundry Engineering | 2020 | vol. 20 | No 2 | 95-100 | DOI: 10.24425/afe.2020.131309
Keywords EDM Flexible electrode Cast steel Machining efficiency Roughness
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Abstract

This paper presents a study of the hybrid electro-discharge mechanical machining BEDMM (Brush Electro-Discharge Mechanical Machining) with the application of a rotary disk brush as a working electrode. The discussed method enables not only an effective machining with a material removal rate of up to 300 mm3/min but also finishing (with the obtained roughness of Ra < 0.5 μm) of the surfaces of complex-shaped alloys with poor machinability. The analysis of the factors involved in the machining process indicates that its efficiency is determined by electrodischarge. The use of flexible working electrodes makes it possible to apply simple technological instrumentation and results in the simplicity of the process automation. The aim of the study was to obtain quantitative relationships between the parameters of brush electro discharge mechanical machining (BEDMM) and its effects. The presented experimental research results define the effect of the process input parameters on the performance and roughness of machined surfaces obtained for manganese cast steel.

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Authors and Affiliations

P.S. Młynarczyk
S. Spadło

Electrochemical Properties of Flexible Anode with SnO2 Nanopowder for Sodium-Ion Batteries

Huihun Kim Milan K. Sadan Changhyeon Kim Ga-In Choi Minjun Seong Kwon-Koo Cho Ki-Won Kim Jou-Hyeon Ahn Hyo-Jun Ahn
Archives of Metallurgy and Materials | 2021 | vol. 66 | No 4 | 931-934 | DOI: 10.24425/amm.2021.136399
Keywords Sodium-ion batteries SnO2 anode Flexible electrode Nano SnO2 particles Ether based electrolyte
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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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