Wyniki wyszukiwania - BazTech

1

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

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

Archives of Metallurgy and Materials

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2021

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Vol. 66, iss. 4

931--934

EN

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.

2

Investigations of Electro-Discharge Mechanical Machining of Manganese Cast Steels

Młynarczyk P. S., Spadło S.

Archives of Foundry Engineering

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2020

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Vol. 20, iss. 2

95--100

EN

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.

3

Investigation of the surface quality alloying with the electrodes of chromium-nickel steel

Spadło S., Młynarczyk P.

Structure and Environment

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2012

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Vol. 4, no. 2

52--59

EN

The paper presents a brief study of electro-discharge mechanical machining with an elastic, discrete electrode. The factors causing the chemical composition and surface roughness of superficial layer have also been taken into consideration. Attention has also been given to the relation between the material of electrode and the superficial layer composition. The superficial layer obtained by BEDMM consist of several layers. At the top, a molten and resolidified laver, called recast layer, is observed. This layer is usually present because material removal in BEDMM is mainly based on melting process of the workpiece material. In the recast layer in machining condition the mixing and diffusion of the material hot electrode and the workpart can occur.

4

The analysis of brushing tool characteristics

Spadło S.

Archives of Civil and Mechanical Engineering

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2004

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Vol. 4, no 4

27-40

PL

Przedstawiono analityczne rozwiązanie zagadnienia sił, z jakimi oddziaływują pojedyncze włókna szczotki obrotowej z powierzchnią. Przeprowadzono analizę deformacji pojedynczych drucików szczotki, uwzględniając występujące więzy kinematyczne dla przypadku powierzchni płaskiej niepodatnej z występowaniem tarcia. Przedstawiono wyniki symulacji komputerowych w postaci zależności sił oddziaływań drucików z powierzchnią w funkcji kąta obrotu szczotki.

EN

In this paper, an analytical procedure is developed in order to evaluate the filament loading of a circular brush. Filament deformation is computed based on the mechanic analysis in conjunction with kinematic constraints for a rigid flat surface with friction taken into account Numerical results which reveal the relationship between rotation angle and force distribution are reported.

5

Experimental investigations of the brush electro-discharge mechanical machining process - BEDMM.

Spadło Sławomir

Advances in Manufacturing Science and Technology

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2001

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Vol. 25, nr 3

117-135

EN

The electrical discharge mechanical machining process has been used for more than 50 years. A new type of this method, which employs the tool-electrode in the form of rotating brush consisting of wires, employed for removing material, has been presented. The electrode is elastically pressed against the machined surface. This modyfied machining method offers the following possibilities machining of surface of complex shapes, high productivity, ease of process automation. Attention has been given to the relation between the material removal rate and machining conditions. The factors causing the surface roughness and chemical composition of the superficial layer have also been taken into consideration.

PL

Procesy obróbki wykorzystujące oddziaływania elektroerozyjno-mechaniczne są stosowane od ponad 50 lat. Zastosowano nowy rodzaj opisywanej metody, stosowanej w obróbce ubytkowej, z wykorzystaniem szczotki obrotowej jako elektrody roboczej. Elektroda w sposób elastyczny wywiera nacisk na obrabianą powierzchnię. Opisywana metoda umożliwia obróbkę powierzchni o złożonych kształtach, dużą wydajność oraz prostą możliwość automatyzacji. Zwrócono uwagę na zależność wydajności od warunków procesu. Ponadto omówiono czynniki wpływające na chropowatość powierzchni i skład chemiczny warstwy wierzchniej.