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Open access

T. Tański, W. Pakieła, D. Janicki, B. Tomiczek and M. Król

Materials 55, (3) 623-629, (2010) [16] L.A. Dobrzański, K. Labisz, E. Jonda, A. Klimpel, J Mater Process Tech. 191, (1-3), 321-325 (2007). [17] M. Bonek, G. Matula, L.A. Dobrzanski, Advanced Materials Research 291-294, 1365-1368 (2011). light metal alloys and polycrystalline silicon, in: J. Lawrence, D. Waugh (Ed.), Laser Surface Engineering. Processes and Applications, Cambridge Woodhead Publishing (2015).

Open access

S.M. Kahar, C.H. Voon, C.C. Lee, U. Hashim, M.K. Md Arshad, B.Y. Lim, S.C.B. Gopinath and W. Rahman

1 Introduction Silicon carbide (SiC) is one of the most popular ceramics used in the industry. It has unique characteristics such as high melting point, excellent oxidation resistance, high chemical inertness, high-thermal conductivity, good microwave absorbing ability, wide energy band gap and high mechanical strength enabling SiC to be used widely in aerospace structures, biomaterials and high temperature semiconducting devices [ 1 – 6 ]. SiC is produced mainly in industry by Acheson process. This process named after its inventor Edward Goodrich Acheson

Open access

Szymon Piasecki, Robert Szmurlo and Marek Jasinski

Abstract

Power electronic circuits, in particular AC-DC converters are complex systems, many different parameters and objectives have to be taken into account during the design process. Implementation of Multi-Objective Optimization (MOO) seems to be attractive idea, which used as designer supporting tool gives possibility for better analysis of the designed system. This paper presents a short introduction to the MOO applied in the field of power electronics. Short introduction to the subject is given in section I. Then, optimization process and its elements are briefly described in section II. Design procedure with proposed optimization parameters and performance indices for AC-DC Grid Connected Converter (GCC) interfacing distributed systems is introduced in section III. Some preliminary optimization results, achieved on the basis of analytical and simulation study, are shown at each stage of designing process. Described optimization parameters and performance indices are part of developed global optimization method dedicated for ACDC GCC introduced in section IV. Described optimization method is under development and only short introduction and basic assumptions are presented. In section V laboratory prototype of high efficient and compact 14 kVA AC-DC converter is introduced. The converter is elaborated based on performed designing and optimization procedure with the use of silicon carbide (SiC) power semiconductors. Finally, the paper is summarized and concluded in section VI. In presented work theoretical research are conducted in parallel with laboratory prototyping e.g. all theoretical ideas are verified in laboratory using modern DSP microcontrollers and prototypes of the ACDC GCC.

Open access

C. F. John, R. C. Paul, S. C. E. Singh and T. Ramkumar

). [8] H. Ahlatci, T. Kocer, E. Candan, and H. Cimenoglu, “Wear behaviour of Al/(Al2O3p+SiCp) hybrid composites”, Tribology International 39 (3), 213-220 (2006). [9] G. Abouelmagd, “Hot deformation and wear resistance of P/M aluminium metal matrix composites”, Journal of Materials Processing Technology 155-156, 1395-1401 (2004). [10] T. Rajmohan, K. Palanikumar, and S. Arumugam, “Synthesis and characterization of sintered hybrid aluminium matrix composites reinforced with nano copper oxide particles and micro silicon carbide particles

Open access

B. Lipowska, B. Psiuk, M. Cholewa and Ł. Kozakiewicz

. (2006). Fabrication of Al2O3-Al composites by infiltration method and their characteristic. Journal of Materials Processing Technology. 175, 266-270. DOI: 10.1016/j.jmatprotec.2005.04.046. [10] Rödel, J. (2002). Mechanical properties of metal-ceramic composites: Model microstructures, macroscopically homogenous and graded material. Anales de Macánica del la Fractura. 19, 13-22. [11] Olejniczak, J., Wiśniewski, P., Ciupiński, Ł., Tarnowski, M., Grabian, J. & Mizera, J. (2012). The investigations on obtaining aluminium-silicon carbide

Open access

Sebastian Skoczypiec, Magdalena Machno and Wojciech Bizoń

., Ravasio C., Process performance of micro-EDM drilling of stainless steel, The International Journal of AdvancedManufacturing Technology, 72, 9-12, 1287-1298, 2014. [15] Jahan M.P., Rahman M., Wongb Y.S., A review on the conventional and micro-electrodischarge machining of tungsten carbide, International Journal of Machine Tools & Manufacture, 51, 837-858, 2011. [16] Clijsters S., Liu K., Reynaerts D., Lauwers B., EDM technology and strategy development for the manufacturing of complex parts in SiSiC, Journal of Materials Processing

Open access

G.-S. Ham, S.-H. Kim, J.-Y. Park and K.-A. Lee

Abstract

This study investigated the high temperature oxidation property of SiC coated layer fabricated by aerosol deposition process. SiC coated layer could be successfully manufactured by using pure SiC powders and aerosol deposition on the Zr based alloy in an optimal process condition. The thickness of manufactured SiC coated layer was measured about 5 μm, and coating layer represented high density structure. SiC coated layer consisted of α-SiC and β-SiC phases, the same as the initial powder. The initial powder was shown to have been crushed to the extent and was deposited in the form of extremely fine particles. To examine the high temperature oxidation properties, oxidized weight gain was obtained for one hour at 1000°C by using TGA. The SiC coated layer showed superior oxidation resistance property than that of Zr alloy (substrate). The high temperature oxidation mechanism of SiC coated layer on Zr alloy was suggested. And then, the application of aerosol deposited SiC coated layer was also discussed.

Open access

Jacek Rąbkowski and Rafał Kopacz

Abstract

This paper presents a new concept for a power electronic converter - the extended T-type (eT) inverter, which is a combination of a three-phase inverter and a three-level direct current (dc)/dc converter. The novel converter shows better performance than a comparable system composed of two converters: a T-type inverter and a boost converter. At first, the three-level dc/dc converter is able to boost the input voltage but also affects the neutral point potential. The operation principles of the eT inverter are explained and a simulation study of the SiC-based 6 kVA system is presented in this paper. Presented results show a serious reduction of the DC-link capacitors and the input inductor. Furthermore, suitable SiC power semiconductor devices are selected and power losses are estimated using Saber software in reference to a comparative T-type inverter. According to the simulations, the 50 kHz/6 kVA inverter feed from the low voltage (250 V) shows <2.5% of power losses in the suggested SiC metal oxide-semiconductor field-effect transistors (MOSFETs) and Schottky diodes. Finally, a 6 kVA laboratory model was designed, built and tested. Conducted measurements show that despite low capacitance (2 × 30 μF/450 V), the neutral point potential is balanced, and the observed efficiency of the inverter is around 96%.

Open access

A. Vaško

Abstract

Three melts of ferrite-pearlitic nodular cast iron with different charge composition were used for fatigue tests. Wöhler fatigue curves and fatigue strength were obtained, and microstructure and fracture surfaces were investigated. The aim of the paper is to determine the influence of charge composition on microstructure, mechanical and fatigue properties of synthetic nodular cast irons and their micromechanisms of failure. Fatigue tests were realised at low frequency sinusoidal cyclic push-pull loading (stress ratio R = −1) at ambient temperature (T = 20 ±5°C). They were carried out with using the fatigue experimental machine Zwick/Roell Amsler 150HFP 5100 at frequency f ≈ 120 Hz. The results of fatigue tests at low frequency cyclic loading are compared with fatigue properties at high frequency cyclic loading.

Open access

M.A. Malika, K. Majchrzak and K.N. Braszczyńska-Malik

Silicon Carbide Processing and Applications, Artech House, Boston. [32] Atanassov, A. & Baleva, M. (2007). Thin Solid Films. 515(5), 3046-3051. [33] Braszczyńska, K.N. Charakterystyka kompozytu na osnowie stopu magnezu umacnianego cząstkami węglika krzemu, PhD thesis (in Polish)