Acta Metallurgica Slovaca

AMS online

Year 2009

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Year 2009 No 2

Borovský T., Kijac J., Domovec M.

ANALYSIS OF THE SLAG AND METAL INFLUENCE ON THE LIFE OF ELECTRIC ARC FURNACE HEARTH REFRACTORY LINING

No 2 (2009), p. 77-85

mag01.pdf (347 kB)

mag01_eng.txt (2 kB)

Petrík J., Gengeľ P.

THE CAPABILITY OF GREEN SAND MOLD STRENGTH AND MOLD PERMEABILITY MEASUREMENT PROCESS

Keywords: MSA|green sand|permeability|strength|

No 2 (2009), p. 86-92

mag02.pdf (371 kB)

mag02_eng.txt (2 kB)

Buľko B., Kijac J., Domovec M.

OPTIMALIZATION SLAG COMPOSITION IN LADLE FURNACE CONSIDERING TO EFFECTIVE STEEL DESULFURIZATION

Keywords: steel desulfurization|ladle furnace|sulphur distribution coefficient|

No 2 (2009), p. 93-99

mag03.pdf (168 kB)

mag03_eng.txt (2 kB)

Kováčová A., Kvačkaj T.,Kvačkaj M., Donič T., Martikán M., Besterci M.

STRESS-STRAIN CURVES PROGRESS ANALYSE OF UFG Cu DURING DYNAMIC LOADING AND ITS FRACTURE AREAS INVESTIGATION

No 2 (2009), p. 100-104

mag04.pdf (278 kB)

mag04_eng.txt (2 kB)

Ambriško Ľ., Pešek L.

ACCURACY OF STRAIN MEASUREMENT USING ME 46 VIDEOEXTENSOMETRIC SYSTEM

Keywords: strain|videoextensometry|accuracy|

No 2 (2009), p. 105-111

mag05.pdf (347 kB)

mag05_eng.txt (327 B)

Andrejovská J., Mihalik J., Kovaľ V., Bruncková H., Dusza J.

MICROSTRUCTURE AND PROPERTIES OF PB FREE PIEZOELECTRIC CERAMICS ON THE BASE (K0.5 Na0.5)NbO3

Abstract
Because of Lead-based piezoceramic`s environmental issues associated with lead, the development of lead-free piezoceramics has attracted much attention recently. Among various candidates for lead-free piezoelectric materials. ceramics based on potassium sodium niobate (Na0.5K0.5)NbO3, abbreviated as KNN), which are the most promising candidates, because of its moderate piezoelectric and ferroelectric properties as well as its better environmental compatibility. (Na0.5K0.5)NbO3 based piezoelectric ceramics has a perovskite structure. The room temperature phase of AgNbO3 also belongs to the perovskite family and is it closely related to the room-temperature phase (Na0.5K0.5)NbO3. Influence of AgNbO3 (abbreviated as AN) addition into (Na0.5K0.5)NbO3 with different content ((Na0.5K0.5)NbO3, 0.875(Na0.5K0.5)NbO3-0.125AgNbO3, 0.750(Na0.5K0.5)NbO3-0.250AgNbO3) on microstructure and mechanical properties was investigated. Furthermore, in the case of 0.875(Na0.5K0.5)NbO3 - 0.125AgNbO3 influence of 5.5 mol.%LiSbO3 was estimated. It was found that addition of AgNbO3 into (Na0.5K0.5)NbO3 improved the mechanical properties such as microhardness at 10N (from 1.802 ± 0.82GPa to 2.449 ± 0.41 GPa), macrohardness at 50N (from 1.051± 0.37 GPa to 1.550 ± 0.09 GPa), fracture toughness (from 1.445 ± 0.04 MPa.m1/2 to 1.521 ± 0.17 MPa.m1/2) and strength (from 60.127 ± 0.28 MPa to 90.927 ± 0.37 MPa). Addition of the LiSbO3 into 0.875 (Na0.5K0.5)NbO3 - 0.125AgNbO3 has a significantly possitive influence on microhardness values (from 1.717 ± 0.24GPa to 2.495 ± 0.79 GPa) and on macrohardness values (from 1.550 ± 0.09 GPa to 2.413 ± 0.29 GPa), no significantly influence on fracture toughness was observed, but porosity was significantly increased and strength was decreased (from 72.583 ± 0.59 MPa to 71.702 ± 0.52 MPa).

No 2 (2009), p. 112-116

mag06.pdf (505 kB)

mag06_eng.txt (2 kB)

Vaszi ZS. , Varga A.

DESIGN AND VERIFICATION OF THE MATHEMATICAL MODEL FOR DETECTING THE THROUGHPUT OF THE COMPRESSOR STATIONS

Keywords: Compressor station|mathematical model|throughput|compressor set|

No 2 (2009), p. 117-125

mag07.pdf (150 kB)

mag07_eng.txt (2 kB)

Budayová M. , Varga A.

THE RESULTS OF THE MEASUREMENTS BIOMASS GASIFICATION IN A FLUIDIZET BED REAKTOR

Keywords: biomass|gasification|syngas|fluid reaktor|