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1
Content available Effect of Wetting Agent and Carbide Volume Fraction on the Wear Response of Aluminum Matrix Composites Reinforced by WC Nanoparticles and Aluminide Particles
Lekatou A., Gkikas N., Karantzalis A. E., Kaptay G., Gacsi Z., Baumli P., Simon A.
Archives of Metallurgy and Materials
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2017
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Vol. 62, iss. 2B
1235--1242
EN
Aluminum matrix composites were prepared by adding submicron sized WC particles into a melt of Al 1050 under mechanical stirring, with the scope to determine: (a) the most appropriate salt flux amongst KBF4 , K2 TiF6 , K3 AlF6 and Na3 AlF6 for optimum particle wetting and distribution and (b) the maximum carbide volume fraction (CVF) for optimum response to sliding wear. The nature of the wetting agent notably affected particle incorporation, with K2 TiF6 providing the greatest particle insertion. A uniform aluminide (in-situ) and WC (ex-situ) particle distribution was attained. Two different sliding wear mechanisms were identified for low CVFs (≤1.5%), and high CVFs (2.0%), depending on the extent of particle agglomeration.
2
Content available Microstructure And Mechanical Properties Of Al-WC Composites
Simon A., Lipusz D., Baumli P., Balint P., Kaptay G., Gergely G., Sfikas S., Lekatou A., Karantzalis A., Gacsi Z.
Archives of Metallurgy and Materials
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2015
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Vol. 60, iss. 2B
1517--1521
EN
The scope of the research work is the production and characterization of Al matrix composites reinforced with WC ceramic nanoparticles. The synthesis process was powder metallurgy. The produced composites were examined as far as their microstructure and mechanical properties (resistance to wear, micro/macrohardness). Intermetallic phases (Al12W and Al2Cu) were identified in the microstrucutre. Al4C3 was not detected in the composites. Adding more than 5 wt% WC to the aluminum, microhardness and wear resistance exceed the values of Al alloy. Composites having weak interface bond performed the highest wear rate.
3
Content available Effects Of Nickel On The Microstructure And The Mechanical Properties Of Sn-0.7Cu Lead-Free Solders
Gyenes A., Simon A., Lanszki P., Gacsi Z.
Archives of Metallurgy and Materials
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2015
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Vol. 60, iss. 2B
1449--1454
EN
This paper investigates the effects of small amount nickel addition (0, 200, 400, 800, 1800 ppm) on the microstructure and the mechanical properties of Sn-0.7Cu lead-free solder alloys. It is known that even ppm level Ni additions have significant effects on the microstructure of Sn-Cu solder alloys. Ni suppresses the growth of β-Sn dendrites in favour of eutectic formation. As the nickel content increases, the microstructure undergoes a morphological evolution from hypoeutectic through fully eutectic to hypereutectic. Along with these transformations, the mechanical properties of the alloy also significantly change. Based on the experimental results presented in this paper, the Sn-0.7Cu solder achieves maximum strength at the addition level of 800 ppm Ni, when the microstructure becomes fully eutectic.
4
Content available remote A simultaneous spectrometer with photodiode array detector and low power radiofrequency capacitively coupled plasma source
Frentiu T., Darvasi E., Anghel S. D., Simon A., Ponta M., Cordos E. A.
Chemia Analityczna
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2002
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Vol. 47, No. 5
725-736
EN
The main figures of merit of a simultaneous spectrometer with photodiode array (PDA) detector and low power (275 W; 27.12 MHz) and Ar consumption (0.4 L min(-1)) radiofre-quency capacitively coupled plasma source for simultaneous determination of some alkaline and alkaline-earth elements (Li, Na, K, Ca) are presented. The torch has a molybdenum tubular electrode and a single (SRT) or double ring electrode (DRT) distanced at 60 mm. The simultaneous spectrometer equipped with PDA detector (200-1100 nm) has a 95 mm Paschen-Runge mount. For the best geometry of the plasma (DRT configuration), the limits of detection are: 30 (Li); 40 (Na); 60 (K) ng mL(-1) and 210; 100; 210; 90 ng mL(-1) for Ca(II)393.3 nm, Ca(I) 422.7 nm, CaOH 554 nm and CaOH 622 nm. The recovery degree of Ca in certified plasma sera was 99.4š1.4 % and RSD 3.8-4,9%. In the determination of Ca in five blood samples the RSD was 2.9-4.4%.
PL
Zaprezentowano wielkości charakterystyczne spektrometru z detektorem mozaikowym (PDA) i źródłem wzbudzenia plazmy malej mocy (275 W; 27.12 MHz) przy zużyciu argonu 0.4 L min(-1), do jednoczesnego oznaczania niektórych pierwiastków alkalicznych i ziem alkalicznych (Li, Na, K, Ca). Palnik wyposażony był w molibdenową elektrodę rurową i jedno- (SRT) lub dwupierścieniową (DRT) elektrodę umieszczoną w odległości 60 mm. Równoczesny spektrometr z detektorem PDA (200-1100 nm) pracuje w 95 nm układzie Paschena-Runge'a. Przy najlepszej geometrii plazmy (konfiguracja DRT) granice detekcji wynosiły: 30 (Li); 40 (Na); 60 (K) ngmL(-1) oraz 210; 100:210; 90 ugraL(-1) dla Ca(II) 393.3 nm, Ca(I) 422.7 nm, CaOH 554 nm i CaOH 622 nm. Odzysk Ca w certyfikowanych surowicach wyniósł 99.4š1.4 % a względne odchylenie standardowe 3.8-4.9%. Podczas oznaczania Ca w pięciu próbkach krwi względne odchylenie standardowe wyniosło 2.9-4.4%.
5
Content available remote Crustal deformation studies in the Pannonian Basin using GPS
Grenerczy G., Kenyeres A., Simon A.
Reports on Geodesy
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1998
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z. 5/35
81-89
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