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Properties of Fe73Ni5Y3B19 amorphous ribbon produced by melt-spinning

Zdrodowska K., Kwarciak P., Szota M., Nabiałek M.

Journal of Achievements in Materials and Manufacturing Engineering

2013

Vol. 61, nr 2

381--387

Purpose: The purpose of the study is to examine the mechanical properties of Fe73Ni5Y3B19, alloy and to carry out the comparative examination of matt and glossy sides of those alloys. Design/methodology/approach: The Fe73Ni5Y3B19, alloy have been produced by the melt-spinning method which involves rapid cooling of the metal on a spinning copper cylinder. The cooling rate has required for obtaining the amorphous alloy ranges from 10 5 to 106 K/s. The above-mentioned method is popular and often used; however, in order to obtain alloys of amorphous structure, it should be assured that the conditions for obtaining amorphous materials, as set by A. Inoe, are satisfied. Findings: Mechanical properties, such as microhardness, roughness, abrasive wear with the use of a ball tester, have been described and the X-ray diffraction has been determined in the paper. Research limitations/implications: Analyzed modernization of the machine refers to pin on disc, disc-disc, block and disc unit sliding friction processes. Practical implications:The Fe73Ni5Y3B19 amorphous alloys find the application in the power industry, where they are used for transformer cores.

The role of omni-directional gas pressure at thermal treatment of FeNbCuBSi ribbons

Butvinová B., Butvin P., Schäfer R., Grgač P.

Archives of Materials Science

2004

Vol. 25, nr 4

415-422

FeNbCuBSi ribbons were annealed under 0.1 GPa omni-directional pressure of pure Ar and compared to equivalent samples annealed at normal pressure and in vacuum. Magnetization work, incremental permeability and domain structure observation was used for the comparison. The result is explained on the basis of macroscopic heterogeneity, slightly promoted by pressure in certain compositions.

Zirconia based nanomaterials: elaboration, characterization and transport properties.

Monty C., Bousseta H., Rouanet A., Sibieude F., Amdouni-Cheikh A., Madani A., Roucau C., Snoeck E., Brun N., Georgescu C., Lelievre D., Piticescu R.R., Carry C., Begin-Colin S., Gandhi A.S., Jayaram V.

Inżynieria Materiałowa

1999

R. XX, nr 1

29-31

Yttria doped zirconia nanophases ('0D-NANOS' as ultrafine powders) yttria doped zirconia/alumina nanocomposites ('3D-NANOS' as ribbons), have been obtained using high concentration solar image furnaces. The two techniques used (vaporization-condensation and splat-cooling) are described. Ribbons were grinded by various routes. The nanostructure of these nanomaterials was characterized using X-ray diffraction (X-D) and High Resolution Electron Microscopy (HREM). Oxygen transport properties were investigated by Impedance Spectrometry (IS). Bulk conductivity was compared to data obtained from single crystals and literature data. The grain boundary contribution has been found higher than the volume one is a typical case of 4% mol yttria doped zirconia. Oxygen transport mechanisms are discussed.

W piecach słonecznych o wysokiej zdolności koncentracji energii uzyskano nanometryczny proszek tlenku cyrkonu domieszkowanego itrem ('OD-NANOS w postaci ultradrobnego proszku) oraz domieszkowany itrem nanometryczny kompozyt tlenek cyrkonu/Al2O3 ('3D-NANOS w postaci taśm). Opisano dwie zastosowane metody (odparowanie-kondensacja i ultraszybkie chłodzenie). Taśmy były mielone w młynach kulowych w celu uzyskania proszku. Lity materiał uzyskano spiekając ultradrobne proszki otrzymane różnymi metodami. Nanostrukturę tak uzyskanych próbek charakteryzowano stosując metody dyfrakcji promieniowania rentgenowskiego (X-D) i mikroskopię elektronową wysokiej rozdzielczości (XREM). Zjawiska transportu tlenu badano metodą spektroskopii impedancyjnej (IS). Przewodność właściwą próbek spiekanych porównano z wynikami uzyskanymi dla pojedynczych kryształów oraz danymi literaturowymi. Stwierdzono, że udział granic ziarn w badanych materiałach jest wyższy niż w typowym przypadku 4% mol tlenku cyrkonu domieszkowanego itrem. Przedyskutowano także mechanizmy transportu tlenu.