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Microstructural characterisation of sintered soft magnetic nanocomposite materials

Konieczny J., Czaja I., Dobrzański L.A.

Journal of Achievements in Materials and Manufacturing Engineering

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2013

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Vol. 61, nr 2

202--209

EN

Purpose:The main aim of this work is to investigate microstructure of of sintered soft magnetic nanocomposite materials produced by sintering axially on one side in the ambient atmosphere. Design/methodology/approach: Microstructure observations of 20 mm diameter sintered roller by light microscopy OLYMPUS, scanning electron microscopy OPTON DSM-940 and ZEISS SUPRA 35, and transmission electron microscopy JEOL 3010. The X-ray tests were realized with the use of the XRD 7 SEIFERT-FPM diffractometer equipped with the lamp of the cobalt anode of 35 kV voltage and 30 mA filament current was used. The nanocrystalline ferromagnetic powders were manufactured by high-energy ball milling (8000 SPEX CertiPrep Mixer/Mill) of metallic glasses ribbons in as state. The hot pressing process was made on machine “Degussa”. Findings: The analysis of the results enabled determination of the hot pressing parameters on structure of obtained stampings. This is typical of an dispersion strengthened case. Research limitations/implications: For the sintered roller obtained from metallic Co-based amorphous ribbons, further mechanical and magnetic examinations are planed. Practical implications: Conducted research shows that applied technology of sintered roller production allows to obtain good microstructural characteristics. Structure analysis of die stampings of powdered amorphous metallic ribbons is helpful to prepare this material by laboratory methods. Feature an alternative to commercial alloys and composite materials are the amorphous and nanocrystalline metal amorphous ribbons obtained by melt spinning technique and make it possible to obtain the new composite materials with best magnetic properties, which dimensions and shape can be freely formed. Originality/value: The paper presents influence of hot pressing parameters process of metallic powdered ribbons Co77Si11.5B11.5 on structure of obtained die stampings.

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Magnetic properties of Co-based amorphous ribbon under cyclic heating and cooling

Konieczny J., Borisjuk A., Pashechko M., Dobrzański L. A.

Journal of Achievements in Materials and Manufacturing Engineering

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2010

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Vol. 42, nr 1-2

42-49

EN

Purpose: The aim of the work is to investigate the changes of magnetic properties of the cobalt based Co68Fe4Mo1Si13.5B13.5 alloy under cycling heating and cooling. Design/methodology/approach: The amorphous metallic ribbons were manufactured by planar-flow-casting method. Investigations of the magnetic properties were observed under permanent heating amorphous and partially crystallized alloy. Observations of the structure were made on the JOEL transmission electron microscope (TEM). Using the HFQS program the distributions of the magnetic hyperfine P(H) fields were determined for spectra smoothed in this way, employing the Hesse-Rübartsch method. Findings: The analysis of the magnetic properties under permanent heating and structure of the Co-based amorphous ribbons obtained in the by planar-flow-casting process proved that the permanent heating caused the crystallization of second magnetic phase after transition near to paramagnetic state. Research limitations/implications: The appropriate cyclic heating and cooling significantly decreasing soft magnetic properties of examined amorphous alloy. The cyclic heating beginning of elementary crystallization processes and the end of crystallization alloy. Practical implications: According to the results presented in the paper the examined Co-based glassy alloys as a soft ferromagnetic material may be utilized in construction of magnetic cores such as choke coils, common mode and noise filter and is of great technological interest. Originality/value: The paper presents influence of permanent heating on structural changes of metallic ribbons. Results and discussion of the influence of permanent heating on magnetic properties of metallic ribbon are presented.

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Wytwarzanie taśm amorficznych FeNbCuSiB z zastosowaniem podawania ciekłego stopu na dolną powierzchnię wirującego bębna

Kolano R., Polak M., Kolano-Burian A., Szynowski J., Wójcik N.

Problemy Eksploatacji

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2006

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nr 3

125-132

PL

W artykule przedstawiono nową metodę wytwarzania taśm amorficznych poprzez ultraszybkie schładzanie ciekłego stopu na dolnej powierzchni wirującego bębna metalowego. Opisano zasadę działania eksperymentalnego urządzenia odlewniczego zaprojektowanego i zbudowanego w Instytucie Metali Nieżelaznych w Gliwicach oraz wyniki dotychczas przeprowadzonych testów ze szczególnym uwzględnieniem problemu transportu ciekłego metalu na dolną powierzchnię bębna. Wyniki badań otrzymanych taśm potwierdziły ich dobre właściwości mechaniczne, strukturalne i magnetycznie miękkie.

EN

A new fabrication method of amorphous ribbons by rapid quenching of a liquid metal on a bottom surface of rotating copper wheel has been presented. Principle of operation of an experimental casting installation designed and built at the Institute of Non-Ferrous Metals in Gliwice, Poland, has been described together with results of tests carried out so far, with a special emphasis put on the problem of transporting molten metal onto a bottom surface of a wheel. Examination of the amorphous ribbons obtained confirmed their good mechanical, structural and soft magnetic properties.

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Nowoczesne materiały magnetycznie miękkie w energetyce i elektronice.

Gacek Z., Sosiński R.

Prace Naukowe Instytutu Podstaw Elektrotechniki i Elektrotechnologii Politechniki Wrocławskiej. Konferencje

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2006

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Vol. 44, nr 18

412-416

PL

W artykule przedstawiono podstawowe wiadomości dotyczące taśm amorficznych stosowanych do budowy rdzeni energooszczędnych transformatorów rozdzielczych oraz urządzeń elektrycznych i elektronicznych. Ponadto artykuł zawiera informacje o nanokrystalicznych materiałach magnetycznych i wybranych możliwościach ich zastosowania. W artykule przedstawiono również informacje o technologii produkcji omawianych materiałów.

EN

The article contains the basis information about amorphous ribbon and low-loss grain oriented silicon steel used in energy-saving distribution transformer and other electrical or electronic devices. Additionally, in article an information about nanocrystalline soft magnetic materials and their application was presented. The article contains description of preparation techniques above soft magnetic materials.