Wyniki wyszukiwania - Biblioteka Nauki

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Determination of chemical composition and structure of YBa2Cu3O7-x – YBCO/Cu 2G HTS superconducting tape

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Jędryka J. , Szota M. , Nabiałek M. , Szota K. , Łukaszewicz A.

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tom Vol. 70, nr 1

14--20

EN

Purpose: The paper concerns the determination of the chemical composition and structure of high-temperature superconducting tapes YBa2Cu3O7-x– YBCO/Cu 2G HTS. Design/methodology/approach: Studies were carried outusing a scanning electron microscope with a chemical composition analyser on prepared samples of a tape. Moreover, an abrasion resistance test which shown resistance to friction at 1, 2 and 3 hours by using ball-tester was carried out. The individual layers which are components of the test tape and depths of wipes which appeared after test on ball-tester were evaluated. Findings: Studies showed a lot of information about abrasion resistance of tapes. Hourly friction, using ceramic ball did not result in breakthrough coating. The investigation are carried out for one, two and three hours. They also confirmed the chemical compositions provided by the manufacturer, as well as describe the individual layers of examined superconducting tapes. Originality/value: Detailed studies in particular, on wear resistance of superconductors, which relate to the chemical composition of the tapes, and their construction carried out in the context of the article, may be a prelude to further research into the production of superconducting tapes that will show much greater resistance to abrasion. The essence of the problem is a construction base, in particular during the installation of such tapes, for example in the form of a transformer winding.

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Badanie właściwości powłok stosowanych w taśmach nadprzewodzących

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Szota M. , Jędryka J. , Nabiałek M. , Gawroński J. , Dudek A.

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tom Vol. 32, nr 4

756-759

PL

W pracy przedstawiono wyniki badań przeprowadzonych dla taśm nadprzewodzących z rodziny YBCO oraz BSCCO. W celu określenia odporności na zarysowanie oraz parametrów chropowatości powierzchni wykonano pomiary na scratch testerze oraz profilometrze. Uzyskane wyniki badań przedstawione zostały w postaci wykresów obrazujących podstawowe parametry charakteryzujące procesy. Na podstawie uzyskanych charakterystyk określono siłę tarcia, współczynnik tarcia, głębokość penetracji oraz podstawowe parametry chropowatości powierzchni materiałów nadprzewodzących. Dokonano również analizy wykonanych pomiarów oraz określono oddziaływanie penetratora na badany materiał w zależności od rodzaju fazy nadprzewodzącej.

EN

The paper presents investigations of mechanical properties conducted for superconducting tapes which belong to YBCO and BSCCO family. Presented results were in the form of graphs illustrating the basic parameters characterizing surface scratching process. On the basis of these characteristics the strength friction, friction coefficient, penetration depth and the basic roughness parameters of superconducting surface were specified. Additionally after analysis of obtained parameters the impact of the penetrator on the investigated material, depending on the type of superconducting phase were determined.

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Thermal analysis of SF12050 high temperature superconducting tape

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Jędryka J. , Szota M. , Nabiałek M. , Szota K. , Łukaszewicz A.

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tom Vol. 69, nr 1

25--31

EN

Purpose: The paper deals with the determination of the impact and the possibility of heat treatment in order to improve the properties of YBa2Cu3O7-x- YBCO 2G HTS high-temperature superconducting tapes. Design/methodology/approach: Test samples of SF12050 superconducting tape, subjected to heat treatment - annealing in the temperature range of 450-1000°C. Two types of cooling were used on the air and with the furnace. Thus prepared samples were subjected to differential scanning calorimeter DSC - TG NETZSCH STA 409C.Results:The analysis was also subjected to the influence of temperature on the consistency of the protective layer with the other components of the tape, and a mechanism for destruction of the tape as a result of the impact of elevated temperatures. The paper also contains images of selected sections of the SF12050 superconducting tape which were preheated in the temperature range of 450-1000°C. Originality/value: Research carried out in the context of the article, made it possible to trace the influence of temperature on the destruction of superconducting tapes. Those studies show the destructive effects that may occur when using the type of tape, in particular as regards their application in the form of windings in transformers. Detailed knowledge of the thermal degradation mechanism of superconducting tapes, may lead to a response on how to modify them in order to avoid the devastating effect of temperature during operation.

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Studies of selected properties of high-temperature superconducting tape 2G HTS SF series - the example: tape SF12050

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Jędryka J. , Szota M. , Nabiałek M. , Łukaszewicz A. , Bukowska A.

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2013

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tom Vol. 61, nr 2

187--194

EN

Purpose: In presented paper were characterized selected properties of high-temperature superconducting tape 2G HTS SF series - the example of the tape SF12050. Design/methodology/approach: As part of the study smples of tape SF12050 were made. At first made to measure of chemical compsition and compared with manufacturer’s information about that kind of tape. Second step of researcher were research about adhesion of the individual layers of SF12050. After then research was made about tensile strengtht what is the justification utility, as these tapes are subjected to tension at the time of their formation and winding on the transformer core. Findings: As a result of research obtained information on the chemical composition, scratch resistance, adhesion of coating on the tape and about tensile strength. On the last step studies were conducted about critical currents - Ic. Research limitations/implications: These results allow to identify the suitability of these tapes for use on a wide scale - in particular, the winding of the transformer cores. Originality/value: On the basis of studies have demonstrated applications for which the tape may be used SF12050. Given its properties – scratch resistance and tensile strenght reistance, and information about critical current, was indicated best use of that tape for trnasformers production.

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Porównanie struktur i parametrów prądowych wybranych taśm nadprzewodzących drugiego rodzaju

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Szota M. , Nabiałek M. , Szota K. , Jędryka J. , Jeziorski L.

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tom Vol. 31, nr 4

1245-1248

PL

W pracy przedstawiono porównanie struktur oraz charakterystyk prądowo- napięciowych wybranych wysokotemperaturowych taśm nadprzewodzących. W artykule zamieszczone zostały obrazy mikroskopowe nowej generacji nadprzewodników drugiego rodzaju, przedstawiające warstwowy układ nadprzewodników na podłożu stalowym lub niklowym. Do badań parametrów prądowych został zbudowany układ pomiarowy umożliwiający badanie odcinków taśm w temperaturze ciekłego azotu. Układ ten jest zasilany źródłem prądu stałego o parametrach I = 0÷580 A oraz U = 0÷8 V. Pomiary prądu krytycznego są wykonywane przez określenie spadku napięcia z dokładnością do 1 nV na odcinku pomiarowym nadprzewodnika. Przedstawiono również sposób przygotowania taśm do badań, oraz sposób lutowania taśm do układu pomiarowego co determinuje poprawność pomiarów.

EN

Structure and current characteristics of selected high temperature superconducting sheets is presented in this paper. Study of the microstructure of II type superconductors were performed. The superconducting layers were deposited on stainless steel or nickel substrates. A special cryogenic measurement system was built for investigation current parameters of superconducting wires sections. This system is powered from DC power supply with output 0÷8 V/0÷580 A. For investigation of current-voltage characteristic nano-voltmeter KTH 182 was used. It made possible measurements of voltage drop with precision 1 nV. A method of preparation of superconductors investigations was presented in the paper as well.