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    Wyświetlanie 1-5 z 5
    Tytuł:
    Present status and prospects of research in SINS on the modification of surface properties by pulsed plasma streams
    Autorzy:
    Langner, J.
    Piekoszewski, J.
    Stanisławski, J.
    Werner, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/146758.pdf
    Data publikacji:
    2000
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    IONOTRON plasma injector
    pulsed plasma processing
    surface modification
    Opis:
    The paper presents examples of the most important results obtained in SINS during the last decade, interesting from the point of view of industrial applications. It also indicates some of the most prospective directions in research on modification of the surface properties of materials by means of pulsed plasma streams.
    Źródło:
    Nukleonika; 2000, 45, 3; 193-197
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    An apparatus for sequential pulsed plasma beam treatment in combination with Arc PVD deposition
    Autorzy:
    Stanisławski, J.
    Piekoszewski, J.
    Richter, E.
    Werner, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/147034.pdf
    Data publikacji:
    2002
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    Arc-PVD
    interlayer
    pulse plasma treatment
    Opis:
    A hybrid type of apparatus is described which enables one to form a thin multi-layer film on the surface of any kind of solid substrate. In one process, the surface is treated with a high intensity pulse plasma beam which introduces the chosen kind of atoms into the near-surface layer of the substrate. In the second process, following the first without breaking the vacuum, the coating is formed by arc PVD (physical vapour deposition) process. Two examples of coatings formed on metallic and ceramic substrates are presented.
    Źródło:
    Nukleonika; 2002, 47, 3; 119-122
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Ion Implantation and Transient Melting: A New Approach to Formation of Superconducting MgB$\text{}_{2}$ Phases
    Autorzy:
    Piekoszewski, J.
    Kempiński, W.
    Stankowski, J.
    Prokert, F.
    Richter, E.
    Stanisławski, J.
    Werner, Z.
    Szymczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2041609.pdf
    Data publikacji:
    2004-12
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    74.78.-w
    Opis:
    An attempt to synthesize superconducting MgB$\text{}_{2}$ inter-metallic compound from the liquid state is presented. The process consists of two steps. In the first one, boron ions are implanted into a magnesium substrate. In the second one, the near-surface region of such system is melted by short, intense hydrogen plasma pulses without necessity of annealing in Mg vapor. A magnetically modulated microwave absorption method was used to detect superconducting regions in the obtained MgB$\text{}_{2}$ layer. Percolation between nano-regions (islands) of MgB$\text{}_{2}$ has not been observed. However, a superconducting state of the insulated islands has been experimentally proven with transition temperatures T$\text{}_{C}$ as high as 31 K.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 6; 861-868
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Interaction of nitrogen atoms in expanded austenite formed in pure iron by intense nitrogen plasma pulses
    Autorzy:
    Piekoszewski, J.
    Sartowska, B.
    Waliś, L.
    Werner, Z.
    Kopcewicz, M.
    Prokert, F.
    Stanisławski, J.
    Kalinowska, J.
    Szymczyk, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/147989.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alfa-to-gamma phase transformation in iron
    expanded austenite
    intense nitrogen plasma pulses
    Opis:
    The paper presents the results of experiments on modification of pure iron by high-intensity nitrogen pulsed-plasma treatment. The duration of nitrogen plasma pulses is approximately 1 mi s, and the energy density amounts to about 5 J/cm2. Such pulses are capable to melt the surface layer of the substrate (1- 2 mi m) and to introduce a significant concentration of nitrogen into the molten layer. Nuclear reaction analysis (NRA), X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS) were used for characterisation of the treated samples. The main results of the data analysis are as follows: it has been stated that such treatment leads to gradual transformation of initial alfa-phase into austenitic gamma structure in which expanded austenite gammaN is present. Treatment with 20 pulses results in almost complete transformation and introduces a retained dose of nitrogen estimated as 5.5 × 1017 N/cm2. The susceptibility for expansion of the lattice transformed to austenite in this way is smaller than in the case when the steel subjected to conventional nitriding is originally of austenite type. The analysis of the ratio of alfa to gammaN as a function of the nitrogen content provides a firm evidence that strong repulsion forces act between the first and the second nearest-neighbour nitrogen atoms in the fcc austenitic structure formed as a result of nitriding of pure iron by intense nitrogen plasma pulses.
    Źródło:
    Nukleonika; 2004, 49, 2; 57-60
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Formation of Superconducting Regions of MgB_2 by Implantation of Boron Ions into Magnesium Substrate
    Autorzy:
    Trybuła, Z.
    Kempiński, W.
    Andrzejewski, B.
    Piekara-Sady, L.
    Kaszyński, J.
    Piekoszewski, J.
    Werner, Z.
    Richter, E.
    Prokert, F.
    Stanisławski, J.
    Barlak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2043433.pdf
    Data publikacji:
    2005-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.-b
    74.78.-w
    Opis:
    The results of investigation of the MgB$\text{}_{2}$ inter-metallic compound with the use of boron ions implantation and plasma pulse treatment are presented. The samples were characterized by: four-probe electric conductivity measurements, magnetically modulated microwave absorption, and magnetic measurements. For hydrogen and argon pulsed plasma treatment the samples with T$\text{}_{c}$ ranging from 10 K to 32 K were obtained. The superconducting phase does not form a continuous layer since the resistivity does not fall down to zero. Apparently, separate islands of superconducting phase are connected through metallic Mg paths. All samples are still below the percolation threshold.
    Źródło:
    Acta Physica Polonica A; 2005, 108, 1; 165-170
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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