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Wyszukujesz frazę "nitriding surface" wg kryterium: Temat

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    Wyświetlanie 1-6 z 6
    Tytuł:
    Magnetic Properties of Steel Ball Samples, Investigated before and after Nitriding
    Autorzy:
    Fuks, H.
    Kaczmarek, S. M.
    Leniec, G.
    Michalski, J.
    Kucharska, B.
    Wach, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355956.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    EPR-FMR
    magnetization
    iron
    nitriding surface
    Opis:
    Group of steel balls with different chemical composition, diameters and nitriding treatment parameters were investigated with using magnetic resonance and magnetization methods. Emerging nitrided regions consists of diffusion and surface layer of iron nitrides. The thickness of the individual layers depends on the type of steel and process parameters. Resonance signal shape and position were successfully described in the ferromagnetic resonance regime expected for dense iron magnetic system. Influence of the sample size, thermal treatment and carbon content on the absorption signal has been analyzed. Significant magnetic anisotropy has been revealed, as well as non-usual increasing of the magnetization as a function of temperature. It suggests, that overall antiferromagnetic ordering, destroyed by thermal movement, lead to increasing of the ferromagnetic region.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 3; 1235-1242
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Control of kinetics of plasma assisted nitriding process of Ni-base alloys by substrate roughness
    Autorzy:
    Nowak, Wojciech J.
    Powiązania:
    https://bibliotekanauki.pl/articles/175660.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma assisted nitriding
    surface roughness
    nitriding kinetics
    Ni-base alloys
    Opis:
    The present study investigated the effect of surface roughness on plasma assisted nitriding (PAN) process kinetics of Ni-base alloys. Two model alloys, namely Ni-10Cr and Ni-14Cr-4Al (wt.%) and commercial Rene 80, were examined. To elucidate the effect of surface roughness on nitriding kinetics, three methods of surface preparation were used, (1) polishing up with 1 μm diamond suspension, (2) grinding up to 220 grit sand-paper, and (3) grit blasting. The samples from each type of material were nitrided under the same conditions and investigated after processing. It was found that increase in roughness results in decreasing nitriding kinetics. The decrease of nitriding kinetics depends on alloy chemical composition, namely more complex chemistry resulted in smaller decrease of kinetics. Moreover, grit-blasting was found to be an improper method for surface preparation for PAN. The responsible mechanism for the effect of surface roughness on PAN kinetics of Ni-base alloys was proposed.
    Źródło:
    Advances in Manufacturing Science and Technology; 2020, 44, 3; 99-108
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of Different Nitriding Methods on Nitrided Layer Structure and Morphology
    Autorzy:
    Jasiński, J. J.
    Frączek, T.
    Kurpaska, Ł.
    Lubas, M.
    Sitarz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355110.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    active screen plasma nitriding
    ASPN
    nitrided layer
    Armco iron
    nitriding kinetics
    surface morphology
    Opis:
    The paper presents a comparison of the nitrided layer structure and morphology formed with a conventional controlled gas method, widely use in industrial applications and a layer formed with cathode plasma nitriding (CPN) and active screen plasma nitriding (ASPN). Nitriding processes were realized at 793K for different times and altering parameters, depending on the nitriding process technique. Research have been realized on the Fe Armco material using light microscopy (LM), scanning electron microscopy (SEM, SEM/EBSD), X-ray diffraction (XRD-GID) and atomic force microscopy (AFM). Analysis of the results has confirmed that the structure of the nitrided layer depends mainly on process methodology. In addition Authors has also analyzed kinetics of the process which varies and depends mainly from the surface layer saturation mechanism and nitriding parameters. Acquired knowledge on the structural components of the nitrided layer made it possible to optimize the nitriding parameters in order to reduce or even eliminate the usually unfavorable, brittle compounds and porous zones and of the nitrided layer in the aspect of exploitation properties improvement of the metallic materials.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 1; 337-345
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Characteristic of Titanium Alloy Surface Layers Produced by Diode Laser Gas Nitriding
    Autorzy:
    Lisiecki, A.
    Piwnik, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/351668.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium alloys
    laser gas nitriding
    surface layer
    wear resistance
    ball-on-disk
    Opis:
    In order to improve the tribological properties of titanium alloy Ti6Al4V composite surface layers Ti/TiN were produced during laser surface gas nitriding by means of a novel high power direct diode laser with unique characteristics of the laser beam and a rectangular beam spot. Microstructure, surface topography and microhardness distribution across the surface layers were analyzed. Ball-on-disk tests were performed to evaluate and compare the wear and friction characteristics of surface layers nitrided at different process parameters, base metal of titanium alloy Ti6Al4V and also the commercially pure titanium. Results showed that under dry sliding condition the commercially pure titanium samples have the highest coefficient of friction about 0.45, compared to 0.36 of titanium alloy Ti6Al4V and 0.1-0.13 in a case of the laser gas nitrided surface layers. The volume loss of Ti6Al4V samples under such conditions is twice lower than in a case of pure titanium. On the other hand the composite surface layer characterized by the highest wear resistance showed almost 21 times lower volume loss during the ball-on-disk test, compared to Ti6Al4V samples.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 543-552
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of Titanium Metal Matrix Composite Surface Layers Produced During Laser Gas Nitriding of Ti6Al4V Alloy by Different Types of Lasers
    Autorzy:
    Lisiecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351670.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium alloys
    laser gas nitriding
    composite surface layer
    disk laser
    diode laser
    Opis:
    The article presents the results of a comparative study of the nitriding process of titanium alloy substrate using two lasers with different characteristics of laser beams. One of the applied lasers was a high power diode laser emitting at a dominant wavelength of 808 nm, with a rectangular laser beam spot, and multimode energy distribution across the spot. The second laser was a solid state Yb:YAG disk laser emitting at a wavelength of 1.03 μm, with a circular beam spot, characterized by near Gaussian energy distribution across the spot. In a case of both lasers single stringer beads with a similar width and at similar energy input were produced. As a result of melting of the substrate with a laser beam in a pure gaseous nitrogen atmosphere composite surface layers with in situ precipitated titanium nitrides embedded in the metallic matrix of titanium alloy were produced, in both cases. However, the surface topography and structure is different for the surface layers produce by different lasers at the same processing parameters and width of laser beams.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1777-1784
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Importance Of Surface Topography For The Biological Properties Of Nitrided Diffusion Layers Produced On Ti6Al4V Titanium Alloy
    Znaczenie topografii powierzchni dla biologicznych właściwości warstw azotowanych dyfuzyjnie wytwarzanych na stopie tytanu Ti6Al4V
    Autorzy:
    Wierzchoń, T.
    Czarnowska, E.
    Morgiel, J.
    Sowińska, A.
    Tarnowski, M.
    Rogulska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/355494.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti6Al4V titanium alloy
    glow discharge assisted nitriding
    surface topography
    wettability
    blood platelets
    stop tytanu TI6AL4V
    proces azotowania jarzeniowego
    topografia powierzchni
    nasiąkliwość
    płytki krwi
    Opis:
    Diffusion nitrided layers produced on titanium and its alloys are widely studied in terms of their application for cardiac and bone implants. The influence of the structure, the phase composition, topography and surface morphology on their biological properties is being investigated. The article presents the results of a study of the topography (nanotopography) of the surface of TiN+Ti2N+αTi(N) nitrided layers produced in low-temperature plasma on Ti6Al4V titanium alloy and their influence on the adhesion of blood platelets and their aggregates. The TEM microstructure of the produced layers have been examined and it was demonstrated that the interaction between platelets and the surface of the titanium implants subjected to glow-discharge nitriding can be shaped via modification of the roughness parameters of the external layer of the TiN titanium nitride nanocrystalline zone.
    Dyfuzyjne warstwy azotowane na tytanie i jego stopach są szeroko badane m. in. w aspekcie zastosowań na implanty kardiologiczne i kostne. Stąd też analizowany jest wpływ struktury składu fazowego, topografii i morfologii powierzchni na ich właściwości biologiczne. W artykule przedstawiono wyniki badań wpływu topografii (nanotopografii) powierzchni warstw azotowanych –TiN+Ti2N+αTi(N) wytwarzanych w niskotemperaturowej plazmie na stopie tytanu Ti6Al4V na adhezję płytek krwi i ich aglomeratów. Omówiono mikrostrukturę (TEM) wytwarzanych warstw i wykazano, że poprzez stan chropowatości powierzchni zewnętrznej strefy warstwy azotowanej – nanokrystalicznego azotku tytanu (TiN) można kształtować oddziaływanie płytek krwi z powierzchnią implantów tytanowych poddanych procesowi azotowania jarzeniowego.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2153-2159
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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