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    Wyświetlanie 1-4 z 4
    Tytuł:
    Microscale interpretation of tribological phenomena in Ti/TiN soft-hard multilayer coatings on soft austenite steel substrates
    Autorzy:
    Lackner, J.
    Major, L.
    Kot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/200127.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Ti/TiN multilayer coating
    magnetron sputtering
    wear
    TEM
    Opis:
    The mechanical and tribological behavior of physical vapor deposited coatings on soft substrate materials gains increasing interest due to economical and environmental aspects – e.g. substitution of steels by light-weight metals or polymers in transport vehicles. Nevertheless, such soft materials require surface protection against wear in tribological contacts. Single layer hard coatings deposited at room temperature are brittle with a relatively poor adhesion. Therefore, they should be better substituted by tough multilayer coatings of soft-hard material combinations. However, the mechanics of such multilayer coatings with several 10 nm thick bilayer periods is difficult and yet not well described. The presented work tries to fill the gap of knowledge by focusing both on mechanical investigations of hardness, adhesion, and wear and on microscopic elucidation of deformation mechanisms. In the paper 1 ěm thick Ti/TiN multilayer stacks were deposited by magnetron sputtering on soft austenitic steel substrates at room temperature to prevent distortion of functional components in future applications. High hardness was found for 8 and 16 bilayer films with modulation ratio Ti:TiN = 1:2 and 1:4. This was attributed (with use of transmission electron microscopy) to stopping the crack propagation in thin Ti layers of the multilayer systems by shear deformation combined with different fracture mechanisms in comparison with that for the TiN single layers (edge cracks at the border of the contact area and ring cracks outside, respectively).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2011, 59, 3; 343-355
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure characterization of localized corrosion wear of Cr/Cr2N+ a-C:H/a-C:H:Cr multilayer coatings on carbon fiber composites
    Autorzy:
    Janusz, M.
    Major, L.
    Lackner, J. M.
    Grysakowski, B.
    Krawiec, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/200247.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nano-composite multilayer coatings
    micro-corrosion
    carbon fiber composite
    microstructure characterization
    TEM
    charakterystyka mikrostruktury
    nanokompozyty wielowarstwowe
    kompozyt z włóknami węglowymi
    Opis:
    The use of carbon fiber composites (CFC) for different applications is widespread. Carbon-based materials show, however, significant oxidative degradation in air. Modern materials are subjected to aggressive, corrosive environment. This type of environment may strongly reduce their mechanical properties. For the protection of CFC, it was necessary to apply coatings to the composite surface. In the presented paper, a chromium/chromium nitride (Cr/Cr2N) multilayer structure has been selected as the inner part. The outer part of the coating was a hydrogenated amorphous carbon (a-C:H), gradually implanted by Cr nanocrystals. The application of transmission electron microscopy (TEM) indicated that the proposed deposition method allowed the formation of a Cr/Cr2N multilayer of Λ = 150 nm, topped with a-C:H+ Cr23C6 composite of a varied carbides density. The micro-hardness of the deposited coatings was up to 14 GPa (at a load of 2 and 5 mN). The microstructure of the deposited coatings was described in detail by means of TEM in the authors’ recently published paper [1]. This paper is a continuation thereof, aimed at describing microstructure changes after a localized corrosion process. In order to study localized corrosion in coatings, particularly in metallic (Cr) interlayers, the potential measurements and voltammetry experiments were performed in a Ringer solution. The open-circuit potential reaches stable values after a sufficient time period. The results indicated that the presence of a-C:H+Cr23C6, the outer part of the coating, speeds up the localized corrosion process in Cr interlayers in the inner part of a coating.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 2; 171-177
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser modification of the materials surface layer - a review paper
    Autorzy:
    Kusiński, J.
    Kac, S.
    Kopia, A.
    Radziszewska, A.
    Rozmus-Górnikowska, M.
    Major, B.
    Major, L.
    Marczak, J.
    Lisiecki, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/201655.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lasers in Poland
    laser surface heat treatment
    laser melting
    alloying
    cladding
    laser ablation
    laser cleaning
    laser shock processing (LSP)
    laser texturing
    multilayer coatings
    Opis:
    The state of laser processing in surface materials modification in Poland is reported, based on own experience, coworkers and coauthors results, as well the literature review. The curriculum concerning historical development of lasers and laser technology in Poland, laser-matter interaction, as well basis of different laser techniques applied in materials surface engineering (solid state hardening, melting, alloying, cladding, ablation, shot peening, cleaning and texturing) are reviewed, and compared with results of coauthors, as well with a wide range of Polish authors papers. Finally, it is concluded that overall state of research on laser application in surface engineering in Poland is well developed and still growing industrial application is observed.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 4; 711-728
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Model of multiple-layer pavement structure-subsoil system
    Autorzy:
    Kadela, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/199780.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    road pavement
    mechanical methods
    multilayer structure
    calculation model
    finite element analysis
    FEA
    nawierzchnia drogowa
    metody mechaniczne
    struktura wielowarstwowa
    model obliczeniowy
    analiza metodą elementów skończonych
    Opis:
    Progress made in recent years has brought about a high demand for increasingly modern structural and technological solutions. Each structure should in turn be designed and built to show sufficient durability for the intended period of use. The requirement of durability is met if, throughout its intended lifetime, the structure fulfils its roles regarding load-bearing capacity, serviceability limits and stability without excessive, unexpected costs. Due to the above, a need arises to predict the response of an engineering structure to given loads throughout its life. Thus it becomes increasingly common to employ numerical analyses using the finite elements method (FEM), both on the design stage and later, for the purposes of evaluating the state of a specific structure. However, a numerical calculation model may be constructed in different ways. This paper presents the impact of geometry of the model, the choice of a discretization mesh and the choice of a continuous 3D or 2D model corresponding to pavement-subgrade system calculation model. 3-dimensional modelling was carried out in this paper as full modelling of actual engineering problems in 3-dimensional space, and in the form of simplified modelling using axial symmetry. In the model, a traditional multi-layer pavement structure was considered. Criterion values obtained in numerical analyses were compared to values obtained with the use of VEROAD software.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2016, 64, 4; 751-762
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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