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    Wyświetlanie 1-10 z 10
    Tytuł:
    Contribution of titanium, chromium and carbon buffer interlayers to bio-tribological properties of multilayer composites
    Autorzy:
    Major, Ł.
    Janusz, M.
    Lackner, J. M.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352343.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bio-tribological coatings
    wear mechanism
    microstructure
    Opis:
    Research studies on bio-tribological protective coatings of titanium, chromium and carbon based have been performed. Thin films were fabricated by hybrid PLD technique (PLD supported by magnetron sputtering). Coatings consisted of two parts; the inner part (first from the substrate) in each case was formed by titanium or chromium/titanium nitride or chromium nitride (Ti/TiN or Cr/Cr2N). The outer part was formed by pure DLC or multilayer DLC'Ti or Cr. No delamination was found at the interface. Titanium or chromium metallic layer was deposited as a first layer directly on the metallic substrate to avoid delamination. All individual layers were built of columnar nano- crystallites. Mechanisms of the mechanical wear of analyzed systems were presented, focusing on the cracking propagation in ball-on-disc tests using an 1 N and 5 N applied loads for 5 000 cycles. Complex microstmcture analysis of presented nano-multilayer coatings, before and after mechanical tests, were performed by means of transmission electron microscopy (TEM). The highest stress concentration during mechanical uploading was moved through the multilayer coating by breaking only one layer at the time. The microstructure characterization revealed that cracking propagating in the outer part of the coating was stopped at the interface. In the case of the inner part of the coating Ti/TiN; Cr/Cr2N, ceramic layers showed brittle cracking, while metallic (Ti or Cr) ones deformed plastically. Fabricated coatings were subjected under the analysis in the biomechanical system optimized to test for the direct contact with a human whole blood. The study considered physiological conditions mainly related to the temperature and humidity and the frequency of cyclic deformation of the artificial vessel into which the tested sample was introduced.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1391-1398
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dry And Ringer Solution Lubricated Tribology Of Thin Osseoconductive Metal Oxides And Diamond-Like Carbon Films
    Tribologia suchych i smarowanych roztworem Ringera cienkich filmów na bazie tlenków metali i diamentopodobnych promujących procesy ostointegracyjne
    Autorzy:
    Waldhauser, W.
    Lackner, J. M.
    Kot, M.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/351772.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biotribology
    thin films
    lubrication
    tribologia
    cienki film
    smarowanie
    Opis:
    Achieving fast and strong adhesion to jawbone is essential for dental implants. Thin deposited films may improve osseointegration, but they are prone to cohesive and adhesive fracture due to high stresses while screwing the implant into the bone, leading to bared, less osteoconductive substrate surfaces and nano- and micro-particles in the bone. Aim of this work is the investigation of the cohesion and adhesion failure stresses of osteoconductive tantalum, titanium, silicon, zirconium and aluminium oxide and diamond-like carbon films. The tribological behaviour under dry and lubricated conditions (Ringer solution) reveals best results for diamond-like carbon, while cohesion and adhesion of zirconium oxide films is highest.
    Osiągnięcie szybkiego i trwałego przylegania powierzchni biomateriału do kości szczęki ma zasadnicze znaczenie dla implantów dentystycznych. Cienkie osadzone filmy mogą poprawić osteointegrację ale są podatne na kohezyjne i adhezyjne pękanie podczas wkręcania implantu do kości, prowadząc do odsłoniecia mniej osteokonduktywnych powierzchni podłoża oraz powodując tworzenie się nano- i mikro cząstek. Celem niniejszej pracy są badania naprężeń wywołujących defekty w osteointegracyjnych filmach na bazie tantalu, tytanu, cyrkonu oraz tlenku aluminium i diamentopodobnych. Tribologiczne najlepsze właściwości w warunkach suchych i smarowania (roztwór Ringera) wykazały powłoki diamentopodobne, natomiast spójność i przyczepność filmy z tlenku cyrkonu.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2139-2144
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    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:
    Contribution of TiN/Ti/a-C:H multilayers architecture to biological and mechanical properties
    Autorzy:
    Major, L.
    Lackner, J. M.
    Kot, M.
    Janusz, M.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/200944.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    microstructure
    smooth muscle cells adhesion
    cracking
    Opis:
    Complex microstructure analysis of TiN/Ti/a-C:H multilayer coatings, subjected to mechanical and biological tests, were performed by means of transmission electron microscopy (TEM) and confocal scanning laser microscopy (CSLM), respectively. Influence of interface numbers and phase ratios on coating properties was studied. Thin films were fabricated by a hybrid PLD technique (PLD supported by magnetron sputtering). The a-C:H phase was characterized by an amorphous structure, while TiN was built of columnar crystallites. Multilayer coatings contained sequentially deposited TiN and a-C:H layers with thin metallic Ti inter- layers deposited at each interface. Mechanisms of mechanical wear of analyzed systems were presented focusing on the cracking propagation revealed in the scratch test. Biological tests were done basing on smooth muscle cells adhesion to coating surfaces. An increase of TiN phase in the coating led to improvement of mechanical properties, while the carbon phase improved the biological behavior. Coatings comprising a higher rate of the carbon (a-C:H) revealed brittleness and were prone to delaminating. Optimal properties from the mechanical and biological point of view were stated for 8xTiN/Ti/a-C:H coating with 1:1 phase ratio (TiN to a-C:H).
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 3; 565-570
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tailored Al2O3-Al2TiO5-TiO2 Composite Ceramics from different Titanium Precursors
    Autorzy:
    Dittert, B.
    Wiessner, M.
    Angerer, P.
    Lackner, J. M.
    Leichtfried, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/352009.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    precursor
    infiltration
    alumina
    tialite
    Opis:
    Al2 O3 -Al2 TiO5 -TiO2 composites can be obtained by the infiltration of molecular titanium precursors into presintered α-Al2 O3 (corundum) cylinders. Two titanium tetra alkoxides, and two dialkoxy titanium bis (acetylacetonates) serve as precursors for TiO2 (rutile) and Al2 TiO5 (tialite). The precursors were infiltrated as ethanolic solutions. After sintering at 1550, 1600, and 1650°C, the prepared ceramics’ properties were investigated by SEM, in-situ HT-XRD, and conventional XRD. Titanium tetraisopropoxide leads to the highest content of Al2 TiO5 in the composite. The more reactive the precursor, considering the Al2 O3 /precursor interface, the lower and more anisotropic the grain growth, the more homogeneous is the TiO2 contribution and the higher is the content of Al2 TiO5 . Raising the sintering temperature causes an increase of the crystalline Al2 TiO5 content as well as of the grain growth. Moreover, the reactivity of the precursor molecule influences the Ti/(Al+Ti) ratio in the obtained tialite phase.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1277-1286
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of surface modification methods for ReligaHeart® cardiac support system
    Autorzy:
    Major, R.
    Kustosz, R.
    Trembecka-Wójciga, K.
    Lackner, J. M.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352605.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ReligaHeart® cardiac support system
    pneumatic heart
    blood-polymer barrier
    proangiogenic effect
    Opis:
    The work is a review of the methods of the surface modification performed by the authors dedicated for for cardiac support system. It presents the evolution of designing the surface dedicated to direct contact with blood. Initially thin and ultrathin coatings were developed. They were designed as a blood-polymer barrier. The pneumatic heart assist devices are made of a medical grade polyurethane. A major milestone was to create advanced ceramic thin films expressing the flexible effects deposited by physical techniques. Coatings have evolved. Another milestone was the surface reproducing the microenvironment to capture progenitor cells from the bloodstream. Thin coatings were prepared, using methods of ion been, controlled residual stresses were introduced. Wrinkles appeared without cracking. This enabled taking control over the process of cell differentiation. Alternatively, the tissue inspired structure resulted of the coating in the form of extracellular matrix. The outer surface was modified with synthetic materials. This enabled the effective proteins docking to induce cell growth, recreating the luminal side of the blood vessel. Coagulation processes have been slowed down. In addition, it was found pro-angiogenic effect.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1399-1404
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Roughness Influence on Macro- and Micro-Tribology of Multi-Layered Hard Coatings on Carbon Fibre Polymer Composite
    Wpływ chropowatości na makro- i mikro-tribologię wielowarstwowych twardych powłok na bazie zbrojonych włóknami kompozytów polimerowych
    Autorzy:
    Lackner, J. M.
    Major, B.
    Waldhauser, W.
    Mzyk, A.
    Major, Ł.
    Kot, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/354807.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    carbon fibre reinforced polymers
    hard coatings
    multi-layer
    roughness
    tribology
    polimery węglowe wzmocnione włóknami
    twarde powłoki
    powłoki wielowarstwowe
    chropowatość
    tribologia
    Opis:
    Goal of this work is the investigation of roughness influences on the abrasive wear behaviour of magnetron sputtered multi- -layered, low-friction coatings on carbon-fibre reinforced polymers (CFRP). Higher coating roughness at similar CFRP quality was realized by higher deposition rates, leading to increased heat flux to the substrates during deposition. Thermal expansion of the epoxy matrix on the micro scale results in a wavy, wrinkled surface topography. Both in scratch and reciprocal sliding testing against alumina, the friction coefficients are lower for the smooth coatings, but their wear rate is higher due to low-cycle fatigue caused abrasion.
    Celem pracy jest badanie wpływów szorstkości na zużycia abrazyjne osadzonych magnetronowo wielowarstwowych powłoki o niskim współczynniku tarcia na bazie wzmocnionych włóknami węglowych polimerów (CFRP). Większa szorstkość powłoki przy podobnej jakości (CFRP) została uzyskana przez wyższe szybkości osadzania, co prowadziło do zwiększonego strumienia ciepła do podłoża podczas osadzania. Rozszerzalność cieplna matrycy epoksydowej w skali mikro pozwalała na uzyskanie falistej, pofałdowanej topografii powierzchni. Zarówno w teście zarysowania jak i ścierania z przeciwpróbką korundową uzyskano niższe współczynniki tarcia dla gładkich powierzchni zaś ich szybkość zużycia była wyższa ze względu na nisko-cyklowe zmęczenie wywołujace przetarcie.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 3; 2145-2151
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Biomechanical properties of the thin PVD coatings defined by red blood cells
    Autorzy:
    Trembecka-Wojciga, K.
    Major, R.
    Lackner, J. M.
    Bruckert, F.
    Jasek, E.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/201364.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomechanical properties
    thin PVD coatings
    red blood cells
    właściwości biomechaniczne
    cienkie powłoki PVD
    krwinki czerwone
    Opis:
    The measurement of the strength of bonds between biomaterials and cells is a major challenge in biotribology since it allows for the identification of different species in adhesion phenomena. Biomaterials, such as diamond-like carbon (DLC), titanium, and titanium nitride, seem to be good candidates for future blood-contact applications. These materials were deposited as thin films by the hybrid pulsed laser deposition (PLD) technique to examine the influence of such surfaces on cell behavior. The biomaterial examinations were performed in static conditions with red blood cells and then subjected to a dynamical test to observe the cell detachment kinetics. The tests revealed differences in behavior with respect to the applied coating material. The strongest cell-biomaterial interaction was observed for the carbon-based materials compared to the titanium and titanium nitride. Among many tests, a radial flow interaction analysis gives the opportunity to analyze cell adhesion to the applied material with the high accuracy. Analysis of concentrates helped to select materials for further dynamic tests on blood using an aortic flow simulator. In this case, the platelet adhesion to the surface and their degree of activation was analyzed. The quality of the selected coating was tested using a scratch test. The analyses of the microstructure were done using high resolution transmission electron microscopy. The phase composition and the residual stress were analyzed using X-ray diffraction methods.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 3; 697-705
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    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:
    Migration channels produced by laser ablation for substrate endothelialization
    Autorzy:
    Major, R.
    Maksymow, K.
    Marczak, J.
    Lackner, J.
    Kot, M.
    Major, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/201285.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    inorganic coatings
    pulsed laser ablation
    tissue scaffold
    endothelial cells migration
    Opis:
    Seeding of cells on functional, biocompatible scaffolds is a crucial step in achievement the desired engineered tissue. In the present study, a pulsed laser modification onto inorganic substrate was made to promote endothelium cells migration and spread. Presented scaffolds were fabricated on carbon and titanium based coatings. Fabricated films provided very good mechanical properties together with a chemical stability preservation. The substrate modification consisted of grid-like template fabrication of micrometer size meshes. The microstructure analysis of laser traces revealed the grain size increase in the zone of laser beam interaction, which exerts an influence on a surface topography. Endothelium cells locomotion was observed within 10 day time period. As a result it was shown that the modified area enhanced cells adhesion with a preferred static behavior. The performed research work improved our understanding on the pulsed laser ablation process and template size influence on cells spatial arrangement. It constituted an important step towards fabrication of inorganic, biocompatible scaffolds for successful substrate endothelialization.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 2; 337-342
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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