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    Tytuł:
    Glassy Carbon Coating Deposited on Hybrid Structure of Composite Materials
    Autorzy:
    Posmyk, A.
    Myalski, J.
    Hekner, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/351876.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid composite
    glassy carbon
    ceramic foam
    solid lubricant
    wear
    Opis:
    This paper presents a method of production metal matrix composites with aluminum oxide foam covered by glassy carbon layer used as reinforcement. The glassy carbon coating was formed for decreasing of friction coefficient and reducing the wear. In first step of technology liquid glassy carbon precursor is on ceramic foam deposited, subsequently cured and carbonated at elevated temperature. In this way ceramic foam is covered with glassy carbon coating with thickness of 2-8 μm. It provides desirable amount of glassy carbon in the structure of the material. In the next step, porous spheres with carbon coating are infiltrated by liquid matrix of Al-Cu-Mg alloy. Thereby, equable distribution of glassy carbon in composite volume is achieved. Moreover, typical problems for composites reinforced by particles like sedimentation, agglomeration and clustering of particles are avoided. Tribological characteristics during friction in air versus cast iron as a counterpart were made. Produced composites with glassy carbon layer are characterised by friction coefficient between 0.08-0.20, thus meeting the typical conditions for solid lubricants.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1045-1050
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Development of Superior Thermal Protective Coating on Carbon Composites
    Autorzy:
    Bae, Soo Bin
    Lee, Ji Eun
    Paik, Jong Gyu
    Cho, Nam Choon
    Lee, Hyung Ik
    Powiązania:
    https://bibliotekanauki.pl/articles/354076.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composite
    silicon carbide
    CVR
    CVD
    Opis:
    A superior SiC based thermal protection coating process for carbon composite, which can be especially effective in a hot oxidizing atmosphere, was established in this study. A multi-coating process based on a combination of Chemical Vapor Reaction (CVR) and Chemical Vapor Deposition (CVD) was developed. Various protective coating layers on carbon composite were tested in hot oxidizing surroundings and the test results verified that the thermal ablation rate could be dramatically reduced down to 3.8% when the protective multi-coating was applied. The thermal protection mechanism of the coating layers was also investigated.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1371-1375
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of SiC Coating of Carbon Fiber on Mechanical Properties in Short Carbon Fiber Reinforced Al Matrix Composite
    Autorzy:
    Jang, Jin Man
    Ko, Se-Hyun
    Lee, Wonsik
    Powiązania:
    https://bibliotekanauki.pl/articles/2049151.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    short carbon fiber
    Al composite
    SiC coating
    mechanical property
    Opis:
    A356 Al composites reinforced by short carbon fiber were prepared through the 2-step process: fabrication of a composite precursor and ultrasonication of the precursor melt. The short carbon fibers were coated with 0.15~1.5 μm thick SiC layer by a car-bothermal reaction, and an amount of the carbon fiber reinforcement was determined to be 1.5 vol.% and 4.0 vol.%, respectively. The addition of the carbon fiber increased the hardness of A356 alloy. However, tensile strength did not increase in the as-cast composites regardless of the SiC coating and volume fraction of the carbon fiber, due to the debonding which reduced load transfer efficiency from matrix to fiber at the interface. After T6-treatment of the composites, a significant increase in strength occurred only in the composite reinforced by the SiC-coated short carbon fiber, which was considered to result from the formation of a precipitate improving the Al/SiC interfacial strength.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 4; 941-946
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluating the Durability of SiC-Coated Carbon Composites Under Thermal Shock Conditions
    Autorzy:
    Lee, Ji Eun
    Bae, Soo Bin
    Cho, Nam Choon
    Lee, Hyung Ik
    Meng, Zicheng
    Lee, Kee Sung
    Powiązania:
    https://bibliotekanauki.pl/articles/2049309.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    durability
    carbon composites
    silicon carbide coating
    chemical vapor deposition
    chemical vapor reaction
    Opis:
    Oxidation and indentation properties of silicon carbide-coated carbon composites were investigated to analyze its durability under atmospheric thermal shock conditions. The silicon carbide-coated samples were prepared either with chemical vapor deposition or chemical vapor reaction/chemical vapor deposition hybrid coating. The remnant weight of uncoated and coated samples was investigated after each thermal shock cycle. The surface and cross-section of coated samples were then analyzed to confirm morphological changes of the coating layers. The spherical indentation test for uncoated and coated samples were also performed. As a result, silicon carbide coating improved the oxidation resistance, elastic modulus, and hardness of carbon composites. Hybrid coating drastically enhanced the durability of samples at high temperature in atmospheric conditions.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 3; 777-782
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research of Zinc Coatings in Thin Medium Carbon Steel Wires
    Autorzy:
    Suliga, M.
    Wartacz, R.
    Kania, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/356515.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wire
    zinc coating
    drawing speed
    mechanical properties
    Opis:
    An analysis of the effect of drawing speed on the formation of a zinc coating in the multi-stage fine steel wire drawing process has been carried out in the article. Pre-hardened 2.2 mm-diameter material was drawn into 1.00 mm-diameter wire in 6 draws on a multi-stage drawing machine. The drawing process was carried out at a drawing speed of 5, 10, 15, 20 and 20 m/s, respectively. Mechanical tests were tests were performed for the final wires to determine their yield strength, ultimate tensile strength, uniform and total elongation and reduction in area. The thickness of the zinc coating on the wire surface was determined by the gravimetric method and based on metallographic examination. The use of electron scanning microscopy, on the other hand, enabled the identification of individual phases in the zinc coating. The above investigations were supplemented with corrosion testing of 1.00 mm-diameter wires. It has been demonstrated that drawing speed significantly influences not only the thickness of the zinc coating on the drawn wire surface, buts also its morphology and corrosion resistance.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 413-420
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Process Parameters on the Microstructure of a Hardfacing Coating Elaborated by Hot Isostatic Pressing
    Autorzy:
    Tellier, A.
    Ardigo-Besnard, M. R.
    Chateau-Cornu, J.-P.
    Powiązania:
    https://bibliotekanauki.pl/articles/355976.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    powder metallurgy
    hot isostatic pressing
    high carbon steel
    microstructure
    hardfacing coating
    Opis:
    Hot Isostatic Pressing elaboration of Norem02, an austenitic-ferritic hypereutectoid stainless steel, leads to the formation of an austenitic matrix with a mixture of acicular M7 C3 and globular M23 C6 carbides. The sintering tests, carried out by using an AISI 304L container, showed that the final microstructure and the carbides’ distribution of the HIPed Norem02 are strongly influenced by the process parameters (heating and cooling rate, sintering time, holding temperature and pressure) and by the particles’ size, microstructure and phase distribution of the initial powder. The morphological, crystallographic and chemical analysis of the sintered samples were completed by comprehension of the diffusion phenomena at the Norem02/304L interface, enabling the establishment of a correlation between elaboration process and final microstructure.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 33-38
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Structure and properties of diamond-like carbon films deposited by pacyd technique on light alloys
    Autorzy:
    Tański, T.
    Labisz, K.
    Krupiński, M.
    Lukaszowicz, K.
    Krzemiński, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/351785.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    DLC
    coating
    PACVD
    magnesium
    HRTEM
    Opis:
    The investigations presented in this paper describe surface treatment performed on samples of heat-treated cast magnesium and aluminium alloy. The structure and chemical composition as well as the functional and mechanical properties of the obtained gradient/monolithic films were analysed by high resolution transmission electron microscopy and scanning electron microscopy, Raman spectroscopy, die ball-on-disk tribotester and scratch testing. Moreover, investigation of the electrochemical corrosion behaviour of the samples was carried out by means of potentiodynamic polarisation curves in 1-M NaCl solution. The coatings produced by chemical vapour deposition did not reveal any delamination or defects and they adhere closely to the substrate. The coating thickness was in a range of up to 2.5 microns. Investigations using Raman spectra of the DLC films confirmed a multiphase character of the diamond-like carbon layer, revealing the sp and sp3 electron hybridisation responsible for both the hardness and the friction coefficient. The best wear resistance test results were obtained for the magnesium alloy substrate - AZ61, for which the measured value of the friction path length was equal to 630 m.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1321-1330
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Composite layers with ceramic matrix modified with glassy carbon destined for oil-less sliding pairings
    Warstwy kompozytowe z osnową ceramiczną modyfikowane węglem szklistym przeznaczone na skojarzenia bezolejowe
    Autorzy:
    Posmyk, A.
    Wistuba, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/352687.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    warstwa kompozytowa
    nanorurki węglowe
    smarowanie
    anodowa powłoka twarda
    composite layer
    carbon nanotubes
    sliding
    lubrication
    anodic hard coating
    Opis:
    The paper presents basic knowledge about producing and some results of tribological and metallographical research on composite layers with porous, anodic hard coating matrix which were modified with glassy carbon nanotubes. These composite layers were formed as surface layers of machine parts operating under conditions of sparse lubrication (limited lubrication) and friction in air. The layers were tested at sliding mating with EN-GJL-350 cast iron used for piston rings in combustion engines and air compressors. On the basis of the metallographical tests was the structure of the composite layer described. It was fount that on the surface of the oxide is a glassy carbon layer and in the pores of oxide are regullary carbon nanotubes. On the basis of the obtained results of tribological tests it was found that glassy carbon layer on the oxide surface shorts the wering-in time, and the glassy carbon nanotubes formed inside the pores of anodic hard coating upon EN-AW-6061 aluminum alloy prove to be effective solid lubricants and complement lubrication function of the graphite in cast iron. Consequently the coefficient of friction was lower than in case of nanotubes-free oxide layers.
    W pracy przedstawiono podstawy wytwarzania oraz wyniki badan metalograficznych i tribologicznych warstw kompozytowych na osnowie porowatej, anodowej warstwy tlenkowej modyfikowanej weglem szklistym. Warstwy te zostały wytworzone jako warstwy powierzchniowe czesci maszyn współpracujacych slizgowo w warunkach ograniczonego smarowania (oszczednego) oraz w warunkach tarcia technicznie suchego. Warstwy te zostały przebadane we współpracy slizgowej z zeliwem EN GJL 350 uzywanym na pierscienie tłokowe silników spalinowych i tłokowych sprezarek powietrza. Na podstawie przeprowadzonych badan metalograficznych okreslono budowe i strukture warstw kompozytowych, stwierdzajac ze na powierzchni tlenku wytwarza sie warstewka wegla szklistego, a wewnatrz porów sa regularne nanorurki weglowe. Na podstawie badan tribologicznych stwierdzono, ze znajdujaca sie na powierzchni warstewka wegla szklistego skraca czas docierania skojarzenia a nanorurki weglowe wytworzone w porach anodowej warstwy tlenkowej na stopie aluminium EN-AW-6061 sa skutecznym srodkiem smarowym i wspomagaja funkcje smarne grafitu znajdujacego sie w zeliwie. Współczynnik tarcia w skojarzeniu z warstwa kompozytowa był mniejszy niz w skojarzeniu z warstwa tlenkowa.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 4; 909-917
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Angle of Working Part of Die on the Zinc Coating Thickness and Mechanical Properties of Medium Carbon Steel Wires
    Autorzy:
    Suliga, M.
    Wartacz, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/352577.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wire
    die angle
    hot dip galvanizing
    mechanical properties
    Opis:
    The paper discusses experimental studies to determine the effect of the die working portion angle on the lubrication conditions, zinc coating thickness and the mechanical properties of medium-carbon steel wires. The test material was 5.5 mm-diameter wire rod which was drawn into 2.2 mm-diameter wire in seven draws at a drawing speed of v = 10 m/s. Conventional drawing dies of a working portion angle of α = 3, 4, 5, 6, 7°, respectively, were used for the drawing process. After the drawing process, the quantity of the lubricant on the wire surface and the thickness of the zinc coating were determined in individual draws. Testing the finished 2.2 mm-diameter wires for mechanical properties, on the other hand, determined the effect of the die working portion on the yield point, tensile strength, uniform and total elongation, reduction in area, the number of twists and the number of bends.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 4; 1295-1299
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Improvement of Microstructure and Barrier Properties of Silicate Coatings on Low Carbon Steel by Incorporating Colloidal Nano-SiO2
    Autorzy:
    Majdi, M. R.
    Danaee, I.
    Zaarei, D.
    Farzam, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/355960.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    colloidal nano-SiO2
    silicate coating
    corrosion
    AFM
    ATR-FTIR
    Opis:
    Silicate coatings have been considered as an alternative to toxic and carcinogenic other chemical treatments. In this paper, a strengthened silicate coating was formed on the surface of low carbon steel by dip immersion method. The modification and strengthening was done by loading colloidal nano-SiO2 into the film. The characterizations of nano-SiO2 were investigated by FESEM, TEM and FT-IR. The effects of nano contents (weight ratio) and drying temperatures on corrosion properties of silicate film were studied. Potentiodynamic polarization, electrochemical impedance spectroscopy and immersion tests have been used to study corrosion behavior of nano-loaded silicate films. Surface morphology, microstructure and its chemical composition were analyzed by means of FESEM, EDS, AFM, XRD, GIXRD, ATR-FTIR and Raman techniques. Results indicated that colloidal nano-SiO2 properly modified the silicate coatings and significantly improved the corrosion resistance and barrier property. Also drying temperature showed a considerable effect in silicate coating and higher corrosion resistance was obtained with 150°C curing.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 2; 627-638
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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