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    Wyświetlanie 1-7 z 7
    Tytuł:
    Microstructure Characterization of Composite from ZrO2 – Ti System
    Autorzy:
    Łada, P.
    Miazga, A.
    Bazarnik, P.
    Konopka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/354416.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    titanium
    zirconium oxide (ZrO2)
    composite
    stereology
    Opis:
    In this work the microstructure analysis of composite from ZrO2 – Ti system were presented. For the preparation of the composite samples nanometric ZrO2 powder stabilized by 3 mol% of Y2O3 and micrometric titanium powder were used. The composites with 10 vol.% addition of titanium particles were prepared by slip casting method. The sintering process was conducted at 1450°C with 2 hours’ dwell time, in the inert atmosphere of argon. The microstructure observations were carried out with the use of SEM and STEM microscopes. The quantitative analysis and stereological characterization were performed. The SEM and STEM observations allowed characterizing the microstructure of composite samples. Especially, the interface between titanium particles and zirconia matrix was described. The growth of the zirconia grains around the Ti rich areas was observed. The increase of the zirconia grains size results from the reaction on the interface between titanium particle and zirconia matrix during the sintering process.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2045-2049
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication of ZrO2-Ti Composites by Slip Casting Method
    Autorzy:
    Łada, P.
    Falkowski, P.
    Miazga, A.
    Konopka, K.
    Szafran, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351354.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ceramic-metal composite
    titanium
    zirconium oxide
    slip-casting
    Opis:
    Slip casting is one of the most popular shaping method in ceramic technology which allows producing a large number of elements in small period of time. This shaping technique gives a possibility to fabricate ceramic or composite materials such as ZrO2-Ti. Ti with its properties (low density, high melting point, high-temperature strength, good corrosion resistance and others) combine with ZrO2 (high flexure strength, high compression resistance and very high KIC) can be considered for different applications as constructional and functional materials. For the preparation of such composite nanometric zirconium oxide powder stabilized by 3 mol% Y2O3 and micrometric titanium powder were used. Water-based slurries with 35, 40, 45 and 50 vol.% solid phase content were prepared with 3, 10 and 15 vol.% addition of titanium powder. Zeta potential and pH of prepared slurries were considered. The pH changes were tested as a function of Ti content. The viscosity of the prepared slurries was measured. The sedimentation tests for selected slurries were performed. The casting rate for slurry of 35% solid phase with 10 vol.% Ti was examined. These measurements showed good stability of slurries. With the increasing of the solid phase concentration the density of the green bodies increased. However, the increase of the content of Ti powder reduced the density of green body samples. For selected samples the SEM observations was carried out. Composites produced by slip casting were characterized by a homogenous distribution of Ti particles in the ZrO2 matrix.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2B; 1095-1100
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Full Contoured Tooth-Implant Supported 3-Pointic All-Ceramic Denture During Occlusal Load Transfer in Lateral Region
    Autorzy:
    Żmudzki, J.
    Malara, P.
    Chladek, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/356267.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    biomaterials
    denture
    zirconium oxide
    titanium implant
    bone tissue
    Opis:
    Implant and a tooth supported dentures are avoided by dentists because of uneven distribution of occlusal loads between a stiffer implant and a more pliable tooth. The hypothesis was that a 3-point all-ceramic bridge supported on a natural second premolar tooth and a two-pieces typical implant bears safely mastication loads. The finite element analysis showed that the implant splinted by all-ceramic zirconium bridge with the second premolar was safe under lateral mastication load, but there was found an overload at wide zone of bone tissue around the implant under the load of 800 N. The patients can safely masticate, but comminution of hard food should be avoided and they should be instructed that after such an indiscretion they need to contact a dental professional, because, in spite of integrity of the prosthesis, the bone tissue around the implant may fail and there is a hazard of intrusion of the tooth.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 843-846
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Optical and Mechanical Characterization of Zirconium Based Sol-Gel Coatings on Glass
    Autorzy:
    Sitarz, M.
    Drajewicz, M.
    Jadach, R.
    Długoń, E.
    Leśniak, M.
    Reben, M.
    Wajda, A.
    Gawęda, M.
    Burtan-Gwizdała, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/352458.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sol-gel coating
    zirconium oxide
    ellipsometry
    Vickers hardness
    Opis:
    The basic factor limiting the use of glasses is their unsatisfactory mechanical strength. The improvement of the mechanical strength of glasses is usually obtained by applying their respective thin surface layers. The object of the research was glass coated with zirconium oxide. For the application of zirconium oxide layer, dip-coating method was used. The resulting materials were subjected to detailed examination of the microstructure (SEM), and mechanical tests (Vickers hardness and modulus of elasticity). In order to evaluate the optical characteristics, the tests were performed by UV/VIS. The thickness of the overlying layers were determined using the method of ellipsometry. The study showed that the obtained sol-gel layer of zirconium oxide (IV) on glasses influence the improvement of the mechanical properties. It has been shown that the applied layers have high adhesion to the substrate.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 1747-1752
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of magnesia-doped yttria-stabilized zirconia powders for dental technology applications
    Autorzy:
    Nakonieczny, D.
    Walke, W.
    Majewska, J.
    Paszenda, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/307056.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    stomatologia
    protetyka
    materiały protetyczne
    metoda zol-żel
    full ceramic restorations
    prosthetic dentistry
    sol-gel method
    Zirconium Oxide
    Opis:
    Purpose: This paper is focused on the works concerning on preparing zirconium oxide ceramic blocks recommended for CAD/CAM systems used in prosthetic dentistry for manufacturing fixed prosthetic restorations. Methods: Zirconium-yttrium-magnesium mixed ceramic oxides were prepared by sol-gel method via hydrolysis and condensation of zirconium alkoxide precursor (zirconium (IV) propoxide) with yttrium and magnesium nitrates diluted in 2-propanol. The aim of this work it was to obtain 2% mol yttria stabilized zirconia ceramic powders with magnesium as an additional tetragonal ZrO2 phase stabilizer in amount between 2÷6% mol (with 2% variable). Prepared gels were dried (24 h in 65°C). Obtained powders were mixed with binder (carboxymethyl cellulose) and uniaxial pressed in to a specimens with diameter 38 x 22 x 6 mm. Afterwards green bodies were sintered in range of temperature between 1350-1550°C. Powders and blocks were characterized by Scanning Electron Microscopy, Fourier Transform Infrared Spectroscopy, Specific Area Measurement. Results: Highly homogeneous powders with a low open porosity, was obtained. Prepared blocks after sintering showed numerous cracks. Nevertheless blocks was fine grained and show quite reproducible chemical composition. Conclusion: A sol gel wet chemical route of powder synthesis allow to obtain high homogenous ceramic materials with inconsiderable amount of pores with low variation in a diameter. In spite of a reproducible synthesis methods of a ceramic powders, applied to prepare green bodies procedure and sintering manner do not allowed to obtain free from cracks zirconia ceramics blocks.
    Źródło:
    Acta of Bioengineering and Biomechanics; 2014, 16, 4; 99-106
    1509-409X
    2450-6303
    Pojawia się w:
    Acta of Bioengineering and Biomechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal and mechanical characterization of zirconium based LPPS coatings on glass
    Charakterystyka właściwości cieplnych i mechanicznych warstw ZrO2 wytworzonych na powierzchni szkła
    Autorzy:
    Drajewicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/175939.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    plasma spray
    zirconium oxide
    thermal diffusivity
    Vickers hardness
    LPPS method
    layer
    natrysk plazmowy
    tlenek cyrkonu
    dyfuzyjność cieplna
    twardość Vickersa
    metoda LPPS
    warstwa
    Opis:
    The basic factor limiting the use of glasses is their unsatisfactory mechanical strength. The improvement of the mechanical strength of glasses is usually obtained by applying their respective thin surface layers. The object of the research was glass coated with zirconium oxide. For the application of zirconium oxide layer, LPPS (Low Pressure Plasma Spraying) method was used. The resulting materials were subjected to detailed examination of the thermal properties (cp-DSC, dilatometer, laser flash analysis), and mechanical tests (Vickers hardness and modulus of elasticity). The study showed that the obtained LPPS layer of zirconium oxide (IV) on glasses influence the improvement of the mechanical properties. It has been shown that the applied layers have high adhesion to the substrate.
    Właściwości mechaniczne szkła decydują o ich rozwoju i zastosowaniu w technice. Ograniczają jednak często wciąż ich właściwości użytkowe. Szczególnie dotyczy to właściwości, które zależą od składu fazowego i budowy warstwy wierzchniej szkła. Stąd poprawę tych właściwości szkła, zwłaszcza wytrzymałościowych, obecnie uzyskuje się przez modyfikowanie ich warstwy wierzchniej lub konstytuowanie nowej warstwy na podłożu szkła, m.in przez wytworzenie cienkiej warstwy tlenkowej metodami inżynierii powierzchni. W niniejszej pracy przyjęto założenie, że zastosowanie stabilizowanego tlenku ZrO2 w procesie fizycznego osadzania z fazy gazowej w warunkach obniżonego ciśnienia pozwoli na wytworzenie stabilnej warstwy wierzchniej na podłożu szkła. Założono, że wytworzona warstwa zapewni również zwiększenie efektu umocnienia szkła krzemianowo – sodowo – wapiennego. Wykonano pomiary właściwości cieplnych i wytrzymałościowych oraz przeprowadzono analizy uzyskanych wyników.
    Źródło:
    Advances in Manufacturing Science and Technology; 2017, 41, 4; 31-40
    0137-4478
    Pojawia się w:
    Advances in Manufacturing Science and Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamic Charge Carrier Transport Behaviors in Zirconium Oxide for Nuclear Cladding Materials
    Autorzy:
    Park, Il-Kyu
    Lee, Sang-Seok
    Mok, Yong Kyoon
    Jeon, Chan-Woo
    Kim, Hyun-Gil
    Powiązania:
    https://bibliotekanauki.pl/articles/351043.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    zirconium
    nuclear cladding
    Zr oxide
    capacitance-voltage
    current-voltage
    Opis:
    Dynamic charge carrier transport behavior in the zirconium (Zr) oxide was investigated based on the frequency-dependent capacitance-voltage (C-V) and temperature-dependent current-voltage (I-V) measurements. The Zr oxide was formed on the ZIRLO and newly developed zirconium-based alloy (NDZ) by corrosion in the PWR-simulated loop at 360°C. The corrosion test for 90 days showed that the NDZ exhibits better corrosion resistance than ZIRLO alloy. Based on the C-V measurement, dielectric constant values for the Zr oxide was estimated to be 11.28 and 11.52 for the ZIRLO and NDZ. The capacitance difference between low and high frequency was larger in the ZIRLO than in the NDZ, which was attributed to more mobile electrical charge carriers in the oxide layer on the ZIRLO alloy. The current through the oxide layers on the ZIRLO increased more drastically with increasing temperature than on the NDZ, which indicating that more charge trap sites exist in the ZIRLO than in NDZ. Based on the dynamiccharge carrier transport behavior, it was concluded that the electrical charge carrier transport within the oxide layers was closely related with the corrosion behavior of the Zr alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 3; 1063-1067
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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