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    Wyświetlanie 1-6 z 6
    Tytuł:
    Study of factors determinant of siliceous electrical porcelain resistance to structural degradation
    Autorzy:
    Ranachowski, P.
    Ranachowski, Z.
    Kudela Jr., S.
    Pawełek, A.
    Piątkowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/351813.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    porcelain insulating materials
    ageing processes
    acoustic emission (AE)
    optical microscopy
    Opis:
    The subject of this study was investigation of the factors that have a decisive influence on the resistance of siliceous porcelain to degradation processes. There was tested material C 110 type, which is widely used for the production of low-voltage (LV) elements such as insulators and bushings. On the basis of mechanical-acoustic and microscopic research of small-sized samples, which were subjected to compression, there were distinguished successive stages of degradation of the material structure. In the authors* opinion, they have a reference to the ageing process, taking place during many years of work under operating conditions. Thus, it was possible to assess the structural factors that determine the durability and reliability of LV electroinsulating elements. The results were related to electrical aluminous porcelains.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1489-1496
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Modified Aluminous Porcelain Subjected to Mechanoacoustic Tests
    Autorzy:
    Ranachowski, P.
    Ranachowski, Z.
    Wieczorek, K.
    Jaroszewski, M.
    Kudela, S. jr.
    Powiązania:
    https://bibliotekanauki.pl/articles/355059.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    electrical porcelain materials
    ageing processes
    acoustic emission
    AE
    optical microscopy
    Opis:
    The paper presents the microscopic and mechanoacoustic study of degradation processes of the porcelain material C 130 type. This kind of material is used in the production of the most durable and reliable electrotechnical elements. Raw material composition of the studied porcelain was modified. This had an impact on the inner properties, cohesion and – in consequence – on operational properties of the material. Using mechanical-acoustic and microscopic methods of testing of small-size samples that were subjected to compression, it was possible to distinguish successive stages of degradation of the porcelain structure. These stages were generally typical of the porcelain materials. In the authors’ opinion, they are connected to the ageing process happening over many years of work under operating conditions. Optimization of composition and technological properties – important during technological processes – resulted in a slight decrease in inner cohesion of the porcelain. When compared to the reference material – typical domestic C 130 material, mechanical strength was somewhat lower. Carried out investigations proved that resistance of the investigated material to the ageing degradation process – during long term operation – also decreased. The improvement of technological parameters and the reduction in the number of defective elements occurred simultaneously with some decrease in the operational parameters of the material. To restore their initial high level, further work is needed to optimize the raw material composition of the porcelain.
    Źródło:
    Archives of Metallurgy and Materials; 2018, 63, 4; 1821-1826
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Structures Assessment of Some TRIP Steels
    Autorzy:
    Pantilimon, Mircea Cristian
    Berbecaru, Andrei-Constantin
    Coman, George
    Sohaciu, Mirela G.
    Dumitrescu, Ruxandra Elena
    Ciucă, Sorin
    Gherghescu, Ioana-Arina
    Predescu, Cristian
    Powiązania:
    https://bibliotekanauki.pl/articles/27313868.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    TRIP steel
    optical microscopy
    Vickers hardness
    retained austenite
    car body material
    Opis:
    Automotive industry is constantly interested in building cars made of light and high strength parts in order to reduce the emission levels, the fuel consumption and minimize the effects of a car crash. Some parts may be made of lighter materials, but the steel ones must compensate the strength needed for the car body. Research is made for finding new materials showing high strength combined with high ductility. Among them, transformation - induced - plasticity steels are of great interest, efforts being made to improve their characteristics. A new composition of such a steel is presented, its features being compared with those of three other steels of the same class and category. Optical microscopy at different magnifications is performed, together with Vickers hardness test. Structural particularities are found for each tested steel, justified by their own chemical compositions. The new steel reveals important characteristics: besides the mainly bainitic structure, it has both larger ferritic areas and amounts of retained austenite, making him proper for further study.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 2; 491--498
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Statistical Assessment of the Microstructure of Barite Aggregate from Different Deposits Using X-Ray Microtomography and Optical Microscopy
    Autorzy:
    Żołek, N.
    Ranachowski, Z.
    Ranachowski, P.
    Jóźwiak-Niedźwiedzka, D.
    Kudela, S. jr.
    Dvorak, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/351890.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    barite ore
    barite aggregate
    microstructure
    optical microscopy
    thin sections analysis
    X-ray tomography
    Opis:
    Two different barite ore (barium sulfate BaSO4) specimens from different localizations were tested and described in this paper. Analysis of the microstructure was performed on polished sections, and on thin sections using X-ray microtomography (micro-CT), and optical microscopy (MO). Microtomography allowed obtaining three-dimensional images of the barite aggregate specimens. In the tomograms, the spatial distribution of the other polluting phases, empty space as well as cracks, pores, and voids – that exceeded ten micrometers of diameter-were possible to visualize. Also, the micro-CT allowed distinguishing between minerals of different density, like SiO2 and BaSO4. Images obtained and analyzed on thin sections with various methods using the optical microscopy in transmitted light delivered additional information on the aggregate microstructure, i.e. allow for estimation of the different kinds of inclusions (like the different density of the minerals) in the investigated specimens. Above methods, which were used in the tests, completed each another in order to supply a set of information on inclusions’ distribution and to present the important differences of the barite aggregate specimens microstructure.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 697-702
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photosensitization of TiO2 P25 with CdS Nanoparticles for Photocatalytic Applications
    Autorzy:
    Trenczek-Zając, A.
    Banaś, J.
    Świerczek, K.
    Zazakowny, K.
    Radecka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352507.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    semiconductors
    X-ray diffraction
    transmission electron microscopy TEM
    catalytic properties
    optical properties
    Opis:
    A TiO2/CdS coupled system was prepared by mixing the TiO2 P25 with CdS synthesized by means of the precipitation method. It was found that the specific surface area (SSA) of both components is extremely different and equals 49.5 for TiO2 and 145.4 m2·g-1 for CdS. The comparison of particle size distribution and images obtained by means of transmission electron microscopy (TEM) showed agglomeration of nanocomposites. X-ray diffraction (XRD) patterns suggest that CdS crystallizes in a mixture of cubic and hexagonal phases. Optical reflectance spectra revealed a gradual shift of the fundamental absorption edge towards longer wavelengths with increasing CdS molar fraction, which indicates an extension of the absorption spectrum of TiO2. The photocatalytic activity in UV and UV-vis was tested with the use of methyl orange (MO). The Langmuir–Hinshelwood model described well the photodegradation process of MO. The results showed that the photocatalytic behaviour of the TiO2/CdS mixture is significantly better than that of pure nanopowders.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 2A; 841-849
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of the structure of archeological objects - ceramic pottery
    Analiza struktury obiektów archeologicznych - naczyń ceramicznych
    Autorzy:
    Riegert, D.
    Konopka, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/354078.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    glina
    domieszki
    naczynie ceramiczne
    mikroskopia stereoskopowa
    pottery
    clay
    admixtures
    stereoscopic microscopy
    optical profilometry
    Opis:
    The aim of the present study was to check whether the research methods used in materials engineering could be useful for examining archeological ceramic pottery. The experiments were conducted with the use of stereoscopic microscopy, scanning electron microscopy, and optical profilometry. The examined material included pieces of the archeological clay vessels excavated from various sites and dated at two various historical periods. The first group includes samples from the 5th century B.C. from Biehla (Germany) and Starosiedle (Poland), the second group consists of fragments of vessels of the 10th century A.D. from Starosiedle (Poland) and Rosenhof (Germany). The structure of the matrix and the mineral admixtures distributed throughout it were analyzed on the cross-sections of the archeological material. The examinations were performed using the fractographic method and optical profilometery, which permitted determine the shapes and morphology of the admixtures, examine their embedding in the matrix material (clay), and also revealing possible layers or delaminations within the matrix.
    Głównym celem pracy przedstawionej w artykule było wykorzystanie metod badawczych stosowanych w inżynierii materiałowej do badania ceramiki archeologicznej. Do badań zastosowano mikroskopię stereoskopową, skaningową mikroskopię elektronową oraz profilometrię optyczną. Materiałem do badań były fragmenty glinianych naczyń archeologicznych pochodzęcych z róznych okresów historycznych i z różnych miejsc, odpowiednio: Biehla i Starosiedle - V w. p.n.e.; Starosiedle i Rosenhof - × w. Analizie poddana była budowa osnowy oraz rozmieszczone w niej domieszki mineralne. W tym celu zastosowano badania faktograficzne i badania przy uzyciu profilometru optycznego powierzchni płaskich powstałych w wyniku cięcia materiału archeologicznego. Badania te pozwoliły na obserwację kształtu, morfologii domieszek, a także stopnia "obtoczenia" ich przez material osnowy — glinę, oraz obecności warstw i rozwarstwień w osnowie.
    Źródło:
    Archives of Metallurgy and Materials; 2011, 56, 1; 163-170
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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