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    Wyświetlanie 1-9 z 9
    Tytuł:
    Band reactor for toxic and recalcitrant water contaminants
    Autorzy:
    Czech, B.
    Ćwikła-Bundyra, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/778635.pdf
    Data publikacji:
    2007
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    fotokataliza
    fotoreaktor
    Me-TiO2/Al2O3
    oczyszczanie ścieków
    fenol
    formaldehyd
    photocatalysis
    photoreactors
    wastewater treatment
    phenol
    formaldehyde
    Opis:
    This paper deals with the problem of the photocatalytic reactor construction. The supported TiO2 on γ-Al2O3 modified with Mo or V addition was used as the photocatalyst, whereas phenol and formaldehyde were chosen as the model pollutants. The counter - current contact of reagents and catalysts is the main advantage of the construction and enables a significant COD reduction of the highly concentrated wastewaters.
    Źródło:
    Polish Journal of Chemical Technology; 2007, 9, 4; 18-20
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pogłębione utlenianie związków powierzchniowo czynnych w ściekach
    Advanced photooxidation of surfactants in wastewater
    Autorzy:
    Czech, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1207466.pdf
    Data publikacji:
    2012
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Przemysłu Chemicznego. Zakład Wydawniczy CHEMPRESS-SITPChem
    Tematy:
    fotokataliza
    TiO2/Al2O3
    AOP
    surfaktanty
    H2O2
    photocatalysis
    surfactants
    Opis:
    W niniejszej pracy zastosowano metody fotokatalityczne do usuwania Tritonu X-100 i płynu do mycia naczyń ze ścieków. Jako fotokataliza ta użyto TiO2 naniesionego na Al2O3. Fotokatalizatory były modyfikowane dodatkiem Cu lub Zn za pomocą metod Klasycznej i Podwójnej Impregnacji. Materiały fotokatalityczne poddano charakterystyce fizykochemicznej za pomocą adsorpcji-desorpcji N2, XRF, XRD, SEM-EDX, spektroskopii Ramana i UV-Vis. Wszystkie katalizatory wykazały się skutecznością w usuwaniu badanych surfaktantów. Dodatek H2O2 (0.01obj.%) nie spowodował polepszenia skuteczności oczyszczania. Najlepsze wyniki uzyskano w czasie pierwszych dwóch godzin oczyszczania.
    Photocatalytic methods were applied to remove Triton X-100 and wash-up liquid from wastewater. For the studies Al2O3 supported TiO2 photocatalysts were used. They were modified with Cu or Zn using Classical or Double Impregnation Method. Photocatalytic materials were characterised by N2 adsorption-desorption, XRF, XRD, SEM-EDX, Raman and UV-Vis spectroscopy. All the catalysts were efficient in the removal of surfactants. The addition of H2O2 (0.01vol.%) does not deepen the removal of studied pollutants. The best results were obtained during first two hours of treatment.
    Źródło:
    Chemik; 2012, 66, 12; 1314-1325
    0009-2886
    Pojawia się w:
    Chemik
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructure of Al2O3-13TiO2 coatings deposited from nanoparticles by plasma spraying
    Mikrostruktura powłok Al2O3-13TiO2 natryskanych plazmowo z nanocząstek
    Autorzy:
    Góral, A.
    Lityńska-Dobrzyńska, L.
    Żórawski, W.
    Berent, K.
    Wojewoda-Budka, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/355112.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al2O3-13TiO2 coating
    microstructura
    plasma spraying process
    powłoka Al2O3-13TiO2
    mikrostruktura
    proces natryskiwania plazmowego
    Opis:
    The aim of the study was to characterize nanostructured Al2O3-13TiO2 coatings deposited by plasma spraying on a grit blasted steel substrate. The Al2O3-13TiO2 coatings were characterized using scanning and transmission electron microscopy and X-ray diffraction techniques. Obtained coatings possessed a unique microstructure consisting of fully melted regions with the microstructure similar to a typical plasma sprayed lamellar morphology as the conventional coatings and areas comprising unmelted or partially melted nanosized particles. The analysis showed that most of the α-Al2O3 phase from the nanostructured powders transformed into γ-Al2O3 phase after plasma spraying process. Moreover, the presence of amorphous phase was also observed.
    W pracy przedstawiono charakterystykę nanostrukturalnych powłok Al2O3-13TiO2 natryskiwanych plazmowo na podłożu stalowym. Powłoki scharakteryzowano za pomocą skaningowej i transmisyjnej mikroskopii elektronowej oraz technik dyfrakcji rentgenowskiej. Mikrostruktura uzyskanych powłok składała się z obszarów powstałych z całkowicie stopionych proszków, podobnych do mikrostruktury powłok wytworzonych z proszków o rozmiarach konwencjonalnych, jak również z obszarów zawierających niestopione lub częściowo stopione nanocząstki. Wykazano, ze większość fazy α-Al2O3 występującej w materiale proszkowym uległa przemianie w faze γ-Al2O3 w trakcie procesu natryskiwania plazmowego. Zidentyfikowano również obecność fazy amorficznej.
    Źródło:
    Archives of Metallurgy and Materials; 2013, 58, 2; 335-339
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Powder Grain Size and Titania Content on Mechanical and Tribological Properties of Plasma Sprayed AL2O3-TiO2 Ceramic Coatings
    Autorzy:
    Góral, A.
    Żórawski, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/355219.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Al2O3-TiO2 coating
    nanostructures
    mechanical properties
    wear resistance
    Opis:
    In this work, three ceramic composite coatings Al2O3-3TiO2 C, Al2O3-13TiO2 C, and Al2O3-13TiO2 N were plasma sprayed on steel substrates. They were deposited with two conventional powders differing the volume fraction of TiO2 and nanostructured powder. The mechanical and tribological properties of the coatings were investigated and compared. The increase in TiO2 content from 3 wt.% to 13 wt.% in the conventional feedstock improved the mechanical properties and abrasion resistance of coatings. However, the size of the used powder grains had a much stronger influence on the properties of deposited coatings than the content of the titania phase. The Al2O3-13TiO2 coating obtained from nanostructured powder revealed significantly better properties than that plasma sprayed using conventional powder, i.e. 22% higher microhardness, 19% lower friction coefficient, and over twice as good abrasive wear resistance. In turn, the Al2O3-13TiO2 conventional coating showed an increase in microhardness and abrasive wear resistance, 36% and 43%, respectively, and 6% higher coefficient of friction compared to the Al2O3-3TiO2 conventional coating.
    Źródło:
    Archives of Metallurgy and Materials; 2019, 64, 1; 45-53
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of TiO₂ on the microstructure and phase composition of Al₂O₃ and Al₂O₃–TiO₂ APS sprayed coatings
    Autorzy:
    Michalak, Monika
    Łatka, Leszek
    Sokołowski, Paweł
    Candidato, Rolando T.
    Ambroziak, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2128148.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coating
    atmospheric plasma spraying
    Al2O3
    TiO2
    powłoka
    natryskiwanie plazmowe atmosferyczne
    Opis:
    Plasma sprayed ceramic coatings serve as protective layers and are frequently exposed to aggressive wear, corrosion, or high-temperature environment. Currently, alumina and alumina-titania are some of the most popular protective ceramic composite coatings used in the industry. The present work deals with the investigation of the influence of TiO₂ content in the feedstock powder on the resulting microstructure and properties of Al₂O₃, Al₂O₃ + 3 wt% TiO₂, Al₂O₃ + 13 wt% TiO₂ and Al₂O₃ + 40 wt% TiO₂ coatings developed via atmospheric plasma spraying (APS). Specifically, the phase composition, morphology, and microstructure, as well as the mechanical and tribological performance of the coatings were examined. Results revealed that higher content of TiO₂ induced the transformation of phases, leading to the formation of intermediary Al₂TiO₅ and Al₂- xTi₁- xO₅ phases. Also, the dominant α–Al₂O₃ to γ–Al₂O₃ transformation confirmed the formulation of well-melted lamellas within the coating structure. It was also shown that the increase in TiO₂ content decreased the micro-hardness of the coatings due to the formation of the intermediary phases as mentioned above and thus, affected their tribological performance. The lowest volumetric wear, equal to 7.2×10⁻⁵ mm³/(N ∙ m), was reported for Al₂O₃ + 13 wt% TiO₂ coating.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; e136735, 1--9
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of TiO₂ on the microstructure and phase composition of Al₂O₃ and Al₂O₃–TiO₂ APS sprayed coatings
    Autorzy:
    Michalak, Monika
    Łatka, Leszek
    Sokołowski, Paweł
    Candidato, Rolando T.
    Ambroziak, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2173602.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    coating
    atmospheric plasma spraying
    Al2O3
    TiO2
    powłoka
    natryskiwanie plazmowe atmosferyczne
    Opis:
    Plasma sprayed ceramic coatings serve as protective layers and are frequently exposed to aggressive wear, corrosion, or high-temperature environment. Currently, alumina and alumina-titania are some of the most popular protective ceramic composite coatings used in the industry. The present work deals with the investigation of the influence of TiO₂ content in the feedstock powder on the resulting microstructure and properties of Al₂O₃, Al₂O₃ + 3 wt% TiO₂, Al₂O₃ + 13 wt% TiO₂ and Al₂O₃ + 40 wt% TiO₂ coatings developed via atmospheric plasma spraying (APS). Specifically, the phase composition, morphology, and microstructure, as well as the mechanical and tribological performance of the coatings were examined. Results revealed that higher content of TiO₂ induced the transformation of phases, leading to the formation of intermediary Al₂TiO₅ and Al₂- xTi₁- xO₅ phases. Also, the dominant α–Al₂O₃ to γ–Al₂O₃ transformation confirmed the formulation of well-melted lamellas within the coating structure. It was also shown that the increase in TiO₂ content decreased the micro-hardness of the coatings due to the formation of the intermediary phases as mentioned above and thus, affected their tribological performance. The lowest volumetric wear, equal to 7.2×10⁻⁵ mm³/(N ∙ m), was reported for Al₂O₃ + 13 wt% TiO₂ coating.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 2; art. no. e136735
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effectiveness of hybrid Al2O3-TiO2 nano cutting fluids application in CNC turning process
    Autorzy:
    Arifuddin, A.
    Redhwan, A.A.M.
    Syafiq, A.M.
    Zainal Ariffin, S.
    Aminullah, A.R.M.
    Azmi, W.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200595.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    Al2O3-TiO2
    nano cutting fluid
    CNC turning
    response surface method
    RSM
    nano płyn do cięcia
    toczenie CNC
    metoda powierzchni odpowiedzi
    Opis:
    Purpose: The purpose of this study is to evaluate the effectiveness of hybrid Al2O3-TiO2 nano-cutting fluid in the turning process application under the selected significant machining parameters consisting of nano concentration, depth of cut and feed rate. Design/methodology/approach: The preparation of aqueous hybrid Al2O3-TiO2 water-based nano-cutting fluids and their application as the cutting fluid in turning operations are undertaken. The Al2O3-TiO2 hybrid nano-cutting fluids were prepared through a one-step method; by dispersing nanoparticles of Al2O3 (average diameter 30 nm) and TiO2 (average diameter 30-50 nm) in CNC coolant based at four different volume concentrations (1%, 2%, 3%, 4%). The effectiveness of turning cutting performance, namely cutting temperature (°C), average surface roughness (Ra), and tool wear (%), were assessed via air-assisted nano cutting fluids impinged through MQL setup in turning of Aluminium Alloy AA7075. The response surface method (RSM) was employed in the design of the experiment (DOE). Findings: The lowest cutting temperature, surface roughness, and tool wear of 25.8°C, 0.494 μm, and 0.0107%, are obtained, respectively, when the combinations of hybrid nano cutting fluid concentration of 4%, feed rate value of 0.1 mm/rev, and 0.3 mm depth of cut is used. Research limitations/implications: The result in this paper is based on the experimental study of Al2O3-TiO2 hybrid nano-cutting fluid using CNC turning operation. The process focuses on the finishing process by using a finishing insert. Further work using roughing process may be suggested to observe the better performance of this cutting process using nano-cutting fluid towards reducing the wear rate. Practical implications: The use of Al2O3-TiO2 hybrid nano-cutting fluid coupled with MQL in the CNC turning process is considered a new method. Machining soft and delicate materials such as Aluminium should consider using this combination technique since it lowers the cutting temperature and removes the chips, reducing the adhesive wear. Originality/value: The hybrid nano-cutting fluid can replace the conventional cutting fluid and will perform better if combined with the MQL cooling technique; this new method should be considered by major industry players that require a high-precision finished product such as the product that involves aircraft and aerospace applications.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 117, 2; 70--78
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stability analysis of hybrid Al2O3-TiO2 nano-cutting fluids
    Autorzy:
    Arifuddin, A.
    Redhwan, A.A.M.
    Syafiq, A.M.
    Zainal Ariffin, S.
    Aminullah, A.R.M.
    Azmi, W.H.
    Powiązania:
    https://bibliotekanauki.pl/articles/24200583.pdf
    Data publikacji:
    2022
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    Al2O3-TiO2
    nano cutting fluid
    stability analysis
    nano płyn do cięcia
    analiza stabilności
    Opis:
    Purpose: This paper is to study the stability of the current combination of hybrid nano-cutting fluids due to the recent progress in the analysis of nano-cutting fluids, such as the assessment methods for the stability of nano-cutting fluids, have revealed that instability is a common problem associated with nano cutting fluids. Design/methodology/approach: Five samples of 0.001 vol% that are suitable to be tested at UV-Vis machine, Al2O3–TiO2 hybrid nano-cutting fluid was prepared using a one-step process with the help of a magnetic stirrer to stir for 30 minutes with different sonication time to determine the best or optimum sonication time for this hybrid nano-cutting fluid. Stability of nano-cutting fluids was analyses using UV–Vis spectrophotometer (0.001%, 0.0001%, 0.00001%), visual sedimentation (1%, 2%, 3%, 4%), TEM photograph capturing techniques (2%) and zeta potential analysis (0.001%, 0.00001%), that used different volume concentration that is suitable for each type of stability analysis. Findings: The stability analysis reveals that the best sonication time is 90 minutes, and the UV-vis spectrophotometer shows the stability of all samples is above 80% during a month compared to the initial value. Further, visual sedimentation shows good stability with minimum sedimentation and colour separation only. The zeta potential value also shows great stability with a value of 37.6 mV. It is found that the hybrid nano-cutting fluid is stable for more than a month when the nano is suspended in the base fluid of conventional coolant. Research limitations/implications: The result in this paper is based on the experimental study of Al2O3-TiO2/CNC coolant base hybrid nano-cutting fluid for a month. However, to further validate the results presented in this paper, it is recommended to prolong the stability assessment time for six months for longer shelf life. Practical implications: The finding of this experimental study can be useful for high-precision product machining using similar CNC coolants, especially for aircraft and airspace applications for machining parts. Originality/value: No thorough stability assessment using all four types of stability analysis is done on Al2O3-TiO2/CNC Coolant base hybrid nano cutting fluid.
    Źródło:
    Archives of Materials Science and Engineering; 2022, 117, 1; 5--12
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of magnesium aluminate spinel doped TiO2 from magnesite waste
    Autorzy:
    Canikoğlu, Nuray
    Powiązania:
    https://bibliotekanauki.pl/articles/2048865.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    magnesium aluminate spinel
    MgAl2O4
    titanium dioxide
    TiO2
    magnesite waste
    alumina
    Al2O3
    Opis:
    Magnesium aluminate spinel (MgAl2O4) is an important refractory material of magnesia origin. It is formed by the reaction of magnesium and aluminum oxides. In this study, TiO2 was added to magnesite waste and alumina (Al2O3) powders in different proportions and the mixtures were sintered at different temperatures after shaping. The aim of this study was to produce spinel economically by recycling waste materials. Therefore, titanium dioxide (TiO2) added magnesium aluminate spinel was produced and the products obtained were characterized by XRD and SEM-EDS analyses. In addition, bulk density, apparent porosity and microhardness values were measured and the effects of TiO2 additive on magnesium aluminate properties were examined. The better values were determined in samples doped 4 wt.% TiO2 at the sintering temperature of 1400°C.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 311-316
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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