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    Wyświetlanie 1-6 z 6
    Tytuł:
    Effect of friction stir processing (FSP) on microstructure and hardness of AlMg10/SiC composite
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200735.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir processing
    AlMg10/SiC composite
    microstructure
    kompozyt AlMg10/SiC
    mikrostruktura
    FSP
    Opis:
    The AlMg10 aluminum alloy reinforced with SiC particles was subjected to friction stir processing (FSP). The composite was made by mechanical mixing and gravity casting. The mass fraction of SiC particles in the composite was about 10%. Evaluation of the effects of FSP treatment was performed by means of light microscopy, scanning electron microscopy, EDS and hardness measurement. It was found that the inhomogeneous distribution of SiC particles and their agglomeration, which were observable in the cast composite, were completely eliminated after FSP modification. The treatment was also accompanied by homogenisation of the material in the mixing zone as well as fragmentation of both the matrix grain of the composite and SiC particles. In the case of SiC particles, a change in their shape was also observed. In the as-cast composite, particles with dimensions from 30 to 60 μm and a sharp-edged polyhedral shape prevailed, while in the material subjected to friction treatment, particles with dimensions from 20 to 40 μm and a more equiangular shape prevailed. Pores and other material discontinuities occurring frequently in the as-cast composite were completely eliminated after friction modification. The recorded changes in the microstructure of the material were accompanied by an increase in the hardness of the composite by nearly 35%. The conducted investigations have shown that FSP modification of the AlMg10/SiC composite made by the casting method leads to favorable microstructural changes in the surface layer and may be an alternative solution to other methods and technologies used in surface engineering.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 185-192
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of spray distance on the microstructure and corrosion resistance of WC - based coatings sprayed by HVOF
    Autorzy:
    Jonda, Ewa
    Łatka, Leszek
    Maciej, Artur
    Godzierz, Marcin
    Gołombek, Klaudiusz
    Radziszewski, Andrzej
    Powiązania:
    https://bibliotekanauki.pl/articles/2204526.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    WC-based powders
    AZ31 magnesium alloy
    high velocity oxy fuel
    HVOF
    microstructure
    corrosion resistance
    stop magnezu AZ31
    mikrostruktura
    odporność na korozję
    natryskiwanie naddźwiękowe cieplne
    proszek na bazie węglika wolframu
    Opis:
    Cermet coatings provide protection against aggressive operating environment of machine and device elements, such as corrosion, wear or high-temperature conditions. Currently WC-based cermet coatings are frequently used in the different industry branches. In this work, conventional WC-based powders (WC-Co and WC-Co-Cr) were sprayed with High Velocity Oxy Fuel (HVOF) onto AZ31 magnesium alloy with different spray distances (320 and 400 mm). The aim of the research was to investigate the effect of the spray distance on the microstructure of the coatings, phase composition and electrochemical corrosion resistance. Results revealed that higher spray distance results in greater porosity, 1.9% and 2.3% for 320 mm and 2.8% and 3.1% for 400 mm in case of WC-Co and WC-Co-Cr coatings, respectively. Also the influence has been observed for coatings microhardness, c.a. 1300 HV0.3 for shorter spray distance, whereas for longer one it was less than 1100 HV0.3. The corrosion resistance estimated in potentiodynamic polarization measurements was the best for WC-Co-Cr coating deposited from the shorter spray distance, corrosion current density was equal to 2.9 µA·cm-2 and polarization resistance was equal to 8424 Ω∙cm2.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2023, 71, 2; art. no. e144610
    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/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:
    Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding
    Autorzy:
    Kumar, Rajiv
    Vettivel, S. C.
    Kumar Kansal, Harmesh
    Powiązania:
    https://bibliotekanauki.pl/articles/2090702.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    depth of penetration
    tensile strength texture
    stop aluminium
    głębokość penetracji
    wytrzymałość na rozciąganie
    Opis:
    Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; e136215, 1--8
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of SiO2 flux on the depth of penetration, microstructure, texture and mechanical behavior of AA6063 T6 aluminum alloy using activated TIG welding
    Autorzy:
    Kumar, Rajiv
    Vettivel, S. C.
    Kumar Kansal, Harmesh
    Powiązania:
    https://bibliotekanauki.pl/articles/2173585.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminum alloy
    depth of penetration
    tensile strength texture
    stop aluminium
    głębokość penetracji
    wytrzymałość na rozciąganie
    Opis:
    Activated tungsten inert gas (ATIG) welding has a good depth of penetration (DOP) as compared to the conventional tungsten inert gas (TIG) welding. This paper is mainly focused on ATIG characterization and mechanical behavior of aluminum alloy (AA) 6063-T6 using SiO2 flux. The characterization of the base material (BM), fusion zone (FZ), heat affected zone (HAZ) and, partially melted zone is carried out using the suitable characterization methods. The weld quality is characterized using ultrasonic-assisted non-destructive evaluation. A-scan result confirms that the ATIG welded samples have more DOP and less bead width as compared to conventional TIG. The recorded tensile strength of ATIG with SiO2 is better than the conventional TIG welding. The failure mode is ductile for ATIG welding with larger fracture edges and is brittle in the case of conventional TIG welding.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2021, 69, 1; art. no. e136215
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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