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    Wyświetlanie 1-3 z 3
    Tytuł:
    Improvement of Weldability of Hot-Dip Galvanized Steel by Anti-Galvanizing Coating with Si-Fe-Al Oxide-Based Micropowder
    Autorzy:
    So, Seong-Min
    Kim, Ki-Yeon
    Park, Il-Song
    Lee, Seok-Jae
    Yoo, Dong-Jin
    Kim, Yeon-Won
    Oh, Min-Suk
    Powiązania:
    https://bibliotekanauki.pl/articles/2203718.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hot-dip galvanizing
    anti-galvanizing
    oxide micropowder
    weldability
    Opis:
    A Si-Fe-Al ternary oxide-based micropowder coating was used to prevent the formation of a Zn coating on steel during the hot-dip Zn galvanizing process to reduce the welding fume and defects generated during the welding of Zn-galvanized steel. The composition ratio of the oxide powder was optimized and its microstructure and weldability were evaluated. The optimized oxide coating was stable in the hot-dip galvanizing bath at 470°C and effectively inhibited the formation of Zn coating. The Zn residue could be easily removed with simple mechanical impact. The proposed coating reduced Zn fume and prevented the residual Zn from melting in the weld bead during high-temperature welding, thus reducing the number of welding defects. The results indicated that this pretreatment can simplify the manufacturing process and shorten the process time cost-effectively.
    Źródło:
    Archives of Metallurgy and Materials; 2023, 68, 1; 155--159
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Combined Effect of CrB2 Micropowder and VN Nanopowder on the Strength and Wear Re-sistance of Fe‒Cu–Ni–Sn Matrix Diamond Composites
    Autorzy:
    Ratov, Boranbay
    Mechnik, Volodymyr
    Rucki, Miroslaw
    Gevorkyan, Edwin
    Kilikevicius, Arturas
    Kolodnitskyi, Vasyl
    Siemiatkowski, Zbigniew
    Umirova, Gulzada
    Chałko, Leszek
    Józwik, Jerzy
    Zhanggirkhanova, Arailym
    Chishkala, Vladimir
    Korostyshevskyi, Dmytro
    Powiązania:
    https://bibliotekanauki.pl/articles/2201897.pdf
    Data publikacji:
    2023
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    diamond composite
    electroconsolidation
    composite microstructure
    adhesion
    CrB2
    VN nanopowder
    micropowder
    VN
    wear resistance
    cutting tools
    mining tools
    Opis:
    The paper presents research results on the enhancement of diamond composites designed for tools application for mining industry, hard rocks cutting, able to withstand harsh conditions under heavy dynamical loads. In the present study, both CrB2 micropowder and VN nanopowder additives were used in proportions up to 5 wt.% and 6 wt.%, respectively, together with the basic matrix composition of 51 wt.% Fe, 32 wt.% Cu, 9 wt.% Ni, and 8 wt.% Sn. Addition of both components, CrB2 and VN, appeared to be ad-vantageous in proportion of 2 wt.% and 4 wt.%, respectively. This composition exhibited the highest relative density of 0.9968, better than that without additives. Similarly, the highest values of compressive strength Rcm and flexural strength Rbm were reached for the composite with the same percentage of CrB2 and VN. Compared to the composite with no addition of CrB2 and VN, Rcm improved by almost 70%, while Rbm by 81%. Additionally, the abovementioned additives enhanced the ability of the matrix to prevent the diamond reinforcement from being torn out of the composite, which is very important under harsh working conditions of the cutting tools. The presence of CrB2 micropowder and VN nanopowder promoted densification of the matrix and adhesion between the diamond grits and the Fe‒Cu–Ni–Sn matrix.
    Źródło:
    Advances in Science and Technology. Research Journal; 2023, 17, 1; 23--34
    2299-8624
    Pojawia się w:
    Advances in Science and Technology. Research Journal
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photochemical Conversion of CO₂ into Methyl Alcohol Using SiC Micropowder under UV Light
    Autorzy:
    Azzouz, F.
    Kaci, S.
    Bozetine, I.
    Keffous, A.
    Trari, M.
    Belhousse, S.
    Aissiou-Bouanik, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/1031493.pdf
    Data publikacji:
    2017-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    SiC micropowder
    CO₂ photoreduction
    methanol
    Opis:
    In our study, microparticles SiC powder was investigated as a catalyst for CO₂ photoreduction into methanol under UV light. The photochemical conversion of methanol was studied as function of time of exposition, the concentration and the grain size of the catalyst. The selectivity of the used catalyst to promote methanol formation was noticed. It was noticed also that the grain size and concentration have a great impact on the photochemical conversion of CO₂ to methanol. The best yield of methanol was achieved when a concentration of 0.75 M of SiC powder of 17 μm grain size and an exposure time to UV light of 2 h where assured. Maximum molar concentration of methanol achieved was under UV irradiation of 365 nm. Therefore, the catalytic property of silicon carbide has proved its efficiency in the photochemical conversion of CO₂ into alcohol thus far under UV light.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 3; 479-483
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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