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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effects of Pressure on the Rate of Tin Evaporation From Liquid Iron
    Wpływ ciśnienia na szybkość parowania cyny z ciekłego żelaza
    Autorzy:
    Lipart, J.
    Łabaj, J.
    Słowikowski, M.
    Jama, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352625.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    liquid iron
    evaporation
    vacuum induction furnace
    mass transfer coefficient
    ciekłe żelazo
    parowanie
    próżniowy piec indukcyjny
    współczynnik przenikania masy
    Opis:
    In the paper, tin elimination from liquid iron alloy via low-pressure evaporation has been analysed. The experiments were performed using a single-chamber VIM 20-50 vacuum induction furnace at 1923 K and the operating pressure of 0.05 to 557 Pa.
    W prezentowanej pracy dokonano analizy procesu eliminacji cyny z ciekłego stopu żelaza na drodze odparowania w warunkach obniżonego ciśnienia. Eksperymenty realizowano w jednokomorowym indukcyjnym piecu próżniowym V1M 20-50 w temperaturze 1923 K i zakresie ciśnień roboczych od 0.05 do 557 Pa.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 2; 825-828
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Contribution to Deoxidation of Austenitic Steels in a Vacuum Induction Furnace with Carbon
    Autorzy:
    Šenberger, J.
    Pernica, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/379906.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    vacuum induction furnace
    deoxidation
    carbon
    austenitic steel
    petrochemistry
    oxygen activity
    total oxygen
    próżniowy piec indukcyjny
    odtlenianie
    węgiel
    staliwo austenityczne
    petrochemia
    aktywność tlenu
    Opis:
    Deoxidation of steel with carbon under reduced pressure is often used for increasing the steel purity. Suitable units for this purpose in foundries are vacuum induction furnaces. Possibilities of increasing the steel purity by deoxidation with carbon in the vacuum induction furnace were studied for the steel for the petrochemistry of specific composition 25Cr/35Ni. The charge composed of the return material only was melted in the air. During melting the charge oxidized and the oxidizing slag formed. Chemical composition of steel, morphology, chemical composition of inclusions in the steel and chemical composition of slag after vacuuming were studied on the basis of samples taken before and after vacuuming. Temperature and oxygen activity were measured before and after vacuuming. Globular inclusions with dominant content of silicon and manganese were observed in steel before and after vacuuming. Contents of total oxygen in steel didn’t change significantly during vacuuming. On the basis of composition of inclusions and measured oxygen activity the activity of Cr2O3 in inclusions was calculated. A slag sample was taken after vacuuming and equilibrium oxygen activity in steel with regard to the Cr2O3 content in the slag was estimated from the slag composition. Equilibrium oxygen activity in relation to the Cr2O3 content in the slag was higher than equilibrium activity measured in the steel. For this reason it is not possible, under the studied conditions, to decrease oxygen content in steel during vacuuming.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 105-109
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Elimination of Zinc from Aluminum During Remelting in an Vacuum Induction Furnace
    Autorzy:
    Smalcerz, Albert
    Blacha, Leszek
    Węcki, Bartosz
    Desisa, D. G.
    Łabaj, Jerzy
    Jodkowski, Maciej
    Powiązania:
    https://bibliotekanauki.pl/articles/2174631.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    mass transfer coefficient
    zinc evaporation
    vacuum induction furnace
    meniscus
    współczynnik przenikania masy
    odparowanie cynku
    piec indukcyjny próżniowy
    menisk
    Opis:
    In this paper, the results of the study on aluminium evaporation from the Al-Zn alloys (4.2% weight) during remelting in a vacuum induction furnace (VIM) are presented. The evaporation of components of liquid metal alloys is complex due to its heterogeneous nature. Apart from chemical affinity, its speed is determined by the phenomena of mass transport, both in the liquid and gas phase. The experiments were performed at 10-1000 Pa for 953 K - 1103 K. A significant degree of zinc loss has been demonstrated during the analysed process. The relative values of zinc loss ranged from 4 to 92%. Lowering the pressure in the melting system from 1000 Pa to 10 Pa caused an increase in the value of density of the zinc evaporating stream from 3.8210-5 to 0.000564 gcm-2s-1 at 953 K and 3.3210-5 to 0.000421 gcm-2s-1 for 1103 K. Based on the results of the conducted experiments. it was found that evaporation of zinc was largely controlled by mass transfer in the gas phase and only for pressure 10 Pa this process was controlled by combination of both liquid and gas phase mass transfer.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 3; 11--18
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Aluminium loss during Ti-Al-X alloy smelting using the VIM Technology
    Autorzy:
    Smalcerz, Albert
    Blacha, L.
    Łabaj, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837812.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    melting of Ti-Al alloys
    induction vacuum furnace
    evaporation of metals
    stopy Ti-Al
    indukcyjny piec próżniowy
    odparowanie
    Opis:
    Titanium alloys belonging to the group of modern metallic materials used in many industries, including the aerospace industries. Induction crucible vacuum furnaces and induction furnaces with cold crucible are most commonly used for their smelting. When operating these devices, one can deal with an adverse phenomenon of decrease in the content of alloy elements that are characterized by higher equilibrium vapour pressure than the matrix metal or titanium, in the metal bath. In the paper, results of the study on aluminium evaporation from the Ti-Al-Nb, Ti-Al-V and Ti-Al alloys (max 6.2 % wt.) during smelting in a vacuum induction melting (VIM) furnace are presented. The experiments were performed at 10 to 1000 Pa for 1973 K and 2023 K. A significant degree of aluminium loss has been demonstrated during the analysed process. The values of relative aluminium loss for all the alloys ranged from 4 % to 25 %. Lowering the pressure in the melting system from 1000 Pa to 10 Pa resulted in increased values of aluminium evaporation flux from 4.82⋅10-5 to 0.000327 g⋅cm-2⋅s-1 for 1973 K and from 9.28⋅10-5 to 0.000344 g⋅cm-2⋅s-1 for 2023 K. The analysis of the results obtained took into account the value of the actual surface of the liquid metal. In the case of melting metals in an induction furnace, this surface depends on the value of power emitted in the charge. At greater power, we observe a significant increase in the bath surface due to the formation of a meniscus.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 11-17
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Removal of Lead From Blister Copper by Melting in the Induction Vacuum Furnace
    Autorzy:
    Smalcerz, A.
    Blacha, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/946871.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    removal of lead
    vapour pressure
    blister copper
    induction vacuum furnace
    evaporation of metals
    refining of cooper
    usuwanie ołowiu
    miedź konwertorowa
    indukcyjny piec próżniowy
    topienie
    rafinacja
    Opis:
    The usage of the reduced pressure in the processes of smelting and refining of metal alloys allow to remove not only the gases dissolved in the metal bath, but also the impurities having a higher vapour pressure than the matrix metal. Blister copper produced in flash furnace contains many impurities such as lead, bismuth and arsenic. Some of them must be removed from molten metals, because of their deleterious effects on copper electrical properties. When the smelting process is carried out in the induction vacuum furnaces, the above-mentioned phenomenon is being intensified, one or another mixing of bath and increase in the surface area of mass exchange (liquid metal surface). The latter results from the formation of a meniscus being an effect of the electromagnetic field influence on the liquid metal. In the work, the results of refining blister copper in terms of removing lead from it, are presented. The experiments were carried out in the induction crucible vacuum furnace at temperatures of 1473 and 1523 K, and operating pressures in a range of 8 - 533 Pa.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 2; 84-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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