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    Wyświetlanie 1-4 z 4
    Tytuł:
    Effect of Methyl Silicone Oil to Moisture Resistance of Sodium Silicate Sands by Microwave Hardening
    Autorzy:
    Wang, Huafang
    Gao, Xiang
    Yang, Lei
    He, Wei
    Lu, Jijun
    Powiązania:
    https://bibliotekanauki.pl/articles/2126894.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sodium silicate sands
    microwave hardening
    methyl silicon oils
    moisture absorption
    piaski sodowo-krzemianowe
    hartowanie mikrofalowe
    olej metylosilikonowy
    wchłanianie wilgoci
    Opis:
    The sodium silicate sands hardened by microwave have the advantages of high strength, fast hardening speed and low residual strength with the lower addition of sodium silicate. However, the sodium ion in the sands will absorb moisture from the atmosphere, which would lead to lower storing strength, so the protection of a bonding bridge of sodium silicate between the sands is crucial. Methyl silicone oil is a cheap hydrophobic industrial raw material. The influence of the addition amount of methyl silicone oil modifier on compressive strength and moisture absorption of sodium silicate sands was studied in this work. The microscopic analysis of modified before and after sodium silicate sands has been carried on employing scanning electron microscopy(SEM) and energy spectrum analysis(EDS). The results showed that the strength of modified sodium silicate sands was significantly higher than that of unmodified sodium silicate sands, and the best addition of methyl silicone oil in the quantity of sodium silicate was 15%. It was also found that the bonding bridge of modified sodium silicate sands was the density and the adhesive film was smooth, and the methyl silicone oil was completely covered on the surface of the sodium silicate bonding bridge to protect it.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 1; 43--47
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Phosphate Binder for Ablation Casting of AlSi7Mg Modified TiB Alloy
    Autorzy:
    Puzio, Sabina
    Kamińska, J.
    Major-Gabryś, K.
    Angrecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126893.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ablation casting technology
    alumina
    phosphate binder
    self-hardening sand
    inorganic binder
    odlewanie ablacyjne
    tlenek glinu
    spoiwo fosforanowe
    piaski samoutwardzalne
    spoiwo nieorganiczne
    Opis:
    The possibilities of using an inorganic phosphate binder for the ablation casting technology are discussed in this paper. This kind of binder was selected for the process due to its inorganic character and water-solubility. Test castings were made in the sand mixture containing this binder. Each time during the pouring liquid alloy into the molds and solidification process of castings, the temperature in the mold was examined. Then the properties of the obtained castings were compared to the properties of the castings solidifying at ambient temperature in similar sand and metal molds. Post-process materials were also examined - quartz matrix and water. It has been demonstrated that ablation casting technology promotes refining of the microstructure, and thus upgrades the mechanical properties of castings (Rm was raised about approx. 20%). Properties of these castings are comparable to the castings poured in metal moulds. However, the post-process water does not meet the requirements of ecology, which significantly reduces the possibility of its cheap disposal.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 1; 62--68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Examination of Gas Flows in Cores About the Changeable Cross-sections Executed in the Cold-box Technology
    Autorzy:
    Jamrozowicz, Ł.
    Zych, J.
    Kolczyk, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/383372.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cold-box process
    gas flows
    pressure measurement
    carbon dioxide
    moulding sands
    cold box
    przepływ gazu
    pomiar ciśnienia
    dwutlenek węgla
    piaski formierskie
    hartowanie
    Opis:
    The measurement results of the gas pressure in intergranular spaces of fast-setting moulding sands, hardened by a reactive gaseous factor, are presented in the hereby paper. In addition, the new research stand for measuring gas pressure changes in the core of a variable cross-section, during hardening of this core, is shown. The measuring method is also described. Investigations concern determinations and recording of the gas pressure pathways in moulding sands along the core height, in five measuring points. The influence of the hardening gas pressure on the gas distribution in the moulding sand was determined. The influence of the shape change (cross-section) of the core on the character of changes of the hardening gas pressure in the core being hardened, was also shown. The hardening gas of a constant pressure was fed continuously into the core.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 1 spec.; 41-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Floster S Technology in Modified Ablation Casting of Aluminum Alloys
    Autorzy:
    Kamińska, J.
    Angrecki, M.
    Puzio, S.
    Hosadyna-Kondracka, M.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379813.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sands
    ablation casting
    water glass
    floster S
    mechanical properties of casting
    surface quality
    piaski formierskie
    odlewanie ablacyjne
    szklanka wody
    właściwości mechaniczne odlewu
    jakość powierzchni
    Opis:
    Ablation casting is a technological process in which the increased cooling rate causes microstructure refinement, resulting in improved mechanical properties of the final product. This technology is particularly suitable for the manufacture of castings with intricate shapes and thin walls. Currently, the ablation casting process is not used in the Polish industry. This article presents the results of strength tests carried out on moulding sands based on hydrated sodium silicate hardened in the Floster S technology, intended for ablation casting of the AlSi7Mg (AK7) aluminium alloy. When testing the bending and tensile strengths of sands, parameters such as binder and hardener content were taken into account. The sand mixtures were tested after 24h hardening at room temperature. The next stage of the study describes the course of the ablation casting process, starting with the manufacture of foundry mould from the selected moulding mixture and ending in tests carried out on the ready casting to check the surface quality, structure and mechanical properties. The results were compared with the parallel results obtained on a casting gravity poured into the sand mould and solidifying in a traditional way at ambient temperature.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 81-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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