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    Wyświetlanie 1-2 z 2
    Tytuł:
    The Assessment of the Permeability of Selected Protective Coatings Used for Sand Moulds and Cores
    Autorzy:
    Jamrozowicz, Ł.
    Siatko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381009.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    permeability
    protective coatings
    coating viscosity
    core
    mold
    przepuszczalność
    powłoki ochronne
    lepkość powłoki
    rdzeń
    forma
    Opis:
    The article presents the results of permeability measurements of a zirconium alcohol coating applied on moulds and cores. The introduction extensively discusses the reasons for the application of protective coatings, as well as their advantages and disadvantages. Also, the problems related to the application of protective coatings are presented i.e. limited permeability and thus the possibility of the presence of gas-originated defects in the casts. Next, the paper discusses the methods of measuring the permeability of protective coating proposed by Falęcki and Pacyniak. The study also presents an indirect permeability measurement method. For the investigations, zirconium alcohol coatings with the three conventional viscosities 10, 20 and 30s were used. The viscosity was determined by means of the Ford cup with the clearance of 4mm. The coatings were applied onto profiles of Φ 50x50 mm, made of moulding sand consisting of a sand matrix with the mean grain size of dL = 0,11, 17, 24, 31 and 34 mm and phenol-formaldehyde resin. The effect of the matrix grain size on the permeability of the sand with and without a coating was determined.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 17-22
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigations of the Thickness of Protective Coatings Deposited on Moulds and Cores
    Autorzy:
    Jamrozowicz, Ł.
    Kolczyk-Tylka, J.
    Siatko, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/380191.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    protective coating
    coating thickness
    coating viscosity
    foundry core
    foundry mold
    powłoka ochronna
    grubość powłoki
    lepkość powłoki
    rdzeń odlewniczy
    masa odlewnicza
    Opis:
    This article presents measurements of the thickness of alcohol-based coatings on sand foundry cores and moulds. These coatings were applied using two methods, the dipping method and the painting method. For the purposes of the study, a zircon alcohol-based coating was prepared with three different levels of nominal viscosity; very thin at 10s, average at 20s, and thick at 30s. The coating was applied to a core made of quartz sand and furan resin. The cores were made of sand with three different grain sizes; dL = 0.22 mm – fine sand, dL = 0.33 mm medium sand, and dL = 0.47 mm coarse sand. In the study, the thickness of the coating obtained to the core was measured immediately after application as well as after drying. Additionally, the extent of penetration into the intergranular spaces of the core matrix was measured. On the basis of this study, the impact of the grain size of the core matrix on the thickness of the coating and its penetration into the core was assessed. The thickness of coatings obtained using different application methods was also assessed.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 4; 131-136
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-2 z 2

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