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    Wyświetlanie 1-3 z 3
    Tytuł:
    Determination of Moisture Content in Synthetic Moulding Sand on the Grounds of Relative Permittivity Measurement
    Autorzy:
    Nowak, D.
    Gal, B.
    Granat, K.
    Jaworski, G.
    Więcławek, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/352740.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moisture content
    moulding sands
    relative permittivity
    microwaves
    Opis:
    The presented research was aimed at searching for an exact and effective method of determining moisture content in traditional moulding sands. By measuring resonance frequency and quality factor of a waveguide resonance cavity, relative permittivity was determined for different synthetic moulding sands. Analysis of the presented results confirms a linear relation between relative permittivity values and moisture content values in the selected traditional moulding sands. The obtained linear relationship can be used as a reference characteristic for evaluation of humidity of moulding sand.
    Źródło:
    Archives of Metallurgy and Materials; 2017, 62, 4; 2189-2192
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Electrical Properties of Multilayer Systems Composed of Foundry Tooling and Moulding Sand
    Autorzy:
    Gal, B.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381474.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technology
    microwaves
    electrical properties
    multilayer foundry system
    innowacyjna technologia odlewnicza
    mikrofale
    właściwości elektryczne
    system odlewniczy wielowarstwowy
    Opis:
    Within the research, selected multilayer technological systems created as combinations of water-glass containing moulding sand with foundry tooling, were characterised on the grounds of their electrical properties. By measuring resonance frequency and quality factor of a waveguide resonance cavity, real component of permittivity εr′ and loss tangent tgδ were determined for multilayer foundry systems with various qualitative and quantitative compositions. It was demonstrated that combination of a sandmix and foundry tooling with known dielectric properties results in a system with different physico-chemical properties, whose relation to the parameters of individual components of the system is undefined at this research stage. On the grounds of measurement results, theoretical value of microwave heating power, dissipated in unit volume of the selected multilayer foundry system, was determined. Knowledge of theoretical heating power and evaluation of physical, chemical and structural changes occurring in moulding sands exposed to microwaves in such a technological system makes a ground for empirical modelling of the process of microwave heating of foundry moulds and cores.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 2; 21-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of Microwave Drying Parameters on the Properties of Synthetic Moulding Sands
    Autorzy:
    Nowak, D.
    Gal, B.
    Włodarska, A.
    Granat, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381434.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    drying
    moulding sand
    strength properties
    permeability
    innowacyjne technologie odlewnicze
    suszenie mikrofalowe
    piasek formierski
    właściwości wytrzymałościowe
    przepuszczalność
    Opis:
    In this work, the influence of microwave drying parameters such as irradiation time and microwave power level on the properties of synthetic moulding sands is presented. Determination of compressive strength Rcs, shear strength Rts and permeability Ps of synthetic moulding sands with the addition of two different bentonites, after drying process with variable microwave parameters were made. The research works were carried out using the microwave oven with regulated power range of the electromagnetic field. From the results obtained, the significant influence of both drying time and microwave power level on the selected properties of moulding sands was observed. In comparison to the conventional drying method, microwave drying allows to obtain higher compressive strength of the synthetic moulding sand. The influence of application microwave irradiation on permeability was not observed. Higher strength characteristics and shorter drying time are major advantages of application of the electromagnetic irradiation for drying of the synthetic moulding sand with regard to conventional drying method.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 51-54
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-3 z 3

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