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Wyszukujesz frazę "wlasciwosci elektryczne" wg kryterium: Temat


Wyświetlanie 1-3 z 3
Tytuł:
Effect of Electrical Properties of Materials on Effectiveness of Heating Their Systems in Microwave Field
Autorzy:
Stachowicz, M.
Opyd, B
Granat, K.
Markuszewska, K.
Powiązania:
https://bibliotekanauki.pl/articles/381305.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative casting technologies
microwaves
moulding sands
foundry instrumentation
electrical properties
innowacyjne technologie odlewnicze
mikrofale
masa formierskia
właściwości elektryczne
Opis:
In the paper presented are results of a research on influence of electrical and physico-chemical properties of materials being parts of multicomponent and multimaterial systems used in foundry practice on efficiency and effectiveness of microwave heating. Effectiveness of the process was evaluated on the grounds of analysis of interaction between selected parameters of permittivity and loss factor, as well as collective index of energy absorbed, reflected and transmitted by these materials. In the examinations used was a stand of wave guide resonance cavity for determining electrical properties and a stand of microwave slot line for determining balance of microwave power emitted into selected materials. The examinations have brought closer the possibility of forecasting the behaviour of multimaterial systems like e.g. model, moulding sand or moulding box in microwave field on the grounds of various electrical and physico-chemical properties. On the grounds of analysis of the results, possible was selecting a group of materials designed for building foundry instrumentation to be effectively used in electromagnetic field.
Źródło:
Archives of Foundry Engineering; 2014, 14, 2; 111-114
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
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:
Effect of Water-Glass Content on Electrical Properties of Silica Sand-Based Moulding Sand
Autorzy:
Opyd, B.
Nowak, D.
Granat, K.
Powiązania:
https://bibliotekanauki.pl/articles/380420.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
innovative foundry technology
microwaves
moulding sand
water glass
electrical properties
innowacyjna technologia odlewnicza
mikrofale
masa formierska
szkło wodne
właściwości elektryczne
Opis:
In the paper, presented are measurements of permittivity εr and loss factor tgδ of moulding sand depending on bonding material content, taken at 2.45 GHz by perturbation method on a stand of wave-guide resonance cavity. The determined electrical properties are crucial for kinetics of microwave heating of sandmixes containing water-glass as a binder. The measurements were taken for two sandmixes with various sand grains. The results indicate that, for a moulding sands containing water-glass, the relationship between loss factor value and binder concentration is linear. All the examined moulding sands, irrespective of their base, show a relatively high susceptibility to action of microwave field of frequency 2.45 GHz. The presented measurements make a ground for developing a mathematical model of microwave heating of the systems moulding sand-foundry tooling.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3 spec.; 59-62
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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