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    Wyświetlanie 1-7 z 7
    Tytuł:
    Influence of the Hardener Type on the Hardening Process Kinetics of the Selected Self-setting Sands
    Autorzy:
    Jamrozowicz, Ł.
    Kolczyk, J.
    Kaźnica, N.
    Pyziak, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/381668.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    loose self-setting sands
    hardening kinetics
    ultrasound investigations
    Opis:
    Measurements of the hardening process of the selected self-setting sands are presented in the hereby paper. Moulding sands were prepared on the matrix of „Szczakowa” sand of the Sibelco Company. Two resins: phenol-formaldehyde-furfuryl (FF/AF) and urea-formaldehyde-furfuryl (MF/AF) were used for making moulding sands. – Methylbenzene-sulphonic acid was applied as a hardener for the moulding sand on FF/AF resin, while paratoluene-sulphonic acid for the moulding sand on MF/AF resin. Both hardeners were used in two concentrations: low – the so-called ‘slow’ hardener and high - ‘fast’ hardener. During investigations the courses of the hardening process were determined, more accurately changes of the velocity of the ultrasound wave passage through the moulding sand cL = f(t) and changes of the moulding sand hardening degree versus time, Sx = f(t). In addition the kinetics of the hardening process was determined. Measurements were performed on the research stand for ultrasound investigations.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 73-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New look at the process of reclamation of moulding sands
    Autorzy:
    Dobosz, S. M.
    Major-Gabryś, K.
    Hosadyna, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380262.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    masa formierska
    innovative foundry materials
    innovative foundry technologies
    moulding sand
    reclaim
    ester hardener
    Opis:
    This paper presents a new perspective on the issue of reclamation of moulding and core sands. Taking as a premise that the reclamation process must remain on the surface of grains some not separated binding materials rests, it should be chosen the proper moulding sand's composition that will be least harmful for the reclaim quality. There are two different moulding and core sands taken into examinations. The researches prove that a small correction of their compositions (hardener type) improves the quality of the received reclaims. Carried out in this article studies have shown that such an approach to the problem of reclamation of the moulding and core sands is needed and reasonable.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 19-24
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the hardener type on the sulfur diffusion from moulding sand to the casting surface
    Autorzy:
    Hosadyna, M.
    Dobosz, S. M.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/381690.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    sulphur diffusion
    nodular cast iron
    masa formierska
    dyfuzja siarki
    żeliwo sferoidalne
    Opis:
    The article is discussing authors examinations concerning the influence of the sulphur diffusion from moulding sand on reduction the efficiency of modifier elements in the process of making the nodular cast iron. In case of magnesium decrease of its content is observe, as a result of forming the magnesium sulphide. In consequence the participation of magnesium is falling below the concentration essential to create a spheroid graphite. The source of sulphur in no-bake sand with resin modified by furfuryl alcohol is a hardener, on the basis of sulphonic acids and sulphuric acid. Described examinations relate to no-bake sands made on the warp of fresh quartz sand.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 2 spec.; 87-92
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of Glassex additive on properties of microwave-hardened and self-hardened moulding sands with water glass
    Autorzy:
    Major-Gabryś, K.
    Dobosz, S. M.
    Jakubski, J.
    Stachowicz, M.
    Nowak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/382492.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    masa formierska
    szkło wodne
    mikrofale
    moulding sand
    water glass
    ester hardener
    microwave hardening
    Opis:
    The article takes into consideration the researches concerning inserting the Glassex additive to the microwaved-hardened and self-hardened moulding sands with water glass. In the research different types of ester hardeners to self-hardened moulding sands with water glass were used. The influence of Glassex additive on retained strength of moulding sands with different hardeners and prepared by different technologies of hardening were tested. The influence of different hardeners and the technology of hardening on retained strength of moulding sand with water glass and the Glassex additive were also estimated.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 130-134
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Organic Moulding Sands for Production of Large-Size Castings
    Autorzy:
    Major-Gabryś, K.
    Hosadyna-Kondracka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382360.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative materials
    moulding sand
    organic binder
    furfuryl resin
    hardener
    alkyd resin
    alphaset process
    innowacyjne technologie odlewnicze
    materiały innowacyjne
    piasek formierski
    spoiwo organiczne
    żywica furfurylowa
    utwardzacz
    żywica alkidowa
    Opis:
    Recently, some major changes have occurred in the structure of the European foundry industry, such as a rapid development in the production of castings from compacted graphite iron and light alloys at the expense of limiting the production of steel castings. This created a significant gap in the production of heavy steel castings (exceeding the weight of 30 Mg) for the metallurgical, cement and energy industries. The problem is proper moulding technology for such heavy castings, whose solidification and cooling time may take even several days, exposing the moulding material to a long-term thermal and mechanical load. Owing to their technological properties, sands with organic binders (synthetic resins) are the compositions used most often in industrial practice. Their main advantages include high strength, good collapsibility and knocking out properties, as well as easy mechanical reclamation. The main disadvantage of these sands is their harmful effect on the environment, manifesting itself at various stages of the casting process, especially during mould pouring. This is why new solutions are sought for sands based on organic binders to ensure their high technological properties but at the same time less harmfulness for the environment. This paper discusses the possibility of reducing the harmful effect of sands with furfuryl binders owing to the use of resins with reduced content of free furfuryl alcohol and hardeners with reduced sulphur content. The use of alkyd binder as an alternative to furfuryl binder has also been proposed and possible application of phenol-formaldehyde resins was considered.
    Źródło:
    Archives of Foundry Engineering; 2019, 3; 99-105
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Hardener on the Emission of Harmful Substances from Moulding Sands with Furan Resin in the Pyrolysis Process
    Autorzy:
    Holtzer, M.
    Kmita, A.
    Żymankowska-Kumon, S.
    Bobrowski, A.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/380824.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    furan resin
    mould sand
    emission of gases
    pyrolisis
    BTEX
    PAH
    żywica furanowa
    masa formierska
    emisja gazów
    piroliza
    Opis:
    The furan resin offers advantages such as high intensity, low viscosity, good humidity resistance and is suitable for cast different casting alloys: steel, cast iron and non-ferrous metal casting. For hardening furan resins are used different hardeners (acid catalysts). The acid catalysts have significant effects on the properties of the cured binder (e,g. binding strength and thermal stability) [1 - 3]. Investigations of the gases emission in the test foundry plant were performed according to the original method developed in the Faculty of Foundry Engineering, AGH UST. The analysis is carried out by the gas chromatography method with the application of the flame-ionising detector (FID) (TRACE GC Ultra THERMO SCIENTIFIC).
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 1; 107-111
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Harmfulness Assessment of Moulding Sands with a Geopolymer Binder and a New Hardener, in An Aspect of the Emission of Substances from the Btex Group
    Ocena szkodliwości masy formierskiej ze spoiwem geopolimerowym i nowym utwardzaczem w aspekcie emisji związków z grupy BTEX
    Autorzy:
    Bobrowski, A.
    Holtzer, M.
    Żymankowska-Kumon, S.
    Dańko, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/353731.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sands
    binder
    geopolymers
    gasses emission
    BTEX
    piaski formierskie
    spoiwo
    geopolimery
    emisja gazów
    Opis:
    The harmfulness assessment of moulding sands with a geopolymer binder and a new hardener, in an aspect of the emission of substances from the BTEX group, was performed. Within the expedience project the new series of hardeners for the inorganic GEOPOL binder was developed. Before the introduction of the new system of moulding sands it was necessary to estimate their influence on the environment. To this aim the gasses emission from moulding sands subjected to the influence of liquid cast iron was tested with regard to the content of the gases from the BTEX group (benzene, toluene, ethylbenzene and xylenes). For the comparison the analogous investigations of the up to now applied moulding sands with the geopolymer binder, were performed. It was found that both systems of moulding sands binding emit similar amounts of gases, as well as similar amounts of substances from the BTEX group. Moulding sands with the GEOPOL binder are much more environmentally friendly than moulding sands with organic binders. The content of the BTEX group substances in gases emitted from moulding sands with the GEOPOL binder was approximately 10-times lower than in case of the moulding sands with organic binders.
    W ramach projektu celowego opracowano nową serię utwardzaczy dla spoiwa nieorganicznego Geopol. Przed wprowadzeniem nowego systemu mas formierskich konieczne było określenie ich wpływu na środowisko. W tym celu przeprowadzono badania emisji gazów z mas poddanych oddziaływaniu ciekłego żeliwa pod kątem zawartości w tych gazach związków z grupy BTEX (benzen, toluen, etylobenzen i ksyleny). Dla porównania przeprowadzono analogiczne badania dotychczas stosowanego systemu wiązania masy ze spoiwem geopolimerowym. Stwierdzono, ze obydwa systemy wiązania mas formierskich emitują zbliżone ilości gazów, jak również związków z grupy BTEX. W porównaniu do mas ze spoiwami organicznymi można uznać, że masy ze spoiwem GEOPOL są wysoce przyjazne dla środowiska. Zawartość związków z grupy BTEX w gazach emitowanych z mas ze spoiwem GEOPOL była około 10-krotnie mniejsza niż w przypadku mas ze spoiwami organicznymi.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 1; 341-344
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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