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    Wyświetlanie 1-8 z 8
    Tytuł:
    Destruction of Moulding Sands with Chemical Binders Caused by the Thermal Radiation of Liquid Metal
    Autorzy:
    Zych, J.
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/382547.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    sand mould
    thermal destruction
    thermal radiation
    heating of mould
    loss of strength
    masa formierska
    rozkład termiczny
    promieniowanie cieplne
    Opis:
    The obtained results of heating of sand moulds with binders by means of a thermal radiation of liquid metal are presented in this study. Standard samples for measuring Rg made of the tested moulding sands were suspended at the lower part of the cover which was covering the crucible with liquid metal (cast iron), placed in the induction furnace. The authors own methodology was applied in investigations. The progressing of the samples surface layers heating process was determined as the heating time function. Samples of a few kinds of moulding sands with chemical binders were tested. Samples without protective coatings as well as samples with such coatings were tested. The influence of the thermal radiation on bending resistance of samples after their cooling was estimated. The influence of several parameters such as: time of heating, distance from the metal surface, metal temperature, application of coatings, were tested. A very fast loss of strength of moulding sands with organic binders was found, especially in cases when the distance between metal and sample surfaces was small and equaled to 10÷15 mm. Then, already after app. 15 seconds of the radiation (at Tmet=1400°C), the resistance decreases by nearly 70%. Generally, moulding sands with organic binders are losing their strength very fast, while moulding sands with water glass at first increase their strength and later slightly lose. The deposition of protective coatings increases the strength of the mould surface layers, however does not allow to retain this strength after the metal thermal radiation.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 4; 95-100
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of Gas Emission from Heated Moulding Sands Together with the On-line Assessment of H2 and O2 Fractions - New Investigation Method
    Autorzy:
    Mocek, J.
    Zych, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/379867.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    gas emission
    evolution rate
    hydrogen content
    oxygen content
    moulding sand
    resin
    burning
    moulding sand destruction
    emisja gazu
    tempo rozwoju
    zawartość wodoru
    zawartość tlenu
    masa formierska
    żywica
    spalanie
    Opis:
    The new investigation method of the kinetics of the gas emission from moulding sands used for moulds and cores is presented in this paper. The gas evolution rate is presented not only as a function of heating time but also as a function of instantaneous temperatures. In relation to the time and heating temperature the oxygen and hydrogen contents in evolving gases was also measured. This method was developed in the Laboratory of Foundry Moulds Technology, Faculty of Foundry Engineering, AGH. Gas amounts which are emitted from the moulding sand at the given temperature recalculated to the time unit (kinetics) are obtained in investigations. Results of investigations of moulding sand with furan resin are presented - as an example - in the paper.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 4; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas Generation Properties of Materials Used in the Sand Mould Technology – Modified Research Method
    Autorzy:
    Zych, J.
    Mocek, J.
    Snopkiewicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/380142.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding mass
    materials used
    research methodology
    generation kinetics
    masa formierska
    materiały
    metodologia badań
    kinetyka
    Opis:
    The paper presents a new methodology for research on gas generation property of materials used for sand forms and cores, models made of foamed polystyrene, protective layers, etc. In the form of an example, full analysis has been presented of gas generation property of a selected furan resin bonded sand, stating the course and kinetics of gas generation, their intensity in the time function, and in the heating temperature function. The description is of quantitative nature. The existence of peaks in gas generation intensity was observed at several temperature values. The results are well-correlated with the inclination to form surface defects of casts made in furnace resin bonded sands. This is the first study on gas generation kinetics in the mass heating temperature function.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 105-109
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting of Al-Si alloys in the full-mould technology. Process conditions
    Odlewania stopów Al-Si w technologii pełnej formy. Uwarunkowania procesu
    Autorzy:
    Mocek, J.
    Zych, J.
    Krubnik, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/264207.pdf
    Data publikacji:
    2014
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    full-mould
    strength
    permeability
    gas evolution tendency
    coatings
    pełna forma
    powłoki
    wytrzymałość
    rozpuszczalność
    gazotwórczość
    Opis:
    A review of various technologies using expendable casting patterns made of expanded polystyrene isgiven in the paper.The resultsof our own investigations on implementing this technology at the pilot-plant scale - for the art castings series - were presented. The results of tests of materials and moulds applied in the full-mould technology were shown. Gas evolution tendencies of expanded polystyrenes and protective coatings were estimated. Gas evolutions were described as functions of the polystyrene heating temperature. The tests of protective coatings used in this technology were performed and strength (Rm), permeability (P), and gas evolution tendency of these coatings assessed. New solutions developed by the team of researchers were applied in testing coating strength, permeability, and the gas evolution tendency of expanded polystyrene. A good correlation between the results of coating properties and the obtained casting quality was found. Coatings, which were characterised by higher strengths and better permeability, allowed us to produce castings without surface or inner faults.
    Dynamiczny rozwój produkcji odlewów w technologii „pełnej formy" wymaga szybkiej optymalizacji procesu technologicznego dla nowych kształtów odlewów. Wykonanie dobrych odlewów wymaga starannego doboru odpowiednich materiałów formierskich. W tym celu zaproponowano metodykę pomiarową dla wybranych, podstawowych parametrów materiałów formierskich. Określono wytrzymałość powłokochronnych Rm, przepuszczalność powłok i gazotwórczość styropianu, jak również zaproponowano zmodyfikowaną wersję badań gazotwórczości materiałów dla modeli stosowanych w technologii„lost foam". Określono kinetykę wydzielania gazów w funkcji temperatury dla wybranej grupy spienionych polistyrenów. Stwierdzono dobrą korelację pomiędzy wytrzymałością i przepuszczalnością a uzyskiwaniem dobrych („zdrowych") odlewów. Powłoki cechujące się wysoką wytrzymałością i przepuszczalnością pozwalają na produkcję odlewów bez wad. Potwierdzono to, wykonując serię próbnych odlewów ze stopu Al-SI.
    Źródło:
    Metallurgy and Foundry Engineering; 2014, 40, 3; 161-174
    1230-2325
    2300-8377
    Pojawia się w:
    Metallurgy and Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Kinetics of Gases Emission from Surface Layers of Sand Moulds
    Autorzy:
    Zych, J.
    Mocek, J.
    Kaźnica, N.
    Powiązania:
    https://bibliotekanauki.pl/articles/382829.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    surface layer
    gases
    kinetics of gas emission
    chemical binders
    piasek formierski
    warstwa powierzchniowa
    gazy
    emisja gazów
    środki wiążące
    Opis:
    Gas emission from casting moulds, cores and coatings applied for sand and permanent moulds is one of the fundamental reasons of casting defects occurrence. In the previous studies, gas emission was measured in two ways: normalized, in which the evolving gas volume was measured during heating of the moulding sand sample in a sealed flask, or by measuring the amount of gas from sand core (sample) which is produced during the pouring of liquid metal. After the pouring process the sand mould is heated very unequally, the most heated areas are layers adjacent to the liquid metal. The emission of gas is significantly larger from the surface layer than from the remaining ones. New, original method of measuring kinetics of gas emission from very thin layers of sand moulds heated by liquid metal developed by the authors is presented in the hereby paper. Description of this new method and the investigation results of kinetics of gas emission from moulding sand with furan and alkyd resin are shown. Liquid grey cast iron and Al-Si alloy were used as a heat source in the sand moulds. Comparison of the kinetics of gas emission of these two kinds of moulding sands filled with two different alloys was made. The momentary metal temperature in sand mould was assigned to the kinetics of gas emission, what creates a full view of the possibility of formation of casting defects of the gaseous origin. Moulding sand with alkyd resin is characterized by larger gas emission; however gases are emitted slower than in the case of moulding sands with furan resin. This new investigation method has a high repeatability and is the only one which gives a full view of phenomenon’s in the surface layer which determines quality of the casings. The obtained results are presented on several graphs and analyzed in detail. They have a great application value and can be used in the production of iron as well as light metal alloy castings.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 222-226
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gases Emission From Surface Layers of Sand Moulds and Cores Stored Under the Humid Air Conditions
    Autorzy:
    Kaźnica, N.
    Zych, J.
    Mocek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/381317.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    surface layer
    sand mould
    emission of gases
    high air humidity
    moulding sand
    chemical binder
    warstwa wierzchnia
    forma piaskowa
    emisja gazów
    wysoka wilgotność powietrza
    masa formierska
    spoiwo chemiczne
    Opis:
    A large number of defects of castings made in sand moulds is caused by gases. There are several sources of gases: gases emitted from moulds, cores or protective coatings during pouring and casting solidification; water in moulding sands; moisture adsorbed from surroundings due to atmospheric conditions changes. In investigations of gas volumetric emissions of moulding sands amounts of gases emitted from moulding sand were determined - up to now - in dependence of the applied binders, sand grains, protective coatings or alloys used for moulds pouring. The results of investigating gas volumetric emissions of thin-walled sand cores poured with liquid metal are presented in the hereby paper. They correspond to the surface layer in the mould work part, which is decisive for the surface quality of the obtained castings. In addition, cores were stored under conditions of a high air humidity, where due to large differences in humidity, the moisture - from surroundings - was adsorbed into the surface layer of the sand mould. Due to that, it was possible to asses the influence of the adsorbed moisture on the gas volumetric emission from moulds and cores surface layers by means of the new method of investigating the gas emission kinetics from thin moulding sand layers heated by liquid metal. The results of investigations of kinetics of the gas emission from moulding sands with furan and alkyd resins as well as with hydrated sodium silicate (water glass) are presented. Kinetics of gases emissions from these kinds of moulding sands poured with Al-Si alloy were compared.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 79-84
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Thermal Conductivity of Moulding Sand with Chemical Binders, Attempts of its Increasing
    Przewodność cieplna mas formierskich ze spoiwami chemicznymi, próby jej zwiększenia
    Autorzy:
    Zych, J.
    Mocek, J.
    Snopkiewicz, T.
    Jamrozowicz, Ł.
    Powiązania:
    https://bibliotekanauki.pl/articles/351198.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal conductivity
    moulding sands
    investigation methods
    binders
    przewodność cieplna
    masa formierska
    metody badań
    spoiwa
    Opis:
    The investigation results of the thermal conductivity of the selected group of moulding sands with chemical binders, mainly organic, are presented in the hereby paper. Studies encompassed also moulding sands into which additions improving the thermal conductivity were introduced. Two testing methods were applied, i.e. investigations at a steady and unsteady temperature zone. For investigations at a steady temperature zone the new original experimental stand was designed and built, adapted also for testing moulding sands with binders undergoing destruction at relatively low temperatures.
    W pracy przedstawiono wyniki badań zdolności do przewodzenia ciepła wybranej grupy mas ze spoiwami, głównie organicznymi. Badaniami objęto również masy, do których wprowadzono dodatki dla zwiększenia przewodności cieplnej. Zastosowano dwie metody badań przewodności cieplnej, tj. badania w ustalonym polu temperatury i badania w nieustalonym polu. Dla badań w stacjonarnym polu zbudowano nowe, oryginalne stanowisko pomiarowe, dostosowane do badań mas ze spoiwami ulegającymi destrukcji w stosunkowo niskiej temperaturze (spoiwa organiczne). Wyniki badań przedstawiono graficznie w układzie: λ = f(T) - współczynnik przewodzenia w funkcji temperatury. Wykazano istnienie minimum funkcji w temperaturze niższej niż w przypadku mas klasycznych. Wprowadzanie do masy dodatku grafitu zwiększa jej przewodność. Wprowadzenie grafitu nie wpływa istotnie na proces wiązania mas furanowych. Masy ze szkłem wodnym charakteryzują się lepszą przewodnością, szczególnie w wyższych (T>400°C) temperaturach.
    Źródło:
    Archives of Metallurgy and Materials; 2015, 60, 1; 351-357
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gas Evolution Rates of Graphite Protective Coatings in Dependence on the Applied Solvent and Kind of Atmosphere
    Autorzy:
    Kmita, A.
    Drożyński, D.
    Mocek, J.
    Roczniak, A.
    Zych, J.
    Holtzer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/353353.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    emission of gases
    protective coatings
    environmental
    Opis:
    The results concerning emission of gases from two commercial graphite protective coatings for moulds and cores (water and alcoholic) are given in the hereby paper. Investigations were performed in two systems. One of the systems was corresponding to conditions occurring inside the mould cavity immediately after its pouring with liquid metal (Method 1), while the second was simulating conditions deep inside the mould at a certain distance from the casting (Method 2). Investigations were carried out in the CO2 atmosphere and in the air. The water protective coating generated 1.5 to 3 times larger volume of gases than the alcoholic coating (in dependence on the measuring method and atmosphere). The smallest differences occurred in the air atmosphere, while the largest in the CO2 atmosphere.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 4; 2129-2134
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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