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    Wyświetlanie 1-7 z 7
    Tytuł:
    Application of Non-Silica Sands for High Quality Castings
    Autorzy:
    Beňo, J.
    Poręba, M.
    Bajer, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/2049437.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    non-silica sands
    chromite sand
    furan no-bake
    Opis:
    The goal of this article is to application of non-silica sands based on alumininosilicates as an alternative of traditionally used chromite sand for alloyed steel and iron castings. Basic parameters as bulk density, pH value of water suspension, refractoriness, grain shape of the testing sands were evaluated. Also mechanical properties of furan no-bake moulding mixtures with testing sand were determined. Finally, the influence of non-silica sand on casting quality was evaluated via semi-scale under normal casting production for sand characterization. Optimization of production process and production costs were described.
    Źródło:
    Archives of Metallurgy and Materials; 2021, 66, 1; 25-30
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Relationship Between Bake Hardening, Snoek-Köster and Dislocation-Enhanced Snoek Peaks in Coarse Grained Low Carbon Steel
    Autorzy:
    Lin, W.
    Zhao, S.
    Zhang, H.
    Jin, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/353663.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    low carbon steel
    ultra-low carbon bake-hardening (ULC-BH) steel
    bake hardening (BH)
    Snoek peak
    dislocation-enhanced Snoek peak
    Snoek-Köster peak
    internal friction
    Opis:
    In the present work, specimens prepared from coarse grained low carbon steel with different prestrains were baked and then, their bake hardening (BH) property and internal friction were determined. TEM was used to characterize the dislocation structure in BH treated samples. The measurements of internal friction in prestrained samples and baked samples were carried out using a multifunctional internal friction apparatus. The results indicate that, in coarse grained low carbon steel, the bake hardening properties (BH values) were negative, which were increased by increasing the prestrain from 2 to 5%, and then were decreased by increasing the prestrain from 5 to 10%. In the specimen with prestrain 5%, the BH value reached the maximum value and the height of Snoek-Köster peak was observed to be the maximum alike. With increasing the prestrain, both of the BH value and Snoek-Köster peak heights are similarly varied. It is concluded that Snoek-Köster and dislocation-enhanced Snoek peaks, caused by the interactions between interstitial solute carbon atoms and dislocations, can be used in further development of the bake hardening steels.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 3; 1723-1732
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification and Quantification of Gases Releasing from Furan no Bake Binder
    Autorzy:
    Acharya, S. G.
    Vadher, J. A.
    Kanjariya, P. V.
    Powiązania:
    https://bibliotekanauki.pl/articles/379863.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    furan
    GC-MS
    FTIR
    binder
    pyrolysis
    furan no bake
    spoiwo
    piroliza
    Opis:
    Sand samples with furan binder were prepared using Sand, Furfuryl Alcohol and Toluene Sulfonic Acid with ratio 100:0.85:0.30. To identify and quantify gases releasing from furan binder various studies like FTIR, TGA and GC-MS were carried out. After analyzing our materials using above mentioned characterizations the chemical formula of the Resin and Binder and amount of gases releasing from composition were confirmed. After studying various reports on pyrolysis process of furan binder calculation of the % of various gases emitting during pyrolysis process of furan was carried out. Sample of gas collected from mold was analyzed using GC-MS. Based on GC-MS measurement various gases emitting from furan sand mold were identified and their amount were calculate and compared with the international standers of permissible gas emission limits in a foundry. The purpose of this paper is to assist foundries in pollution prevention by devising clean technologies which maintain or improve the quality of ambient surrounding. This paper aimed at minimization of pollution of air by using various techniques.
    Źródło:
    Archives of Foundry Engineering; 2016, 16, 3; 5-10
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Zakres i warunki stosowania suspensji węglowo-wodnych
    The scope and conditions of using coal-water suspensions
    Autorzy:
    Hycnar, J. J.
    Szymanek, A.
    Michalik, A.
    Kula, H.
    Trąbka, S.
    Fraś, A.
    Sikora, L.
    Foltyn, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/970893.pdf
    Data publikacji:
    2014
    Wydawca:
    AXIS MEDIA
    Tematy:
    suspensja węglowo-wodna
    kocioł
    piec
    opalanie
    paliwo
    spalanie
    coal-water suspensions
    cauldron
    bake
    fuel
    combustion
    Opis:
    W  ostatnich latach rośnie zainteresowanie produkcją i  stosowaniem suspensji węglowo-wodnej do opalania kotłów i pieców, jako zamiennika olejów opałowych i  gazu ziemnego oraz węgla. Działania te mają na celu obniżenie kosztów wytwarzania energii, a  w  przypadku zastępowania węgla obniżenie emisji zanieczyszczeń do środowiska. Przedstawiony materiał omawia wyniki badań i  prób nad opracowaniem przemysłowej technologii produkcji suspensji wę- glowo-wodnej. Opracowana technologia, w  porównaniu do powszechnie stosowanych, charakteryzuje się niższymi kosztami wytwarzania suspensji i  prostszym procesem. Właściwości otrzymywanych suspensji zależą od wielu czynników w tym, od jakości zastosowanego węgla, zawartości i stopnia mikronizacji węgla, sposobu mikronizacji i  homogenizacji oraz warunków ich magazynowania. Dla oceny jakości suspensji węglowo-wodnych jako paliwa, najważniejszymi parametrami są: zawartości zmikronizowanego węgla, lepkość, wartość opa- łowa, zapopielenie i  zawartości siarki oraz stabilność zawiesiny. Następnym etapem, prowadzącym do wdrożenia suspensji do opalania kotłów i pieców jest przeprowadzenie prób spalania na wytypowanych obiektach dla ustalenie zakresu ich adaptacji do nowego paliwa oraz weryfikacji zakładanych efektów ekonomicznych i ekologicznych.
    In recent years, there can be observed a growing interest in production and application of the coal-water suspensions for combustion in furnaces and boilers as the substitutes for fuel oil, natural gas and coal. These activities aim at reducing cost of energy generation and in case of substitution of coal – also at reducing the emissions of the pollutants to the environment. The paper presents the results of tests and trials on the development of the industrial technology for production of the coal-water suspension. This technology, in comparison with the commonly used ones, is characterized by lower costs of suspension production and a simpler process flow. The properties of the obtained suspensions depend on many factors such as quality of the used coal, the content and level of coal micronization, the method of micronization and homogenization and the conditions of suspension storage. For evaluating the quality of a coal-water suspension as a fuel the most important parameters are: coal content, viscosity, calorific value, ash and sulfur content, slurry stability. The next phase leading to the application of the slurries for combustion in furnaces and boilers is conducting combustion trials at selected sites what will help in determining the possibilities of their adaptation to the new fuel, as well as in verifying the assumed economic and environmental effects.
    Źródło:
    Piece Przemysłowe & Kotły; 2014, 11-12; 8-14
    2082-9833
    Pojawia się w:
    Piece Przemysłowe & Kotły
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis of Natural Phenolic Compound Contained Alkaline Phenolic Foundry Resin and Its Performance Evaluation on Casting
    Autorzy:
    Güvendik, A. E.
    Ay, Kadir
    Powiązania:
    https://bibliotekanauki.pl/articles/1837733.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    phenolic resins
    lignosulphonates
    sustainability
    foundry
    Alfanol A 72
    No-bake
    performance evaluation
    żywice fenolowe
    lignosulfoniany
    zrównoważony rozwój
    ocena wydajności
    Opis:
    In foundry, metal casting can be done with various methods. One of the most important methods preferred around the world is sand casting. Ester curable alkaline phenolic resins have produced to make sand molds by No-bake systems. They must have specific properties to make sand casting efficient and reliable. Production of these resins depends on some fossil raw-materials like phenol. To investigate more sustainable and green resin synthesis method, lots experiment have been done by substitution of phenol with renewable alternative phenolic materials like resorcinol, lignosulphonates and tannic acid and its derivatives. Different properties of resins were produced with competitive performance with the market product, ÇKE Alfanol A 72 No-Bake Resin. Without loss of performance, calcium lignosulfonate was used in polymer synthesis at the rate of 15% instead of phenol. On the other hand, the reaction in which lignin and resorcinol were combined instead of phenol by reducing it by 25% gave better results in terms of mechanical and thermal properties. Thermal properties were investigated for resorcinol and lignin modified resins by using TGA-DSC and mechanical performance of cured sand core sample were tested by Simpson Sand Strength Testing Machine as compression strength as N/cm2. After laboratory testing casting performance of new resins are compared with two different companies’ resins in steal casting demo. Experimental results were matched with casting trail and no defect was detected.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 2; 46-56
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluate Sulphur Diffusion at Mould-Metal Interface in No- Bake Mould System
    Autorzy:
    Sheladiya, M. V.
    Acharya, S. G.
    Mehta, K.
    Acharya, G. D.
    Powiązania:
    https://bibliotekanauki.pl/articles/381595.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industries
    no-bake technology
    mould-metal interface
    furan resin
    sulphur diffusion
    przemysł odlewniczy
    technologia bez pieca
    żywica furanowa
    dyfuzja
    Opis:
    Casting process takes a major percentage of manufacturing products into consideration. No-bake casting is swiftly developing technology for foundry industries. In the no-bake family, furan no-bake casting process employs resins and acid catalyst to form a furan binder system. However, this process configures castings with augmented strength and quality surface finish. Compressive strength, transverse strength and tensile strength of moulds are also high in this furan binder system. Hence this method is apt for producing accurately dimensioned castings. Our well thought-out deliberations in the subsequent write up entail the numerous effects of variation of resin and acid catalyst on the surface defect i.e. sulfur diffusion on the surface of FNB casting. Furan resin; used in the production of casting is furfuryl alcohol and acid catalyst is sulphonic acid. Sulfur diffusion is tested by Energy-dispersive X-ray spectroscopy (EDX) analysis and also by the spectrometer with jet stream technology. This paper also comprises economic advantages of optimizing resin because furan resin is expensive and catalyst with reduction of sulfur diffusion defect as it saves machining, labor cost, and energy.
    Źródło:
    Archives of Foundry Engineering; 2019, 1; 63-70
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Modern Alphaset (APNB) Flexible Formulations-Enhanced Performance
    Autorzy:
    Ghosh, D. K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837863.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    make molds and cores
    sand binder
    resin performance
    alkaline phenolic no-bake
    APNB
    wytwarzenie form i rdzeni
    spoiwo piaskowe
    właściwości żywic
    Opis:
    APNB (alkaline phenolic no bake), widely known as Alphaset is one of the major sand binder systems used in foundries to make molds and cores without application of heat or gas. This is a two part system comprising of a phenol-formaldehyde resin in alkaline medium as binder and range of esters of dibasic acids and/or polyhydric alcohols as hardeners. Resin performance varies depending upon formulations. Major variables in formulations are mole ratio of phenol: formaldehyde, total alkali content, ratio of two alkalis (NaOH & KOH) and molecular weight of polymers i.e. chain length. In present work, one mole ratio of phenol & formaldehyde has been chosen to prepare 8 resins [...].
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 4; 18-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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