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    Wyświetlanie 1-7 z 7
    Tytuł:
    Nanocomposites Based on Water Glass Matrix as a Foundry Binder: Chosen Physicochemical Properties
    Autorzy:
    Kmita, A.
    Roczniak, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/383127.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technologie innowacyjne
    szkło wodne
    nanocząsteczki
    lepkość
    innovative technologies
    water glass
    nanoparticles
    wettability
    viscosity
    Opis:
    The nanocomposites based on water glass matrix were attempted in the study. Nanoparticles of ZnO, Al2O3 or MgO in organic solutions were applied into water glass matrix in the amounts of: 1.5; 3; 4 or 5 mas. %. Wettability of the quartz sad by the nanocomposites based on water glass matrix was determined by testing changes of the wetting angle θ in time τ for the system: quartz – binder in non-stationary state, by means of the device for measuring wetting angles. Wettability measurements were carried out under isothermal conditions at an ambient temperature (20 – 25 oC). The modification improves wettability of quartz matrix by water glass, which is effective in improving strength properties of hardened moulding sands. Out of the considered modifiers in colloidal solution of propyl alcohol water glass modified by MgO nanoparticles indicated the smallest values of the equilibrium wetting angle θr. This value was equal app. 11 degrees and was smaller no less than 40 degrees than θr value determined for not modified water glass. Viscosity η of nanocomposites based on water glass matrix was determined from the flow curve, it means from the empirically determined dependence of the shearing stress τ on shear rate γ: τ = f (γ) (1), by means of the rotational rheometer. Measurements were carried out at a constant temperature of 20 oC. The modification influences the binder viscosity. This influence is conditioned by: amount of the introduced modifier as well as dimensions and kinds of nanoparticles and organic solvents. The viscosity increase of the modified binder does not negatively influence its functional properties.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 1; 93-98
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of water glass modification on its viscosity and wettability of quartz grains
    Autorzy:
    Kmita, A.
    Hutera, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/380220.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szkło wodne
    synteza termiczna
    nanocząstka ZnO
    lepkość
    zwilżalność
    water glass
    modification
    thermal synthesis
    ZnO nanoparticles
    viscosity
    wettability
    Opis:
    The aim of the present study was to develop a modifier for water glass. The method of thermal generation of metal oxide nanoparticles was adapted and used in the research. Nanoparticles of ZnO from the thermal decomposition of basic zinc carbonate were used. A method for the modifier introduction was developed, and the effect of modifier content and organic solvent type on the physico-chemical properties of binder (viscosity) and quartz wettability was determined. Binder viscosity was examined from the flow curves plotted with the help of a RHEOTEST 2 rotational rheometer equipped with proper software. Quartz wettability was determined examining time-related changes in the value of the contact angle in a quartz-binder system, until full stabilisation of the angle value has been achieved. Binder modification was carried out on sodium water glass designated as R"145". The water glass modifiers were suspensions of ZnO nanoparticles in propanol and methanol at a fixed concentration of c = 0.3 M and with the size of nanoparticles comprised in a range of <61 - 981 nm>. Water glass modification with the suspensions of ZnO nanoparticles in methanol and propanol showed the effect of modifier on the water glass viscosity and quartz wettability. This effect depends on the type of alcohol used. The ZnO suspension in propanol (alcohol with a longer hydrocarbon chain) affects more strongly the viscosity of binder and quartz wettability than the methanol suspension.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 59-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of water glass modification with nanoparticles of zinc oxide on selected physical and chemical properties of binder and mechanical properties of sand mixture
    Autorzy:
    Kmita, A.
    Hutera, B.
    Olejnik, E.
    Janas, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/381352.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    thermal synthesis
    ZnO nanoparticles
    wettability
    tensile strength
    moulding sand
    synteza termiczna
    nanocząsteczki ZnO
    wytrzymałość na rozciąganie
    masa formierska
    Opis:
    In this paper, an attempt was made to use the ZnO nanoparticles as a modifier of foundry binder - water glass. The modifier was a colloidal suspension of the ZnO zinc oxide nanoparticles in propanol. A thermal method to obtain metal oxide nanoparticles was adopted. The modifier was product of the thermal decomposition of the basic zinc carbonate ([ZnCO3]2•[Zn(OH)2]3), and was introduced into the water glass in an amount of 1 and 3 wt%. To determine the interfacial reactions taking place in a quartz - modified water glass system, the binder wettability of the quartz grains was measured. The effect of water glass modification on the mechanical properties of moulding sands was verified by testing the tensile strength Rmu of moulding sands with the modified binders. Water glass modification with the colloidal solution of ZnO nanoparticles in propanol confirmed the effect of modifier on the water glass wettability of sand grains and on the mechanical properties of the sand mixtures with this additive.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 2s; 37-40
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wettability of the System of Cast Iron and Magnesia Ceramics with Graphite
    Autorzy:
    Hosadyna-Kondracka, Małgorzata
    Nowak, Rafał
    Turalska, Patrycja
    Bruzda, Grzegorz
    Boroń, Łukasz
    Wawrylak, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2174618.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    composites
    metal-ceramic bonding
    wettability
    sessile drop method
    cast iron
    kompozyty
    wiązanie metal-ceramika
    zwilżalność
    metoda osiadłej kropli
    żeliwo
    Opis:
    In this paper examinations of high-temperature wetting tests of 3 systems of liquid alloy – cast iron in contact with ceramic materials: magnesia ceramics in combination with natural graphite were presented. After wettability testing, the microscopic observations of the morphology of the sample surface and the cross-section microstructure with the chemical composition in micro-areas were examined. One of the objective of this work was also to verify whether the graphite content would affect the wettability of the magnesia ceramics. The study of high-temperature wetting kinetics of the liquid alloy in contact with the ceramic material, by the "sessile drop" method with capillary purification (CP) procedure was conducted. Under the test conditions, at a temperature of 1450°C and time 15 minutes, all 3 experimental systems showed a non-wetting behaviour. The average contact angle for the system with cast iron drop on magnesia ceramics was 140°, on magnesia ceramics with 10 parts per weight of graphite was 137° and on magnesia ceramics with 30 parts per weight of graphite - 139°. Microscopic observations revealed that in the case of the sample consisting of the cast iron drop on the substrate with magnesia ceramics, the formation of fine separations was not observed, unlike the systems with the substrate with magnesia ceramics and the addition of natural graphite. Numerous, fine droplets accumulate on the graphite flakes and consist mainly of Si as well as Fe and O. On the other hand, the rough MgO grains have a gray, matt surface, without fine separations. The conducted observations indicate the mechanical nature of the bonding - liquid metal penetrates into the pores of the rough ceramics of the substrate. However, in the case of systems of cast iron drop with magnesia ceramics and addition of graphite, probably the adhesive connection and the physical attraction of elements derived from cast iron drop with the flake graphite appeared as well.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 3; 25--33
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wettability and Surface Free Energy of Ti(C,N) Coatings on Nickel-based Casting Prosthetic Alloys
    Autorzy:
    Banaszek, K.
    Klimek, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/381148.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    dental alloy
    wettability
    contact angle
    surface tension
    surface free energy
    stop dentystyczny
    zwilżalność
    kąt zwilżania
    napięcie powierzchniowe
    energia powierzchniowa swobodna
    Opis:
    The production process of prosthetic restorations runs in two stages. In the first stage, the prosthetic foundation is produced of metal alloys. In the second stage, a facing material is applied on the produced element. In both stages, the wettability is significantly important, as well as the free surface energy relating to it. The quality of the obtained cast depends on the surface phenomena occurring between the metal alloy and the material of which the casting mould is made. The performed examinations also point to a relation between the ceramics joint and the base, depending on the wetting angle. The aim of the presented paper was to examine influence of the composition of a Ti(C,N)-type coating on bases made of the Ni-Cr prosthetic alloy on the wettability and the surface free energy. The test material were disks made of the Ni-Cr alloy with the diameter of 8 mm. The disks were divided into five groups, which were covered with Ti(C,N) coatings, with different amounts of C and N in the layer. In order to determine the surface free energy (γs), the wetting angle was measured. Two measure liquids were applied: distilled water and diiodomethane. The obtained results of the measurements of the water-wetting angles suggest that together with the increase of the ratio of nitrogen to carbon in the Ti(C,N) coating, the surface hydrophobicity increases as well. In all the samples, one can see a large difference between the energy values of the polar and the apolar components. The high values of the polar components and the low values of the apolar ones make it possible to conclude that these surfaces exhibit a greater affinity to the polar groups than to the apolar ones. On the basis of the analysis of the surface free energy, one can state that covering the alloy with Ti(C,N)-type coatings should not decrease the adhesion of the ceramics to the alloy, whereas TiC coatings should lead to the latter’s improvement. Due to their hydrophilicity, TiC coatings should decrease the adhesion of bacteria to the surface and hinder the formation of a bacterial biofilm.
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 3; 11-16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Wpływ modyfikacji szkła wodnego na jego lepkość i zwilżalność osnowy kwarcowej
    Influence of modification a water glass on its viscosity and wettability of the sand matrix
    Autorzy:
    Kmita, A.
    Hutera, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/379931.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szkło wodne
    synteza termiczna
    nanocząstka ZnO
    lepkość spoiwa
    zwilżalność spoiwa
    water glass
    thermal synthesis
    ZnO nanoparticle
    sand matrix viscosity
    sand matrix wettability
    Opis:
    Przedmiotem pracy jest opracowanie modyfikatora szkła wodnego. Do badań zaadaptowano termiczną metodę wytwarzania nanocząstek tlenku metalu. Wykorzystano nanocząstki ZnO pochodzące z rozpadu termicznego. Opracowany został sposób wprowadzenia modyfikatora oraz wpływ jego ilości, rodzaju organicznego rozpuszczalnika na właściwości fizykochemiczne spoiwa tj. lepkości i zwilżalność kwarcu. Lepkość spoiw określono wyznaczając krzywe płynięcia za pomocą reometru rotacyjnego RHEOTEST 2 z oprogramowaniem. Zwilżalność kwarcu określano badając zmiany wartości kąta zwilżania w czasie dla układu: kwarc-spoiwo, aż do stabilizacji wartości kąta. Modyfikację spoiwa przeprowadzono na szkle wodnym sodowym: R „145”. Modyfikatorami szkła wodnego były: zawiesiny nanocząstek ZnO w propanolu i metanolu ostałym stężeniu c=0,3 M i wielkości nanocząstek w przedziale <61–981 nm>. Modyfikacja szkła wodnego zawiesinami nanocząstek ZnO w metanolu i propanolu wykazała wpływ modyfikatora na oddziaływanie lepkie i międzyfazowe kwarc – spoiwo. Wpływ ten zależy od rodzaju alkoholu. Zawiesina ZnO w alkoholu o dłuższym łańcuchu węglowodorowym (propanol) silniej oddziaływuje na lepkość i zwilżalność w porównaniu z zawiesiną w metanolu.
    The paper is to develop a water glass modifier. The study adapted the method of thermal producing of metal oxide nanoparticles. Were used ZnO nanoparticles from thermal decomposition of basic zinc carbonate. It was developed as the introduction of the modifier and the impact of the amount, type of organic solvent on physicochemical properties such as viscosity of the binder and wettability of quartz. Determining the viscosity binders flow curves identified using a rotational rheometer RHEOTEST 2 with software. Wetting of quartz was determined examining change the value of contact angle in time for the system quartz-binder, to stabilize the value of the angle. The modification of the binder was carried out sodium water glass: R "145". Water glass modifiers were suspensions of ZnO nanoparticles in propanol and methanol, concentration of suspension 0.3 M and the size of nanoparticles in the range of <61-981 nm>. Modification of water-glass suspensions of ZnO nanoparticles in methanol and propanol showed the impact modifier to the effects of viscous and interfacial quartz - a binder. This effect depends on the type of alcohol. ZnO suspension in alcohol with a longer hydrocarbon chain (propanol) strongly influences the viscosity and wettability compared with the suspension in methanol.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 103-106
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Water glass modification and its impact on the mechanical properties of moulding sands
    Autorzy:
    Kmita, A.
    Hutera, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/382871.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative materials
    innovative foundry technology
    ZnO nanoparticle
    viscosity
    wettability
    cohesion
    sand strength Rmu
    innowacyjne materiały odlewnicze
    innowacyjne technologie odlewnicze
    nanocząstka ZnO
    lepkość
    zwilżalność
    kohezja
    wytrzymałość Rmu masy
    Opis:
    The purpose of the presented experiment was to develop an effective water glass modifier. In the conducted research, an attempt was made to determine the effect of modifier addition on the wettability of quartz grains, viscosity and cohesion of binder and strength Rmu of the sand mixture. Water glass modification was carried out with, obtained in electrochemical process [1], colloidal suspension of ZnO nanoparticles in methanol (modifier I) or propanol (modifier II), characterised by a constant molar concentration of c = 0.3 M. It was demonstrated that the addition of a colloidal suspension of ZnO nanoparticles in propanol (modifier II) had a significant effect on wettability of quartz grains improvement without the accompanying increase in binder viscosity. Testing the mechanical properties Rmu of sand mixtures containing modified binder (modifier II) hardened at ambient conditions showed an approximately 28% increase in strength compared with the Rmu of the sand bonded with an unmodified binder.
    Celem badań zaprezentowanego eksperymentu było opracowanie skutecznego modyfikatora szkła wodnego. Przeprowadzone badania miały na celu określenie wpływu dodatku modyfikatora na: zwilżalność kwarcu przez szkło wodne, lepkość i kohezję spoiwa oraz wytrzymałość Rmu masy. Do modyfikacji szkła wodnego zastosowano koloidalne zawiesiny nanocząstek ZnO otrzymanych w procesie elektrochemicznym [1] w metanolu (modyfikator I) lub w propanolu (modyfikator II) o stałym stężeniu molowym c = 0,3 M. Wykazano, że dodatek w postaci koloidalnej zawiesiny nanocząstek ZnO w propanolu (modyfikator II) wpływał znacząco na poprawę zwilżalności ziaren kwarcu nie zwiększając równocześnie lepkości spoiwa. Weryfikacja właściwości wytrzymałościowych Rmu mas z dodatkiem spoiwa modyfikowanego (modyfikator II) utwardzanych w warunkach otoczenia wykazała ok. 28% wzrost wytrzymałości w porównaniu z Ruu masy ze spoiwem niemodyfikowanym.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 2; 81-84
    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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