Autor: Roczniak, A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

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

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Skocz do pozycji: 2.

Tytuł:: Implementation of Nanoparticles in Materials Applied in Foundry Engineering
Autorzy:: Kmita, A.
Roczniak, A.
Powiązania:: https://bibliotekanauki.pl/articles/381634.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innovative technologies
nanoparticles
materials
foundry
innowacyjne technologie
nanocząsteczki
materiały odlewnicze
odlewnictwo
Opis:: The ceaseless progress of nanotechnology, observed in the last years, causes that nanomaterials are more and more often applied in several fields of industry, technique and medicine. E.g. silver nanoparticles are used in biomedicine for disinfection and polymer nanoparticles allow insulin transportation in pharmacology. New generation materials containing nanoparticles are also used in the chemical industry (their participation in the commercial market equals app. 53 %). Nanomaterials are used in electronics, among others for semiconductors production (e.g. for producing nanoink Ag, which conducts electric current). Nanomaterials, due to their special properties, are also used in the foundry industry in metallurgy (e.g. metal alloys with nanocrystalline precipitates), as well as in investment casting and in moulding and core sand technologies. Nanoparticles and containing them composites are applied in several technologies including foundry practice, automotive industry, medicine, dentistry etc. it is expected that their role and market share will be successively growing.
Źródło:: Archives of Foundry Engineering; 2017, 17, 3; 205-209
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Nowe żywice furfurylowe bardziej przyjazne dla środowiska
New Furfuryl Resins More Environmentally Friendly
Autorzy:: Holtzer, M.
Kmita, A.
Roczniak, A.
Powiązania:: https://bibliotekanauki.pl/articles/383314.pdf
Data publikacji:: 2014
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: innowacyjne materiały
technologie odlewnicze
żywice furfurylowe
ochrona środowiska
innovative materials
foundry technologies
furfuryl resin
environmental protection
Opis:: Coraz ostrzejsze przepisy w zakresie ochrony środowiska wymuszają na producentach materiałów dla przemysłu odlewniczego opracowywanie nowych produktów, bardziej przyjaznych dla środowiska. Jednym z takich produktów są żywice furfurylowe, które obecnie mają największy udział w grupie mas no-bake. Wprowadzone w ostatnich latach w UE przepisy dotyczące ograniczenia zawartości wolnego alkoholu furfurylowego (< 25%) w żywicach oraz naciski w kierunku redukcji emisji SO₂, formaldehydu, fenolu, benzenu i toluenu, jak również związków z grupy WWA, szczególnie na stanowiskach pracy spowodowały pojawienie się na rynku nowej generacji żywic furfurylowch oraz katalizatorów (o zmniejszonej zawartości siarki lub bezsiarkowych). W artykule dokonano analizy wpływu tych nowych produktów stosowanych w technologii mas z żywicami furfurylowymi na środowisko i warunki pracy.
More and more strict regulations, concerning the environment protection, force the producers of materials for foundry industry to develop new products, more friendly for the environment. One of such products are furfuryl resins, which currently have the largest share within the group of no-bake moulding sands. Regulations introduced in the last years in the European Union concerning limitations of a free furfuryl alcohol content (< 25%) in resins as well as pressures to reduce SO₂, formaldehyde, phenol, benzene, toluene and compounds from the PAHs group emissions, especially at work stands, caused an appearance of the new generation of furfuryl resins and catalysts (of a decreased sulphur content or even sulphur-free). The analysis of the influence of these new products, applied in the moulding sands with furfuryl resins technology, on the environment and work conditions was performed in the hereby paper.
Źródło:: Archives of Foundry Engineering; 2014, 14, 4 spec.; 47-50
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: The Recycling of Materials Containing Iron and Zinc in the OxyCup Process
Autorzy:: Holtzer, M.
Kmita, A.
Roczniak, A.
Powiązania:: https://bibliotekanauki.pl/articles/382832.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: recycling
iron
zinc
modern technologies
wastes
recykling
żelazo
cynk
nowoczesna technologia
odpady
Opis:: Environmentally friendly and economically profitable technologies, enabling utilisation of wastes from metallurgical processes and regeneration of Fe and Zn contained in them, are looked for. This allows also saving of natural resources such as ores. Several techniques have been developed and introduced for recycling sludge and dust that contain iron and zinc. Currently, there are three major ways to treat zinc -bearing dust: rotary hearth furnaces method (the FASTMET process), rotary kiln method (the Waelza process), shaft furnace method (the OXYCUP method). This technology can be used to fully recycle metallurgical wastes such as slag crusts or metal-bearing fractions of desulfurization slags without the need for additional preparation of these materials, dust, sludge and scale generated in different stages of iron and steelmaking. The OXYCUP process described in paper combines the function of melting in traditional cupola furnaces (CF) with function of reduction in blast furnaces (BF).
Źródło:: Archives of Foundry Engineering; 2015, 15, 1 spec.; 126-130
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Piroliza utwardzonej żywicy fenolowo-formaldehydowej typu rezolowego - identyfikacja produktów metodą GC/MS
Pyrolysis of the Cured Phenol-Formaldehyde Resole Resin - Identification of the Products by GC/MS
Autorzy:: Kmita, A.
Roczniak, A.
Holtzer, M.
Powiązania:: https://bibliotekanauki.pl/articles/382923.pdf
Data publikacji:: 2015
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: ochrona środowiska
lotne związki organiczne
niebezpieczne zanieczyszczenia powietrza
technologia Alphaset
technika Py-GC/MS
technologia odlewnicza
environment protection
volatile organic compounds
hazardous air pollutants
alpha-set technology
Py-GC/MS
foundry technology
Opis:: Celem badań była identyfikacja głównych produktów pirolizy utwardzonego spoiwa stosowanego w technologii ALPHASET w zależności od temperatury rozkładu. Rozkład termiczny próbek prowadzono przy użyciu pirolizera w temperaturze: 700, 900 i 1100 °C w atmosferze helu o czystości 99,9999. Identyfikację produktów pirolizy prowadzono z wykorzystaniem techniki GC/MS. Okazało się, że temperatura 900 °C jest tą, w której powstaje najwięcej produktów pirolizy. W temperaturze 700 i 900 °C znaczny udział wśród produktów pirolizy ma dwutlenek węgla, który powstaje w wyniku rozkładu węglanu propylenu, będącego prawdopodobnie składnikiem mieszaniny estrów.
The aim of the investigations was the identification of the main products of the pyrolysis of the hardened binder - applied in the ALPHASET technology - in dependence on the decomposition temperature. The thermal decomposition of samples was performed by means of the pyrolyzer at temperatures: 700, 900 and 1100°C in the atmosphere of helium (He) of the purity: 99.9999. This identification was performed by means of the GC/MS technique. It occurred that the temperature of 900°C is the one at which the highest amount of the pyrolysis products is formed. At temperatures of 700 and 900°C among the pyrolysis products there is a significant fraction of carbon dioxide, which is formed as the result of the decomposition of propylene carbonate, which is probably the component of the esters mixture.
Źródło:: Archives of Foundry Engineering; 2015, 15, 4 spec.; 67-72
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Research of Emission of Commercial Binders Used in ALPHASET Technology - Estimated Quantitative Analysis
Autorzy:: Roczniak, A.
Holtzer, M.
Kmita, A.
Powiązania:: https://bibliotekanauki.pl/articles/383333.pdf
Data publikacji:: 2018
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: environment protection
foundry engineering
ALPHASET technology
Py-GC/MS
BTEX emission
ochrona środowiska
inżynieria odlewnicza
technologia ALPHASET
emisja BTEX
Opis:: The results of investigations of three commercial binders applied in the Alphaset technology marked as: Sample E , Sample T and Sample S are presented in the hereby paper. These samples were subjected to the pyrolysis process at a temperature of 900°C (inert atmosphere, He 99.9999). The gas chromatograph coupled with the mass spectrometer and pyrolizer (Py-GC/MS) were used in the study. The identification of gases emitted during the thermal decomposition was performed on the basis of the mass spectral library. The obtained results indicate a certain diversification of emitted gases. Among the pyrolysis products the following harmful substances were identified: furfuryl alcohol, formaldehyde, phenol and also substances from the BTEX (benzene, toluene and ethylobezneze and xylenes) PAHs (Polycyclic Aromatic Hydrocarbons) and VOC groups (Volatile Organic Compounds). Therefore, from the environment protection point of view performing systematic investigations concerning the harmfulness of binders applied in the moulding and core sands technology, is essential.
Źródło:: Archives of Foundry Engineering; 2018, 18, 1; 109-114
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Influence of Reclamation Process on the Ecological Quality of Reclaim Sand
Autorzy:: Dereń, M.
Łucarz, M.
Roczniak, A.
Kmita, A.
Powiązania:: https://bibliotekanauki.pl/articles/380811.pdf
Data publikacji:: 2017
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: thermal reclamation
loss of ignition
molding sand
elution analysis
environment protection
regeneracja termiczna
strata prażenia
masa formierska
ochrona środowiska
Opis:: In this article, there were presented results of research on influence of reclamation process on the ecological quality of reclaim sand with furan resin used in nonferrous foundry. The quality of reclaimed sand is mainly define by two group of chemical substances from elution of reclaimed sand: Dissolves Organic Carbon (DOC) and Total Dissolves Solids (TDS). Reclaimed sand used in test was prepared in experimental thermal reclaimer and mechanical vibration reclaimer REGMAS installed in Faculty of Foundry Engineering at University of Science and Technology in Krakow. The reference point is molding sand shaking out and crumble in jaw crusher. Test of elution was made in acreditation laboratory in Center For Research and Environmental Control in Katowice up to the standard with Dissolves Organic Carbon (DOC) - PN-EN 1484:1999; Total Dissolves Solids (TDS) - PN-EN 15216:2010. The standard for elution test is PN-EN 12457- 4:2006. Except that we were made loss of ignition test, to check how many resin was rest on sand grains.
Źródło:: Archives of Foundry Engineering; 2017, 17, 4; 43-46
1897-3310
2299-2944
Pojawia się w:: Archives of Foundry Engineering
Dostawca treści:: Biblioteka Nauki

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