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    Wyświetlanie 1-8 z 8
    Tytuł:
    Effect of Bentonite Clay Addition on the Thermal and Mechanical Properties of Conventional Moulding Sands
    Autorzy:
    Kamińska, J.
    Puzio, S.
    Angrecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/383048.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    bentonite
    bentonite clay
    moulding sand
    montmorillonite
    strength properties
    bentonit
    glinka bentonitowa
    piasek formierski
    montmorylonit
    właściwości wytrzymałościowe
    Opis:
    Bentonites and clays are included in the group of drilling fluids materials. The raw materials are mainly clay minerals, which are divided into several groups, like montmorillonite, kaolinite, illite, biotite, muscovite, nontronite, anorthoclase, microcline, sanidine or rutile, differing in chemical composition and crystal lattice structure. Clay minerals have a layered structure forming sheet units. The layers merge into sheets that build up to form the structure of the mineral. The aim of the studies carried out in the ŁUKASIEWICZ Research Network - Foundry Research Institute is to explore the possibility of using minerals coming from Polish deposits. The article outlines the basic properties of hybrid bentonites, which are a mixture of bentonite clay called beidellite, originating from overburden deposits of the Turoszów Mine, and foundry bentonite from one of the Slovak deposits. As part of the physico-chemical tests of minerals, measurements included in the PN-85/H-11003 standard, i.e. montmorillonite content, water content and swelling index, were carried out. Additionally, the loss on ignition and pH chemical reaction were determined. Based on the thermal analysis of raw materials, carried out in the temperature range from 0 to 1000⁰C, changes occurring in these materials during heating, i.e. thermal stability in contact with liquid metal, were determined. Examinations of the sand mixture based on pure clay and bentonite and of the sand mixture based on hybrid bentonites enabled tracing changes in permeability, compressive strength and tensile strength in the transformation zone as well as compactability referred to the clay content in sand mixture. Selected technological and strength parameters of synthetic sands are crucial for the foundry, because they significantly affect the quality of the finished casting. Based on the analysis of the results, the optimal composition of hybrid bentonite was selected.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 111-116
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Charakterystyka wodnych i alkoholowych powłok ochronnych nowej generacji i ich wpływ na jakość warstwy wierzchniej odlewu
    Characteristics of new generation water and alcohol coatings and their impact on the quality of the casting surface layer
    Autorzy:
    Kamińska, J.
    Angrecki, M.
    Palma, A.
    Puzio, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/391560.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Odlewnictwa
    Tematy:
    powłoki ochronne
    masy formierskie
    stopy żelaza
    jakość powierzchni odlewów
    protective coatings
    moulding sands
    iron alloys
    surface quality of castings
    Opis:
    Rosnące wymagania odbiorców odlewów dotyczące dokładności wymiarowej oraz chropowatości powierzchni odlewów wymuszają na producentach (odlewniach) stosowanie powłok ochronnych na formy i rdzenie. Celem nanoszenia powłok jest: zabezpieczenie przed przypalaniem się (przywarciem) tworzywa formy do odlewu, zmniejszenie chropowatości powierzchni odlewów, ułatwienie usunięcia odlewu z wnęki formy. W artykule przedstawiono wyniki badań nowej generacji powłok wieloskładnikowych, przeprowadzone zgodnie z polską normą PN-H-11011:1997. Zbadano gęstość badanych powłok, zawartość substancji suchej, wskaźnik sedymentacji oraz ilość wydzielanych przez powłoki gazów. Przeprowadzono również wytopy mające na celu określenie wpływu zastosowanych powłok na jakość powierzchni zewnętrznej odlewów staliwnych.
    The increasing requirements of casting users regarding the dimensional accuracy and surface roughness of castings force the manufacturers, i.e. foundries, to use protective coatings on moulds and cores. Coatings are applied in order to protect the casting against the burn-on defects (mould material adhering to the casting surface), to reduce the surface roughness of castings, and to facilitate casting removal from the mould cavity. This paper presents the results of studies of multi-component coatings of the new generation made in accordance with the Polish Standard PN-H-11011:1997. Tests included the density of coatings, the content of dry matter, the sedimentation index and the amount of gas emitted by the coating. Melts were made to determine the impact of coating on the quality of the external surface of steel castings.
    Źródło:
    Prace Instytutu Odlewnictwa; 2018, 58, 4; 227-234
    1899-2439
    Pojawia się w:
    Prace Instytutu Odlewnictwa
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Reclaim Addition on the Mechanical and Technological Properties of Moulding Sands Based on Pro-Ecological Furfuryl Resin
    Autorzy:
    Kamińska, J.
    Puzio, S.
    Angrecki, M.
    Łoś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/354386.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    loose self-hardening sand
    pro-ecological furfuryl resin
    environmental protection
    strength tests
    gas-forming tendency
    Opis:
    Increasing demands are imposed on foundries to enforce the manufacture of castings characterized by tight dimensional tolerances, high surface finish and total absence of casting defects. To face these challenges, castings are increasingly made in loose self-hardening sands with furfuryl resin, commonly known as furan sands. In the group of self-hardening sands with synthetic resins, loose self-hardening sands with furfuryl resin enjoy the greatest popularity. The sand mixtures based on furan resins are usually subjected to mechanical reclamation. The consumption of binder and hardener and thus the cost of the sand depend on the quality of reclaim, and mainly on the dust removal degree.The planned tightening of the environmental protection regulations in the EU countries, including limiting the content of free furfuryl alcohol in resins and reducing the emission of furfuryl alcohol, formaldehyde and BTEX compounds at workplaces, necessitated the development of a new generation of eco-friendly furfuryl resins that have recently appeared on the market. The main aim of this article was to determine the effect of reclaim content on the sand parameters, such as bending strength, tensile strength, bench life, gas-forming tendency and loss on ignition. Tests were carried out with reclaim content in the sand mixture varying from 50 to 90%. The reclaim obtained by dry mechanical reclamation was supplied by one of the domestic foundries. The results showed that the highest mechanical properties were obtained in sands containing 60% of the reclaim.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1425-1429
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Phosphate Binder for Ablation Casting of AlSi7Mg Modified TiB Alloy
    Autorzy:
    Puzio, Sabina
    Kamińska, J.
    Major-Gabryś, K.
    Angrecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2126893.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ablation casting technology
    alumina
    phosphate binder
    self-hardening sand
    inorganic binder
    odlewanie ablacyjne
    tlenek glinu
    spoiwo fosforanowe
    piaski samoutwardzalne
    spoiwo nieorganiczne
    Opis:
    The possibilities of using an inorganic phosphate binder for the ablation casting technology are discussed in this paper. This kind of binder was selected for the process due to its inorganic character and water-solubility. Test castings were made in the sand mixture containing this binder. Each time during the pouring liquid alloy into the molds and solidification process of castings, the temperature in the mold was examined. Then the properties of the obtained castings were compared to the properties of the castings solidifying at ambient temperature in similar sand and metal molds. Post-process materials were also examined - quartz matrix and water. It has been demonstrated that ablation casting technology promotes refining of the microstructure, and thus upgrades the mechanical properties of castings (Rm was raised about approx. 20%). Properties of these castings are comparable to the castings poured in metal moulds. However, the post-process water does not meet the requirements of ecology, which significantly reduces the possibility of its cheap disposal.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 1; 62--68
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of the Type of Inorganic Binder on the Properties of Microwave-Hardened Moulding Sands for Ablation Casting Technology
    Autorzy:
    Puzio, S.
    Kamińska, J.
    Angrecki, M.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/353306.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative technologies
    ablation casting
    moulding sands
    microwave hardening
    environmentally friendly inorganic binders
    Opis:
    The aim of this study is to demonstrate the possibility of using moulding sands based on inorganic binders hardened in a microwave chamber in the technology of ablation casting of aluminium alloys. The essence of the ablation casting technology consists in this that a mould with a water-soluble binder is continuously washed with water immediately after being poured with liquid alloy until its complete erosion takes place. The application of an environmentally friendly inorganic binder improves the ecology of the whole process, while microwave hardening of moulding sands allows moulds to be made from the sand mixture containing only a small amount of binder. The studies described in this article included microwave-hardened sand mixtures containing the addition of selected inorganic binders available on the market. The strength of the sands with selected binders added in an amount of 1.0; 1.5 and 2.0 parts by mass was tested. As a next step, the sand mixtures with the strength optimal for ablation casting technology, i.e. about 1.5 MPa, were selected and tested for the gas forming tendency. In the four selected sand mixtures, changes occurring in the samples during heating were traced. Tests also included mould response to the destructive effect of ablation medium, which consisted in the measurement of time necessary for moulds to disintegrate while washed with water. Tests have shown the possibility of using environmentally friendly, microwave-hardened moulding sands in ablation casting of aluminium alloys.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 4; 1385-1390
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microwave-Hardened Moulding Sands with Hydrated Sodium Silicate for Modified Ablation Casting
    Autorzy:
    Puzio, S.
    Kamińska, J.
    Major-Gabryś, K.
    Angrecki, M.
    Hosadyna-Kondracka, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/379775.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    ablation casting
    moulding sands
    environmental protection
    hydrated sodium silicate
    microwave hardening
    odlewanie
    masy formierskie
    ochrona środowiska
    krzemian sodu
    hartowanie mikrofalowe
    Opis:
    The aim of this study is to demonstrate the possibility of using moulds made from the environmentally friendly sands with hydrated sodium silicate in modified ablation casting. The ablation casting technology is primarily intended for castings with diversified wall thickness and complex shapes made in sand moulds. The article presents the effect of binder content and hardening time on the bending strength Rgu of moulding sands with binders based on hydrated sodium silicate hardened by microwave technology. The aim of the research was to develop an optimal sand composition that would provide the strength necessary to make a mould capable of withstanding the modified ablation casting process. At the same time, the sand composition should guarantee the susceptibility of the mould to the destructive action of the ablation medium, which in this case is water. Tests have shown that microwave hardening provides satisfactory moulds’ strength properties even at a low binder content in the sand mixture.
    Źródło:
    Archives of Foundry Engineering; 2019, 2; 91-96
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Influence of the Modified Ablation Casting on Casts Properties Produced in Microwave Hardened Moulds with Hydrated Sodium Silicate Binder
    Autorzy:
    Major-Gabryś, K.
    Hosadyna-Kondracka, M.
    Puzio, S.
    Kamińska, J.
    Angrecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/352738.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sand
    ablation casting
    hydrated sodium silicate
    microwave hardening
    mechanical properties of casting
    Opis:
    The ablation casting technology consists in pouring castings in single-use moulds made from the mixture of sand and water-soluble binder. After pouring the mould with liquid metal the mould is destructed (washed out) using a stream of cooling medium, which in this case is water. The process takes place while the casting is still solidifying. The following paper focuses on testing the influence of the modified ablation casting of aluminum alloy on casts properties produced in moulds with hydrated sodium silicate binder. The authors showed that the best kind of moulding sands for Al alloy casting will be those hardened with physical factors – through dehydration. The analysis of literature data and own research have shown that the moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties for the modified ablation casting of Al alloys. In the paper the use of microwave hardened moulding sands has been proposed. The moulds were prepared in the matrix specially designed for this technology. Two castings from the AlSi7Mg alloy were made; one by traditional gravity casting and the other by gravity casting using ablation. The conducted casts tests showed that the casting made in modified ablation casting technology characterizes by higher mechanical properties than the casting made in traditional casting technology. In both experimental castings the directional solidification was observed, however in casting made by ablation casting, dimensions of dendrites in the structure at appropriate levels were smaller.
    Źródło:
    Archives of Metallurgy and Materials; 2020, 65, 1; 497-502
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Use of Floster S Technology in Modified Ablation Casting of Aluminum Alloys
    Autorzy:
    Kamińska, J.
    Angrecki, M.
    Puzio, S.
    Hosadyna-Kondracka, M.
    Major-Gabryś, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/379813.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    moulding sands
    ablation casting
    water glass
    floster S
    mechanical properties of casting
    surface quality
    piaski formierskie
    odlewanie ablacyjne
    szklanka wody
    właściwości mechaniczne odlewu
    jakość powierzchni
    Opis:
    Ablation casting is a technological process in which the increased cooling rate causes microstructure refinement, resulting in improved mechanical properties of the final product. This technology is particularly suitable for the manufacture of castings with intricate shapes and thin walls. Currently, the ablation casting process is not used in the Polish industry. This article presents the results of strength tests carried out on moulding sands based on hydrated sodium silicate hardened in the Floster S technology, intended for ablation casting of the AlSi7Mg (AK7) aluminium alloy. When testing the bending and tensile strengths of sands, parameters such as binder and hardener content were taken into account. The sand mixtures were tested after 24h hardening at room temperature. The next stage of the study describes the course of the ablation casting process, starting with the manufacture of foundry mould from the selected moulding mixture and ending in tests carried out on the ready casting to check the surface quality, structure and mechanical properties. The results were compared with the parallel results obtained on a casting gravity poured into the sand mould and solidifying in a traditional way at ambient temperature.
    Źródło:
    Archives of Foundry Engineering; 2019, 4; 81-86
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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