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    Wyświetlanie 1-10 z 10
    Tytuł:
    The Influence of Various Matrixes on the Strength Properties of Moulding Sands with Thermally Hardened Hydrated Sodium Silicate for the Ablation Casting Process
    Autorzy:
    Major-Gabryś, Katarzyna
    Puzio, Sabina
    Bryłka, Agata
    Kamińska, Jadwiga
    Powiązania:
    https://bibliotekanauki.pl/articles/2056023.pdf
    Data publikacji:
    2021
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    innovative foundry technologies and materials
    moulding sand
    ablation casting
    water glass
    thermal curing
    innowacyjne technologie
    materiały odlewnicze
    piasek formierski
    odlewanie ablacyjne
    szkło wodne
    utwardzanie termiczne
    Opis:
    The essence of ablation casting technology consists in pouring castings into single-use moulds made from the mixture of sand and a water-soluble binder. After pouring the mould with liquid metal yet while the casting is still solidifying, the mould destruction (washing out, erosion) takes place using a stream of cooling medium, which in this case is water. This paper focuses on the selection of moulding sands with hydrated sodium silicate for moulds used in ablation casting. The research is based on the use of water glass 145 and 150 as binders. As part of the research, loose moulding mixtures based on two silica sands from different sand mines with different content of binders were prepared. The review of literature data and the results of own studies have shown that moulding sand with hydrated sodium silicate hardened by dehydration is characterized by sufficient strength properties to be used in the ablation casting process. Our own research also confirmed the possibility of using these sand mixtures in terms of both casting surface quality and sand reclamation. The results presented in this paper prove that both sand grains and types of binder tested may be used as components in moulding sands devoted to ablation casting.
    Źródło:
    Journal of Casting & Materials Engineering; 2021, 5, 2; 31--35
    2543-9901
    Pojawia się w:
    Journal of Casting & Materials Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Zirconium as an Alloying Additive on the Microstructure and Properties of AlSi9Mg Alloy Cast in Sand Moulds
    Autorzy:
    Kamińska, Jadwiga
    Angrecki, Michał
    Dudek, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/2203930.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    silumins
    hardening
    alloying additives
    microstructure
    strength tests
    siluminy
    utwardzanie
    dodatki stopowe
    badania mikrostruktury
    testy wytrzymałościowe
    Opis:
    The aim of the study was to select the optimal content of zirconium introduced as an alloying additive to obtain the best strength properties of Al-Si alloy. A technically important disadvantage is the tendency of silumins to form a coarse-grained structure that adversely affects the mechanical properties of castings. To improve the structure, modification processes and alloying additives are used, both of which can effectively refine the structure and thus increase the mechanical properties. According to the Hall-Petch relationship, the finer is the structure, the higher are the mechanical properties of the alloy. The proposed addition of zirconium as an alloying element has a beneficial effect on the structure and properties of silumins, inhibiting the grain growth. The starting material was an aluminium-silicon casting alloy designated as EN AC-AlSi9Mg (AK9). Zirconium (Zr) was added to the alloy in an amount of 0.1%, 0.2%, 0.3%, 0.4% and 0.5% by weight. From the modified alloy, after verification of the chemical composition, samples were cast into sand moulds based on a phenolic resin. The first step in the research was testing the casting properties of alloys with the addition of Zr (castability, density, porosity). In the next step, the effect of zirconium addition on the structure and mechanical properties of castings was determined.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 4; 5--13
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of the Addition of Bentonite Clay to Traditional Sand Mixtures on the Surface Quality of Iron Castings
    Autorzy:
    Kamińska, Jadwiga
    Puzio, Sabina
    Angrecki, Michał
    Stachowicz, Mateusz
    Powiązania:
    https://bibliotekanauki.pl/articles/123084.pdf
    Data publikacji:
    2020
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    bentonite
    bentonite clay
    traditional sand mixtures
    casting surface quality
    Opis:
    Successful casting demands that during pouring of the foundry mould with molten metal the mould cavity suffers no deformation. This, in turn, demands the use of binding materials that can give the base sand adequate strength. The main bonding materials are clay binders. The foundry industry uses minerals rich in clay, such as kaolinite, halloysite, hydromica, montmorillonite, polygorskite, vermiculite and allophane. Due to their binding capacity, montmorillonites are the most interesting minerals of all the plastic clay rocks. The basic clay rock containing montmorillonite, used as a common binding material for traditional foundry sand mixtures, is bentonite. The domestic demand for raw bentonite materials is almost entirely satisfied by imports from Slovakia, Turkey, Italy, Germany and the Czech Republic, in order of import size. In Poland, the bentonite deposits occur in very small quantities. The exploitation of bentonites is carried out only in the Krzeniów deposit, where they constitute a mineral accompanying basalt. Much more common are bentonite clays containing in addition to smectites also a large amount of other clay minerals. The article presents the results of studies of the physico-chemical and mechanical properties of moulding sand mixtures containing pure bentonite, pure clay or hybrid bentonites which are a bentonite-clay mixture. Melting was also carried out to determine the effect of the type of binder on the surface quality of iron castings.
    Źródło:
    Journal of Ecological Engineering; 2020, 21, 1; 160-167
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Effect of Reclaim Primary Quality on Moulding Sand Parameters and Quality of Ductile Iron Casting Surface Layer
    Autorzy:
    Kamińska, Jadwiga
    Angrecki, M.
    Puzio, S.
    Stachowicz, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2134210.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry industry
    furfuryl resin
    reclaim
    self-hardening moulding sand
    surface quality
    ductile iron
    przemysł odlewniczy
    żywica furfurylowa
    masa formierska
    masa samoutwardzalna
    jakość powierzchni
    odlew z żeliwa sferoidalnego
    Opis:
    The aim of the research was to determine the effect of the primary quality of reclaim from dry mechanical reclamation on the strength properties and service life of moulding sands based on this reclaim. Another aim was to establish the effect of the quality of reclaim, sulphur content - in particular, on the surface quality and thickness of the deformed surface layer in ductile iron castings. The research has revealed differences in the strength parameters and service life (mouldability) of sands based on the tested reclaims, depending on the type of the furfuryl resin used, including resins whose synthesis was done as part of the Żywfur project. Examinations of the structure of the surface layer of test castings poured in moulds made of loose self-hardening sands containing the addition of reclaim have confirmed the occurrence of degenerated spheroidal graphite in this part of the casting. It should be noted here that when massive castings with a long solidification time are made, the graphite degeneration effect can be more visible and the layer with the changed structure can increase in thickness. The research has clearly shown that it is necessary to control the parameters of the reclaim, including sulphur content which is transferred from the hardener and accumulates on the grains. This phenomenon has a negative impact not only on the sand strength and technological properties but also on the surface layer of castings.
    Źródło:
    Archives of Foundry Engineering; 2022, 22, 2; 83--88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Research on Selected Types of Lustrous Carbon Carriers After the High - Temperature Pyrolysis
    Autorzy:
    Kamińska, Jadwiga
    Stachowicz, M.
    Kubecki, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1837781.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foundry
    green moulding sand
    lustrous carbon
    pyrolysis
    core shooting
    odlewnia
    piasek formierski
    węgiel błyszczący
    piroliza
    Opis:
    For research purposes and to demonstrate the differences between materials obtained from the carbonaceous additives to classic green moulding sands, five lustrous carbon carriers available on the market were selected. The following carbonaceous additives were tested: two coal dusts (CD1 and CD2), two hydrocarbon resins (HR1 and HR2) and amorphous graphite (AG1). The studies of products and material effects resulting from the high-temperature pyrolysis of lustrous carbon carriers were focused on determining the tendency to gas evolution, including harmful compounds from the BTEX group (benzene, toluene, ethylbenzene and xylene). Moreover, the content of lustrous carbon (LC), the content of volatile matter and loss on ignition (LOI) of the carbonaceous additives were tested. The solid products formed during high-temperature pyrolysis were used for the quantitative and qualitative evaluation of elemental composition after the exposure to temperatures of 875oC in a protective atmosphere and 950oC in an oxidizing atmosphere. The conducted studies have indicated the necessity to examine the additives to classic green moulding sands, which is of particular importance for the processing, rebonding and storage of waste sand. The studies have also revealed some differences in the quantitative and qualitative composition of elements introduced to classic moulding sands together with the carbonaceous additives that are lustrous carbon carriers. It was also considered necessary to conduct a research on lustrous carbon carriers for their proper and environmentally friendly use in the widely propagated technology of classic green sand system.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 56-62
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Prezydenci i radcy Sądu Obwodowego w Rzeszowie (1855–1891)
    The presidents and legal counsels of the District Court for Rzeszów (1855–1891)
    Autorzy:
    Kotliński, Tomasz J.
    Hoff, Jadwiga
    Kamińska-Kwak, Jolanta
    Powiązania:
    https://bibliotekanauki.pl/articles/2232955.pdf
    Data publikacji:
    2022
    Wydawca:
    Archiwum Państwowe w Rzeszowie
    Tematy:
    sądownictwo
    sędziowie
    Galicja
    administration of justice
    judges
    Galicia
    Opis:
    Opracowanie poświęcone jest osobom, które w zakreślonej cezurze lat 1855– 1891 pełniły urząd prezydentów oraz radców orzekających w Sądzie Obwodowym w Rzeszowie. Na wstępie, dla lepszego zrozumienia tematu, przedstawiono w zarysie organizację sądownictwa w Galicji, jaka wprowadzona została w 1855 r. oraz rozbudowaną strukturę stanowisk i rang urzędników sędziowskich. Praca obejmuje jedynie tych sędziów – radców, którzy zawodowo związani byli z Rzeszowem. Na podstawie dostępnych informacji przedstawiona została nie tylko ścieżka kariery zawodowej omawianych kolejno sędziów, ale również ich zaangażowanie w sprawy lokalnych społeczności na gruncie instytucji autonomicznych, organizacji społecznych, charytatywnych i stronnictw politycznych.
    The following study is dedicated to individuals, who held the positions of presidents and ruling legal counsels of the District Court for Rzeszów at the time period of 1855–1891. At the beginning, to provide a better understanding of the topic, a general overview of the judiciary system of Galicia introduced in 1855 was presented,with expanded structure of positions and ranks of court officials. The study focuses only on the judges – legal counsels who were professionally bound with Rzeszów. Based on the available information, the study not only introduces the professional career paths of the sequentially presented judges, but also their engagement in local communities’ matters considering autonomous institutions, social organizations, charities and political parties.
    Źródło:
    Prace Historyczno-Archiwalne; 2022, Tom XXXIV; 35-48
    1231-3335
    Pojawia się w:
    Prace Historyczno-Archiwalne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary Tests of Innovative Eco-Friendly Furfuryl Resins and Foundry Sand Mixtures Based on These Resins
    Autorzy:
    Kamińska, Jadwiga
    Puzio, Sabina
    Angrecki, Michał
    Stachowicz, Mateusz
    Łoś, Anna
    Powiązania:
    https://bibliotekanauki.pl/articles/123922.pdf
    Data publikacji:
    2019
    Wydawca:
    Polskie Towarzystwo Inżynierii Ekologicznej
    Tematy:
    loose self-hardening sand
    furfuryl resin
    environmental protection
    mechanical tests
    casting surface quality
    Opis:
    The foundry industry in Poland and EU member states is growing steadily. The alloys based on ferrous metals (cast steel and cast iron) largely contribute to this upward trend. Currently, foundries are facing the problem of increasing requirements, which enforce the production of castings characterized by high dimensional accuracy and surface smoothness with parallel elimination of casting defects. Castings are mostly made in moulding sand mixtures, which are also subject to more and more stringent requirements to meet the above-mentioned casting acceptance conditions. Additionally, moulding sands should ensure adequate mould stiffness to avoid the risk of dimensional deformations during the pouring of liquid metal to this mould and casting solidification. For these reasons, the production of this type of castings has been dominated by loose self-hardening sands with furfuryl resin, commonly called furan sands. In the group of self-hardening sands with synthetic resins, loose self-hardening sands with furfuryl resin enjoy the greatest popularity. What accounts for this fact is the high level of the reclamability of these sands, the possibility of obtaining castings with high dimensional accuracy, the ability to make intricate moulds and cores, the binding process taking place at ambient temperature, and low content of binder. Unfortunately, this technology also has some disadvantages, which include short lifetime of the sand mixture, harmful gases emitted from the sand, and currently also high cost of the sand mixture. The anticipated tightening of the environmental protection regulations in the EU countries, including limiting the content of free furfuryl alcohol in resins (<25% by mass) and reducing the emission of furfuryl alcohol, formaldehyde and BTEX compounds at workplaces, necessitated the development of a new generation of furfuryl resins friendly to the environment. The article compares the results of testing the strength properties of foundry moulding sands using two types of resins, i.e. the resin of a new generation synthesized by Grupa Azoty JRCh and a commercial resin used in the foundry industry. Additionally, derivatographic studies of the above mentioned sand mixtures were conducted, and the loss on ignition and the amount of gases emitted by the sand mixture were determined. Melting was also carried out to study the impact of the resin used on the surface quality of iron castings.
    Źródło:
    Journal of Ecological Engineering; 2019, 20, 9; 285-292
    2299-8993
    Pojawia się w:
    Journal of Ecological Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Gimnazjum w Brzeżanach w latach 1806–1918. Zarys dziejów
    Historical outline of the middle school in Brzeżany in the years 1806-1918
    Autorzy:
    Ochenduszko, Tadeusz
    Hoff, Jadwiga
    Kamińska-Kwak, Jolanta
    Pudłocki, Tomasz
    Powiązania:
    https://bibliotekanauki.pl/articles/2232952.pdf
    Data publikacji:
    2022
    Wydawca:
    Archiwum Państwowe w Rzeszowie
    Tematy:
    Galicja
    Brzeżany
    gimnazjum
    nauczyciele
    uczniowie
    XIX–XX wiek
    Galicia
    middle school
    teachers
    students
    19th and 20th century
    Opis:
    Pierwotną siedzibą szkoły był Zbaraż. W 1789 r. cesarz Józef II Habsburg założył w mieście tym pięcioletnie gimnazjum. Była to jedna z sześciu tego typu szkół średnich w Galicji. W 1805 r. cesarz Franciszek I podjął decyzję, aby zakład przenieść do Brzeżan – miasta będącego siedzibą cyrkułu. W 1819 r., w wyniku reformy oświaty, liczbę klas zwiększono do sześciu. Cztery niższe nazwano gramatykalnymi, a dwie wyższe – humanioralnymi. Sprawami pedagogicznymi kierował prefekt, a strategiczne decyzje podejmował dyrektor, który był jednocześnie starostą (Kreishauptmann) cyrkułu. Po Wiośnie Ludów w 1848 r. Kreishauptmann utracił zwierzchnictwo nad gimnazjum, a prefekt podniesiony został do rangi dyrektora i przejął odpowiedzialność za całokształt działalności szkoły. W wyniku kolejnej reformy władze planowały zdegradować gimnazjum do czteroletniego, jednak dzięki staraniom lokalnej społeczności udało się temu zapobiec i uzyskać zgodę na powiększenie szkoły do ośmiu klas. Nastąpiło to w latach 1863/64–1864/65. W maju i czerwcu 1865 r. dla absolwentów klasy ósmej odbyła się pierwsza w Brzeżanach matura, zwana egzaminem dojrzałości. Bardziej korzystne warunki dla rozwoju szkoły nastały po uzyskaniu przez Galicję autonomii. Liczba zespołów klasowych wzrosła z 9 w roku 1868/69 do 23 w latach poprzedzających I wojnę światową, a liczba uczniów z ponad 300 do ponad 700. Od roku szkolnego 1906/07 zaczęto tworzyć klasy utrakwistyczne (dwujęzyczne), w których dla części przedmiotów językiem wykładowym był polski, a dla pozostałych – ukraiński. W roku szkolnym 1914/15 gimnazjum nie funkcjonowało z powodu okupacji dużej części Galicji przez wojska rosyjskie. W latach 1915/16–1917/18 znajdowało się albo w strefie przyfrontowej, albo pod okupacją i do lutego 1918 r. nie było w nim warunków do wznowienia systematycznej pracy.
    The erstwhile location of the school was Zbaraż. In 1789, Holy Roman Emperor Joseph II founded a five-year middle school in Zbaraż. It was one of six such schools in Galicia. In 1805 Emperor Franz Joseph I made a decision to move the institution to Brzeżany – a town which was the capital of the district. After school reforms of 1819, the number of classes was increased to six. The four lower classes were grammatical, with the two higher ones being poetics and rhetoric. A prefect was responsible for the teaching matters, and the strategic decisions were made by a director, who was at the same time a leader of the district (ger. Kreishauptmannem). After the Springtime of Nations in 1848, Kreishauptmann lost his authority over the middle school, and a prefect was raised to the rank of director and took the sole responsibility for running the school. As a result of another reform, the government was trying to reduce the curriculum time in middle school to four years. However, thanks to the efforts of the local community, this was avoided and the middle school curriculum was increased to eight classes. It happened in the years 1863–1864 and 1864–1865. The first matura exam for the Brzeżany eighth grade students was conducted in May and June 1865. After Galicia became autonomous, the school had more room for expansion. The number of students over the years increased from 300 to over 700, and so from 9 groups being taught in the year 1868–1869, it increased to 23 groups being taught in the years preceding World War I. Bilingual classes were being created from the school year 1906–1907, where some subjects were taught in Polish and the rest in Ukrainian. In the school year of 1914–1915, the middle school was closed due to Russian occupation of a large part of Galicia. In the years 1915–1916 and 1917–1918, the middle school was either considered to be at the front or under occupation, and due to these conditions it could not be reopened until February 1918.
    Źródło:
    Prace Historyczno-Archiwalne; 2022, Tom XXXIV; 7-34
    1231-3335
    Pojawia się w:
    Prace Historyczno-Archiwalne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Computer modelling of the ablation casting process and prediction of the strength properties of AC-42000 castings
    Autorzy:
    Małysza, Marcin
    Puzio, Sabina
    Major-Gabryś, Katarzyna
    Głowacki, Mirosław
    Wilk-Kołodziejczyk, Dorota
    Kamińska, Jadwiga
    Powiązania:
    https://bibliotekanauki.pl/articles/29520071.pdf
    Data publikacji:
    2022
    Wydawca:
    Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
    Tematy:
    casting
    simulations
    ablation
    gravity sand casting
    gravity die casting
    mechanical properties
    Opis:
    The demand for castings with superior properties has compelled the development and optimization of manufacturing technologies. By further developing already known techniques, we are able to contribute to the introduction of new research possibilities. The article presents the methodology of conducting simulation tests of the gravity casting process into sand moulds with the use of ablation. The ablation technique consists in spraying water through evenly spaced nozzles onto a mould into which the liquid casting alloy has been poured. The conducted research focuses on an alloy from the group of Al-Si alloys. In order to compare the effects of different techniques, additional tests were carried out for gravity casting into sand and metal die moulds. At the same time, virtual experiments were conducted to develop a simulation methodology for ablation casting technology, taking into account mould degradation. Additionally, the possibility of predicting the final mechanical properties of various manufacturing technologies was tested. Destructive tests were carried out to determine the mechanical properties in the cast samples, as well as microstructure tests and secondary dendrite spacing. The results of the mechanical tests are compared with the predicted simulation properties.
    Źródło:
    Computer Methods in Materials Science; 2022, 22, 2; 79-88
    2720-4081
    2720-3948
    Pojawia się w:
    Computer Methods in Materials Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-10 z 10

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