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    Wyświetlanie 1-6 z 6
    Tytuł:
    Manufacturing of Cast Metal Foams with Irregular Cell Structure
    Autorzy:
    Kroupová, I.
    Radkovský, F.
    Lichý, P.
    Bednářová, V.
    Powiązania:
    https://bibliotekanauki.pl/articles/382675.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metallic foam
    precursor
    casting
    irregular structure
    cell structure
    piana metalowa
    prekursor
    odlewanie
    struktura nieregularna
    struktura komórkowa
    Opis:
    Metallic foams are materials of which the research is still on-going, with the broad applicability in many different areas (e.g. automotive industry, building industry, medicine, etc.). These metallic materials have specific properties, such as large rigidity at low density, high thermal conductivity, capability to absorb energy, etc. The work is focused on the preparation of these materials using conventional casting technology (infiltration method), which ensures rapid and economically feasible method for production of shaped components. In the experimental part we studied conditions of casting of metallic foams with open pores and irregular cell structure made of ferrous and nonferrous alloys by use of various types of filler material (precursors).
    Źródło:
    Archives of Foundry Engineering; 2015, 15, 2; 55-58
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristics of the Geometric Structure of Metal Foams
    Charakterystyczne cechy struktury geometrycznej pian metalowych
    Autorzy:
    Gawdzińska, K.
    Grabian, J.
    Przetakiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/380836.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal foam
    geometric properties
    geometric structure
    piana metalowa
    właściwości geometryczne
    struktura geometryczna
    Opis:
    A description of material should include its characteristic properties. Metal foams, however, lack such descriptions. This author proposes a description of geometric structure of these materials and divides characteristics of the structure geometry into four groups: porosity, shape and size of pores, actual to maximum porosity ratio, specific surface area of bubbles and the homogeneity of the foam structure, divided, in turn, into the homogeneity of pore size, shape and distribution. This study is an open proposition of a description of metal foam geometric structure.
    Opis materiału powinien odbywać się na zasadzie opisu jego cech charakterystycznych. Niestety w przypadku metalowych pian kompozytowych opisu takiego nie stwierdzono. Postanowiono zatem przedstawić propozycję opisu struktury geometrycznej tych tworzyw dzieląc te cechy na: porowatość, kształt i wielkość porów, stosunek porowatości rzeczywistej do maksymalnej, powierzchnię właściwą pęcherzy oraz jednorodność budowy piany, gdzie wyodrębniono jednorodność wielkości, kształtu i rozmieszczenia porów. Praca ta ma charakter otwarty i jest propozycją opisu struktury geometrycznej pian metalowych.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 21-25
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investment Casting of AZ91 Magnesium Open-Cell Foams
    Autorzy:
    Kapłon, Honorata
    Dmitruk, Anna
    Naplocha, Krzysztof
    Powiązania:
    https://bibliotekanauki.pl/articles/27314112.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    innovative foundry technologies
    innovative materials
    metal foams
    investment casting
    magnesium alloy
    Innowacyjne technologie odlewnicze
    innowacyjne materiały
    pianki metalowe
    stopy magnezu
    Opis:
    The process of investment casting of AZ91 magnesium alloy open-cell porosity foams was analysed. A basic investment casting technique was modified to enable the manufacturing of magnesium foams of chosen porosities in a safe and effective way. Various casting parameters (mould temperature, metal pouring temperature, pressure during metal pouring and solidifying) were calculated and analysed to assure complete mould filling and to minimize surface reactions with mould material. The foams manufactured with this method have been tested for their mechanical strength and collapsing behaviour. The AZ91 foams acquired in this research turned out to have very high open porosity level (>80%) and performed with Young’s modulus of ~30 MPa on average. Their collapsing mechanism has turned out to be mostly brittle. Magnesium alloy foams of such morphology may find their application in fields requiring lightweight materials of high strength to density ratio or of high energy absorption properties, as well as in biomedical implants due to magnesium’s high biocompatibility and its mechanical properties similar to bone tissue.
    Źródło:
    Archives of Foundry Engineering; 2023, 23, 1; 11--16
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Casting routes for porous metals production
    Autorzy:
    Lichý, P.
    Bednarova, V.
    Elbel, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/382433.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    rozwój produktu
    pianka metalowa
    innovative foundry technologies
    innovative foundry material
    product development
    metal foams
    Opis:
    The last decade has seen growing interest in professional public about applications of porous metallic materials. Porous metals represent a new type of materials with low densities, large specific surface, and novel physical and mechanical properties, characterized by low density and large specific surface. They are very suitable for specific applications due to good combination of physical and mechanical properties such as high specific strength and high energy absorption capability. Since the discovery of metal foams have been developed many methods and techniques of production in liquid, solid and gas phases. Condition for the use of metal foams - advanced materials with unique usability features, are inexpensive ways to manage their production. Mastering of production of metallic foams with defined structure and properties using gravity casting into sand or metallic foundry moulds will contribute to an expansion of the assortment produced in foundries by completely new type of material, which has unique service properties thanks to its structure, and which fulfils the current demanding ecological requirements. The aim of research conducted at the department of metallurgy and foundry of VSB-Technical University Ostrava is to verify the possibilities of production of metallic foams by conventional foundry processes, to study the process conditions and physical and mechanical properties of metal foam produced. Two procedures are used to create porous metal structures: Infiltration of liquid metal into the mold cavity filled with precursors or preforms and two stage investment casting.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1; 71-74
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Study of Thermal Properties of Cast Metal-Ceramic Composite Foams
    Autorzy:
    Gawdzińska, K.
    Chybowski, L.
    Przetakiewicz, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/382873.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    casting material
    foundry technology
    metal composite foam
    ceramic composite foam
    thermal properties
    materiał odlewniczy
    technologia odlewnicza
    piana metalowa
    piana ceramiczna
    piana kompozytowa
    właściwości termiczne
    Opis:
    Owing to its properties, metallic foams can be used as insulation material. Thermal properties of cast metal-ceramic composite foams have applications in transport vehicles and can act as fire resistant and acoustic insulators of bulkheads. This paper presents basic thermal properties of cast and foamed aluminum, the values of thermal conductivity coefficient of selected gases used in foaming composites and thermal capabilities of composite foams (AlSi11/SiC). A certificate of non-combustibility test of cast aluminum-ceramic foam for marine applications was included inside the paper. The composite foam was prepared by the gas injection method, consisting in direct injection of gas into liquid metal. Foams with closed and open cells were examined. The foams were foaming with foaming gas consisting of nitrogen or air. This work is one of elements of researches connected with description of properties of composite foams. In author's other works acoustic properties of these materials will be presented.
    Źródło:
    Archives of Foundry Engineering; 2017, 17, 4; 47-50
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of the Cause and Consequences of Defects in Cast Metal-Ceramic Composite Foams
    Autorzy:
    Popielarski, P.
    Sika, R.
    Czarnecka-Komorowska, D.
    Szymański, P.
    Rogalewicz, M.
    Gawdzińska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/2079776.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    foams
    composites
    casting
    defects
    Opis:
    In this research, the quality of manufactured cast metal-ceramic foams (manufactured using blowing gas) was tested. The causes responsible for defect formation in the composite foams and their consequences were analyzed using the FMEA (Failure Mode and Effects Analysis) method, which is a useful tool for minimizing losses caused by low product quality. This method involves analytically determining correlations between the cause and consequences of potential product defects, and it takes into account the criticality factor (risk). The FMEA analysis showed that pore breaks were the most "critical defect" (with the highest number of effects on the product, the Risk Priority Number, affecting the quality of the composite foam). The second most critical defect was discontinuities in the foam frame structure. Destruction or damage to the foam structure (although very rare) deprived the composite foam of its primary function, which is to reinforce the product. The third most critical defect was non-uniform foam pore size.
    Źródło:
    Archives of Foundry Engineering; 2021, 21, 1; 81-88
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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