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    Wyświetlanie 1-9 z 9
    Tytuł:
    Attempts to Prepare Precision Composite Castings by Sintering Al2O3/AlSi11 Using Underpressure
    Autorzy:
    Szymański, P.
    Gawdzińska, K.
    Nagolska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/381239.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative foundry materials
    composites
    rapid prototyping
    innowacyjne technologie odlewnicze
    innowacyjne materiały odlewnicze
    kompozyty
    prototypy
    Opis:
    This article presents the preparation of composite casts made using the technology of precise casting by the method of melted models. The composite was reinforced with the ceramic sinter from Al2O3 particle shaped in a printed polystyrene female mould, which was fired together with precured ceramics. The resulting ceramic preform, after being saturated with paraffin and after the filling system is installed, was filled with liquid moulding sand and fired together with the mould. The reinforcement was saturated by means of the counter-pressure exerting action on the metal column, being a resultant of pressures inside and outside the chamber. The preliminary assessment showed no apparent defects in the shape of the cast. The casting was measured and the figures were compared with the dimensions of the matrix in which the reinforcing preform was made, the preform after firing and after saturation with paraffin. The results were presented in a table and dimensional deviations were determined. The composite casting was subjected to metallographic tests, which excluded any porous defects or damage to the reinforcement. It can therefore be said that, according to the predictions resulting from the previous calculations, the pressure values used allowed for complete filling of the reinforcement capillaries. The proposed method is therefore suitable for the preparation of precision composite castings with complex shapes.
    Źródło:
    Archives of Foundry Engineering; 2020, 20, 1; 49-54
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of Duration and Sequence of Vacuum Pressure Saturation in Infiltrated MMC Castings
    Autorzy:
    Gawdzińska, K.
    Nagolska, D.
    Szymański, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/379711.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    MMC
    saturation
    process parameters
    time of infiltration
    gypsum mold
    nasycenie
    parametry procesu
    infiltracja
    forma gipsowa
    Opis:
    The paper presents a detailed description of one of the newest methods of vacuum saturation of reinforcing preforms in gypsum molds. As an appropriate selection of the infiltration time is a crucial problem during realization of this process, aim of the analysis shown in the paper is to present methods of selection of subatmospheric pressure application time, a sequence of lowering and increasing pressure, as well as examining influence of structure of reinforcing preforms on efficiency of this process. To realize the aim, studies on infiltration of reinforcing preforms made of a corundum sinter of various granulation of sintered particles with a model alloy were conducted. The infiltration process analysis was carried out in two stages. The first stage consisted in investigation of influence of lengthening of sucking off air from the reinforcing preforms on efficiency of this process. In the second stage, an analysis of influence of a two-staged infiltration process on saturation of the studied materials was conducted. Because the studied preforms were of similar porosity, the obtained differences of the saturation level of particular preforms have shown, that the saturation process is influenced mostly by size of pores present in the reinforcement. Because of these differences, each reinforcement type requires individual selection of time and sequence of the saturation process. For reinforcements of higher pore diameter, it is sufficient to simply increase air sucking off time to improve the saturation, while for reinforcement of smaller pore diameter, it is a better solution to apply the two-staged process of sucking off air. Application of the proposed analysis method allows not only obtaining composite castings of higher quality, but also economical optimization of the whole process.
    Źródło:
    Archives of Foundry Engineering; 2018, 18, 1; 23-28
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Heat Treatment on Abrasive Wear Resistance of Silumin Matrix Composite Castings
    Autorzy:
    Gawdzińska, K.
    Bryll, K.
    Nagolska, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/352168.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal composite castings
    thermal treatment
    tribology
    aluminium alloy
    Opis:
    The authors attempted at examining the effect of heat treatment on abrasive wear resistance of metal composite castings. Metal matrix composites were made by infiltrating preforms created from unordered short fibers (graphite or silumin) with liquid aluminium alloy AlSi12(b). Thus prepared composites were subject to solution heat treatment at a temperature of 520°C for four hours, then aging at a temperature of 220°C for four hours. Abrasion resistance of the material was tested before and after thermal treatment.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 177-182
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Laser Cutting of MMC Castings – Preliminary Selection of Process Parameters
    Autorzy:
    Nagolska, D.
    Krajcarz, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/380575.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    composite casting
    laser cutting
    kompozyt metalowy
    odlew kompozytowy
    cięcie laserowe
    Opis:
    Composite materials gain more and more applications thanks to their specific properties and possibilities of shaping of products made out of them. One of the product forming technologies is cutting. Although most metal matrix composites are ready for use after volume shaping e.g. by casting, it is worth to define also possibilities of processing these materials also by this technology. This paper presents possibilities of cutting metal matrix composites and compares existing methods and their application range. The laser cutting of metal matrix composites reinforced with hard ceramic fiber was of particular interest in this work. Preliminary process parameters were determined and quality of obtained cut edges was compared with basic material of the aluminum matrix. This comparison proved that presence of reinforcement negatively affects the quality of the cut surface. However, the laser cutting process is efficient and it allows elastic shaping of metal matrix composites reinforced with hard ceramics.
    Źródło:
    Archives of Foundry Engineering; 2013, 13, 1 spec.; 125-130
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quality of the recovered metal matrix as a measure of the efficiency of the MMC recycling process
    Autorzy:
    Gawdzińska, K.
    Nagolska, D.
    Kochmańska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/359859.pdf
    Data publikacji:
    2013
    Wydawca:
    Akademia Morska w Szczecinie. Wydawnictwo AMSz
    Tematy:
    casting
    metal matrix composite (MMC)
    material recycling
    Opis:
    Quality of composite castings with infiltration reinforcement is dependent on many various factors. Technological parameters of the saturation process, manufacturing methods and quality of components are considered as the basic ones. During the recycling process of composite materials, the basic component that is being reclaimed is the metal matrix. The main aim of this paper is an evaluation of chemical composition and microstructure of the recovered metal matrix material. In the first stage, influence of preparation of liquid matrix metal is analyzed, with particular attention paid to its purity, degree of degassing and overheating, as well as an influence of the reinforcing material type on the final structure of composites obtained in the process of vacuum saturation. Specific of the structure and flaws occurring in such materials are of the particular concern here, as they are decisive for the methods of quality evaluation of these materials. Manufactured composite’s castings are subjected to the recycling process by a melting of the metal matrix on the second stage. The metal obtained in this way is analyzed regarding impurities occurring in its volume and, simultaneously, a comparison of evaluation methods of traditional metal alloys and metal composite castings is performed.
    Źródło:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie; 2013, 36 (108) z. 2; 37-44
    1733-8670
    2392-0378
    Pojawia się w:
    Zeszyty Naukowe Akademii Morskiej w Szczecinie
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analiza wpływu nasycenia kształtek zbrojenia na wybrane właściwości otrzymanych metalowych odlewów kompozytowych
    Analysis of impact of reinforcing preforms saturation on selected properties of obtained metal-matrix composite castings
    Autorzy:
    Nagolska, D.
    Gawdzińska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/380107.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    kompozyt metalowy
    zbrojenie nasycane
    właściwości mechaniczne
    metal matrix composite
    saturated reinforcement
    mechanical properties
    Opis:
    Jakość odlewów kompozytowych jest uwarunkowana wieloma czynnikami. W pracy przedstawiono wpływ wybranych parametrów nasycania kształtek zbrojących metalowe odlewy kompozytowe, takich jak temperatura i ciśnienie oraz wpływ struktury zbrojenia na stopień nasycenia a przez to porowatość badanych materiałów. Stwierdzono, iż w przypadku nasycania próżniowego największy wpływ na stopień nasycenia wytworzonych kompozytów ma porowatość zbrojących je kształtek. Dokonano również analizy wpływu stopnia nasycenia na wytrzymałość wybranych materiałów kompozytowych oraz porównano charakter ich niszczenia z charakterem niszczenia czystego stopu wykorzystywanego jako osnowa badanego kompozytu. Analiza objęła także określenie wpływu stopnia nasycenia kształtek zbrojących na uzysk metalu osnowy podczas procesu recyklingu kompozytów.
    Quality of composite castings is conditioned by many factors. This paper presents the impact of selected parameters of saturation of preforms reinforcing the metal-matrix composite castings, such as temperature, pressure and reinforcement structure, on degree of saturation and – consequently – porosity of examined materials. It was found that for the vacuum saturation, a saturation degree of produced composites is influenced mostly by porosity of the reinforcing preforms. An analysis of influence of the saturation degree on strength of selected composite materials was also conducted and character of their destruction was compared with character of destruction of a pure alloy used as a matrix of the examined composite. The analysis also included determination of the influence of reinforcement preforms saturation degree on yield of the matrix metal during the process of the composite recycling.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 143-148
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Classification of structure defects of metal matrix castings with saturated reinforcement
    Autorzy:
    Gawdzińska, K.
    Nagolska, D.
    Szweycer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380258.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    wada odlewu
    klasyfikacja
    composite castings defects
    classification
    Opis:
    Definition of a composite [1] describes an ideal composite material with perfect structure. In real composite materials, structure is usually imperfect - composites contain various types of defects [2, 3-5], especially as the casted composites are of concern. The reason for this is a specific structure of castings, related to course of the manufacturing process. In case of metal matrix composite castings, especially regarding these manufactured by saturation, there is no classification of these defects [2, 4]. Classification of defects in castings of classic materials (cast iron, cast steel, non-ferrous alloys) is insufficient and requires completion of specific defects of mentioned materials. This problem (noted during manufacturing metal matrix composite castings with saturated reinforcement in Institute of Basic Technical Sciences of Maritime University Szczecin) has become a reason of starting work aimed at creating such classification. As a result, this paper was prepared. It can contribute to improvement of quality of studied materials and, as a consequence, improve the environment protection level.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 3; 29-36
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Klasyfikacja wad struktury metalowych odlewów kompozytowych z nasycanym zbrojeniem
    Classification of structure defects of metal matrix castings with saturated reinforcement
    Autorzy:
    Gawdzińska, K.
    Nagolska, D.
    Szweycer, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/382377.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    odlew kompozytowy
    wada odlewu
    zbrojenie nasycane
    composite casting
    casting defect
    saturated reinforcement
    Opis:
    Definicja kompozytu [1] określa materiał kompozytowy idealny o doskonałej budowie. W rzeczywistych materiałach kompozytowych mamy na ogół do czynienia z budową niedoskonałą – materiały kompozytowe zawierają różnorodne wady [2, 3–5], szczególnie kiedy rozpatrujemy kompozyty wytwarzane przez odlewanie. Odlewy bowiem charakteryzują się specyficzną budową związaną z przebiegiem procesu ich wytwarzania. W przypadku odlewów z kompozytów metalowych, a szczególnie wytwarzanych przez nasycanie, brak jest klasyfikacji tych wad [2, 4]. Klasyfikacja wad odlewów z materiałów klasycznych (żeliwo, staliwo, stopy metali nieżelaznych) jest niewystarczająca i wymaga uzupełnienia o specyficzne wady wspomnianych tworzyw. Problem ten (zauważony podczas wytwarzania odlewów z metalowych kompozytów nasycanych w Instytucie Podstawowych Nauk Technicznych Akademii Morskiej w Szczecinie oraz w Instytucie Technologii Materiałów Politechniki Poznańskiej) stał się przyczyną podjęcia prac nad stworzeniem takiej klasyfikacji i w efekcie do powstania niniejszej propozycji, która przyczynić się może do poprawy jakości badanych materiałów, a co jest z tym związane, z ochroną środowiska.
    Źródło:
    Archives of Foundry Engineering; 2012, 12, 1s; 39-46
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of capillary hysteresis phenomenon for evaluation of recycling possibility of selected MMC
    Autorzy:
    Nagolska, D.
    Gawdzińska, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/382242.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal matrix composite
    saturated reinforcement
    reinforcement preform
    kompozyt metalowy
    zbrojenie nasycone
    kształtka
    Opis:
    Properties of composites made through saturation of ceramic reinforcement preforms with liquid metal are the cause of growing use of these materials. Taking increasing requirements regarding environment protection into consideration, already during design of such materials one should think of a way of their recycling at the end of life. The recycling of these materials is conducted by separation of components. Determining optimal superficial conditions of a recycling system: liquid metal matrix – reinforcement preform – medium enables automatic course of the recycling process, but does not guarantee high yield of metal. With identical superficial conditions of the recycling system and different structure of reinforcement preforms significant differences in metal yield can be obtained. Identification of a type of a capillary present in reinforcement preforms may allow to determine, already during stage of material design, which types of composites will undergo the recycling process better and for which types one has to accept decreased yield of matrix metal. This identification can be done on the basis of an analysis of results obtained during examination conducted with mercury porosimetry, comparing acquired hysteresis graphs with model graphs proposed by de Boer for adsorbent analysis. Considering the analysis of image of structure of examined reinforcement preforms makes the identification process easier and faster.
    Źródło:
    Archives of Foundry Engineering; 2011, 11, 3 spec.; 145-150
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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