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    Wyświetlanie 1-6 z 6
    Tytuł:
    Centrifugal Infiltration of Porous Ceramic Preforms by the Liquid Al Alloy – Theoretical Background and Experimental Verification
    Autorzy:
    Dolata, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/958216.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium casts
    Al2O3 porous performs
    local reinforcement
    centrifugal infiltration
    Opis:
    The goal of this work is the description of phenomena occurring during centrifugal infiltration of porous ceramic materials by liquid Al alloy. In this method, the pressure required to infiltration of liquid metal into pores of ceramic is generated by centrifugal force. From the beginning it was assumed that the porous ceramic material will create reinforcement layer in specific area of the casting. The forces that influence on the liquid metal during mould centrifugation and heat exchange between ceramic preform and metal alloy within the area of the front of infiltration were considered in the analysis. The paper presents also selected experiment results.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 411-418
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Centrifugal Castings Locally Reinforced with Porous Al2O3 Preform
    Odlewy odśrodkowe lokalnie wzmocnione porowatą preformą Al2O3
    Autorzy:
    Dolata, A. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/352095.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium casts repair
    porous performs
    centrifugal infiltration
    structure
    odlewy aluminiowe
    preforma porowata
    infiltracja odśrodkowa
    struktura
    Opis:
    The main objective of presented researches were tests of infiltration of the porous ceramic preforms at the pressure in centrifugal casting process. Make an assumption that the porous preform will be create the local reinforcement layer in specific area of the casting. For investigations the alumina porous ceramic preforms were applied (Al2O3). The pressure to infiltrate molten aluminum alloy into ceramic preforms was generated by centrifugal force. The structure of composites was examined by light and electron microscope. The investigations of composites microstructure exhibited high degree of infiltration of spherical macropores in Al2O3 ceramic preforms by the molten aluminium alloy. On the basis of structural studies has been shown that centrifugal force is effective as a driving force for the infiltration of porous preforms.
    Głównym celem przedstawionych badań była próba infiltracji porowatych preform ceramicznych wspomagana ciśnieniem generowanym w procesie odlewania odśrodkowego. Założono, że porowata pretorma będzie tworzyć lokalne wzmocnienie w określonym obszarze odlewu. W badaniach wykorzystano preformy ceramiczne (Al2O3). Ciśnienie niezbędne do infiltracji ceramicznej preformy ciekłym stopem aluminium było generowane za pomocą siły odśrodkowej. Strukturę kompozytu badano z wykorzystaniem mikroskopii świetlnej i elektronowej. Badania mikrostruktury kompozytów wykazywały wysoki stopień infiltracji sferycznych makroporów preformy Al2O3 przez stop aluminium. Na podstawie badań strukturalnych wykazano, że siła odśrodkowa działa jako siła napędowa i wspomaga proces infiltracji porowatych preform.
    Źródło:
    Archives of Metallurgy and Materials; 2014, 59, 1; 345-348
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of Chemical Composition of the Matrix on AlSi/SiCp+Cp Composite Structure
    Autorzy:
    Dolata, A. J.
    Dyzia, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/380736.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    innovative foundry technologies
    innovative materials
    castings defects
    aluminium composite structure
    innowacyjne technologie odlewnicze
    materiały innowacyjne
    wady odlewów
    Opis:
    The casting processes using mechanical stirring of composite suspension are considered for the most economical methods for manufacturing of metal matrix composites in the application and industrial practice. The most common problems during the composite suspensions production include: weak wetting between liquid Al alloy and ceramic particles and gassing of composite mixtures resulting with introducing the particles into aluminium alloy and long-term stirring process. The agglomerates and clusters of particles created among others as an effect of gas blisters absorption on the surface of ceramics causes discontinuity of composite structure and thereby they reduce properties of final products. The porosity has disadvantageous effect on mechanical properties of products, it reduces the corrosion and wear resistance, particularly under technically dry friction conditions. Therefore, to produced the casts composite possessed optimal properties, it is necessary their minimal porosity. To obtaining a good high-quality castings, the proper selection of components, particularly the chemical composition of the Al matrix and the kind of reinforcement are necessary. In this paper, the effect of chemical composition of the matrix on AlSi/SiCp+Cp composite structure were presented.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 1 spec.; 135-138
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of SiC and GR Reinforcement Particles on the Structure and Functional Properties of Composite Casting E43 MMC Reinforced with SiC Particles
    Autorzy:
    Boczkal, S.
    Dolata, A. J.
    Nowak, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/351537.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    aluminium hybrid composite
    microstructure
    wear tests
    Opis:
    The aim of the study was to describe the structure of composites based on the AlSi7Mg2Sr0.03 alloy matrix reinforced with SiC particles added in an amount of 10% and with a mixture of SiC and GR particles added in a total amount of 20%. Studies of the composite structure, were carried out by scanning electron microscopy (SEM). Based on the results of chemical analysis in microregions, an increased content of elements such as Mg, O and Si and of the precipitates was observed at the interface. In many places in the examined sample, GR particles formed partly disintegrated conglomerates with well developed boundaries. The effect of the content of particles of the reinforcing phase on the functional properties of the composite was investigated during studies of abrasion. The lowest mass loss of 5,33mg was obtained for the AlSi7Mg2Sr0.03 alloy reinforced with 10% SiC particles.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 1; 399-404
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of the Sr and Mg Alloying Additions on the Bonding Between Matrix and Reinforcing Particles in the AlSi7Mg/SiC-Cg Hybrid Composite
    Autorzy:
    Dolata, A. J.
    Dyzia, M.
    Boczkal, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/356551.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid aluminium composites
    Mg and Sr modification
    solidification
    structure
    permanent mould casting
    Opis:
    The aim of the work was to perform adequate selection of the phase composition of the composite designated for permanent - mould casting air compressor pistons. The hybrid composites based on AlSi7Mg matrix alloy reinforced with mixture of silicon carbide (SiC) and glassy carbon (Cg) particles were fabricated by the stir casting method. It has been shown that the proper selection of chemical composition of matrix alloy and its modification by used magnesium and strontium additions gives possibility to obtain both the advantageous casting properties of composite suspensions as well as good bonding between particles reinforcements and matrix.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 651-656
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cast Hybrid Composites Designated for Air Compressor Pistons
    Autorzy:
    Dolata, A. J.
    Dyzia, M.
    Jaworska, L.
    Putyra, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/356742.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid aluminium composites
    glassy carbon
    graphite particles
    mould casting
    machining
    Opis:
    The main purpose of the investigations was to develop the phase composition of the composite assuming that the component selection criterion will be the formability of piston work surfaces during the machining. Wear resistance under the friction conditions was assumed as the additional parameter for the assessment of composite material. In the study were used AlSi7Mg/SiC+Cg and AlSi7Mg/SiC+GR hybrid composites prepared by the stir casting method.
    Źródło:
    Archives of Metallurgy and Materials; 2016, 61, 2A; 705-708
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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