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  • Spontaneous reactive infiltration of porous ceramic preforms with Al-Mg and Mg in the presence of both magnesium and nitrogen - new experimental evidence
    Kevorkijan, Varužan ; Kosmač, Tomaž, 1948-2022 ; Krnel, Kristoffer
    Conditions for the initiation of spontaneous reactive infiltration were studied on quartz sand, boron-carbide, and silicon-nitride powder beds, as well as sintered amphorous silica preforms, ... infiltrated with Al-5Mg and Mg in a nitrogen atmosphere. The experimental conditions (presence of both magnesium and nitogen) selected to favor the formation of Mg3N2 and AIN phases. However, these products were not detected in energy dispersive spectroscopy (EDS) spectra, particularly not as the main product phase at the infiltration interface. Apart from significant microstructural differences mostly caused by the different extent of chemical reactivity between the cereamic skeleton and the molten metal, the similar EDS spectra observed at the matrix-reinforcement interfaces suggest that spontaneous infiltration in all the applied preforms is most probabluy induced by the same or similar spontaneous infiltration mechanism. The mechanism proposed in this work is based on on the formation of Al2O3-MgO-SiO2 containing phases, which completely or partly coat the ceramic particles and enhance wetting.
    Vir: Materials and manufacturing processes. - ISSN 1042-6914 (Vol. 17, no. 3, 2002, str. 307-322)
    Vrsta gradiva - članek, sestavni del
    Leto - 2002
    Jezik - angleški
    COBISS.SI-ID - 7250710

vir: Materials and manufacturing processes. - ISSN 1042-6914 (Vol. 17, no. 3, 2002, str. 307-322)

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