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  • Cost-effective aluminium foaming by CaC▫$O_3$▫ particulates
    Kevorkijan, Varužan
    In this work, the viability of CaCO3 powder as a cost-effective alternative to TiH2 foaming agent was investigated. Closed cell aluminium foam samples were prepared starting from solid, foamable ... precursors synthesized by (i) powder metallurgy and (ii) the melt route. Precursors obtained by the melt route were machined and additionally cold isostatically pressed in order to improve their density. In all cases, the resulting precursors consisted of an aluminium matrix containing various fractions (3, 5, 7 and 12 wt.%) of uniformly dispersed CaCO3 powders of various average particle size (d50= 38, 72 and 120 ìm). Precursors were foamed by inserting them into a cylindrical stainless steel mould and placing them in a pre-heated batch furnace at 750 °C for 10 min. The quality of the foamable precursors was evaluated by determining their initial density and the foaming efficiency (the relative density of the foam obtained, ñ, calculated by dividing the apparent density of the foam, ñF, by the density of aluminium, ñAl). In addition, the quality of the foams obtained was characterised by their density, microstructure (the average pore size) and mechanical properties (uniaxial room temperature compression stress-strain curve, compressive strength and energy absorption after a 30% strain). The experimental findings confirmed that aluminium foams synthesized with CaCO3 powder as a blowing agent can be prepared by both powder metallurgy and the melt route, as well as showing that the density, microstructure, compression strength and energy absorption capacity are quite comparable with the corresponding counterparts foamed by TiH2.
    Vir: Aluminium. - ISSN 0002-6689 (Vol. 86, 12, Dec. 2010, str. 59-66)
    Vrsta gradiva - članek, sestavni del
    Leto - 2010
    Jezik - angleški
    COBISS.SI-ID - 14642454

vir: Aluminium. - ISSN 0002-6689 (Vol. 86, 12, Dec. 2010, str. 59-66)
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