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Bonding effect of liquid magnesium with open-celled carbon foam in interpenetrating phase composite

Journal of Magnesium and Alloys 2021年第1期9卷 156-165页

作者： Marcin Godzierz Anita Olszowka-Myalska Natalia Sobczak Rafal Nowak Patryk Wrze'sniowski Silesian University of Technology Faculty of Materials EngineeringKrasi´nskiego 8 street40-019 KatowicePoland Institute of Metallurgy and Materials Science Polish Academy of SciencesRaymonta 25 streetKrakówPoland Łukasiewicz Foundry Research Institute Zakopia´nska 73 street30-418 KrakówPoland

The issue of bonding formation in liquid metal/open-celled carbon foam(C_(of))systems was examined,taking into account the practical aspects of the synthesis of a new type of Mg-C metal material *** problem is complex due to the strong oxidation and intense evaporation of liquid magnesium,as well as the 3D geometry of the carbon component,where metal transport occurred through the foam cells’*** experiments performed at 700℃ in ceramic crucibles showed that spontaneous carbon foam infiltration by liquid metal is impossible under the applied conditions,either in an air atmosphere coupled with flux protection or under argon *** tests performed in a UHV chamber filled with static pure Ar by a sessile drop method,coupled with non-contact heating and capillary purification at a test temperature of 700℃ directly in the UHV chamber,showed non-wetting behavior of the Mg/C_(of)couple with a correspondingly high contact angle of about 135°.The graphite capillary was then moved down,the liquid drop being slightly pressed into the foam,but these changes did not induce effective foam *** the short contact time for the sessile drop test under an argon atmosphere,SEM+WDS analysis of the solidified Mg/C_(of)couple revealed the formation of an MgO interlayer at the interface,with a thickness of approx.1μ*** experimentally demonstrated presence of oxygen in the carbon foam sample,both before and after its contact with magnesium,points to oxide-type bonding being established between Mg and C_(of).This observation is in a good agreement with previous reports on the interface characterization of magnesium matrix composites reinforced with glassy carbon materials and carbon fibers by stir casting and pressure *** on the findings of this study,a general structural scheme of the bonding process between carbon foam and liquid magnesium,as an important stage in the syntheses of Mg-C composites,was proposed.

关键词： Magnesium matrix composite open-celled carbon foam Interpenetrating phase composites Wetting Interface

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