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Microstructural characterisation of syntactic foams

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Abstract

Three types of hollow microspheres with different average diameters (100–150 μm) and two aluminium alloys as matrix material were used to produce metal matrix syntactic foams (MMSFs) by pressure infiltration. The phases, which formed at matrix-filler interface, were investigated by X-ray diffraction (XRD) and energy dispersive spectrometry (EDS). The investigation showed that in syntactic foams, with the Al99.5 matrix, an exchange reaction took place between the matrix and the amorphous components of ceramic hollow microspheres. The reaction resulted in significant formation of alumina and Si precipitates. Because of this diffusion reaction, the hollow microspheres’ walls were degraded. In the case of the AlSi12 matrix the reaction was suppressed by the considerable Si content of the matrix. Therefore, the wall of the hollow microspheres remained unharmed and no real interface layer was found.

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Acknowledgements

Special thanks to Professor J.T. Blucher for his kind support and to I. Sajo for XRD measurements. The Metal Matrix Composites Laboratory is supported by Grant # GVOP 3.2.1-2004-04-0145/3.0. The investigations were supported by The Hungarian Research Fund, NKTH-OTKA K69122. Thanks to R. Toth and C. H. Erbsloh Hungaria Speciality and Industrial Minerals Ltd. for providing E-spheres.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Budapest University of Technology and Economics, Goldmann Gy. tér 3, Budapest, 1111, Hungary

    Imre N. Orbulov & Arpad Nemeth

  2. Research Group for Metals Technology of the Hungarian Academy of Sciences, Goldmann Gy. tér 3, Budapest, 1111, Hungary

    Janos Dobranszky

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  1. Imre N. Orbulov
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  2. Janos Dobranszky
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  3. Arpad Nemeth
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Correspondence to Imre N. Orbulov.

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Orbulov, I.N., Dobranszky, J. & Nemeth, A. Microstructural characterisation of syntactic foams. J Mater Sci 44, 4013–4019 (2009). https://doi.org/10.1007/s10853-009-3552-2

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  • DOI: https://doi.org/10.1007/s10853-009-3552-2

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