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Thermal stability of interfaces in Ti-6Al-4V reinforced by SiC Sigma fibres

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Abstract

Interfacial reactions in Ti-6Al-4V/SiC Sigma fibres (coated with carbon and TiB2) were studied at different temperatures (600, 700 and 1000 °C). Interface microstructure was investigated by scanning electron microscopy and Auger electron spectroscopy. A simulation of the chemical phenomena occurring at the interfaces was carried out using powders of pure titanium, carbon and TiB2; the reaction products were identified by X-ray diffraction. The double coating of Sigma fibres is effective in delaying detrimental reactions with the matrix. At the interfaces matrix/TiB2 and TiB2/C, the TiB and TiCx phases form, respectively. The protective coating of fibres shows a lifetime greater than 1000 and 750 h at 600 and 700 °C, respectively.

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Authors and Affiliations

  1. Dipartimento di Scienza dei Materiali e Ingegneria Chimica, Politecnico di Torino, C. so Duca degli Abruzzi 24, I 10129, Torino, Italy

    C. Badini & M. Ferraris

  2. Divisione Scienza dei Materiali, Loc. Pantè di Povo, IRST, I 38100, Trento, Italy

    F. Marchetti

Authors
  1. C. Badini
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  2. M. Ferraris
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  3. F. Marchetti
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Badini, C., Ferraris, M. & Marchetti, F. Thermal stability of interfaces in Ti-6Al-4V reinforced by SiC Sigma fibres. Journal of Materials Science 29, 4840–4846 (1994). https://doi.org/10.1007/BF00356531

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