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SiC filament/titanium matrix composites regarded as model composites

Part 1 Filament microanalysis and strength characterization

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Abstract

Two types of large diameter SiC CVD filaments have been investigated on both chemical and mechanical standpoints: a 100μm filament with a tungsten core (from SNPE) and three 140μm filaments with carbon cores and surface coatings (from AVCO). On the basis of microprobe (X-ray, Auger and Raman), X-ray diffraction and SEM analyses, it appears that the former is made of a single homogeneous stoichiometric SiC deposit while the latter are mainly made of two concentric shells (the inner being a SiC+C mixture and the outer almost pure SiC). All the C-core filaments had received a surface coating (either pure pyrocarbon or SiC+C mixture) presumably to protect the brittle SiC deposit against abrasion due to handling in opposition to the W-core filament which seems to have no surface coating at all. The W-core filament, although smaller in diameter, is weaker than the C-core filaments (average UTS of 3 and 4 GPa respectively for a 40 mm gauge length). However, its strength distribution is much narrower (Weibull moduli of 7–8 and 2–5 respectively). Failures of most filaments appear to have a multimodal character.

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Authors and Affiliations

  1. Laboratoire de Chimie du Solide du CNRS, Université de Bordeaux-I, 351, Cours de la Libération, 33405, Talence, France

    P. Martineau, M. Lahaye, R. Pailler & R. Naslain

  2. Laboratoire de Spectroscopie Infrarouge associé au CNRS, LA 124, Université de Bordeaux-I, 351, Cours de la Libération, 33405, Talence, France

    M. Couzi & F. Cruege

Authors
  1. P. Martineau
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  2. M. Lahaye
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  3. R. Pailler
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  4. R. Naslain
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  5. M. Couzi
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  6. F. Cruege
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Martineau, P., Lahaye, M., Pailler, R. et al. SiC filament/titanium matrix composites regarded as model composites. J Mater Sci 19, 2731–2748 (1984). https://doi.org/10.1007/BF00550831

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  • DOI: https://doi.org/10.1007/BF00550831

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