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Preparation and characterization of multilayered ZrO2 coatings on silicon carbide fibers for SiC/SiC composites

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Abstract

We have studied the surface morphology, phase composition, and oxidation resistance of multilayered tetragonal zirconia coatings produced on silicon carbide fibers by a sol-gel process and measured the tensile strength of individual fibers as a function of the number of layers in the coating. SiC-fiber-reinforced silicon carbide minicomposites have been prepared through pyrolysis of an organosilicon polymer, and their fracture surfaces have been examined. Using microindentation, we have determined the critical fiber-matrix debonding stress. The results demonstrate that the ZrO2 coating on the fibers has the form of uniform, weakly bonded layers. The presence of a multilayered ZrO2 interphase alters the fracture behavior of the SiC/SiC composites. The fiber debond stress in the composites markedly decreases with an increase in the number of layers in the interphase.

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Authors and Affiliations

  1. Institute of Solid-State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, ul. Kutateladze 18, Novosibirsk, 630128, Russia

    A. V. Utkin, A. A. Matvienko & N. I. Baklanova

  2. Joint Institute of Geology, Geophysics, and Mineralogy, Siberian Branch, Russian Academy of Sciences, pr. Akademika Koptyuga 3, Novosibirsk, 630090, Russia

    A. T. Titov

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  1. A. V. Utkin
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  2. A. A. Matvienko
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  3. A. T. Titov
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  4. N. I. Baklanova
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Correspondence to A. V. Utkin.

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Original Russian Text © A.V. Utkin, A.A. Matvienko, A.T. Titov, N.I. Baklanova, 2011, published in Neorganicheskie Materialy, 2011, Vol. 47, No. 10, pp. 1176–1181.

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Utkin, A.V., Matvienko, A.A., Titov, A.T. et al. Preparation and characterization of multilayered ZrO2 coatings on silicon carbide fibers for SiC/SiC composites. Inorg Mater 47, 1066–1071 (2011). https://doi.org/10.1134/S0020168511090238

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  • DOI: https://doi.org/10.1134/S0020168511090238

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