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Influence of heat treatment and fiber orientation on the damage threshold and the fracture behavior of Nextel fiber-reinforced Mullite-SiOC matrix composites analysed by acoustic emission monitoring

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Abstract

In the present study, we elucidate the influence of oxidative heat exposures at 1000 and 1200 °C on an alumina fiber-reinforced polymer-derived ceramic matrix composite containing small residual amounts of carbon. Therefore, we investigated the flexural performance and fracture toughness of on- (0°/90°) and off-axis (45°) reinforced samples. Acoustic emission was used to monitor the internal damage and its progression during loading. At 1000 °C, a moderate reduction of strength and fracture toughness is found while after exposure to 1200 °C a dramatic decrease down to 50 % is observed. For all composites, a reduction of the damaged volume was found after heat treatments indicating a decrease of crack deflection. However, especially at 1000 °C, composites reinforced in 0°/90° direction seemed to be more affected, as no detrimental effect on the mechanical performance was found for the 45° composites. Remarkably, the oxidation-induced silica formation increases the absolute and relative damage thresholds of all composites. A Griffith-like linear relationship between strength and toughness is found. These findings are pivotal for designing and engineering next generation CMCs toward long-term applications.

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Acknowledgments

The authors would like to thank T. C. Schumacher and P. Pringle for the valuable discussions.

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Authors and Affiliations

  1. Advanced Ceramics, University of Bremen, Am Biologischen Garten 2, 28359, Bremen, Germany

    E. Volkmann, A. Dentel, K. Tushtev & K. Rezwan

  2. EADS Deutschland GmbH/Airbus Group Innovations, Munich, Germany

    C. Wilhelmi

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  1. E. Volkmann
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  2. A. Dentel
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  3. K. Tushtev
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  4. C. Wilhelmi
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Corresponding author

Correspondence to K. Tushtev.

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10853_2014_8501_MOESM1_ESM.tif

Figure A1: Diffractograms for N610 0/90 for the different material states. The arrow indicates the cristobalite reflex. All measurements were done for equally prepared samples (polished), with the same device and the measurement time was kept constant. (TIFF 92 kb)

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Volkmann, E., Dentel, A., Tushtev, K. et al. Influence of heat treatment and fiber orientation on the damage threshold and the fracture behavior of Nextel fiber-reinforced Mullite-SiOC matrix composites analysed by acoustic emission monitoring. J Mater Sci 49, 7890–7899 (2014). https://doi.org/10.1007/s10853-014-8501-z

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