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Effect of heating rate on grain morphology of in situ reinforced reaction bonded aluminium niobate-based composites

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Abstract

Reaction-bonded aluminium niobate-based composites with tailored microstructures were fabricated through controlled nucleation and growth of AlNbO4 needle-like grains. Using heating rates of 0.5 to < 160 °C min−1, the effects of heat-up period on microstructure development, and the volume content, grain-size distribution as well as aspect ratio of AlNbO4 grains has been investigated. The morphology of the final microstructure is principally determined by the grain growth during heat-up. Equiaxed to elongated grains were obtained by using different heating rates and thermal ageing at 1320 °C in air. SEM observations revealed that increasing the heating rate promotes the development of large and homogeneously distributed needle-like grains. The results presented show that tailoring of final AlNbO4 microstructures become possible by the control of heating rate.

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Authors and Affiliations

  1. Advanced Ceramics Group,, Technische Universität Hamburg-Harburg,, 21071, Hamburg,, Germany

    D. E. García, R. Janssen & N. Claussen

  2. National Industrial Research Institute of Nagoya,, Hirate-cho 1-1,, Kita Ku, Nagoya 462, Japan

    M. E. Brito

Authors
  1. D. E. García
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  2. R. Janssen
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  3. N. Claussen
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  4. M. E. Brito
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García, D.E., Janssen, R., Claussen, N. et al. Effect of heating rate on grain morphology of in situ reinforced reaction bonded aluminium niobate-based composites. Journal of Materials Science 34, 769–772 (1999). https://doi.org/10.1023/A:1004572913358

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