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Microstructure and mechanical properties of mullite/ZrO2 composites

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Abstract

The sintering, microstructure and toughness of mullite/ZrO2 composites with increasing amount of ZrO2 (0 to 20 vol %) have been studied. A very active premullite powder has been used as matrix. TheK IC values increase from 2.1 to 3.2 MN m−3/2 as the volume fraction of zirconia increases from 0 to 0.2. The realtive fraction of tetragonal zirconia decreases as the volume fraction of ZrO2 increases to reach ∼0.1 in the sample with 0.2 volume fraction of ZrO2. The presence of ZrO2 enhances the sintering rate and end-point density of the composites. Finally, the increasing toughness in mullite/ZrO2 composites has been explained by a grain boundary strengthening mechanism produced by a metastable solid solution (∼0.5 wt %) of ZrO2 in mullite.

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Authors and Affiliations

  1. Instituto de Ceramica y Vidrio, Arganda del Rey, Madrid, Spain

    J. S. Moya & M. I. Osendi

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  1. J. S. Moya
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  2. M. I. Osendi
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Moya, J.S., Osendi, M.I. Microstructure and mechanical properties of mullite/ZrO2 composites. J Mater Sci 19, 2909–2914 (1984). https://doi.org/10.1007/BF01026966

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  • DOI: https://doi.org/10.1007/BF01026966

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