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Zirconia-mullite ceramics made from composite particles coated with amorphous phase: I. Effect of zirconia addition

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Abstract

Mullite-based ceramics added with 0–20 vol % stabilized zirconia have been prepared by alumina/zirconia particles coated with an amorphous silica layer. All samples can be densified through the viscous flow of the amorphous silica layer in the typical temperature range of 1100–1310 °C. For the ZrO2-free mullite ceramics, the viscous densification kinetics is inhibited by increasing the content of the alumina inclusion particles and by crystallization of the amorphous silica layer. However, for the zirconia-mullite ceramics, the addition of the zirconia inclusion particles accelerates the viscous densifcation kinetics. Mullitization kinetics is also enhanced by the addition of zirconia. As the sintering temeperature is high, a porous, duplex microstructure is observed in samples with or without zirconia. Zirconia addition enhances the development of this microstructure. As the sintering temperature and/or zirconia content is increased, ZrO2 particles tend to coarsen, resulting in a decreased tetragonal to monoclinic ratio. Fracture toughness KlC increases with the zirconia content. Mullite-20 vol % ZrO2 composite sintered at 1600 °C has a KlC of 3.8 MPa · m1/2.

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Authors and Affiliations

  1. Department of Materials Engineering, Tatung Institute of Technology, 10451, Taipei, Taiwan, Republic of China

    Jiin-Jyh Shyu & Yuan-Chieh Chen

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  1. Jiin-Jyh Shyu
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  2. Yuan-Chieh Chen
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Shyu, JJ., Chen, YC. Zirconia-mullite ceramics made from composite particles coated with amorphous phase: I. Effect of zirconia addition. Journal of Materials Research 10, 63–70 (1995). https://doi.org/10.1557/JMR.1995.0063

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  • DOI: https://doi.org/10.1557/JMR.1995.0063

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