Microstructure control of Ce-TZP/Ba ferrite composites using an amorphous precursor of the second phase

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  • KOJIMA Takashi
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • OORI Shinya
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • WATANABE Takuya
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • SHIMADA Yuya
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • NORO Syunpei
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • UEKAWA Naofumi
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University
  • KAKEGAWA Kazuyuki
    Department of Applied Chemistry and Biotechnology, Graduate School of Engineering, Chiba University

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Composites consisting of Ce-TZP matrix and in situ-grown particles of barium ferrite (BaM) were prepared using various starting materials. For the starting material for the second phase, an amorphous precursor powder of BaM was prepared by coprecipitation and calcination. Uniform hematite particles were also prepared using liquid-phase synthesis under hydrothermal conditions. The Ce-TZP/20 wt % BaM composites were prepared by sintering the mixed powders of Ce-TZP, barium carbonate, hematite, and amorphous precursor of BaM. The aspect ratio of the in situ-grown BaM particles increased concomitantly with an increase in the mixing ratio of the amorphous precursor powder. The exaggerated grain growth of the BaM in the Ce-TZP matrix was efficiently suppressed by the addition of a small amount of barium carbonate and hematite to the amorphous precursor of BaM.

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