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Fabrication of Textured Nb4AlC3 Ceramic by Slip Casting in a Strong Magnetic Field and Spark Plasma Sintering

Authors

  • Chunfeng Hu,

    1. World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
    2. Fine Particle Processing Group, Nano Ceramics Center, NIMS, Tsukuba, Ibaraki 305-0047, Japan
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  • Yoshio Sakka,

    Corresponding author
    1. World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
    2. Fine Particle Processing Group, Nano Ceramics Center, NIMS, Tsukuba, Ibaraki 305-0047, Japan
    3. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
      †Author to whom correspondence should be addressed. e-mail: SAKKA.Yoshio@nims.go.jp
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    • *Member, The American Ceramic Society.

  • Hidehiko Tanaka,

    1. World Premier International Research Center (WPI) Initiative on Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0047, Japan
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  • Toshiyuki Nishimura,

    1. Fine Particle Processing Group, Nano Ceramics Center, NIMS, Tsukuba, Ibaraki 305-0047, Japan
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  • Salvatore Grasso

    1. Fine Particle Processing Group, Nano Ceramics Center, NIMS, Tsukuba, Ibaraki 305-0047, Japan
    2. Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan
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  • K. Bowman—contributing editor

  • This work was partially supported by Grand-in-Aid B (No. 20350099) for Scientific Research from the JSPS of Japan and also the World Premier International Research Center (WPI) Initiative, MEXT, Japan.

†Author to whom correspondence should be addressed. e-mail: SAKKA.Yoshio@nims.go.jp

Abstract

Textured Nb4AlC3 ceramic was successfully fabricated in a strong magnetic field followed by spark plasma sintering. The optimized suspension parameters for slip casting were determined to be 20 vol% Nb4AlC3 and 2 wt% polyethyleneimine dispersant of powder in deionized water. After texturing in a strong 12 T magnetic field followed by cold isostatic pressing, the relative green densities were 50.4% and 58.7%, respectively. A dense Nb4AlC3 sample was obtained by sintering at 1450°C under a pressure of 30 MPa in vacuum. X-ray diffraction analysis revealed that the preferred orientation of Nb4AlC3 grains parallel to the magnetic field direction was along the c-axis. The Lotgering orientation factors on the textured top surface (TTS) and textured side surface (TSS) were determined to be f(00l)=0.59 and f(hk0)=0.64, respectively. The layered texture microstructure contributed to laminar transgranular and intergranular fractures. The indentation response on the TTS showed isotropy and that on the TSS revealed anisotropy.

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