Texture Development in Si_3N_4 Ceramics by Magnetic Field Alignment during Slip Casting(Sintering and Microstructure,<Special Issue>Guest Editors Dedicated to Prof. Gunter Petzow: Modern Trends in Advanced Ceramics)
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The effects of α-Si_3N_4 powder, β-Si_3N_4 seed particles and sintering conditions on the texture development in Si_3N_4 ceramics, which were prepared by slip casting in a strong field of 12T, followed by pressureless sintering. In the case of the replacement of the fine powder (UBE SN-E10) with the coarse powder (UBE SN-E05), no alignment of α-Si_3N_4 crystals was observed, but the alignment of β-Si_3N_4 crystals was observed in the green body, despite the low amount of β-Si_3N_4 (〜1wt%). This suggests that the grain alignment during slip casting is predominant by the grain alignment of the minor β-Si_3N_4 phase present in the α-Si_3N_4 raw powder, which is featured by the rod-like shape and less-agglomerated form. The alignment of both α-Si_3N_4 and β-Si_3N_4 crystals occurs by the c-axis of the crystals perpendicular to the magnetic field. The addition of 5wt% β-Si_3N_4 particles leads to the enhanced grain orientation of the β-Si_3N_4 particles in the green body for both raw α-Si_3N_4 powders. It is shown that the crystallographic orientation of β-Si_3N_4 is enhanced by the substitution of SN-E10 for SN-E05 powder, the addition of β-Si_3N_4 particles and prolonged sintering, but the phase transformation of α to β may play a dominant role in the texture development in Si_3N_4 during sintering, compared to the grain growth after the complete phase transformation. Owing to the crystallographic orientation, the samples exhibited anisotropic shrinkage behavior during sintering and the anisotropy becomes strong with enhanced grain orientation. The present study suggests that the control of the alignment of β-Si_3N_4 is crucial for the texture development in Si_3N_4 by the magnetic field alignment.
- 社団法人日本セラミックス協会の論文
- 2006-11-01
著者
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UCHIKOSHI Tetsuo
Nano Ceramics Center, National Institute for Materials Science
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SUZUKI Tohru
Nano Ceramics Center, National Institute for Materials Science
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SAKKA Yoshio
Nano Ceramics Center, National Institute for Materials Science
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Zhu Xinwen
Fine Particle Processing Group Nano Ceramics Center National Institute For Materials Science
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Zhu Xinwen
Fine Particle Processing Group Nano Ceramics Center National Institute For Materials Science (nims)
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Suzuki Tohru
Fine Particle Processing Group Nano Ceramics Center National Institute For Materials Science
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Sakka Yoshio
National Inst. Materials Sci. Ibaraki Jpn
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Sakka Yoshio
World Premier International Research Center Initiative (wpi Initiative) On Materials Nanoarchitronic
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Nishimura Toshiyuki
Non-Oxide Ceramics Group, Nano-Ceramics Center, National Institute for Materials Science
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Sakka Yoshio
Fine Particle Processing Group National Institute For Materials Science
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Nishimura Toshiyuki
Non-oxide Ceramics Group Nano-ceramics Center National Inst. For Materials Sci.
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Nishimura Toshiyuki
Nano Ceramics Center National Inst. For Materials Sci.
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Nishimura Toshiyuki
Non-oxide Ceramics Group Nano Ceramics Center National Institute For Materials Science
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Nishimura Toshiyuki
National Institute For Materials Science
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Nishimura Toshiyuki
National Institute For Materials Science Nano Ceramics Center
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Nishimura Toshiyuki
Advanced Materials Laboratory National Institute For Materials Science
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Uchikoshi Tetsuo
National Inst. Of Material Sci.
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Uchikoshi Tetsuo
Nano Ceramics Center National Institute For Materials Science
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Uchikoshi Tetsuo
Nano Ceramics Center National Institute For Materials Sciences (nims)
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Uchikoshi Tetsuo
National Institute For Materials Science
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UCHIKOSHI Tetsuo
Fine Particle Processing Group, Nano Ceramics Center, National Institute for Materials Science
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Sakka Yoshio
Nano Ceramics Center National Inst. For Materials Sci. (nims)
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Sakka Yoshio
Fine Particle Processing Group Materials Engineering Laboratory National Institute For Materials Sci
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Suzuki Tohru
Nano Ceramics Center National Institute For Materials Science
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Suzuki Tohru
Fine Particle Processing Group Materials Engineering Laboratory National Institute For Materials Sci
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Suzuki Tohru
National Research Institute For Metals
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