Effect of Alignment of Large Grains on the Thermal Conductivity of Self-Reinforced β-Silicon Nitride

Naoto HIROSAKI; Motohide ANDO; Yusuke OKAMOTO; Fumio MUNAKATA; Yoshio AKIMUNE; Kiyoshi HIRAO; Koji WATARI; Manuel E. BRITO; Motohiro TORIYAMA; Shuzo KANZAKI

doi:10.2109/jcersj.104.1171

Naoto HIROSAKI, Motohide ANDO, Yusuke OKAMOTO, Fumio MUNAKATA, Yoshio AKIMUNE, Kiyoshi HIRAO, Koji WATARI, Manuel E. BRITO, Motohiro TORIYAMA, Shuzo KANZAKI

Author information

Naoto HIROSAKI
Materials Research Laboratory, Nissan Motor Co., Ltd.
Motohide ANDO
Materials Research Laboratory, Nissan Motor Co., Ltd.
Yusuke OKAMOTO
Materials Research Laboratory, Nissan Motor Co., Ltd.
Fumio MUNAKATA
Materials Research Laboratory, Nissan Motor Co., Ltd.
Yoshio AKIMUNE
Materials Research Laboratory, Nissan Motor Co., Ltd.
Kiyoshi HIRAO
National Industrial Research Institute of Nagoya
Koji WATARI
National Industrial Research Institute of Nagoya
Manuel E. BRITO
National Industrial Research Institute of Nagoya
Motohiro TORIYAMA
National Industrial Research Institute of Nagoya
Shuzo KANZAKI
National Industrial Research Institute of Nagoya

Keywords: β-Si₃N₄, Thermal conductivity, Microstructure, Grain growth, Tape-casting, Orientation

JOURNAL FREE ACCESS

1996 Volume 104 Issue 1216 Pages 1171-1173

DOI https://doi.org/10.2109/jcersj.104.1171

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Abstract

Thermal conductivity of sintered silicon nitride has been improved by the alignment of large β-Si₃N₄ grains. Beta-Si₃N₄ containing 0.5mol% Y₂O₃ and 0.5mol% Nd₂O₃ was seeded with rodlike β-Si₃N₄ grains and tape-cast to align the seed grains. In-situ composite microstructure of the aligned large grains in smaller matrix grains was developed by the grain growth of seed grains during gas-pressure sintering at 2200°C for 4h. Room-temperature thermal conductivity was anisotropic: 137W·m^-1·K^-1 in the direction of tape-casting, 97W·m^-1·K^-1 of seet width, and 72W·m^-1·K^-1 in the direction of seet stack. The thermal conductivity in the direction parallel to the tape-casting direction was high because of the aligned large grains.

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