Preparation and Properties of Spark Plasma Sintered AlN/BN Nano-Composites

Abstract:

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Nano-sized turbostritic-BN (t-BN) was fabricated through chemical process using boric acid and urea in this work. By the same method, the AlN powders coated with nano-BN were prepared too. The results of X-ray diffraction (XRD) and transmission electron microscope (TEM) revealed that nano-sized t-BN was synthesized at about 600°C in nitrogen gas and it surrounded the surface of AlN particles. High-density AlN/BN nano-composites were fabricated spark plasma sintering (SPS). Microstructure and properties of AlN/BN nano-composites (5~30vol% BN) were investigated. The h-BN flake particles were homogenously dispersed at AlN grain boundaries and within grains in the AlN/BN composites. A little nano-BN additions significantly improved the bending strength of the nano-composites. However, the bending strength was decreased with the BN content increasing. The thermal conductivity of AlN/BN nano-composites was investigated too.

Info:

Periodical:

Edited by:

Katsutoshi Komeya, Yohtaro Matsuo and Takashi Goto

Pages:

197-200

DOI:

10.4028/www.scientific.net/KEM.352.197

Citation:

M. J. Li et al., "Preparation and Properties of Spark Plasma Sintered AlN/BN Nano-Composites", Key Engineering Materials, Vol. 352, pp. 197-200, 2007

Online since:

August 2007

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Price:

$35.00

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