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Journal of Nanomaterials
Volume 2011, Article ID 246847, 5 pages
Research Article

BN Nanoparticles/Si3N4 Wave-Transparent Composites with High Strength and Low Dielectric Constant

Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education and Shandong University, Jinan 250061, China

Received 9 November 2010; Revised 20 January 2011; Accepted 7 March 2011

Academic Editor: Wei He

Copyright © 2011 Dongliang Zhao et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Si3N4 wave-transparent composites with different volume content of BN nanoparticles (BNnp/Si3N4) were prepared by gas pressure sintering at 1800°C in N2 atmosphere. The effects of BN nanoparticles on the dielectric and mechanical properties of BNnp/Si3N4 composites were investigated. The results showed that the addition of the BN nanoparticles improved the dielectric properties of BNnp/Si3N4 composites effectively and decreased the mechanical properties. When the volume content of BN nanoparticles was 10%, the dielectric constant and dielectric loss tangent were 4.31 and 0.006, respectively, and the bending strength and fracture toughness still reached 198.9 MPa and 3.36 MPa·m1/2. The high mechanical properties of BNnp/Si3N4 composites with 10% BN nanoparticles were attributed to homogeneously dispersed BN nanoparticles which were embedded in the pores formed by the rod-like β-Si3N4.