Influence of Nano-Silica on Microstructure and Mechanical Properties of SiO₂/BN Ceramics

Abstract:

In this paper, nano-silica particles were incorporated to a fused silica-boron nitride dual phase ceramics originally using micrometer sized particles as starting powders. Effects of nano-silica content on density, sintering behavior, mechanical properties and microstructure of the dual phase ceramics were investigated. It was found that with the addition of nano-silica particles, the density and mechanical properties of the dual phase ceramics increased. Flexural strength and fracture toughness of them attained to 51.4MPa and 0.8MPa·m1/2, respectively. The increased density and spatial network structure of fused silica attribute to the improvement of the mechanical properties of the dual phase ceramics.

• Periodical: Key Engineering Materials (Volumes 353-358)
• Pages: 1529-1532
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.353-358.1529
• Online since: September 2007
• Authors: Li Zhong Zhou, De Chang Jia
• Keywords: Boron Nitride, Fused Silica, Gelcasting, Mechanical Property, Microstructure, Nanosilica

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