Title: The effect of nano-Si₃N₄ on properties of silicon nitride ceramics

Authors: Yingge Dong, Jinlong Yang

Addresses: College of Materials Science and Engineering, North University of China, Taiyuan 030051, China. ' State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

Abstract: Silicon nitride ceramics were fabricated using submicron Si3N4 powder and nano-Si₃N₄, adding Al₂O₃ and Y₂O₃ by isostatic pressing and SSN. In the paper, the dispersion of nano-Si3N4 powder, the effect of different nano-Si3N4 concentrations on Si₃N₄ ceramic mechanical properties, application performances and nano-Si3N4 dispersion are discussed. The results demonstrated that the dispersion effect of ethanol was better than water as solvent when PEG was the dispersant agent and the time was 40 min by a supersonic instrument. Flexural strength, hardness and fracture toughness of the specimens were the highest when the content of nano-Si₃N₄ was 3% by weight.

Keywords: nano-Si₃N₄; silicon nitride ceramic; properties.

DOI: 10.1504/IJMPT.2010.031420

International Journal of Materials and Product Technology, 2010 Vol.37 No.3/4, pp.217 - 227

Published online: 03 Feb 2010 *

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