Abstract
Porous Si3N4 ceramics with open, closed pores and nest-like structures were prepared by direct foaming method, and the stability of bubbles and the microstructures of sintered Si3N4 foam ceramics were investigated. The bubbles produced by short-chain amphiphiles have higher stability as compared with that produced by long-chain surfactants. Si3N4 ceramic foams using short-chain amphiphiles are particle-stabilized one, porous Si3N4 ceramics with open and closed pores can be easily prepared with this method, and the nest-like microstructure in Si3N4 foam ceramics is achieved at high gas-pressure sintering conditions. The decrease of flexural strength due to the increase of porosity can be weakened by decreasing pore size.
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Acknowledgments
Our research work presented in this paper is supported by the National High Technology Research and Development Program of China (Grant No 2010AA03A408), and Beijing Sci-tech Plan of China (Grant No 20101092117). The authors are grateful for these grants.
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Yu, J., Yang, J., Li, H. et al. Pore structure control of Si3N4 ceramics based on particle-stabilized foams. J Porous Mater 19, 883–888 (2012). https://doi.org/10.1007/s10934-011-9545-y
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DOI: https://doi.org/10.1007/s10934-011-9545-y