Pore structure control of Si3N4 ceramics based on particle-stabilized foams |
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Authors: | Juanli Yu Jinlong Yang Hexin Li Yong Huang |
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Affiliation: | 1. State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
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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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