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Porous Si 3 N 4 Fabricated by Phase Separation Method Using Benzoic Acid as Pore‐Forming Agent
Author(s) -
Yue Jianshe,
Dong Binchao,
Wang Hongjie
Publication year - 2011
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2011.04611.x
Subject(s) - porosity , materials science , benzoic acid , flexural strength , slurry , sublimation (psychology) , green body , composite material , fracture toughness , chemical engineering , ceramic , mineralogy , chemistry , organic chemistry , psychology , engineering , psychotherapist
Porous Si 3 N 4 ceramics with interconnected pores were fabricated by the phase separation method using benzoic acid ( BA ) as a pore‐forming agent. The green bodies were prepared at room temperature under vacuum and pore‐forming agent was quickly removed by sublimation below 200°C. The resulting porous green body exhibits uniform distribution of rod‐like pores in the matrix. The porosity can be controlled by adjusting the BA content in Si 3 N 4 slurry. The flexural strength and fracture toughness of the porous Si 3 N 4 samples are in the range of 85–126 MPa and 1.08–1.7 MPa·m 1/2 with the porosity range of 57%–65.8%.