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Tailoring the microstructure of high porosity Si 3 N 4 foams by direct foaming with mixed surfactants
Author(s) -
Du Zhongpei,
Yao Dongxu,
Xia Yongfeng,
Zuo Kaihui,
Yin Jinwei,
Liang Hanqing,
Zeng YuPing
Publication year - 2019
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/jace.16599
Subject(s) - materials science , microstructure , porosity , slurry , ceramic , compressive strength , pulmonary surfactant , composite material , foaming agent , chemical engineering , mixing (physics) , physics , quantum mechanics , engineering
The mixed surfactants were successfully applied to fabricate the highly porous Si 3 N 4 ceramic foams by the direct foaming method. The oppositely charged surfactants mixed in slurries could combined into catanionic surfactant by the electrostatic attraction and facilitate the formation of ultra‐stable foams. The microstructure of the Si 3 N 4 ceramic foams, including pore structure, mean pore size, pore size distribution and porosity were tailored by varying the mixing ratio of surfactant, mixed surfactants concentration and solid content of the initial slurries. Si 3 N 4 ceramic foams with porosity of 92%‐97%, mean pore size of 140‐240 µm and compressive strength of 0.85‐5.38 MPa were obtained by adjusting mixed surfactants between 0.1 and 0.4 wt% and solid content between 22 and 30 vol%. The compressive strength of Si 3 N 4 ceramic foams in current work was much higher than most reported results.