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Effects of surfactant and particle size on the microstructure and strength of Si3N4 foams with high porosity
Author(s) -
Du Zhongpei,
Yao Dongxu,
Xia Yongfeng,
Zuo Kaihui,
Yin Jinwei,
Liang Hanqin,
Zeng YuPing
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13689
Subject(s) - materials science , porosity , particle size , microstructure , composite material , surface tension , ceramic , slurry , viscosity , pulmonary surfactant , specific surface area , particle (ecology) , compressive strength , chemical engineering , organic chemistry , chemistry , physics , oceanography , quantum mechanics , engineering , geology , catalysis
The highly porous Si 3 N 4 ceramic foams were prepared by direct foaming with mixed surfactants. The surface tension and viscosity of slurries were tailored by different carbon chain length of surfactants and different mean Si 3 N 4 particle size to achieve the pore size controlling. The nearly linear relationship between the pore size and the ratio of surface tension to viscosity was observed, which indicates that the pore size could be precisely tailored by the slurry properties. Si 3 N 4 ceramic foams with porosity of nearly 94%, mean pore size of 110–230 µm, and compressive strength of 1.24–3.51 MPa were obtained.