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Ultralight Silicon Nitride Ceramic Foams from Foams Stabilized by Partially Hydrophobic Particles
Author(s) -
Zhang XiaoYan,
Huo WenLong,
Qi Fei,
Qu YaNan,
Xu Jie,
Gan Ke,
Ma Ning,
Yang JinLong
Publication year - 2016
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.14320
Subject(s) - materials science , ceramic , pulmonary surfactant , coalescence (physics) , suspension (topology) , composite material , silicon nitride , porosity , chemical engineering , particle (ecology) , layer (electronics) , oceanography , physics , mathematics , homotopy , astrobiology , pure mathematics , engineering , geology
Ultralight Si 3 N 4 ceramic foams have been successfully prepared through particle‐stabilized foams method, which is based on the adsorption of in situ hydrophobized Si 3 N 4 particles to the liquid/air interface of the foams. Here, we firstly used a long‐chain surfactant cetyltrimethylammonium chloride to render the Si 3 N 4 particles partially hydrophobic. By tailoring the surfactant concentration and pH values of the suspensions, the wet foams were stabilized to avoid coarsening and coalescence. SEM results show that the Si 3 N 4 ceramic foams possess single strut walls with elongated β‐Si 3 N 4 grains interlocking with each other, and their pores are uniform with an average pore size of 95 μm. The obtained ceramic foams maintain compressive strength of 1.34 ± 0.13 MP a with porosity of 92.0%, when the suspension contains 3 mmol/L surfactant at the pH of 11.0.