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Highly Porous Silicon Nitride Foam Prepared Using a Route Similar to the Making of Aerated Food
Author(s) -
Yin Liuyan,
Zhou Xingui,
Yu Jinshan,
Wang Honglei
Publication year - 2015
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.12497
Subject(s) - materials science , porosity , foaming agent , aeration , fraction (chemistry) , thermal conductivity , composite material , silicon nitride , nitride , chemical engineering , waste management , chromatography , layer (electronics) , chemistry , engineering
A new foaming route, which was imitated from the foaming of aerated foods, was used by the protein foaming method in preparing highly porous silicon nitride (Si 3 N 4 ) foams. Effects of air fraction on the structure and property of the products were investigated. It was indicated that the porosity increased with the air fraction exponentially, whereas the air fraction had little effect on the average pore sizes of Si 3 N 4 foams. Thermal conductivity of the product measured using the laser flash method decreased from 4.07 to 2.29 W/(m·K) when the porosity increased from 80.00% to 87.61%.