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Fabrication of calcium hexaluminate‐based porous ceramic with microsilica addition
Author(s) -
Li Yuanbing,
Xiang Ruofei,
Xu Nana,
Wang Qingheng,
Li Shujing,
Wu Mengfei,
Yang Chunrui
Publication year - 2018
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.12868
Subject(s) - silica fume , materials science , ceramic , composite material , shrinkage , aluminate , elastic modulus , calcium , porosity , cement , calcium carbonate , metallurgy
Calcium hexaluminate ( CA 6 )‐based porous ceramic was prepared with α‐alumina powders and nanometer‐sized calcium carbonate using a direct foaming technique with the addition of calcium aluminate cement and microsilica. The microsilica leads to the acceleration of CA 6 formation. Moreover, the shrinkage, densification, and elastic modulus at room temperature were enhanced with increasing microsilica content. But the hot elastic modulus showed obvious reduction between 1100°C and 1200°C if the microsilica content was over 0.5 wt%. Furthermore, α‐Al 2 O 3 appeared in the specimens with and without microsilica after treatment at 1550°C, and the proportion of CA 6 grains having a high aspect ratio increased after microsilica addition.