Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 38, Issue 2, Pages 679-686Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2017.09.003
Keywords
Acicular mullite; Porous ceramic; Al2O3 crystal type; Morphology; Formation mechanism
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Funding
- National Natural Science Foundation of China (NSFC) [51032007]
- Star Maker Space Incubation Project of Zhengzhou University of Light Industry [2017ZCKJ201]
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Porous mullite ceramics with different crystal shapes of mullite are fabricated by in-situ reaction with middle grade kyanite as raw material, Al(OH)(3), gamma-Al2O3, rho-Al2O3 and alpha-Al2O3 as alumina sources. Effects of Al2O3 crystal types on morphology evolution and formation mechanisms of mullite, and properties of porous ceramics are investigated. Results show that mullite in the sample with Al(OH)(3) mainly shows acicular morphology, because its (001) plane has the minimum interplanar crystal spacing and maximal attachment energy, it grows fast along [001] direction by screw dislocation mechanism. With a successive slowdown in reactivities of Al(OH)(3), gamma-Al2O3, rho-Al2O3 and alpha-Al2O3, the amount and aspect ratio of mullite reduce, its growth mechanism gradually transforms into two-dimensional nucleation. Acicular mullite not only reinforces samples, but makes effective pore sizes smaller, which enable the sample with Al(OH)(3) to present low bulk density, high apparent porosity and linear changes, small average pore size and good mechanical strength.
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