Nucleation-controlled freeze casting of preceramic polymers for uniaxial pores in Si-based ceramics

A grain-selection template was applied to freeze casting to control nucleation of pore-forming crystals and achieve ceramics with highly aligned pore structures. A polymethylsiloxane preceramic polymer was freeze cast with cyclohexane as a solvent to produce dendritic pores in SiOC. Image analysis a...

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Bibliographic Details
Published inScripta materialia Vol. 130; pp. 32 - 36
Main Authors Naviroj, Maninpat, Wang, Melody M., Johnson, Matthew T., Faber, Katherine T.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.03.2017
Subjects
Casting
Ceramics
Directional solidification
Ice templating
Porous material
Casting
Ceramics
Directional solidification
Ice templating
Porous material
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Summary:A grain-selection template was applied to freeze casting to control nucleation of pore-forming crystals and achieve ceramics with highly aligned pore structures. A polymethylsiloxane preceramic polymer was freeze cast with cyclohexane as a solvent to produce dendritic pores in SiOC. Image analysis and permeability measurements were performed to quantify the influence of various templates on sample properties. Results show that the percentage of porosity aligned along the freezing axis increased from 13.9% without a template to 92.6% with an optimal template. The Darcian permeability constant increased by more than 6-fold, from 3.4×10−12 to 2.1×10−11m2. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.10.038