Tailored Porosity Gradients via Colloidal Infiltration of Compression-Molded Sponges

A technique for producing ceramic preforms with graded porosity via colloidal infiltration of molded polymer sponges has been developed. Polymer sponges have been compression molded into various shapes with continuous and/or stepwise gradients in porosity. Infiltration of the graded sponge with cera...

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Bibliographic Details
Published inJournal of the American Ceramic Society Vol. 81; no. 6; pp. 1661 - 1664
Main Authors Jr. Cichocki, Frank R., Trumble, Kevin P., Rödel, Jürgen
Format Journal Article
LanguageEnglish
Published Westerville, Ohio American Ceramics Society 01.06.1998
Blackwell
Wiley Subscription Services, Inc
Subjects
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Exact sciences and technology
Miscellaneous
Technical ceramics
Pyrolysis
Gradient
Polymer
Experimental study
Porous material
Oxide ceramics
Compression molding
Colloidal suspension
Infiltration
Manufacturing
Porosity
Microstructure
Alumina
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Summary:A technique for producing ceramic preforms with graded porosity via colloidal infiltration of molded polymer sponges has been developed. Polymer sponges have been compression molded into various shapes with continuous and/or stepwise gradients in porosity. Infiltration of the graded sponge with ceramic slurry, followed by pyrolysis of the sponge and sintering of the ceramic, produces a ceramic component with graded porosity. A relationship between compressive strain and the volume fraction of porosity in the sponge has been derived and compared to measured values. The applicability of this technique to the manufacture of planar and axisymmetric composite shapes is demonstrated.
Bibliography:ArticleID:JACE1661
istex:E7B9A8998A6E547E696C9E1F238CF5399B5B98E9
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Presented at the 99th Annual Meeting of the American Ceramic Society, Cincinnati, OH, May 5, 1997 (International Symposium on Functionally Graded Materials, Paper No. SXII‐009‐97).
Member, American Ceramic Society.
J. A. Lewis—contributing editor
Supported by National Science Foundation Grant No. DMR 9357496 and Army Research Office MURI Grant No. DAAH 04‐96‐1‐0031.
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ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1998.tb02528.x