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Tailored Porosity Gradients via Colloidal Infiltration of Compression‐Molded Sponges
Author(s) -
Cichocki Frank R.,
Trumble Kevin P.,
Rödel Jürgen
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02528.x
Subject(s) - porosity , materials science , ceramic , composite material , slurry , sintering , sponge , polymer , composite number , volume fraction , infiltration (hvac) , geology , paleontology
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.