Ceramic Capillary Suspensions: Novel Processing Route for Macroporous Ceramic Materials. Issue 2 (24th December 2012)

• Record Type: Journal Article
• Authors: Dittmann, Jens; Koos, Erin; Willenbacher, Norbert; Krell, A.
• Is Part Of: Journal of the American Ceramic Society. Volume 96:Issue 2(2013)
• Page Start: 391
• Page End: 397
• Publication Date: 2012-12-24
• Subjects: Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.12126
• Languages: English
• ISSNs: 0002-7820

Abstract

<abstract abstract-type="main" xml:lang="en" id="jace12126-abs-0001"> <title> <x xml:space="preserve">Abstract</x> </title> <p>We introduce a novel method to produce macroporous ceramics by capillary suspensions. Adding a small amount (~1 vol%) of an immiscible secondary phase to a low concentration (~20 vol%) suspension can increase the yield stress by several orders of magnitude. This drastic change in flow behavior is induced by the creation of a sample‐spanning particle network in the suspension controlled by capillary forces. This strong network may persist even if the primary bulk phase is removed. Accordingly, capillary suspensions can be used as a precursor for manufacturing porous materials. Here, we focus on the specific features of this universal, low‐cost processing route for porous ceramics. An Al₂O₃ model system is used to demonstrate how to adjust porosity and pore size. With this system, we were able to achieve open porosities higher than 60% with an average pore size below 10 μm.</p> </abstract>