Processing of Ceramic Foams with Hierarchical Cell Structure

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autorinnen und Autoren: Ceron-Nicolat B, Fey T, Greil P
Zeitschrift: Advanced Engineering Materials
Verlag: Wiley-VCH Verlag
Jahr der Veröffentlichung: 2010
Band: 12
Seitenbereich: 884-892
ISSN: 1438-1656


Abstract


Silicon carbide-based cellular ceramics characterized by a hierarchical pore structure were processed. An open-cellular PU foam template with a mean cell density of 10 pores per inch (ppi), equivalent to a cell diameter of 4 mm and a strut thickness of 250 mu m, was coated with a primary SiC slurry. Cross-linking of a polysiloxane binder at 190 h resulted in a SiC filled reticulated thermoset foam (first generation). Subsequently, this matrix foam was infiltrated with a second slurry of slightly different polysiloxane composition which upon heating to 290 degrees C caused bubble nucleation and formation of a second generation foam filling the cell space in the matrix foam skeleton. After pyrolysis at 1000 degrees C a SiC/Si-O-C reaction bonded composite foam with a hierarchical cell structure and a fractional density of 0.31 was obtained. SEM and X-ray mu-CT analyses confirm both generations of matrix as well as infiltrated foam to be open cellular but with a pronounced difference in cell size (matrix foam cell size 2.5 mm versus infiltrated foam cell size 0.29 mm). While the matrix foam skeleton provides control of macroscopic shape as well as density distribution in the component, single- or multistep foam infiltration may offer a high potential for improving the mechanical properties of hierarchical cellular materials. Thus, hierarchical structure formation offers a high potential to fabricate low density cellular ceramics which might be of interest for lightweight design of novel engineering materials.



FAU-Autorinnen und Autoren / FAU-Herausgeberinnen und Herausgeber

Fey, Tobias Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)
Greil, Peter Prof. Dr.
Lehrstuhl für Werkstoffwissenschaften (Glas und Keramik)


Zusätzliche Organisationseinheit(en)
Exzellenz-Cluster Engineering of Advanced Materials


Forschungsbereiche

E Lightweight Materials
Exzellenz-Cluster Engineering of Advanced Materials


Zitierweisen

APA:
Ceron-Nicolat, B., Fey, T., & Greil, P. (2010). Processing of Ceramic Foams with Hierarchical Cell Structure. Advanced Engineering Materials, 12, 884-892. https://dx.doi.org/10.1002/adem.201000114

MLA:
Ceron-Nicolat, Bruno, Tobias Fey, and Peter Greil. "Processing of Ceramic Foams with Hierarchical Cell Structure." Advanced Engineering Materials 12 (2010): 884-892.

BibTeX: 

Zuletzt aktualisiert 2018-02-07 um 11:23