Publisher DOI: 10.1111/jace.13684
Title: Sintering Simulation of Periodic Macro Porous Alumina
Language: English
Authors: Besler, Robert 
Silva, Marcel Rossetti da 
Rosário, Jefferson J. do 
Dosta, Maksym 
Heinrich, Stefan 
Janßen, Rolf 
Editor: Bordia, R. 
Issue Date: 2015
Publisher: Wiley-Blackwell
Source: Journal of the American Ceramic Society 11 (98): 3496-3502 (2015)
Abstract (english): 
Three-dimensionally ordered macroporous (3DOM) ceramic materials are considered for a variety of applications. One of its many subclasses, inverse opals, is constituted by the ordered arrangement of the pores, resulting in the functionality of a photonic crystal and leading to strong reflection of incident electromagnetic radiation. Exposing these porous structures to high temperatures, however, can lead to sintering of the desired structure and loss of functionality. Therefore, discrete element method (DEM) simulations are performed on inverse opal structures with random homogenous distributed alumina particles forming the struts and nodes. Grain-boundary diffusion as well as surface diffusion are modeled via respective parameters of a contact model applied in MUSEN-DEM. Furthermore, the void to particle size ratio is varied to simulate fine and coarse grained 3DOM ceramics. Results indicate that nodes densify at higher rates and to a larger extent when compared to struts. An increase in the void to particle size ratio results in similar trends but with lower densification rates. This behavior is observed regardless whether surface or grain-boundary diffusion is considered as the dominant transport mechanism, with the latter giving higher densification rates. Variations in particle coordination due to the initial random packing favor local desintering, thereby causing the formation of defects/crack nuclei.
ISSN: 0002-7820
Journal: Journal of the American Ceramic Society 
Institute: Mehrskalensimulation von Feststoffsystemen V-EXK1 
Keramische Hochleistungswerkstoffe M-9 
Document Type: Article
Project: SFB 986: Teilprojekt A3 - Herstellung höherer hierarchischer Ebenen von Materialsystemen mit der Wirbelschicht-granulation und Diskrete-Elemente-Modellierung der Materialien 
SFB 986: Teilprojekt C4 - Deposition, Ordnung und mechanische Stabilität von Beschichtungen aus assemblierten Partikeln mit enger Größenverteilung 
SFB 986: Teilprojekt C5 - Oxidische Hochtemperatur-Schutzschichtsysteme mittels angepasster Porenstruktur 
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