ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
Many ceramic materials are composed of various phases, which can differ in theirindividual thermal, elastic or electrical properties by orders of magnitude. The microstructuralarrangement of the phases controls important material properties of the composite. To simulatethese macroscopic material properties from the material properties of the constituting phases, a 3-DFEM model is used. The key for an adequate description of real materials is the accurate threedimensionalmodeling of their microstructure. Basic morphological parameters of many ceramicsare reflected by a modified Voronoi model, e.g.: the volume fractions, grain size ratios andcontiguity of the phases. By automatically generating thousands of test structures and comparingthem to quantitative data derived from image analysis of scanning electron micrographs, structuresare selected which closely fit to the microstructure of experimental samples. The modelconsiderations are illustrated on two types of bi-continuous ceramic materials, a porous alumina(Al2O3) and a dense zirconia toughened alumina (ZTA) ceramic. Using different volume fractionsof the phases, Voronoi type microstructures and truncated sphere models are exemplified. For thesetwo ceramic systems, elastic moduli and thermal conductivity are calculated and compared toexperimental data of samples of the respective microstructure
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.45.89.pdf
Permalink