Microstructure characterization of mullite foam by image analysis, mercury porosimetry and X-ray computed microtomography

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916701" target="_blank" >RIV/60461373:22310/18:43916701 - isvavai.cz</a>

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0272884218308769" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0272884218308769</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ceramint.2018.04.019" target="_blank" >10.1016/j.ceramint.2018.04.019</a>

Result language

angličtina

Original language name

Microstructure characterization of mullite foam by image analysis, mercury porosimetry and X-ray computed microtomography

Original language description

It is well known that the effective properties of porous ceramics and ceramic foams depend strongly on the microstructure. That means, the prediction of effective properties of real materials generally requires quantitative values of well-defined microstructural descriptors as input parameters. The present contribution shows that ceramic foams with hierarchical microstructure require a complex microstructural characterization procedure based on a combination of different complementary techniques. Taking a light-weight mullite foam - an important and versatile ceramic material (e.g. for furnace linings, kiln furniture and high-temperature filters) - as a paradigmatic example, a systematic methodology is proposed for extracting relevant microstructural information. The microstructure of mullite foam with hierarchical microstructure has been characterized by stereology-based image analysis, mercury porosimetry and computed microtomography (X-ray mu CT). Three metric descriptors (porosity, surface density, mean curvature integral density) and a topological descriptor (Euler characteristic density) have been determined, the latter being 192.4 +/- 17.7.10(-9) mu m(-3). SEM micrographs taken at different magnification allow to distinguish the porosity attributable to pore cavities (62.3-63.0%) and matrix (47.8-49.5%). Mean chord lengths and Jeffries sizes of the pores are 159-164 mu m and 164-180 mu m, respectively, for the pore cavities and 4.6-5.1 mu m and 4.9-5.1 mu m, respectively, for the matrix pores. Different types of pore size distributions have been determined, and it is found that in this specific case the size distribution of pore cavity sizes obeys a Rayleigh distribution. Mercury porosimetry covers small and medium-sized pore throats (median 76 mu m), whereas image analysis captures pore cavities (median 234-247 mu m) and X-ray mu CT combines information on both pore throats and cavities, resulting in an intermediate median of 206 mu m. The procedure proposed is very general and systematic and can be applied to porous materials with a wide range of microstructures.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20504 - Ceramics

Project

<a href="/en/project/GA15-18513S" target="_blank" >GA15-18513S: Processing and characterization of oxide and silicate ceramics with controlled microstructure and modeling of microstructure-property relations</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Ceramics International

ISSN

0272-8842

e-ISSN

—

Volume of the periodical

44

Issue of the periodical within the volume

11

Country of publishing house

US - UNITED STATES

Number of pages

14

Pages from-to

12315-12328

UT code for WoS article

000436351700051

EID of the result in the Scopus database

2-s2.0-85045089623