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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20504 - Ceramics

Projekt

<a href="/cs/project/GA15-18513S" target="_blank" >GA15-18513S: Příprava a charakterizace oxidové a silikátové keramiky s řízenou mikrostrukturou a modelování souvislostí mezi mikrostrukturou a vlastnostmi</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Ceramics International

ISSN

0272-8842

e-ISSN

—

Svazek periodika

44

Číslo periodika v rámci svazku

11

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

14

Strana od-do

12315-12328

Kód UT WoS článku

000436351700051

EID výsledku v databázi Scopus

2-s2.0-85045089623