Geopolymer composite foams reinforced with refractory filler: The effect of curing regime on microstructure, porosity and thermomechanical properties

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F49777513%3A23640%2F24%3A43972517" target="_blank" >RIV/49777513:23640/24:43972517 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1016/j.ceramint.2023.12.175" target="_blank" >https://doi.org/10.1016/j.ceramint.2023.12.175</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.ceramint.2023.12.175" target="_blank" >10.1016/j.ceramint.2023.12.175</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Geopolymer composite foams reinforced with refractory filler: The effect of curing regime on microstructure, porosity and thermomechanical properties

Popis výsledku v původním jazyce

Porous geopolymers with sustainable dimensional stability at high temperatures represent a noteworthy challenge for the development of thermomechanical, reliable and multifunctional composites. This study reports on the porosity formation of refractory-reinforced geopolymer paste via hydrogen peroxide decomposition. Reinforcing the slurry with ceramic chamotte and cordierite increases the apparent viscosity more than eight times in the interval to 100 s-1 retaining a pseudoplastic behavior. Cordierite particles increase the plastic viscosity at 6 Pa s and yield stress above 28 Pa. Surprisingly, the particulate ceramic filler acts as a porosity-modifier thereby reducing the mesoporosity region. Microstructural and porosity behavior was studied via digital microscopy, SEM, MIP and micro-CT. The wrinkled morphology of ceramics significantly affects the macroporosity formation in the region of 100 μm reaching a total porosity of ~60 vol%. The presence of large pores in the macro region and the high distribution of interconnected porosity in ceramics-reinforced composite foams resulted in compressive strengths ranging from 2 to 10 MPa. The effect of curing rate on porosity was most evident in the cordierite reinforcement which led to the occurrence of large interconnected pores. Based on thermomechanical analysis, the ceramic-reinforced foams show high dimensional stability with a reduction in total shrinkage to -0,71 % at 850 ◦C. These results may foster further developments of innovative routes for the synthesis of geopolymer composite foams for widespread technological applications.

Název v anglickém jazyce

Geopolymer composite foams reinforced with refractory filler: The effect of curing regime on microstructure, porosity and thermomechanical properties

Popis výsledku anglicky

Porous geopolymers with sustainable dimensional stability at high temperatures represent a noteworthy challenge for the development of thermomechanical, reliable and multifunctional composites. This study reports on the porosity formation of refractory-reinforced geopolymer paste via hydrogen peroxide decomposition. Reinforcing the slurry with ceramic chamotte and cordierite increases the apparent viscosity more than eight times in the interval to 100 s-1 retaining a pseudoplastic behavior. Cordierite particles increase the plastic viscosity at 6 Pa s and yield stress above 28 Pa. Surprisingly, the particulate ceramic filler acts as a porosity-modifier thereby reducing the mesoporosity region. Microstructural and porosity behavior was studied via digital microscopy, SEM, MIP and micro-CT. The wrinkled morphology of ceramics significantly affects the macroporosity formation in the region of 100 μm reaching a total porosity of ~60 vol%. The presence of large pores in the macro region and the high distribution of interconnected porosity in ceramics-reinforced composite foams resulted in compressive strengths ranging from 2 to 10 MPa. The effect of curing rate on porosity was most evident in the cordierite reinforcement which led to the occurrence of large interconnected pores. Based on thermomechanical analysis, the ceramic-reinforced foams show high dimensional stability with a reduction in total shrinkage to -0,71 % at 850 ◦C. These results may foster further developments of innovative routes for the synthesis of geopolymer composite foams for widespread technological applications.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20505 - Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics; filled composites)

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2024

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

1873-3956

Svazek periodika

50

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

12

Strana od-do

8397-8408

Kód UT WoS článku

001171136100001

EID výsledku v databázi Scopus

2-s2.0-85180604224