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Effect of pyrolysis temperature on the microstructure and thermal conductivity of polymer-derived monolithic and porous SiC ceramics

Santhosh, Balanand and Ionescu, Emanuel and Andreolli, Francesco and Biesuz, Mattia and Reitz, Andreas and Albert, Barbara and Sorarù, Gian Domenico (2021):
Effect of pyrolysis temperature on the microstructure and thermal conductivity of polymer-derived monolithic and porous SiC ceramics.
In: Journal of the European Ceramic Society, 41 (2), pp. 1151-1162. Elsevier, ISSN 09552219, e-ISSN 1873-619X,
DOI: 10.1016/j.jeurceramsoc.2020.09.028,
[Article]

Abstract

The present work investigates the influence of pyrolysis temperature on the microstructure and thermal conductivity (lambda) of polymer-derived SiC ceramics. For the study, both monolithic thin ceramic disks and highly porous reticulated foams were considered. The lambda of the polymer-derived SiC disks were measured, in the temperature range 100 degrees C-1000 degrees C, to amount between 0.5 W.m(-1). K-1 and 47 W.m(-1). K-1 ms (porosity 79.5 %-99.0 %), ranges between 0.03 W.m(-1). K-1 and 0.19 W.m(-1). K-1. The thermal transport in polymer-derived SiC ceramics was observed to be more significantly governed by the nanocrystalline to crystalline transition which occurs at pyrolysis temperatures above 1200 degrees C as compared to mesopore formations or the nature and amount of free carbon.

Item Type: Article
Erschienen: 2021
Creators: Santhosh, Balanand and Ionescu, Emanuel and Andreolli, Francesco and Biesuz, Mattia and Reitz, Andreas and Albert, Barbara and Sorarù, Gian Domenico
Title: Effect of pyrolysis temperature on the microstructure and thermal conductivity of polymer-derived monolithic and porous SiC ceramics
Language: English
Abstract:

The present work investigates the influence of pyrolysis temperature on the microstructure and thermal conductivity (lambda) of polymer-derived SiC ceramics. For the study, both monolithic thin ceramic disks and highly porous reticulated foams were considered. The lambda of the polymer-derived SiC disks were measured, in the temperature range 100 degrees C-1000 degrees C, to amount between 0.5 W.m(-1). K-1 and 47 W.m(-1). K-1 ms (porosity 79.5 %-99.0 %), ranges between 0.03 W.m(-1). K-1 and 0.19 W.m(-1). K-1. The thermal transport in polymer-derived SiC ceramics was observed to be more significantly governed by the nanocrystalline to crystalline transition which occurs at pyrolysis temperatures above 1200 degrees C as compared to mesopore formations or the nature and amount of free carbon.

Journal or Publication Title: Journal of the European Ceramic Society
Journal volume: 41
Number: 2
Publisher: Elsevier
Uncontrolled Keywords: Polymer-derived ceramics, Monolithic SiC, Porous ceramics, SiC foams, Thermal conductivity, SILICON OXYCARBIDE GLASSES; STRUCTURAL-CHARACTERIZATION, MECHANICAL-PROPERTIES, CARBIDE FIBER, POLYCARBOSILANE, DENSE, FABRICATION, BEHAVIOR, PRECURSORS, STABILITY
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Anorganische Chemie
Date Deposited: 18 Jan 2021 06:42
DOI: 10.1016/j.jeurceramsoc.2020.09.028
Official URL: https://doi.org/10.1016/j.jeurceramsoc.2020.09.028
Additional Information:

Funding Information: University of Trento (UniTn), Italy. Ministry of Education, Universities and Research (MIUR), Grant Numbers PRIN2017 - 2017FCFYHK, PRIN2017 - 2017PMR932

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