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Processing of polymer‐derived, aerogel‐filled, SiC foams for high‐temperature insulation

Zambotti, Andrea ; Ionescu, Emanuel ; Gargiulo, Nicola ; Caputo, Domenico ; Vakifahmetoglu, Cekdar ; Santhosh, Balanand ; Biesuz, Mattia ; Sorarù, Gian Domenico (2023)
Processing of polymer‐derived, aerogel‐filled, SiC foams for high‐temperature insulation.
In: Journal of the American Ceramic Society, 106 (8)
doi: 10.1111/jace.19118
Article, Bibliographie

Abstract

Porous polymer-derived ceramics (PDCs) are outperforming materials when low-density and thermal inertia are required. In this frame, thermal insulating foams such as silicon carbide (SiC) ones possess intriguing requisites for aerospace applications, but their thermal conductivity is affected by gas phase heat transfer and, in the high temperature region, by radiative mechanisms. Owing to the versatility of the PDC route, we present a synthesis pathway to embed PDC SiC aerogels within the open cells of a SiC foam, thus sensibly decreasing the thermal conductivity at 1000 degrees C from 0.371 W center dot m(-1)K(-1) to 0.243 W center dot m(-1)K(-1). In this way, it was possible to couple the mechanical properties of the foam with the insulating ability of the aerogels.The presented synthesis was optimized by selecting, among acetone, n-hexane, and cyclohexane, the proper solvent for the gelation step of the aerogel formation to obtain a proper mesoporous colloidal structure that, after ceramization at 1000 degrees C, presents a specific surface area of 193 m(2)center dot g(-1). The so-obtained ceramic composites present a lowest density of 0.18 g center dot cm(-3), a porosity of 90% and a compressive strength of 0.76 MPa.

Item Type: Article
Erschienen: 2023
Creators: Zambotti, Andrea ; Ionescu, Emanuel ; Gargiulo, Nicola ; Caputo, Domenico ; Vakifahmetoglu, Cekdar ; Santhosh, Balanand ; Biesuz, Mattia ; Sorarù, Gian Domenico
Type of entry: Bibliographie
Title: Processing of polymer‐derived, aerogel‐filled, SiC foams for high‐temperature insulation
Language: English
Date: August 2023
Publisher: Wiley
Journal or Publication Title: Journal of the American Ceramic Society
Volume of the journal: 106
Issue Number: 8
DOI: 10.1111/jace.19118
Abstract:

Porous polymer-derived ceramics (PDCs) are outperforming materials when low-density and thermal inertia are required. In this frame, thermal insulating foams such as silicon carbide (SiC) ones possess intriguing requisites for aerospace applications, but their thermal conductivity is affected by gas phase heat transfer and, in the high temperature region, by radiative mechanisms. Owing to the versatility of the PDC route, we present a synthesis pathway to embed PDC SiC aerogels within the open cells of a SiC foam, thus sensibly decreasing the thermal conductivity at 1000 degrees C from 0.371 W center dot m(-1)K(-1) to 0.243 W center dot m(-1)K(-1). In this way, it was possible to couple the mechanical properties of the foam with the insulating ability of the aerogels.The presented synthesis was optimized by selecting, among acetone, n-hexane, and cyclohexane, the proper solvent for the gelation step of the aerogel formation to obtain a proper mesoporous colloidal structure that, after ceramization at 1000 degrees C, presents a specific surface area of 193 m(2)center dot g(-1). The so-obtained ceramic composites present a lowest density of 0.18 g center dot cm(-3), a porosity of 90% and a compressive strength of 0.76 MPa.

Uncontrolled Keywords: aerogel, cellular structure, polymer-derived ceramic, silicon carbide, thermal insulation, thermal-conductivity, low-density, porosity, carbon, ultralight, systems
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
Date Deposited: 07 Jun 2023 05:13
Last Modified: 07 Jun 2023 09:50
PPN: 508373247
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