Manufacturing Ceramic Foams at Very High Temperature by the Unconventional Process of Direct Microwave Heating

Journal La Multiapp

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Field Value
 
Title Manufacturing Ceramic Foams at Very High Temperature by the Unconventional Process of Direct Microwave Heating
 
Creator Paunescu, Lucian
Axinte, Sorin Mircea
Dragoescu, Marius Florin
Cosmulescu, Felicia
 
Subject Ceramic Foam
Silicon Carbide
Direct Microwave Heating
Silica
Compressive strength
 
Description Abstract                                                        
SiC ceramic foams were manufactured by direct microwave heating up to 1520 ºC. Silicon carbide (42-68 wt.%), quartz sand as a silica supplier (20-38 wt.%), coal fly ash (12-20 wt.%) and a constant water addition of 15 wt.% were used as starting materials. The ceramic foam samples had semi-open microstructures in which neighboring cells are partially connected to each other and partially closed. Due to the very dense cellular walls and the very low cells size (below 21 μm), the compressive strength had very high values (41.3-56.5MPa), the porosity was within an average value range (52.4-57.6%) and the thermal conductivity and the apparent density had relatively high values. In energy terms, the technique of direct microwave heating was very advantageous, the specific energy consumption being very low (1.04-1.21 kWh/kg) compared to the consumptions achieved by conventional methods. The application field of SiC ceramic foams obtained by the bonding method and using silica as a bonding agent includes hot gas or molten metal filters, porous burners, catalytic supports and others. From the four tested experimental variants, it could be concluded that the optimal sample was that achieved at 1520 ºC with 68% silicon carbide, 20% quartz sand, 12% coal fly ash and 15% water addition, having the porosity of 57.6%, thermal conductivity of 0.174 W/m·K, compressive strength of 56.5 MPa and the equivalent pore size between 9-21 μm.
 
Publisher Newinera Publisher
 
Date 2020-12-18
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://www.newinera.com/index.php/JournalLaMultiapp/article/view/228
10.37899/journallamultiapp.v1i4.228
 
Source Journal La Multiapp; Vol. 1 No. 4 (2020): Journal La Multiapp; 7-17
2721-1290
2716-3865
 
Language eng
 
Relation http://www.newinera.com/index.php/JournalLaMultiapp/article/view/228/148
 
Rights Copyright (c) 2020 Journal La Multiapp
http://creativecommons.org/licenses/by-sa/4.0/
 

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