Thermal shock resistance of porous Al2O3-mullite ceramics

Zaķe-Tiļuga, Ieva; Švinka, Visvaldis; Švinka, Ruta; Grase, Līga

doi:10.1016/j.ceramint.2015.05.116

Cited by 36 publications

(8 citation statements)

References 20 publications

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“…However, such an approach requires three key factors: (1) interconnected pore structure; (2) high porosity of pore struts and (3) uniform distribution of catalyst throughout the volume of ceramic foam. For example, it is possible to use kaolinite or bentonite-type clay foams with a very low Fe 2 O 3 content or Al 2 O 3 ( Svinka et al, 2011 , Zake-Tiluga et al, 2014 ), SiO 2 ( Binks, 2002 ), cordierite ( Song et al, 2006 ), mullite ( Zake-Tiluga et al, 2015 ) or other foams ( Colombo and Scheffler, 2005 ); however, during production, these materials will need to saturate with catalysts such as magnesium oxide (MnO) or Fe 2 O 3 .…”

Section: Literature Reviewmentioning

confidence: 99%

Using circular economy principles to recycle materials in guiding the design of a wet scrubber-reactor for indoor air disinfection from coronavirus and other pathogens

Шишкин

Goel

Baronins

et al. 2021

Environmental Technology & Innovation

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An arduous need exists to discover rapid solutions to avoid the accelerated spread of coronavirus especially through the indoor environments like offices, hospitals, and airports. One such measure could be to disinfect the air, especially in indoor environments. The goal of this work is to propose a novel design of a wet scrubber-reactor to deactivate airborne microbes using circular economy principles. Based on Fenton’s reaction mechanism, the system proposed here will deactivate airborne microbes (bioaerosols) such as SARS-CoV-2. The proposed design relies on using a highly porous clay-glass open-cell structure as an easily reproducible and cheap material. The principle behind this technique is an in-situ decomposition of hydrogen peroxide into highly reactive oxygen species and free radicals. The high porosity of a tailored ceramic structure provides a high contact area between atomized oxygen, free radicals and supplied polluted air. The design is shown to comply with the needs of achieving sustainable development goals.

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Section: Literature Reviewmentioning

confidence: 99%

Using circular economy principles to recycle materials in guiding the design of a wet scrubber-reactor for indoor air disinfection from coronavirus and other pathogens

Шишкин

Goel

Baronins

et al. 2021

Environmental Technology & Innovation

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“…SEM attēlos (14. a att.) ir redzams grauds, kurš pat pēc pārejas uz α-Al2O3 modifikāciju ir saglabājis savas kontūras un kuru aptver α-Al2O3 graudi [13]. Šo paraugu īpašības apkopotas IV.…”

Section: Visvaldis šVinka Ruta šVinkaunclassified

Augsti poraina oksīdu keramika

Švinka

2018

SJ MSAC

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Silikātu materiālu institūtā kopš 2004. g. tiek veikti pētījumi par augsttemperatūras augsti porainu oksīdu keramiku, kas iegūta ar koncentrētas oksīdu pulveru suspensijas liešanas paņēmienu. Poru veidošanās notiek ķīmiskas reakcijas ceļā starp metāliska alumīnija pulveri un ūdeni bāziskā vidē, kur suspensijas pH ir 9,5–10,8. Tādā veidā netiek emitēts CO2, kas parasti notiek, iegūstot keramikas materiālus ar paaugstinātu porainību.Laikā kopš 2007. g. sintezēti materiāli un veikti pētījumi vairākās augsttemperatūras oksīdu sistēmās: cirkonija oksīdu saturošā (promocijas darbs, G. Buļa, Cirkonija oksīdu saturoša augsttemperatūras putu keramika, 2008. g.), korunda- mullīta sistēmā (promocijas darbs, L. Mahņicka-Goremikina, Sintēzes apstākļu un leģējošu piedevu ietekme uz porainas augsttemperatūras oksīdu keramikas īpašībām un struktūru, 2015. g.), alumīnija oksīda sistēmā ar dažādām piedevām (promocijas darbs, I. Zaķe-Tiļuga. Mullītu veidojošu piedevu ietekme uz porainas alumīnija oksīda keramikas īpašībām, 2015. g.; nepabeigts promocijas darbs A. Butlers, Karstumizturīga filtrējoša keramika; maģistra darbs, J. Bobrovika, Augsti poraina siltumizolējoša kordierīta keramika). Pētītie materiāli paredzēti, lai izmantotu tos kā siltumizolējošus materiālus dažādām augsttemperatūras siltuma ierīcēm un arī karstumizturīgiem filtriem.Highly Porous Oxide CeramicsInvestigations of highly porous high temperature ceramic produced by slip casting from concentrated suspensions of raw materials were carried out in the Institute of Silicate Materials since 2004. Pores form due to chemical reaction of metallic aluminium powder with water in basic medium with pH 9.5–10.8. Using this method emission of carbon oxide that usually accompanies fabrication of porous ceramics is avoided. The following investigations in high temperature oxide systems have been carried out since 2007:zirconia containing materials – promotion work by Gerda Bula “Zircon oxide containing high temperature foam ceramic”, 2008;corundum–mullite materials – promotion work by Ludmila Mahnicka- Goremikina “Influence of synthesis conditions and additives on the structure and properties of porous high temperature ceramics”, 2015;alumina materials with various additives – promotion work by Ieva Zake-Tiluga “The effect of mullite-forming additives on the properties of porous alumina ceramics”, 2015;titania containing corundum–mullite materials;cordierite ceramic materials.The goals of these investigations were to obtain of high temperature insulating materials and ceramic filters for filtration of hot and aggressive liquids. Properties of ceramics, such as dependence of thermal conductivity on the temperature and thermal shock durability, were determined.Keywords: aluminium oxide, zirconium oxide, titanium oxide, kaolin, talcum, cordierite, nanopowders, thermal insulation, thermal shock resistance.

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“…Thermal shock resistance (TSR) is one of a major topic for the application of alumina composites in the high-temperature environment. The TSR has been investigated by various researchers for better understanding the mechanisms of improving TSR of Al 2 O 3 composites [31][32][33][34][35]. The improved TSR of Al 2 O 3 -SiC w composites were achieved by enhancing its densi cation and the content of yttrium aluminum garner, producing of tabular alumina [31].…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance and thermal shock resistance of alumina composites fabricated by temperature gradient spark plasma sintering

Sun

Zhao

Zhang

et al. 2020

Preprint

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Temperature gradient spark plasma sintering technology (TGSPS) was used to fabricate alumina composites with addition of tremolite. The mathematics model of TGSPS was established using piecewise interpolation spline function. Liquid phase sintering took place in the sintering process. Vickers hardness, fracture toughness and flexural strength of the composites were measured. Microstructure observations on fracture surfaces of alumina composites were analyzed. Thermal shock resistance of alumina composites was investigated by measuring the strength retention after varying the temperature difference through the water-quench method. Results showed that the addition of tremolite could promote the liquid phases sintering of alumina composites, decrease the porosity, strength the grain boundaries, improve the mechanical properties, and thus contribute to the improvement in TSR of alumina composites.

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Thermal shock resistance of porous Al2O3-mullite ceramics

Cited by 36 publications

References 20 publications

Using circular economy principles to recycle materials in guiding the design of a wet scrubber-reactor for indoor air disinfection from coronavirus and other pathogens

Using circular economy principles to recycle materials in guiding the design of a wet scrubber-reactor for indoor air disinfection from coronavirus and other pathogens

Augsti poraina oksīdu keramika

Mechanical performance and thermal shock resistance of alumina composites fabricated by temperature gradient spark plasma sintering

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