Effect of sintering temperature on the physical properties of titania-alumina-silver nitrate foam

Ahmad, Sufizar and Halim, N.H. and Taib, Hariati and Harun, Zawati (2014) Effect of sintering temperature on the physical properties of titania-alumina-silver nitrate foam. Applied Mechanics and Materials , 465 .

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Official URL: http://dx.doi.org/10.4028/www.scientific.net/AMM.4...

Abstract

Nowadays, ceramic foam was widely used in bio-medical as well as engineering field such as thermal insulation and adsorption of environmental pollutants. Ceramic foam made of a porous structure that provides the physical and mechanical properties of both, low specific weight and high thermal fluidity. In this study, the selected starting ceramics powder are titanium dioxide (TiO2), aluminum oxide (Al2O3) and Silver Nitrate (AgNO3). In general, TiO2 is very light weight compared to other substance. It is brightness and very high refractive index. On the other hand, Al2O3 is responsible for the resistance of metallic aluminum to weathering while AgNO3 is plays important role as antiseptics. These unique properties of these ceramics has encouraged more study to be implemented on it. Preferred method for the ceramic foam fabrication is via slurry method. In which consists steps of mixing, dipping, pressing, drying and sintering. Three different temperatures of 1200°C, 1250°C and 1300°C, with compositions of 22.5wt% of TiO2 + 7.5wt% Al2O3 + 1.25 wt% AgNO3 with 2.5wt% of Carbolic methylcelulose (CMC) and 7.5wt% Polyethylene glycol (PEG) are apply in this study. Analysis of the phases, morphology, porosity, density and sringkage were carried out on all samples. From this study, foams of 47.8% to 62.6% porosity using TiO2 + Al2O3 + AgNO3 were successfully produced. The highest porosity value of 62.61% was fabricated at 1200°C and the highest density value of 2.06% at 1300°C. Thus, it is concluded that the optimal fabrication slurry method parameters of sintering temperature of 1300°C and the compositions of 22.5wt% of TiO2 + 7.5wt% Al2O3 + 1.25wt% AgNO3 with 2.5 wt% of CMC and 7.5wt% PEG has absorbability of heavy metal and bacteria in pre-treatment process can be develope.

Item Type:Article
Uncontrolled Keywords:density; porosity; SEM; shrinkage; slurry; TiO2-Al2O3-AgNO3 foam
Subjects:T Technology > TA Engineering (General). Civil engineering (General) > TA164 Bioengineering
Divisions:Faculty of Mechanical and Manufacturing Engineering > Department of Materials Engineering and Design
ID Code:5675
Deposited By:Normajihan Abd. Rahman
Deposited On:03 Aug 2014 14:49
Last Modified:03 Aug 2014 14:49

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