Effect of Sintering Temperature on the Physical Properties of Titania-Alumina-Silver Nitrate Foam

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.

• Periodical: Applied Mechanics and Materials (Volumes 465-466)
• Pages: 877-880
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.465-466.877
• Online since: December 2013
• Authors: Sufizar Ahmad, N.H. Halim, Hariati Taib, Z. Harun
• Keywords: Density, Porosity, SEM, Shrinkage, Slurry, TiO₂-Al₂O₃-AgNO₃ Foam

References

[1] Department of Environment. River Water Pollution Sources Ministry of Natural Resources and Environment Federal Government Administrative Centre, Putrajaya, Malaysia. (November, 2010).

[2] J. Y. Zhang, M. F. Yi, X. Zeng. Compressive properties of open-cell ceramic foams. Department of Engineering Mechanics, Hunan University, Changsha 410082, China (2006).

[3] P. Colombo, J. R. Hellmann. Ceramic foams from preceramic polymers. (2002).

[4] L.C. Chuan. Pembangunan Dan Penghasilan Titanium Berbusa. Bangi, Master thesis, Universiti Kebangsaan Malaysia. (2005).

[5] C. Falamaki, M. S Afarani, A. Aghare, Initial sintering stage pore growth mechanism applied to the manufacturing of ceramic membrane support, Journal of European Ceramic Society 24 (2004) 2285-2292.

DOI: 10.1016/s0955-2219(03)00643-5

[6] R.M. German, Sintering Theory and Practice. USA : Wiley-Interscience Publication. (1996).

[7] S. Ahmad, N. Muhamad, A. Muchtar, J. Sahari, M. H. I. Ibrahim, K. R. Jamaludin, N. H. Mohamad Nor and Murtadhahadi, Pencirian Titanium Berbusa yang Dihasilkan pada Suhu Pensinteran yang Berbeza Menggunakan Kaedah Buburan. Sains Malaysiana 39(1)(2010).

DOI: 10.17576/jsm-2017-4610-37