Formulation of glass ceramic foam from waste for low thermal conductivity application

Lau, Zi Hao (2018) Formulation of glass ceramic foam from waste for low thermal conductivity application. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

The objective of this project is to determine the effect of weight percentage of carbon black and waste soda lime silica glass on the physical, mechanical, thermal properties and phase and microstructure of glass ceramic foam produced. Based on previous research, influence of porosity on thermal conductivity had been studied and from here the quality of the glass ceramic foam produced can be improved. Sample had been produced with different weight percentage of carbon black, ball clay and waste soda lime silica glass which is group 1 with 89% of SLSG, 1 % CB, 10% ball clay, group 2 with 85% of SLSG, 5 % CB, 10% ball clay and group 3 with 80% of SLSG,10 % CB, 10% ball clay. After the samples is well mixed, a uniaxial die machine is used with 3.5 tons to form the samples in a cylindrical shape with diameter of 25mm and height of 5mm. After that, the sample is undergo sintering process in furnace at 850⁰C and a heating rate of 2⁰C/minute and then let it cool down naturally. Five testing had been carried out to analyse in term of physical and microstructure The testing that had been done is thermal expansion testing, micro hardness testing, SEM, XRD, and physical testing. From the result of the testing, we can see that when the amount of carbon black increase, the porosity of the sample will also increase. This can be proved by the result of apparent porosity testing where sample from group 1 had 12.06% of porosity, group 2 had 13.69% and group 3 had the highest amount of porosity which is 14.51%. Furthermore, the thermal expansion testing also proven that the sample with highest porosity will have the lowest CTE. In conclusion, the best formulation to produce glass ceramic foam is weight percentage of group 3 (80% SLSG, 10% CB and 10% ball clay). Further enhancement should be carry out on continue improving the thermal insulation properties of glass ceramic foam by increase the amount of carbon black addition.

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