Upik Nurbaiti, - (2015) Use of Natural Silica Sand as a Component for Prospective Fuel Cell Sealing Materials. Advanced Materials Research, 1123. pp. 383-386. ISSN 1662-8985

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Abstract

A study to enhance the value of natural silica sand from Tanah Laut, South Kalimantan, Indonesia has been initiated. A number of local sands were selected as the candidates for the study. The selected sand contained more than 90% quartz was further processed to obtain a high purity initial powder using magnetic separation and immersion with HCl. The sealing materials were prepared by mixing the natural-sand-based silica (SiO2) powder with magnesia (MgO) and boria (B2O3) with composition of 70:10:20 by weight followed by uniaxial pressing and finally sintering at 1150°C for 1h and 4 h to produce ceramic composites. XRD measurement revealed that the ceramic contained quartz, protoenstatite, and clinoenstatite. The 1h and 4h ceramics exhibited 1.89% and 0.43% apparent porosity, 7.00 ×106 and 6.63×106 Ωcm electrical resistivity, 3.60 and 2.29 GPa Vickers microhardness, and 11.20×10-6 and 11.55×10-6 ppm/°C thermal expansion coefficient respectively. The 4h sample is more appropriate for sealing function in fuel cell than the 1h sample.

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