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Improved Cyclic Sealability and Strengthening of Glass Composite Sealants by Adding Alkali Oxides and Alumina Nanofiller

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In order to improve the cyclic sealing performance of alkaline-earth borosilicate glass sealants, the effects of adding an alkali oxide (4 mol% R2O where R is an alkali metal) and the Al2O3 nanofiller (5 vol%) on the viscosity, electrical characteristics, and sealing behavior during thermal cycling, were investigated. The glass viscosity was decreased by replacing 4 mol% SiO2 with an alkali oxide in a base alkaline-earth glass. The addition of the alumina nanofiller to the two different types of glasses increased the high-temperature electrical conductivities of the glass-composite sealants. A 48-h heat treatment of the alumina nanofiller enhanced devitrification of the glass phase, which was more pronounced for the alkaline-earth oxide glass composites. Experiments on the leak rate during thermal cycling showed better sealing performance for the glass-composite sealants that contained alkali and alkaline-earth oxides.
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Keywords: ALUMINA NANOFILLER; COMPOSITES SEALANTS; CYCLIC SEALING; ELECTRICAL CONDUCTIVITY; GLASS; VISCOSITY

Document Type: Research Article

Publication date: April 1, 2016

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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