Improved Cyclic Sealability and Strengthening of Glass Composite Sealants by Adding Alkali Oxides and Alumina Nanofiller
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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Document Type: Research Article
Publication date: April 1, 2016
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