Densification, phase composition, and properties of borosilicate glass composites containing nano-alumina and titania |
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Authors: | A A El-Kheshen M F Zawrah M Awaad |
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Affiliation: | (1) Department of Glass Research, National Research Center, 2622 Dokki, Cairo, Egypt;(2) Department of Refractory and Ceramics, National Research Center, 2622 Dokki, Cairo, Egypt |
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Abstract: | Five samples of glass/ceramic composites were prepared from borosilicate glasses and both nano-aluminum oxide and nano-titanium
oxide. The glass composite samples contain 10, 20, 30, 40, 50 wt.% of alumina and titania mixture. The ratio of Al2O3:TiO2 in the mixture was 1:1. The formation of cristobalite in the glass matrix of low firing glass/ceramic composite substrates
limits the efficiency of the ceramic substrate when it is used in circuit boards. In the present study, addition of both alumina
and titania to a borosilicate glass as a ceramic filler caused the diffusion of alumina and titania phases (anatase and rutile)
constituents into the glass matrix and prevented the formation of a cristobalite. Addition of both the ceramics suppresses
cristobalite formation more effectively than one of them used alone and results in lower dielectric constant and thermal expansion
coefficients. |
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