Ti3+-Free Titanoborophosphate Glasses as Molding Glasses with High Refractive Indices

Ti3+-Free Titanoborophosphate Glasses as Molding Glasses with High Refractive Indices

Ti3+‐free titanoborophosphate TiO2–B2O3–P2O5 (TBP)‐based glasses were produced in order to obtain glasses with low Tg (1.8), and a short postannealing (PA) time (less than a few days). In addition, TBP‐based glasses with low Tg (1.85), and a short PA time were successfully developed with the substit...

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Veröffentlicht in:Journal of the American Ceramic Society 2009-06, Vol.92 (6), p.1250-1255
Hauptverfasser: Hashimoto, Tadanori, Murakami, Mika, Nasu, Hiroyuki, Ishihara, Atsushi, Kunii, Koki
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container_issue 6
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container_title Journal of the American Ceramic Society
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creator Hashimoto, Tadanori
Murakami, Mika
Nasu, Hiroyuki
Ishihara, Atsushi
Kunii, Koki
description Ti3+‐free titanoborophosphate TiO2–B2O3–P2O5 (TBP)‐based glasses were produced in order to obtain glasses with low Tg (1.8), and a short postannealing (PA) time (less than a few days). In addition, TBP‐based glasses with low Tg (1.85), and a short PA time were successfully developed with the substitution of Li2O and ZnO for B2O3. Some glasses had very suitable properties for precision glass molding (Tg=553°C, nd=1.851, PA time=4 days for 6Li2O·6ZnO·55TiO2·6B2O3·27P2O5 glass; Tg=563°C, nd=1.880, PA time=2 days for 5Li2O·60TiO2·10B2O3·25P2O5 glass; Tg=566°C, nd=1.885, PA time=3 days for 2.5Li2O·2.5ZnO·60TiO2·10B2O3·25P2O5 glass; and Tg=567°C, nd=1.890, PA time=1 day for 5Li2O·5ZnO·60TiO2·5B2O3·25P2O5 glass). The λ70% of TBP‐based glasses with nd>1.85 and commercially available molding glasses with nd>1.85 are 40–41 and 44–50, respectively, which means that these new glasses have even higher transparency in the visible region than those currently on the market. Thus, TBP‐based glasses are considered to be promising materials as molding glasses with high transparency, low Tg, and high nd.
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In addition, TBP‐based glasses with low Tg (&lt;570°C), high nd (&gt;1.85), and a short PA time were successfully developed with the substitution of Li2O and ZnO for B2O3. Some glasses had very suitable properties for precision glass molding (Tg=553°C, nd=1.851, PA time=4 days for 6Li2O·6ZnO·55TiO2·6B2O3·27P2O5 glass; Tg=563°C, nd=1.880, PA time=2 days for 5Li2O·60TiO2·10B2O3·25P2O5 glass; Tg=566°C, nd=1.885, PA time=3 days for 2.5Li2O·2.5ZnO·60TiO2·10B2O3·25P2O5 glass; and Tg=567°C, nd=1.890, PA time=1 day for 5Li2O·5ZnO·60TiO2·5B2O3·25P2O5 glass). The λ70% of TBP‐based glasses with nd&gt;1.85 and commercially available molding glasses with nd&gt;1.85 are 40–41 and 44–50, respectively, which means that these new glasses have even higher transparency in the visible region than those currently on the market. Thus, TBP‐based glasses are considered to be promising materials as molding glasses with high transparency, low Tg, and high nd.</abstract><cop>Malden, USA</cop><pub>Blackwell Publishing Inc</pub><doi>10.1111/j.1551-2916.2009.03003.x</doi><tpages>6</tpages></addata></record>
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title Ti3+-Free Titanoborophosphate Glasses as Molding Glasses with High Refractive Indices
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