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1916-2016

Notes on the Possibility of Preparing Glasses Containing P2O5,Al2O3,B2O3 and SiO2 JSGT_V21_T368-T382

Notes on the Possibility of Preparing Glasses Containing P2O5,Al2O3,B2O3 and SiO2 JSGT_V21_T368-T382

A preliminary survey has been made of the possibility of glass formation from the oxides P2O5, Al2O3, B2O3, and SiO2, with and without addition of basic oxides. A clear glass cannot be made from silica and metaphosphoric acid alone, but can be derived by first preparing silicon phosphate. The addition of small amounts of P2O5, Al2O3, TiO2, or ZrO2 to boric oxide results in glasses which are opal on cooling or on subsequent softening. It does not seem probable that an extensive series of P2O5, B2O3–SiO2 or P2O5–B2O3–Al2O3 glasses can be prepared. Al2O3–SiO2–B2O3 mixtures containing only 5% Al2O3 may be melted at 1500° to clear glasses provided the silica content is sufficiently high. P2O5–SiO2–Na2O and P2O5–Al2O3-Na2O glasses may be prepared containing only a limited amount of silica or alumina. Glasses containing P2O5–B2O3–Na2O are clear when sufficient Na2O is present and resistant to atmospheric attack with high percentages of P2O5. The limits of glass formation at temperatures up to 1600° have been determined in the series Al2O3–SiO2–Na2O; Al2O3–SiO2–CaO; Al203–SiO2–B2O3–Na2O; Al2O3–SiO2–B2O3–CaO. With 15% CaO and 40% SiO2 in the last series as much as 40% alumina may be introduced into the glass.

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