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Effect of TiO2/Na2O on the crystallisation behaviour of SiO2–Al2O3–B2O3–P2O5 glass-ceramics

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This study aimed to develop a glass-ceramic based on the SiO2–Al2O3–B2O3–P2O5 system. The effect of the nucleating agent TiO2 and the alkali oxide Na2O on the crystallisation behaviour of SiO2–Al2O3–B2O3–P2O5 glass-ceramics was studied using XRD, DTA, and SEM. Results showed that when TiO2 content was 16 wt%, only the anatase crystallised producing a white glass-ceramic. When the TiO2 content was >16 wt%, both rutile and anatase formed, which produced a yellowish colour. When the TiO2 content was <15 wt%, the crystallized phase consisted of rutile, anatase and brookite, and the colour was grey white due to insufficient opacity. When the Na2O content was <8 wt%, anatase was easily formed. When the Na2O content was 10 wt%, rutile and anatase crystallised. When the Na2O content was >12 wt%, rutile, anatase and brookite were produced. Therefore, the contents of TiO2 and Na2O must be controlled at 16 and <8 wt%, respectively, to obtain a glossy white glass-ceramic.
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Document Type: Research Article

Publication date: December 1, 2015

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