| Crystallization Behaviour of Three Glass Compositions
in the System Li20-Al20 3-Si02 |
s. G. SAMDANT, Y. MURALI PRASAD AND ABDE ALI
Pages : 9-15
DOI : 10.1080/0371750X.1969.10855671 |
| Abstract |
| Three glass compositions, one corresponding to fl-Eucryptite, another corresponding
to Lithium Metasilicate and the third corresponding to 1070°C eutectic on the
lithium metasilicate-fl-eucryptite join in the composition triangle lithium metasilicate
-fl-spodumene-fl-eucryptite of the system Li20-Al20 3-Si02 were studied with respect
to their crystallization behaviour. The phases crystallizing out after different heat
treatment schedules and itsing different nucleating agents were identified by X-ray
diffraction patterns. In all cases, the initial crystallization product was Eucryptite
silica-0 form. However, in the case of 1070°C eutectic composition the development of
lithium metasi/icate phase was also noticed after heat treating at 800°C for 5 hours.
The first DT A peak due to crystallization was used to distinguish the effects of
Zr02, Ti02 and V20 5 as nucleating agents. With 5% zirconia additions the first crystallization
peak temperature was maximum while in the case of 5% V20 5 additions it was
minimum. There was, however, no change in the initial crystallization products with
and without the nucleating agents. |
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