The thermal expansion behaviour of some glasses and glass-ceramics within the system spodumene (LiAlSi2O6) - celsian (BaAl2Si2O8) containing LiF, TiO2 and Cr2O3 as nucleation catalysts was described. LiF and TiO2 were found to increase the thermal expansion of the glasses investigated, whereas Cr2O3 slightly lowered the expansion coefficient. The dilatometric transition and softening points of the glasses showed the reverse behaviour. The thermal expansion of the glass-ceramics was a function of type and amount of nucleating agent and heat treatment which greatly affected the mineralogical constitution of the materials.
Origin
Saudi Geological Survey, Jeddah
Journal Title
Glas Sci Technol 78 5 2005 189-194
Sector
Glass Ceramics
Class
GC 648