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Abstract
The composition, MgO 20.3, Al2O3 18.3 and SiO2 61.4 per cent, corresponding to the ternary eutectic at 1345° in the system MgO-Al2O3-SiO2, can be approximately obtained using a mixture of talc and clay. Hot stage microscopic studies revealed that the gross eutectic mixture of talc and clay readily melts to clear glass at a temperature as low as 1375°C. The observation has been discussed in the light of earlier X-ray and DTA studies and it has been concluded that rapid vitrification of the mixture is due to high reactivity of the starting materials.
High temperature viscosity, thermal expansion, transverse strength, resistance to water attack, the DC and AC resistivities and dielectric strength of the eutectic glass composition were measured and it has been shown that most of the properties compare favourably with those of the soda-lime-silica and the heat resistant boro-silicate type of glasses.