AN345 – Characterization of glass-zh

INTRODUCTION

The Setsys Evolution, equipped with a furnace composed of a graphite heating element allows experiments to be carried out up to 1750°C. For the best accuracy and sensitivity, it is advised to use a probe made of silica which can be used between ambient and 1000°C. Thus, glasses can be characterized by different parameters such as : the glass transition temperature, the softening point, the true and average coefficients of thermal expansion α.

AN-345

EXPERIMENTAL

Sample : Sodic Silicate glass
Length : 3.10 mm
Mode : Compression (load : 10g)
Probe : Silica
Atmosphere : Helium
Procedure : 20 ® 1000°C (10 K.min-1)

CONCLUSION

The glass transition temperature and the softening point are found to be 550.6°C and 594.8°C respectively. Between 100 and 500°C the average coefficient of thermal expansion increases from 6.5 up to 8.10-6 K-1.