Measuring The Coefficient Of Thermal Expansion Of Free-Standing Enamel Films

Digital image correlation (DIC) was applied to the measurement of the coefficient of thermal expansion (CTE) of ceramic enamel films between 100 and 300 deg C. The CTE of four different enamels were measured by DIC, and the data were correlated with the residual stresses on fired enamelled soda-lime glass substrates. For validation, the CTE of a zinc-containing alkali borosilicate glass was measured by DIC and push-rod dilatometry. The results suggested that DIC is an effective technique for measuring the CTE of ceramic enamel films.