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The square-wave pulse heat method was improved to measure thermal properties of vitreous samples by considering radiation heat transfer between the front and back faces of the samples, and the measurement accuracy of the method was examined.Thermal properties of CaO–SiO2–Al2O3 samples were measured by the method. Thermal diffusivities of the crystalline 40CaO–40SiO2–20Al2O3 (mol%) sample are about 1.5–2.5 times larger than those of the vitreous sample. Specific heat of the crystalline and vitreous samples shows almost the same temperature dependency, except the highest measurement temperature due to crystallization of glass.Finally, we investigated the reason that the thermal conductivity values measured by the improved square-wave pulse heat method differ from those by the line source method. As a result, crystallization of glass during the measurements would cause the difference of the temperature dependencies of the values measured by the two methods.

Application of Square-wave Pulse Heat Method to Thermal Properties Measurement of CaO–SiO2–Al2O3 System Fluxes