Application and research on temperature performance of electrolyte based on special insulating glaze

Capacitance measurement technology has been extensively used in various industries, including petroleum, chemical, electric power, medical, and food, owing to its simple structure, low cost, and accurate measurements. Capacitance and the dielectric constant—key parameters of this technology—are most severely affected by temperature. In this study, a special insulating glaze material designed for high-temperature and high-pressure water environments is evaluated. Although its properties have been assessed comprehensively, the temperature dependence of its dielectric constant is not yet clear. To address this gap, in this study, metal tin, mercury, and high-temperature and high-pressure water are used as electrolytes to measure the temperature-dependent properties of the developed inorganic special insulating glaze and to explore its behavior under varying excitation frequencies. The results of these tests are analyzed using dielectric wettability to determine the change in the capacitance temperature coefficient of the developed composite glaze with temperature in high-temperature and high-pressure water. This analysis allows the elucidation of the relationship between the temperature coefficient and temperature at different excitation frequencies. These findings provide valuable scientific data for the engineering application of the composite special insulating glaze and lay a solid foundation for the development and advancement of “conductive liquid–nonconductor” two-phase flow measurement technology in high-temperature and high-pressure environments.