Technical ceramics with predetermined electrophysical properties based on system ZnO—SrO—Al2O3—SiO2

Abstract

Modern high-temperature materials designed to radio-engineering systems protecting from external influences are considered. The obtaining possibility of radio-transparent ceramic, consists of Willemite and Slavsonite, at a temperature of 1200 °C has been studied. It is shown that the obtained ceramic materials satisfy the radio-transparent materials requirements by dielectric characteristics (ε < 10, tgδ = 10–2 ÷ 10–4). It was established that to preserve the concomitant phases of Hannite and Zincite, which impair the dielectric characteristics of the material, it is necessary to maintain the ratio of Willemite to Slavsonite as 1 : 1, taking into account the stoichiometry of these phases. This makes it possible to obtain the radio-transparent ceramic materials of the Willemite-Slavsonite composition with a low dielectric permittivity (ε = 5.9) and insignificant dielectric losses (tgδ = 0.004).