Новые нелинейные диэлектрические материалы для импульсных устройств

Abstract

Описаны технологии синтеза сегнетокерамических материалов с большими величинами нелинейной диэлектрической проницаемости и повышенными уровнями электрической прочности. Параметры синтезированных материалов позволяют использовать их в высоковольтных импульсных устройствах силовой электроники.

Various technologies of synthesis of ferroelectric ceramics are described. The сlassic technology of making techniques of a ferroelectric ceramics assume a refinement, interfusing and roasting of raw stocks. Failing is growth of sizes of domains at a roasting stage. The presented method of a vacuum aerosol deposition at ambient temperature allows to synthesize ceramics layers from a finely divided feed stock passing a roasting stage. Shortcomings of this method are complexity of obtaining the homogeneous deprived local defects of layers of ceramics on curved surfaces, and also existence of mechanical tension in the thickness of the synthesized ceramics. The method of microarc oxygenating which is deprived of these shortcomings is described. This method consists in formation on a surface of anelectrode of a layer of a dielectric covering which consists of oxides of the elements which are a part of metal of a substrate and electrolyte. However, this method does not allow to receive the resistant segneto-magnetic composites homogeneous electrically with an area more than 1 cm2. The solution of this question is application of a method of cold molding. The conducted researches allow to develop structures and technologies of synthesis the ferroelectric ceramics with larger values of a nonlinear dielectric permeability and electric strength elevated levels.