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设计了一种脉冲形成线用新型CaO-TiO_2-Al_2O_3基介质陶瓷体系,采用传统固相法通过优化组分和制备工艺,调控材料的微结构,获得了介电性能优异的介质陶瓷。其介电常数在15~35之间可调,介电损耗小于0.002,频率稳定性好。在厚度为1mm时,介电强度高达50kV/mm。研究了厚度对CaO-TiO_2-Al_2O_3基介质陶瓷介电强度的影响规律,当厚度从1mm减小到0.1mm时,介电强度呈非线性增大,从50kV/mm(1mm厚样品)提高到92kV/mm(0.1mm厚样品),可见,CaO-TiO_2-Al_2O_3基介质陶瓷的电击穿与其机械损坏具有相似性。结合CaO-TiO_2-Al_2O_3基介质陶瓷的化学组分和微观结构,CaO-TiO_2-Al_2O_3基介质陶瓷优越的电击穿特性可以用弱点击穿理论解释。
A new type of CaO-TiO_2-Al_2O_3-based dielectric ceramic system for pulse formation was designed. The microstructure of the material was controlled by the traditional solid-state method by optimizing the composition and preparation process and obtained the dielectric ceramic with excellent dielectric properties. The dielectric constant adjustable between 15 ~ 35, dielectric loss less than 0.002, good frequency stability. Dielectric strength is as high as 50 kV / mm at a thickness of 1 mm. The influence of thickness on the dielectric strength of CaO-TiO_2-Al_2O_3-based dielectric ceramics was investigated. When the thickness decreased from 1mm to 0.1mm, the dielectric strength increased nonlinearly from 50kV / mm (1mm thick sample) to 92kV / mm (0.1mm thick sample). It can be seen that the electrical breakdown of CaO-TiO_2-Al_2O_3-based dielectric ceramics is similar to that of mechanical damage. Combined with the chemical composition and microstructure of CaO-TiO 2 -Al 2 O 3 -based dielectric ceramics, the superior electrical breakdown behavior of CaO-TiO 2 -Al 2 O 3 -based dielectric ceramics can be explained by weak-breakdown theory.