电场
电介质
材料科学
陶瓷
介电强度
极限(数学)
聚合物
熔点
表征(材料科学)
电势能
热容
热力学
复合材料
纳米技术
功率(物理)
光电子学
物理
数学分析
数学
量子力学
作者
Ruzhuan Wang,Weiguo Li
标识
DOI:10.1002/adts.202200336
摘要
Abstract The electrothermal breakdown of high‐temperature dielectric materials has received increasing attention. However, the theoretical characterization of quantitative relationship between breakdown strength and temperature has been a challenge. Herein, a theory termed energy storage capacity has been developed to generate and understand the nature of this quantitative relationship. This theory defines a limit value of stored energy associated with the material breakdown, including electric energy and the equivalent heat energy. Then, a parameter‐free theoretical model of temperature‐dependent breakdown strength of materials is developed, which takes into account the effects of dielectric constant and melting point. This non‐fitting model, without the need to carry out any destructive experiments and data fitting, is validated with excellent agreement between the predicted and measured values of both polymers and ceramics, monolithic and multilayered polymer/ceramic composites. It is shown that the failure of large classes of substances, including ceramics and polymers under heat and electrical force or mechanical force can be accurately modeled using the concept of the temperature independent limit value of the stored energy. This should become the new insight and entry point for the development of quantitative characterization of temperature‐dependent physical and mechanical properties of materials.
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