测试导电复合材料直流电阻的四端电极法

为了探讨基于网状或环状电极的直流四端电极法在导电复合材料电阻测试中应用的可行性,比较了应用于不同基体、不同导电填料的导电复合材料直流电阻测试的两端电极法和四端电极法,提出了网状或环状电极与导电复合材料之间接触电阻的计算方法并进行了验证.研究表明:基于网状或环状电极的直流四端电极法可消除在直流两端电极法测试中存在的电极与导电复合材料之间的接触电阻;电极与导电复合材料之间接触电阻是非欧姆性的,接触电阻的大小与被测导电复合材料自身性质有关,其数值是可求解的.基于网状或环状电极的直流四端电极法适用于测试导电复合材料的电阻.

DC four-electrode method for electrical resistance measurement of conductive composites

In order to explore the feasibility of applying DC four electrode method based on embedded gauze or loop electrode in electrical resistance measurement of conductive composites, DC four electrode method and DC two electrode method for electrical resistance measurement of composites with different matrix and conductive fillers are compared, and the calculation method of contact resistance between electrode and conductive composites is proposed and verified. Research results show that DC four electrode method can eliminate contact resistance between electrode and conductive composites, which exists in DC two electrode method. The contact resistance is non-ohmic and can be calculated, and its value depends on the property of measured conductive composites. DC four electrode method based on embedded gauze or loop electrode is suitable for electrical resistance measurement of conductive composites.