用有限元方法分析了三维连通网络碳化硅的电特性, 计算了电阻值. 结果表明, 计算值与测量值吻合得很好. 电压的加载位置对碳化硅三维连通网络的电流分布有较大的影响. 两端均匀加载电压有利于产生比较均匀的电流分布. 由金刚石点阵结构单胞所组成的网 络具有空间三维连通的特点, 而简单长方体单胞所组成的网络只具有一维连通的结构特征, 在$L/S\gg$1 cm$^{-1}$的情况下, 金刚石点阵结构型泡沫陶瓷内电流的分布仍具有三维连通特征.
A finite element analysis of a unit cell modeling of electrical characteristics of SiC three dimensional networks is presented. A reasonable theoretical formula describing the resistivity of SiC 3--D networks was established. Calculated results showed that a uniform electrical current distribution of SiC 3--D networks can be obtained when uniform voltages are applied. The networks with a diamond unit cell have 3--D connectivity characteristics, while the networks with a rectangular unit cell have one--dimension characteristics. Ceramic networks with a diamond unit cell still keep the 3--D connectivity characteristics when its $L/S\gg$1 cm$^{-1}$.
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