三维连通网络碳化硅的电特性

Electrical properties of SiC 3-dimensional network

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》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/S1 cm-1.