Explanation

electric conductivity greater than 10_ 2S/ma is a kind of ceramics materials. Generally, it can be divided into non oxide conductive ceramics and oxide conductive ceramics. Non oxide conductive ceramics include silicon carbide (SiC), molybdenum disilicide (MoSi2), zirconium boride (ZrB2), etc. Their service temperatures are 1450 ℃, 1700 ℃, 2000-2800 ° C respectively. SiC and MoSi2 have lower room temperature resistance and good high-temperature stability, but MoSi2 has lower mechanical strength and greater brittleness, and is commonly used as a high-temperature heating element; ZrBa can be used as the electrode materials of the runway in the magnetohydrodynamic power generation (MHD) machine. There are many kinds of oxide conductive ceramics, mainly including ZrO2 and other doped or undoped oxide sinters (or solid solution), which are more resistant to high temperature and oxidation than non oxide conductive ceramics, and are more widely used. According to the type of conductive particles, they can be divided into conductive ceramics by electron, ion conductive ceramics (which can also be divided into anionic conductive ceramics and cationic conductive ceramics) and mixed conductive ceramics.

Classification