- High temperature resistance: Unlike general high-temperature materials, graphite not only does not soften when the temperature increases, but its strength also increases. At 2500 degrees Celsius, the tensile strength of graphite is twice that of room temperature.
- Thermal conductivity and conductivity: Due to the presence of residual electrons in the carbon atoms on the hexagonal mesh plane layer, and the presence of residual electrons in adjacent planes as electron clouds between the mesh planes, graphite has good thermal conductivity and conductivity. The thermal conductivity of graphite is exactly opposite to that of ordinary metal materials. It has a very high thermal conductivity at room temperature, but as the temperature increases, the thermal conductivity actually decreases. At extremely high temperatures, graphite even becomes a thermal insulator.
- Special seismic performance: The expansion of graphite is anisotropic, so the macroscopic expansion coefficient is not large. In the case of sudden temperature changes, the volume of graphite does not change much; In addition, its excellent thermal conductivity results in excellent thermal shock resistance of graphite.
- Lubricity: The interlayer of graphite is composed of Van der Waal forces, which have weak binding force and give it lubricity. The lubricity of graphite depends on the size of the graphite flakes. The larger the scale, the smaller the friction coefficient, and the better the lubrication.
- Good chemical stability and corrosion resistance: Graphite has good chemical stability at room temperature and is not affected by any strong acids, alkalis, or organic solvents; The carbon atoms in the graphite layer are firmly bonded by covalent bonds, resulting in low surface energy of graphite phosphorus sheets, which are not wetted by molten slag and have extremely strong corrosion resistance. However, graphite is prone to oxidation in the air, and anti oxidation measures should be taken when used in carbon bonded refractory materials.
Post time: 3月-20-2024
