What are the characteristics of graphite materials
The graphite material is mainly composed of polycrystalline graphite. Graphite is a multi-layer laminated crystal with a hexagonal planar network structure between carbon atoms. Although graphite material is an inorganic non-metallic material, it has good thermal and electrical conductivity, and at the same time has a thermal expansion coefficient far lower than that of metal, a high melting point and chemical stability, which makes graphite materials very useful in industrial applications. High value. Graphite materials are chemically inert in non-oxidizing media and have good corrosion resistance. Except for strong acids and strong oxidizing media, graphite materials are not corroded by other acids, alkalis, and salts, and hardly react with organic compounds. .
Graphite material is also a kind of high temperature resistant material. Graphite will not melt under high temperature, but at 3350 under normal pressure. C began to slowly sublimate into gas. The strength of general materials will gradually decrease at high temperatures, while graphite materials are in 2000. C
On the contrary, the above high temperature strength doubles its normal temperature strength. In addition, graphite materials have excellent thermal shock resistance.
Heat-resistant materials have good self-lubricating properties and can be used as anti-wear lubricating materials in occasions where oil is avoided. Graphite has a small capture cross-section for high-energy neutrons and a large scattering cross-section. It has good neutron deceleration performance and strong resistance to neutron radiation damage. It can be used as a deceleration material and structural masonry in nuclear reactors. Graphite material has good physiological compatibility, and it has been widely used as a biochar material.