Main materials: imported graphite, isostatic graphite, high strength and high purity graphite, fine structure graphite, graphite electrode
Due to its special structure, graphite
has the following special properties:
1) high temperature resistance: graphite melting point is 3850 + 50 ℃, boiling point is 4250 ℃, even by the ultra high temperature arc ignition, weight loss is small, thermal expansion coefficient is small. Graphite with temperature increase and strengthen the intensity, at 2000 ℃, the intensity of graphite double.
2) conductive, thermal conductivity, the conductivity of graphite nonmetalliferous ore is one hundred times higher than normal. Heat conductivity exceeds metallic materials such as steel, iron, lead, etc. The thermal conductivity decreases with increasing temperature, and even at very high temperatures, the graphite is an insulator. Graphite can be conductive because each carbon atom in graphite only forms three covalent bonds with other carbon atoms, each carbon atom still retains one free electron for transmission of charge.
3) lubricity: the lubricating properties of graphite are dependent on the size of graphite flake, the larger the scale, the smaller the friction coefficient and the better the lubricating performance.
4) chemical stability: the graphite has good chemical stability at normal temperature, which is capable of resisting acid, alkali and corrosion resistance of organic solvent.
5) plasticity: the form of graphite is so pliable, it can be crushed into thin slices.
6) thermal shock resistance:
the graphite can withstand severe changes in temperature without damage when used at ordinary temp., the volume of graphite changes little if the temperature is abrupt, and cracks are not produced.