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The Characteristics Of The Expanded Graphite You Know?
- Sep 15, 2017 -

The characteristics of the Expanded Graphite you know?
Expanded Graphite is a kind of elemental carbon of elemental carbon. Each carbon atom is surrounded by three other carbon atoms (arranged in a honeycomb-like hexagon) to covalently bond to form a covalent molecule. Since each carbon atom emits an electron, the electrons are free to move, so that the Expanded Graphite belongs to the conductor. Expanded Graphite is one of the softest minerals, its use includes the manufacture of pencil lead and lubricant. Carbon is a non-metallic element that is located in the second periodic IVA family of the periodic table. Latin for Carbonium, meaning "coal, charcoal", Chinese characters "carbon" word by the wood "charcoal" word plus stone word side, from the "charcoal" pronunciation.
At room temperature, the chemical properties of elemental carbon are relatively stable, do not dissolve in water,
Dilute alkali and organic solvent; at high temperature and oxygen reaction combustion, the formation of carbon dioxide or carbon monoxide; in the halogen only fluorine can react directly with the elemental carbon; in the heating, the elemental carbon is more easily acid oxidation; at high temperatures, Many metal reacts to produce metal carbides. Carbon is reducible and smelting metals at high temperatures. In addition, recent studies have found that Expanded Graphite can be dissolved in chlorosulfonic acid to form a single layer of expanded fumene chlorosulfonic acid "solution".
Expanded Graphite is a carbonaceous element crystalline mineral, its crystalline frame for the hexagonal layered structure. The distance between each network layer is 340pm, and the spacing of carbon atoms in the same network layer is 142pm. Is hexagonal system, with a complete layered cleavage. Cleavage surface to the main molecular bond, the molecular attraction is weak, so the natural floatability is very good.
Expanded Graphite and diamond, carbon 60, carbon nanotubes are all carbon elements of the element, they are all the same shape.
Expanded Graphite is a kind of elemental carbon of elemental carbon. Each carbon atom is surrounded by three other carbon atoms (arranged in a honeycomb-like hexagon) to covalently bond to form a covalent molecule. Since each carbon atom emits an electron, the electrons are free to move, so that the Expanded Graphite belongs to the conductor, and the Expanded Graphite is one of the softest minerals, and its use includes the manufacture of a pencil lead and a lubricant. Carbon is a non-metallic element that is located in the second periodic IVA family of the periodic table.
Expanded Graphite is a kind of elemental carbon of elemental carbon. Each carbon atom is surrounded by three other carbon atoms (arranged in a honeycomb-like hexagon) to covalently bond to form a covalent molecule. Molecular formula: C
Expanded Graphite has the following special properties:
1) High temperature resistance: Expanded Graphite melting point of 3850 ± 50 ℃, boiling point of 4250 ℃, even by ultra-high temperature arc burning, the weight loss is very small, thermal expansion coefficient is also very small. The strength of the Expanded Graphite is enhanced with the increase of the temperature, and the strength of the Expanded Graphite is doubled at 2000 ℃.
2) conductive, thermal conductivity: the conductivity of Expanded Graphite than ordinary non-metallic mine one hundred times higher. Thermal conductivity than steel, iron, lead and other metal materials. Thermal conductivity decreases with increasing temperature, even at very high temperatures, the Expanded Graphite into a thermal insulation. Expanded Graphite can be conductive because each carbon atom in the Expanded Graphite forms only three covalent bonds with other carbon atoms, and each carbon atom retains one free electron to transfer charge.
3) Lubrication: The lubricity of Expanded Graphite depends on the size of the Expanded Graphite scale, the larger the scale, the smaller the coefficient of friction, the better the lubrication performance.
4) Chemical stability: Expanded Graphite at room temperature has good chemical stability, acid, alkali and resistance to organic solvent corrosion.
5) Plasticity: Expanded Graphite toughness, can be crushed into thin slices.
6) thermal shock resistance: the use of Expanded Graphite at room temperature can withstand the dramatic changes in temperature without damage, the temperature mutation, the volume of Expanded Graphite does not change, no cracks.