What is the difference between carbon black and graphite?
Jul 21, 2021
1) Different meanings
Carbon black: also known as carbon black, is an amorphous carbon. Light, loose and very fine black powder with a very large surface area ranging from 10~3000m2/g. It is a carbonaceous material (coal, natural gas, heavy oil, fuel oil, etc.) that undergoes incomplete combustion or thermal decomposition under insufficient air conditions. And the product.
Graphite: An allotrope of carbon. It is a gray-black, opaque solid, with a density of 2.25 grams per cubic centimeter, a melting point of 3652°C, and a boiling point of 4827°C. It has stable chemical properties, corrosion resistance, and does not react easily with chemicals such as acids and alkalis. It burns in oxygen to produce carbon dioxide at 687°C.
2) Different structure
Carbon black: It is expressed in terms of the degree to which carbon black particles aggregate into a chain or grape shape. Carbon black composed of agglomerates composed of the size and shape of the agglomerates and the number of particles in each agglomerate is called high-structure carbon black.
Graphite: A transition type crystal between atomic crystals, metal crystals and molecular crystals. In the crystal, the carbon atoms in the same layer are sp2 hybridized to form a covalent bond. Each carbon atom is connected to three other carbon atoms, and the six carbon atoms form a regular hexagonal ring on the same plane, which stretches to form a lamellar structure. .
3) Different in nature
Carbon black: The pyrone structure can be detected in the furnace black, which determines the basic properties of the furnace black. Volatile content can judge the concentration of surface functional groups, and can also measure the polarity of carbon black.
Graphite: The ink is soft, dark gray, greasy, and can stain paper. The hardness is 1-2, and the hardness can increase to 3-5 with the increase of impurities in the vertical direction. The specific gravity is 1.9 to 2.3. The specific surface area is concentrated in the range of 1-20m2/g, and its melting point is above 3000 ℃ under the condition of oxygen isolation, which is one of the most temperature-resistant minerals. It can conduct electricity and heat.
