Artificial Graphite
Size
0.01mm or 0.07mm,etc
Package
25 kg small bags into ton bags or ton bags
Features
Good wear resistance, corrosion resistance, good thermal conductivity, etc.
Application
Can be used in making heat exchanger, reaction tank, absorption tower, etc.
There are many kinds of artificial graphite and different production processes. In a broad sense, all graphite materials obtained by carbonization of organic matters and treated by high temperature after being treated with graphite can be collectively referred to as artificial graphite.In the narrow sense, artificial graphite usually refers to the massive solid materials prepared by batching.
Request a quoteIn recent years, artificial graphite has appeared more and more, because, for the sake of economic development, the governments in regions rich in natural graphite resources actively promote the development of the natural graphite industry and set off an upsurge of developing man-made graphite products with natural graphite as raw material.
It should be said that it is an important way to expand the application field of natural graphite to learn from the preparation process of artificial graphite and develop new graphite products. However, due to the connection and difference between the two in structure, performance, and use, it is necessary to analyze and discuss, so that managers and researchers can correctly understand and use natural graphite materials, Making the development of new natural graphite products more healthy and efficient.
Basic structure, properties, and classification of graphite
Crystal structure of graphite
Graphite is composed of a single carbon element, and its crystal structure belongs to a hexagonal system, with a hexagonal layered structure. On the surface, carbon atoms are formed by SP2 hybrid orbitals σ Delocalization of bond and PZ orbital formation π The carbon spacing is 1.42 Å， There is a strong bond energy (345kj / mol) between carbon atoms, while the bond energy between carbon atoms is 16.7kj/mol and the interlayer spacing is 3.354 Å。 Graphite is soft and black gray; Greasy can pollute the paper. The hardness is 1 ~ 2 and the theoretical density is 2.26g/cm3.
There is no pure graphite in nature. Natural graphite minerals often contain SiO2, A12O3, FeO, Cao, P2O5, CuO, and other impurities.
These impurities often appear in the form of quartz, pyrite, carbonate, and other minerals. In addition, it also contains water, hydrocarbons, CO2, H2, N2, and other gases.
Therefore, the analysis of graphite, in addition to the determination of fixed carbon content, must also determine the volatile and ash content.
Basic properties of graphite
Due to its special structure, graphite has the following excellent properties:
(1) High-temperature resistance: graphite is one of the most temperature-resistant substances, and it has no melting point under atmospheric pressure. Even if it is burned by an ultra-high temperature arc, the weight loss is very small.
(2) Conductivity and heat conductivity: graphite has high conductivity and heat conductivity. The thermal conductivity decreases with the increase of temperature, and graphite even becomes insulation at a very high temperature.
(3) Lubricity: the lubrication performance of graphite depends on the size of the graphite grain and the development of the crystal. The larger the graphite grain, the more perfect the crystal development, the smaller the friction coefficient, the better the lubrication performance.
(4) Chemical stability: graphite has good chemical stability at room temperature, and can resist acid, alkali, and organic solvent corrosion.
(5) Plasticity: graphite has a certain toughness, can be processed simply, and graphite with high crystal development can even be milled into a thin sheet.
(6) Thermal shock resistance: graphite thermal expansion coefficient is very small, can withstand the temperature change without damage.
