Special Property of Graphite

Detailed analysis of morphological characteristics and special properties of graphite

Graphite is soft, dark gray; greasy feeling, can contaminate the paper. Hardness of 1 to 2, with the impurities in the vertical direction can be increased to increase the hardness of 3 to 5. Specific gravity of 1.9 to 2.3. Concentrated in specific surface area range 1-20m2 / g, cut off oxygen under the conditions above the melting point of graphite 3000 , is one of the most temperature resistant mineral. It conductivity, thermal conductivity. Pure graphite in nature is not, which often contain SiO2, Al2O3, FeO, CaO, P2O5, CuO and other impurities. These impurities often appear with quartz, pyrite, carbonate and other minerals form. In addition, water, bitumen, CO2, H2, CH4, N2 and other gases parts. Therefore, the analysis of graphite, in addition to determination of fixed carbon content, it must also determine the content of volatile matter and ash at the same time.

Due to its special structure of graphite, graphite has the following special properties:

1) high temperature type: a melting point of graphite is 3850 50 , boiling point of 4250 , even UHT arc burning, weight loss is very small, the thermal expansion coefficient is small. Graphite strength with temperature increase and strengthen, at 2000 , the graphite strength doubled.

2) electrical conductivity, thermal conductivity: graphite conductivity higher than the average non-metallic minerals a hundredfold. Heat conductivity than steel, iron, lead, a metal material. The thermal conductivity decreases with increasing temperature, even at very high temperatures, a heat insulator of graphite. Graphite can be conductive because the graphite and other carbon atoms, each carbon atom only three covalent bonds are formed, each of the carbon atoms is retained to a free-electron charge transfer.

3) lubrication: lubrication performance depends on the size of the graphite flake graphite, the scales greater the smaller the coefficient of friction, lubrication, the better the performance.

4) Chemical stability: at room temperature, the graphite has good chemical stability, acid resistance, alkali resistance and corrosion resistance to organic solvents.

5) plasticity: graphite toughness, can be crushed into very thin slices.

6) Thermal shock resistance: When graphite used at room temperature can withstand dramatic changes in temperature without damage to live, when sudden changes in temperature, little change in the volume of graphite, will not crack.

WanXin Graphite Products Co., Ltd
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