uhp graphite electrode rp

Pubdate: 08-30 2021

How much do you know about the basic structure, properties, classification and characteristics of graphite?

The crystal structure of graphite Graphite is a substance composed of a single carbon element. The crystal structure belongs to the hexagonal crystal system with a hexagonal layered structure. The σ bond formed by the sp2 hybrid orbital and the delocalized π bond formed by the Pz orbital of the carbon atoms on the layer combine to form a firm hexagonal grid-like plane. The carbon-carbon atom spacing is 1.42?, and the carbon atoms have extremely strong The bond energy of carbon atoms (345KJ/mol), and the weak van der Waals force between the planes of carbon atoms (the bond energy is 16.7KJ/mol), and the inter-layer spacing is 3.354?. Graphite is soft and dark gray; it has a greasy feel and can stain 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 impurities such as SiO2, A12O3, FeO, CaO, P2O5, and CuO. These impurities often appear in the form of minerals such as quartz, pyrite, and carbonate. In addition, it also contains water, hydrocarbons, CO2, H2, N2 and other gases. Therefore, in the analysis of graphite, in addition to determining the fixed carbon content, the volatile and ash content must also be determined at the same time.

The 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 materials. It has no melting point under normal pressure. Even if burned by ultra-high temperature arc, the weight loss is very small.

(2) Electrical and thermal conductivity: Graphite has high electrical and thermal conductivity. Thermal conductivity decreases with increasing temperature, and graphite even becomes an insulator at extremely high temperatures.

(3) Lubricity: The lubricating performance of graphite depends on the size of graphite grains and the degree of crystal development. The larger the graphite grains, the more perfect the crystal development, the smaller the friction coefficient, and the better the lubricating performance.

(4) Chemical stability: Graphite has good chemical stability at room temperature, and is resistant to acids, alkalis and organic solvents.

(5) Plasticity: Graphite has a certain degree of toughness and can be processed by simple mechanical processing. Graphite with a high degree of crystal development can even be ground into very thin flakes.

(6) Thermal shock resistance: The thermal expansion coefficient of graphite is very small, and it can withstand drastic changes in temperature during use without damage. Classification and characteristics of graphite Graphite can be divided into natural graphite and artificial graphite. Both have similar structures and the same physical and chemical properties, but their uses are quite different.

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