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Characteristics of graphite

2020-11-09 14:45

Description

Graphite is an allotrope of elemental carbon. The periphery of each carbon atom is connected with three other carbon atoms (multiple hexagons arranged in a honeycomb) covalently bonded to form a covalent molecule. Since each carbon atom emits an electron, those electrons can move freely, so graphite is an electrical conductor. Graphite is one of the softest minerals, and its uses include making pencil leads and lubricants. Carbon is a non-metallic element, Latin for Carbonium.

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Characteristics of graphite


Graphite and its products have excellent characteristics such as high-strength acid resistance, corrosion resistance, high temperature resistance of 3000℃ and low temperature resistance of -204℃, and are widely used in metallurgy, chemical industry, petrochemical industry, high energy physics, aerospace, electronics, etc. The specific characteristics of graphite are roughly as follows:


1. Super high temperature resistance


The melting point of graphite is 3850±50°C and the boiling point is 4250°C. Even if burned by ultra-high temperature arc, the weight loss is very small, and the thermal expansion coefficient is also very small. The strength of graphite increases with the increase of temperature. At 2000°C, the strength of graphite doubles.


2. Graphite products have good thermal conductivity and thermal shock resistance. Graphite can withstand drastic changes in temperature without being damaged when used at room temperature. When the temperature changes suddenly, the volume of graphite will not change much and no cracks will occur.


3. Graphite products have chemical stability and corrosion resistance. Graphite has good chemical stability at room temperature and is not corroded by any strong acid, strong alkali and organic solvent.


4. Graphite products are environmentally friendly and healthy, no radioactive pollution, and high temperature resistance. Carbon can become graphite after at least a dozen days and nights of graphitization in a high temperature environment of 2000-3300 degrees. Therefore, the toxic and harmful substances in graphite have long been released, and it is very stable at least within 2000 degrees.


5. Graphite products have good adsorption properties. The interstitial structure of carbon makes carbon have good adsorption properties, so carbon is often used as an adsorption material to adsorb moisture, odor, toxic substances, etc.