Graphite powder can be used as a pencil, so why can graphite powder be used as a pencil? Do you know? Read it with the editor!
First of all, graphite powder is soft and easy to cut, and graphite powder is also lubricious and easy to write; As for why 2B pencil should be used in the college entrance examination, its conductivity should be used. Secondly, in terms of chemical properties, graphite powder is composed of C element, and the chemical properties of C element are relatively stable at room temperature, so using graphite powder pencil to record files can save a long time.
Graphite powder has the following special properties due to its special structure:
1) High-temperature resistance: Graphite powder has a melting point of 3850 50℃ and a boiling point of 4250℃. Even if it is burned by ultra-high temperature arc, its weight loss and thermal expansion coefficient are very small. The strength of graphite powder increases with the increase of temperature, and the strength of graphite powder doubles at 2000℃.
2) Conductivity and thermal conductivity: The conductivity of graphite powder is one hundred times higher than that of general nonmetallic ores. Thermal conductivity exceeds that of metal materials such as steel, iron and lead. The thermal conductivity decreases with the increase of temperature, and even at extremely high temperature, graphite powder becomes an insulator. Graphite powder can conduct electricity because each carbon atom in graphite powder only forms three covalent bonds with other carbon atoms, and each carbon atom still retains one free electron to transfer charge.
3) Lubricity: The lubricating property of graphite powder depends on the size of graphite powder scales. The bigger the scales, the smaller the friction coefficient and the better the lubricating property.
4) Chemical stability: Graphite powder has good chemical stability at room temperature, and can resist acid, alkali and organic solvent corrosion.
5) Plasticity: Graphite powder has good toughness and can be ground into thin slices.
6) Thermal shock resistance: Graphite powder can withstand the drastic change of temperature at room temperature without being damaged. When the temperature changes abruptly, the volume of graphite powder does not change much and cracks will not occur.
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Post time: Nov-22-2022