Graphite cylinder Best For You

Graphite cylinders have particularly good self-lubricating properties, and the friction coefficient is quite large. When graphite and metal are rubbed against each other, the friction coefficient is 0.04-0.05, and the wear rate is not large. Graphite has a high thermal conductivity coefficient [80-180Cal/ (mh℃)] and conductivity (5×10-4-60×10-4Ω.cm), it has reducibility below 3000℃, its stability is very high in neutral medium, and the linear expansion coefficient is very low. It is the most widely used material in the friction pair of rotary joints.


 Characteristics of the processing technology of the graphite cylinder:


 1) 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) Electrical and thermal conductivity: The electrical conductivity of graphite is one hundred times higher than that of general non-metallic minerals. The thermal conductivity exceeds that of metal materials such as steel, iron, and lead. Thermal conductivity decreases with increasing temperature, even at extremely high temperatures, graphite becomes an insulator. Graphite can conduct electricity because each carbon atom in graphite only forms 3 covalent bonds with other carbon atoms, and each carbon atom still retains 1 free electron to transfer charge.


 3) Lubricity: The lubricating performance of graphite depends on the size of the graphite flakes. The larger the flakes, 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 good toughness and can be rolled into very thin flakes.


 6) 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.

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