In recent years, with the improvement of the level of vacuum valve heat
treatment furnace, vacuum heat treatment has unique advantages, and vacuum heat
treatment has won the favor of people in the industry by a series of advantages
such as degassing, degreasing, anaerobic and automation, but it is worth noting
that Vacuum heat treatment furnaces have high standards for electric heating
elements. High temperature deformation, fracture and volatilization of electric
heating elements have become important factors restricting the development of
In order to solve this problem, the industry turned its attention to "black gold" graphite. Graphite has the impeccable advantages of other metal materials. It is understood that graphite is used as an electric heating element and is almost popular in different types of vacuum heat treatment furnaces.
Graphite Heating Element
So what are the advantages of Graphite Heating Element?
①High temperature resistance: the melting point of graphite is 3850±50°C, and the boiling point is 4250°C. Even if it is burned by ultra-high temperature arc, the weight loss is small and the coefficient of thermal expansion is small. The strength of graphite is enhanced with increasing temperature, and the strength of graphite is doubled at 2000 °C.
②Conductivity, thermal conductivity: graphite is one hundred times more conductive than general non-metallic minerals. Thermal conductivity exceeds metal materials such as steel, iron, and lead. The thermal conductivity decreases with increasing temperature, and even at very high temperatures, graphite becomes a thermal insulator. Graphite is electrically conductive because each carbon atom in graphite forms only three covalent bonds with other carbon atoms, and each carbon atom still retains one free electron to transport the charge.
③Lubricity: the lubricating properties of graphite depend on the size of the graphite scale. The larger the scale, the smaller the friction coefficient and the better the lubrication performance.
④Plasticity: graphite has good toughness and can be rolled into very thin sheets.
When the vacuum furnace is designed and processed, it is necessary to consider that the resistance of the electric heating element changes little with temperature and the resistivity is stable, so graphite is the preferred material. If you have any other questions, please contact us China Graphite Electrode Factory, who can help you at any time.
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