材料词典 - G

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高性能石墨填充塑料拥有极高的结构稳定性和良好的摩擦性质,适用于通过喷射模塑或热压工艺大批量生产精密部件。

Coke and pitch are mixed and molded into form.

See also: Elektrographite

Graphite has been employed in chemical process equipment engineering for more than 70 years. In this sector, its applications are determined in the first place by its chemical and physical properties and in the second place by its suitability as a construction material for equipment and pressure vessels.

Production process for semi-finished graphite products

The production process for graphite requires an extensive amount of time and energy.

Mixing and forming

The raw materials (low-iron petroleum cokes and pitch binders) are mixed at a moderate temperature, forming a homogeneous compound. Forming by ram extrusion

Continuous process

  • Forming into solid material or tubes
  • Forming by vibration molding

Discontinuous process

  • Graphite properties non-directional (isotropy)
  • Forming by isostatic pressing
  • Baking, impregnation and rebaking.

The baking process converts the binder pitch to coke, removes most of the volatiles at 1200°C, and leaves a solid, non-deformable carbon body (amorphous carbon). Baking is followed by pitch impregnation and subsequent rebaking to improve density and other properties.

Graphitization

This production step heats the carbon material to a temperature of approx. 3000°C by electricity, inducing the formation of the crystalline graphite structure. Synthetic resin impregnation by a vacuum-pressure process fills the pores within the graphite, making the material impermeable.