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pitch based carbonization furnace oven kiln.jpg

High Temperature Pitch-Based Carbon Fiber Pre-Oxidation Furnace

In the production process of pitch-based carbon fiber, the carbonization furnace is located after the pre-oxidation furnace and is the core equipment for converting pre-oxidized fiber into carbon fiber.

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    Technical Parameters
    Main Functions
    Furnace Structure Type

    Main Functions

    Main Functions

    Removal of Non-Carbon Elements: High-temperature pyrolysis removes elements such as O, H, and N from pre-oxidized fibers (residual rate <1%), increasing the carbon content to 92%-99%.

    Formation of Graphite Structure: High temperatures promote rearrangement of fiber molecular chains, forming a turbostratic graphite structure, which imparts high modulus and high strength to the carbon fibers.

    Key Performance Relationships: Process control in the carbonization furnace directly affects the tensile modulus (150-900 GPa) and strength (1-7 GPa) of the carbon fibers. It is a crucial element in the development of high-modulus pitch-based carbon fibers (such as M60J grade for aerospace applications).

     

    Furnace Structure Type

    Classification by Heating Method

    Resistance Heating:

    Structure: Graphite electrodes or molybdenum wire heating elements, maximum temperature up to 3000°C, temperature control accuracy ±5°C.

    Applications: Laboratory and high-end carbon fiber (e.g., M70J grade) production.

    Induction Heating:

    Principle: An alternating magnetic field is used to heat a graphite heating element, resulting in a fast heating rate (over 100°C/min).

    Advantages: Excellent temperature uniformity (±3°C), suitable for continuous large-scale production.

    Gas Radiant Heating: Utilizes radiant heat transfer from gas combustion, achieving temperatures below 1800°C. Low cost, but poor temperature control accuracy (10°C).