Manager Hao (pre oxygenation thread): 13831164999
Manager Shi (pre oxygenation wire): 17332928150
Manager Gu (Pre oxygenation Silk): 13833138900
Manager Zhao (woven fabric, pre impregnated fabric, prefabricated body): 15028196018
Manager Zhang (woven fabric, axial fabric): 13703314888
Manager Zhao (Composite Products): 13944687090
Manager Steve Duan:15704489366
Address: 226 Shifu East Road, Gaocheng District, Shijiazhuang City, Hebei Province
Pre-oxidized fiber is primarily classified based on the type of precursor filament (the raw material for carbon fiber production) and the degree of pre-oxidation (the key technical index that determines the quality of the final carbon fiber). These two classification bases cover both material attributes and process characteristics, which are highly applicable to industrial B2B scenarios. Below is a detailed breakdown:
The precursor filament is the core raw material for pre-oxidized fiber, and its type directly determines the performance, application scope, and production process of the final carbon fiber. This is the most widely used classification method in industrial production.
Precursor source: Made from polyacrylonitrile (PAN) filaments, which account for over 90% of global carbon fiber precursor output.
Core characteristics: Undergoes obvious cyclization, dehydrogenation, and oxidation cross-linking reactions during pre-oxidation; the resulting fiber has a uniform structure, high carbon yield (50–60%), and excellent mechanical properties after carbonization.
Process features: Pre-oxidation is carried out in air atmosphere, with temperature divided into three stages (200–220°C → 220–250°C → 250–280°C), and tension control is critical to ensure fiber orientation.
Application direction: The corresponding carbon fiber is used in general industrial fields (wind turbine blades, new energy vehicle parts) and high-end aerospace fields (aircraft structural parts).
Precursor source: Made from mesophase pitch or isotropic pitch filaments (byproducts of petroleum refining or coal tar processing).
Core characteristics: The precursor has a liquid crystalline structure; pre-oxidation mainly suppresses the fusion of pitch molecules during high-temperature carbonization, and the resulting fiber has ultra-high modulus but relatively low tensile strength.
Process features: Pre-oxidation is often carried out in an inert atmosphere (nitrogen) to avoid excessive oxidation of the pitch structure; the temperature is slightly lower (180–250°C) than that of PAN-based pre-oxidation.
Application direction: The corresponding carbon fiber is used in high-stiffness scenarios (satellite antenna supports, precision instrument frames).
Precursor source: Made from regenerated cellulose filaments (rayon), the earliest precursor used for carbon fiber production.
Core characteristics: Low carbon yield (only 20–30%) after carbonization; the fiber has good high-temperature resistance but poor mechanical properties.
Process features: Pre-oxidation requires a longer heating time (to remove more non-carbon elements) and lower tension to prevent fiber breakage.
Application direction: The corresponding carbon fiber is limited to high-temperature insulation scenarios (industrial furnace linings, fire-resistant fabrics) and has been gradually replaced by PAN-based carbon fiber in structural applications.
The degree of pre-oxidation is a core technical index to evaluate the quality of pre-oxidized fiber, which is determined by parameters such as pre-oxidation temperature, time, and atmosphere. This classification is mainly used for in-process quality control in industrial production lines.
Definition: The precursor filaments do not undergo sufficient cyclization and cross-linking reactions due to low pre-oxidation temperature, short time, or insufficient oxygen supply.
Characteristics: The fiber still retains partial thermoplasticity; during subsequent carbonization, it is prone to melting, sticking, and even breaking, resulting in carbon fiber with low strength and high porosity.
Industrial performance: The fiber has low density (less than 1.3 g/cm³) and low oxygen content (less than 8%), and is usually treated as a defective product.
Definition: The precursor undergoes complete cyclization, dehydrogenation, and cross-linking reactions under optimized pre-oxidation parameters.
Characteristics: The fiber is completely transformed into a thermoset structure, with stable density (1.3–1.4 g/cm³) and oxygen content (10–15%); during carbonization, it can maintain a continuous filament shape, and the final carbon fiber has high strength and modulus.
Industrial performance: This is the standard pre-oxidized fiber for industrial production, which meets the quality requirements of carbon fiber manufacturing.
Definition: The fiber undergoes excessive oxidation reactions due to too high pre-oxidation temperature, too long time, or excessive oxygen supply.
Characteristics: The fiber surface is severely oxidized, with excessive oxygen content (more than 18%); the internal structure becomes brittle, and during carbonization, it is prone to microcracks, resulting in carbon fiber with low elongation and poor fatigue resistance.
Industrial performance: The fiber has high density (more than 1.4 g/cm³) and is also a defective product that cannot be used for high-performance carbon fiber production.
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Ltd. All rights reserved.
Manager Hao (Pre-oxidized Fiber): 13831164999,hjh@hbtangu.com
Manager Shi (Pre-oxidized Fiber): 17332928150,sj@hbtangu.com
Manager Gu (Pre-oxidized Fiber): 13833138900
Manager Zhao (Woven Cloth, Prepreg Cloth, Preform): 15028196018,zb@hbtangu.com
Manager Zhang (Woven Cloth, Axial Cloth): 13703314888
Manager Zhao (Composite Products): 13944687090, zqy@hbtangu.com
Manager Steve Duan:15704489366,245140980@qq.com
Email: 245140980@qq.com
Address: No. 226, East Shifu Road, Gaocheng District, Shijiazhuang City, Hebei Province
