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PAN-based carbon fiber powder is a micron-scale carbon material derived from polyacrylonitrile (PAN) precursor fibers through a series of processes including pre-oxidation, high-temperature carbonization, and pulverization. This material exhibits exceptional characteristics such as high carbon content, superior electrical conductivity, excellent thermal resistance, and remarkable chemical stability, making it widely applicable in composite reinforcement, conductive fillers, friction materials, and electrode materials.
The manufacturing process of PAN-based carbon fiber powder comprises five critical stages. In the pre-treatment phase, PAN fibers undergo pre-oxidation in an air environment at controlled temperatures ranging from 200-300°C to form a ladder-like structure. The carbonization stage involves gradient heating under inert gas protection, with temperatures reaching 1000-3000°C to ensure complete graphitization of the fiber structure. The pulverization process utilizes an air jet mill for multi-stage grinding, with particle size controlled within 5-50μm by adjusting the classifier wheel speed, achieving a particle size distribution coefficient of ≤1.5. Surface modification employs various coupling agents such as silane KH550 or titanate NDZ-201, with addition quantities ranging from 0.5-2% of the powder mass. Final product quality is verified using laser particle size analyzers, BET surface area analyzers, and X-ray diffraction (XRD) equipment.
In application technologies, this material demonstrates significant performance enhancements across various fields. As a reinforcing phase in polymer composites, a 3-5% addition can increase epoxy resin flexural strength by 40-60%. When utilized as a conductive filler in electronic packaging materials, the percolation threshold can be reduced to 0.8vol%, with volume resistivity reaching 10²-10³Ω·cm. In friction materials, incorporating 15-20% carbon fiber powder maintains brake pad friction coefficients within 0.35-0.45 while reducing wear rates by over 30%. For lithium-ion battery electrodes, adding 1-2% as a conductive agent increases electrode compaction density to 3.4g/cm³ and extends cycle life by over 200 cycles.
The material specifications include: carbon content ≥95%, ash content ≤0.5%, tap density 0.2-0.5g/cm³, specific surface area 200-500m²/g, and electrical conductivity 100-1000S/cm. Particle size distribution parameters are: D10≥3μm, D50 controlled within 5-15μm, and D90≤30μm. Customized parameter services are available for specialized applications, such as boron content control ≤0.1ppm for nuclear industry products and iron content ≤50ppm for lithium battery applications.
品名 | 碳纤维粉 |
拉伸强度 | ≥3500 |
密度 | 1.75 |
单丝直径 | 7 |
含碳量 | ≥95 |
电阻率 | 1.5×10³ |
线膨胀系数 | -0.1×10 |
长径比 | 2:1-8:1 |
细度（目数） | 30-1000 |
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