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Carbon fiber powder
Pan-based carbon fiber powder is a micrometer-sized carbon material prepared from polyacrylonitrile (PAN) raw fibers through processes such as pre-oxidation, high-temperature carbonization, and grinding classification. This material has high carbon content, high electrical conductivity, excellent high-temperature resistance, and excellent chemical stability. It is widely used in composite material reinforcement, conductive fillers, friction materials, and electrode materials, etc.
In terms of the production process, the production of pan-based carbon fiber powder is divided into five key stages. The pre-treatment stage requires pre-oxidizing PAN fibers in an air environment, with the processing temperature controlled within the range of 200-300℃, forming a trapezoidal structure. The carbonization stage is carried out under inert gas protection with a gradient temperature rise, with the carbonization temperature reaching 1000-3000℃ to ensure complete graphiteification of the fiber structure. The grinding process uses an air flow pulverizer for multi-stage grinding, adjusting the rotational speed of the classifier to control the particle size within the range of 5-50μm, with a particle size distribution coefficient of ≤1.5. Surface modification treatment requires selecting different modifiers according to application scenarios, such as silane coupling agent KH550 or titanium acid ester coupling agent NDZ-201, with the modifier addition amount being 0.5-2% of the powder mass. The final product needs to be tested for quality using equipment such as laser particle size analyzer, specific surface area analyzer (BET method), and X-ray diffraction instrument (XRD).
In the application technology field, when this material is used as an reinforcing phase in polymer composite materials, adding 3-5% can increase the bending strength of epoxy resin by 40-60%. When used as a conductive filler in electronic packaging materials, the filtration threshold can be reduced to 0.8vol%, and the volume resistivity can reach 10²-10³Q·cm. In the field of friction materials, adding 15-20% carbon fiber powder can stabilize the friction coefficient of the brake pad at 0.35-0.45 and reduce the wear rate by more than 30%. In lithium-ion battery electrodes, adding 1-2% as a conductive agent can increase the electrode compactness to 3.4g/cm³ and increase the cycle life by more than 200 weeks.
Carbon content ≥ 95%, ash content ≤ 0.5%, bulk density 0.2-0.5g/cm³, specific surface area 200-500m²/g, electrical conductivity 100-1000S/cm. In terms of particle size distribution, D10 ≥ 3μm, D50 controlled within 5-15μm, D90 ≤ 30μm. For special application scenarios, customized parameter services can be provided, such as for nuclear industry products, the boron content needs to be controlled ≤ 0.1ppm, and for lithium battery products, the iron content needs to be ensured ≤ 50ppm.
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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