How to Choose The Temperature of High Temperature Graphitization Furnace According to The Processed Material?
Release time:
2025-08-13
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Abstract
High temperature graphitization furnace is an indispensable equipment in material science and industrial production, widely used in carbon fiber, graphite products, battery materials and other fields. The correct choice of graphitization temperature is crucial to product quality and performance. This article will provide you with a detailed introduction on how to choose the right high temperature graphitization furnace temperature according to different processing materials.
First, the basic principle of high-temperature graphitization furnace
High-temperature graphitization furnace through high-temperature heating (usually 2000-3000 ℃) so that the amorphous carbon in the carbon material is converted into graphite crystal structure, thereby improving the electrical conductivity, thermal conductivity and mechanical strength of the material. Temperature selection directly affects the final properties of the material.
Second, Optimum graphitization temperature of common materials
1. Carbon fiber materials
PAN-based carbon fiber: 2500-3000°C
Pitch-based carbon fiber: 2800-3200 ℃
Viscose-based carbon fiber: 2400-2800°C
2. Graphite products
Artificial graphite electrode: 2800-3200°C
Isostatic graphite: 2500-3000°C
Expanded graphite: 2200-2800°C
3. Battery materials
Negative electrode materials (artificial graphite): 2800-3200°C
Silicon-carbon composite material: 2200-2800°C
Hard carbon materials: 2000-2500℃
4. Specialty materials
Diamond film: 1800-2200℃
Carbon nanotubes: 2500-3000 ℃
Graphene: 2800-3200°C
Third, the key factors of temperature selection
Material type: different carbon source materials require different temperatures to achieve complete graphitization
Target performance: different performance indexes such as electrical conductivity, strength, thermal conductivity, etc. require different temperatures.
Process route: precursor treatment, pre-carbonization and other pre-processes affect the final graphitization temperature
Equipment capacity: Consider the temperature limit of furnace structure, heating element and insulation material.
Economy: balancing product quality and energy costs
Fourth, the temperature control skills
Step heating: to avoid the material thermal stress is too large leading to cracking
Holding time: high-temperature section of the appropriate extension of the holding time to ensure full graphitization
Atmosphere control: inert gas protection to prevent material oxidation
Temperature uniformity: to ensure that the temperature difference in the furnace is less than 50 ℃.
Fifth, Frequently Asked Questions
Q: The higher the temperature, the better the graphitization must be?
A: Not necessarily. Exceeding the optimum temperature range for the material may result in increased lattice defects or loss of material by evaporation.
Q: How to judge whether graphitization is sufficient?
A: It can be evaluated by means of graphitization degree (d002 value) measured by X-ray diffraction (XRD), resistivity test, and so on.
Q: What is the difference between the temperature setting of small experimental furnace and industrial furnace?
A: Industrial furnaces require appropriate adjustments to the heating rate and holding time due to large thermal inertia, but the target temperature range is basically the same.
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Zhuzhou Chi Carbon Automation Equipment Co., Ltd
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