Carbon fiber is a common improved composite material with excellent heat resistance, high compressive strength, large modulus of elasticity, and lightweight. It is generally made by using organic chemical fiber precursors for anti-aging treatment, followed by one-dimensional processing. Such carbon fibers have high compressive strength but are not yet a complete graphite structure. They need further processing in a protective atmosphere at 2800°C-3000°C to improve structural uniformity. Let's discuss the five steps in the production of carbon fiber in detail.

1. Fiber drawing. Fiber drawing can be done in three ways: wet, dry, or molten.

2. Yarn separation. The yarn separation temperature is around 100°C~300°C. The amount of carbon fiber is important in this process.

3. Pre-oxidation. The pre-oxidation temperature is 400°C, which causes hydrogen bonds to form within the molecular structure, improving heat resistance.

4. Carbonization. Carbonization requires a higher temperature, between 1000°C and 2000°C, to remove other impurities from the fiber and increase the oxygen content. This is generally carried out in a rare gas atmosphere.

5. Graphitization. Graphitization requires an even higher temperature, around 2000°C to 3000°C, to further remove impurities from the fiber and transform it into a more stable structure.