Carbon Fiber

Carbon Fiber

Carbon Fiber Filimants go into makeing Carbon Fiber Tubes.

Each Carbon Fiber is made out of long, thin filaments of carbon sometimes transferred to graphite. A common method of making carbon filaments is the oxidation and thermal pyrolysis of polyacrylonitrile (PAN), a polymer based on acrylonitrile used in the creation of synthetic materials.

Like all polymers, polyacrylonitrile molecules are long chains, which are aligned in the process of drawing continuous filaments. When heated in the correct conditions, these chains bond side-to-side (ladder polymers), forming narrow graphene sheets which eventually merge to form a single, jelly roll-shaped or round filament.

The result is usually 93–95% carbon. Lower-quality fiber can be manufactured using pitch or rayon as the precursor instead of PAN.

The carbon can become further enhanced, as high modulus, or high strength carbon, by heat treatment processes.Carbon heated in the range of 1500–2000 C (carbonization) exhibits the highest tensile strength (820,000 psi or 5,650 MPa or 5,650 N/mm), while carbon fiber heated from 2500 to 3000 C (graphitizing) exhibits a higher modulus of elasticity (77,000,000 psi or 531 GPa or 531 kN/mm).

These fibers can be supplied in a tow (which is a yarn of fibers numbering in the thousands), braidid, woven cloth, or in a randomly laid up cloth.

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