Carbon fiber is an inorganic polymer fiber with a carbon content higher than 90%. The carbon content of which is higher than 99% of the said graphite fiber. The microstructure of carbon fiber is similar to that of man-made graphite, which is the structure of layered graphite.
The spacing between each layer of carbon fiber is about 3.39 to 3.42A, each carbon atom at the parallel level is not as structured as graphite, and the layers are connected by van der Waals force. The structure of carbon fiber is usually considered to be composed of two-dimensional ordered crystals and holes, in which the content, size and distribution of the pores have a great effect on the properties of carbon fibers.
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