Carbon fiber is a new fiber material has many advantages in one, its mechanical performance is outstanding, in addition, carbon fiber is widely used in weight structure, help realize the lightweight, unlike metals, electrochemical active carbon fiber is low, with excellent corrosion resistant ability. In terms of thermal properties, carbon fiber material has a high working temperature and a small coefficient of thermal expansion. What is the thermal expansion coefficient?
First, we introduce the concept of coefficient of thermal expansion, it refers to an object caused by the change of temperature phenomenon. The coefficient of thermal expansion can be divided into linear expansion coefficient, surface expansion coefficient and expansion coefficient, and generally refers to the linear expansion coefficient, linear expansion coefficient refers to solid when heated any line width thickness or diameter. The thermal expansion coefficient of carbon fiber composites is also different according to different models. The thermal expansion coefficient of T300 carbon fiber (20 C -70 C) is -0.74× and 10-5/K.
The thermal expansion coefficient of carbon fiber is less than that of metal, so what is the advantage of small thermal expansion coefficient? The thermal expansion coefficient of carbon fiber is small, which means that the material with the same thermal expansion coefficient will receive the same heat. The carbon fiber is not easy to deform and expand, and it can keep the original shape of the object under the condition of large temperature difference. Therefore, carbon fibers play an important role in some structural parts with high operating precision.
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