The change in the thermal expansion coefficient of the CFC in both temperature segments is caused by the further carbonization of the carbon fiber and the graphitization of the matrix carbon, respectively.

It shows that the thermal expansion coefficient of the xy direction of the CFC is greatly influenced by the tissue structure of the carbon fiber.

The z-direction of the CFC is greatly affected by the changes in the tissue structure of the matrix carbon. It mainly reflects the change law of matrix carbon.

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