Effect of Spinning Process on the Oriented Structure and Thermal Conductivity of the Mesophase Pitch-based Graphite Fiber

doi:10.3724/SP.J.1077.2010.00989

Abstract

Abstract:

High thermal conductive mesophase pitch-based graphite fiber was prepared through melt spinning, stabilization, carbonization and graphitization. It was proved that the spinning process was crucial for the degree of preferred orientation of mesophase molecular along the fiber axis. Effect of spinneret structure with rectangular section and spinning temperature on the preferred orientation degree and conductivity properties of MPGF were investigated. The experimental results demonstrate that larger aspect ratio of spinneret section facilitate higher preferred orientation degree of molecular and conductivity. At 9:1 of the aspect ratio and 305℃ of spinning temperature, the orientation degree of graphite crystal with respect to fiber axis and thermal conductivity of MPGF reached 97.8% and 894 W/(m·K), respectively. Furthermore, the mesophase pitch still?exhibite good spinnability. With increasing the aspect ratio of rectangular section of spinneret, larger shear action leads to higher internal stress of fiber, and resultes in poor spinning stability.

Key words: mesophas pitch-based carbon fiber, oriented structure, thermal conductivity

CLC Number:

TB332

MA Zhao-Kun, LIU Lang, LIU Jie. Effect of Spinning Process on the Oriented Structure and Thermal Conductivity of the Mesophase Pitch-based Graphite Fiber[J]. Journal of Inorganic Materials, 2010, 25(9): 989-993.

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