| Summary: | 碩士 === 國防大學理工學院 === 材料科學與工程碩士班 === 103 === The analysis of fabrication process parameters and properties of carbon fibers made from naphthalene mesophase pitch was conducted in this thesis. The naphthyl pitch containing 100% mesophase pitch was used as a raw material and extracted to form pitch fibers through a melt spinning machine. These fibers were stabilized with various parameters. The effects of process parameters on the center and the outer structure, the oxygen content, the element distribution and the properties of the stabilized pitch fibers were investigated to find optimal parameters for the stabilization process.
The stabilized pitch fibers were then carbonized and graphitized and their radial structure, crystalline patterns and related mechanical properties were evaluated to discuss the effect of process parameters and reaction mechanisms on the fiber’s properties. The results show that after stabilized at 250℃ for 8 h and carbonization or graphitization, the pitch fibers extracted at the melting temperature of 315℃ have better graphitization, heat and electric conductive and mechanical properties. The degree of graphitization of these fibers is 98.8% and their ID/IG from Ramon analysis is 0.34. These fibers also have a resistivity of 1.3 x 10-6 Ω．m, a thermal conductivity of 970 W / mK and a tensile strength of 860 MPa.
|
|---|
