| Summary: | 碩士 === 國防大學理工學院 === 材料科學與工程碩士班 === 102 === Fabrication of mesophase pitch precursor using the mixture of domestic C360 petroleum pitch and synthetic naphthalene mesophase pitch AR from Japan Mitsubishi Co. was studied. The blends were prepared from different C360/(AR+C360) ratio ranging from 20 to 80%. The heat-treatment process to develop the mesophase precursor was manipulated under normal atmosphere pressure with the nitrogen flow with the rate of 300 sccm, the raising rate of 3℃min-1 and the heating temperature of 400℃ for 2 hr. The structure and the carbon yield were evaluated.
In addition, grated synthetic naphthalene mesophase pitch (AR) was used as a raw material and filtered through 200 mesh sieve to mix with N-methyl pyrrolidone by sonication. After standing for 24 hr, we used the intermediate layer of the slurry to fabricate carbon-based films. The viscosity and film-forming properties of the mixture added with pure solvent or the solvent containing different weight ratio of polymethylmethacrylate (PMMA) were studied. A proper fabrication process to prepare carbon-based films was achieved through the thermal weight loss and resistance analysis.
The effects of additives species, their content and the carbonization and graphitization temperatures on the carbon-based films prepared from the slurry prepared by the aforementioned process was evaluated. The cross-sectional morphology, thickness and resistance of the prepared films were observed and measured with scanning electron microscope (SEM) and 4-point probe tester. The thermal conductivities (κ) of the prepared films were calculated from the measured conductivities. We hoped to prepare a carbon-based film with a better thermal conductivity via the optimization of the process parameters. The result shows that a carbon-based film with the resistance of 0.14 Ω/sq and the thermal conductivity of 69.13 W/m．K can be achieved by adding 5 wt% nano boron powders into the slurry and graphitizing the film at 2300℃.
|
|---|
