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The defense date of the thesis is 2017-09-13
The current date is 2019-04-24
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URN etd-0913117-100123 Statistics This thesis had been viewed 234 times. Download 0 times. Author Xiang-yu Chen Author's Email Address No Public. Department Materials Engineering Year 2016 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 108 Title The influence of high temperature heat treatment on the structure and properties of PAN-based carbon fibers Keyword carbon fiber heat treatment heat treatment carbon fiber Abstract T300 polyacrylonitrile(PAN)-based carbon fibers were used in this study to investigate the effects of desizing and heat treatment temperature (1000~ 2800 ºC) on the structure, mechanical and electrical properties. A simple self-made manual fixture was designed to preserve the cross-section of the fiber after tensile failure for the observation of the fracture surface morphology.
The tensile test results show the tensile strength of the carbon fiber decreases after desizing. The tensile strength of the carbon fiber increases after 1000 ºC heat treatment, and starts to decrease after 1200 ºC. The tensile modulus increases with the heat treatment temperature continuously. In addition, The modulus increases as the fiber elongates. The electrical test results show the carbon fiber resistivity decreases from 18.1 μΩm to 7.5 μΩ m and the average diameter reduces from 7.26 μm to 6.57 μm after 2800 ºC heat treatment. The results of structural analysis show that the d002 value decreases more rapidly for the temperature range of 1200 ~ 1600 ºC, and then the rate of decrease lowers. On the other hand, the stacking size(Lc) of graphene layers grows continuously after 1400 ºC. Observation of surface morphology after 2800 ºC indicates that the depth of surface striation reduces and that the surface becomes rougher when the heat treatment temperature is greater then 2000 ºC. Observation of tensile fracture surfaces show that the initiation of failure starts from the surface defects or the surface points with high stress concentration.
Advisor Committee Shinn-Shyong Tzeng - advisor
Files Date of Defense 2017-07-31 Date of Submission 2017-09-13