The Manufacture, Physical, Conductivity and Microstructure of Stabilized PAN Fiber Felt Mixed with Carbon Black Reinforced Phenolic Resin Carbon/Carbon Composites

• Main Authors: Wen-Teng Han, 韓文騰
• Other Authors: Tse-Hao Ko
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/ghy37e

碩士 === 逢甲大學 === 材料科學所 === 91 === Carbon/Carbon composites were prepared from carbon black (CB), oxidized PAN felt and resol-type phenol-formaldehyde resin. The composites were heat-treated at 230℃, 400℃, 600℃, 800℃, 1000℃, 1800℃ and 2500℃, respectively. The effect of pyrolysis and different weight percent of CB on the microstructure, and physical properties, and electric conductivity of the composites during the heat-treatment process was studied. In the base physical properties of composites, as the CB increasing, the weight loss, shrinkage and the open pore of composites having an obvious improvement during pyrolysis, the density of composites were also increasing. After compounding with oxidized PAN felt, the composites did not have obvious changes in these tests and all the properties would be linear relationship with the oxidized PAN felt, approximately. A large increase (239.9%) in flexural strength at 2500℃ demonstrates that CB could strengthen the composites and have a substantial potential as reinforcement. After compounding with oxidized PAN felt, the interface graphitization cause the interface strength of oxidized PAN felt to decrease, so the composites lose the strength. In conductivity and microstructure, CB composites experience an increase in electric conductivity with an increase in CB weight percent. After compounding with oxidized PAN felt, the properties have an obvious improvement with pure resin in electric (41.32% at 2500℃). Similar to conductivity, as the CB increasing, the CB will make the composites graphitized, so the Lc and La of composites will also increase. Consider of the benefits/cost ratio, the results indicate that a suitable CB concentration of composite was 10 wt% .