- 學位論文
奈米黏土與碳管對環氧基碳纖維複合材料磨潤與熱傳導性能影響研究
Study on Tribological and Thermal Conduction Performance of Clay/CNT/Epoxy Carbon Fiber Nanocomposites
摘要
隨著科技迅速發展下，單一特性的材料已經無法滿足實際應用的多元化所需，對於材料性能多樣性的需求越來越高，具備特殊性質的高分子奈米複合材料，已成為材料研究中熱門的領域之一，在現代與未來的應用上將會日益廣泛。 本研究藉由真空輔助塑料轉注法，以多層碳纖維、奈米黏土以及奈米碳管，在環氧樹脂為高分子基底下，製備出高分子奈米複合材料試片，藉由碳纖維的高強度以及高導熱性，並搭配奈米黏土與奈米碳管優異的強度與磨潤性質，有效強化材料之機械性質與耐磨性能，最後使用雷射雕刻機加工出表面花樣。在實驗上，除了將進行機械性質的硬度試驗、電性測試、拉伸試驗、熱傳導量測，探討其硬度、電阻、應力、應變、熱傳導係數外，並使用直立試磨耗試驗機在試片上進行滑動運動，以潤滑脂作為潤滑劑，模擬高分子奈米複合材料在往復運動過程所承之磨損以及磨耗。 實驗結果顯示出在添加一定重量比的奈米黏土與碳管下，均勻份散至高分子基底中，可以有效地增強環氧樹脂的機械性質與磨潤性能，在奈米碳管5wt%及碳管2wt%的添加量下有著最佳的性能，機械性質方面可以提升48%的硬度值；提升32.3%的導電性能；16%的熱傳導性能；52%的抗拉強度，磨潤性能方面可以降低20.6%的摩擦力；表面花樣在槽寬50 µm、間距150 µm、槽深25 µm、面積百分比在24.8%的參數下有著最低的摩擦力。
並列摘要
With the rapid development of technology, the material with single characteristic has been unable to meet the demand of diversified applications in practical. On the contrary, the variety of a composite’s functions is highly required nowadays. Thus, Nanocomposites on particular properties has become one of the popular issues among material research and will be extensively applied in the near future. In this study, test specimens of Nanocomposites were produced through Vacuum Assisted Resin Transfer Molding , VARTM. By using Epoxy as substrate, test specimens of Nanocomposites were made up of multiple layers of carbon fibers , clay and carbon nanotube. The carbon fibers are featured in high strength and high thermal conductive. Also, the clay and the carbon nanotube have outstanding nature of strength and tribology. Therefore, the combination of this three materials can efficiently strengthen the mechanical property and the friction of Nanocomposites. And then, laser engraving was used to process the pattern on the test specimens of Nanocomposites’ surface. To explore the hardness , electric resistance , stress , strain and thermal conductivity coefficient of Nanocomposites, various experiments were conducted in this study, including mechanical hardness test、conductivity、tensile test and thermal conduction. Additionally, in order to simulate the wear of Nanocomposites under reciprocating motion, the test specimens were installed on a vertical abrasion tester and forced to conduct sliding motion with lubricant of lubricating grease. The experiments have indicated that the mechanical and tribology properties of Epoxy can be elevated by combining clay and carbon nanotube with the substrate under certain weight ratio. With optimized amount of additives, physical properties of the material, including hardness, conductivity, thermal conductivity, tensile strength and tribology have increased by 48 %, 32.3 %, 16 %, 52 % and 20.6 %, respectively. The pattern on the surface had the lowest friction when the width, length, depth and percentage of square measure at the level of 50 µm, 150 µm, 25 µm, 24.8 respectively.