臺灣博碩士論文加值系統

　　以往所使用的纖維（如玻璃，碳纖）強化樹脂（如EPOXY, BMI）之積層板，由於缺乏高溫保待能力，因而阻礙了複合材料在引擎和航太軍事等方面的應用，基於提升複合材料的耐高溫性質及拓展其抗熱性之應用領域，本研究係選用聚亞醯胺樹脂為基材，碳纖為強化材，以高溫模壓方式製成複合材料，並進行機械性質測試與SME破壞斷面分析，以瞭解其物性及破壞方式。在抗張測試方面，對於所有之試片而言，以3D-5.0的強度和破壞功為最大，在彎曲性質上，強度以5D-5.0最大，而破壞功則以5D-5.0為最高，而在層間測試方面，其抗脫層能力則以3D-5.0為最好，其次為5D-5.0>2D>3D-7.5>5D-7.5。本研究之複合材料在經過樹脂Tg點（380℃）上下，四種不同高溫約24小時處理之後，在接近Tg點之370℃時，其抗張強度與彎曲強度之有率皆高於50%，而抗張強度之保有率又比彎曲測試的好，此外不論對於抗張模數或彎曲模數而言，處理溫度雖然高達450℃，但保有率依然有50%以上，其保有率遠超過強度之保有率，由上述結果可知，聚亞醯胺樹脂確實可改善複合材料在高溫時之熱氧化安定性，顯示此樹脂確為一可應用於高溫材料之耐高溫型樹脂。

　　In the study, thermosetting polyimide resin be used as matrix, carbon fiber as reinforcement, The process of making composites by compression molding of high temperature, the physical properties and fracture mode of these composites was investigated by the test of mechanical properties and the SEM images of fracture surface.
　　In tensile tests, the strengths and rupture work ( energy ) of 3D-5.0 structure has the best value. In the flexural tests, the orders of the strengths are 3D-5.0>3D-7.5>5D-5.0>2D>5D-7.5, then the rupture work of 5D-5.0 are the most greatest.
　　The composites were treated with four different high temperature over 24hr. Both of the tensile and flexural strengths can retain over 50% of original strengths at 370℃,and the retention of tensile strengths is better than flexural strengths, since matrix sensitive of flexural tests is significant. As to shear tests, the capability of resist delamination of 3D-5.0 is the best in all sample, because of the Z-directional fibers have resistant effect of crack propagation. Besides, tensile Young's modulus and flexural modulus retain over 50% of original modulus near 450℃, so the retention of modulus is larger than the retention of strenghts at same treated temperature. As a result, Polyimide resin can to improve the thermo-oxidative stability properties of composites in high temperature, and show that Polymide resin has high heat resistant abd can be applicated on material of high temperature.