本實驗針對快速碳化的碳/碳複合材料進行表面處理，來增進碳/碳複合材料的密封性。此外，在預浸與含浸的過程中，使用酚醛樹脂與煤塔瀝青做為碳前驅體，探討此類碳/碳複合材料的密度、孔隙率、機械性質等。並評估此類碳/碳複合材料應用於熱交換器的可行性。
由實驗結果顯示，碳/碳複合材料的表面處理可大幅提高碳/碳複合材料的密封性，並提高碳/碳複合材料的韌性，唯有密度、機械強度略為下降，孔隙率略為增加。酚醛樹脂基材的碳/碳複合材料具有較高的機械強度，呈現脆性的破斷面；煤塔瀝青基材的碳/碳複合材料具有較高的韌性，呈現延性的破斷面。
綜合實驗結果發現，預浸材與含浸材使用酚醛樹脂的碳/碳複合材料具有最高的機械強度，經過表面處理的碳/碳複合材料均可通過Flinak的密封性測試，極具應用於熱交換器的潛力。

In this study, hermetic properties of carbon/carbon composites fabricated by fast-carbonization with surface treatment on the carbon/carbon composites have been promoted. Besides, the properties of carbon/carbon composites by processing in pre-preg and impregnation with phenolic resin and coal-tar pitch as carbon precursors are investigated, such as density, porosity, and flexural strength. Moreover, the purpose of this study is to evalute the potential of the carbon / carbon composites to apply the heat exchanger tube.
The results indicate that carbon/carbon composites with surface treatment could largely promote the hermetic properties and possess higher toughness than without surface treatment. However, density and flexural strength properties are slightly decreasing. Resin-based carbon/carbon composites show higher flexural strength and brittle fracture surface. Pitch-based carbon/carbon composites show higher toughness and ductility fracture surface.
Consequently, carbon/carbon composites with pre-preg of resin and impregnation of resin show the highest flexural strength, and carbon/carbon composites with surface treatment can pass the hermetic test in Flinak. It shows the potential to apply heat exchanger tube.

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