Impregnation property across carbon fiber stacks under vacuum pressure

Impregnation behavior of fluids across the unidirectional weave stacks in the transverse direction of fibers under vacuum pressure was investigated elementally by using self-designed tools, and parameters of the operational method were standardized by a series of experiments. The impregnation properties of distilled water, phenol aldehyde solution, and glycerol in carbon fiber weave stacks were studied by changing the vacuum pressures. The results show that the impregnation velocity of fluids improves with increasing the vacuum pressure applied. Under the same vacuum pressure, the impregnation velocity of the distilled water is the fastest. The impregnation velocity of the glycerol is faster than that of the phenol aldehyde solution at 5 kPa and 20 kPa vacuum pressure, while the phenol aldehyde solution is faster than the glycerol at 40 kPa and 60 kPa.