A comprehensive study on controlling the porosity of CCF300/PEEK composites by optimizing the impregnation parameters

Abstract

In order to manufacture excellent CCF300/PEEK composites, a comprehensive study on controlling porosity of CCF300/PEEK composites was investigated by optimizing the impregnation parameters. Four kinds of PEEK with different melting flow rates (MFR) were employed to study on their rheology behavior and reveal the processing characteristics. The results showed that the viscous flow of PEEK has a higher dependence on the processing pressure than temperature. Furthermore, PEEK rheology behavior was employed to assist the optimization of impregnation parameters. PEEK powders were coated on both sides of single layer CCF300 by a preheating process, and then the semi‐impregnated forms were stacked layer by layer to manufacture CCF300/PEEK composites. An optimized impregnation prediction model was established and verified, showing a pretty effective prediction about pressure and holding time at a certain temperature to control the porosity and achieve the full impregnation. Afterwards, the well‐impregnated CCF300/PEEK composites were evaluated by their compressive performance, flexural performance and interlaminar shear performance, showing good interfacial and interlaminar bonding to resist the propagation of cracks. POLYM. COMPOS., 39:3765–3779, 2018. © 2017 Society of Plastics Engineers

Effect of poly(ether ether ketone) degradation on commingled fabrics consolidation

“…The Figure 7 shows the effect of pressure and consolidation time on the void ratio of the NCF1 and NCF2 plates. Increasing the consolidation pressure decreases the void ratio, which is in agreement with a Darcy's Law description [2,24], but all configurations led to a the void ratio above 10 %, even when using pressures up to 50 bars.…”

Effect of PEEK degradation on commingled fabrics consolidation

“…Moreover, when repeating tests in the same conditions or in increasing time or pressure, the same behavior is obtained. Increasing pressure decreases the void ratio, as shown by different authors this phenomenon is described by the Darcy's Law [1,18], but it still remains above 10%, even when using pressures up to 50 bars.…”

Effect of polyetherimide sizing on surface properties of carbon fiber and interfacial strength of carbon fiber/polyetheretherketone composites

“…The PEEK powder was dried in an oven at 120°C (2 hours), then they were coated on upper and lower sides of single layer CF fabrics by a preheat process 33 . The weight ratio of fiber to resin was controlled at 4:3.…”

“…The PEEK powder was dried in an oven at 120 C (2 hours), then they were coated on upper and lower sides of single layer CF fabrics by a preheat process. 33 The weight ratio of fiber to resin was controlled at 4:3. Then CF/PEEK laminates with the thickness of 2 mm were prepared by laminating seven layers of prepreg sheets, and they were manufactured under vacuum at 400 C with compression pressure of 1~7 MPa.…”