模具选用对湿法成形制备碳纤维增强热塑性树脂复合材料孔隙率的影响

Effect of Mold Type on Porosity of Carbon Fiber Reinforced Thermoplastic Prepared via Wet Forming Process

关键词:  湿法成形  复合材料  模具  孔隙

Key Words:wet forming process  composite materials  mold  pore

摘要:本研究探讨了2种模具（对模模具和板框模具）对湿法成形制备碳纤维增强热塑性树脂复合材料（WL-CTP）孔隙结构的影响。结果表明，使用2种模具时，模压时间对孔隙率均无影响，模压压力对孔隙率有影响。使用对模模具时，孔隙因模压压力不足导致纤维网络未充分形变而生成；使用板框模具时，孔隙因熔融的预成形体被过分挤出而生成。在碳纤维体积分数为50%，模压压力5 MPa时，相较于板框模具制备的WL-CTP的孔隙率（35%），对模模具制备的WL-CTP的孔隙率（13%）更低，对模模具更适合用于制备高纤维含量的WL-CTP。

Abstract:In this study， the effect of 2 molds （matched-die and plate-frame molds） on the pore structure of carbon fiber reinforced thermoplastic （WL-CTP） prepared via wet forming process was investigated. The results showed that the molding time had no effect on the porosity when any mold was used， while the molding pressure affected the porosity. Pores were generated by insufficient deformation of the fiber network due to insufficient molding pressure when using the matched-die mold. In the case of plate-frame mold， pores were generated due to excessive extrusion of the molten preform. At a carbon fiber volume fraction of 50% and molding pressure of 5 MPa， the porosity （13%） of WL-CTP prepared by the matched-die mold was lower than that of its plate-frame molded counterpart （35%）， therefore， the matched-die mold was more suitable for the preparation of WL-CTP with high fiber content.