3D打印用连续纤维复合丝材分束浸渍工艺

Beam Splitting Impregnation Process of Continuous Fiber Composite Wire for 3D Printing

作为复合材料中的增强相,连续纤维在复合材料成形件受载过程中承担主要载荷。研究表明,纤维含量的提升有利于提高复合材料成形件的力学性能,然而高纤维含量复合材料在增材制造成形过程中由于树脂含量低、树脂浸渍效果差,容易出现表面质量差、层间结合能力弱等现象,严重影响成形件的成形质量与力学性能。为提高树脂浸渍程度,对比了不同纤维含量与打印温度下的尼龙(PA)12树脂/连续芳纶纤维(CAF)复合丝材及成形件的拉伸强度,针对高纤维含量CAF增强PA12复合丝材的制备提出了一种分束浸渍的工艺方法。研究结果表明,树脂浸渍不充分限制了高纤维含量复合材料的拉伸强度,对于纤维含量为57.60%的CAF增强PA12复合丝材,采用分束浸渍工艺制备的PA12/CAF复合丝材,最高拉伸强度可达1337.58 MPa,对比未采用分束浸渍工艺制备的复丝提升21%,树脂浸渍效果得到了有效提升。

As a reinforcing phase in composite materials,continuous fibers bear the main load during the loading process of composite parts.Research shows that increasing the fiber content is beneficial to improving the mechanical properties of composite parts.However,due to the low resin content and poor resin impregnation effect,high fiber content composites are prone to poor surface quality and weak interlayer bonding ability during the additive manufacturing process,which seriously affect the forming quality and mechanical properties of the composite parts.In order to improve the degree of resin impregnation,the tensile strength of continuous aramid fiber(CAF)reinforced nylon(PA)12 resin composite wires and composite parts under different fiber content and printing temperature were compared,and a beam splitting impregnation process for the preparation of high fiber content CAF reinforced PA12 composite wires was proposed.The research results show that insufficient resin impregnation limits the tensile strength of high fiber content composites.For PA12/CAF composite wires with 57.60%fiber content,the maximum tensile strength of PA12/CAF composite wires prepared using the beam splitting impregnation process can reach 1337.58 MPa,which is up to 21%higher than that of composite wires prepared without the beam splitting impregnation process.The resin impregnation effect has been effectively improved.