连续碳纤维增强聚苯硫醚复合材料的3D打印及力学性能优化

3D Printing and Mechanical Properties Optimization of Continuous Carbon Fiber Reinforced Polyphenylene Sulfide Composites

采用连续碳纤维增强聚苯硫醚(CCF/PPS)预浸丝材为原料,通过3D打印制备出不同工艺参数条件下的弯曲试样和层间试样。采用扫描电镜、显微CT、差示扫描量热仪、弯曲性能和层间性能等测试方法对3D打印CCF/PPS复合材料的结构和性能进行了研究。结果表明,打印制品相邻打印层之间的界面、相邻打印线条之间的界面、孔隙结构和结晶结构都对打印制品的弯曲性能和层间性能有重要影响。当打印层厚为0.2 mm、沉积空间为0.40 mm~2,并采用后热处理时,打印制品可获得最高为699 MPa的弯曲强度和43.32 MPa的层间剪切强度,在连续纤维增强热塑性复合材料3D打印研究领域处于领先水平。

Continuous carbon fiber reinforced polyphenylene sulfide(CCF/PPS)prepreg filament was used as raw material,and flexural properties specimens and interlayer properties specimens were prepared by 3D printing under different process parameters.The structure and properties of 3D-printed CCF/PPS composites were studied by scanning electron microscopy(SEM),micro-CT,differential scanning calorimeter(DSC),flexural properties test and interlaminar shear strength test.It turns out that the interface between adjacent printed layers and lines,pore structure and crystalline structure have great impact on the mechanical properties of printed products.When the layer thickness is 0.2 mm,the deposition space is 0.4 mm~2,and the post-heat treatment is adopted,the printed products can obtain the maximum flexural strength of 699 MPa and the interlaminar shear strength of 43.32 MPa,which has reached the leading level among the research field of 3D printing of continuous fiber reinforced thermoplastic composites.