聚醚醚酮的FDM工艺参数与结晶行为研究

采用熔融沉积成型技术(FDM)制备了聚醚醚酮(PEEK)试样,并应用试验设计(DOE)方法分析研究了打印层高、热台温度和打印速度对PEEK试样拉伸强度和结晶行为的影响。结果表明:当打印层高、热台温度和打印速度分别为0.10 mm、160℃、30 mm/s时试样的拉伸强度最大(82 MPa)。3个打印参数从试样的层间结合、缺陷与结晶行为等方面不同程度地影响着PEEK试样的拉伸强度;随着热台温度的提升,试样的结晶度提高。而在同一热台温度下,由于打印过程中存在的温度分布差异,试样存在着明显的结晶不均匀现象,从试样的中心到边缘、沿厚度增加方向,结晶度逐步降低。

Study on Process Parameters and Crystallization Behavior of Polyetheretherketone in FDM Printing

Polyetheretherketone(PEEK)samples were prepared by fused deposition modelling(FDM),and the effects of layer thickness,heat platform temperature and nozzle moving speed on the tensile strength and crystallization behavior were analyzed by using the design of experiment(DOE)method.The results showed that the maximum tensile strength(82 MPa)was obtained when the layer thickness,heat platform temperature and nozzle moving speed were 0.10 mm,160℃and 30 mm/s,respectively.The three printing parameters affect the tensile strength of PEEK samples with different degrees from the combination of layers,defect and crystallization behavior.With the increase of heat platform temperature,the crystallinity of the samples increases.In addition,at the same heat platform temperature,due to the difference of temperature distribution in printing process,there is an obvious phenomenon of uneven crystallization of the samples.From the center to the edge,along with the increase of thickness,the crystallinity of samples gradually decreases.