Study On The Preparation And 3D Printing Experiment Of Polyetheretherketone And Its Composites

In recent years,3D printing technology has been playing an important role in biomedical,mechanical,automotive,aerospace and many other fields due to its ability to form materials into various complex parts through bottom-up and layer by layer accumulation.Among them,3D printing technology of fused deposition modeling is relatively mature,and its printer has simple structure,high degree of automation,and is not limited by shape.Polyetheretherketone(PEEK),as a high-performance semi-crystalline polymer,has attracted more and more attention from many researchers due to its excellent mechanical properties,heat resistance and biocompatibility.However,due to the high melting point and high viscosity of the PEEK materials,its own friction performance is not enough to meet the requirements of various working conditions and the application of the PEEK materials is limited.In this paper,the effects of printing temperature and printing parameters on the performance of 3D-printed PEEK samples were investigated.In order to effectively improve the comprehensive properties of PEEK materials,PEEK and its composites 3D printing filaments were successfully prepared by using Nano-Al2O3 as filling material and PEEK as matrix material with different hybrid methods.The effects of Nano-Al2O3 content and hybrid methods on the properties of PEEK composites 3D-printed samples were analyzed and the application of 3D-printed PEEK samples provides more feasibility.Aiming at the agglomeration phenomenon of nanoparticles,mechanical hybrid methods(hybrid methods 1)and the ultrasonic-assisted solution and mechanical hybrid methods(hybrid methods 2)are improved on the basis of common hybrid methods to realize the preparation of PEEK and its composites 3D printing filaments and the thermal properties of the PEEK and its composites 3D printing filaments are analyzed.At the same time,the effect of printing temperature on the mechanical properties of the PEEK samples was studied according to the thermal properties of PEEK and its composites printing filaments.The results show that the filling of different Nano-Al2O3 content does not significantly change the thermal performance of the printing filaments,and the melting temperature is about 338?.When the printing temperature is in the range of 350??390?,the mechanical properties of the 3D-printed PEEK samples are greatly improved with the increase of the printing temperature.According to the analysis of the factors that affect the surface quality of the printed samples during the forming process,the orthogonal experimental design is used to study the effect of the layer thickness,the number of outlines,the filling angle and the outline overlap on the mechanical properties of the 3D-printed PEEK samples.The results show that the layer thickness and the outline overlap have a relatively large influence on the tensile and bending properties of the PEEK samples,while the filling angle and the number of outlines have a relatively large influence on the impact properties of the PEEK samples.The single factor experiment method was used to study the influence of Nano-Al2O3 content and hybrid methods on the mechanical properties of PEEK composites.The results show that with the increase of the content of Nano-Al2O3,the tensile strength of the PEEK composites generally shows a decreasing trend,while the bending strength first decreases and then increases.When the content of Nano-Al2O3 increases,the bending strength of the printed sample decreases gradually.Under the same Nano-Al2O3 content,the mechanical properties of PEEK composites(hybrid methods 2)are improved to varying degrees compared with PEEK composites(hybrid methods 1).Based on the conclusions of the influence of printing parameters,Nano-Al2O3 content and hybrid methods on the mechanical properties of PEEK and its composites,the influence of load,forming direction,layer thickness and filling angle on the friction and wear properties of PEEK and its composites were further investigated.The effects of Nano-Al2O3 content and hybrid methods on the friction and wear properties of 3D-printed PEEK composites were analyzed by single factor experiment.The results show that the friction samples fail in 16 minutes when the load is 150N and 200N,and the friction coefficient of PEEK samples is 0.52 when the load is 50N.The results show that the friction coefficient of PEEK samples is similar under different forming conditions,the friction coefficient and wear width of PEEK samples increase with the increase of layer thickness,but decrease first and then increase with the increase of filling angles.Compared with the pure PEEK samples,the friction coefficient of the 4wt%Al2O3/PEEK(hybrid methods 1)samples is reduced by 13.5%.Under the same Nano-Al2O3 content,the friction coefficient and wear width of the PEEK composites(hybrid methods 2)are reduced to varying degrees compared with the PEEK composites(hybrid methods 1),and the friction and wear properties of the PEEK2 samples are more excellent.