选择性激光烧结与注塑成型尼龙6制件性能研究

Performance Study of PA6 Parts Produced by Selective Laser Sintering and Injection Molding

以经工艺优化后力学性能最佳的SLS成型件与注塑成型件作为研究对象,分析两种成型制件在表面形貌、结晶形态和热力学性能上的差异。结果表明:与SLS成型件相比,注塑成型件具有更低的表面粗糙度和更致密的微观结构;SLS制件结晶形态与原始PA6粉末相似为α态,而注塑成型件结晶形态为γ态;差示扫描量热与热重分析表明,两种成型方法对PA6制件热学性能影响较小;此外,SLS成型制件的抗拉强度比注塑成型制件高39.79%,但其断裂伸长率和断裂能仅为4.73%和1.46 MJ/mm^(3),远低于注塑成型的48.12%和15.12 MJ/mm^(3)。

Taking the SLS molded parts and injection molded parts with the best mechanical properties after process optimization as the research objects,the differences in surface morphology,crystalline morphology and thermodynamic properties of the two molded parts are analyzed.The results show that:compared with SLS molded parts,injection molded parts have lower surface roughness and denser microstructure;the crystalline form of SLS parts is similar to the original PA6 powder inαstate,while the crystalline form of injection molded parts is inγstate.Differential scanning calorimetry and thermogravimetric analysis show that the two molding methods have little effect on the thermal properties of PA6 parts;in addition,the tensile strength of SLS molded parts is 39.79%higher than that of injection molded parts,but its elongation at break The rate and fracture energy are only 4.73%and 1.46 MJ/mm^(3),which are much lower than the 48.12%and 15.12 MJ/mm^(3) of injection molding.