| dc.description.abstract | Due to the advancement of industrial technology and the improvement of the level of daily life, some electrical equipment such as electronics, motors, information and communications have increased dramatically. The high-density electromagnetic waves generated by these electrical equipment have formed a new pollution problem, including the electromagnetic radiation of electrical circuits themselves. Radiation and its reception of electromagnetic radiation from the outside world. The problems caused by these electromagnetic interferences become more and more serious as the electrical products develop towards small size, high function, low power and low potential. The general traditional electromagnetic wave interference protection measures mostly use silver, copper and other highly conductive electromagnetic shielding materials, but they have been unable to respond to the needs of light, thin and customized designs. With the introduction of laminated manufacturing technology, production has become customized And the characteristics of making complex outlines and light weight have considerable development potential. In this paper, the additive manufacturing technology (Additive Manufacturing, AM) and graphene polylactic acid material are used to analyze the Taguchi method, and the strength of the electromagnetic protection material and the electromagnetic wave shielding effect are obtained.
To sum up the above, this study used Fused Deposition Modeling (FDM) to print different conductive polylactic acid (Polylactic acid) wires. The content is divided into two parts: The first part is PLA (Conductive Graphene Filament) for 3D printing The material can get the best tensile strength within the controllable range of printing equipment. The parameters of this experimental process are the nozzle temperature, nozzle moving speed, and the thickness of the layer. The Taguchi experiment design is adopted, and the L4 orthogonal table is used for the experiment. The ANOVA variation analysis is used to find the control factors that have more significant effects.According to the experimental results, the mechanical properties are shown in the S/N reaction chart of the quality characteristic reaction table. The best combination is nozzle speed 40mm/s, nozzle temperature 240°C, and layer thickness 0.15mm. The strength of 31.88 MPa is the best value. Through the analysis of variance, the significant control factors are found. The significant control factors have the largest contribution to the intensity. The parameters include nozzle temperature and layer thickness. The results of the optimized analysis of the comparison quality characteristic response table and the optimized combination of parameters obtained by the ANOVA variation analysis are the same, which can ensure the accuracy of the experiment. The second part is the discussion of electromagnetic wave shielding effect. The measurement of aluminum foil, polylactic acid and polylactic acid containing graphene and red copper is used to compare the electromagnetic shielding effect. The transformer is measured in the frequency range of 30Hz~300Hz. When the substrate is doped with different materials and the same distance, the shielding effect is graphene>red copper>pure polylactic acid. As the thickness of the aluminum sheet increases, the shielding effect increases. Finally, put forward suggestions for possible improvements and future applications.
Keywords: Graphene, Additive Manufacturing, Fused Deposition Modeling, Taguchi method
Electromagnetic shielding | en_US |