나노 카본블랙 / 섬유강화 복합재료의 전자파 차폐 효과에 관한 연구

Abstract

It has been increased greatly environmental pollutions such as air , water, noise pollutions as make rapid progress of industialization. This environmental pollution can be confirmed through an eye, a nose, an ear. But the electromagnetic waves called the fourth of pollution can not see and hear so that there are some serious problem. Recently, it has been largely gone up the concern about how the electromagnetic waves emitted from electronic products and various phones affects a human body such as EMI( electromagnetic interference), EMS( electromagnetic susceptibility), EMC( electromagnetic compatibility). the necessity of material development that can absorb and shield the electromagnetic waves has been demanding. The metal is the great material as a electromagnetic waves shield because the electric conductivity is high, but there are disadvantages with a material that the cost is expensive and the weight is heavy. Great fiber reinforced composites with specific rigidity, specific strength, bending, lightweight are being used mainly as housing materials of electronic equipment. However it can be protected from the electromagnetic interference. Composites filled with a high molecular substance almost have no electromagnetic shielding effectiveness because of an insulator electrically. Fiber reinforced composites in order to shield the electromagnetic have been researched mechanical methods to use the filler mixed such as metal powder, carbon black which the electric conductivity is high. Therefore, in this paper, we has analyzed the variation of mechanical properties through tensile experiments and characteristics on electromagnetic shielding effectiveness at the frequency range of 300MHz and 1GHz to manufacture Aluminium sandwich panel made a core material using conductive metal fabric and fiber reinforced composites mixed metal powders and carbon black. We carried out electromagnetic shielding experiments of GFRP, CFRP filled with at regular weight rate metal powder of Ti, Ni, Mg and carbon black. When an additive does not add, we analyzed characteristics of electromagnetic shielding effectiveness to perform electromagnetic shielding experiments of GFRP and CFRP. Also, we tried to perfrom tensile experiments to consider mechanical characteristic variations with an amount of additives. Other, we brought to effect electromagnetic shielding experiments to turn out sandwich panel made of the outer plate A1050 to use Ni-Cu textile fiber as a core material and analyzed characteristics of electromagnetic shielding effectiveness to perform electromagnetic shielding experiments about A1050 panel of same thickness and carried out tensile experiments to consider mechanical character variations at each condition. Finally, we carried out an analysis to use Moldflow( MPI5.0) program for analyzing injection molding on Muticap cover product which emitted much electromagnetic. Using trial and error to solve problems and poor products under the injection molding process can not be corresponded effectively about quality improvement, reduction of the due date, cost and also can be declined about searching cause and solution. In this part, not only obtaining the optimum design to analyze all of the problems predicted before manufacturing really mold is low-cost, but also has the original purpose to settle for finding the cause of problems. In this paper, we investigated flow characteristic such as fill pattern, the optimum gate location, etc to carry out injection molding analysis and analyzed to predict short shot, weldlines.