DEVELOPMENT OF ELECTROMAGNETIC SHIELDING MATERIALS TO PROTECT THE OBSTACLE OF ELECTROMAGNETIC WAVE IN ELECTRIC INFORMATION GOODS AND CONFIRMATION OF FORMING PROCESS TECHNOLOGY

在本研究中，首先利用微波等离子体在平板玻璃上涂覆ITO薄膜。当线间隔、线宽和线的形态发生变化时，测量了ITO薄膜的电磁波屏蔽效能。随着线段间距的减小，电磁波屏蔽效果有所提高，但线段加工成线形后，屏蔽效果不受线段宽度的影响。当线路形式改为网格形式时，影响屏蔽效果的主要因素不是网格形式，而是线路间距。然后，将ITO膜层合成三层，考察了ITO膜层序对电磁波屏蔽效果的影响。电磁波屏蔽效能随ITO膜层数的增加而增加。在相同数量的三层薄膜的情况下，ITO膜对电磁波的屏蔽效果得到了改善，ITO膜相互接触的时间比隔离的时间长。认为电磁波产生的高频电流随地面迅速流动，提高了对电磁波的屏蔽效果。采用微波水热法制备了碳纤维表面的铁氧体和镍铁氧体。x射线衍射和扫描电镜证实了这一点。包覆后的碳纤维与纸浆和粘结剂混合后，加工成座状。碳纤维的结合率分别为40%和80%。测试了座形纸对电磁波的屏蔽效果。随着碳纤维含量的增加，对电磁波的屏蔽效果有所提高，而对铁氧体和镍铁氧体涂层板的屏蔽效果变差。在400MHz频率下，屏蔽效能为负。这种负屏蔽效应是由于电磁波产生的高频电流使碳纤维作为天线工作并发射电磁波而发生的现象。少

In this study, an ITO film was coated first by using the microwave plasma on the plate glass. When a line interval, line width and the form of the line were changed, and then the electromagnetic wave shielding effectiveness of ITO film was measured. Electromagnetic wave shielding effectiveness improved with decreasing the interval of the line but it wasn't influenced by the line width when it was processed into the line-shaped. When the form of the line was changed to mesh-shaped, the electromagnetic wave shielding effectiveness was affected by rather the line interval than the form of mesh. Next, the ITO films were laminated three layers, and it was examined about the influence of layer order of an ITO film on electromagnetic wave shielding effectiveness. Electromagnetic wave shielding effectiveness increased as the numbers of the layers of an ITO film increased. An ITO film improved effect on electromagnetic wave shielding even in the case of the three sheets of same number of the la … More yers when as ITO film touched each other rather than for isolated the layer. It is considered that effect on electromagnetic wave shielding was improved because the high frequency electric current, which was occurred by an eletromagnetic wave is flown promptly with the ground. It was succeeded that ferrite and nickel ferrite were coated on the surface of carbon fiber by the microwave hydrothermal process. This was confirmed by the X-ray diffraction and SEM. After the covered carbon fiber was mixed with the pulp and the binder, and it was processed into the seat-shaped. The combination rate of carbon fiber was changed with 40% and 80%. Effect on electromagnetic wave shielding of the seats-shaped paper was measured. Effect on electromagnetic wave shielding is improved with increasing the content of carbon fiber, and that effectiveness for ferrite and nickel ferrite coated sheet became too bad. Moreover, there was negative shielding effectiveness under the frequency of 400MHz. This negative shielding effectiveness is the phenomenon which happens because the high frequency electric current which was occurred by the electromagnetic wave make operate carbon fiber as an antenna and the electromagnetic wave is emitted. Less