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

保护电子信息商品电磁波障碍的电磁屏蔽材料开发及成型工艺技术确认

基本信息

批准号：
10555033
负责人：
MURAKAMI Ri-ichi
金额：
$ 2.75万
依托单位：
The University of Tokushima
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

项目摘要

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

在本研究中，首先利用微波等离子体在平板玻璃上涂覆ITO膜。当改变一条线的间隔、线宽和线的形状时，然后测量ITO膜的电磁波屏蔽效能。当加工成线形后，电磁波屏蔽效能随线间距的减小而提高，但不受线宽的影响。当线的形状改为网格状时，电磁波屏蔽效能的影响与线的间距有关，而与网格形状无关。接着，将ITO膜层压三层，并且研究ITO膜的层顺序对电磁波屏蔽效果的影响。电磁波屏蔽效果随着ITO膜的层数的增加而增加。ITO膜即使在三片相同数量的衬底的情况下也提高了对电磁波的屏蔽效果。 ...更多信息当ITO膜彼此接触时，而不是作为隔离层。据认为，由于电磁波产生的高频电流与地面迅速流动，提高了电磁波屏蔽效果。采用微波水热法成功地在碳纤维表面包覆了铁氧体和镍铁氧体。X射线衍射和扫描电镜证实了这一点。包覆后的碳纤维与浆料、粘结剂混合，加工成座状。碳纤维的结合率变化为40%和80%。测量了座形纸的电磁波屏蔽效果。随着碳纤维含量的增加，复合材料的电磁波屏蔽效果有所提高，但铁氧体和镍铁氧体涂层的电磁波屏蔽效果较差。此外，在400MHz频率下，屏蔽效能为负。这种负屏蔽效能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