The composite films of amorphous and nanocrystalline Fe73.5Cu1Nb3Si13.5B9 powders/butyl rubber were prepared by pressing in the mold to shape. The piezomagnetic properties of composite films were studied in the temperature range of 20-50 Celsius degree with theshielding properties in the frequency band (30kHz-6000MHz) of electromagnetic wave. The results show that when the microstress below 0.09MPa and testing frequency below 200kHz, the piezomagnetic properties are the best and theirs piezomagnetic properties increase as temperatures increase, the piezomagnetic properties of amorphous composite films are the best at 40 Celsius degree. Within frequency band (30kHz-6000MHz) of electromagnetic wave, the films have good characteristics of shielding high-frequency and broad-frequency electromagnetic waves. The shielding properties are improved significantly as the content of powder or the thickness of materials increases. Shielding effectiveness above 15dB is obtained at certain experimental parameters.
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机译:非晶态和纳米晶态的Fe 73.5 sub> Cu 1 sub> Nb 3 sub> Si 13.5 sub> B 9 sub>的复合膜通过将模具压制成型来制备粉末/丁基橡胶。研究了复合薄膜在20〜50摄氏度温度范围内的压电性能,并在电磁波频带(30kHz〜6000MHz)内进行了屏蔽。结果表明,当微应力低于0.09MPa且测试频率低于200kHz时,压电性能最佳,并且随着温度的升高其压电性能增加,非晶复合膜的压电性能在40摄氏度时最佳。在电磁波的频带(30kHz-6000MHz)内,这些膜具有良好的屏蔽高频和宽频电磁波的特性。随着粉末含量或材料厚度的增加,屏蔽性能得到显着改善。在某些实验参数下可获得15dB以上的屏蔽效果。
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