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Electromagnetic properties of phosphate-coated ferrite composite materials

机译：磷酸盐涂层铁氧体复合材料的电磁性能

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摘要

Sintered ferrite was treated with phosphoric acids to form phosphate-coated powders. The formation of the coating layer was verified by the improvement of oxidation resistance, microscopic morphologies, and evident reduction of conductivity of the powders. The coated powders were then blended with silicone to fabricate composite materials. The electromagnetic properties of the composites at the frequency range of 1 MHz to 1 GHz were investigated and found to be noticeably affected by the surface condition of the powders. The coating layer significantly reduced the imaginary part of permittivity of the composite owing to the improvement of insulation, while the resonance frequency was scarcely affected. The magnetization curves revealed that, compared to the composite containing as-prepared powder, the coated powder filled composites exhibited enhanced demagnetizing field, which consequently contributed to an obvious depression in magnetic permeability. Due to the modification of electromagnetic properties, the phosphate-coated ferrite composites were found to be practical materials as a substrate of radio frequency identification (RFID) metal tag. The impedance measurement results revealed that the phosphate-coated ferrite composites could remedy destructive interference imposed by metal and was beneficial for fabrication of RFID metal tag.
机译：用磷酸处理烧结的铁氧体以形成磷酸盐涂层的粉末。通过提高抗氧化性，微观形貌和明显降低粉末的电导率来验证涂层的形成。然后将涂覆的粉末与硅氧烷混合以制造复合材料。研究了复合材料在1 MHz至1 GHz频率范围内的电磁性能，并受粉末表面状况的明显影响。由于绝缘性的改善，涂层显着降低了复合材料的介电常数的虚部，而几乎不影响共振频率。磁化曲线表明，与包含所制备粉末的复合材料相比，涂覆粉末的填充复合材料显示出增强的退磁场，因此导致磁导率明显降低。由于电磁性能的改变，磷酸盐涂层的铁氧体复合材料被认为是实用的材料，可作为射频识别（RFID）金属标签的基材。阻抗测量结果表明，磷酸盐涂层的铁氧体复合材料可以纠正金属施加的破坏性干扰，有利于RFID金属标签的制造。

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  • 来源
    《Journal of materials science》 |2012年第11期|1944-1949|共6页
  • 作者

    J.-Y. Hsu; S.-K. Kuo; Y.-H. Hung;

  • 作者单位

    New Materials Research and Development Department, China Steel Corporation, Kaohsiung 81233, Taiwan;

    Iron and Steel Research and Development Department, China Steel Corporation, Kaohsiung 81233, Taiwan;

    New Materials Research and Development Department, China Steel Corporation, Kaohsiung 81233, Taiwan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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