Electrical properties of iron powder-based composites encapsulated by the oxide coating

A. Vetcher, A. Galyas, G. Govor, K. Yanushkevich
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Abstract

The electrical characteristics of composite materials based on iron powders ASC 100.29 (Sweden) were investigated. The surface of powders is encapsulated by an insulating ferrite coating. The conductivity and the thermopower were studied, the cores were made by the pressing method, and then the samples were cut from the cores. The results show that the decrease in the electrical resistance with increasing temperature is due to a change in the contact between the grains in the sample. A change in the boundaries between grains (or domains) creates the conditions for formation of a new magnon, which affects the thermopower coefficient value. The research results can be used in the synthesis of composites with specified electromagnetic characteristics for practical applications.
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氧化包覆铁粉基复合材料的电学性能
研究了基于ASC 100.29(瑞典)铁粉的复合材料的电学特性。粉末的表面包裹着一层绝缘的铁氧体涂层。研究了该材料的电导率和热性能,采用压制法制备了芯,然后从芯上切割样品。结果表明,电阻随温度升高而降低是由于试样中晶粒之间的接触发生了变化。晶粒(或畴)边界的变化为新磁振子的形成创造了条件,从而影响热功率系数值。研究结果可用于合成具有特定电磁特性的复合材料,具有实际应用价值。
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