Influence of Low-temperature Heat-treatment on the Structure and Properties of Fe@Ag Composite Particles

doi:10.3724/SP.J.1077.2010.01180

Abstract

Abstract: In order to reduce the resistivity of Fe@Ag composite particles, the influence of heat-treatment temperature (T) on the structure, resistivity and magnetic properties of the Fe@Ag composite particles, and the shielding effectiveness (SE) of the electromagnetic shielding rubber containing the Fe@Ag composite particles were studied. The results show that with heat-treatment temperature increasing from 120℃ to 170℃, the Fe@Ag composite particles heat-treacted at 140℃ have the most compact silver-shells and the lowest volume resistivity, while the saturation magnetization almost keeps unchanged. The electromagnetic shielding rubber containing the Fe@Ag composite particles heat-treated at 140℃ has SE of -28 dB to -53 dB, which is -10 dB to -15 dB higher than that of the particles without heat-treatment. The morphology evolution and related property changes with T are reasonably explained by the interface wetting theory and crystal growth theory. Low-temperature heat-treatment provides a simple and convenient approach to obtain electromagnetic shielding fillers with high performance.

Key words: core-shell structure, low-temperature heat treatment, electric property, shielding effectiveness

CLC Number:

TQ13

ZHAO Su-Ling, CHEN Jing, WANG Yi-Long, SUN Zhi-Gang, GUAN Jian-Guo. Influence of Low-temperature Heat-treatment on the Structure and Properties of Fe@Ag Composite Particles[J]. Journal of Inorganic Materials, 2010, 25(11): 1180-1184.

References

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