Geomagnetic Shielding Property and Mechanism of Fe-Ni Laminated Composite

doi:10.1007/s40195-014-0145-0

Abstract

Abstract:

Ni layers were deposited on the two sides of pure Fe substrate by using electroplating to form Ni/Fe/Ni diffusion couple. After diffusion heat treatment, Fe-Ni laminated composite was obtained with Fe-Ni alloy/Fe/Fe-Ni alloy structure. The results indicate that the Fe-Ni layers combine well with the substrate and the Fe-Ni/Fe interface presents an interlocking microstructure with small-size grains. The concentration of element Ni in the Fe-Ni layer decreases from surface to interior exhibiting a gradient distribution. Geomagnetic shielding factor (SF) of Fe-Ni laminated composite can reach as high as 22.6, which is about seven times of that of pure Fe substrate. Mathematical equation of SF for laminated structure was derived according to magnetic circuit and resistance theory. The theoretical expression reveals that parameters such as the thickness and magnetic permeability of the shield material play an important role in the magnetic shielding behavior and the theoretical calculation results of SF coincide well with our experimental values.

Key words: Fe-Ni laminated composite, Initial permeability, Magnetic shield, Shielding factor

Ma Xiangyu, Zhang Qiang, Chen Xiang, Wu Gaohui. Geomagnetic Shielding Property and Mechanism of Fe-Ni Laminated Composite[J]. Acta Metallurgica Sinica (English Letters), 2014, 27(5): 918-923.

Figures/Tables 9

Fig. 1 Schematic showing OM specimens preparation and metallographic morphology of Fe-Ni laminated composite: a, c Cross section; b, d oblique section

Fig. 2 Ni element distribution in the surface layer of Fe-Ni/Fe/Fe-Ni laminated composite

Fig. 3 XRD pattern of Fe-Ni laminated composite on cross section

Fig. 4 Geomagnetic shielding factor of different structures and cooling conditions

Fig. 5 Initial permeability of Fe-Ni alloy under different cooling conditions [3]

Fig. 6 Schematic diagram of magnetic shielding and equivalent magnetic circuit

Fig. 7 Divided Fe-Ni alloy layers and initial permeability of each layer

Table 1 Thickness and initial permeability of each layer in Fe-Ni laminated composite and Fe substrate

Shield layer	Thickness (μm)	Initial permeability μ _i
Shield layer	Thickness (μm)	Furnace cooling	Air cooling
Fe substrate	500	50	50
Fe-Ni/Fe/Fe-Ni
Ni₇₅layer (70-80%)	8	1.5 &#X000D7; 10³	8 &#X000D7; 10³
Ni₆₀layer (50-70%)	6	1.5 &#X000D7; 10³	3.5 &#X000D7; 10³
Ni₃₅layer (25-50%)	6	2.0 &#X000D7; 10³	2.0 &#X000D7; 10³
Ni₁₅layer (0-25%)	5	100	100
Pure Fe	450	150	150

Table 2 Computed and measured values of SF

Shield layer	Computed SF	Measured SF
Fe substrate	3.5	3.3
Fe-Ni/Fe/Fe-Ni
Furnace cooling	14.5	9.7
Air cooling	27.3	22.6

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