焼結Fe-Ni合金の磁気特性について

概要

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A study was made about magnetic properties of sintered materials produced from water-atomized iron-nickel alloy powder containing various silicon and nickel content.(1) Magnetic properties of sintered 45% Ni-Fe alloys depend upon silicon composition. The more silicon contents, the higher magnetic properties. But 45% Ni-Fe alloy powder containing high silicon has low compressability and therefore 45% Ni-Fe alloy powder containing about 1% silicon is the best for practical use. If they are sintered at 1200°C for 2 hours in vacuum, the maximum permeability becomes 20, 000 and the coecive force 0.29 Oe respectively.(2) Magnetic properties of sintered 45% Ni-Fe alloys are improved if they are sintered in hydrogen gas flow.(3) Sintered 47.5% Ni-Fe alloys have the highest magnetic properties such as μm is 23, 000 and Hc is 0.25 Oe, among the sintered Fe-Ni alloys cotaining 42 up to 52% nickel.
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