Magnetic Properties of Atomized Iron Powder Compacts for Magnetic Cores

Nishida, Tokuhiko; Kikuchi, Tsuyoshi; Sato, Takashi; Ichiyama, Tadashi

doi:10.2320/jinstmet1952.42.6_593

Cited by 4 publications

(2 citation statements)

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“…From the above results, the differences on the saturation flux density can be greatly affected by the grain size distribution. It is assumed that the saturation flux density increases by the rate of large grains in general [9], however it is suggested that the grain size distribution have large effects on the saturation flux density in this study.…”

Section: Magnetic Propertiesmentioning

confidence: 81%

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Kato

Ono

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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Two kinds of NiCuZn ferrites were prepared through the multilayer process using doctor blade method and the conventional dry pressing method. These have a difference only in a molding process, relationship of the bulk density and the sintering temperature showed almost the same tendency. However, these had large differences in microstructure. The mechanical properties and the magnetic properties of these ferrites were investigated, the results show that the mechanical properties depend on pore sizes and that the magnetic properties depend on grain size distribution.

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Section: Magnetic Propertiesmentioning

confidence: 81%

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Kato

Ono

Matsuo

2009

Trans. Mat. Res. Soc. Japan

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“…Water atomized pure iron powder is considered to form a large amount of inclusions in the iron powder particles during water atomization due to the contact between the hot molten steel and water. 14) As future work, the contribution of these fine inclusions to coercive force should be investigated by microstructural observation by transmission electron microscopy (TEM).…”

Section: Resultsmentioning

confidence: 99%

Quantitative Analysis of Factors Increasing Coercive Force of Iron Powder Cores-Influence of Porosity

Takashita¹,

Ozaki

2021

Mater. Trans.

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Effects of Oxide Particles inside Iron Powders on Hardness and Coercivity of Soft Magnetic Composite Cores

Nishi

Aono

Okamoto

et al. 2016

J. Jpn. Soc. Powder Powder Metallurgy

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Soft magnetic composite (SMC) cores, produced by compacting insulated iron powders, are expected to improve the efficiency of motors and boost converters. Low-cost water atomized iron powders are used as raw materials for SMC cores. Since the water atomized iron powders containing a large amount of oxygen impurity, there is a problem that the magnetic properties of the SMC cores are deteriorated due to oxygen impurity. First, green compacts were made by several kinds of water atomized iron powders in which oxygen content levels are different, then were annealed in vacuum. It was found that the coercivity and the hardness of these compacts were proportional to the oxygen concentration in iron powders. By TEM observation of the compacts, it was confirmed that there were very fine oxide particles smaller than 10 nm in inside of the iron powders, and that the number density of oxide particle increase with increase in oxygen concentration. From a correlation between coercivity and particle number density, it was predicted that the existence of ultrafine oxide particles caused the increase in coercivity. KEY WORDSsoft magnetic composite, iron powder, water atomization, oxide particle, vickers hardness, coercivity 3 1,2)

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Magnetic Properties of Atomized Iron Powder Compacts for Magnetic Cores

Cited by 4 publications

References 0 publications

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Relationship between Magnetic Properties and Microstructures of Multilayer Ferrite

Quantitative Analysis of Factors Increasing Coercive Force of Iron Powder Cores-Influence of Porosity

Effects of Oxide Particles inside Iron Powders on Hardness and Coercivity of Soft Magnetic Composite Cores

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