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Influence of Machining on Magnetic Properties of Soft Magnetic Composites
Igarashi Kazunori,Miyahara Masahisa,Morimoto Koichiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Influences of machining on magnetic properties of soft magnetic composites (SMC's) with addition of two kinds of binder, i.e., organic binder and inorganic one, were investigated. Machining does not affect DC magnetic properties of the SMC compacts. This can be ascribed to their particular structure in which the ironpowder particles are highly isolated by the binder. On the other hand, decrease in resistivity and resultant increase in eddy current loss was confirmed in the machined compacts containing inorganic binder. It is supposed that the brittleadditive binder existing between the iron particles is partly broken, and iron-to-iron contact is formed on the machined surface.
Acupressure Bead in the Eustachian Tube
Yu Matsumoto,Kazunori Igarashi,Akinobu Kakigi 사단법인약침학회 2015 Journal of Acupuncture & Meridian Studies Vol.8 No.4
In this article, we aim to enlighten practitioners and patients involved with acupressure beads and to contribute to their safer use by reporting a unique case of insidious intrusion of an acupressure bead into the eustachian tube. A metallic object was found in the eustachian tube of a patient while conducting a magnetic resonance imaging (MRI) examination. The object was later confirmed to be an auricular acupressure bead, and was successfully removed by performing a tympanoplasty and a canal wall down mastoidectomy. The bead was assumed to have passed through an existing perforation of the tympanic membrane. According to previously published literature, tympanic membrane perforations exist in ∼1% of the population. Therefore, middle-ear foreign bodies are relatively common occurrences for otolaryngologists. However, metallic objects such as acupressure beads are especially important in the sense that they can cause severe burns during MRI. To avoid potential complications, acupressure-bead practitioners should be aware of the possibility that intrusions through the tympanic membrane could go unnoticed.
High-strength Soft Magnetic Composite with Self-lubricating Resin
Miyahara Masahisa,Tanaka Yoshihiro,Igarashi Kazunori,Morimoto Koichiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Improvement of the strength is one of the most important subjects on soft magnetic composite (SMC) to increase the applica ble items. In this study, lubricants for inner lubricating SMC, which can be produced in lower cost than die wall-lubricatin g SMC, varied to investigate their effect on the strength. The newly developed SMC with self-lubricating resin shows high st rength equivalent to that of SMC obtained by die wall lubrication.
Properties of Soft Magnetic Composite with Evaporated MgO Insulation Coating for Low Iron Loss
Uozumi Gakuji,Watanabe Muneaki,Nakayama Rryoji,Igarashi Kazunori,Morimoto Koichiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Innovative SMC with low iron loss was made from iron powders with evaporated MgO insulation coating. The coating had greater heat-resistance than conventional phosphatic insulation coating, which enabled stress relieving annealing at higher temperature. Magnetic properties of toroidal samples (OD35mm,ID25mm, t5) were examined. The iron loss at 50Hz for Bm = 1.5T was lower 50% of conventional SMC and was almost the same with silicon iron laminations(t0.35). It became clear that MgO insulation coating has enough heat resistance and adhesiveness to powdersurface to obtain innovative SMC with low iron loss.