OXIDE MAGNETIC MATERIAL

• Main Authors: MATSUO YOSHIO, KATO MITSUTSUGU, ONO KIYOTO
• Format: Patent
• Language: English
• Published: 29.07.2010
• Subjects: ARTIFICIAL STONE; BASIC ELECTRIC ELEMENTS; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; ELECTRICITY; INDUCTANCES; LIME, MAGNESIA; MAGNETS; METALLURGY; REFRACTORIES; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES; SLAG; TRANSFORMERS; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To provide an oxide magnetic material which has good properties, such as large high-frequency magnetic permeability similar to that of NiZn-based ferrite, and high surface resistance, and which is suitable for reduction in cost and used suitably as an alternate material for the NiZn-based ferrite. SOLUTION: A composition including 50.1-54.4 mol% of iron oxide as a main component, 3.8-20.3 mol% of manganese oxide, 10.3-25.0 mol% of zinc oxide and 5-15 mol% of copper oxide, and the balance being magnesium oxide is prepared. Zirconium oxide may be added as an additive in an amount of about 0.5 wt.% or a trace amount smaller than 0.5 wt.%. In a sintered compact thus obtained, characteristics of respective mixed materials are made to interact, and the sintered compact has such material properties that the variation rate Δμi/μiof initial magnetic permeability μiis <5% in the frequency range of 10-100 kHz and the surface resistance is ≥107[Ω]. COPYRIGHT: (C)2010,JPO&INPIT