摘要:
The invention provides surface-treated reduced iron powder from which a powder magnetic core can be produced so that the powder magnetic core has small core loss and small frequency-dependence of the core loss and exhibits small core loss even when driven at high frequencies of 1 MHz or more. The surface-treated reduced iron powder is obtained by at least surface-treating reduced iron powder prepared by a reduction and slow oxidation method, and contains secondary particles formed through agglomeration of primary particles, the primary particles having an average particle diameter of 0.01-5 μm. The secondary particles have a D90% particle diameter of 20 μm or less, the surface of the primary particles is at least in part coated with an insulating layer containing iron phosphate, and the phosphorus content is 500-10000 ppm.
摘要:
The present invention provides a powder magnetic core low in the loss and high in the saturation magnetic flux density and a method for manufacturing the same. More specifically, the present invention provides a powder magnetic core that comprises a soft magnetic metal powder having an average particle size (D50) of 0.5 to 5 μm, a half width of diffraction peak in a direction of α-Fe as measured by X-ray powder diffraction of 0.2 to 5.0°, and an Fe content of 97.0% by mass or more, the core having an oxygen content of 2.0% by mass or more.
摘要:
A magnetic material for antennas including: an M-type hexagonal ferrite represented by the following general formula (1) as a main phase, MA.Fe12-x.MBx.O19 (wherein MA is at least one kind selected from the group consisting of Sr and Ba, MB is MC or MD, MC is at least one kind selected from the group consisting of Al, Cr, Sc and In, MD is an equivalent mixture of at least one kind selected from the group consisting of Ti, Sn and Zr and at least one kind selected from the group consisting of Ni, Zn, Mn, Mg, Cu and Co, X is a number from 1 to 5), and an average crystal particle diameter is equal to or greater than 5 μm.
摘要:
Firing is carried out such that for operation of a partial pressure of oxygen and temperature at the high-temperature holding operation phase and cooling operation phase, the following equilibrium relation equation (1) indicative of an equilibrium relation of a partial pressure of oxygen (PO2 in %) to a temperature (T in absolute temperature K) is used to set the values of a and b at given values of a=a* and b=b*, respectively, Log(PO2)=a−b/T Eq. (1) and Log(PO2)=a*−b*/T that is a basic relation equation for operation of the partial pressure oxygen (PO2) and temperature (T) is fixed as an basic equation for operation; the partial pressure of oxygen (PO2) at the high-temperature holding operation phase is operated at a partial pressure of oxygen p2 that is higher than the value of an equilibrium partial pressure of oxygen PO2=p1 determined from an equilibrium relation to temperature based on the basic equation for operation Log(PO2)=a*−b*/T: p2>p1; and the partial pressure of oxygen (PO2) at the cooling operation phase is operated at an equilibrium partial pressure of oxygen determined from an equilibrium relation to temperature based on the basic equation Log(PO2)=a*−b*/T. It is thus possible to obtain a MnZn-base ferrite having well-balanced properties: high saturation flux density and low core loss.
摘要翻译:进行烧结,使得在高温保持运转阶段和冷却运转阶段运行氧气和温度的运转,指示氧分压(PO)的平衡关系的以下平衡关系式(1) 使用%)至温度(绝对温度T下的T)用于将a和b的值分别设定为a = a *和b = b *的给定值< -line-formula description =“In-line Formulas”end =“lead”?> Log(PO&lt; 2&gt;)= ab / T Eq。 (1)<?in-line-formula description =“In-line Formulas”end =“tail”?>和Log(PO 2 SUB>)= a * -b * / T, 用于操作分压氧(PO 2 2)和温度(T)的关系式被定为操作的基本方程; 在高温保持操作阶段的氧气分压(PO 2 H 2)在氧气p 2的分压下操作,其比氧的平衡分压值PO p 1,从与温度的平衡关系确定的> 2 SUB> = p 1。 并且在冷却操作阶段的氧气分压(PO 2 H 2)基于从基本方程Log(PO 2)的平衡关系确定的氧平衡分压 SUB>)= a * -b * / T。 因此,可以获得具有良好平衡特性的MnZn基铁氧体:高饱和磁通密度和低磁芯损耗。