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MnZn-BASED FERRITE SINTERED BODY

A sintered body and ferrite technology, applied in the direction of magnetic objects, iron compounds, inductors/transformers/magnets, etc., can solve the problems of increased core loss, large changes over time, increased magnetic anisotropy, etc., to achieve Effect of low core loss and small change over time

Active Publication Date: 2019-11-22
HITACHI METALS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This MnZn-based ferrite has low core loss at a frequency of 100kHz, a maximum magnetic flux density of 200mT, and a temperature of 100°C. However, at higher frequencies (300 to 500kHz), the core loss does not change over a wide temperature range. low enough
[0008] Co is known to be effective in improving the temperature dependence of core loss, however, due to the divalent metal ions (Co 2+ ) tends to migrate through lattice defects, thus leading to an increase in magnetic anisotropy, an increase in core loss and a decrease in magnetic permeability, such as time-dependent changes in magnetic properties, which are large in high-temperature environments

Method used

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  • MnZn-BASED FERRITE SINTERED BODY

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～50 and comparative example 1～8

[0076] Fe as the main component 2 o 3 powder, ZnO powder and Mn 3 o 4 The powders were wet-mixed at the compounding ratio shown in Table 1, dried, and calcined at 900° C. for 3 hours. It should be noted that in Table 1, Mn 3 o 4 The amount of powder added is expressed in terms of MnO. With respect to 100 parts by mass of each obtained calcined powder, SiO was added in the ball mill at the compounding ratio shown in Table 1 2 Powder, CaCO 3 Powder, Co 3 o 4 Powder, ZrO 2 Powder and Ta 2 o 5 The powder was pulverized and mixed for the time shown in Table 2 until the average pulverized particle size was about 1.2 to 1.4 μm. Polyvinyl alcohol was added as a binder to each of the obtained mixtures, pelletized in a mortar, and then press-molded to obtain a ring-shaped molded body.

[0077] Each molded body was sintered by a sintering process consisting of a heating step from room temperature to the holding temperature shown in Table 2, a high temperature holding step of...

Embodiment 51～53 and comparative example 9～11

[0142] Except having used the composition shown in Table 6 and the manufacturing conditions shown in Table 7, it carried out similarly to Example 1, and produced the MnZn type ferrite sintered body. For each MnZn-based ferrite sintered body, the density, volume resistivity ρ, average crystal grain size, initial magnetic permeability μi, and core loss Pcv were measured in the same manner as in Example 1. In addition, the evaluation of the core loss Pcv was performed on the conditions of the frequency of 300 kHz and the excitation magnetic flux density of 100 mT. The results are shown in Tables 8 to 10.

[0143] Next, after holding the magnetic cores of each MnZn-based ferrite sintered body in a high-temperature tank at 200° C. for 96 hours, they were taken out from the high-temperature tank and the temperature of the magnetic cores was lowered to room temperature, and the cores were placed under the same conditions as above. Measure the core loss at 20°C, 40°C, 60°C, 80°C, 100...

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Abstract

A MnZn-based ferrite sintered body which contains a main component and an auxiliary component and has an average crystal grain diameter of 3 [mu]m or more and less than 8 [mu]m and a sintered body density of 4.65 g / cm<3> or more, wherein the main component is composed of Fe in an amount of 53.30 to 53.80 mol% in terms of Fe2O3 content, Zn in an amount of 6.90 to 9.50 mol% in terms of ZnO content and a remainder made up by Mn in terms of MnO content, and the auxiliary component is composed of Si, Ca, Co, Zr and Ta in amounts of 0.003 to 0.020 part by mass in terms of SiO2 content, more than 0 part by mass and 0.35 part by mass or less in term of CaCO3 content, 0.30 to 0.50 part by mass in terms of Co3O4 content, 0.03 to 0.10 part by mass in terms of ZrO2 content and 0 to 0.05 part by mass in terms of Ta2O5 content, respectively, relative to the total amount, i.e., 100 parts by mass, of the main component in the above-mentioned terms.

Description

technical field [0001] The present invention relates to a MnZn-based ferrite sintered body suitable for use in magnetic cores of electronic components such as transformers, inductors, reactors, and choke coils in various power supply devices. Background technique [0002] Electric vehicles such as EV (Electric Vehicle, electric vehicle) and PHEV (Plug-in Hybrid Electric Vehicle, plug-in hybrid electric vehicle), which are rapidly popularizing in recent years, are equipped with high-output motors and chargers as one of the electric transportation equipment. and other equipment, which use electronic components that withstand high voltage and high current. Electronic components are basically composed of a coil and a magnetic core, and the magnetic core is composed of a magnetic material such as a MnZn-based ferrite sintered body. [0003] In such applications, not only various mechanical and electrical loads are applied to electronic components during driving, but also the amb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38H01F1/34
CPCH01F1/344C04B35/26C04B35/2658C01G49/0072C04B35/62645C04B35/64C04B2235/724C04B2235/727C04B2235/726C04B2235/72C04B2235/6567C04B2235/6562C04B2235/6565C04B2235/658C04B2235/6583C04B2235/96C04B2235/3418C04B2235/3208C04B2235/3275C04B2235/3217C04B2235/3244C04B2235/785C04B2235/786C04B2235/77C04B2235/78H01F41/0246C01P2002/52C01P2004/61C04B35/265C04B35/6262C04B35/62655C04B35/63416C04B2235/3251C04B2235/3274C04B2235/3277C04B2235/442C04B2235/5436C04B2235/604
Inventor 三吉康晴多田智之小汤原德和
Owner HITACHI METALS LTD
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