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Method of producing MnZn-base ferrite

A manufacturing method, technology of ferrite, applied in chemical instruments and methods, iron compounds, magnetic objects, etc., can solve problems such as endless

Active Publication Date: 2013-04-10
TDK CORPARATION
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  • Claims
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Problems solved by technology

[0010] However, there is no end to the demand for high saturation magnetic flux density, low core loss and excellent balance of characteristics, and it is expected to propose a further improved method of manufacturing MnZn-based ferrite.

Method used

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  • Method of producing MnZn-base ferrite
  • Method of producing MnZn-base ferrite
  • Method of producing MnZn-base ferrite

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Embodiment

[0100] The following specific examples are given to describe the present invention in more detail.

[0101] As a raw material for the main component, prepare Fe 2 o 3 powder, MnO powder, ZnO powder, NiO powder and Li 2 CO 3 Powder, as a raw material of subcomponents, prepare SiO 2 Powder, CaCO 3 , ZrO 2 Powder and Nb 2 o 5 powder.

[0102] The main component raw materials were weighed so that the composition of the ferrite main component shown in Table 2 below was obtained, wet mixed for 16 hours using a wet ball mill, and then dried.

[0103] Then, the dried product was calcined at 900° C. for 3 hours in the air, and then pulverized.

[0104] Add auxiliary component raw materials to the obtained calcined powder so that the ferrite auxiliary component composition shown in the following table 2 is obtained, mix and pulverize to obtain a mixture powder, add a binder to the mixture powder, make granules, and perform molding A ring-shaped shaped body is obtained.

[010...

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Abstract

Provided is a process for producing a MnZn-base ferrite comprising: firing a compacted raw material to produce the MnZn-base ferrite, wherein the firing comprises, in the following order: a heating phase comprising gradually bringing a firing temperature from room temperature up to a maximum temperature; a maximum temperature holding phase comprising maintaining the maximum temperature for a period of time, wherein a partial pressure of oxygen (p2) at the maximum temperature holding phase is greater than an equilibrium partial pressure of oxygen (p1) as follows: p2>p1, wherein the equilibrium partial pressure of oxygen (p1) is represented by the following equation: log(p1)=log(PO2)=a−b / T, wherein PO2 is measured in a unit of %, and T is measured in a unit of absolute temperature K; and a cooling phase comprising gradually bringing the maximum temperature down to near room temperature, wherein a partial pressure of oxygen (p3) at the cooling phase is operated at an equilibrium partial pressure of oxygen based on the equation log(p3)=a−b / T.

Description

technical field [0001] The present invention relates to a method for producing an MnZn-based ferrite capable of obtaining a high saturation magnetic flux density, suppressed core loss, and an excellent balance of characteristics between the saturation magnetic flux density and core loss. Background technique [0002] In recent years, miniaturization and higher output of electronic devices have rapidly progressed. Along with the advancement of high integration and high-speed processing of various parts, a large current of the power supply line for supplying electric power is required. Even components such as transformers and choke coils are required to be driven with high power. In addition, stable and reliable driving at high temperatures is also required in consideration of temperature rise due to heat release during driving. [0003] To meet such demands, low core loss and high saturation magnetic flux density at operating temperature are required as characteristics requ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26
CPCC04B2235/3418C04B2235/3239C04B2235/3284C01G49/009C01G49/0018C04B35/265C04B2235/3208C01G53/006C04B2235/3251C04B2235/6565C04B2235/6562C04B2235/3279C04B2235/6584C04B35/62695H01F1/344C04B2235/3203C04B2235/656C04B2235/5427C04B2235/3262C01P2002/52C04B35/6262C01P2006/80C04B2235/3244C04B2235/3298
Inventor 车声雷森健太郎渡边雅彦青木卓也黑田朋史
Owner TDK CORPARATION
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