JPS60137830A - Production of ferrite of mn-zn system - Google Patents

Abstract

PURPOSE:In production of ferrite of Mn-Zn system, to obtain ferrite having improved magnetic characteristics (especially magnetic loss characteristics), by using MnO.OH as a MnO source. CONSTITUTION:In production of ferrite of Mn-Zn system having a basic composition consisting of 50-70mol% Fe2O3, 10-40mol% MnO, and 5-30mol% ZnO, given amounts of Fe2O3, ZnO, and MnO.OH are blended with other components (CaO, SiO2, ZrO2, and CeO2), calcined, crushed, molded, calcined in a nitrogen gas atmosphere having a controlled oxygen concentration, to prepare ferrite of Mn-Zn system. The above-mentioned ferrite of Mn-Zn system has smaller loss than one using MnCO3 as a MnO source and improved magnetic characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a Mn-Zn ferrite having excellent magnetic properties, particularly low magnetic loss properties, and a method for producing an lln-Zn ferrite using a blended raw material number d3. This invention relates to the improvement of r'1nOWA.

Mn-7,n-based ferrite is widely used in various consumer devices such as communication equipment, electronic computers, and VTR1 magnetic heads, and has been improved according to each application.

Due to the miniaturization and high performance of today's equipment,
Magnetic materials with low magnetic loss are being used.

In this I'In-ZTl ferrite, attempts have been made to improve the magnetic properties by increasing the electrical resistance as a way to obtain a material with low magnetic loss, but the reduction in magnetic loss has not yet been fully satisfied. I can't say it's possible.

In view of the current state of Mn--Zn-based ferrites, the present invention aims at providing Mn--ZTI-based ferrites 1 to 1 that provide superior magnetic properties, and particularly have low magnetic loss properties.

In order to reduce the magnetic loss of Mn-Znn-based adhesive [...], the present invention aims to reduce the magnetic loss of
It is characterized by using a mixture of Mn0 and OH in place of nCo3.

That is, in this invention, Fe2O350 to 70 mol%.

l″InO1 (1-40 mol%.

In having a basic composition of 3 to 307% ZnO
In the method for producing n-ZTI ferrite, r':no.OH is used as the r'lnO source of the compounded raw material.

The basic composition of Mn-Zn ferrite is Fe2O35
G・~70 mol%, Mn010~40 mol%, ZnO3
The reason for setting the content to 30 mol % is that if the composition is other than this, the magnetic permeability will be extremely low and the coercive force will also be too large to be practical as a soft magnetic material.

In this invention, the target Mn-Zn ferrite has the above-mentioned basic composition and contains the following various additives, and even if the sintering temperature is increased, abnormal structures are difficult to occur and it has excellent properties. Low magnetic loss characteristics can be obtained.

The JAN-ZN ferrite according to the present invention includes CaOO, 0.005 to 0.3 wt% as an additive to the above basic composition.

Nb2050.005~0. '25wt%.

S, 020,001-2 wt%.

VO0.01~2111t%.

/V2O30.01~2wt%.

Coo　O, 01-2wt%.

CuO0001~o, 2wt%.

ZrO20.01-0.2 wt%.

5nO20.01-1 wt%.

Coo20.01-0.2wt%.

TLO20.01~1.0wt%.

BL203 0.01-0.2wt%.

Ta205 o,oos~0.2wt%.

MgQ 0.01-1.0wt%.

It contains one or more of the following.

Examples will be shown below to clarify the effects of this invention.

Using Fe2O3, ZTIO, and MnO・OH as blending raw materials, Fe2O353 mol%, MnO3 1 mol%, Z
nO 16 mol%.

Weigh it so that it has a basic composition of

SLO, ZrO2, -02 were added as shown in Table 1, blended and mixed, and then calcined at 900°C. After that, it was ground in a ball mill to make an outer diameter of 36mm and an inner diameter of 240un.
It was molded into a ring shape with dimensions of x height em and fired at 1250°C for 3 hours in a nitrogen gas atmosphere with controlled oxygen concentration. The magnetic properties of the obtained fired product were measured and the results are shown in Table 1.

For comparison, we also used conventional Mll as a tlno source.
A ring-shaped fired body was manufactured under the above conditions except that Co 3 was used, and its magnetic properties were similarly measured.

In addition, the core loss in Table 1 is calculated by winding the above ring-shaped fired product and passing an alternating current of 100kHz to 2000G.
The core loss was measured when

As is clear from Table 1, M according to the manufacturing method of the present invention
It can be seen that n-Zn-based ferrite is effective in reducing core loss and improving magnetic properties.

Below margin Table 1

Claims (1)

[Claims] 1 F1120350-70 mol%, 11no10-4
0 mol%. I having a basic composition consisting of 5 to 30 mol% of Zn0
A method for producing nn-Zn ferrite, characterized in that the method for producing nn-Zn ferrite 1 uses 0.OH as a source of 11nO in the compounded raw material.