JPS59232965A - Low loss oxide magnetic material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention uses 30 to 37 mol of MnO as the main component.

10-15 molt ZnOr residue with li'6203,
and TiO2p of 0.4% by weight or less and/or Li 203 of 0.2% by weight or less and Ti02 or 02% of Ti02 of 1.0% by weight or less as additional components.
The present invention relates to a low-loss oxidized magnetic material in which raw materials containing either or both of the following LiCO3 are mixed, granulated, press-molded, and then sintered.

Conventionally, a switching frequency of about 25 kHz is used in a transformer of a switching power supply. However, in order to make the power supply smaller and lighter, the switching frequency is increased to 1.00 kHz or more. In such a high frequency switching power supply using high frequency, there is a drawback that the magnetic core material of the transformer generates heat due to iron loss due to power loss.

An iron core material that minimizes this kind of iron loss at an ambient temperature of 100°C is required; for example, the initial permeability μi is 2.
500 or more, saturation magnetic flux density B8 is 5000 Gauss or more,
Residual magnetic flux less than 1000 Gauss.

Characteristics such as specific resistance of 50Ω-σ or more are required.

The object of the present invention is to provide a manufacturing method for obtaining a low-loss oxide magnetic material that can be used as an iron core material that minimizes core loss at high frequencies by eliminating such conventional drawbacks.

The first embodiment of the present invention has 52 molar Fe as the main component.
O3+ 34 mol of Mn0 and 14 mol of ZnO are mixed with Li2CO3 or TiO2 as an additive.

These were granulated, molded and pressed, and then sintered at an oxygen partial pressure of 1.3 atomic V and a temperature of 1310°C.

An oxide magnetic material is obtained.

Regarding the amount of Li3CO3 or TiO2 added here, as shown in Fig. 1, the amount of TiO2 added is 0.6% by weight, depending on the temperature (
T) C℃) and power loss (P B) [kW/yy+,
: ] When we calculate the relationship, we find that the stain force loss (PB) of the additive is smaller than that of the non-additive, and when the amount added is 0.6% by weight, there is no effect of the additive. Therefore, the addition of TiO2 has the effect of reducing the power loss (PB) at 100°C.

When the weight ratio exceeds 0.4, the effect becomes more pronounced.

On the other hand, regarding the addition of L42CO3, as shown in Figure 2, the power loss (PB) at 100°C is the minimum when 0.05 parts by weight is added, similar to the case of TiO2, but 0.15 parts by weight It is clear that once the limit is exceeded, the effect disappears.

Further, the second embodiment of the present invention has 52 810 as the main component.
2, and Li 203 or Ti as an additional component.
By containing O2, a low-loss oxidized magnetic material can be obtained as in the first embodiment.

Regarding the material obtained in this way, L
Power loss (P B ) [kW/m3:l] by changing the weight factor of TiO2 while keeping iCO3 constant at 0.05 weight factor
, coercive force (HC) C Oersted], magnetic flux density (Ihs
) C Gauss].

Specific resistance (h+a) [Ωm] and magnetic permeability (μ) are determined. In particular, the power loss (
The relationship between the content of PB) and TiO2 is curve A at room temperature, 60
Curve B at 100°C, Curve C at 100°C 2120°C
If the TiO2 content is 0.4% by weight or less, the power loss (PB) may be small at high temperatures due to the curve in
It is clear that it becomes more noticeable at 100°C than at 0°C. Also, if TiO2 exceeds 0.4 weight ratio, 10
The stain force loss (PB) is greater at 0°C than at 60°C.

Also, in Fig. 4, Li2C is shown as in Fig. 3.
When calculating O3, it is clear that when Li2CO3 exceeds 0.05 weight percent and is 0.155 weight % or less, the power loss (PB) at 100°C becomes smaller than that at 60°C.

Furthermore, as a third example, 52.5 mol of F is added to the main component.
e2O3+ 34 moles of MnO and 13.5 moles of MnO are mixed in the weight ratio as shown in Table 1.2.3, and a magnetic material is determined in the same manner as in the first example.

Margin below (5) As described above, according to the present invention, by mixing appropriate amounts of +Tt02 and Li2CO3, the power loss (PB) is lower than that of the conventional method, and especially the power loss (PB) at 100°C is reduced. A small low-loss oxide magnetic material is obtained,
It is ideal as an iron core material used in transformers of high frequency switching power supplies.

[Brief explanation of drawings]

Figures 1 and 2 show temperature vs. power loss PB with additive weight as a parameter in the first embodiment of the present invention.
Figure 1 is a characteristic curve diagram showing the relationship between the additive Tj02
FIG. 2 shows a characteristic curve diagram for the additive L42CO3. FIGS. 3 and 4 show (a) power iron loss P B , (b) coercive force HC, and (c) magnetic flux with respect to the content weight of additives with temperature as a parameter in the second embodiment of the present invention, respectively. Density B, (d) Specific resistance h,
(e) Characteristic curve diagrams showing the relationship between magnetic permeability; FIG. 3 shows the characteristic curve diagram in the case of TiO2 as the additive, and FIG. 4 shows the characteristic curve diagram in the case of the additive Li2CO3. 2 20
1
He-he q Zen R An Eiki 〆ゝ' (-) Kai I Raku6) Unprocedural amendment (spontaneous) July 14, 1985 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case 1988 Patent application No. 103,561 2. Title of the invention: Low-loss oxide magnetic material 3. Person making the amendment 4. Agent 〒105 5. Subject of amendment 1. Claims of the specification, Item 2. Invention of the specification Detailed explanation section 6, Amendment content 1, Claims section (as attached) 2, Specification 1) Page 2, line 3, "Li2O3" is changed to "Li,, between C03J and the correction, line 7. [Corrected LiC03J to "Li2CO3" and corrected "SiO3" to rsio2J on the 5th line 2)6
Page 12 line, “Li3CO3” is corrected to JLi2CO3j 3) Page 4, line 10 [Li,,O8J is changed to “L12CO3”
Between the correction and the 14th line “LiCO3” is changed to “Li2C05j
Corrected 4th line from the bottom, rh + oJ was corrected as "ρ" 4) 6
Page 1, Table 1, 1st column, "LiCO3" is corrected to "Li2CO3" 5) Page 7, 6th line from the bottom, rhJ is corrected to "ρ" (Attachment) Claim 1, 30 to 37 moles as the main component 0. 10～
15 moles of ZnO, the balance is Fe 203, and as an added component less than 0.4 wt TiO2, still 0.2
A low-loss oxidized magnetic material 2 characterized by containing either or both of Li2CO3 in an amount of 30 to 67 mol as the main component, 10 to 1 Mn0, 10 to 1 by weight.
The remainder of 5 mole O is Fe2O3, and the subcomponents are 0.1% by weight or less of CaO and 0.1% by weight or less of 5in.
2. and a low-loss oxidized magnetic material characterized by containing both or one of 1.0% by weight or less of TiO2 or 0.2% by weight or less of Li2CO3.

Claims (1)

[Claims] 1. Mn0.10-1 with a mole ratio of 30-37 as the main component
Low loss characterized by containing 5 mol of ZnOr residue with Fe2O3 and containing or both of TiO2+ of 0.4% by weight or less or Li 203 of 0.2% by weight or less as an additive component. Oxidized magnetic material 2, main components 30-37 moles Mn0.10 and 1.0% by weight or less of TiO2 or 0.2% by weight or less of LiCO
Low-loss oxidized magnetic material characterized by containing both or one of x