JPS5845160A - 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 relates to oxide magnetic materials, particularly Mn-Zn7 elites used in magnetic recording head materials or other materials requiring high density.

Materials for P-density magnetic recording heads for electronic computers, controllers, audio, etc. require materials with good workability because precision processing is performed. For this purpose, the number of vacancies must be small,
In a polycrystalline material, it is necessary that the grain size be fine and uniform.

In VTRs, single crystal ferrite is used as the head material, but although it has a high density, the quality varies widely, the sliding noise is large, and the electrical resistance is α1 to 10.
There are disadvantages such as low

Conventional polycrystalline ferrite has little variation in quality, but it does have pores, which can cause A<- or cracking during processing.It also has low electrical resistance and large material loss.

Although Hot Press 7 Elite has improved some of these drawbacks, it still has pores and the particle size is not necessarily uniform. In addition, hot static pressure press (
HIP) 7erite is also known. (Unexamined Japanese Patent Publication No. 4
9-182%6, JP-A-52-59893) However,
Conventional molded materials have few pores, but the particle size is not necessarily uniform, the electrical resistance is low, and the material loss is large.

The present invention overcomes the drawbacks of the prior art and provides a high-density oxide magnetic material that has uniform and fine grain size, good workability, high electrical resistance, and low material loss. be.

In order to achieve the above object, the present invention provides iron oxide 50-65
In Mn-Zn7 elite consisting of 5 to 30 mol% of zinc oxide and the remainder of manganese oxide, the porosity can be reduced to 0.5% by adding Bi oxide up to α5wt%.
In the present invention, when the iron oxide content is less than 50 mol%, the magnetic properties are excellent, and when it exceeds 65 mol%, the magnetic properties are difficult to obtain. It is difficult to obtain density4, and if the zinc oxide content is less than 5 mol% or exceeds 30 mol%, desired magnetic properties cannot be obtained.

If the amount of B1 oxide exceeds α5vt%, high density cannot be obtained. In order to obtain the effects of the present invention, the amount of oxide of B1 is 0.
Although it is desirable that the content be 3wt% or less, excellent effects can be obtained even within the range of α0 to 41wt.

0 Example 1 mog'y mol%, Zn021 mol% s y go
The raw materials were weighed so that s was 52 mol%, and B1
5onαOfIwt% was added, mixed in a ball mill, dried, and calcined at 900 to 1100 G.Furthermore, crushed in a ball mill, dried, shaped, and primary fired at 110 G.
The porosity is 0 to 1350C. Also, the particle size is 8μ
It was uniform.

Example 2 M11027 mol%, ZnO21 mol%, Fon□
The raw materials were weighed so that , was 52 mol%, and Table 1
B1πOa't- was added in the range shown in Example 1.
A sample was prepared in the same manner as above and subjected to HrE treatment.The results are shown in Table 1.

Table 1 Example 3 Mn036 mol%, Zz>010 mol%, IFa5
The raw materials were weighed so that the amount was outside of 0,554 mol, and 3119- was added in the range shown in Table 2 in the same manner as in Example 2. Samples were prepared in the same manner as in Example 1 and subjected to mouth treatment.

The results are shown in Table 2.

Example number 1mog7%le%, Zn0j1%k%, 7
=, o, etJ2%/'% The raw materials were weighed so that Bi, 0. α05wt% and K10r, Ti, oo, zr, at, Y as subcomponents.
)ia.

Oxides of Ni, Si, Mg%Ou, To, Od, Ta or 0t.

8.0 IWIAttaha! ! A sample was prepared in the same manner as in Example 1 by adding more than one species, and the treatment was performed. Table 3 shows a representative example of the results.

In the above examples, examples of oxides were given, but these include carbonates, hydroxides, and 4a! which decompose into these oxides.
You can also use a platform.

As described above, the Mn-2117 elite according to the present invention has few pores, has a uniform and fine grain size, is easy to work with, has high electrical resistance, and is a high-density material with low material loss. Its industrial contribution is extremely large.

Procedural amendment (, voluntary) 154,5, Z, 1,114,1 Mr. Commissioner of the Japan Patent Office'' (61111c7) Name Person P who makes oxide magnetic material 11゛, +1 1F-11'Re Metal Co., Ltd. Yono R Kono Kenoyo Osamu Address: 2-1-2 Marunouchi, 111-ku, Chiyo, Tokyo
No. I11″L Umbrella Corporation tL Telephone Tokyo 284-
4642 in the ``Detailed Description of the Invention'' Column 0 of the Specification Contents of Correction L The statement in the ``Detailed Description of the Invention'' in the specification is corrected as follows.

Note (1) "Magnetic properties" on page 3, line 10 of the specification is corrected to "good magnetic properties."

(2) In line 11 of the same page of the same book, "61? magnetic properties" is corrected to "good magnetic properties."

(8) Correct the comma of ``obtainable'' on the same page of the same book to a full stop.

(4) “Addition lid” in Table 3 of Chapter 6fi of the same book [addition-(
wt%) Corrected to J.

that's all

Claims (1)

[Claims] L Iron oxide 50-65 mol%, zinc oxide 5-30 mol%
In n-hapherite, the remainder of which is manganese oxide, bismuth oxide is added to α5wt% or less, and the empty □
A high-density oxide magnetic material characterized by a porosity of αl or less. Y, Ha) Ni, 81, Mg, Ou, To, Od, T&
The high-density oxide magnetic material according to claim 1, characterized in that it contains α05wt% or less of an oxide of OPS O, 801 species, or 8 or more species.