JPS5845164A - 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 high-density magnetic recording heads such as those used in electronic computers, audio equipment, and the like require materials with good workability in order to provide precision-processed tubes. For this purpose, it is necessary that there are few pores, and that the polycrystalline material has a fine and uniform grain size.

In VTRs, ferrite single crystal is used as the head material, but although it has a high density, it has drawbacks such as large variations in quality, large sliding noise, and low electrical resistance of α1 to 1Ω.

Conventional polycrystalline ferrite has little variation in quality, but it has pores, which cause grains to peel or crack during processing.

It also has low electrical resistance and material loss.

Hot-pressed 7Elite is a product that has improved some of these drawbacks, but it still has pores and the particle size is not necessarily uniform. Also known is hot isostatically pressed (H-P) ferrite. (Unexamined Japanese Patent Publication No. 49-1
28!96, Japanese Unexamined Patent Publication No. 52-59893) Although conventional materials have few pores, the particle size is not necessarily uniform, and the electrical resistance is low, resulting in large material loss.

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

In order to achieve the above object, the present invention provides iron oxide 50-65
In Mn-Zn ferrite consisting of 5 to 30 mol% of zinc oxide and the remainder of manganese oxide, the porosity was reduced to 0.05% or less by adding PbV oxides of αFiwt% or less. This is a characteristic feature.

In the present invention, when the amount of iron oxide is less than 50 mol 2 , it is difficult to obtain magnetic properties, and when it exceeds 65 mol 2 , it is difficult to obtain magnetic properties, and furthermore, it is difficult to obtain high density.

Further, if the zinc oxide content is less than 5 mole % or more than 30 mole %, desired magnetic properties cannot be obtained.

If the amount of oxides of Pb and V exceeds 05 wt%, high density cannot be obtained. In order to obtain the effects of the present invention, it is desirable that the amount of oxides of Pb and V be less than αSwt%, but
Excellent effects can be obtained within the range of 0.01 wt.

Hereinafter, the present invention will be explained in detail based on examples.Example 1 0.27 mol%, -021 mol%, 52 mol% of A.
Weigh the raw materials so that they are in mol%, and further add PbOα05
wt% and Vmo6α1wt% were added, mixed in a ball mill, dried, and calcined at 900-11000. Furthermore, it is crushed in a ball mill, dried, shaped and fired for 1 lo.
o ~ 1350 C to reduce the porosity to t-5% or less. Next, the test was carried out in a human atmosphere at 1 goop and 1 aoo atmospheric pressure. The porosity was 0.3%, which was zf'-aaQ, and the particle size was &5μ, which was uniform.

Example 2 Mn027%le%, Zn021%le%, lN1m
01 f 52 % % Weigh the raw materials in a toss-like manner, and then add pbo and 7.0% within the range shown in Table 1. A sample was prepared in the same manner as in Example 1 with the addition of Qj, and Ω treatment was performed. The results are shown in Table 1.

Table 1 Mn031) T-Rue, 2m10 mol%,'l-06
The raw materials were weighed so that 54% k%
A sample was prepared in the same manner as in Example 1, and the Ω treatment was performed. The results are shown in Table 2.

Table 2 Implementation side number 027 mol%, addition 081 mol%, r-〇, 527y%
Weigh the raw materials with a lid and add PbOα015wt.
%, V, O, α1wt, % and as a subcomponent x, or
,'ri,oo,zr,s*Y,qNa,Ni,81
, Mg, Ou, 'E's, Od, Ta oxide or a
Samples were prepared in the same manner as in Example 1 by adding 1 wt or two or more of t, 1s, and a, and Ω treatment was performed.

Table 3 shows representative examples of the results.

Table 3 In the above embodiments, examples of oxides have been given, but hydroxides, sulfuric acid salts, etc. can also be used to convert into charcoal which decomposes into monoxides.

As described above, M! according to the present invention! 1- Zn 7 elite is a high-density material with few pores, uniform and fine particle size, excellent workability, high electrical resistance, and low material loss, and the industrial contribution of the present invention is extremely important. Amendment 7 (spontaneous) n,, +h+ Fh7.1411411 Mr. Commissioner of the Japan Patent Office! 111 (7) Name f Indication Person who corrects oxide magnetic materials Relationship with 1 Patent Applicant Person I + Place
2-1-2g-8 Marunouchi, Chiyo Il1-ku, Tokyo#
75081 Ultate Yosen Co., Ltd. Representative Keno Kono.

Agent Person: 1 + I Address: 2-1 Marunouchi, Chiyo 1η-ku, Tokyo
``Detailed Description of the Invention'' column of the specification subject to amendment No. 2.

Contents of the amendment As shown in the attached sheet/-ゝ＼ Contents of the amendment I The description in the "Detailed Description of the Invention" column of #i is corrected as follows.

Note L Insert a comma after rPbJ on page 3, line 6 of the specification.

2 Correct “Loss (mW) J” in Table 2 of Chapter 6 of the same book to “Loss O (mwloO) J”.

& “Additional amount” in Table 1 on page 7 of the same book is “Additional amount (wt%)”
)”.

that's all -36shi

Claims (1)

[Claims] L: 50 to 65 mol% of iron oxide, 5 to 30 mol% of zinc oxide
In Mu-Zn7 elite, the balance of which is manganese oxide, lead oxide is α5wt% or less, and vanadium oxide is α5wt%.
A high-density oxide magnetic material characterized in that it has an additive content of 0.05% or less and a porosity of 0.05% or less. 2 As subcomponents, Or, Ti, Oo, Zr,
16a'Q. Y, )ia, lii, Si, Mg, Ou, To, Od,
%Ta oxide or ot, o, s ill or 2
The high-density oxide magnetic material according to claim 1, characterized in that it contains α05wt% or less of at least one species.