JPH026202B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention comprises a wear-resistant high permeability alloy consisting of Fe, Nb and Ni, and Fe, Nb and Ni as main components,
Sub-components include Cr, Mo, W, V, Ta, Mn, Ge,
This relates to a magnetic recording/reproducing head made of a wear-resistant high permeability alloy containing one or more of Co, Cu, Ti, Zr, Al, Si, Sn, Sb, and rare earth elements, and its purpose is To provide a magnetic recording/reproducing head made of a high magnetic permeability alloy that is easy to forge and process, has a high magnetic permeability, has a recrystallized texture of {110}<112>, and has good wear resistance. be. Currently, Permilo (Ni-Fe alloy), which has high magnetic permeability and is easily formed, is generally used as a magnetic material for magnetic recording/reproducing heads. The wear is severe, and improving it is an important issue. The present inventors have discovered that Ni-
Since the Fe-Nb alloy has high hardness and is therefore a high magnetic permeability alloy with excellent wear resistance, we discovered that it is suitable as a magnetic alloy for magnetic recording/reproducing heads, and previously filed a patent application for this alloy ( Special Public Service 1977-
No. 29690, Japanese Unexamined Patent Publication No. 47-25697). Generally speaking, the higher the hardness, the better the wear resistance.
At the same time, workability is impaired, so increasing the hardness is not preferable from the viewpoint of mass productivity. It is generally known that wear phenomena differ depending on crystal orientation, and that crystal anisotropy exists. The purpose of the present invention is to actively utilize this crystal anisotropy of wear, and by forming a texture with excellent wear resistance, it is possible to further improve wear resistance without impairing workability. I thought it was possible. Based on this, the present inventors further determined that Nb3.1
As a result of further research to further improve the wear resistance of Ni-Fe-Nb alloys containing ~14%, we found that after processing at a processing rate of 50% or more,
It has been discovered that a high magnetic permeability alloy with extremely excellent wear resistance can be obtained by heating at a temperature of 900°C or higher to form a {110}<112> recrystallized texture. That is, in the present invention, Fe5 to 25.5% by weight,
The main components are 3.1 to 14% Nb and the balance Ni, and the subcomponents are Cr, Mo, V, Ge, Co, and Cu, each up to 7%, Ta, Mn, each up to 15%, Ti,
5 each of Zr, Al, Si, Sn, Sb, and rare earth elements
Total of 1 type or 2 or more types below 0.01-15%
and a small amount of impurities, it is easy to forge, has high magnetic permeability with an initial permeability of 3000 or more and a maximum permeability of 5000 or more, and has a recrystallized texture of {110} <112> and has good wear resistance. The present invention provides a magnetic recording/reproducing head made of a high magnetic permeability alloy. In addition, the preferred alloy of the present invention has Fe5 to 25.5%,
The main component consists of 3.1 to 14% Nb and the balance Ni, and the subcomponents include Cr, Mo, W, V, Ta, Mn, Ge,
Co and Cu less than 7% each, Zr, Sn, Sb,
Contains one or more rare earth elements, Ti, Al, and Si at 3% each, totaling 0.01 to 15%. Here, "rare earth elements" include Y, Sc, and lanthanoids (La, Ce, Pr, Nd, Pm,
Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb,
Lu). To make the alloy of the present invention, Fe5~25.5%,
Appropriate amount of Nb3.1~14% and balance Ni, Cr,
Any one or two of Mo, W, V, Ge, Co, Cu
7% or more of species, one or two of Ta and Mn
15% or less, further adding a predetermined amount of Ti, Zr, Al, Sn, Sb, and rare earth elements in a total of 0.01 to 15% of one or two or more and 5% or less, After stirring thoroughly and melting the mixture to a uniform composition using an appropriate melting furnace in air, preferably in a non-oxidizing atmosphere or in vacuum, manganese, silicon, aluminum, titanium, boron, calcium alloys, magnesium alloys are melted. , beryllium alloy, and other deoxidizing and desulfurizing agents are added in small amounts to remove impurities as much as possible. Next, the resulting molten alloy is poured into a mold of an appropriate shape and size to obtain a sound ingot, which is then forged or hot worked at high temperatures to form an appropriate shape, such as a rod. Or board and pear,
If necessary, annealing is performed at a temperature of 500℃ or higher. Next, this is subjected to cold working at a processing rate of 50% or more by a method such as cold rolling to produce a thin plate of the desired shape, for example, a thin plate with a thickness of 0.1 mm. Next, an annular plate having an outer diameter of 45 mm and an inner diameter of 38 mm, for example, is punched out from the thin plate, heated in hydrogen or other suitable non-oxidizing atmosphere, or in vacuum at a temperature of 900°C or higher and lower than the melting point for an appropriate period of time, and then Cool at an appropriate rate corresponding to the temperature, or reheat at a temperature of about 600°C or less for an appropriate period of time, and then cool. In this way, it has an initial magnetic permeability of 3000 or more and a maximum magnetic permeability of 5000 or more.
In addition, a magnetic recording/reproducing head made of a wear-resistant high permeability alloy having a recrystallized texture of {110}<112> can be obtained. The above cold working is effective in reducing deterioration of magnetic properties due to external stress after heat treatment (for example, deterioration due to lamination and resin molding during the manufacture of magnetic heads), and the cold working described above is Heat treatment is very effective in increasing the initial permeability, maximum permeability, and effective permeability in an alternating magnetic field. The invention will now be explained with reference to the drawings. Figure 1 shows the recrystallization texture and various properties of a Ni-Fe-Nb alloy containing about 79.5% Ni when heated at 1100℃ after cold rolling at a processing rate of 90% and Nb.
This shows the relationship with quantity. Nb0%Nb−
When Fe-based alloys are cold rolled, {110}<112>+
A processed texture of {112}<111> is produced, but when this is heated, a recrystallized texture of {110}<001> develops. However, when Nb is added to this, the stacking fault energy decreases, a {110}<112> recrystallized texture develops, and the amount of wear decreases significantly. Also, Figure 2 shows 79.5%Ni-11.5%Fe-9%
This shows the relationship between the recrystallized texture and various properties and cold working rate when Nb alloy is heated at 1100℃, and the increase in cold working rate is {110}<112
> resulting in the development of a recrystallized texture, significantly improving wear resistance. Figure 3 shows the relationship between heating temperature, recrystallization texture and various properties after rolling a 79.5%Ni-11.5%Fe-9%Nb alloy at a cold working rate of 90%.
As the heating temperature increases, the {112}<111> component decreases, and {110}<112> almost develops at temperatures above 900°C, indicating that the wear resistance significantly improves when heated above 900°C. {110}< like this
Considering the relationship between recrystallization texture of <112> and improvement of wear resistance, the Ni-Fe-Nb alloy single crystal exhibits large uniaxial magnetic anisotropy in the <110> orientation. 110}, and therefore {110}<
It is considered that wear resistance is effectively improved by forming a recrystallized texture of 112>. In the present invention, cold working is {110}<112>+
It is necessary to form a {112}<111> texture and develop a {110}<112> recrystallization texture based on this, and as seen in Figures 1 and 2, Nb3. At 1% or more, the development of {110}<112> recrystallized texture is remarkable, especially when cold working is performed at a working rate of 50% or more, and the wear resistance is significantly improved and the magnetic permeability is also high. . In addition, the heating performed after the cold working described above not only homogenizes the structure and removes processing strain, but also develops a {110}<112> recrystallized texture, resulting in high magnetic permeability and excellent wear resistance. However, as shown in Figure 3,
Heating above 900°C significantly improves magnetic permeability and wear resistance. In addition, in the above-mentioned heating, the inclusion of a trace amount of oxygen in hydrogen or other suitable non-oxidizing atmosphere or in vacuum not only has no effect on the magnetic properties and wear resistance of the alloy of the present invention, but also depends on the composition. may improve these properties. In addition, repeating the cold working at a processing rate of 50% or more and the subsequent heating above 900°C and below the melting point increases the degree of accumulation of the {110}<112> recrystallized texture and improves wear resistance. It is effective for improving sex. Next, the invention will be explained with reference to examples. Example 1 Alloy number 14 (composition Ni = 79.5%, Fe = 11.5%, Ni
99.8% pure electrolytic nickel as raw material, 99.9
% purity electrolytic iron and 99.8% purity niobium were used. To prepare the sample, raw materials were placed in an alumina crucible with a total weight of 800 g, melted in a vacuum using a high-frequency induction electric furnace, and then thoroughly stirred to form a homogeneous molten alloy. Next, this was poured into a mold with a hole of 25 mm in diameter and 170 mm in height, and the resulting ingot was forged at about 1000°C to form a plate with a thickness of about 7 mm. About 900℃~
It was hot-rolled at 1000°C to a suitable thickness, then cold-rolled at room temperature at various processing rates to obtain a thin plate of 0.1 mm, which was then punched into an annular plate with an outer diameter of 45 mm and an inner diameter of 33 mm. This is then subjected to various heat treatments to improve its magnetic properties and γ when used as the core of a magnetic head.
The wear amount was measured after running for 300 hours using -Fe ₂ O ₃ magnetic tape, and the characteristics shown in Table 1 were obtained.

【table】

[Table] Example 2 Alloy number 77 (composition Ni = 79.3%, Fe = 10.3%, Nb
8.1%, Ge=2.3%) The raw materials used were nickel and iron with the same purity as in Example 1, and niobium and germanium with 99.8% purity.
The method of manufacturing the sample was the same as in Example 1. We performed various heat treatments on the samples and measured their magnetic properties and the amount of wear after running for 300 hours using a γ-Fe ₂ O ₃ magnetic tape when used as the core of a magnetic head.
The characteristics shown in Table 2 were obtained. The characteristics of typical alloys are shown in Table 3.

【table】

【table】

[Table] *: °C/sec As can be seen from the above examples, Table 3, and drawings, Ni-Fe-Nb or Cr, Mo, W,
V, Ta, Mn, Ge, Co, Cu, Ti, Zr, Al, Si,
The alloy of the present invention, in which one or more of Sn, Sb, and rare earth elements is added, is cold-rolled at a processing rate of 50% or more, and then heated at a temperature above 900°C and below the melting point, whereby {110}< By forming a recrystallized texture of
If it is 5000 or more, a high wear-resistant, high magnetic permeability alloy with low coercive force and excellent wear resistance can be obtained. The alloys listed in each example, Table 3, and drawings are relatively pure metals such as Nb, Cr, Mo, W,
Mn, V, Ti, Al, rare earth elements, etc. were used, but economically advantageous commercially available ferroalloys and Mitsushi metals could be used instead, as long as they were sufficiently deoxidized and desulfurized during melting. , almost the same magnetic properties, wear resistance, and workability as when these metals are used alone can be obtained. As mentioned above, the alloy of the present invention is easy to process, has excellent wear resistance, high magnetic permeability, and low coercive force, so it is suitable as a magnetic alloy for the core and case of magnetic recording/reproducing heads. It is also suitable as a magnetic material for general electromagnetic equipment that requires wear resistance and high magnetic permeability. Next, in the present invention, the composition of the alloy is Fe5~25.5%,
Nb is limited to 3.1 to 14% and the balance is Ni, and the elements added as subcomponents are Cr, Mo, W, V, Ge,
Co: 7% or less, Ta, Mn: 15% or less, Ti, Zr,
The reason for limiting the content of Al, Si, Sn, Sb, and rare earth elements to 0.01 to 15% in total of one or more of 5% or less is that the composition of The initial magnetic permeability of the range is 3000 or more, the maximum magnetic permeability is 5000 or more, it has a recrystallized texture of {110}<112>, and has excellent wear resistance of 30 microns or less, but it falls outside this composition range. This is because magnetic properties or wear resistance deteriorate. In other words, if Nb is less than 3.1%, the recrystallized texture of {110} <112> will not develop sufficiently, resulting in relatively poor wear resistance, while if it is more than 14% Nb, the hardness will be high, making mass production of forging poor, and the initial Magnetic permeability less than 3000,
This is not preferable because the maximum magnetic permeability is less than 5000. and Fe5~25.5%, Nb3.1~14% and the balance
Alloys in the composition range of Ni have an initial magnetic permeability of 3000 or more and a maximum magnetic permeability of 5000 or more, excellent wear resistance, and good workability, but generally they are further composed of Cr,
Adding Mo, W, V, Ta, Mn, Ge, Cu, etc. has the effect of increasing magnetic permeability, and V, Ta, Co, Ti,
Adding Zr, Al, Si, Sn, Sb, rare earth elements, etc. has the effect of improving wear resistance, and Mn, Ge,
Adding Co has the effect of improving forging and processing. In addition, if cutting of the alloy of the present invention is required depending on the application, Pb, P, Te, S, Ca, Se, etc. may be
There is no problem in adding a small amount of .

[Brief explanation of drawings]

Figure 1 shows the initial magnetic permeability, maximum magnetic permeability, and recrystallization texture when a Ni-Fe-Nb alloy containing approximately 79.5% Ni is cold-rolled at a processing rate of 90% and heated at 1100℃ for 1 hour. Characteristic diagram showing the relationship between the degree of integration, the wear amount of the magnetic head, and the amount of Nb. Figure 2 shows the relationship between 79.5%Ni and 11.5%Ni.
Characteristic diagram showing the relationship between various properties and cold working rate when Fe-9%Nb alloy is cold rolled at various working rates and heated at 1100℃ for 1 hour. Figure 3 shows the relationship between cold working rate and 79.5%.
FIG. 2 is a characteristic diagram showing the relationship between various properties and heating temperature when a Ni-11.5%Fe-9%Nb alloy is cold rolled at a processing rate of 90% and heated at various temperatures.

Claims (1)

[Claims] 1 The main components are Fe5~25.5%, Nb3.1~14%, and the balance Ni in terms of weight ratio, with Cr, Mo, and
W, V, Ge, Co, Cu less than 7% each, Ta,
Mn up to 15% each, Ti, Zr, Al, Si, Sn,
It consists of Sb and rare earth elements of 5% or less each, a total of 0.01 to 15% of one or more kinds, and a small amount of impurities, and has an initial magnetic permeability of 3000 or more, a maximum magnetic permeability of 5000 or more, and {110}<112 A magnetic recording/reproducing head made of a wear-resistant, high permeability Ni-Fe-Nb alloy having a recrystallized texture of >.