JPS6130405B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention is a wear-resistant high permeability alloy consisting of Fe, Nb, and Ni, with Fe, Nb, and Ni as main components, and sub-components of Cr, Mo, W, V, Ta, Mn, Ge,
This relates to wear-resistant high permeability alloys containing one or more of Co, Cu, Ti, Zr, Al, Si, Sn, Sb, and rare earth elements, and its purpose is to facilitate forging and processing. Easy to use, high permeability,
The object of the present invention is to obtain a magnetic alloy having a recrystallized texture of {110}<112> and having good wear resistance. Furthermore, the present invention relates to a magnetic recording/reproducing head made of these wear-resistant high permeability alloys. Currently, permalloy (Ni-Fe alloy), which has high magnetic permeability and is easily molded, is commonly used as a magnetic material for magnetic recording/reproducing heads, but the magnetic head is subject to severe wear due to the running of the magnetic tape. Improving this is considered an important issue. The present inventors proposed a Ni-Fe film containing 3.1 to 14% Nb.
- Since Nb-based alloys have high hardness and are therefore highly wear-resistant and have high magnetic permeability, we have discovered that they are suitable as magnetic alloys for magnetic recording/reproducing heads, and have previously filed a patent application for this. Kosho 47-
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 present invention aims to further improve wear resistance without impairing workability by forming a texture with excellent wear resistance in order to actively utilize this crystal anisotropy of wear. It was thought that this was possible. Based on this, the present inventors further determined that Nb3.1
As a result of further research in order to further improve the wear resistance of Ni-Fe-Nb alloys containing up to 14%, we found that after applying a processing rate of 50% or more, we heated them at a temperature of 900℃ or higher. } It has been discovered that by forming a recrystallized texture of <112>, a high magnetic permeability alloy with extremely excellent wear resistance can be obtained. That is, in the present invention, Fe5 to 25.5% by weight,
Consisting of 3.1 to 14% Nb and the balance Ni, or with this as the main component and subcomponents of Cr, No, W,
V, Ge, Co and Cu are each 7% or less, Ta,
Mn up to 15% each, Ti, Zr, Al, Si, Sn,
Consisting of one or more types of Sb and rare earth elements of 5% or less each, and a total of 0.01 to 15% and a small amount of impurities, it is easy to forge and has an initial magnetic permeability of 3000 or more.
High magnetic permeability with a maximum permeability of 5000 or more, {110}<112>
The object of the present invention is to provide a wear-resistant, high magnetic permeability alloy that has a recrystallized texture and has good wear resistance and is used in magnetic recording/reproducing heads and the like. In addition, the preferred alloy of the present invention has Fe5 to 25.5%,
The main component is 3.1 to 14% Nb and the balance is Ni, and the subcomponents are Cr, Mo, W, V, Ta, Mn, Ge, Co, and Cu, each up to 7%, Zr, Sn, Sb, rare earth elements, and Ti. , Al, and Si in a total of 0.01 to 15% of one or more of 3% each. Here, "rare earth elements" refer to 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%,
After melting an appropriate amount of Nb3.1 to 14% and the balance Ni in air, preferably in a non-oxidizing atmosphere or in vacuum using a suitable melting furnace, manganese,
Add small amounts of silicon, aluminum, titanium, boron, calcium alloys, magnesium alloys, beryllium alloys, and other deoxidizing and desulfurizing agents to remove impurities as much as possible. Alternatively, Cr, Mo, W,
7% or less of V, Ge, Co, Cu, 15% or less of Ta, Mn, 5% or less of Ti, Zr, Al, Sn, Sb, rare earth elements, the total of one or more of 0.01 to 15% or less Add a further quantity of . The mixture thus obtained is thoroughly agitated to create a uniform molten alloy composition. Next, this is poured into a mold of an appropriate shape and size to obtain a sound ingot, which is then forged or hot-worked at a high temperature to form an appropriate shape, such as a bar or plate, to form the required shape. then 500
Anneal at temperatures above ℃. 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 with an outer diameter of 45 mm and an inner diameter of 33 mm, for example, is punched out from the thin plate and heated at 900°C in hydrogen or other suitable non-oxidizing atmosphere or in vacuum.
The mixture is heated at a temperature below the melting point for an appropriate period of time, and then cooled at an appropriate rate depending on the composition, or further heated at a temperature of about 600° C. or below for an appropriate period of time, and then cooled. In this way, it has an initial magnetic permeability of 3000 or more, a maximum magnetic permeability of 5000 or more, and {110}<
A wear-resistant high permeability alloy with a recrystallized texture of >112 is obtained. The above-mentioned 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 above-mentioned cold working in hydrogen 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 relationship between the recrystallized texture and properties of a Ni-Fe-Nb alloy containing about 79.5% Ni when heated at 1100°C after cold rolling at a working rate of 90% and the amount of Nb. It is something that When a Ni-Fe alloy containing 0% Nb is cold rolled, {110}<112>+{112}<
A processing texture of {111> is produced, but when this is heated, a recrystallization texture of {100}<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. 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 the heating temperature, recrystallization texture and texture properties after rolling a 79.5%Ni-11.5%Fe-9%Nb alloy at a cold working rate of 90%.
The {112}<111> component decreases as the heating temperature increases, and {110}<112> almost develops at temperatures above 900°C, indicating that wear resistance significantly improves when heated above 900°C. There is. Considering the relationship between {110}<112> recrystallization texture and improvement in wear resistance, we find that Ni-Fe-Nb alloy single crystals exhibit large uniaxial magnetic anisotropy in the <110> direction. From this, it is inferred that Nb atoms are selectively arranged on a specific {110} plane, and therefore, a recrystallized texture of {110}<112> is formed, which improves wear resistance. It is considered that this will be carried out effectively. 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 It's also expensive. In addition, the heating performed after the cold working described above not only homogenizes the structure and removes processing distortion, but also develops a {110}<112> recrystallized texture, resulting in high magnetic permeability and excellent wear resistance. However, as shown in FIG. 3, magnetic permeability and wear resistance are significantly improved by heating to 900° C. or higher. In addition, in the above 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 varies depending on the composition. In some cases, these characteristics may be improved. 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%,
Production of alloy of Nb=9%) 99.8% pure electrolytic nickel as raw material, 99.9%
Purity electrolytic iron and 99.8% purity niobium were used. To prepare the sample, a total of 800 g of raw materials were placed in an alumina crucible, melted in a high-frequency induction electric furnace in a vacuum, 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. Further about 900℃~1000℃
The material was hot-rolled at a temperature of 0.3°C to an appropriate 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 38 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.
-We measured the amount of wear after running for 300 hours using Fe ₂ O ₃ magnetic tape, and obtained the characteristics shown in Table 1.

【table】

[Table] Example 2 Alloy number 77 (composition Ni = 79.3%, Fe = 10.3%,
Production of alloy with 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 γ-Fe ₂ O ₃ magnetic tape when used as the core of a magnetic head, and found that the properties shown in Table 2 are as follows. Obtained. The characteristics of typical alloys are shown in Table 3.

【table】

[Table] 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 containing one or more of Sn, Sb, and rare earth elements can be cold-rolled at a processing rate of 50% or more, and then heated at a temperature above 900°C and below the melting point to yield {110}<112 By forming a recrystallized texture of This makes it a highly abrasion resistant, high magnetic permeability alloy with a small surface area and excellent abrasion resistance. The alloys listed in each example, Table 3, and drawings include relatively pure metals Nb, Cr, Mo, W,
Mn, V, Ti, Al, Si, rare earth elements, etc. were used, but even if economically advantageous commercially available ferro alloys and Mitsushi metals were used instead of these, sufficient deoxidation and desulfurization could be achieved during melting. For example, almost the same magnetic properties, wear resistance, and workability can be obtained as when these metals are used alone. 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 set to Fe5~25.5.
%, Nb3.1~14% and the balance Ni, and the elements added as subcomponents are Cr, Mo, W, V,
Ge, Co 7% or less, Te, Mn 15% or less, Ti,
The reason why Zr, Al, Si, Sn, Sb, and rare earth elements are limited to 0.01 to 15% in total of one or more of 5% or less is as clear from each example, Table 3, and drawings. This composition range has an initial magnetic permeability of 3000 or more, a maximum permeability of 5000 or more, a recrystallized texture of {110}<112>, and excellent wear resistance of 30 microns or less. This is because magnetic properties or abrasion resistance will deteriorate if it is out of alignment. 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, the mass productivity of forging will be poor, and the initial penetration will be poor. This is because the magnetic coefficient is 3000 or less and the maximum permeability is 5000 or less. and Fe5~25.5%, Nb3.1~14% and the balance
Alloys in the Ni composition range have an initial permeability of 3000 or more and a maximum permeability of 5000 or more, excellent wear resistance, and good workability.
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, Co
Adding has the effect of improving forging and processing. If cutting of the alloy of the present invention is required depending on the application, small amounts of Pb, P, Te, S, Ca, and Se may be added to the extent that the magnetic properties and wear resistance of the present invention are not impaired. It's okay to do that.

[Brief explanation of the drawing]

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

Claims (1)

[Claims] 1 Consisting of 5 to 25.5% Fe, 3.1 to 14% Nb, and the balance Ni and a small amount of impurities by weight, and has an initial permeability
3000 or more, maximum permeability 5000 or more, and {110}<
A wear-resistant, high permeability Ni-Fe-Nb alloy characterized by having a recrystallized texture of 112>. 2 The main components are Fe5~25.5%, Nb3.1~14%, and the balance Ni in terms of quantity ratio, and the secondary components are Cu, Mo,
W, V, Ge, Co, Cu are each 7% or less, Ta,
Mn up to 15% each, Ti, Zr, Al, Si, Sn,
It consists of one or more types of Sb and rare earth elements of 5% or less each, a total of 0.01 to 15%, 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 wear-resistant, high permeability Ni-Fe-Nb alloy characterized by having a recrystallized texture of >. 3 Consists of Fe5~25.5%, Nb3.1~14%, balance Ni and a small amount of impurities in weight ratio, initial permeability
3000 or more, maximum permeability 5000 or more, and {110}<
A magnetic recording/reproducing head made of a wear-resistant, high permeability Ni-Fe-Nb alloy having a recrystallization texture of >112.