JPH032216B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a high magnetic permeability alloy that has excellent magnetic properties and wear resistance in an alternating magnetic field, can be easily forged, and is suitable for a magnetic recording/reproducing head, a method for producing the same, and a magnetic recording/reproducing head. Since magnetic recording/reproducing heads such as tape recorders operate in alternating magnetic fields, the magnetic alloys used therein must have high effective magnetic permeability in high-frequency magnetic fields, and magnetic tapes must slide in contact with each other. Therefore, it is desired that the wear resistance be good. Currently, Sendust (Fe-
(Si-Al alloy) and ferrite (MnO-ZnO
-Fe ₂ O ₃ ), but these are extremely hard and brittle and cannot be forged or rolled, so grinding and polishing methods are used to manufacture the head core, and the finished product is therefore expensive. . Sendust has a high saturation magnetic flux density, but cannot be made into a thin plate, so its effective permeability in a high-frequency magnetic field is relatively low. Also, although ferrite has a high effective permeability, the saturation magnetic flux density is
The disadvantage is that it is small, less than 5000G. On the other hand, permalloy (Ni-Fe alloy) is easy to forge, roll, and punch and has excellent mass productivity, but its major drawback is that it is soft and easily abraded. The present inventors conducted numerous studies on improving the magnetic properties and wear resistance of Ni-Fe alloys, and found that
Ni-Fe alloy with one or two alloys of Group A elements strontium and barium 0.001 to 5
The objective was achieved by adding %. The present invention is a combination of 30 to 90% nickel, one or two of strontium and barium by weight.
0.001 to 5%, balance iron and a small amount of impurities, or the main component is copper 30% or less, tungsten, niobium, tantalum,
15% or less each of manganese, 10% or less each of molybdenum and cobalt, chromium, vanadium,
5% or less each of titanium, silicon, germanium, gallium, indium, thallium, aluminum, zirconium, hafnium, rare earth elements,
Less than 3% each of platinum group elements, beryllium,
Contains a total of 0.01 to 30% of one or more of tin, antimony, boron, and phosphorus (2% or less each), has a saturation magnetic flux density of 5000G or more, has excellent wear resistance and effective magnetic permeability, and is suitable for magnetic recording and reproduction. This invention relates to a high permeability magnetic alloy that can be used for heads, etc. Furthermore, the present invention relates to a magnetic recording/reproducing head with excellent wear resistance manufactured using the above-mentioned high permeability magnetic alloy for the case and core. The features of the present invention are as follows. First invention Weight ratio of nickel 30 to 90%, total of one or two of strontium and barium 0.001 to
1. A wear-resistant, high permeability alloy for magnetic recording/reproducing heads, comprising 5% iron, the balance being iron and a small amount of impurities, and having a saturation magnetic flux density of 5000G or more. Second invention Weight ratio of nickel 30 to 90%, total of one or two of strontium and barium 0.001 to
5%, 30% or less of copper, 15% or less each of tungsten, niobium, tantalum, and manganese, 10% or less each of molybdenum, cobalt, 5% or less each of chromium, vanadium, titanium, silicon, germanium, gallium, indium, and thallium. ,
3% or less each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements, and 2% or less each of beryllium, tin, antimony, boron, and phosphorus, total of 0.01 to 30
%, the balance being iron and a small amount of impurities, and having a saturation magnetic flux density of 5000 G or more. Third invention Weight ratio of nickel 30 to 90%, total of one or two of strontium and barium 0.001 to 0.001
5%, balance iron and a small amount of impurities, in a non-oxidizing atmosphere or in vacuum at a temperature above 600℃ and below the melting point for at least 1 minute.
For a magnetic recording/reproducing head, which is characterized by being heated for an appropriate time corresponding to the composition for 100 hours or less, and then cooling from 600°C or higher to room temperature at an appropriate rate corresponding to the composition, from 100°C/sec to 1°C/hour. Method for manufacturing wear-resistant high permeability alloys. 4th Invention The total weight ratio of 30 to 90% nickel, one or two of strontium and barium is 0.001 to
An alloy consisting of 5% iron, the balance iron and a small amount of impurities is heated at a temperature above 600°C and below the melting point in a non-oxidizing atmosphere or in vacuum for at least 1 minute.
After heating for an appropriate time corresponding to the composition,
Cool from 600℃ or higher to room temperature at an appropriate rate corresponding to the composition of 100℃/sec to 1℃/hour, and then cool it further.
Manufacture of a wear-resistant high permeability alloy for magnetic recording and reproducing heads, which is heated at 600°C or lower in a non-oxidizing atmosphere or in vacuum for a period of 1 minute or more and 100 hours or less, and then cooled. Law. Fifth invention Weight ratio of nickel 30 to 90%, total of one or two of strontium and barium 0.001 to 0.001
The magnetic recording/reproducing head is characterized in that it uses an alloy consisting of 5% iron, the balance being iron and a small amount of impurities. To make the alloy of the present invention, first the main components are 30 to 90% nickel, 1% strontium and 1% barium.
After melting a total of 0.001 to 5% of the seed or two and the balance iron in an appropriate melting furnace in a non-oxidizing atmosphere or vacuum, add a small amount of an appropriate deoxidizing agent or desulfurizing agent to melt as much as possible. Remove impurities and add 30% or less copper, 15% or less each of tungsten, niobium, tantalum, and manganese, and each of molybdenum and cobalt.
10% or less of each of chromium, vanadium, titanium, silicon, germanium, gallium, indium, thallium, 3% or less of each of aluminum, zirconium, hafnium, rare earth elements, platinum group elements, beryllium, tin, antimony, boron , 2% or less of phosphorus, respectively, and 0.01 to 30% of one or more alloys are added and sufficiently stirred to produce a compositionally uniform molten alloy. Next, this is poured into a mold of an appropriate shape and size to obtain a sound ingot, which is then subjected to forming processes such as forging hot rolling and cold rolling at high temperatures to obtain the desired shape, e.g. Make a thin plate with a thickness of 0.1mm. Next, a piece of the desired shape and size is punched out from the thin plate, and it is heated at a temperature above the recrystallization temperature, that is, about 600°C or above, in a suitable non-oxidizing atmosphere or in a vacuum.
In particular, heat to a temperature of 800°C or higher and lower than the melting point for 1 minute or more, and then heat at an appropriate rate depending on the composition, e.g.
Cool at 100°C/sec to 1°C/hour. Depending on the composition of the alloy, this may be further increased to a temperature of about 600°C or below (temperature below the ordered lattice-irregular lattice transformation point), especially 200°C or less.
By heating at 600° C. for 1 minute or more and 100 hours or less and cooling, a high permeability magnetic alloy having a saturation magnetic flux density of 5000 G or more and excellent wear resistance can be obtained. Cooling from the above liquefaction temperature to a temperature above the ordered-disordered lattice transformation point (approximately 600°C) shows that there is no significant difference in the magnetism obtained whether the cooling is rapid or gradual; The following cooling rates have a significant effect on magnetism. In other words, from a temperature above this transformation point
By cooling to room temperature at an appropriate rate corresponding to the composition of 100° C./sec to 1° C./hour, the regularity of the ground can be adjusted appropriately and excellent magnetism can be obtained. If the material is rapidly cooled at a rate close to 100° C./second among the above cooling rates, the degree of order decreases, and if it is cooled any faster, the degree of order does not proceed, and the degree of order decreases further, resulting in deterioration of magnetism. However, when an alloy with a low degree of order is reheated to 200 to 600 degrees Celsius, below its transformation point, and cooled, ordering progresses and the degree of order becomes moderate, improving magnetism. On the other hand, if it is slowly cooled from a temperature above the above-mentioned transformation point at a rate of, for example, 1° C./hour or less, ordering will proceed too much and the magnetism will decrease. Next, examples of the present invention will be described. Example 1 Alloy number 13 (composition Ni=78.5%, Sr=1.0%, Ba
= 1.2%, balance Fe) To make the sample, the total weight of the alloy material with the above composition is required.
800 g of the alumina was placed in an alumina crucible and melted in a high-frequency induction furnace in a vacuum, followed by thorough stirring to obtain a homogeneous molten alloy. Next, this is 25mm in diameter and 170mm in height.
The resulting ingot was poured into a mold with a hole of mm.
It was forged at 1000℃ into a plate approximately 7mm thick. Further, it is hot rolled at about 600 to 900°C to a thickness of 1 mm, and then cold rolled at room temperature to form a thin plate of 0.1 mm.
Then an annular plate with an outer diameter of 45 mm and an inner diameter of 33 mm and the core of the magnetic head were punched out. Next, these were subjected to various heat treatments shown in Table 1, and the annular plate was used to test the magnetic properties, and the core was used to manufacture _a magnetic head. The amount of wear was measured and the results shown in Table 1 were obtained.

[Table] Example 2 Alloy number 42 (composition Ni=79.0%, Nb=7.0%, Sr
= 1.5%, Ba = 1.0%, balance Fe) To make a sample, the total weight of the alloy material with the above composition is
800 g of the alumina was placed in an alumina crucible, melted in a vacuum using a high-frequency induction electric furnace, and stirred well to obtain a molten alloy. The manufacturing process is the same as in Example 1. The samples were subjected to various heat treatments and the properties shown in Table 2 were obtained.

【table】

[Table] Next, Table 3 shows that after heating in a vacuum at 1150°C for 2 hours, cooling from 600°C to room temperature at various rates, or further heating at a temperature below 600°C, The properties of representative alloys measured at room temperature are shown.

[Table] Next, the effect of adding Sr and Ba to the alloy of the present invention will be described in detail with reference to the drawings. Figure 1 shows 78.5%
The relationship between Ba addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount for Ni-Fe-Ba alloy is shown.
Figure 2 shows the relationship between the amount of Ba added and the effective magnetic permeability, saturation magnetic flux density, and wear amount for the 79% Ni-Fe-7% Nb-Ba alloy. Figure 3 shows Sr for 78.5%Ni-Fe-Sr alloy.
The relationship between the addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount is shown in Figure 4.
The relationship between the amount of Sr added and the effective magnetic permeability, saturation magnetic flux density, and wear amount for Nb-Sr alloys was shown. Fifth
The figure shows 78.5%Ni-Fe-1.0%Sr-1.2%Ba alloy with Cu,
FIG. 3 is a characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when W, Nb, Ta, or Mn is added. Figure 6 shows the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density and amount of wear when Mo, Co, Cr, V or Ti is added to the 78.5%Ni-Fe-1.0%Sr-1.2%Ba alloy. It is a characteristic diagram showing a relationship. Figure 7 shows the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when Si, Ge, Ga, In, or Tl is added to a 78.5% Ni-Fe-1.0% Sr-1.2% Ba alloy. FIG. Figure 8 shows 78.5%Ni-Fe-1.0%Sr-1.2%Ba alloy with Al, Zr, Hf, Ce, Pt or Be, Sn, Sb, B
Alternatively, it is a characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when P is added. Generally, as the amount of strontium or barium added increases, the effective magnetic permeability increases significantly and the amount of wear decreases. However, if the content of strontium and barium exceeds 5%, processing becomes difficult, which is not preferable. This improvement in magnetic properties of the present invention is due to the deoxidizing effect of strontium and barium during melting, which removes impurities and cleanses the alloy structure. It is thought that since it forms a cubic crystal with good symmetry, the magnetocrystalline anisotropy energy becomes small, making it easy to magnetize. Furthermore, Ni-Sr system, Fe-Sr system, Ni-Ba system
The Fe-Ba system and Fe-Ba intermetallic compounds precipitate finely, dividing the magnetic domain and increasing the domain wall, which relatively reduces the moving speed of the domain wall in an alternating magnetic field, which reduces eddy current loss and increases the effective permeability. It is thought that magnetic property can be obtained. Furthermore, the wear resistance of the alloy of the present invention is improved by adding strontium or barium, which has a large interatomic distance.
This is thought to be due to solid solution hardening of the -Fe alloy base and fine precipitation of strong intermetallic compounds on the base. Furthermore, Cu, W, Nb, Ta, added as subcomponents
Mn, Mo, Co, Cr, V, Ti, Ge, Ga, In, Tl,
Al, Si, Zr, Hf, rare earth elements, platinum group elements,
Be, Sn, Sb, B, P, etc. are effective in increasing the effective magnetic permeability of the alloy of the present invention, and Co is effective in increasing the saturation magnetic flux density. Furthermore, Cu, W,
Nb, Ta, V, Ti, Ge, Ga, In, Tl, Al, Si,
Zr, Hf, rare earth elements, platinum group elements, Be, Sn,
Sb, B, P, etc. have a great effect on improving the wear resistance of the alloy of the present invention, and Nb, Ta, Mn, Ti, etc.
Si and rare earth elements have a great effect on improving forging workability. In short, the alloy of the present invention has a saturation magnetic flux density of 5000 G or more, high effective permeability, excellent wear resistance, and good workability, so it is not only suitable as a magnetic alloy for magnetic recording/reproducing heads, but also for VTRs and electronic computers. It is also very suitable as a magnetic material for use in magnetic recording/reproducing heads and ordinary electrical equipment. Next, in the present invention, the composition of the alloy is changed from Nickel 30 to
90%, 0.001 to 5% in total of one or both of strontium or barium, and the balance iron,
In addition, the elements added to this are less than 30% copper, and 15% each of tungsten, niobium, tantalum, and manganese.
% or less, molybdenum and cobalt each 10% or less, chromium, vanadium, titanium, silicon, germanium, gallium, indium, thallium each 5% or less, aluminum, zirconium,
The reason for limiting the content to 0.01 to 30% of an alloy of one or more types of hafnium, rare earth elements, and platinum group elements, each of which is 3% or less, and beryllium, tin, antimony, boron, and phosphorus, each of which is 2% or less, is as follows:
As is clear from Table 3 and Figures 1 to 8, the saturation magnetic flux density in the composition range is 5000G.
As described above, the material has excellent effective magnetic permeability and wear resistance, as well as good workability, but if the composition is outside this range, the saturation magnetic flux density will be less than 5000G, the effective magnetic permeability will decrease, and wear will increase. This is because it is difficult to process, making it unsuitable as a material for magnetic recording/reproducing heads. That is, if the content of strontium and barium is less than 0.001%, the addition efficiency is low, and if it exceeds 5%, forging becomes difficult. In addition to this, less than 30% copper is added as a subcomponent.
15% tungsten, 15% niobium, 15% tantalum,
15% manganese, 10% molybdenum, 5% chromium, 5% vanadium, 5% titanium, 5% germanium,
5% gallium, 5% indium, 5% thallium,
3% aluminum, 5% silicon, 3% hafnium
%, rare earth elements 3%, and platinum group elements 3%, the saturation magnetic flux density becomes 5000 G or less. This is because if more than 10% of Co is added, forging or processing becomes difficult, and if more than 10% of Co is added, the effective magnetic permeability decreases. As is clear from Table 3, if any of the subcomponents is added to the Ni-Fe alloy, the effective magnetic permeability will further increase, the hardness will also increase, and the wear resistance will be improved. Addition of sub-ingredients has the same effect and can be considered as an ingredient with the same effect. Rare earth elements consist of scandium, yttrium, and lanthanum-based elements, but the effect of adding their subcomponents is exactly the same, and platinum group elements consist of platinum, iridium, ruthenium, rhodium, palladium, and osmium, but The effect is exactly the same.

[Brief explanation of the drawing]

Figure 1 is a characteristic diagram showing the relationship between barium content, effective magnetic permeability, saturation magnetic flux density, and wear amount of 78.5%Ni-Fe-Ba alloy, Figure 2 is 79%Ni-Fe-7%Nb
-Characteristic diagram showing the relationship between barium content and effective magnetic permeability, saturation magnetic flux density, and wear amount of Ba alloy. Figure 3 shows the relationship between strontium content and effective magnetic permeability, saturation magnetic flux density, and wear amount of 78.5% Ni-Fe-Sr alloy. A characteristic diagram showing the relationship with the amount, Figure 4 is 79%Ni-Fe-7%Nb-
A characteristic diagram showing the relationship between the amount of strontium, effective magnetic permeability, saturation magnetic flux density, and amount of wear in Sr alloy.
Characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when Cu, W, Nb, Ta, or Mn is added. Figure 6 is 78.5%.
Ni-Fe-1.0%Sr-1.2%Ba alloy with Mo, Co, Cr,
A characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when V or Ti is added. Figure 7 shows 78.5%Ni-Fe-1.0%.
Characteristic diagram showing the relationship between the amount of each element added and effective magnetic permeability, saturation magnetic flux density, and wear amount when Si, Ge, Ga, In, or Tl is added to Sr-1.2%Ba alloy,
Figure 8 shows the amounts of each element added when Al, Zr, Hf, Ce, Pt, Be, Sn, Sb, B or P are added to a 78.5% Ni-Fe-1.0% Sr-1.2% Ba alloy. FIG. 3 is a characteristic diagram showing the relationship between , effective magnetic permeability, saturation magnetic flux density, and amount of wear.

Claims (1)

[Claims] 1. Total weight ratio of 30 to 90% nickel, one or two of strontium and barium: 0.001
~5%, balance iron and small amounts of impurities,
A wear-resistant high permeability alloy for magnetic recording and reproducing heads, characterized by having a saturation magnetic flux density of 5000G or more. 2 Weight ratio of 30 to 90% nickel, one or two of strontium and barium, total 0.001
Up to 5% copper, up to 15% each of tungsten, niobium, tantalum, and manganese, up to 10% each of molybdenum and cobalt, and up to 5% each of chromium, vanadium, titanium, silicon, germanium, gallium, indium, and thallium. below,
3% or less each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements, and 2% or less each of beryllium, tin, antimony, boron, and phosphorus, total of 0.01 to 30
%, the balance being iron and a small amount of impurities, and having a saturation magnetic flux density of 5000 G or more. 3 Total weight ratio of 30 to 90% nickel, one or two of strontium and barium 0.001
~5%, the balance iron and a small amount of impurities, in a non-oxidizing atmosphere or in vacuum at a temperature of 600℃ or higher and lower than the melting point for at least 1 minute.
For a magnetic recording/reproducing head, which is characterized by being heated for an appropriate time corresponding to the composition for 100 hours or less, and then cooling from 600°C or higher to room temperature at an appropriate rate corresponding to the composition, from 100°C/sec to 1°C/hour. Method for producing wear-resistant high permeability alloys. 4 Weight ratio of 30 to 90% nickel, one or two of strontium and barium, total 0.001
~5%, the balance iron and a small amount of impurities is heated at a temperature above 600°C and below the melting point in a non-oxidizing atmosphere or in vacuum for at least 1 minute.
After heating for an appropriate time corresponding to the composition for 100 hours or less, cooling from 600℃ or higher to room temperature at an appropriate rate corresponding to the composition of 100℃/sec to 1℃/hour, and then cooling it to room temperature at a temperature of 600℃ or less. 1. A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, which comprises heating the alloy in a neutral atmosphere or in a vacuum for an appropriate period of time corresponding to the composition, from 1 minute to 100 hours, and then cooling. 5 Weight ratio of 30 to 90% nickel, one or two of strontium and barium, total 0.001
A magnetic recording/reproducing head characterized in that it uses an alloy consisting of ~5% iron, the balance being iron and a small amount of impurities.