JPH0368107B2 - - Google Patents

Description

[Detailed description of the invention]

(Field of Industrial Application) The present invention relates to a high magnetic permeability alloy that has excellent magnetic properties and wear resistance in an alternating magnetic field, is easy to forge, and is suitable for magnetic recording/reproducing heads, and a method for manufacturing the same. (Prior Art) Since magnetic recording/reproducing heads such as tape recorders operate in alternating magnetic fields, the magnetic alloys used therein are required to have high effective magnetic permeability in high-frequency magnetic fields, and the magnetic tape is It is desired that the wear resistance is good because it slides on the surface. Currently, Sendust (Fe-
(Si-Al alloy) and ferrite (MnO-ZnO
−Fe ₂ O ₃ ). (Problems to be Solved by the Invention) However, these alloys are extremely hard and brittle, making it impossible to forge or roll them. Grinding and polishing methods are used to manufacture head cores. The finished product is 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. Furthermore, although ferrite has a high effective magnetic permeability, its drawback is that its saturation magnetic flux density is low at 5000G or less. 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
This objective was achieved by adding a total of 0.001 to 5% of one or both of group B elements zinc and cadmium to the Ni-Fe alloy. (Means for Solving the Problems) The features of the present invention are as follows. First invention Consists of 30-90% nickel by weight, 0.001-5% in total of one or two of zinc and cadmium, a small amount of impurities and the balance iron, saturation magnetic flux density
A wear-resistant high permeability alloy for magnetic recording/reproducing heads characterized by having a strength of 5000G or more. 2nd invention The main component is an alloy consisting of 30 to 90% nickel by weight, a total of 0.001 to 5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% or less of copper as a subcomponent. , 20% or less of each of tungsten and tantalum, niobium, manganese,
15% or less of each of chromium, 10% or less of each of molybdenum, vanadium, gold, and cobalt, 5% or less of each of titanium, silicon, germanium, gallium, indium, thallium, strontium, barium, and platinum group elements, aluminum, zirconium, and hafnium , silver, rare earth elements, beryllium, tin, antimony, each of 3% or less, boron, phosphorous, each of 2% or less, in total of 0.01 to 30%, and has a saturation magnetic flux density of 5000G or more. A wear-resistant high permeability alloy for magnetic recording/reproducing heads, characterized by having: Third invention: An alloy consisting of 30 to 90% nickel by weight, a total of 0.001 to 5% of one or both of zinc and cadmium, a small amount of impurities, and the balance iron, is non-oxidized at a temperature of 600°C or higher and lower than the melting point. After heating for at least 1 minute to 100 hours in a neutral atmosphere or vacuum for an appropriate time corresponding to the composition, heat from a temperature of 600°C or higher at an appropriate rate of 100°C/sec to 1°C/hour depending on the composition. A method for manufacturing a wear-resistant high permeability alloy for magnetic recording/reproducing heads, which is characterized by cooling to room temperature. 4th Invention An alloy consisting of 30 to 90% nickel by weight, 0.001 to 5% in total of one or both of zinc and cadmium, a small amount of impurities, and the balance iron, is non-oxidized at a temperature of 600°C or higher and lower than the melting point. After heating for at least 1 minute to 100 hours in a neutral atmosphere or vacuum for an appropriate time corresponding to the composition, heat from a temperature of 600°C or higher at an appropriate rate of 100°C/sec to 1°C/hour depending on the composition. Cool to room temperature and heat for another 600 ml.
1. A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, which comprises heating the alloy at a temperature of 0.degree. (Function) To produce the alloy of the present invention, first, 30 to 90% of nickel as the main component, a total of 0.001 to 5% of one or both of zinc and cadmium, and an appropriate amount of the balance iron in a non-oxidizing atmosphere or After melting in a vacuum using an appropriate melting furnace, add a small amount of an appropriate deoxidizing agent and desulfurizing agent to remove as much impurity as possible.
As it is, or in addition, 30% or less copper, 20% or less each of tungsten and tantalum, 15% or less each of niobium, manganese, and chromium, molybdenum,
10% or less each of vanadium, gold, and cobalt,
Titanium, silicon, germanium, gallium, indium, thallium, strontium, barium,
5% or less each of platinum group elements, aluminum,
3% or less each of zirconium, hafnium, silver, rare earth elements, beryllium, tin, and antimony,
One or two types of boron and phosphorus each with 2% or less
A total amount of 0.01 to 30% of the seeds or more is added and thoroughly stirred to create 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. Build a thin plate with a thickness of 0.1mm. Next, punch out a piece of the desired shape and size from the thin plate, and heat it in a suitable non-oxidizing atmosphere (hydrogen, argon, nitrogen, etc.) or in vacuum at a temperature above the recrystallization temperature, that is, about 600°C or above, especially 800°C. It is heated to a temperature above the melting point or below for 1 minute or more, and then cooled at an appropriate rate depending on the composition, for example, 100° C./second to 1° C./hour. Depending on the composition of the alloy, this may be further heated to a temperature of about 600℃ or below (temperature below the ordered lattice-irregular lattice transformation point), especially 200 to 600℃ for 1 minute or more.
By heating for less than an hour 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 solution temperature to a temperature above the ordered-irregular lattice transformation point (approximately 600°C) shows that there is no significant difference in the magnetic properties obtained whether the cooling is rapid or gradual; The following cooling rates have a significant effect on magnetism. In other words, from the 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 appropriately adjusted 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. (Example) Next, an example of the present invention will be described. Example 1 Alloy number 17 (composition Ni-79.0%, Zn-1.0%, Cd
-1.0%, balance Fe) To make a 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 an argon atmosphere using a high frequency induction furnace, followed by thorough stirring to obtain a homogeneous molten alloy. Next, make this 25mm in diameter and height
The ingot was poured into a mold with a 170 mm hole, and the resulting ingot was forged at approximately 1100°C to form a plate approximately 7 mm thick. Furthermore, it is hot rolled at approximately 600 to 900℃ to a thickness of 1 mm.
Then cold rolled at room temperature to make a 0.1mm thin plate.
Then, an annular plate with an outer diameter of 45 mm and an inner diameter of 33 mm and a magnetic head core were punched out. Next, add these to the first
After applying the various heat treatments shown in the table, the annular plate was used to measure the magnetic properties, and the core was used to manufacture a magnetic head, and a surface roughness meter was used to measure the amount of wear after 200 hours of running on magnetic tape (CrO ₂ ). The results shown in Table 1 were obtained.

【table】

[Table] Example 2 Alloy number 66 (composition Ni-79.0%, Zn-0.7%, Cd
-1.2%, Nb -7.0%, balance Fe) Total weight of alloy material with the above composition to make the sample.
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℃ for 2 hours, cooling from 600℃ to room temperature at various speeds, or further heating at a temperature below 600℃, The properties of representative alloys measured at room temperature are shown.

【table】

[Table] Next, the effect of adding zinc and cadmium to the alloy of the present invention will be described in detail with reference to the drawings. 1st
Figure 2 shows the relationship between Zn addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount for 78.5%Ni-Fe-Zn alloy.
The relationship between the amount of Zn added and the effective magnetic permeability, saturation magnetic flux density, and wear amount of the alloy was shown. Figure 3 shows Cd for 78.5%Ni-Fe-Cd 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 Cd added and the effective magnetic permeability, saturation magnetic flux density, and wear amount for Nb-Cd alloys was shown. Figure 5 shows the amount of each element added, effective magnetic permeability, saturation magnetic flux density and amount of wear when Cu, W, Ta, Nb or Mn is added to a 79.0%Ni-Fe-1.0%Zn-1.0%Cd alloy. shows the relationship between Figure 6 shows the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and amount of wear when Cr, Mo, V, Au, or Co is added to a 79.0% Ni-Fe-1.0% Zn-1.0% Cd alloy. shows the relationship between Figure 7 shows the amount of each element added and the effective effect when Ti, Si, Ge, Ga, In, Tl, Sr, Ba, Pt or Al is added to a 79.0%Ni-Fe-1.0%Zn-1.0%Cd alloy. The relationship between magnetic permeability, saturation magnetic flux density, and amount of wear is shown. Figure 8 shows the amount of each element added and the effective magnetic permeability when Zr, Hf, Ag, Ce, Be, Sn, Sb, B or P is added to a 79.0%Ni-Fe-1.0%Zn-1.0%Cd alloy. , shows the relationship between saturation magnetic flux density and amount of wear. Generally, as the amount of zinc or cadmium added increases, the effective magnetic permeability increases significantly and the amount of wear decreases. However, if the zinc and cadmium content exceeds 5%, processing becomes difficult, which is not preferable. The improvement in magnetic properties of the present invention is due to the deoxidation and desulfurization effects of zinc and cadmium during melting, which remove impurities and clean the alloy structure, and the addition of zinc and cadmium improves saturation magnetostriction and It is thought that the magnetocrystalline anisotropy energy becomes smaller and the state becomes easier to magnetize. In addition, Ni-Zn, Fe-Zn, Ni-Cd, and Fe-Cd intermetallic compounds precipitate finely, dividing the magnetic domain and increasing the domain wall, so the relative movement speed of the domain wall in an alternating magnetic field is It is believed that this reduces the eddy current loss and provides a large effective magnetic permeability. Furthermore, the wear resistance of the alloy of the present invention is improved by solid solution hardening of the Ni-Fe alloy base when zinc or cadmium is added.
This is thought to be due to the fine precipitation of strong intermetallic compounds on the ground, further improving corrosion resistance. Furthermore, Cu, W, Nd, which are added as subcomponents,
Ta, Mn, Mo, V, Au, Co, Cr, Ti, Ge,
Ga, In, Tl, Sr, Ba, Al, Si, Zr, Hf, Ag,
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, Au,
Ti, Ge, Ga, In, Tl, Sr, Ba, Al, Si, Zr,
Hf, Ag, 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 Sr, Ba, Nb, Ta, etc.
Mn, Ti, Si, and rare earth elements have a large effect on improving forging workability. Next, in the present invention, the composition of the alloy is changed from Nickel 30 to
90%, a total of 0.001 to 5% of one or two of zinc or cadmium, and the balance iron, and the elements added to this are limited to 30% or less copper, 20% or less each of tungsten and tantalum, niobium, manganese,
15% or less of each of chromium, 10% or less of each of molybdenum, vanadium, gold, and cobalt, 5% or less of each of titanium, silicon, germanium, gallium, indium, thallium, strontium, barium, and platinum group elements, aluminum, zirconium, and hafnium , silver, rare earth elements, beryllium, tin, antimony, each of 3% or less, boron, phosphorus, each of 2% or less, and the total of one or more types was limited to 0.01 to 30%.
As is clear from Table 3 and the drawings, the saturation magnetic flux density in this composition range is 5000G or more, which has excellent effective magnetic permeability and wear resistance, as well as good workability; however, when the composition falls outside this range, it saturates magnetic flux density
This is because if it becomes less than 5000G, the effective magnetic permeability decreases, wear increases, and machining becomes difficult, making it unsuitable as a material for magnetic recording/reproducing heads.
That is, if zinc and cadmium are less than 0.001%, the effect of addition is small, and if it exceeds 5%, casting becomes difficult. And this has 30% copper as a subcomponent.
Below, 20% tungsten, 15% niobium, tantalum
20%, manganese 15%, chromium 15%, molybdenum 10
%, vanadium 10%, gold 10%, titanium 5%, germanium 5%, gallium 5%, indium 5%,
Thallium 5%, Strontium 5%, Barium 5
This is because if more than 5% of platinum group elements are added, the saturation magnetic flux density becomes 5000G or less. This is because adding more than 3% beryllium, 3% tin, 3% antimony, 2% boron, and 2% phosphorus will make forging or processing difficult.
This is because adding more than 10% reduces the effective magnetic permeability. 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 regarded as the same effective ingredient. 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. In addition, carbon, nitrogen, oxygen, and sulfur improve wear resistance, and Te, Se, Bi, Ca, and Pb improve free machinability, so each should be added at 0.1 to an extent that does not impair magnetic properties.
% or less, it is effective, and there is no problem even if it is contained as an impurity in the alloy of the present invention. (Effects of the Invention) 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/playback heads, but also It is also very suitable as a magnetic material for use in magnetic recording/reproducing heads for VTRs and computers, as well as ordinary electrical equipment.

[Brief explanation of drawings]

Figure 1 is a characteristic diagram showing the relationship between zinc content, effective magnetic permeability, saturation magnetic flux density, and wear amount of 78.5%Ni-Fe-Zn alloy, and Figure 2 is 79%Ni-Fe-7%Nb-Zn.
Characteristic diagram showing the relationship between the amount of zinc in the alloy, effective magnetic permeability, saturation magnetic flux density, and amount of wear. Figure 3 is for 78.5%Ni.
-Characteristic diagram showing the relationship between the amount of cadmium in the Fe-Cd alloy, effective magnetic permeability, saturation magnetic flux density, and amount of wear,
Figure 4 is a characteristic diagram showing the relationship between the amount of cadmium, effective magnetic permeability, saturation magnetic flux density, and wear amount of 79%Ni-Fe-7%Nb-Cd alloy, and Figure 5 is a characteristic diagram showing the relationship between cadmium content, effective magnetic permeability, saturation magnetic flux density, and amount of wear for 79%Ni-Fe-79.0%Nb-Cd alloy.
Fe-1.0%Zn-1.0%Cd alloy with Cu, W, Ta, and Nb
Or a characteristic diagram showing the relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when Mn is added. Figure 6 is 79.0%Ni-Fe-1.0%Zn
A characteristic diagram showing the relationship between the amount of each element added and effective magnetic permeability, saturation magnetic flux density, and wear amount when Cr, Mo, V, Au, or Co is added to -1.0% Cd alloy,
Figure 7 shows the amount of each element added and the effective effect when Ti, Si, Ge, Ga, In, Tl, Sr, Ba, Pt or Al is added to a 79.0%Ni-Fe-1.0%Zn-1.0%Cd alloy. Characteristic diagram showing the relationship between magnetic permeability, saturation magnetic flux density and wear amount, Figure 8 is 79.0%Ni-Fe-1.0%Zn-1.0
%Cd alloy with Zr, Hf, Ag, Ce, 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.

Claims (1)

[Claims] 1. 30 to 90% nickel by weight, 0.001 to 5% in total of one or two of zinc and cadmium,
Consisting of a small amount of impurities and the remainder iron, the saturation magnetic flux density
A wear-resistant high permeability alloy for magnetic recording/reproducing heads characterized by having a strength of 5000G or more. 2. Nickel 30-90% by weight, total of one or two of zinc and cadmium 0.001-5%,
The main component is an alloy consisting of a small amount of impurities and the balance iron, and the secondary components are less than 30% copper, less than 20% each of tungsten and tantalum, niobium, manganese,
15% or less of each of chromium, 10% or less of each of molybdenum, vanadium, gold, and cobalt, 5% or less of each of titanium, silicon, germanium, gallium, isodium, thallium, strontium, barium, and platinum group elements, aluminum, zirconium, and hafnium , silver, rare earth elements, beryllium, tin, antimony, each of 3% or less, boron, phosphorous, each of 2% or less, in total of 0.01 to 30%, and has a saturation magnetic flux density of 5000G or more. A wear-resistant high permeability alloy for magnetic recording/reproducing heads, characterized by having: 3. Nickel 30-90% by weight, total of one or two of zinc and cadmium 0.001-5%,
After heating an alloy consisting of a small amount of impurities and the balance iron in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or higher and below the melting point for an appropriate time corresponding to the composition for at least 1 minute or more and 100 hours or less, 1. A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, characterized in that the alloy is cooled from a temperature of 100° C./sec to 1° C./hour to room temperature at an appropriate rate corresponding to the composition. 4. Nickel 30-90% by weight, total of one or two of zinc and cadmium 0.001-5%,
After heating an alloy consisting of a small amount of impurities and the balance iron in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or higher and below the melting point for an appropriate time corresponding to the composition for at least 1 minute or more and 100 hours or less, From the temperature of
A method for producing a wear-resistant high permeability alloy for magnetic recording/reproducing heads, which comprises heating at a temperature of 600°C or less in a non-oxidizing atmosphere or vacuum for 1 minute or more for an appropriate time depending on the composition, and cooling. .