JPH02153052A - Manufacture of wear resistant high permeability alloy for magnetic recording/reproducing head and magnetic recording/reproducing head - Google Patents

Abstract

PURPOSE:To obtain a high permeability alloy for magnetic recording/reproducing head excellent in magnetic properties in A.C. magnetic fields and wear resistance and easy to forging by subjecting a rolled sheet of an alloy prepared by adding specific elements as accessory components to an Fe-Ni alloy with a specific composition to heat treatment under specific conditions. CONSTITUTION:A ferrous alloy having a composition containing, by weight, 30-90% Ni and 0.001-5%, in total, of Sr and/or Ba is melted in a nonoxidizing atmosphere, to which 0.01-30%, in total, of one or more kinds among <=30% Cu, <=15% each of W, Nb, Ta, and Mn, <=10% each of Mo and Co, <=5% each of Cr, V, Ti, Si, etc., <=3% each of Al, Zr, Hf, etc., and <=2% each of Be, Sn, Sb, B, and P are added as accessory components. An ingot of the above alloy is rolled into sheet-like state, and this sheet is heated in a nonoxidizing atmosphere up to a temp. between 600 deg.C and the melting point for 1min-10hr and cooled from >=600 deg.C down to ordinary temp. at a cooling rate in a wide range between 100 deg.C/sec and 1 deg.C/hr and, further, heated in a nonoxidizing atmosphere at <=600 deg.C for 1min-100hr, if necessary, and cooled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing 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 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 the magnetic tapes must slide in contact with each other. Therefore, it is desired that the wear resistance be good. Currently, Sendust (
Fe-5i-Al alloy) and ferrite (MnO-
However, since ZnOFezO1) is extremely hard and brittle, it is impossible to forge or roll it, and 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 magnetic permeability,
The disadvantage is that the saturation magnetic flux density is small at 5000 C or higher. 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 have conducted numerous studies on improving the magnetic properties and wear resistance of Ni-Fe alloys, and have found that the total amount of one or two of the Ua group elements strontium and barium in Ni-Fe alloys is 0.001. The objective was achieved by adding ~5% and secondary ingredients.

The features of the present invention are as follows.

The first invention weight ratio is 30 to 90% nickel, a total of one or two of strontium and barium o, ooi to 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 and tungsten.

15% or less each of niobium, tantalum, and manganese; 10% or less each of molybdenum and cobalt; chromium, vanadium, titanium, silicon, and germanium.

5% or less of each of gallium, indium, and thallium,
Aluminum, zirconium, hafnium.

An alloy containing a total of 0.01 to 30% of one or more of 3% or less of rare earth elements and platinum group elements, and 2% or less of each of beryllium, tin, antimony, boron, and phosphorus at 600°C. 10 minutes in a non-oxidizing atmosphere or vacuum at a temperature below the melting point for at least 1 minute.
After heating for an appropriate time corresponding to the composition of 0 hours or less,
A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, which comprises cooling from a temperature of 0°C or higher to room temperature at an appropriate rate corresponding to the composition of 100°C/sec to 1°C/hour.

Second invention weight ratio: nickel 30 to 90%, total of one or two of strontium and barium o, oot to 5%,
The soil component is an alloy consisting of a small amount of impurities and the balance iron, and the subcomponents are less than 30% copper and tungsten.

15% or less each of niobium, tantalum, and manganese; 10% or less each of molybdenum and cobalt; 5% or less each of chromium, vanadium, titanium, silicon, germanium, gallium, indium, and thallium; aluminum, zirconium, and hafnium.

An alloy containing a total of 0.01 to 30% of one or more of 3% or less of rare earth elements and platinum group elements, and 2% or less of each of beryllium, tin, antimony, boron, and phosphorus at 600°C. 100°C for at least 1 minute in a non-oxidizing atmosphere or in vacuum at a temperature below the melting point.
After heating for an appropriate time corresponding to the composition of 600 hrs.
℃ or higher at an appropriate rate corresponding to the composition of 100"C/sec to 1℃/hour, and then further cooled to room temperature for 60"C/sec to 1℃/hour.
A method for producing a wear-resistant high permeability alloy for a magnetic recording/reproducing head, which comprises heating at a temperature of 0° C. or lower in a non-oxidizing atmosphere or in a vacuum for 1 minute or more and 100 hours or less, and cooling.

The third invention weight ratio is 30 to 90% nickel, a total of 0.001 to 5% of one or two of strontium and barium,
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 and tungsten.

15% or less each of niobium, tantalum, and manganese; 10% or less each of molybdenum and cobalt; chromium, vanadium, titanium, silicon, and germanium.

5% or less of each of gallium, indium, and thallium,
Aluminum, zirconium, hafnium.

An alloy containing a total of 0.01 to 30% of one or more of 3% or less of rare earth elements and platinum group elements, and 2% or less of each of beryllium, tin, antimony, boron, and phosphorus was used. Rad for magnetic recording and playback.

To make the alloy of the present invention, first the main component nickel 30~
90%, one or two of strontium and barium
After melting a suitable amount of O, oot ~ 5% of the total amount of iron and the remaining iron in a non-oxidizing atmosphere or in a vacuum using an appropriate melting furnace, a small amount of an appropriate deoxidizing agent and desulfurizing agent is added. Remove impurities as much as possible, and add 30% or less copper, 15% or less each of tungsten, niobium, tantalum, and manganese, 10% or less each of molybdenum, cobalt, chromium, vanadium, titanium, and silicon.

5% or less each of germanium, gallium, indium, and thallium; 3% or less each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements; 2% each of beryllium, tin, antimony, boron, and phosphorus.
Add one or more of the following in a total amount of 0.01 to 30% and stir thoroughly to obtain 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 further heated to a high temperature and subjected to forming processes such as hot forging, hot rolling, and cold rolling to achieve the desired shape. For example, make a thin plate with a thickness of 0.1 mm.

Next, a piece of the desired shape and size is punched out from the thin plate and heated in an appropriate non-oxidizing atmosphere or vacuum to a temperature above the recrystallization temperature, that is, about 600°C or above, especially above 800°C below the melting point, for 1 minute. Heating is performed for at least 100 hours, and then at an appropriate rate depending on the composition, e.g. 100"C/sec~
Cool at 1°C/hour. Depending on the composition of the alloy, this may be further heated to a temperature of about 600 °C or below (temperature below the ordered lattice-irregular lattice transformation point), particularly 200 to 600 °C for 1 minute or more and 100 hours or less, and then cooled to increase the saturation magnetic flux density. 50,000 or more, it is possible to obtain a high permeability magnetic alloy with excellent wear resistance.

From the above solution temperature to the regular-disordered lattice transformation point (approximately 60
When cooling to a temperature of 0° C. or higher, there is no significant difference in the magnetism obtained whether the material is rapidly cooled or slowly cooled, but the cooling rate below this transformation point has a large effect on the magnetism. In other words, by cooling from a temperature above this transformation point 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 cooling rate is rapidly cooled at a rate close to 100"67 seconds, the degree of order will decrease, and if the cooling rate is faster than this, order will not progress, and the degree of order will further decrease and the magnetism will deteriorate.However, the degree of order will decrease. When an alloy with a small temperature is reheated to 200°C to 600°C below its transformation point and cooled, ordering progresses to a suitable degree of order and improves 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.

Tip rattan open earth alloy number 42 (composition Ni-79.0%, Zn-0.7%
.

5r-1.5%, Ba-1.0%, balance Fe) To make a sample, put a total weight of 800 g of the alloy material with the above composition into an alumina crucible, melt it in a high-frequency induction electric furnace in a vacuum, and then stir well. It was made into a molten alloy.

This was then poured into a mold with a hole of 25 mm in diameter and 170 tatn in height, and the resulting ingot was forged at about 1000°C to form a plate with a thickness of about 711I111. Approximately 60 more
Hot rolled at 0 to 900"C to a thickness of 1 mm, 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 mrn and a magnetic head core were punched out. Next, these were subjected to various heat treatments shown in Table 1, the annular plate was used to test the magnetic properties, the core was used to manufacture a magnetic head, and a surface roughness meter was used to test the magnetic tape (CrOt) for 200 hours. The amount of wear afterwards was measured and the results shown in Table 1 were obtained.

Next, Table 2 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 typical alloys measured at room temperature are shown.

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%Ni
-The relationship between the amount of Ba added, effective magnetic permeability, saturation magnetic flux density, and wear amount for Fe-Ba alloy is shown in Figure 2.
The relationship between the amount of Ba added and the effective magnetic permeability, saturation magnetic flux density, and wear amount for a 9% Ni-Fe7% Nb-Ba alloy is shown.

Figure 3 shows S for 78.5%Ni-Fe-Sr alloy.
The relationship between the r addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount is shown in Figure 4.
The relationship between the Sr addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount for Sr alloys is shown.

Figure 5 shows 78.5%Ni-Fe-1,0%5r-1,2
The relationship between the amount of each element added and effective magnetic permeability, saturation magnetic flux density, and wear amount when Cu, W, Nb, Ta, or Mn is added to a %Ba alloy is shown.

Figure 6 shows 78.5%Ni-Fe-1,0%5r-12%
The relationship between the amount of each element added and effective magnetic permeability, saturation magnetic flux density, and wear amount when Mo, Co, Cr, V, or Ti is added to a Ba alloy is shown.

Figure 7 shows 78.5%Ni-Fe 1.0%5r-1,
2% Ba alloy with Si, Ge, Ga, In, or Tf.

The relationship between the amount of each element added and the effective magnetic permeability, saturation magnetic flux density, and amount of wear is shown below.

Figure 8 shows 78.5%Ni-Fe-1,0%5r-1,2
%Ba alloy A/2. Zr, Hf, Ce, Pt or B
The relationship between the amount of each element added, effective magnetic permeability, saturation magnetic flux density, and wear amount when e, Sn, Sb, B, or P is added is shown.

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 the magnetic properties of the present invention is due to the desulfurization effect of strontium and barium during melting, which removes impurities and cleans the alloy structure. Since it forms a good cubic crystal, it is thought that the magnetocrystalline anisotropy energy is small (which makes it easy to magnetize. Furthermore, Ni-3r system, Fe-3r system, N
Since i-Ba and Fe-Ba intermetallic compounds are finely precipitated, dividing the magnetic domain and increasing the domain walls, the moving speed of the domain walls in an alternating magnetic field is relatively reduced, and therefore eddy current loss is reduced. It is thought that a large effective magnetic permeability can be obtained. Furthermore, the improvement in wear resistance of the alloy of the present invention is due to
This is thought to be due to the fact that when strontium or barium, which has a large interatomic distance, is added, the base of the N i -Fe alloy is solid solution hardened and a strong intermetallic compound is finely precipitated on the base.

Furthermore, Cu, W, and Nb are added as subcomponents.

Ta, Mn, Mo, Co, Cr, V, Ti, Ce.

Ga, In, Ti! , Affi, Si, Zr, Hf rare earth elements, platinum group elements, Be, Sn, Sb, B and 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. Further C
u, W, Nb, V, Ti, Ge.

In, Tffi, Affi, Si, Z
r, Hf rare earth element;

Platinum group elements such as Be, Sn, Sb, B and P have a great effect on improving the wear resistance of the alloy of the present invention, and Nb,
Ta, Mn, Ti, Si, and rare earth elements are highly effective in improving forging workability.

In short, the alloy of the present invention has a saturation magnetic flux density of 50,000 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 for use in 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 structure of the alloy is 30 to 90% nickel.
, strontium or barium in total of 0.001 to 5% and the balance iron, and the elements to be added are w430% or less, tungsten, niobium, tantalum, manganese each 15% or less, molybdenum , less than 10% each of cobalt, chromium, vanadium, titanium, and silicon.

5% or less each of germanium, gallium, indium, and thallium; 3% or less each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements; 2% each of beryllium, tin, antimony, boron, and phosphorus.
The reason for limiting the total amount of one or more of the following to 0.01 to 30% is that the saturation magnetic flux density in the composition range is clear from Examples, Table 2, and Figures 1 to 8 of the drawings. is 5000 G or less, it has excellent effective magnetic permeability and wear resistance, and has good workability, but if the composition is outside this range, the saturation magnetic flux density will be 5000 G or less, the effective magnetic permeability will decrease, and wear will be reduced. This is because it becomes large and 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 effect of addition is small, and if it exceeds 5%, forging becomes difficult. In addition, the subcomponents include less than 30% copper, 15% tungsten, 15% niobium, 15% tantalum, 15% manganese, 10% molybdenum, 5% chromium, 5% vanadium, 5% titanium, 5% germanium, and 5% gallium. , indium 5%, thallium 5%,
This is because adding more than 3% aluminum, 5% silicon, 3% hafnium, 3% rare earth elements, and 3% platinum group elements will result in a saturation magnetic flux density of 5000 G or less; %, antimony 2%, boron 2%, and phosphorus 2%, it becomes difficult to forge or process.
This is because if more than 0% is added, the effective magnetic permeability decreases.

As is clear from Table 2, 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. In addition, rare earth elements consist of scandium, yttrium, and lanthanum-based elements, but the effects of adding these subcomponents are exactly the same, and platinum group elements include platinum, iridium, ruthenium, rhodium, and palladium.

Although it is made of osmium, its effects are 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%Nt-Fe-Ba alloy. A 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 Figure 4 is a characteristic diagram showing the relationship between the amount of wear and the amount of strontium in the 79%Ni-Fe-7%Nb-3r alloy, effective magnetic permeability, saturation magnetic flux density, and wear. Figure 5 shows 78.5%Ni-Fe-1,0%5r-1,
2% Ba alloy with Cu, W, Nb, Ta or Mn
The relationship between the amount of each element added and the effective magnetic permeability, saturation magnetic flux density, and amount of wear is shown below. Figure 6 shows 78.5%Ni-Fe-1,0%5r-1,2
%Ba alloy with Mo, Co, Cr, 'V or T
The relationship between the amount of each element added and effective magnetic permeability, saturation magnetic flux density, and wear amount when i is added is shown. Figure 7 shows 78.5%Ni-Fe-1,0%5r-1,2
%Ba alloy with Si, Ge, Ga, In, or Tffi. The relationship between the amount of each element added and the effective magnetic permeability, saturation magnetic flux density, and amount of wear is shown below. Figure 8 shows 78.5%Ni-Fe-1,0%5r-1,2
%Ba alloy to Aj! , Zr 2 , Hf 2 , Ce 2 , PL, Be, Sn, Sb, B, or P are added, and the relationship between the amount of each element added and the effective magnetic permeability, saturation magnetic flux density, and amount of wear is shown. X fO' Figure 1 Figure 3 S, (%) xfO' Figure 2 Figure 4 Sr (%) Figure 5 Figure 7 Si, Ge, Ga, InorTl (%) Figure 6 Mo, Co, Cr , V or Ti (%) 8th
figure

Claims (3)

[Claims] 1. Total weight ratio of 30 to 90% nickel, one or two of strontium and barium 0.001 to 5
%, the main component is an alloy consisting of a small amount of impurities and the balance iron,
Copper 30% or less, tungsten, niobium, tantalum, manganese each 15% or less, molybdenum,
Less than 10% each of cobalt, chromium, vanadium,
Up to 5% each of titanium, silicon, germanium, gallium, indium, and thallium; up to 3% each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements; up to 2% each of beryllium, tin, antimony, boron, and phosphorous; Total of 1 type or 2 or more types: 0.
After heating an alloy containing 01 to 30% 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 of at least 1 minute or more and 100 hours or less, 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. 2. Total weight ratio of 30 to 90% nickel, one or two of strontium and barium 0.001 to 5
%, the main component is an alloy consisting of a small amount of impurities and the balance iron,
Copper 30% or less, tungsten, niobium, tantalum, manganese each 15% or less, molybdenum,
Less than 10% each of cobalt, chromium, vanadium,
Up to 5% each of titanium, silicon, germanium, gallium, indium, and thallium; up to 3% each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements; up to 2% each of beryllium, tin, antimony, boron, and phosphorous; Total of 1 type or 2 or more types: 0.
After heating an alloy containing 01 to 30% in a non-oxidizing atmosphere or in vacuum at a temperature of 600°C or higher and lower than the melting point for at least 1 minute to 100 hours, the alloy is heated at a temperature of 600°C or higher and From temperature to 100℃/sec
Cool to room temperature at an appropriate rate corresponding to the composition at 1°C/hour, then further heat at a temperature of 600°C or less in a non-oxidizing atmosphere or in a vacuum for 1 minute or more and 100 hours or less, and then cool. A method for manufacturing a wear-resistant high permeability alloy for magnetic recording/reproducing heads. 3. Total weight ratio of 30 to 90% nickel, one or two of strontium and barium 0.001 to 5
%, the main component is an alloy consisting of a small amount of impurities and the balance iron,
Copper 30% or less, tungsten, niobium, tantalum, manganese each 15% or less, molybdenum,
Less than 10% each of cobalt, chromium, vanadium,
Up to 5% each of titanium, silicon, germanium, gallium, indium, and thallium; up to 3% each of aluminum, zirconium, hafnium, rare earth elements, and platinum group elements; up to 2% each of beryllium, tin, antimony, boron, and phosphorous; Total of 1 type or 2 or more types: 0.
A magnetic recording/reproducing head using an alloy containing 0.01 to 30%.