JPS6134160A - Wear resistant and high magnetic permeability alloy for magnetic record regenerating head, its manufacture and magnetic record regenerating head - Google Patents

Abstract

PURPOSE:To manufacture a high magnetic permeability alloy superior in magnetic characteristic in AC magnetic field and wear resistance, easy for forging and favorable to magnetic record regeneration head, by heat treating Ni-Fe alloy contg. Zn, Cd, etc. under a specified condition. CONSTITUTION:Ni-Fe alloy contg. 30-90% Ni, 0.001-5% total of one or two kinds of Zn, Cd, and the balance Fe, or said alloy further contg. respective quantities of Cu, W, Ta, the other auxiliary components is melted in vacuum or nonoxidizing atmosphere. The molten metal is cast in mold, the ingot is deformed to sheet by forging hot rolling, cold rolling, etc. The sheet is heated to 600 deg.C-m.p. for 1min-100hr in vacuum or nonoxidizing atmosphere such as Ar, H2, successively cooled from the temp. to normal temp. at 100-1 deg.C/sec rate. Or said sheet is heated at <=600 deg.C for >=1min to manufacture the titled alloy having >=5,000G saturated magnetic flux density and superior wear resistance.

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 producing the same. The present invention relates to a magnetic recording/reproducing head.

(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. It is desired that the wear resistance is good because it slides on the surface. Currently, Sendust (
Fe-5i-A/based alloy) and ferrite (MnO
-Zn0-Fe, 08).

(Problem to be solved by the invention) However, these alloys are extremely hard and brittle, making it impossible to forge or roll them.
Polishing methods are used and the products are 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. Further, 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 processed by forging, rolling and other processes.

Although die-cutting is easy and has excellent mass productivity, its major drawback is that it is 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
This objective was achieved by adding a total of 0.001 to 5% of one or both of the NB group elements strontium and barium to the B alloy.

(Means for Solving the Problems) The present invention has a weight ratio of 80 to 90% nickel, a total of 0.001% of one or two of strontium and barium.
~5%, with small amounts of impurities and the balance consisting of iron, or with iron as the main component, and secondary components of up to 80% copper, up to 20% each of tungsten and tantalum, up to 15% each of niobium, manganese, and chromium, and molybdenum. , less than 10% each of vanadium, gold, and cobalt, titanium, and silicon.

Germanium, gallium, indium, thallium.

5% each of strontium, barium, and platinum group elements
Below, aluminum, zirconium, hafnium, silver,
8 each of rare earth elements, beryllium, tin, and antimony
% or less, boron, phosphorus, each of 2% or less, totaling 0.01 to 30%, has a saturation magnetic flux density of 5000G or more, has excellent wear resistance and effective magnetic permeability, and is suitable for magnetic recording. The present invention relates to a high permeability magnetic alloy that can be used for playback heads and the like.

Furthermore, the present invention relates to a magnetic recording/reproducing head having excellent resistance to J' and '-, manufactured by using the above-mentioned high magnetic permeability alloy for the case, core, etc.

(Function) To make the alloy of the present invention, first the main component nickel 80~
90%, a total of 0.001 to 5% of one or two types of zinc and cadmium, and an appropriate amount of the balance iron in a non-oxidizing atmosphere or in a vacuum using a suitable melting furnace, and then a suitable decomposition process. Add a small amount of acid and desulfurization agent to remove as much impurity as possible, then add 30% copper as is or add 30% copper to this.
Below, 20% or less of each of tungsten and tantalum,
Up to 15% each of niobium, manganese, and chromium; up to 10% each of molybdenum, vanadium, gold, and cobalt; titanium, silicon, germanium, gallium, indium, thallium, and strontium.

5% or less each of barium, platinum group elements, aluminum, zirconium, hafnium r, rare earth F elements, 3% or less each of beryllium, tin, antimony, boron,
Total of 1 or 2 or more types of phosphorus, each less than 2% 0
．． 0.01 to 80% 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 both temperatures to form the desired shape. For example, a thin plate with a thickness of 0.1 mm is made.

Next, a piece of the desired shape and size is punched out from the thin plate, and it is heated in a suitable non-oxidizing atmosphere (hydrogen, argon, nitrogen, etc.) or in a vacuum at a temperature above the recrystallization temperature, that is, about
The alloy is heated to a temperature of 0°C or higher, particularly 800"C or higher and lower than the melting point, for 1 minute or more, and then cooled at an appropriate rate depending on the composition, for example, 100°C/sec to 1°C/hour. Depending on the composition of the alloy, this may be Further, at a temperature of about 600"C or less (temperature below the ordered lattice-irregular lattice transformation point), especially from 200 to 600"
C. for 1 minute to 100 hours and cooled, a high permeability magnetic alloy having a saturation magnetic flux density of 5000 G or more and excellent wear resistance can be obtained.

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 or slowly cooled, but a cooling rate below this transformation point has a large effect on the magnetism. That is, 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 degree of 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./sec among the above cooling rates, the degree of order decreases, and if it is cooled faster than this, the degree of order does not proceed, and the degree of order decreases further and the magnetism deteriorates. However, when an alloy with a low degree of order is reheated to 200° C. to 600° C. below its transformation point and cooled, ordering progresses and the degree of order becomes appropriate, 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, examples of the present invention will be described.

Example 1 Alloy number 17 (composition N1-q9.o%, Zn-1,0
%, 0d-1,0%, balance 1i'e) To make the sample, the total weight of the alloy material of the above composition, 800
g was put into an alumina crucible and melted in an alcohol in a high-frequency induction furnace, and then heated to a homogeneous molten alloy. Next, make this with a diameter of 25” x height of 1
The ingot was poured into a mold with 70 holes, and the resulting ingot was poured into a mold with 70 holes.
It was forged at 00°C to form a plate with a thickness of about 7 mrn. Further, it is hot-rolled at about 600 to 900°C to a thickness of lam, and then cold-rolled at room temperature to form a thin plate of 0.1 mm, which is then made into an annular plate with an outer diameter of 45111 mm and an inner diameter of 33 mm, and the core of the magnetic head. punched out.

Next, these were subjected to extensive heat treatment as shown in Table 1, and the magnetic properties were determined using the annular plate, and a magnetic head was manufactured using the core.After 200 hours, the magnetic tape (OrO The wear amount was measured and the results shown in Table 1 were obtained.

, Example 2 Alloy number 66 (composition Ni-79.0%, Zn-0.7%
, Qd -1.2%, Nb -7.0%, balance Fe) To make a sample, 800 g of the alloy material with the above composition was placed in an alumina crucible and melted in a high frequency induction electric furnace in a vacuum. The mixture was stirred thoroughly to form 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.

Next, Table 3 shows that after heating in a vacuum at 1150'C for 2 hours, cooling from 600°C to room temperature by rapid formation,
Alternatively, this is further reheated at a temperature of 600° C. or lower, and the typical properties of the alloy measured at room temperature are shown below.

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. Figure 1 shows 78.6
Figure 2 shows the relationship between the amount of Zn added and the effective magnetic permeability, saturation magnetic flux density, and wear amount for the 79%Ni-ire-7%Nb-Zn alloy. The relationship between effective magnetic permeability, saturation magnetic flux density and amount of wear is shown.

Figure 3 shows the relationship between the amount of Cd added, effective magnetic permeability, saturation magnetic flux density, and wear amount for 78.5%Ni-Fe-Cd alloy, and Figure 4 shows the relationship between 79%Ni-Fe-7 alloy. %
Nb-.

The relationship between the Cd addition amount, effective magnetic permeability, saturation magnetic flux density, and wear amount for Cd alloys is shown.

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.

It is thought that the improvement in magnetic properties of the present invention is due to the deoxidation and desulfurization effects of zinc and cadmium during melting, and the saturation magnetostriction and magnetocrystalline anisotropy energy become smaller, resulting in a state where magnetization becomes easier.

Furthermore, Ni-Zn series, Fe-Zn series, Ni-Cd
The Fe-Cd system and the Fe-Cd gold end-to-end compound precipitate finely, dividing the magnetic domain and increasing the domain wall, so the moving speed of the domain wall in an alternating magnetic field is relatively reduced, and therefore the eddy current loss is reduced. It is thought that a large effective magnetic permeability can be obtained. Furthermore, the wear resistance of the alloy of the present invention is improved because when zinc or cadmium is added, the base of the Ni-Fe alloy is solid solution hardened, and strong intermetallic compounds are finely precipitated on the base, further improving the corrosion resistance. This is thought to be due to

Furthermore, cul W # NbrT added as a subcomponent
a, Mll, MO, V, Au, co
, cr, Ti, ae.

Ga, In, Tj, Sr, Ba,
Al, Si, Zr, Hf.

Ag, rare earth elements, platinum group elements, Be, Sn
, Sb.

B, P, etc. have the effect of increasing the effective magnetic permeability of the alloy of the present invention, CO increases the saturation magnetic flux density, and Sl +
Zr + Hf + A9, rare earth element, platinum group element.

738, Sn, Sb, B and P have a great effect on improving the wear resistance of the alloy of the present invention, and Sr
, Ba.

Nb, Ta, Mn, Ti, Si + rare earth elements have a large effect on improving forging workability.

Next, in the present invention, the composition of the alloy is 80 to 90% nickel.
, a total of one or two of zinc or cadmium 0.00
1 to 5% and the balance iron, and the elements added to this are 30% or less copper, 20% or less each of tungsten and tantalum, and 15% each of niobium, manganese, and chromium.
% or less, molybdenum, vanadium, gold, cobalt each less than 10%, titanium, silicon, germanium, gallium.

Less than 5% each of indium, thallium, strontium, barium, platinum group elements, aluminum, zirconium, hafnium, silver, rare 1r4 element g.

The reason for limiting the total to 0.01 to 30% of one or more of 8% or less each of beryllium, tin, and antimony, and 2% or less each of boron and phosphorus is clear from the examples, Table 8, and the drawings. saturated 6B in its composition range, such as
The flux density is 5000G or more, which has excellent effective 6 magnetic coefficient and wear resistance, as well as good workability. However, if the composition is outside this range, the saturation magnetic flux density will be less than 5000G, and the effective magnetic permeability will decrease, causing wear. This is because it becomes large and difficult to process, making it unsuitable as a material for magnetic recording/reproducing heads. That is, zinc and cadmium are 0.0
If it is less than 0.01%, the effect of addition is small, and if it exceeds 5%, forging becomes difficult. And 80% copper as a subcomponent
Below: 20% tungsten, 15% niobium, 20% tantalum, 15% manganese, 15% chromium, molybdenum
θ%, 10% vanadium, 10% gold, 5% titanium, 5% germanium, 5% gallium, 5% indium, 5% thallium, 5% strontium, 5% barium, and 5% platinum group elements. Saturation magnetic flux density is 50
00G or less, 3% zirconium, 8% silver
%, silicon 5%, aluminum 3%, hafnium 8%,
This is because if the addition exceeds 8% of rare earth elements, 3% of beryllium, 3% of tin, 3% of antimony, 2% of boron, and 2% of phosphorus, it becomes difficult to forge or process.
This is because adding more than 10% of the amount reduces the effective magnetic permeability.

As is clear from Table 3, if any of the Hl-Bre thread alloy alloy components is added, the effective magnetic permeability will further increase, the hardness will also increase, and the wear resistance will be improved. The ingredients have the same effects and can be considered as ingredients 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,
It is composed of iridium, ruthenium, rhodium, palladium, and osmium, but its effects are exactly the same.

In addition, carbon, nitrogen, oxygen and sulfur improve wear resistance,
Since Te, Se, Bi, ca, and pb improve free machinability, they are each added to a level of 0.0000 to an extent that does not impair magnetic properties.
It is effective if it is 1% or less, and there is no problem even if it is contained as an impurity in the alloy of the present invention.

/XHH's thoughts) As described above, the effective magnetic permeability is high, the wear resistance is excellent, and the workability is good, so it is not only suitable as a magnetic alloy for magnetic recording heads, but also for magnetic recording and reproduction of VTRs and electronic computers. It is also very suitable as a magnetic material for use in heads and 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 a 79%Ni-pe-7%Nb- A characteristic diagram showing the relationship between zinc content and effective magnetic permeability, saturation magnetic flux density, and wear amount of Zn alloy. Figure 8 shows the relationship between cadmium content and effective magnetic permeability, saturation magnetic flux density, and Figure 4 is a characteristic diagram showing the relationship between the amount of cadmium and the effective magnetic permeability, the saturation magnetic flux density, and the amount of wear of a 79%Ni-Fe-7%Nb-Cd alloy. Figure 1 Figure 2 Figure 3 Cd ('l) Figure 4 Cd (%)

Claims (1)

[Claims] 1. Consisting of 80-90% nickel by weight, 0.001-5% in total of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and has a saturation magnetic flux density of 5000 G or more A wear-resistant high permeability alloy for a magnetic recording/reproducing head, characterized by having: 2. 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% copper as a subcomponent. Below, 20% or less each of tungsten and tantalum, 15% or less each of niobium, manganese, and chromium, 10% or less each of molybdenum, vanadium, gold, and cobalt, titanium, silicon, germanium,
5% or less of each of gallium, indium thallium, strontium, barium, platinum group elements, aluminum,
3% or less each of zirconium, hafnium, silver, rare earth elements, beryllium, tin, and antimony, and 2% or less each of boron and phosphorus, total of one or more of 0.0
1 to 30%, and has a saturation magnetic flux density of 5000 G or more. 3. An alloy consisting of 30 to 90% nickel, a total of 0.001 to 5% of one or both of zinc and cadmium, a small amount of impurities, and the balance iron at a temperature above 600°C and below the melting point. After heating in an oxidizing atmosphere or vacuum for an appropriate time corresponding to the composition for at least 1 minute to 100 hours, 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 producing a wear-resistant high permeability alloy for magnetic recording/reproducing heads, which is characterized by cooling to room temperature at room temperature. 4. The main component is an alloy consisting of 30-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% copper as a secondary component. Below, 20% or less each of tungsten and tantalum, 15% or less each of niobium, manganese, and chromium, 10% or less each of molybdenum, vanadium, gold, and cobalt, titanium, silicon, germanium,
5% or less each of gallium, indium, thallium, strontium, barium, and platinum group elements; 3% or less each of aluminum, zirconium, hafnium, silver, rare earth elements, beryllium, tin, and antimony; and 2% or less each of boron and phosphorus. 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. 5. An alloy consisting of 30-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities, and the balance iron is non-oxidized at a temperature above 600°C and below the melting point. After heating for an appropriate time corresponding to the composition for at least 1 minute or more and less than 100 hours in a neutral atmosphere or vacuum, it is
Cool to room temperature at an appropriate rate corresponding to the composition in °C/hour,
A wear-resistant high permeability alloy for magnetic recording/reproducing heads, which is further heated at a temperature of 600°C or less in a non-oxidizing atmosphere or in vacuum for at least 1 minute for an appropriate time depending on the composition, and then cooled. manufacturing method. 6. The main component is an alloy consisting of 30-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% copper as a secondary component. Below, 20% or less each of tungsten and tantalum, 15% or less each of niobium, manganese, and chromium, 10% or less each of molybdenum, vanadium, gold, and cobalt, titanium, silicon, germanium,
5% or less of each of gallium, indium thallium, strontium, barium, platinum group elements, aluminum,
3% or less each of zirconium, hafnium, silver, rare earth elements, beryllium, tin, and antimony, and 2% or less each of boron and phosphorus, total of one or more of 0.0
After heating an alloy containing 1 to 30% in a non-oxidizing atmosphere or in a 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 lower than the melting point. Temperature to 100℃/sec~1
Cool to room temperature at an appropriate rate corresponding to the composition in °C/hour,
A wear-resistant high permeability alloy for magnetic recording/reproducing heads, which is further heated at a temperature of 600°C or less in a non-oxidizing atmosphere or in vacuum for at least 1 minute for an appropriate time depending on the composition, and then cooled. manufacturing method. 7. A magnetic recording/reproducing head using an alloy consisting of nickel in a weight ratio of 30 to 90%, one or both of zinc and cadmium in a total of 0.001 to 5%, a small amount of impurities, and the balance iron. & The main component is an alloy consisting of 80-90% nickel by weight, a total of 0.001-5% of one or both of zinc and cadmium, a small amount of impurities and the balance iron, and 30% or less copper as a secondary component. , 20% or less each of tungsten and tantalum, 15% or less each of niobium, manganese, and chromium, 10% or less each of molybdenum, vanadium, gold, and cobalt, titanium, silicon, germanium,
5% or less each of gallium, indium, thallium, strontium, barium, and platinum group elements; 3% or less each of aluminum, zirconium, hafnium, silver, rare earth elements, beryllium, tin, and antimony; and 2% or less each of boron and phosphorus. Total of 1 type or 2 or more types: 0.
A magnetic recording/reproducing head using an alloy containing 0.01 to 30%.