JPS58123848A - Wear resistant high permeability alloy for magnetic recording and reproducing head, its manufacture and magnetic recording and reproducing head - Google Patents

Abstract

PURPOSE:To increase the saturation magnetic flux density of an Ni-Fe-Nb alloy without deteriorating the wear resistance and the effective permeability in a high frequency magnetic field by reducing the Nb content of the alloy and by adding a small amount of O. CONSTITUTION:This wear resistant high permeability alloy for a magnetic recording and reproducing head with >=5,000G saturation magnetic flux density consists of, by weight, 5-65% Fe, 0.5-10% Nb, 0.0003-0.1% O, a small amount of impurities and the balance Ni or further contains 0.01-30% in total of one or more among <=30% Cu, <=15% each of W, Ta and Mn, <=10% each of Mo and Co, <=5% each of Cr, V, Ti, Ge, Ga, In and T, <=3% each of Al, Si, Zr, Hf, a rare earth element and a Pt group element, and <=2% each of Be, Sn, Sb, B and P as secondary components. The alloy is heated at about 600 deg.C- the m.p. in a nonoxidizing atmosphere or in vacuum for a suitable time of >= 1min according to the composition, and it is cooled from a temp. above the order- disorder lattice transformation point to ordinary temp. at a suitable cooling rate of about 100 deg.C/sec-1 deg.C/hr according to the composition.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention has excellent magnetic properties and wear resistance in an alternating magnetic field, is easy to forge, and is suitable for magnetic recording/reproducing heads.
I & permeability alloys and their manufacturing methods as well as magnetic writing heads.

Since magnetic recording and reproducing heads such as tape recorders operate in an alternating magnetic field, the magnetic alloy used in this case must have a high effective value magnetic coefficient in the imJ & wave magnetic field, and the magnetic tape must be in contact with the This is probably due to the fact that the carp and mackerel have good abrasion resistance because they are cut into pieces. Currently, Ichisendust (Fe-8i-All gold alloy) and ferrite (MnO-ZnO-Fe, O3) are available as magnetic alloys for magnetic heads with excellent I11 wear resistance, but these are extremely hard and brittle, so forging , rolling is impossible, and grinding and polishing methods are used to manufacture the head core.
Therefore, the product has a value of t. In addition, since Sendust cannot be made into a thin plate (the saturation magnetic flux density is large), the effective value -Φ in a one-round temporary magnetic field is relatively small. Also, the effective value of ferrite is M! The rate is large or the saturation magnetic flux density is 5000G
The disadvantage is that it is small. On the other hand, permalloy (Ni
-Fe thread metal alloys are easy to forge, roll and punch and have excellent IT productivity, but their major drawbacks are that they are soft and easily abraded.

Akihisa Honko et al. conducted research on the wear resistance of Ni-F6 thread alloys, and previously published N
Invented i-Fe-Nb alloy. This Ni-Fe
- Nb-based alloys are easily forged and have excellent IIFI abrasion resistance, making them suitable for magnetic recording/reproducing heads. Later, magnetic tapes with a coercive force of 1 were adopted in magnetic recording/reproducing machines to increase the recording density. As a result, magnetic alloys for magnetic heads are required to have a high saturation magnetic flux density. For this reason, even in Ni-Fe-Nb alloys, there has been a trend to reduce the content of Nbl1, which is a non-magnetic additive, in order to increase the saturation magnetic flux density. However, if the Nb1l;
l) t@f This is not considered an appropriate method as it will degrade the effective transmission t & i in the W world. However, there are currently some improvement measures in place! If'tei is.

The present invention aims to maintain superior wear resistance and effective permeability without reducing the saturation magnetic flux density of the Ni-Fe-Nb alloy as much as possible.
When a small amount of oxygen is added to the i-ye-Nb alloy, niobium oxide is produced, and the synergistic effect of niobium and oxygen achieves this objective.

In other words, in general, non-metallic inclusions such as oxides are considered to deteriorate the magnetic properties of alloys with high magnetic flux, and efforts are made to remove them as much as possible.
This method aims to improve the wear resistance and the real S and S magnetic properties of the Ni-Fe-Nb alloy by actively producing thread removal products.

The present invention has a wit ratio of &) 5 to 66%, and a niobium of 10.5 to 66%.
lO%, oxygen o, oooa~o, i% (especially 0.001
~0.1%), with a small amount of impurities and the balance nickel, or with this as the main component, and side components of 6ao% or less, 16% each of tungsten, tantalum, and manganese.
Hereinafter, %') F, :1 each of Baltic 1
0% or less, 5% or less of each of chromium, vanadium, titanium, germanium, gallium, indium, and thallium, aluminum, silica, zirconium, and hafnium.

A total of 0.01-80% of 1 or more of 8% each of platinum group elements, 8% or less of each of beryllium, tin, antimony, phosphorus, and phosphorus, with a small amount of impurities. The remainder is made of iron, has a saturation magnetic flux density of 500 Q G or more, has excellent wear resistance and effective magnetic permeability, and can be used for magnetic recording/reproducing heads. l permeability pertains to magnetic alloys.

Furthermore, the present invention relates to a magnetic recording/reproducing head with excellent wear resistance manufactured using the above-mentioned 11i & magnetic permeability alloy for the case and core.

To make the alloy of the present invention, first the main component iron is 6 to 65%,
After melting 0.5 to 10% of niobium and the balance of nickel in a non-oxidizing atmosphere or in a suitable decomposition furnace, it is subjected to excessive hM, #, desulfurization. Add a small amount of agent to remove as much impurity as possible, and then add tungsten, tungsten, or
15% or less each of tantalum and manganese, 10% or less each of molybdenum and cobalt, 6% or less each of chromium, vanadium, titanium, germanium, gallium, indium, and thallium, aluminum, silicon, zirconium, hafnium, rare earth elements, and platinum group metals. Add 8% or less of each of the elements, 2% or less of each of antimony, boron, and phosphorus, or a total of 0.01 to 80% of two or more, and stir thoroughly, Create a compositionally uniform molten alloy. Next, an appropriate amount of oxygen is added to the molten alloy by injecting oxygen gas or an appropriate gas containing oxygen into the furnace to adjust the pressure, or by adding an appropriate amount of an oxide of an alloying component.

Next, this is poured into a mold of an appropriate shape and size to obtain a healthy lump, which is then subjected to forming processes such as forging hot dark rolling and cold open rolling at high temperatures to form the desired shape, e.g. Use a thin plate with a thickness of 0.1.

Next, punch out a piece of the desired shape and size from the thin plate, and heat it in a suitable non-foaming atmosphere or in a vacuum at a temperature above the recrystallization temperature, that is, about 600"C or above, and a melting point above 800"C. Heat to the following temperature for 1 minute or more, then cool at an appropriate rate depending on the composition, e.g. 100'C/sec to 1'C/hour.
The saturation magnetic flux density is 5000 by heating to a temperature of 0°C or lower (regular lattice-irregular lattice transformation point or lower), especially 200 to 600°C for 1 minute or more and 100 hours or less, and cooling.
It is possible to obtain a permeability magnetic alloy having a magnetic permeability of more than G and 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 cooling is rapid or gradual, but the cooling rate below this transformation point has a significant effect on the magnetism. In other words, by cooling from a temperature above this transformation point to N temperature at an appropriate rate corresponding to the composition of 100°C/1°C/hour, the regularity of the earth is increased to 1°C, and excellent magnetism is achieved. can get. If the material is rapidly cooled at a rate close to 100 DEG C./second among the above cooling rates, the degree of order decreases, and if the cooling continues any longer than this, the degree of order does not follow, and the degree of order decreases further and the magnetism deteriorates. However, if the less ordered alloy is reheated and cooled to goθ℃~600℃ below its transformation point,
Regularization progresses to a moderate degree of regularity of 0.1 to 0.6, improving magnetism. On the other hand, the above strange! If the material is slowly cooled from a temperature above the storage point at a rate of, for example, 1° C./hour or less, the ordering will be too advanced and the magnetism will be low.

Next, embodiments of the present invention will be described.

Jyoga Example 1 Alloy No. 18 (Composition Ni-81.0%, Nb-5.0%
,0. -0.022伽、Remaining @Fe) To make a sample, put the total weight of 800 g of the alloy material with the above composition into an alumina crucible, melt it in a high-frequency induction furnace in vacuum, and stir well to make a homogeneous material. j81 & alloy. Oxygen gas was then injected into the furnace, and 6
After adjusting the pressure to rr and holding it for 5 minutes, set it to 1g5ms0.
, and 170111+ holes were injected into the age wrinkles, and the obtained # block was forged at about 1000° C. into a plate with a thickness of f'J 7 m. Furthermore, the thickness lag between approximately 600 and 900℃
Hot pressed to 0.1, then cold rolled at room temperature
11111 thin plate, outer diameter 45mm, inner pole 8δ
(2) The annular plate and the core of the magnetic head were punched out. Then, these were subjected to the divine heat treatment shown in Table 1, and the annular plate was used to check the magnetic properties and hardness, and the core was used to manufacture a magnetic head, and a surface roughness meter was used to test the magnetic tape (Orb, ) for z00 hours. The amount of wear afterwards was measured and the grains shown in Table 11 were obtained.

Example 8 Alloy number 87 (composition Ni-80.5%, Nk)-7.0
%, No-1,5%.

0, -0.016%, balance ye) To make a sample, put 800 g of all the heavy rice of the alloy material with the above composition into an alumina crucible, melt it in a high-frequency induced Al111I air furnace in vacuum, and stir well to form the molten alloy. And so. Then, atmospheric air was injected into the furnace, and the pressure was adjusted to 1 x 10-'' TOrr and held for 6 minutes.The subsequent manufacturing process was as in Example 1.
is the same as The samples were subjected to various heat treatments and the properties shown in Table 2 were obtained.

243- Next, Table 8 shows that after heating in a vacuum at 1160 °C for 2 hours, cooling from 600 °C at an increasing rate to room temperature,
Alternatively, this was further reheated at a temperature of 600° C. or higher, and the properties of a typical 7j alloy measured at room temperature are shown below.

Next, the effect of oxygen addition to the alloy of the present invention will be described in detail with reference to the drawings. Figure 1 shows 8.1%Ni-Te1-6%
The relationship between oxygen content, saturation magnetic flux density, effective magnetic constant, hardness, and wear amount is shown for Nb-0 alloy. In general, as the number of wrinkles increases, the hardness increases significantly, and at the same time, the hardness increases
Wrinkles are significantly reduced, and the effect is particularly great when a small amount of oxygen is added.

Furthermore, in general, the addition of oxygen has a great effect of increasing the effective magnetic permeability in an alternating current magnetic field (particularly a high frequency magnetic field) that operates a magnetic recording/reproducing head. However, it can be seen that if the @ element content exceeds 0.1%, forging and processing become difficult, and the magnetic properties become unsuitable as a magnetic alloy for a magnetic head.

The high hardness and wear resistance of the alloy of the present invention is due to the effect of niobium, which is why the Ni-Fe alloy has a b! il
It is believed that when oxygen is added to this, strong niobium thread oxides, other nickel threads, and iron-based oxides are finely precipitated on the ground, causing further hardening. In addition, the fine precipitation of these oxides divides the magnetic domain and increases aIll, which relatively decreases the movement speed of the domain wall in the alternating fM magnetic field, which reduces the current loss and the human population. It is thought that a good effective magnetic flux rate can be obtained.

Furthermore, Ou, W, which are added as #Ill components,
'ra.

Mn, Mo, Co, Or, V, T
i, Go, Ga # In.

Tt, Mul, Si, Zr, Hf, rare earth elements, platinum group elements, Be, Sn, Sb,
B and P are effective in increasing the electrical resistance of the base plate of the present invention, co is effective in increasing the saturation magnetic flux density, and Qu is effective in increasing the saturation magnetic flux density.

w, Ta, v, xi, Ge, Ga
, Eng., TI, Mul.

Si, Zr, Hf, rare earth elements, platinum group elements, Be.

sn, Sk+ + B and pHjp are the wear resistance of the alloy of the present invention &! The effect of #I is great. In addition, these subcomponents also generate oxides, which improve the effective transmission of Mi and N separation properties as described above. In short, the alloy of the present invention has a saturation magnetic flux sonicity of 50,000y or more, so it is not only suitable as a magnetic alloy for magnetic heads, but also has a large effective permeability, high hardness, excellent wear resistance, and good workability. It is also very suitable as a magnetic material for use in magnetic recording heads of VTRs and electronic machines, as well as ordinary 11-degree equipment.

Next, in the present invention, the composition of the alloy is limited to 5 to 65% iron, 0.5 to 10% niobium, oxygen o, oooa ~ 0.1%, and the balance nickel, and the elemental copper 80 added to this is
% or less, 16% or less each of tungsten, tantalum, and manganese, 7% or less each of sorybdenum, cobalt, lime, and vanadium.

Titanium, germanium, gallium, indium.

Less than 5% each of thallium, aluminum, silicon,
Zirconium, hafnium, rare earth light m.

Less than 8% of each of the platinum group elements, beryllium, and plow.

The reason for limiting antimony, phosphorus, and phosphorus to a total of 0.01 to 80% of each of 2% or less, or 21, is based on the scope of the work, as is clear from the examples, Table 8, and drawings. The saturation magnetic flux density of H is 6000G or more, which has low effective magnetic permeability and hardness, excellent wear resistance, and good workability. However, if the composition is outside this range, the saturation magnetic flux density becomes 5000G or less, Effective X! l! This is because the grain size and hardness decrease, wear increases, and machining becomes difficult, making it unsuitable as a material for magnetic recording raw heads.

That is, niobium is 0.6% or less and oxygen is o, oo
If the content of niobium is less than os%, the effect of the addition will be small; if the content of niobium exceeds 10%, the saturation magnetic flux density will be 5000 G or more, and if it exceeds 0.1%, the #I71 manufacturing process will become difficult.

In addition, the subcomponents are less than 180%, 15% tungsten, 15% manganese, 10% molybdenum, and chromium B.
%, vanadium IS%, titanium 5%, germanium 5%
, 5% gallium, 6% iridium, 5% thallium, 8% aluminum, 8% lithium, 8% hafnium, 8% rare earth elements, and 8% platinum group elements. This is because it becomes difficult to forge or process if beryllium exceeds 2%, -2%, antimony 8%, boron 2%, and phosphorus 2%. This is because the effective magnetic permeability decreases when .

□ Furthermore, as is clear from Table 8, Ni-Fe-Nb
Adding any of #llll1 to the -0 thread alloy increases the effective magnetic permeability, increases the hardness, and improves the wear resistance, so the addition of these subcomponents has the same effect. , can be regarded as having the same effect. In addition, the rare earth elements are composed of scandium, yttrium, and lanthanum thread elements, but the effects of adding the subcomponents are exactly the same,
The platinum group element is platinum.

Iridium, Ruthenium, Rhodium, Radium.

It consists of osmium, but its effects are exactly the same.Although carbon, carbon dioxide and sulfur generally impair workability, they increase hardness and improve wear resistance, so they are effective up to 0.1% each. However, even if it is included as an impurity in the alloy of the present invention, it will not support running.

[Brief explanation of the drawing]

Figure 1 shows 81%N1-Fe-6%Nk)-0 alloy17)
FIG. 2 is a characteristic diagram showing the relationship between wrinkles, effective magnetic permeability, saturation magnetic flux density, hardness, and wear type.

Claims (1)

[Claims] L Iris ratio: 1 liter (6 to 66%, 10.5 to 10
%, 0.0008 to 0.1%, a small amount of impurities, and the remainder nickel, and is characterized by having a saturation magnetic flux density of 5000 G or more. l Iron: 6-65%, Nitrogen: 10.5-10%,
The main component is an alloy consisting of acidic o, oooa ~ 0.1%, a small amount of ingredients, and the balance is nickel, and the subcomponent is w480.
% or less, 15% or less each of tungsten, tantalum, and manganese, 10% or less each of molybdenum and cobalt, chromium, vanadium, titanium, and germanium. 5% or less each of gallium, indium, and thallium; 8% or less each of aluminum, silicon, zirconium, /17Eum, rare earth elements, and platinum group elements; 2% each of beryllium, copper, antimony, boron, and phosphorus. The following 14ilil or 8 or more types total 0.01-80
%, and has a saturation magnetic flux density of 5000 G or more.
16 permeate alloy. 1 Iron 5-66%, niobium 0. r1~10%
, oxygen o, oooa ~ 0.1%, a small amount of impurities, and the balance nickel alloy in a non-oxidizing atmosphere or vacuum at a temperature of 600°C or higher and lower than the melting point for at least 1 minute or more for an appropriate period of time corresponding to the composition. A wear-resistant wear-resistant magnetic recording/reproducing head for a magnetic recording/reproducing head, characterized in that after heating, cooling is performed from a humidity above the regular-irregular lattice attenuation point to room temperature at an excessive rate corresponding to the composition of the 100°C/lEp to 1°C layer. Method for producing magnetic permeability alloy. Iron 5-65%, niobium 0.5-10%,
The main component is an alloy consisting of oxygen o, oooa ~ 0.1%, a small amount of impurities, and the balance is nickel, and the secondary component is 80% copper.
Below, 1 each of tungsten, lintal, and manganese
6% or less, molybdenum, Fval F each 10% or less, chromium, vanadium, titanium, germanium. 5% or less of each of gallium, indium, and thallium,
8% or less of each of aluminum, silicon, zirconium, hafnium, rare earth elements, platinum group elements, 11+ or 2 or more of 8% or less of each of peri-i) ram, tin, antimony, boron, phosphorus, or a total of 0.01 to 80 % in a non-oxidizing atmosphere or in the air at a temperature of 600°C or higher and lower than the melting point for at least 1 minute.
It is characterized by heating for an appropriate period of time corresponding to the composition, and then cooling from a temperature above the regular-irregular lattice transformation point to room temperature at an appropriate rate corresponding to the composition of 100°C/sec to 1°C/hour. A method for producing a wear-resistant, highly transparent, 1i1f ratio alloy for magnetic recording/reproducing heads. & Weight ratio of iron b ~ 65%, niobium 10.5 ~ 10%,
Oxygen o, o o o a~0.1%, a small amount of impurities, and a residual S=Tsukeru alloy is heated in a non-oxidizing atmosphere or in vacuum at a temperature of 600'C or higher and below the melting point for at least 1 minute or more and 100 hours or less. After heating for an appropriate time corresponding to the composition of
00°C/sec to 1°C/hour to room temperature at an appropriate rate corresponding to the composition, and further cooled at a temperature below the regular-disorder transformation point in a non-oxidizing atmosphere or in vacuum for 1 minute or more. A method for producing a wear-resistant and magnetically permeable alloy for magnetic recording/reproducing heads, which comprises heating and cooling for an appropriate time depending on the composition. a weight ratio of 5 to 61s% to fl, 10.5 to 1% of niobium
The main component is an alloy consisting of 0% oxygen, oooa ~ 0.1%, a small amount of impurities, and the balance nickel, and the secondary component is 180% or less, tungsten. 15% or less each of tantalum and manganese, 10% or less each of molybdenum, cobalt, chromium, vanadium, titanium, germanium, 5% or less each of gallium, indium, and thallium, aluminum,
8% or less of each of silicon, zirconium, hafnium, rare earth elements, and platinum group elements, beryllium, #1. Antimony, boron, phosphorus each with 1 or 2% less than 2%
6 alloys containing a total of 0.01 to 80% of
After heating for an appropriate time corresponding to the composition for at least 1 minute to 100 hours in a non-oxidizing atmosphere or vacuum at a humidity of -OO°C or higher and lower than the melting point, it is heated to a temperature higher than the regular-irregular lattice transformation point to Cool to room temperature at an appropriate rate corresponding to the composition of °C/45-1 °C/hour, and then cool for at least 1 minute in a non-oxidizing atmosphere or in vacuum at a humidity above the regular-irregular lattice transformation point. Shuki, which is characterized by heating and cooling at the same time according to the composition.
High wear resistance for recording/reproducing heads! wM manufacturing method of i-magnetic alloy. v, 5-65% iron, 0.5-10 niobium in 4-weight ratio
%, oxygen o, oooδ~0.1%, a small amount of impurities, and a magnetic writing head using an alloy consisting of Western nickel. a 5-66% iron by weight, 0.0% niobium. l5NlO%
, oxygen o, oooa ~ 0.1%, a small amount of impurities and the balance nickel as the main component, @80 as a subcomponent
% or less, 15% or less each of tungsten, tantalum, and manganese, 10% or less each of solipdenum, cobalt, chromium, vanadium, titanium, and germanium. 5% or less of each of gallium, isidium, and thallium,
8% or less each of aluminum, silicon, zirconium, hafnium, rare earth elements, and platinum group elements; 2% or less each of beryllium, plow, antimony, boron, and phosphorus; a total of 0.01 to 80% of 1- or 2 or more others; A magnetic recording/reproducing head using a firefly containing the same.