WO1980000891A1

WO1980000891A1 - Method of fabricating metallic magnetic tape

Info

Publication number: WO1980000891A1
Application number: PCT/JP1979/000261
Authority: WO
Inventors: J Kawai; H Garashi
Original assignee: Nippon Electric Co; J Kawai; H Garashi
Priority date: 1978-10-16
Filing date: 1979-10-15
Publication date: 1980-05-01
Also published as: DE2953244T1; DE2953244C1; JPS5555441A

Abstract

A method of fabricating a metallic magnetic tape, which method comprises the steps of cold rolling a laminated magnetic metal and non-magnetic metal while annealing the metals to stretch the metals into a thin form, and shaping the metals so that the final working rate in terms of the area reduction rate is higher than 95%. This method is suitable for mass production on an industrial scale.

Description

Method for manufacturing metal magnetic table

The present invention relates to a method for manufacturing a metal magnetic table, and more particularly to a method for manufacturing a metal magnetic table having a structure in which a magnetic metal layer is provided on a nonmagnetic metal base. Background art

Today, audio video equipment is undergoing remarkable development. It is an exaggeration to say that this is due to the fact that magnetic tables can be obtained reasonably, o It goes without saying that there was a constant effort to improve magnetic tables and reduce prices in this shade. However, the general situation is not satisfied with this situation.]) High quality, large recording capacity, and low price are required. O The most widely used magnetic table is The magnetic resin powder is coated on a polymer resin table as a space, but the magnetic properties of the magnetic powder have been improved.] Reduced thickness! ), And streamlined the various processes.]) On the other hand, the magnetic properties have been improved by devising to replace the oxide powder with a metal magnetic powder or by forming a metal magnetic layer by plating o

These attempts are based on the premise that a polymer resin table is used as a base. However, when a polymer resin table is used, (1) static electricity accumulates , (2) Elongation deformation

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No WIPO one (3) The temperature coefficient of expansion and contraction is large, and so on. For example, the causes of static electricity in (1) include an increase in noise and a problem such as loss of memory due to adsorption of dust, etc. o As a countermeasure, make it easier to discharge on the back of the base. Although surface treatments and the like are performed, a significant effect is obtained. ^ O Also, the elongation deformation of (2) is related to the reproducibility of the recording medium in the first place. In order to effectively suppress the extensional deformation to a negligible size, the thickness of the base must be at least a few meters. It can be said that there are some responsibilities in the use of tapes, such as the tape winding method)), but the tape itself still has a low tensile strength or a small plastic deformation initiation stress. There are really many points that need to be considered as problems of tables o (3) As with the above (2), consideration must also be given to the method of use for the expansion / contraction temperature coefficient, but this is also a problem of the table itself. In video, color unevenness problems may not be negligible.

The above problems (1), (2), and (3) are caused by the properties of the material constituting the base.] 3, Converting the base to a non-magnetic metal table O Therefore, a method of forming a magnetic metal layer by plating using a tape of non-magnetic metal as a base is described in Japanese Patent Application Laid-Open No. 52-109195. Suggested ₀

However, this method of producing a metal magnetic table by plating involves the following problems: (A) when the magnetic metal is an alloy, it is difficult to control the composition;

O PI WIPO The thickness of the metal layer is controlled with good precision, and it is difficult to plate continuously. (C) The metal structure formed by plating is fragile and temporarily annealed. Has the disadvantages that it softens before its brittleness is resolved, etc. 1—Not yet suitable for mass production on an industrial scale, but has not yet been put into practical use.

An object of the present invention is to solve the drawbacks of the plating method and to provide a method for producing a metal magnetic table having sufficient toughness and high productivity.

. Other objects of the &'invention, cold rolling method easily ¾ step by connexion metallic magnetic tape with -. Toku徵of is to provide a method for producing a blanking ₀ present invention, the magnetic metal Cold rolling is performed while performing intermediate annealing with the non-magnetic metal adjacent to each other, and the reduction rate by cold rolling performed after the final intermediate annealing is set to 95 or more in terms of the reduction in area of the magnetic metal layer. After that, final annealing is performed in a reducing atmosphere or in a reducing atmosphere])), and a metal magnetic table having a laminated structure in which the magnetic metal layer and the non-magnetic metal layer are lined with each other is manufactured. O In this case, the final annealing temperature should be lower than the recrystallization temperature of the magnetic metal and higher than 300 ° C. Those with a reduction ratio in the range of 95 to 99.5 have excellent properties.o

According to the present invention, there are advantages such as improvement of mechanical properties by cold rolling, for example, excellent toughness, high processing accuracy, excellent smoothness and flatness, and appropriate selection of annealing conditions. However, other than that, the saturation magnetic flux density is large. 周波数 The magnetic metal layer can be formed with extremely excellent continuity. The frequency characteristics are excellent. The tensile strength is more than one order of magnitude higher than that of the above, so the thickness can be reduced to less than about '3 β m (conventionally, 10 m or less is usual :) and the storage capacity is also 3 to 4 Easy to mass-produce metal magnetic tables with outstanding performance and twice the size o Easy explanation of drawings

Figures 1 to 5 show typical laughing embodiments of the present invention.

] 9 An example of the characteristics of the obtained metal magnetic table is shown in which the reduction ratio of the magnetic metal layer is shown as a parameter. O Fig. 1 shows data on coercive force, and Fig. 2 shows Fig. 3 shows data on residual magnetic flux density, Fig. 3 shows data on squareness ratio, Fig. 4 shows data on frequency characteristics, and Fig. 5 shows data on high output characteristics. Showing o

BEST MODE FOR CARRYING OUT THE INVENTION

Example 1.

2.50 ^ P-9.76 ^ Fe-8 7.74 ^ Co alloy was selected as the magnetic metal, and a plate-like material with a thickness of 3.1 rai and a width of 200 was prepared. A 5.0% S ri-0.6 ^ P-9 4.4%. C _U alloy was selected as the nonmagnetic metal, and a plate with a thickness of 30.3 dragons and a width of 200 mm was prepared. _{O The} two plates were stacked and the periphery was welded with a continuous welding machine.

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L tube ^Q The average grain size was 2.5 Am and the maximum grain size was 7. '5 im. O The joined metal plate was 0.1 »on the magnetic metal side and 0 on the non-magnetic metal side. (3) After the grinding, the process of cold rolling the intermediate annealing in hydrogen for 850 minutes was repeated several times, and the area reduction was reduced by 90% by cold rolling after the final intermediate annealing. , 95%, 98%, 99%, 99.5, 5 kinds of tapes were made. O Next, these 5 kinds of tapes were cut into 5 baskets wide. The test strips were lit and 5,000 m long for each were made. O These test tapes were placed in hydrogen at 300 ° G, 400 °, 550 °, 600 °, 60 ° C. 0 Ό, annealed for 30 minutes at 700 ° 0 o

For each of these test tables, the coercive force, residual magnetic flux density, squareness ratio, frequency characteristics, and maximum output level were measured. 0 In this case, the thickness of the magnetic metal layer was 0 in each case. 3 zm soil 5 and that of the non-magnetic metal layer was 2.5 to 3.0 βτη. The five figures in Fig. 1 to Fig. 5 show the results of these measurements.

Figure 1 shows the dependence of the coercive force on the annealing temperature, with the cold working rate as a parameter. Figure 2 shows the dependence of the residual magnetic flux density on the annealing temperature, which is converted only to the magnetic metal layer. The temperature dependence is shown in Fig. 3. ₀ As is clear from these data, a sufficient effect is exhibited when the cold working ratio is 95 or more. The recrystallization temperature (~ 550) of the magnetic metal is a rough guide.] 9, The magnetic layer according to the present embodiment, annealed in the temperature range of about 300-550 ° C, has an extremely excellent magnetic property. O For the table of the present invention, the frequency characteristic is also

Ο ΡΙ This is an important characteristic. Therefore, the conventional structure of r-Fe203 with a thickness of 5 Am and a content of 30 was coated with r-Fe203 powder on a polyester table. Figure 4 shows the dependence of the frequency characteristics on the annealing temperature for each tape of this example, with the output at 20 KHz measured for a commercial product as O dB.

Similarly, the large output characteristic is also one of the important characteristics.o Therefore, や) When the maximum output at 2 OKHz measured for the r-Fe 203 table commercial product is O dB. Figure 5 shows the annealing temperature dependence of the large output characteristics of each of the tables in this Example o The data shown in Figs. 4 and 5 also show the reduction in cold rolling. It is clear that the characteristics shown in this example are extremely excellent when the area ratio is 95 or more and annealing is performed at a low temperature not higher than the recrystallization temperature.

Subsequently, the head formed from the Mn-Zn lights obtained by hot breathing was attached to an ordinary video device, and the various tapes according to the present embodiment and the r-F The head was run for 1 000 hours with an e203 table to measure the amount of head wear. Table 1 shows the comparison of the results.o

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REACT OMPI As is evident from Table 1, the recrystallization temperature (about 55 to 0 in this example) is very small, regardless of the area loss rate of the steel annealed at low temperature. Annealing is possible even at annealing temperatures lower than. However, in this case, it takes a long time, so it is considered unsuitable for industrial use. Therefore, it is appropriate to set the annealing temperature to about 300 ° C. or less, which is about the recrystallization temperature or less.

^ The features of the embodiment of the present invention described above as a representative of Example 1 are as follows. First, both the magnetic metal and the non-magnetic metal are adjusted to a predetermined thickness ratio before the cold rolling of the present invention. And then cold rolling by direct lamination between these two metal plates without any intervening objects. Ο This is a minor contrivance compared to the two features described above.] Although it is possible to replace it with the other contrivances described later, both metal plates are stacked in order to prevent the two metal plates from shifting. Is fixed by welding prior to the cold rolling of the present invention.

2.44 ^ Ρ 一 7 8.05-6 Ni-19.51 ^ Fe alloy was selected as the magnetic metal, and a plate with a thickness of 3.0 thighs and a width of 200 thighs was prepared. We choose 17 Zn-18% Ni-65 $ Cu alloy and prepare a plate with a thickness of 29.9 83 WI and a width of 200 basket o and the above non-magnetic metal between these two metal plates A powder with the same composition as that of the average particle size of 75 ^ m laid without gaps After annealing in hydrogen at 850'0 for 15 minutes, it was hot-rolled into a 15 TO thick plate. In this case, both ends were fixed by tying both ends with a negative wire so that the two metal plates were offset. O Then, after rolling to a thickness of 0.6 dragon by cold rolling, final intermediate annealing was performed in hydrogen at 850 for 15 minutes. ₀ and finally rolled to a thickness of 3 by cold rolling.o The cold rolling reduction after the final intermediate annealing was about 99.5 even in the reduction area of the magnetic metal layer.

The metal magnetic tape of the present invention, in which the magnetic metal and the non-magnetic metal were combined in this manner, was cut to a width of 4 TO and then annealed in hydrogen at 500 for 10 minutes. The thickness of the magnetic metal layer of the table thus obtained was about 0.3 m.o The typical characteristic values were as follows.o

That is, the coercive force was about 100 000 e, the residual magnetic flux density of the magnetic metal layer was about 9620 Gauss, and the squareness ratio was about 89%. And are commercially available r - F e 2_Rei 3 Te - (comparison value at 2 0 KH _Z) the characteristic values of the probe frequency characteristics when the 0 dB is about 1 6.6 dB der, in 2 0 KH z Had a maximum output of 12.8 dB. In addition, the wear amount of the nitride head was measured in the same manner as in Example 1, and as a result, when the wear amount of the Fes Os table was 1, it was 0.025 in this example.

The above results are for the case where the final annealing temperature is 500 ° C. However, the results obtained by changing this in the temperature range below the recrystallization temperature (about 500) are almost the results obtained in Example 1. It has been proved that extremely good results can also be obtained by carrying out the present invention by a method such as that of this example. The feature of the embodiment of the present invention described above as a representative of Example 2 is that when both a magnetic metal plate and a non-magnetic metal plate shaped to a predetermined thickness are overlapped with each other, the two metal plates are sandwiched between the two metal plates. And uniformly subjecting the metal powder having the desired solid solubility to cold rolling of the present invention in that state. O Further, a device for preventing the two metal plates from being displaced. In this case, the two metal plates are fixed with a wire rod.

A 2.44 ^ P-48.78 ^ Co-48.7 8 ^ Fe alloy was selected as the magnetic metal, and a plate with a thickness of 3.2 orchids and a width of 200 thighs was prepared. 5 # m plated with copper o Also selected pure copper as non-magnetic metal, prepared powder with an average particle size of 75 m o And the above-mentioned magnetic metal plate The copper powder deposited on the plating surface was powder-rolled together with the magnetic metal plate. O When the powder rolling was completed, the thickness of the magnetic metal plate was 3.1 and the thickness of the copper compact was 31.6 dragons. was ₀ after sintering at 8 5 0 ° C 1 5 min in hydrogen at this state, correct the arcuate deformation caused by sintering shrinkage in breath machine, 0.1 thigh cutting magnetic metal surface on the side that is exposed O Rolled to a thickness of 0.6 mm by cold rolling, then final intermediate for 15 minutes at 850 ° C in hydrogen o Dulled o Finally, rolled to a thickness of 3 im by cold rolling o DOO-out thickness of the magnetic metal layer is All is about 0.5 m]), reduction of area of the magnetic metal layers by rolling were 9 9.2 or more o

The tape manufactured in this manner was processed in the same manner as in Example 2.

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A, WIPO It was lit, and the properties were evaluated by final annealing at about 57 O.'C. O One example of the properties is as follows.

In other words, the coercive force was about 11,000 e, the remanence: the flux density was about 22790 Gauss, and the squareness ratio was about 93. o A commercially available r-Fe 20 The frequency characteristic (comparison value at 20 KHz) is about 30.9 dB when the characteristic value of the 3 tables is 0 dB]), and the maximum output at 20 KHz is about 256 dB It was.

The amount of wear of the ferrite head measured in the same manner as in the above example was about 0.025 times the amount obtained by using r-Fe 203 table.

The above results are for the case where the final annealing temperature is 570, but the results obtained by changing this in the temperature range below the recrystallization temperature (about 600) are almost the same as those in Example 1. A)), it has been proved that very good results can also be obtained by carrying out the present invention in the manner as in the present embodiment.

A feature of the embodiment of the present invention described above as a representative of Example 3 is that, first, one of a magnetic metal and a non-magnetic metal is started in a plate shape and the other is started in a powder shape. In this case, prior to the cold rolling of the present invention, treatment such as powder rolling and sintering should be performed so as not to impede the cold rolling. Therefore, a metal having the same familiarity as the metal in the form of a layer or a plate is plated on the surface to be joined of the metal prepared in the form of a plate to a desired thickness, and the penetration between the two metals is determined. Improvements are also one of the features of the present embodiment. The “bow-shaped” deformation caused by the sintering process must be corrected by breathing before cold rolling. In addition, the exposed surface of the metal that has been prepared in a plate shape during powder rolling and sintering must be removed. Another feature of the present embodiment is a method of cutting thinly in order to remove the resulting altered layer. In Example 3, the non-magnetic metal was prepared as a powder, but it may be more convenient to use the magnetic metal as a powder.

'Implementation ^ 4.

2.5 O ^ P-9.7 6 ^ Fe-87.74 ¾6Co alloy was selected as the magnetic metal, and powder with an average particle size of 75 im was prepared.o Also, as the non-magnetic metal 1 7. Zn-18 Ni-6 5 ^ Cu alloy was selected and a 3 Ο πΛ thick, cross-sectional profile 2 60 mix x 7.1 composed of it was prepared. A 5 rai short tube was prepared. O And this short tube was filled with magnetic metal powder. The powder filling density was adjusted to about 3.5 by tapping.O The ends of the rectangular tube were filled with gauze and sealed to prevent the filled magnetic metal powder from spilling o

In this state, the tube was cold-rolled so that the cross-sectional area reduction rate (the omission rate specified by the present invention, o :) of the rectangular pipe was 10 to 9 from 10 steps in 10 steps. o Subsequently, the upper surface of the rolled material processed at various reduction rates was cut until the magnetic metal compact was exposed. In this case, if the area ratio is less than 30, the density of the green compact is so low that the green compact breaks down. Cracks have occurred due to poorness. O For this reason, there are 5 types

O PI The subsequent processing was advanced for those with a reduction in area o, that is, 4 hours at 850'G. After annealing in hydrogen, cold rolling with a reduction in area of about 15 and 1 in 8500 These samples were processed into 5 mm thick plywood by repeating “5 minute intermediate annealing”.

In addition, this joint plate is cold 0. 6 Rolled to thickness and cut off non-metallic parts at both ends o The subsequent steps were the same as in Example 2. ₀ First, final intermediate annealing was performed in hydrogen at 850 for 15 minutes, The final cold-rolling rate at this time was 30.9 m, and the cold-rolling rate at this time was about 0.99.5 even in the area reduction rate of the magnetic metal layer. Afterwards, final annealing at 50 O'C o

The characteristics of each of the thus obtained samples were evaluated in accordance with the above-mentioned Example. ₀ As a result, the characteristics in Example 1 were reduced to 99.5%, and the characteristics obtained when final annealing was performed at -500. ₀ Further it was found base of the same favorable properties, the final annealing temperature was varied were subjected to experimental study similar to the recrystallization temperature or more (about 5 5 0 °) or less 3 0 0 It has been confirmed that satisfactory results can be obtained in the region o

The feature of the embodiment of the present invention described above as a representative of Example 4 is that, first, one of the magnetic metal and the non-magnetic metal is started in a tubular shape and the other is started in a powdery state. In order to fill the pipe with powder, the powder rolling and sintering shown in Example 3 were used! ) Also readily advantages force ^s ¾ high density of the green compact can be formed> Ru.

It is easy to confine the ends of the tube filled with powder with gauze, and it is easy to do it. Of course, there are some means such as sealing; _

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/ — ^WIPO , It is. It is natural that a short tube is convenient as the tube shape, but it is not impossible with other shapes such as a round tube. O

In Example 4, the non-magnetic metal was made into a tubular shape. On the contrary, it is sometimes convenient to make the magnetic metal into a tubular shape. This has been specifically described using an example. However, these embodiments are only examples. Among the features of each embodiment, those that can be replaced with each other can be replaced with each other, and by developing the concept, other realities and embodiments not described here can be easily reached. Things.

For example, even if one of the magnetic metal and the non-magnetic metal is made into a tubular shape, the other need not be made into a powdery form. In some cases, it is convenient o It is of course also meaningful to improve the conformability by plating the inner surface of the pipe o In addition, the non-magnetic metal layer or the magnetic metal layer itself should be a multilayer. It is also within the scope of the present invention to improve its mechanical and electromagnetic characteristics.

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Claims

The scope of the claims

1. Cold rolling is performed by performing intermediate annealing with the magnetic metal and non-magnetic metal being adjacent to each other, and the working ratio by cold E-rolling applied after the final intermediate annealing is determined by the reduction in area of the magnetic metal layer. 95 or more, and then subjected to final annealing in a neutral or reducing atmosphere, so that the magnetic metal layer and the non-magnetic metal layer are lined with each other. O How to make

2. The method for producing a metal magnetic tape according to claim 1, wherein the final annealing is performed at a temperature not higher than the recrystallization temperature of the magnetic metal and not lower than 30.0.

3. The reduction rate of the metal magnet and the tape according to claim 1 or 2, wherein the area reduction rate of the magnetic metal layer is not less than 95 and not more than 99 95. Production method.

4. The method according to claim 1, wherein the magnetic metal is a Fe-Co-P alloy.

5. The method of claim 1, wherein the magnetic metal is a _Fe-Ni- P alloy.

6. The method for producing a metal magnetic table according to claim 1, wherein a nonmagnetic metal powder is introduced between the magnetic metal layer and the nonmagnetic metal layer.

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