JPS6043802A - Composite and its manufacture - Google Patents

Abstract

PURPOSE:To obtain magnetic core material for a magnetic head superior in reproduction characteristics for high density recording and suitable for mass productivity by using a composite composed of a part at which metal magnetic materials are directly contacted with oxide magnetic materials and a part at which both the magnetic materials are joined with each other via glass. CONSTITUTION:The titled device is composed of a part at which metal magnetic materials 1 are directly contacted with oxide magnetic materials 2 and a part at which both the magnetic materials 1 and 2 are joined with each other via glass 7. For example, an abraded Sendust block 1 and ferrite block 2 are fabricated, a groove 3 is formed in parallel with the ferrite block 2, and a glass rod 4 made of sodalime glass is inserted into the groove 3. After the Sendust block 1 is superposed on the glass rod, it is set in a U-shaped jig 5 made of ceramics and fixed by a wedge 6 made of ceramics. The jig is inserted into a furnace and heated to 700 deg.C in a nitride atmosphere to fuse the glass rod and use it as glass 7. Thus, a composite 8 of Sendust and Mn-Zn ferrite is obtained.

Description

[Detailed description of the invention] ゛The present invention is directed to a metal magnetic material and an oxidized magnetic r opening A'4'z1.
and (7) relating to the composite and its manufacturing method,
This article relates to magnetic core material 1131, which is blindly excellent for use in magnetic heads.

Magnetic materials can be roughly divided into metal magnetic materials (1) and n-metal magnetic materials (so-called ferrites).In general, 0i1 materials have a high saturation magnetic flux density Bs, but have a low resistivity C, and therefore are suitable for high frequencies. The loss in the area is large. On the other hand, ferrite has a high resistivity, so the loss in the high frequency range (・) is small, but on the other hand,
It has properties such as low saturation magnetic flux density 3s. For the above reasons, in the high frequency range (generally, low barrel loss Ferrite 1~ is often used as the magnetic t\rad magnetic core material used, but in the near 'L1-(4k'Q) With the demand for higher densities of magnetic recording media, the magnetic coercive quadrature ICs of magnetic recording media such as tapes have become larger, making it necessary to make the magnetic field formed by the magnetic gap sharper and stronger. In order to form such a magnetic field,
The saturation magnetic flux density BS of ferrite was insufficient. To compensate for these drawbacks of ferrite 1, a composite 1 material that combines low-loss ferrite and high saturation metal magnets (I materials) is considered. 15216, Koma1ii1 i!ii b7-189
323, JP-A-57-191821, a method of inserting a thin plate or thin ribbon of a metal magnetic material into a thin groove formed in a metal magnetic material, and a method of inserting a thin plate or ribbon of a metal magnetic material into a thin groove formed of a metal magnetic material, A composite is formed by sandwiching both sides of this with temporary layers, and the gold 5G of this composite is
A pair of 1'' so that the thin plates of A'31 are facing each other.
Jli 4; Match f and ht! There are several methods for forming the air head. However, in the former method, 1, glass or the like is interposed between both RII interfaces to fix the thin plate of the metal heat fJ Δ material and the groove side of the ferrite, so there is no contact or non-contact between the two parts (A111). This causes problems such as a gap I41 being formed between the inner magnetic materials, leakage magnetic flux is generated in the i′i earth circuit, and the recording and reproducing characteristics of the magnetic head are deteriorated. However, there are drawbacks such as the process being complicated and complicated, and lack of mass production.

In addition, in the latter case, not only does the manufacturing process of the magnetic head require IC IC, but it is also necessary to manufacture each magnetic head individually.
8 The present invention has drawbacks such as lack of mass productivity.8 The present invention is superior to the conventional metal magnetic material described in 6jj. The purpose of the present invention is to provide a magnetic core material for a magnetic head that eliminates the drawbacks of composites with magnetic materials, has excellent recording and reproducing characteristics, and is suitable for mass production, and a method for manufacturing the same. That is. In particular, it eliminates the complexity of the magnetic head manufacturing process caused by the use of conventional composite 1-holes, and handles single metal magnetic materials or flunoids! ! There is a magnetic core that can easily produce a high-performance magnetic head using the same process as the manufacturing process, and a method for manufacturing the same.

In order to achieve the above object, the composite of the present invention (J) has a part where the metal magnetic material and the oxide magnetic material directly touch, and a part where the internal magnetic material (A) is connected to the rice grains through glass. In addition, the metal magnetic material 1, the oxide magnetic material, and the glass bonding the two magnetic materials have a difference between their respective coefficients of thermal expansion. is 1
It consists of a combination of materials within 0%, and the drawing of the composite is a tr structure in which glass is embedded in a groove or depression formed in one or both of the metal magnetic material or oxide magnetic material. It becomes.

Composite metal magnetic materials used as magnetic core materials for magnetic heads include t2c-AA-8i alloy (Sendust) or Fe-Ni alloy (Permalloy), and oxide magnetic materials. , Mll-Z I+fephite or N1-z11 ferrite is used, and the magnetic core abrasion complex for magnetic heads that particularly requires thickness resistance 11 is Fe-A℃-81 series metal containing and IVIII. - It is preferable to use a combination of Zll flight I lights, and this
The composition of n -z n ferrite is Fe 20
3. : 52-65 mol%, MnO: 28-48 mol%
, ZnO: Use a material in the range of 0 to 7 mol%.
Ru.

Further, the method for producing 79 coalescence of the present invention includes a) a step of smoothing the respective lubricating surfaces of the metal 1d abrasive material and the oxide magnetic material, and b) gold B! T culm, etc., where grooves or depressions are formed in order to reduce the i-magnetic monthly charge and the oxidation magnetism November charge, etc.C) Groove or 1c is the process of installing glass in the depression.

d) stacking and heating the internally magnetic materials, and) making the internally magnetic materials whole and joining the internally magnetic vJ rice grains together. ((Place glass on or near the leak or depression, melt the glass, and apply it to the groove or depression), and roughly remove the cuffs that have adhered to areas other than the groove or depression.) It is possible to smooth the bonding surface by forming an empty vortex or depression in contact with or near the groove or depression in which the glass is buried, so that one of the metal magnetic material and the oxide magnetic material '11 When joining with glass,
It is also possible to take measures to prevent the glass from penetrating into the parts of the inner magnet 11 that are in direct contact with each other.

To explain in detail, one or many grooves or a large number of grooves are formed on at least one side of the temporary bonding surface of a smooth metal magnetic material plate or oxide magnetic vUfi. The hollow is filled with glass, and the surface of the part where the hollow is not formed is in direct contact with the other magnetic member, and both members are firmly joined by the glass in the groove or hollow. It is. Used in the present invention. Metallic abrasive materials include Fe-AJ2-8i alloy (so-called centast) and Fe-Ni alloy (so-called permalloy), and oxide magnetic materials include M
II -ZIT-based ferrite 1-Also, ferrite such as Ni-Zn ferrite can be used.

3>l1jRkei'fi (I Ji21 and oxide magnetism 4
Regarding the combination of J n -C is 11IIIl Negative 2'
” is joined with J lath, so at least b both' +:IJ
i'l 4jJ); 'l's coefficient of thermal expansion is approximated by J, ¥N IIs6. It is also interesting to note that the thermal expansion of the bonding glass is similar to that of the internally magnetic glass 1.

The reason for this is that there is a large difference due to the thermal expansion of the king. Agetai Karasu melt), ti! In the cooling process after bonding, strain stress occurs due to the difference in contraction rate caused by the difference in the thermal expansion relationship between the three materials, which may cause cracks in the oxide magnetic material or glass. )＼Even if it does not occur, a significant decrease in magnetic properties due to strain stress may occur,
Furthermore, when manufacturing a magnetic head, cracks occur during the manufacturing process, so the difference in the thermal expansion coefficient of the king is within 10%, and more preferably 5%.
It is better to be within Furthermore, the coefficient of thermal expansion of No.
The strongest bond is obtained when the intermediate value of the material is 0+fi, and the decrease in 14&ki'Bi ('1) can be reduced.

Silk material with metallic magnetic material and oxide magnetic phase)
For example, in the case where the magnetic head 1 moves at a relatively high speed; (so-called lengthst) is 1 fin (13 s), this centast is generally 140 ~ 1 (i 0 × 10
C has a high coefficient of thermal expansion of -'/°C.
It is preferable to use IVIn-Znn ferrite, which has a high coefficient of thermal expansion. Roughly, the thermal expansion coefficient of Mn-7n-based fluorite differs depending on its composition (Mn that has a thermal expansion coefficient that is within 10% of the thermal expansion coefficient for length 1).
The composition of -7-n-based Ferrai 1- is Fe 2037JX
52 to 65 mol%, MnQ 28 to 48 mol%, /1
) It is necessary to select from ○ or 0 to 7 mol%.

Also, regarding the glass used for manufacturing the composite of the 4N invention,
1J, its thermal expansion coefficient must be similar to that of the internal magnetic material, and when using this composite as the magnetic core material of a heating head, it is necessary to Since there is a case where a pair of joints are joined together using a pair of cufflinks, the internal magnetic vJ:
131 No. 1] In order to prevent misalignment, the softening humidity of the glass used when manufacturing the composite is harder than the ψ and ζ temperatures of the cuffs used in the manufacturing process of magnetic heads. It is preferable.

In addition, in step C) of the method for manufacturing a single composite tube of the present invention, a lifting platform with enough space to insert glass into the recess can be simply installed with a glass rod or piece of glass. Good, but if the groove or depression is small, use '+ilj
Or 1 Umino' 2 Ori) MaQ! Install the glass in the car, melt it, embed the glass in the groove or depression, then remove the glass that has adhered to the area other than the groove or depression, and bring the river to a normal temperature? i
It is preferable to use a polishing or grinding method. The advantage of this method is that the cuffs are buried and
It is possible to make it extremely thin, and therefore -C)))
By widening the area where 'J' and 'tA N'41 come in direct contact with each other, reducing the corner air loss by 11 (J), and by adding a number of crows in the narrow width. C'5'H Ruri,! increases the bonding strength.

ma) ko] Niku jd) l ko J3, then put on the cuffs Rgj
! L J This 1 singing crow sometimes makes 6S on the part where the inner magnetic abrasive material comes into direct contact ψ-C, especially the inner magnetic abrasive 47
Damn 1 or 1 N'? If it is necessary to place a piece of glass in a groove or depression adjacent to or near the groove or depression, place the diffused glass in it. It is preferable to store the materials in a groove or depression, and after putting the two materials together, place them upright in a jig shaped like a square, and place them in a wedge or the like.
It is also better to firmly fix the bonding surface of the inner magnetic strip, or to mechanically fix the bonding surface of the magnetic tape. In addition, in the process of melting the glass in advance and burying it in the leak or depression in (J"i and C), when the glass is melted, the characteristics of the magnetic material may deteriorate due to the atmosphere in the kiln. It is preferable to keep the atmosphere neutral or oxidizing.

In Hirani-I (〒1), the latent formed in the magnetic material is formed in the inner magnetic material, such as when it is formed in the = force of either the gold 1712 B'P material or the oxide magnetic material. However, depending on the application, this method may be preferable depending on the application, so metallic magnetic materials are still more suitable. Whether a groove or one groove is formed in the oxide magnetic material or both Eii 'l'+ 73 materials can be selected depending on the use of the composite.゛Two Hands, 4＼Komyo will be explained in more detail by way of examples.

The fruit is l! i''ll 1 As shown in Figure 51, the coefficient of thermal expansion is 152X 10
-'/°C, 3X25X lt Sendust with saturation magnetic flux density 10.0OOG and heat 1 engraving coefficient?
Mn − of 3X25X3j which is 144xH)-'/℃
7-n type F1F rh (Fc203: 56 mol%,
M II O: 42t) Ii '36, ZnO: 2
．． 0 mol%) bonding surface? ill polished, flat surface x04
A ferrite block 2 was prepared by polishing the Iζrendust block 1 (13) to a surface roughness of 0.03μ within 1μ.
25m1 of Tsuku 2! Medium Q parallel to the direction, 3+11+
No. 8: +'i'+ Create a groove 2 with 3 grooves 3, and heat the groove 3 with a tensile modulus of 148X 10
A glass rod 4 of a stainless steel cuff at -'/°C was inserted. This -L is layered with Lengst's polished block 1 (Shunref mix (1) [C-shaped U-shaped jig 5]
Inside the cellar 1-shi, Renomix "C" was made and IC wedge 6
゛Fixed lζ. Insert it into the furnace and heat it in a nitrogen atmosphere.
Heat it for a while, cool it, melt 81 Nijikarasu 7, lengthen and M, n -7II] J Lie 1.
Composite 8 of ~ was obtained.

No cracks or the like were observed at all in this composite 8, and it was cut vertically to a thickness of 150 μm (IT).
I] TJJ, quality jA Regardless of the amount of material, no peeling or cracking was observed. Also, the side surface of this thin plate was polished 10
As a result of microscopic observation at a magnification of 00x, the area 10 where the C dust and ferrite are in direct contact has a J as shown in Fig. 1(a).
, no penetration of sea urchin glass 7 was observed. For reference, the thermal expansion coefficient of Sendust and 1 are added to the length above.
Mn-71) fuco-phyto(t-e20) with a thermal expansion coefficient of 130'X IO-'/'C that differs by 5%:
+: 52 mol%, IVI 110: 40 mol%, 7n
○: 134x 10' which is 12% different from ゛8 mol%)
, Mn, -Z11, which has a thermal tensile coefficient of y''C
Ferrai 1-(Fe2032 58 mol%, MrlO:
34'l%, 7nO: 8 mol%) to form Composite 1 in the same manner as in the above example. In the former, cracks occurred in the glass part and in the 1711~ part, making it impossible to obtain a practical thickness, and in the latter, cracks were observed in the composite and the result was 4J, but as a result of cutting it into a thickness of 150μ, The length and ferrite peeled off, and the actual I'-1
I can't get 1) and I can't get it.

Based on this result, we used a composite material with a 6% difference in thermal expansion coefficient between internally magnetic materials, as shown in Figure 2 (a).
- A magnetic head 11 for a reader was manufactured.゛JBL, which manufactures magnetic heads from the composite of the present invention, is completely incompatible with the conventional "J" + J process, which manufactures magnetic heads from a single ferrite.
Therefore, C1 composite of the present invention was carried out using the conventional magnetic core (Δ material Ferra I-05 (4\double). 11 official approval has been given that it can be handled as F+i.

There is a C of 70μ. As a result of evaluating the characteristics of this magnetic head, it was found that the
<,,> It is possible to record on i-tape, and in the high frequency region C, 11", 32 people are fewer, and compared to conventional ferrite alone (
It was found that the loss was equivalent to that of a magnetic head.

Also, for reference, a composite Iho in which ferrite is bonded to length 1 through a glass layer with a thickness of 1 μm is prepared, and the JJ, Una TI, and Niki heads are similarly shown in Figure 2 (l)). As a result of fabricating it and evaluating its characteristics, it was found that both the recording and endogenous characteristics were insufficient for practical use. IJ゛O Figure 2 (
C) shows an fQ head made of conventional single crystal ferrite for reference.

Figures 3 and 4 show another method for producing the composite of the invention.

For example, the method shown in the JJ diagram uses the ferrite block 2
A glass plate 4 is placed in the leakage 33 formed in the hole 33, and heated. I made a block 1'' block 2 with the sword lath 7 buried in the groove 3, and finished the joint surface of this block 2.L, Dust block 1 is a car! Melt the horn lath that was set up again in step a, and join the lock 2 and length block 1 to form a composite a ∆I.
This is the manufacturing method of No. 8.

9)/1 The method shown in Fig.
[1) Empty IR to prevent glass from coming into direct contact with 2. Fig. 4 (one) shows how to form a groove 12 in which the crows 7 that have flown out are accommodated. Form the diverted glass storage surface 12 at a separate location. According to the /j method, bury the glass as shown in Figure 4 (E). Figure 4 (g) shows how to tie the cufflinks. ll
'U-shaped groove 3 facing the magnetic material (suru-nawate/pl
;l 1'! How to cover the spilled glass forming 12 A3
．． J: σ Figure 4 (G) forms 3 which places the glass (
J and 6 form fAH out glass accommodation f1ili12 and the ten thousand payment is made small/: b.

As described above, the present invention has J, IJ, Nt aggregates having high saturation magnetic flux density, gold bendability +A fil, and low IQ.
'J,', oxide magnet 1" 4A size is strongly bonded with glass, and the internal magnetic grindstone is in direct contact with it.)
(-Since there is
q, recordability on high coercive force magnetic tape tt
e 'fil, and there is less JR loss in the high frequency range (g: to produce a magnetic spatula 126, and to produce a magnetic spatula 126, the composite of the present invention has a conventional An example of this is the production of a magnetic head using a single unit of I0 Noi 1, which can be handled in one production cycle, and therefore (
It can be easily mass-produced without changing the conventional 1117'', and it is collectively extremely useful.

[Brief explanation of drawings]

FIG. 1 is a process diagram showing the composite ferrite of the present invention.
a) Figure 1.1 Enlarged view of part A in Figure 1, Figures 2 (a), (b)
) and (c,) are V −T′ l′<internal head J3 and Mn-7n single crystal VTR1! ! ! Fig. 1 is a diagram of a substitute head, Fig. a'53 is a drawing of the assembly process of other embodiments of 79-gou facies 1 to 1 of the present invention, and Fig. 4 is a diagram of the 10 structure of the present invention for preventing glass penetration.
sell. 1...Length block 2...Fuerai 1 to block 3...1''44...Crow 4 grade 5...Jig-6...Caulking jig 7...Glass 8...Pieces Invention of longst and ferrite composite 9.
・・Thin plate 10 cut from the Lengst-Fue-Fei 1~complex...Part 11 in direct contact with the Sendust-Fue-Fei 1~...Magnetic head 12...Groove Patent applicant Nippon Insulator Co., Ltd. Figure 2 <a) (b) (C)

Claims (1)

[Scope of Claims] 1. A cast body comprising a part where a metal magnetic material and an oxide magnetic material are in direct contact, and a part where the inner magnetic material is joined via glass. 2. A combination of abrasive materials was used in which the difference between phase Ii in the coefficient of thermal expansion of each of the gold 177S magnetic material, the oxide magnetic material') 3, and the glass bonding the internal magnetic material was within 10%. The a mortar body according to claim 1, characterized in that: 3. A metal magnetic material and an oxide magnetic material are layered on at least one of them7. 4. Metal magnetic (3 size or Fe "AJ2- 5. The composite according to any one of claims 1 to 3, wherein the oxide magnetic material η' is a ferrite and is an 8i-based alloy or a Fe-NI-based alloy. , the metal magnetic material is a Fe-A° C.-3i base metal, and the oxide magnetic material is Mll-Zllll F1 r: according to any one of claims 1 to 3. The composite fA of 6. The composition of Mll-711 Ferai 1- is F(!
20:+: 52-65 mol%, MIIO: 28-4
8 mol%, 7nO: range of 0 to 7 mol% (Claim No. 5, JJJ Note 79, in which the presence of J is defined as 1 degree J sign)
Go 1 ho. 7, a) Metallic magnetic material and oxidized magnetism 4″I: At4 <
'+((1)-t4'1 Each joint surface is smoothed'7 culm, b) Metal magnetic material 1'i1 and oxidized magnetodynamic +l+:
? Forming a groove or a depression on at least one side of A8'11 (C) forming a groove or depression on at least one side of the groove or depression, and (d) overlapping the inner magnetic material. 1. A method for producing a composite, comprising the steps of: combining and heating the grains to soften the grains, and then joining the both magnetic materials together. 8. Step C>) Place glass on or near R or the depression, melt the glass, bury it in the groove or depression, and remove the glass attached to areas other than the groove or depression and join. 8. The method for producing a composite according to claim 7, wherein u'i is a step of smoothing the surface. 9. Metallic magnetic material or nν with smooth bonding surface
Form a vortex or depression for installing glass, and also form an empty vortex or depression in the vicinity of the groove or depression without installing glass, or use a pre-formed groove or depression. Melt glass in the depression and do CI
'! ! After installing the glass, form an empty groove or depression in contact with or near the groove or depression in which the glass is buried.
When heating the inner magnetic materials by overlapping them to melt the glass and bonding the inner magnetic materials, the structure is designed to prevent the glass from penetrating into the parts that are in direct contact with the inner magnetic materials J $3. The jΔ method for producing composites is characterized by the following.