JPS6041138B2 - Amorphous magnetic alloy thin plate for magnetic heads - Google Patents

Description

[Detailed description of the invention] 1 Background of the invention Technical field The present invention relates to an amorphous magnetic alloy thin plate for a magnetic head.

Prior art and its problems As one of the magnetic head forming materials, an amorphous magnetic alloy thin plate containing mainly Co as an iron group transition metal element and further containing about 20 to 3 t% of a vitrifying element is known. ing.

When Ru is added to such an amorphous magnetic alloy, corrosion resistance and the like are improved, and the alloy exhibits extremely good characteristics.

On the other hand, when Mn is added to such an amorphous magnetic alloy, the Curie temperature Tc can be reduced without affecting the saturation magnetic flux density, and the difference from the crystallization temperature Tx (Tx - Tc) It is also known that the magnetic field becomes larger, heat treatment becomes easier, magnetic permeability improves, and high saturation magnetic flux density can be obtained.

Therefore, if Mn and Ru are added in combination to the above-mentioned amorphous magnetic alloy, it is expected that it will exhibit extremely good characteristics. However, when Mn and Ru are added in combination in this manner, the following disadvantages occur when a master alloy containing Mn and Ru is melted and thinned by a high-speed quenching method.

In other words, if rapid cooling is performed in the air without using a vacuum or inert gas atmosphere as the atmosphere for injecting the molten metal from the injection nozzle to the cooling body, a slag layer will be formed at the tip of the injection nozzle. Continuous groove-like defects occur on the surface of the obtained thin plate, and the surface properties of the thin plate deteriorate.

Moreover, this slag layer may stop the ejection of port hot water, making production impossible. For this reason, there are inconveniences such as not being able to manufacture a large amount of thin plates all at once and having to replace the nozzle frequently. 0 Purpose of the Invention The present invention was made in view of the above circumstances, and
The main purpose of this is to eliminate the inconvenience of forming a slag layer at the tip of the injection nozzle during sheet thinning using the high-speed quenching method, which deteriorates the surface properties of the thin sheet and makes manufacturing impossible. It is an object of the present invention to provide an amorphous magnetic alloy thin plate for a magnetic head of Ru composite addition type.

The inventors of the present invention have conducted extensive research on such objects and have found that such objects can be achieved by adding Zr in addition to Mn and Ru, leading to the present invention.

That is, the present invention is an amorphous magnetic alloy thin plate for a magnetic head characterized by having a composition represented by the following formula.

Formula TxR MnzZrWXv {In the above formula, T represents Co, or Co and Fe, or a combination of Co or Co and Fe with one or more other transition metal elements, and X represents B or Si
and B, or a combination of B or Si and B and one or more other vitrifying elements.

x+y+z+w+v=10th t%, of which y
is less than t%, z is less than t%, w is 0. Spot t% or less,
v is 18-3$t%. Furthermore, when Fe is included in T, the amount of Fe is 5. Already less than t%. }m Specific Configuration of the Invention The specific configuration of the present invention will be described in detail below.

The thin plate of the present invention contains Zr in addition to Ru and Mn.

In this case, elements other than Zr will not achieve the desired effects of the present invention. In the above formula, other additive elements added in combination with Fe and Co as necessary in T include Fe and Co and transition metal elements other than Mn, Ru and Zr (Sc~Zn; Y~ Cd;Ne~H
g; Ac or higher), such as Ni, Hf, V, Nb,
Specific examples include one or more of Ta, Mo, W, Rh, Pd, Os, lr, and Pt.

On the other hand, × is B, Si and B, or B or Si
A combination of B and one or more other vitrifying elements is preferred. In this case, B or S as necessary.
Examples of other vitrifying elements added in combination with i and B include one or more of P, C, W, Sn, AI, and the like.

On the other hand, in the above formula, x+y+z+w+v=1
Under the condition of 0 scale t%, the Ru addition amount y is less than or equal to the total t%.

This is because if the unevenness exceeds t%, the saturation magnetic flux density, corrosion resistance, and wear resistance will decrease, and the surface properties and punching workability of the thin plate will also decrease. In this case, the Ru addition amount y is 0.5 to
When it comes to t%, even more favorable results are obtained. On the other hand, in the above formula, the Mn addition amount z is t%.

This is because when the base t% is exceeded, the effect of lowering the Curie point without lowering the saturation magnetization is no longer produced. In this case, when the Mn addition amount z decreases, the effect of the addition becomes less significant, so z is set to 0.
Preferably, it is t%.

Further, when z is 1 to t%, even more favorable results are obtained. On the other hand, the Zn addition amount w is 0. Pine t% or less.

w is 0. If the content exceeds t% of candy, a slag layer will be formed at the tip of the injection nozzle, causing the same problem as described above. this is,
This is thought to be due to Zr's strong affinity for oxygen. Note that when w is 0.1 at%, the formation of a slag layer at the tip of the injection nozzle is not significantly eliminated, so w
is 0.1~0. Sheath t%, more preferably 0.1-0.3
Preferably, it is t%.

Furthermore, the added amount v of the vitrification element component X is 18 to 3&t
%.

When v is less than 1 t%, it becomes difficult to make the steel amorphous, and when v exceeds 3 t%, the saturation magnetic flux density decreases and it becomes difficult to make it amorphous.

Note that the T content x is 100-y-Z-W-V, which is 50.2 t% or more and less than 82 t%, but 50.2
It is preferable that it is 80.9 t%. In this case, T includes Co or Co and Fe. The elemental composition ratio in T is selected so that the strain is close to zero.

That is, the content of Fe is 0 or 5. It is set to be t% or less.

Fe content is 5. If it exceeds t%, the magnetostriction becomes large, and the magnetic permeability decreases due to various stresses in the magnetic head manufacturing process. Note that T contains Fe, and if the Fe content is 1. 5-5.8t%, more preferably 2-5. When it is $t%, more favorable results are obtained in terms of magnetostriction.

On the other hand, the Co content is preferably 4% or more.

When the Co content is less than 4 t%, the saturation magnetic flux density decreases. In this case, more preferable results are obtained when the Co content is 40 to 8 t%, more preferably 50 to 7 t%.

Furthermore, as mentioned above, within the above content range, T can be composed of Co or only Fe and Co.
or may consist of Fe and Co and one or more of the other elements listed above.

When T contains Co or one or more other elements in addition to Fe and Co, the other elements usually have a total content of up to 1 Mt%.
It can contain up to

If the content exceeds this range, problems such as decreased Bs and poor surface properties will occur. One example of such an element is Ni.

Addition of Ni has the effect of replacing Co and reducing material costs, but as the amount of Ni increases, Bs decreases, so the Ni content is preferably pine t% or less. On the other hand, as one or more other elements, iron group (Fe, Co, N
i), Ru, Mn, and Zr may be transition metal elements, but the total amount of one or more of these other transition metal elements is preferably 1% or less.

At this time, the decrease in Bs is small, and excellent effects unique to each additive element are realized. Among these elements, in particular,
One or more of Ta, W, Mo, etc. can be mentioned.

On the other hand, the vitrification element component X has B or Si and B as essential components.

In this case, the B content is 18~3&t% and the Si content is 0.
When the content is 7 at%, Bs becomes high, the surface properties of the thin plate improve, and favorable results are obtained.

The B content is 15.2 to 2 t%, and the Si content is 0.1 to 4. When it comes to pine t%, Bs becomes even higher,
The surface properties are further improved, and the effects of addition of additive elements such as R, Mm, and Z are also significant, resulting in more favorable results.

In addition, the Si/(Si+B) ratio in X is 0 or 0
．． It is preferably below 4.

In particular, 0.01 to 0.3, more preferably 0.01 to 0.3, more preferably 0.01 to 0.3.
05 to 0.2, more favorable results are obtained. Note that the vitrification element component x may contain one or more elements other than Si and B, if necessary.

However, the total is 0. If it exceeds the base t%, it becomes difficult to become amorphous, so the content should be 0. Preferably, it is chord t%. A thin plate having a composition as detailed above is an amorphous material having substantially no long-range regularity.

Further, the plate thickness is generally about 10 to 200 mm. Such an amorphous magnetic alloy thin plate is usually manufactured as follows. That is, an alloy of a corresponding composition is ultra-quenched from the gas phase or liquid phase.

In this case, the alloy is usually made into a melt, and one pi is removed from the liquid phase. ○
/sec or more, usually 1 to 1 pi. An amorphous magnetic alloy thin plate is obtained by ultra-quenching and solidifying at a cooling rate of 0/sec.

In order to super-quench a molten alloy, the molten alloy may be injected from a nozzle and quenched according to various known methods such as a twin roll method, a single roll method, and a far zero quenching method, particularly a single roll method. Note that the atmosphere during manufacturing does not matter.

That is, even if the sheet is thinned by rapid cooling in the atmosphere, there is almost no formation of a slag layer at the tip of the injection nozzle. W. Specific Effects of the Invention Such amorphous magnetic alloy thin plates are laminated together, preferably with an insulating adhesive layer interposed therebetween, to form core halves of a desired shape, and these are butted together to form a core half for a magnetic head. It is used as a core, especially a core for a magnetic head such as an audio device.

Alternatively, the thin plates are not laminated, but the thin plates themselves are used as core halves of a desired shape, and the core halves are butted together to form a core for a magnetic head, particularly a core for a magnetic head for video or the like.
Incidentally, FIG. 1 shows an example in which the present invention is applied to an audio magnetic head.

In the figure, 2 and 2' are a magnetic head core formed by laminating amorphous magnetic alloys, 3 is a dummy block, 4 is a shield case, and 5 is a support part, from which a magnetic head 1 is formed. ing. A magnetic head can usually be manufactured as follows.

First, preferably, a predetermined heat treatment is performed on a thin plate obtained by an ultra-quenching method.

This heat treatment may be, for example, a moth dulling treatment in a non-magnetic field at a temperature below the crystallization temperature and above the Curie point, particularly for the purpose of removing internal strain, or a heat treatment below the crystallization temperature and the Curie point. It may also be annealing treatment performed at high temperature in a magnetic field for the purpose of removing strain and improving magnetic properties.

As for the latter process using a rice bran hammer in a magnetic field, either a static magnetic field, a rotating magnetic field, or the like may be used. These dull heat treatments and their conditions may be appropriately selected from the composition of the amorphous magnetic alloy and the desired magnetic properties. Next, such amorphous magnetic alloy thin plates are usually punched into a predetermined shape using a die, and a plurality of the sheets are generally stacked together in a predetermined track using an insulating adhesive to form the core half. Create. Note that the above heat treatment may be performed after this punching. In some cases, if necessary, photoetching may be used instead of punching, or when forming a laminated core, core halves may be obtained by grinding from the laminated thin plates. Furthermore, especially when used as a video magnetic head, there is usually no need to laminate thin plates. After this, the core halves are usually wound.
After inserting this into the core holder and polishing the gap abutting surfaces, gap forming material is provided in the gap at a predetermined interval, the core halves are butted together to form a core, and then stored in a shield case and made of resin. A magnetic head is manufactured by molding.

The core for a magnetic head produced in this manner is extremely useful in any application, such as audio, video, computer, card reader, etc., and especially as a core for a contact type head. V. Specific Effects of the Invention According to the present invention, the formation of a slag layer at the tip of the injection nozzle is extremely reduced even when the plate is thinned by a high-speed quenching method in the atmosphere.

As a result, there are fewer defects on the surface of the thin plate or production failures, large quantities can be manufactured at once, fewer nozzles need to be replaced, and the thin plate does not need to be re-polished. This is extremely advantageous in terms of manufacturing.

Moreover, the thin plate is easy to heat treat and has a high saturation magnetic flux density.

Furthermore, it exhibits extremely good properties such as wear resistance, corrosion resistance, and punchability, making it extremely useful as a material for magnetic heads.

W Specific Examples of the Invention Hereinafter, specific examples of the present invention will be shown and the present invention will be explained in further detail.

EXAMPLE An amorphous magnetic alloy thin plate having a composition shown in Tables 1 and 2 below and having a thickness of 45 cm was obtained.

Thinning is one piece.

The slit length of the injection nozzle was 5 bars, and the slit width was 0.1 bar according to the high-speed quenching method of the Le method. The cooling roll was made of mild steel and had a rotational speed of 300 pm. For each melt, 50 mm of the corresponding master alloy was melted, and this was injected onto a cooling roll at a jetting rate of 5 mm/min in the atmosphere to obtain a thin plate.

Using the same nozzle, ``manufacturing is repeated several times,
The accuracy of the plate thickness due to defects on the surface of the obtained thin plate is ±3
Tables 1 and 2 below show the number of times the nozzle was used within m m.
Shown below.

Note that the number of times of use is 0 means that there were many defects on the surface and a plate thickness accuracy of ±3 mm or more could not be obtained during one production.

Further, Tables 1 and 2 show the Curie point Tc, crystallization temperature Tx, and saturation magnetic flux density force of the obtained thin plates.

On the other hand, various audio magnetic heads as shown in FIG. 1 were manufactured using each thin plate.

That is, each thin plate was heat treated at a temperature between Tc and Tx, and then punched into a substantially C-shape using a cemented carbide die.

Next, using multiple pieces of each punched body, apply an epoxy adhesive to one side of the punched body, stack them to a thickness of 0.6, and heat and harden them to form a core half. I got it.

Thereafter, each of the core halves was wound and housed in a core holder, and the gap abutting surfaces of the core halves were ground and polished to a mirror finish.

Then, the core halves were butted together with a predetermined gap in accordance with a conventional method to form a magnetic head core 2, and an audio magnetic head 1 made of each thin plate was produced. For each audio head obtained in this way, y-Fe20
The amount of wear was measured using a coated tape containing No. 3 as magnetic powder.

That is, this tape was heated at 25°C and relative humidity 60-65%.
The test piece was run for 100 hours at a running speed of 4.75 arc/sec, and the wear depth after running was measured using a surface roughness meter.

The results were converted into values per 10 calm hours and are shown in Tables 1 and 2 below. Separately, each magnetic head is
After leaving the adhesive for 16 hours at 0oo and relative humidity of 90 to 95%, the f characteristic deterioration (dB) of 315HZ/14KH2 was measured to evaluate corrosion resistance.

The results are shown in Tables 1 and 2 below. Table 1 Table 2 From the results shown in Tables 1 and 2, the thin plate of the present invention
The formation of a slag layer at the tip of the nozzle is small, the number of times the nozzle can be used is high, and at the same time, the difference between Tc and Tx is large, heat treatment is easy, and the saturation is high.Furthermore, as a magnetic head, it has good wear resistance and corrosion resistance, and is From a general perspective, it can be seen that it exhibits extremely good characteristics.

[Brief explanation of the drawing]

Figure 1 shows the amorphous magnetic alloy thin plate of the present invention used in a magnetic head.
FIG. 3 is a perspective view showing an example of this application. 1... Magnetic head, 2... Core for magnetic head.

Claims (1)

[Claims] 1. An amorphous magnetic alloy thin plate for a magnetic head, characterized by having a composition represented by the following formula. Formula T_xRu_yMn_zZr_wX_v {In the above formula, T represents Co, or Co and Fe, or a combination of Co or Co and Fe with one or more other transition metal elements, and X represents B, or Si and B
, or B or a combination of Si and B with one or more other vitrifying elements. x+y+z+w+v=100at%, of which,
y is 8at% or less, z is 6at% or less, w is 0.8at%
% or less, v is 18 to 35 at%. Furthermore, when Fe is included in T, the amount of Fe is 5.6 at%. }2
The amorphous magnetic alloy thin plate for a magnetic head according to claim 1, wherein the Fe content is 1.5 to 5.6 at%. 3 X is B, or B and Si, or a combination of B or B and Si and one or more other vitrification elements, and the Si/(Si+B) ratio in X is 0 or 0
．． 4 or less, an amorphous magnetic alloy thin plate for a magnetic head according to claim 1 or 2. 4. The amorphous magnetic alloy thin plate for a magnetic head according to claim 3, wherein the Si/(Si+B) ratio is from 0.01 to 0.3. 5. The amorphous magnetic alloy thin plate for a magnetic head according to claim 1, wherein y is 0.5 to 8 at%. 6. The amorphous magnetic alloy thin plate for a magnetic head according to claim 1, wherein z is 0.5 to 6 at%. 7. The amorphous magnetic alloy thin plate for a magnetic head according to any one of claims 1 to 6, wherein w is 0.1 to 0.8 at%.