JP2701306B2 - Method for producing Fe-Co based magnetic alloy - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an Fe—Co-based magnetic alloy, and more particularly to a magnetic component having a high maximum magnetic permeability and a low coercive force, for example, a yoke material for a dot printer. , Magnetic circuit yoke materials, dot printer armatures, telephone diaphragms, and the like.

(Prior art) Generally, yoke material is Fe-49% Co-2% by weight.
Cold work materials such as V alloy (2V permendur) are widely used.

This 2V permendur has a relatively high saturation magnetic flux density, a low coercive force, and a high maximum permeability when it is a cold-worked material, but when it is a cast product, the coercive force increases,
The maximum permeability tends to decrease.

(Problems to be solved by the invention) However, when 2V permendur is used for a yoke component of a dot printer, for example, an eddy current is generated when the device is operated at high speed because of low electric resistivity, and heat is generated, thereby increasing the speed of operation. There was a problem that it was not possible. Further, there is a problem that the magnetic properties of cast products are deteriorated as compared with forged products and rolled products.

The present invention has been made to solve such a problem, and an object of the present invention is to contain V, Si, and Al in a Fe-Co alloy and further include Cr, Ni, Mn, and Ti as necessary. , Mo, Nb, W,
By adding one or more selected from Zr in a total amount of 10% by weight or less, the electric resistivity is increased, and in a cast product, the magnetic properties are improved by solution treatment.

(Means for Solving the Problems) The method for producing a Fe—Co-based magnetic alloy according to the present invention comprises:
0-60%, V5.0% or less (excluding 0), Si3.0% or less (0
), Al3.0% or less (excluding 0), C0.1% or less, and Cr, Ni, Mn, Ti, Mo, N
b, solution treatment of an alloy containing at least one selected from W and Zr in a total amount of 10% by weight or less and the balance substantially consisting of Fe from a temperature of 950 ° C or more at a cooling rate of 30 ° C / sec or more. Thereafter, annealing is performed at a temperature in the α phase (ferrite phase) region of 700 ° C. or higher.

The method for producing a Fe—Co-based magnetic alloy according to the present invention comprises
0-60%, V5.0% or less (excluding 0), Si3.0% or less (0
), Al3.0% or less (excluding 0), C0.1% or less, and, if necessary, Cr, Ni, Mn, Ti, Mo, Nb, W,
A cast body is made from a molten alloy containing at least 10% by weight of at least one selected from Zr and the balance substantially consisting of Fe, and the cast body is heated from a temperature of 950 ° C or more to 30 ° C / sec or more. A solution treatment is performed at a cooling rate, and thereafter, annealing is performed at a temperature in the α phase region of 700 ° C. or more.

The reason why the Fe—Co-based magnetic alloy of the present invention contains 40 to 60% of Co is that a high magnetic flux density can be obtained in this range.

The reason for adding Al is that Al increases the electric resistance and lowers the coercive force. The reason for setting the Al content to 3% or less is that if the content exceeds 3%, the cold forgeability deteriorates.

Si is added because Si has the effect of lowering the coercive force and increasing the maximum magnetic permeability, and since Si is an additive element that raises the electrical resistance, the alloy of the present invention is used in electric circuits such as magnetic circuit yoke materials. This is because when used as a device yoke material, there is an effect of reducing eddy current loss. The reason why the content of Si is set to 3% or less is that if it exceeds 3%, the material becomes brittle and the cold forgeability is reduced.

The addition of Cr, Ni, Mn, Ti, Mo, Nb, W, and Zr is for improving the toughness of the alloy, further increasing the electrical resistivity, and improving the magnetic properties.

The total content of these selected elements, Cr, Ni, Mn, Ti, Mo, Nb, W, and Zr, is set to 10% or less, because if it exceeds 10%, magnetic properties and the like are impaired.

The temperature of the solution treatment was set to 950 ° C. or higher because quenching is easy when quenching from a relatively high temperature γ phase, a martensitic structure is obtained, and the subsequent annealing converts the martensite phase to the α (ferrite) phase. This is because the crystal grains are coarsened by the driving force of the transformation, and the obtained magnetic alloy has a low coercive force and a high maximum magnetic permeability.

The reason why the cooling rate is set to 30 ° C./sec or more is that as the cooling rate is increased by water quenching, oil quenching, or the like, quenching is easily performed, and a low coercive force and a high maximum permeability are obtained as described above.

The reason for performing annealing at a temperature of the α phase region of 700 ° C. or more after performing the solution treatment is to improve the above-described magnetic properties, to improve cold workability, and to improve machinability. .

From the experimental data described below, it is preferable that a cast body is produced as compared with a forged body or a rolled body, based on the experimental data described later, that a cast body is produced from the Fe-Co-based magnetic alloy and that the cast body is preferably subjected to a predetermined solution treatment. This is because a low coercive force and a high maximum magnetic permeability were obtained.

(Example) An example of the present invention will be described.

Forged products, rolled products, and cast products were prepared from various molten alloys, and were subjected to predetermined solution treatment, heat treatment, and the like.
And for each product, electrical resistivity, coercivity,
The maximum magnetic permeability and magnetic flux density were measured. Here, the electric resistivity is 5 mm in diameter x 100 mm in length, and the magnetic characteristics are 45 mm in outer diameter and 33 m in inner diameter
Each test piece having a height of 7 mm and a height of 7 mm was evaluated. Magnetic flux density is applied magnetic field
Measured at 250e.

 Hereinafter, examples of the present invention will be described.

Examples 1 to 7 In these examples, the composition of the alloy was 0.005% C, 49.1% C
o, an alloy consisting of 0.1% Si, 0.05% Al and the balance Fe
A casting was prepared from this molten alloy, and after various solution treatments, annealed. Solution treatment conditions and annealing conditions are as shown in Table 1.

The electrical resistivity and magnetic properties of the obtained product were measured. The measurement results are as shown in Table 1.

In Table 1, the symbol WQ indicates water quenching (cooling rate of about 400
° C / sec) OQ means oil quenching (cooling rate about 150 ° C / sec) AC means air cooling (cooling rate about 10 ° C / sec), (α),
(Γ) indicates the state of the phase at the solution treatment temperature. hr indicates time.

As is clear from Table 1, in Example 3, the solution heat treatment was performed at a temperature of 1100 ° C. for 30 minutes, water quenching, followed by annealing at 850 ° C. for 3 hours.
It can be seen that the coercive force is the lowest, the maximum magnetic permeability is the highest, and the magnetic properties are excellent as compared with the other Examples 1, 2, 4 to 7.

Examples 8-10 These examples show that 0.007% C, 48.7% Co, 2.0% V,
An alloy consisting of 0.15% Si, 0.10% Al and the balance Fe was melted, and a casting was prepared from the alloy, and was subjected to a predetermined solution treatment and annealing. The electrical resistivity and magnetic properties of these products were measured.

The results of the solution treatment conditions, the annealing conditions, and the magnetic properties are as shown in Table 1.

As is clear from Table 1, in Example 10, the casting was
The solution was kept at 50 ° C. for 1 hour, subjected to a solution treatment by water quenching from this temperature, and then kept at 830 ° C. for 2 hours and then 200 ° C./h
Annealed at a cooling rate of r. The tenth embodiment has a lower coercive force, the highest maximum magnetic permeability and the highest magnetic flux density as compared with the eighth and ninth embodiments.

Examples 11 and 12 These examples show that 0.008% C, 49.0% Co, 1.8% V,
An alloy consisting of 0.09% Si, 0.05% Al and the balance Fe was melted to produce a rolled product from the molten metal, and the rolled product was subjected to solution treatment and annealing shown in Table 1. Then, the electric resistivity and the magnetic characteristics were measured. The results are as shown in Table 1.

In Examples 11 and 12, both the coercive force is low, the maximum magnetic permeability is high, and the residual magnetic flux density is a relatively high value.

Examples 13 and 14 These examples demonstrate that 0.004% C, 48.5% Co, 1.5% V,
An alloy consisting of 0.5% Si, 0.5% Al and the balance Fe is melted to form a cast product. The cast product is subjected to solution treatment and annealing as shown in Table 2, and the obtained product is subjected to electrical resistivity. And the magnetic properties were measured. The results are as shown in Table 2.

Example 14 has a lower coercive force, a higher maximum magnetic permeability, and a higher residual magnetic flux density than the example 13 in which the solution treatment was not performed, and has relatively excellent magnetic properties.

Examples 15 and 16 These examples demonstrate that 0.011% C, 48.0% Co, 1.3% V,
An alloy consisting of 1.8% Cr, 1.0% Si, 0.9% Al and the balance Fe is melted to produce a casting from this molten metal, which is subjected to a predetermined solution treatment and annealing, and then the electrical resistivity and the magnetic properties are determined. It was measured. The results are as shown in Table 2.

Example 16 had a solution treatment temperature of 1100 ° C. compared to Example 15.
And the annealing temperature is as low as 800 ° C. As a result, Example 16 had lower coercive force, higher maximum magnetic permeability, and higher residual magnetic flux density than Example 15.

Examples 17 and 18 These examples demonstrate that 0.021% C, 47.5% Co, 1.2% V,
An alloy consisting of 1.0% Ni, 0.5% Mn, 1.5% Si and 0.6% Al balance Fe is melted to produce a cast product, which is subjected to a prescribed solution treatment and annealing, and then to electrical resistivity and magnetic properties Was measured. The results are as shown in Table 2.

Example 18 had lower coercive force, higher maximum magnetic permeability, and higher magnetic flux density than Example 17 in which no solution treatment was performed.

Comparative Example 19 In Comparative Example 19, an alloy composed of 0.005% C, 49.3% Co, and the balance Fe was melted to produce a cast product, and thereafter the annealing shown in Table 2 was performed without performing a solution treatment. As a result of measuring the electrical resistivity and the magnetic properties, the results were as shown in Table 2.

Comparative Example 19 is an example in which V, Al and Si were not added. In Comparative Example 19, the electric resistivity was lower, the coercive force was lower, and the maximum magnetic permeability was lower than those of the above-described examples.

Comparative Example 20 In Comparative Example 20, 0.006% C, 49.0% Co, 1.5% V, 4.0% S
An alloy consisting of i, 1.1% Al and the balance Fe was melted to prepare a cast product, which was annealed as shown in Table 2 without being subjected to a solution treatment. Thereafter, the electrical resistivity and the magnetic properties were measured. The results were as shown in Table 2.

Comparative Example 20 is an example in which 4% of Si was added. As a result, the magnetic characteristics are high coercive force, low maximum magnetic permeability, and low magnetic flux density, and the magnetic characteristics are deteriorated.

(Effects of the Invention) As described above, according to the present invention, a solution treatment is performed from the γ phase region in the Fe—Co based magnetic alloy, and the subsequent annealing is performed in the α phase region, so that the ferrite phase is changed from the martensite phase. There is an effect that the crystal grains are coarsened by the driving force at the time of transformation to, and excellent magnetic properties such as low coercive force and high maximum magnetic permeability can be obtained.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical indication location C22F 1/10 C22F 1/10 E // C22F 1/00 660 8719-4K 1/00 660C 692 8719 -4K 692A

Claims (2)

(57) [Claims] 1. Co40 to 60% by weight, V5.0% or less (not including 0), Si3.0% or less (not including 0), Al3.0% or less (0%)
), C0.1% or less, and Cr, Ni,
At least one selected from Mn, Ti, Mo, Nb, W, and Zr
An alloy containing 10% by weight or less, and the balance substantially consisting of Fe,
A method for producing a Fe-Co-based magnetic alloy, comprising: performing a solution treatment from a temperature of 950 ° C or more at a cooling rate of 30 ° C / sec or more, and then annealing at a temperature of an α phase region of 700 ° C or more. 2. Co40 to 60% by weight, V5.0% or less (not including 0), Si3.0% or less (not including 0), Al3.0% or less (0%)
), C0.1% or less, and Cr, Ni,
At least one selected from Mn, Ti, Mo, Nb, W, and Zr
A casting is made from a molten alloy containing 10% by weight or less and the balance substantially consisting of Fe.
Solution treatment at a cooling rate of at least ℃ / sec, and then annealing at a temperature in the α phase region of at least 700 ° C.
Method of manufacturing magnetic alloys.