JPH06293943A - Magnetic material with high core loss - Google Patents

Abstract

PURPOSE:To obtain a magnetic material of Fe-Al alloy having high core loss. CONSTITUTION:This magnetic material has a composition consisting of 2-14wt.% Al and the balance essentially Fe. Further, it is preferable to incorporate, besides the above, 0.01-5.0wt.%, in total, of one or >=2 kinds among Li, Be, B, Mg, Si, P, S, Sc, Mn, Co, Ni, Cu, Zn, Ga, Ge, Y, In, Sn, Sb, Ba, and rare earth elements. By incorporating these components, magnetic properties can be improved to a greater extent. Moreover, if necessary, various components are incorporated to improve corrosion resistance, brittleness, and machinability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high iron loss magnetic material suitable as an induction heating material in an electromagnetic cooker or the like.

[0002]

2. Description of the Related Art Conventionally, the problems to be solved by the invention
As the soft magnetic material, Si-containing Fe-based alloys such as silicon steel and Fe-Ni alloys such as permalloy are known as typical ones, and iron cores of motors, generators, relays, transformers and electromagnets are known. , Used as an iron core for magnetic heads.

This kind of soft magnetic material has hitherto been studied exclusively in the direction of reducing iron loss, which is the sum of hysteresis loss and eddy current loss. Here, the eddy current loss means an energy loss due to an eddy current when an electromotive force is induced by an electromagnetic induction action and an induced current flows in a vortex when an alternating magnetic field acts on the material.

The soft magnetic material is also used as an induction heating material in an induction heating device by utilizing the heat generated by its iron loss. In this case, it is desirable that the iron loss of the material is large.

However, as the conventional induction heating material, for example, the induction heating material in the electromagnetic cooker, only the existing iron, stainless steel and the like have been used so far, and these have the above-mentioned iron loss, that is, heat generation performance. Was hard to say.

[0006]

The present invention has been made to solve the above problems, and the gist thereof is that the composition of the magnetic material contains Al: 2 to 14% by weight, and the balance substantially. To have a composition of Fe.

About 60 to 70% of the iron loss is due to the generation of eddy current, and the generation of the eddy current depends on the magnetic flux density and the electrical resistivity when a magnetic field is applied to the material. Involved.

Thus, the larger the magnetic flux density, the more eddy current is generated, but the electric resistivity is not uniform, and there is a range of electric resistivity suitable for generating a large amount of eddy current. There is.

According to the present invention, by containing Al in Fe and by setting the content thereof to a predetermined amount, the magnitude of electric resistivity can be made appropriate while keeping the magnetic flux density as high as possible. It was made under the knowledge that the iron loss can be increased, and the high iron loss magnetic material of the present invention is
It can be suitably used as a material for induction heating.

In the present invention, Al: 2 to 14% by weight
In addition to Li, Be, B, Mg, Si, P, S, S
c, Mn, Co, Ni, Cu, Zn, Ga, Ge, Y,
In, Sn, Sb, Ba, one of rare earth elements or 2
It is desirable to add 0.01 to 5.0% by weight in total of the seeds or more, and this makes it possible to adjust the electric resistivity value to a better value while avoiding a decrease in magnetic flux density as much as possible.

In addition to these components, Cr, R
It is desirable to contain 0.01 to 5.0% by weight in total of one or more of u, Rh, Pd, Ag, Os, Ir, Pt, and Au. By including these components, the corrosion resistance of the material can be improved.

Furthermore, C: 0.5% by weight or less and / or N: 0.05% by weight or less, Ti, V, Zr, Nb, M
When one or more of o, Hf, Ta, and W are contained in a total amount of 0.01 to 5.0% by weight, brittleness can be improved, which is desirable.

In the present invention, in addition, Ca, Se, T
The total amount of one or more of e, Pb, Bi is 0.
It is preferable that the content is 005 to 2.0% by weight, so that the free-cutting property of the material can be improved.

Next, the reasons for limiting each component of the present invention will be described in detail below. [Reason for limitation] Al: 2 to 14% by weight Al is one of the main components of the material of the present invention, and is 2% by weight.
If it is less than 1, the electric resistivity is low and a large iron loss cannot be obtained. On the other hand, if it exceeds 14% by weight, the magnetic flux density becomes low and the iron loss also becomes small.

Li, Be, B, Mg, Si, P, S, S
c, Mn, Co, Ni, Cu, Zn, Ga, Ge, Y,
In, Sn, Sb, Ba, rare earth element: one or two
0.01 to 5.0% by weight in total of at least one species These elements are required to be 0.01% by weight or more in total to improve magnetic properties. However, if it exceeds 5.0% by weight, the magnetic flux density is reduced and the iron loss is reduced.

Cr, Ru, Rh, Pd, Ag, Os, I
r, Pt, Au: One or a total amount of two or more is 0.
01 to 5.0% by weight These elements are effective in improving corrosion resistance when the total amount is 0.01% or more. However, if it exceeds 5%, the magnetic flux density will decrease.

C: 0.5 wt% or less, N: 0.05 wt% or less Ti, V, Zr, Nb, Mo, Hf, Ta, W: 0.01 to 5 in total of one or more. 0.0 wt% C, N and Ti, V, Zr, Nb, Mo, Hf, Ta, W
And are effective in improving brittleness by forming carbides and nitrides and refining crystal grains. In particular, if Al exceeds 10% by weight, it becomes brittle, so these components are added as necessary. The lower limit values are Ti, V, Zr, Nb, Mo, Hf,
The total amount of Ta and W is 0.01% by weight. However, when the content is more than 5% by weight, the magnetic flux density is reduced and the iron loss is reduced.

Ca, Se, Te, Pb, Bi: 0.005 to 2.0% by weight in total of one kind or two or more kinds. These are effective for improving the free-cutting property, so that the total amount is 0 if necessary. 0.005 wt% or more is contained. However, if it exceeds 2.0% by weight, the magnetic flux density is lowered and the iron loss is reduced.

[0019]

EXAMPLES Examples will be described in detail below to further clarify the characteristics of the present invention. Alloy 30 of various components shown in Table 1
Then, kg was melted in a vacuum induction furnace and forged into a round bar having a diameter of 40 mm, and a ring-shaped test piece having an inner diameter of 25 mmφ, an outer diameter of 35 mmφ and a thickness (height) of 3 mm was produced from this. The test piece was heated in a temperature range of 800 to 1100 ° C. in a vacuum, held for 2 hours, and then cooled in a furnace.

Next, the magnetic characteristics of the test piece after the heat treatment were measured by alternating current B
Measured with a -H tracer. Specifically, a magnetic field was applied to the test piece under the conditions shown in Tables 1 and 2, and B-
The area surrounded by the H curve was measured to determine the iron loss. The results are shown in Tables 1 and 2.

[0021]

[Table 1]

[0022]

[Table 2]

Since the magnitude of iron loss varies depending on the frequency and applied magnetic field conditions even for the same material, in Table 1, the test pieces made of various materials were measured under the same conditions. The results are shown in Table 2, and in Table 2, the magnitude of iron loss when the conditions are changed is shown. From the results of these tables, it is understood that a large iron loss can be obtained in the materials of the examples of the present invention.

The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention can be implemented in a mode in which various modifications are made based on the knowledge of those skilled in the art without departing from the spirit of the invention. is there.

[0025]

According to the present invention, it is possible to provide a magnetic material exhibiting high iron loss, that is, high heat generation performance. Such a magnetic material is suitable as a member for dielectric heating such as an electromagnetic cooker.

Claims (5)

[Claims] 1. A high iron loss magnetic material containing Al: 2 to 14% by weight and the balance being substantially Fe. 2. In addition to the components of claim 1 except for Fe, Li, Be, B, Mg, Si, P, S, Sc, Mn, C
o, Ni, Cu, Zn, Ga, Ge, Y, In, Sn,
Sb, Ba, and one or more of rare earth elements are contained in a total amount of 0.01 to 5.0% by weight, and the balance is substantially Fe.
High iron loss magnetic material consisting of. 3. In addition to the components of claim 1 or 2 excluding Fe, further Cr, Ru, Rh, Pd, Ag, Os, Ir,
0.01 in total of one or more of Pt and Au
A high iron loss magnetic material containing ˜5.0 wt% and the balance being substantially Fe. 4. In addition to the components of claim 1, 2 or 3 excluding Fe, C: 0.5% by weight or less and / or N: 0.0
5% by weight or less, Ti, V, Zr, Nb, Mo, Hf,
The total amount of one or more of Ta and W is 0.01 to
A high iron loss magnetic material containing 5.0 wt% and the balance being substantially Fe. 5. In addition to the components of claim 1, 2 or 3 or 4 excluding Fe, a total amount of one or more of Ca, Se, Te, Pb and Bi is 0.005-2.0 weight. % High iron loss magnetic material containing 100% by weight and the balance substantially consisting of Fe.