JP2018012883A - Soft magnetic alloy - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soft magnetic alloy having high saturation magnetic flux density and inexpensive price.SOLUTION: There is provided a soft magnetic alloy containing Ni, at least one kind selected from Al, Si and V and the balance Fe with inevitable impurities and having [Ni] and [M] existing in a zone surrounding by a straight line A, a straight line B, a straight line C, a straight line D, and a straight line E in a graph by plotting a relationship of [Ni] and [M], where Ni content is [Ni] and total content of Al, Si and V is [M] by mass%.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a soft magnetic alloy, and more particularly to a soft magnetic iron-based alloy capable of obtaining a high magnetic flux density.

  Soft magnetic materials are widely used as materials for electronic devices such as motors. With recent downsizing of electronic devices and the accompanying increase in current, soft magnetic materials require higher magnetic flux density. Has been. As the current increases, soft magnetic materials are required to have excellent soft magnetic properties, that is, a low coercive force and a magnetic flux density that does not tend to saturate in a high magnetic field strength region.

  For example, if the value of the current flowing through the coil constituting the motor is doubled, the number of turns of the coil necessary for obtaining the same output can be halved, and the motor can be reduced in size. For this purpose, it is necessary that the magnetic flux density of the soft magnetic material constituting the iron core does not reach saturation at the magnetic field intensity corresponding to the current value. On the other hand, if the magnetic flux density of the soft magnetic material constituting the iron core can be doubled, the same magnetic flux can be obtained even if the cross-sectional area of the iron core is halved, leading to the miniaturization of the entire motor.

  Pure iron is known as a soft magnetic material having a high magnetic flux density. As a soft magnetic material having a magnetic flux density exceeding that of pure iron, permendur which is an Fe—Co alloy is known. In addition to permendur, a high magnetic flux density soft magnetic alloy containing Co is known. For example, in Patent Document 1, 25.0 mass% or more and less than 30.0 mass% Co together with other additive elements is known. An iron-base alloy containing is disclosed. In addition, as a typical soft magnetic material, an electromagnetic steel plate (silicon steel plate) that is an iron-based alloy containing Si is known.

Japanese Patent Laid-Open No. 2006-19379

  In recent years, the residual magnetic flux density (Br) of permanent magnets used in motors has increased. Then, the soft magnetic material constituting the iron core and the yoke needs to follow such a high magnetic flux density and is required to have a large saturation magnetic flux density. An Fe—Co alloy represented by permendur can achieve a high magnetic flux density, but contains a large amount of Co, so it is very expensive and often has poor workability. Electrical steel sheets are inexpensive and exhibit relatively high magnetic permeability, but the magnetic flux density is not so high, for example, it is difficult to achieve a magnetic flux density of 1.7 T or higher.

  The problem to be solved by the present invention is to provide an inexpensive soft magnetic alloy having a high saturation magnetic flux density.

In order to solve the above-mentioned problems, a soft magnetic alloy according to the present invention contains Ni and at least one selected from Al, Si, and V, and the balance is made of Fe and inevitable impurities, and the mass% In the graph plotting the relationship between [Ni] and [M] where the total content of Ni is [Ni], Al, Si, and V is [M], the following straight lines A and B , [Ni] and [M] exist in a region surrounded by the straight line C, the straight line D, and the straight line E.
Straight line A: [M] = 0.01
Straight line B: [Ni] = 11.0
Straight line C: [Ni] = 11.0, [M] = 7.00 and a straight line connecting [Ni] = 3.0, [M] = 10.00 points Straight line D: [Ni] = 3.0, [M] = 10.00 A straight line connecting the points [Ni] = 0.1 and [M] = 7.00 Straight line E: [Ni] = 0.1

Here, in the graph, [Ni] and [M] may be present in a region surrounded by the straight line A, straight line C, straight line D, straight line E, and the following straight line F, straight line G.
Straight line F: [Ni] = 1.0, [M] = 0.01 and a straight line connecting [Ni] = 6.5, [M] = 3.50 A straight line G: [Ni] = 6.5

In this case, in the graph, the [Ni] and [M] may be present in a region surrounded by the straight line D, the straight line E, and the straight line G, and the straight line H and the straight line I described below.
Straight line H: A straight line connecting a point of [Ni] = 0.1, [M] = 0.50 and a point of [Ni] = 6.5, [M] = 3.50 Straight line I: [Ni] = 6.5, a straight line connecting the point [M] = 7.00 and the point [Ni] = 3.0, [M] = 10.00

  The soft magnetic alloy may further contain 1% ≦ Cr ≦ 14% by mass.

  The soft magnetic alloy may further contain 1% ≦ Mo ≦ 6% by mass.

  The soft magnetic alloy contains Cr and Mo, and is preferably 1% ≦ Cr + 3.3Mo ≦ 14% in mass%.

  Further, the soft magnetic alloy further has a mass% of 0.03% ≦ Pb ≦ 0.30%, 0.002% ≦ Bi ≦ 0.020%, 0.002% ≦ Ca ≦ 0.20%, One or two or more selected from 0.01% ≦ Te ≦ 0.20% and 0.03% ≦ Se ≦ 0.30% may be contained.

  The soft magnetic alloy preferably has a Vickers hardness Hv of 250 or more.

  The soft magnetic alloy according to the present invention has a high saturation magnetic flux density of 1.7 T or more by having the component composition in the region surrounded by the straight lines A to E. At the same time, a low coercive force of 1000 A / m or less can be obtained. Therefore, it becomes an excellent soft magnetic alloy having both high saturation magnetic flux density and low coercive force. Further, since it is not a component composition containing a large amount of expensive additive elements such as Co, it can be manufactured at low cost.

  Here, when the soft magnetic alloy has a component composition in a region surrounded by the straight lines A, C, D, E, F, and G, it is easy to achieve a further low coercive force.

  Further in this case, when the soft magnetic alloy has a component composition in a region surrounded by the straight lines D, E, G, H, and I, it becomes easier to achieve a low coercive force.

  Further, since the soft magnetic alloy contains the above amounts of Cr and Mo, in addition to low coercive force and high saturation magnetization, a soft magnetic alloy having high electrical resistance and high corrosion resistance can be obtained. .

  Further, when the soft magnetic alloy contains one or more selected from Pb, Bi, Ca, Te, and Se in the above amounts, the machinability of the soft magnetic alloy is advantageously improved. be able to.

  Further, when the soft magnetic alloy has a Vickers hardness Hv of 250 or more, the strength as a material can be compatible with excellent soft magnetic properties.

It is a graph which shows the relationship between content of Ni and content of Al, Si, and V about the soft magnetic alloy concerning embodiment of this invention.

  Below, the soft magnetic alloy concerning embodiment of this invention is demonstrated in detail.

[Outline of soft magnetic alloy]
The soft magnetic alloy according to the embodiment of the present invention contains the following elements, with the balance being Fe and inevitable impurities.
・ Ni
・ At least one selected from Al, Si, and V (hereinafter sometimes referred to as “Al etc.”)
Content of Ni, Al, etc. exists in the predetermined area | region demonstrated below.

  Moreover, the soft magnetic alloy according to the embodiment of the present invention may optionally contain at least one of Cr and Mo in addition to Ni and Al as the essential elements. Further, the soft magnetic alloy according to the embodiment of the present invention is arbitrarily selected from Pb, Bi, Ca, Te, Se in addition to Ni, Al, etc., and in addition to at least one of Cr and Mo. 1 type or 2 types or more may be contained. These preferable contents will also be described later.

  Inevitable impurities are allowed to be contained within a range that does not impair the magnetic and electrical characteristics of the soft magnetic alloy. Specific examples of unavoidable impurities include C ≦ 0.04%, Mn ≦ 0.3%, P ≦ 0.06%, S ≦ 0.06%, and N ≦ 0.06 in units of mass%. %, Cu ≦ 0.1%, Co ≦ 0.06%, and O ≦ 1%.

  The soft magnetic alloy according to the embodiment of the present invention can be manufactured by melting the above component metals and appropriately performing rolling, forging, or the like. Further, heat treatment such as magnetic annealing may be performed. Examples of the temperature during magnetic annealing include 800 to 1200 ° C.

[Component composition of the first region]
In the soft magnetic alloy according to the embodiment of the present invention, the content of Ni and the content of Al or the like have a predetermined relationship. Specifically, in a graph in which the content of Ni is [Ni], the content of Al, etc., that is, the total content of Al, Si, and V is [M], and the relationship between [Ni] and [M] is plotted. , [Ni] and [M] are within the predetermined first region. In the present specification, the content of each element including Ni and Al is expressed in terms of mass%. In addition, “middle” of each region includes a point and a vertex on a boundary line that divides each region.

  FIG. 1 is a graph showing the relationship between [Ni] and [M]. Here, the first region is defined as a pentagonal region surrounded by a straight line A, a straight line B, a straight line C, a straight line D, and a straight line E. In FIG. 1, each straight line is indicated by a symbol surrounded by “◯”.

Points 1 to 5 corresponding to the end points of each straight line are defined as follows. Here, when the content of Ni is a mass% and the content of Al or the like is b mass%, that is, the element content at a point where [Ni] = a, [M] = b is (a, b). In FIG. 1, each point is indicated by a number surrounded by “□”.
Point 1 (0.1, 0.01)
Point 2 (11.0, 0.01)
Point 3 (11.0, 7.00)
Point 4 (3.0, 10.00)
Point 5 (0.1, 7.00)

Each straight line is represented as a straight line connecting two points as follows.
Line A: Point 1 to Point 2 ([M] = 0.01)
Straight line B: point 2 to point 3 ([Ni] = 11.0)
Line C: Point 3 to Point 4
Line D: Point 4 to Point 5
Straight line E: point 5 to point 1 ([Ni] = 0.1)

  Here, the reason why each of the straight lines A to E is defined will be described.

Straight line A and straight line E ([M] = 0.01, [Ni] = 0.1)
In order to obtain a high saturation magnetic flux density while keeping the coercive force low, conditions [M] ≧ 0.01 and [Ni] ≧ 0.1 are defined.

  Specifically, by setting [Ni] ≧ 0.1, B30000, which is a magnetic flux density value measured at an external magnetic field H = 30000 A / m, can be set to 1.7 T or more (B30000 ≧ 1. 7T). Here, B30000 is a value that can approximate the saturation magnetic flux density in this kind of soft magnetic alloy. Even if the magnetic flux density does not reach saturation at H = 30000 A / m, the saturation magnetic flux density should be higher than B30000, and B30000 can be regarded as the lower limit value of the saturation magnetic flux density. In the soft magnetic alloy according to the embodiment of the present invention, the saturation magnetic flux density (B30000) is preferably 1.7 T or more, and more preferably 2.0 T or more.

  However, in an iron-base alloy containing only Ni as an additive element, when [Ni] ≧ 0.1, the crystal structure becomes an α phase + γ phase or a martensite phase, and the coercive force Hc exceeds 1000 A / m. It gets bigger. Therefore, by adding an element selected from Al, Si, and V and setting [M] ≧ 0.01, it is possible to promote the generation of the α phase and to secure a low coercive force of Hc ≦ 1000 A / m. it can. The α phase (ferrite phase) exhibits soft magnetism, whereas the γ phase (austenite phase) exhibits non-magnetic properties. When the martensite phase is included, the coercive force is increased. Al, Si, and V are elements that promote the formation of ferrite, and can improve the soft magnetic properties of the alloy.

・ Straight line B ([Ni] = 11.0)
As described above, by setting the Ni content to 0.1% or more, the saturation magnetic flux density can be increased. However, even if Ni is excessively contained, the saturation magnetic flux density is decreased. Therefore, by setting [Ni] ≦ 11.0, B30000 ≧ 1.7T can be secured. Moreover, the low coercive force of Hc ≦ 1000 A / m can be maintained.

・ Straight line C and straight line D
B30000 ≧ 1.7T can be secured by keeping the contents of Ni, Al, and the like below the values defined by the straight line C and the straight line D.

  As described above, the soft magnetic alloy according to the embodiment of the present invention has a high saturation magnetic flux density and a low coercive force and exhibits excellent soft magnetic properties, but at the same time has a high hardness. For example, the Vickers hardness Hv can be 150 or more, 250 or more, and further 350 or more. Such high hardness is presumed to be exhibited when Ni, Al, and the like are contained in the soft magnetic alloy.

[Component composition of the second region]
In the soft magnetic alloy according to the embodiment of the present invention, it is preferable that [Ni] and [M] are further in the second region in the first region.

  As shown in FIG. 1, the second region is defined as a hexagonal region surrounded by the following straight line F and straight line G in addition to the straight line A, straight line C, straight line D, and straight line E.

The straight line F is defined as a straight line connecting the points 6 and 7. here,
Point 6 (1.0, 0.01)
Point 7 (6.5, 3.50)
It is.

  The straight line G is defined as a straight line of [Ni] = 6.5. Here, the element content at the point p corresponding to the intersection of the straight line G and the straight line C is approximately p (6.5, 8.7).

  Here, the reason why the straight lines F and G are defined will be described.

・ Line F
By setting the content of Ni, Al, or the like to a value defined by the straight line F or more, the α phase can be easily maintained in the crystal structure. As a result, the coercive force Hc can be kept low. In particular, it becomes easy to suppress to a low level of Hc ≦ 500 A / m. For example, even if heat treatment is performed at 850 ° C., which is a general temperature for magnetic annealing of electromagnetic steel sheets, the α phase can be maintained at a high level. When the content of Ni and / or Al or the like is smaller than the value defined by the straight line F, an α phase + γ phase or a martensite phase is likely to be generated, and the coercive force Hc is increased. When this is performed, the soft magnetic properties are hardly expressed.

・ Line G ([Ni] = 6.5)
By setting [Ni] ≦ 6.5, it is particularly easy to ensure a high saturation magnetic flux density of B30000 ≧ 1.7T. When [Ni]> 6.5, even if Hc ≦ 500 A / m can be ensured, it may be difficult to achieve both B30000 ≧ 1.7T.

  Furthermore, the magnetic permeability can be increased by setting the contents of Ni, Al, and the like in the second region. For example, the relative permeability μ can be set to μ> 1000.

[Component composition of the third region]
In the soft magnetic alloy according to the embodiment of the present invention, it is preferable that [Ni] and [M] are further in the third region in the second region.

  As shown in FIG. 1, the third region is defined as a pentagonal region surrounded by the following straight line H and straight line I in addition to the straight line D, straight line E, and straight line G.

The straight line H is defined as a straight line connecting the point 8 and the point 7 described above. here,
Point 8 (0.1, 0.50)
Point 7 (6.5, 3.50)
It is.

The straight line I is defined as a straight line connecting the point 9 and the point 4 described above. here,
Point 9 (6.5, 7.00)
Point 4 (3.0, 10.00)
It is.

  When the content of Ni, Al, etc. is in the third region as described above, it is particularly excellent in the effect of suppressing the coercive force Hc by maintaining the α phase, and it becomes easy to satisfy Hc ≦ 500 A / m. For example, even if heat treatment is performed at a general temperature of 1100 ° C. as the temperature for magnetic annealing of permendur, the α phase can be maintained at a high level.

[Addition of Cr and Mo]
In the soft magnetic alloy according to the embodiment of the present invention, at least one selected from Ni, which is an essential additive element, and Al, Si, and V, is added to the first region (or the second region, the third region). Although it may contain only the quantity in this, it may contain at least one of Cr and Mo as an arbitrary element. By containing at least one of Cr and Mo, the electric resistance of the soft magnetic alloy can be increased. Moreover, corrosion resistance can be improved. The soft magnetic alloy may contain only one or both of Cr and Mo, but preferably contains at least Cr from the viewpoint of effectively enhancing the corrosion resistance.

  When Cr is contained, the Cr content is 1% ≦ Cr ≦ 14%. By setting the Cr content to 1% or more, a high value of ρ ≧ 70 μΩcm can be achieved as the electrical resistivity ρ. By increasing the electrical resistance, eddy current loss in the soft magnetic alloy can be reduced. Cr also has an effect of lowering the coercive force Hc, and it becomes easy to satisfy Hc ≦ 500 A / m by setting its content to 1% or more.

  However, if the Cr content is increased too much, the saturation magnetic flux density tends to decrease. By setting the Cr content to 14% or less, it is easy to ensure a high saturation magnetic flux density as in B30000 ≧ 1.7T. When Cr ≦ 9%, the high saturation magnetic flux density is more easily maintained. On the other hand, if Cr> 9%, Cr ≧ 10%, and more particularly Cr ≧ 12%, the effect of improving the electrical resistivity and corrosion resistance can be particularly high.

  On the other hand, when Mo is contained, the content of Mo is preferably 1% ≦ Mo ≦ 6%. By setting the Mo content to 1% or more, the effect of increasing electric resistance and corrosion resistance is excellent. Moreover, a high saturation magnetic flux density is securable by making Mo content 6% or less.

  As described above, at least Cr is preferably contained in the soft magnetic alloy, and when Mo is further contained, the contents of Cr and Mo are 1% ≦ Cr ≦ 14% and 1% ≦ Mo ≦, respectively. It is preferably in the range of 6%. Thus, the form containing both Cr and Mo can be regarded as a form in which a part of Cr is replaced with Mo and a combination of Cr and Mo is contained in the soft magnetic alloy. Mo is superior in effect to increase electrical resistance and corrosion resistance than Cr, and even if the addition amount is small, a high effect can be obtained. From this point of view, when a combination of Cr and Mo is employed, the same amount as that when only the above Cr is employed is added as the total value of the Cr content and the value of 3.3 times the Mo content. It is particularly preferred. That is, 1% ≦ Cr + 3.3Mo ≦ 14% may be satisfied from the viewpoint of increasing the electric resistance and the corrosion resistance while ensuring a high saturation magnetic flux density. From the viewpoint of maintaining a high saturation magnetic flux density at a higher level, Cr + 3.3Mo ≦ 9% is preferable. On the other hand, from the viewpoint of obtaining particularly high electrical resistivity and corrosion resistance, Cr + 3.3Mo> 9%, particularly Cr + 3.3Mo ≧ 10%, and Cr + 3.3Mo ≧ 12% may be satisfied. Keeping the Cr content small by using Mo together contributes to maintaining a large magnetic flux density value.

[Other additive elements]
The soft magnetic alloy according to the embodiment of the present invention includes the essential additive element Ni and at least one selected from Al, Si, and V, or these essential additive element and optional element Cr. In addition to at least one of Mo and Mo, one or more elements selected from the following group may be further contained as optional elements.
・ 0.03% ≦ Pb ≦ 0.30%
・ 0.002% ≦ Bi ≦ 0.020%
・ 0.002% ≦ Ca ≦ 0.20%
・ 0.01% ≦ Te ≦ 0.20%
・ 0.03% ≦ Se ≦ 0.30%

  By containing one or more additive elements selected from the above, the machinability of the soft magnetic alloy can be improved. The lower limit value of the content of each element is defined as the content at which the effect of improving machinability is obtained. On the other hand, the upper limit value of the content of each element is defined as a content that can avoid a decrease in magnetic properties.

  Hereinafter, the present invention will be described more specifically with reference to examples.

  As Examples A1 to A12, B1 to B18, and Comparative Examples 1 to 9, soft magnetic alloys having the component compositions (unit: mass%) shown in Table 1 and Table 2 were prepared. In addition, the additive elements shown in Table 3 were further added to some of the soft magnetic alloys in Example B group of Table 2 to produce soft magnetic alloys according to Example B 'group. In any component composition, the balance is Fe and inevitable impurities. As a specific manufacturing method, metal materials having respective composition ratios were melted in a vacuum induction furnace, and were cast and hot forged. And it processed into the shape of the measurement test piece used for each following test, and performed the magnetic annealing at 850 degreeC.

  Using the measurement test pieces thus obtained, measurements of magnetic flux density B30000, coercive force Hc, electrical resistivity ρ, hardness, and corrosion resistance were evaluated. Further, in some examples, machinability was also evaluated. Below, the method of each test is demonstrated.

<Measurement of magnetic flux density>
Each soft magnetic alloy was processed into a cylindrical shape having an outer diameter of φ28 mm, an inner diameter of φ20 mm, and a thickness of t3 mm to obtain a magnetic ring (iron core). Using this magnetic ring, a primary coil (480 turns) and a secondary coil (20 turns) were formed and used as a measurement sample. Then, the magnetic flux density was measured using a magnetic measuring device (“BH-1000” manufactured by Electronic Magnetic Industry). The magnetic flux density was measured by flowing a current through the primary coil to generate a magnetic field H in the magnetic ring, and calculating the magnetic flux density generated in the magnetic ring based on the integrated value of the voltage induced in the secondary coil. . In the measurement, the magnetic field H was set to 30000 A / m, and B30000, which was the magnetic flux density at that time, was recorded.

<Measurement of coercive force>
The magnetization curve (BH curve) was measured using the same measurement sample and magnetic measurement apparatus used for the measurement of the magnetic flux density. And the coercive force Hc was estimated based on the obtained hysteresis loop.

<Measurement of electrical resistivity>
Each soft magnetic alloy was processed into a prismatic shape with a cross section of 10 mm square and a length of 30 mm, and the electrical resistivity was measured. The measurement was performed by the four probe method.

<Evaluation of corrosion resistance>
Corrosion resistance of each soft magnetic alloy was evaluated by a salt spray test specified in JIS Z 2371. That is, 24 hours after spraying with salt water, the surface of the sample was visually observed, and the ratio of the area of the region where the occurrence of rust was confirmed was estimated as the rust generation rate. The smaller the value of the rust occurrence rate, the higher the corrosion resistance.

<Measurement of hardness>
Each soft magnetic alloy was processed into 1 cm square, embedded in resin and polished. The Vickers hardness (Hv) was measured for this test piece using a Vickers hardness tester.

<Evaluation of machinability>
A machinability test was performed on a part of Example B group and the soft magnetic alloys according to Example B ′ group to evaluate machinability. That is, a hole was made to penetrate through a plate-like sample having a thickness of 5 mm using a drill having a diameter of 2 mm. The machinability of each sample was evaluated by counting the number of through holes formed until penetration was impossible. When it can penetrate 81 or more holes, cutting performance is particularly excellent, “◎”, when it can penetrate 51 holes or more, 80 holes or less, good cutting performance “○”, only through less than 51 holes The case where it was not possible was evaluated as poor machinability “x”. The cutting speed was 20 m / min.

<Result>
Table 1 shows the component compositions and the results of the above tests for the soft magnetic alloys according to Examples A1 to A12 and Comparative Examples 1 to 9. About content, such as Ni and Al, Example A1-A10 respond | corresponds to the point 1-point 10 shown by the number enclosed in "(square) in FIG. 1, and Comparative Examples 2-9 are (). Corresponds to each point indicated by a number surrounded by. Comparative Example 1 is pure iron.

  According to Table 1, in each Example in which the contents of Ni, Al, and the like are in the first region, the magnetic flux density B30000 is 1.7 T or more, and the coercive force Hc is 1000 A / m or less. Yes. That is, by adding Ni and at least one selected from Al, Si, and V to the Fe in the content in the first region, the coercive force is low and the saturation magnetic flux density is high. It has been shown that a soft magnetic alloy can be obtained. Furthermore, when Example A10 which differs only in the presence or absence of addition of Cr and Mo and Examples A11 and A12 are compared, by adding Cr or Mo like Example A11 and A12, high magnetic flux density and low High electrical resistance and high corrosion resistance can be obtained while maintaining the coercive force.

  On the other hand, in Comparative Example 1 using pure iron, although high magnetic flux density and low coercive force are achieved, the corrosion resistance is poor and the electrical resistivity ρ is also low. In Comparative Example 2 in which Al, Si, and V are not contained and a large amount of Ni is contained, although the magnetic flux density B30000 shows a high value, the coercive force Hc exceeds 1000 and is soft. Inferior to magnetic properties. In Comparative Example 3, although Al is contained, the coercive force Hc is still large because the content is too small. Also in Comparative Examples 4, 8, and 9, the coercive force Hc is increased due to the excessive Ni content. Comparative Examples 4, 8, and 9 contain Al, Si, and V as additive elements other than Ni, respectively, but the contents of Ni and these elements are similar, The coercive force Hc is a large value exceeding 2000 A / m. In Comparative Examples 5 and 6, it corresponds to being located in a region where the contents of Ni and Al are higher than those of the straight line C and straight line D defining the first region, and the magnetic flux density is less than 1.7T. It is getting smaller. Also in the comparative example 7, since Ni is not contained, the magnetic flux density is B30000 less than 1.7T.

  Table 2 shows the composition of the soft magnetic alloy and the results of the above tests for Examples B1 to B18 including the case where the contents of Cr and Mo are further increased.

  According to Table 2, it can be seen that, as in Examples B1 to B17, by increasing the content of Cr (or Cr + 3.3Mo) beyond 9%, particularly high electrical resistivity and corrosion resistance are achieved. . In particular, when Example B1 and Example B3 having the same Ni and Al or V contents and different Cr contents are compared, in Example B3 having a high Cr content, the electrical resistivity and corrosion resistance are improved. I understand that A decrease in coercive force has also been observed. Also in the comparison between Examples B10 and B11 in which the contents of Ni, Al, and Mo are substantially the same, Example B10 having a higher Cr content has higher electrical resistivity and corrosion resistance.

  Moreover, when Example B1 and Example B5 which differ only in the presence or absence of addition of Mo are compared, it turns out that an electrical resistivity and a corrosion-resistant increase are achieved by adding Mo in addition to Cr. In comparison between Example B17 and Example B18, which have the same Ni and Al contents and both do not contain Cr, lowering of electrical resistivity and corrosion resistance is achieved in Example B17 having a higher Mo content. ing. Further, in Examples B12 and B13, the Ni content is the same and the Al content is almost the same, but B13 having a larger value of Cr + 3.3Mo has a higher electrical resistivity. Further, when Examples B15 to 18 having the same Ni and Al contents were compared, in Examples B15 to B17 in which the value of Cr + 3.3Mo was larger than Example B18, it was higher than that of Example B18. Corrosion resistance is obtained.

  In Examples B10 to B18, the hardness is lower than in Examples B1 to B9, but this is because the content ratio of Al / Ni in Examples B10 to B18 is 1 or more. Therefore, it is assumed that the contribution of the ferrite structure is increased. However, in Examples B10 to B18, by keeping the Cr content relatively low or not containing Cr, the value of the magnetic flux density can be kept large even if the Ni content is low. And even if there is little content of Cr, the electric resistivity and corrosion resistance are kept high by maintaining the value of Cr + 3.3Mo largely with Mo.

  Further, among the components shown in Table 2, one or more additional elements selected from Pb, Bi, Ca, Te, and Se are added to the component compositions of Examples B1, B2, B5, B6, B8, and B11. Soft magnetic alloys according to the contained Examples B1 ′, B2 ′, B5 ′, B6 ′, B8 ′, and B11 ′ were prepared, and the relationship between the presence of these added elements and the machinability was evaluated. Table 3 shows the evaluation results of the component composition and machinability. Although not shown, the magnetic flux density, coercive force, and electric power equivalent to the values in Table 2 obtained for the corresponding examples of the group B in each of the examples of the group B ′ to which these additive elements were added. It has been confirmed that resistivity, corrosion resistance and hardness can be obtained.

  Looking at Table 3, even in Examples of Group B not containing one or more selected from Pb, Bi, Ca, Te, Se, high machinability is obtained to some extent, but their addition It can be seen that the machinability is particularly improved in the examples of the group B ′ containing the element. That is, it is confirmed that Pb, Bi, Ca, Te, Se has an effect of improving the machinability of the soft magnetic alloy.

  Heretofore, the embodiments and examples of the present invention have been described. The present invention is not particularly limited to these embodiments and examples, and various modifications can be made.

Claims (8)

Ni and
And at least one selected from Al, Si, and V,
The balance consists of Fe and inevitable impurities,
In a graph in which the relationship between [Ni] and [M] is plotted with the content of Ni being [Ni], the total content of Al, Si, and V being [M], the following straight line A, A soft magnetic alloy, wherein [Ni] and [M] exist in a region surrounded by a straight line B, a straight line C, a straight line D, and a straight line E.
Straight line A: [M] = 0.01
Straight line B: [Ni] = 11.0
Straight line C: [Ni] = 11.0, [M] = 7.00 and a straight line connecting [Ni] = 3.0, [M] = 10.00 points Straight line D: [Ni] = 3.0, [M] = 10.00 A straight line connecting the points [Ni] = 0.1 and [M] = 7.00 Straight line E: [Ni] = 0.1 In the graph, the [Ni] and [M] exist in a region surrounded by the straight line A, straight line C, straight line D, straight line E and the following straight line F, straight line G. 2. The soft magnetic alloy according to 1.
Straight line F: [Ni] = 1.0, [M] = 0.01 and a straight line connecting [Ni] = 6.5, [M] = 3.50 A straight line G: [Ni] = 6.5 3. The [Ni] and [M] are present in a region surrounded by the straight line D, the straight line E, the straight line G, and the following straight line H, straight line I in the graph. Soft magnetic alloy.
Straight line H: A straight line connecting a point of [Ni] = 0.1, [M] = 0.50 and a point of [Ni] = 6.5, [M] = 3.50 Straight line I: [Ni] = 6.5, a straight line connecting the point [M] = 7.00 and the point [Ni] = 3.0, [M] = 10.00   The soft magnetic alloy according to claim 1, further comprising 1% ≦ Cr ≦ 14% by mass%.   5. The soft magnetic alloy according to claim 1, further comprising 1% ≦ Mo ≦ 6% by mass%.   The soft magnetic alloy according to any one of claims 1 to 5, wherein the soft magnetic alloy contains Cr and Mo and is 1%? Cr + 3.3Mo? 14% by mass.   Further, in terms of mass%, 0.03% ≦ Pb ≦ 0.30%, 0.002% ≦ Bi ≦ 0.020%, 0.002% ≦ Ca ≦ 0.20%, 0.01% ≦ Te ≦ 0 The soft magnetic alloy according to any one of claims 1 to 6, characterized by containing one or more selected from .20%, 0.03% ≤ Se ≤ 0.30%.   The soft magnetic alloy according to any one of claims 1 to 7, wherein the Vickers hardness Hv is 250 or more.

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