JPH08321415A - Permanent magnet, its manufacture and medical instrument - Google Patents

Abstract

PURPOSE: To obtain a permanent magnet whose maximum energy product is high, relating to a permanent magnet and its manufacturing method, a medical instrument and an electromagnetic part, etc., using it. CONSTITUTION: A permanent magnet consisting of, in atom-ratio, 0.001-30% in total of one or multiple kinds out of 33-47% of Pt, below 20% of Co, below 10% of Ni, Cu, Mn, Ag, Zr, Hf and Si, respectively, and below 7% of In, Sn, Sb, Ru, Os, Re, rare earth elements, B, C and N, respectively, and in addition, Fe and a little amount of impurities, and has a maximum energy product of more than 2 megagauss oersteds.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to Fe (iron) and Pt.
(Platinum), Co (cobalt), Ni (nickel), C
u (copper), Mn (manganese), Ag (silver), Zr (zirconium), Hf (hafnium), Si (silicon),
In (indium), Sn (tin), Sb (antimony), Ru (ruthenium), Os (osnium), Re
(Rhenium), rare earth element, B (boron), C (carbon),
Permanent magnet consisting of one or more of N (nitrogen) or a main component of this is V (vanadium), Nb (niobium), Ta (tantalum), Cr (chromium), Mo (molybdenum), W (tungsten), Al
(Aluminum), Ti (titanium), Ge (germanium), Ga (gallium), Au (gold), Pd (palladium), Rh (rhodium), Ir (iridium), one or more permanent magnets, and The present invention relates to a manufacturing method thereof, a medical device and an electromagnetic component using the same, and an object thereof is to obtain a permanent magnet having a large maximum energy product.

[0002]

2. Description of the Related Art In a Fe-Pt binary alloy, Fe
Since the Pt50 atomic% alloy has a high transformation temperature of about 1320 ° C. from the γ ₁ phase of the ordered lattice to the γ phase of the disordered lattice, the overaging that has already been ordered even by rapid quenching by water quenching. In this state, a permanent magnet with a large maximum energy product cannot be obtained. Therefore, the composition of the Fe-Pt alloy is F
By moving to the e side, the transformation temperature is lowered to about 800 ° C., and the γ phase of the disordered lattice can be obtained relatively easily.
A permanent magnet with a large maximum energy product can be obtained by making the γ ₁ phase homogeneously and finely dispersed in the initial state of ordering by transforming this into the γ ₁ phase of an ordered lattice or the matrix of the γ matrix. There is. (Japanese Patent Publication No. 3-35801).

[0003]

The Fe-Pt type alloy is
Since the transformation temperature from the regular lattice γ ₁ phase to the disordered lattice γ phase is high, in order to obtain a permanent magnet with a large maximum energy product, first, the homogeneous lattice-solidified regular lattice γ ₁ phase is formed. A heat treatment from a high temperature above the temperature to an ultra-quench is required. Therefore, it is industrially difficult to mass-produce a permanent magnet having a large maximum energy product with good reproducibility, and it is strongly desired to improve the permanent magnet. Also Fe
Since the -Pt-based alloy has poor fluidity of the molten metal during melting and a sound ingot cannot be easily obtained, improvement of these is strongly demanded.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to further improve the magnet characteristics of Fe-Pt alloys and improve the reproducibility of the magnet characteristics. That is, in the present invention, the atomic ratio of Pt is 33 to 47% and Co is 20% or less.
i, Cu, Mn, Ag, Zr, Hf, Si 1 each
0% or less, 7% or less of each of In, Sn, Sb, Ru, Os, Re, rare earth elements, B, C and N, or 2
Alloy consisting of 0.001 to 30% of the above species and the balance Fe, or if necessary, V,
0.001 to 2 of 1% or more of Nb, Ta, Cr, Mo, W, Al, and Ti of 10% or less and Ge, Ga, Au, Pd, Rh, and Ir of 7% or less, respectively.
An alloy added with 0% is used as a molten metal in a vacuum or in various gas atmospheres such as argon, methane, hydrogen and nitrogen by an appropriate melting method such as a high frequency induction melting method, a Tanman furnace method, an arc furnace method and the like. None, by casting in a suitable mold, such as a mold or a mold made of refractory, a molten ingot having good fluidity during casting can be obtained.

This is higher than the transformation temperature, preferably about 800
Homogeneous solution treatment by heating at a temperature of ℃ or more and melting point for a suitable time, for example, 1 minute or more, preferably 5 minutes or more and 100 hours or less, and then cooling at an appropriate rate, preferably 100 ° C / hour or more Give. Immediately if necessary, or if necessary, a suitable processing rate, preferably 30
% Of the permanent magnet having a large maximum energy product by heating and cooling at a temperature not higher than the transformation temperature, preferably 400 to 800 ° C. for a suitable time, preferably 1 minute to 1000 hours. Is obtained.

Since these permanent magnets have excellent magnet characteristics and good fluidity, processability and corrosion resistance of molten metal, they are commonly used in medical devices, that is, MRI, cow mug, electrocardiograph actuator, hollow organ connecting device. Etc., and is also suitable for dental medical tools, that is, denture fixing tools (including denture fixing magnetic attachments), artificial roots, crowns, bridges, dental maintenance devices, orthodontic jigs and devices for dentition, etc. In addition, by positively utilizing the excellent casting fluidity and corrosion resistance of the alloy of the present invention, cast dental crowns directly cast, cast bridges, cast straightening jigs, etc. It is also suitable for tools such as bracelets, necklaces, piercings, arm bands, and attached magnets. In particular, since it has strong magnet characteristics, it is also suitable for electromagnetic parts and devices utilizing conversion of electrical and mechanical energy.

The features of the present invention are as follows. [First Invention] Pt 33 to 47% and Co 20% in atomic ratio
10% or less of each of Ni, Cu, Mn, Ag, Zr, Hf, Si, In, Sn, Sb, Ru, Os, R
e, rare earth elements, B, C, N, each of 7% or less in total of 1 or 2 or more 0.001 to 30% in total and the balance F
A permanent magnet comprising e and a small amount of impurities and having a maximum energy product of 2 megagauss-Oersted or more.

[Second invention] In terms of atomic ratio, P is the main component.
t33 to 47% and Co 20% or less, Ni, Cu, Mn,
10% or less of each of Ag, Zr, Hf, and Si, In,
Sn, Sb, Ru, Os, Re, rare earth element, B, C,
N of 7% or less, respectively, or a total of 0.
001 to 30% and V, Nb, Ta, C as auxiliary components
10% or less of each of r, Mo, W, Al and Ti, G
e, Ga, Au, Pd, Rh, Ir, each of which is 7% or less and a total of 0.001 to 20% of one or more, and the balance Fe and a small amount of impurities, and the maximum energy product is 2 mega Gauss-Oersted. A permanent magnet having the above.

[Third invention] Pt 33 to 47% in atomic ratio
And Co 20% or less, Ni, Cu, Mn, Ag, Zr, H
10% or less of f and Si, In, Sn, Sb, R
u, Os, Re, each of rare earth elements, B, C, N 7
% Or less 1 type or a total of 2 or more types 0.001 to 30%
And an alloy consisting of the balance Fe and a small amount of impurities,
A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more characterized by heating at a temperature of 0 ° C. or higher and a melting point or lower for 1 minute or more, followed by homogeneous solution treatment, and then cooling at a rate of 100 ° C./hour or higher. .

[Fourth Invention] Pt 33 to 47% in atomic ratio
And Co 20% or less, Ni, Cu, Mn, Ag, Zr, H
10% or less of f and Si, In, Sn, Sb, R
u, Os, Re, each of rare earth elements, B, C, N 7
% Or less 1 type or a total of 2 or more types 0.001 to 30%
And an alloy consisting of the balance Fe and a small amount of impurities,
It is heated at a temperature of 0 ° C or higher and a melting point or lower for 1 minute or more, subjected to a homogeneous solution treatment, cooled at a rate of 100 ° C / hour or higher, and then heated at a temperature of 400 ° C to 800 ° C for 1 minute or longer and 1000 hours or less, and then cooled. A method of manufacturing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[Fifth Invention] Pt 33 to 47% in atomic ratio
And Co 20% or less, Ni, Cu, Mn, Ag, Zr, H
10% or less of f and Si, In, Sn, Sb, R
u, Os, Re, each of rare earth elements, B, C, N 7
% Or less 1 type or a total of 2 or more types 0.001 to 30%
And an alloy consisting of the balance Fe and a small amount of impurities,
After heating for 1 minute or more at a temperature of 0 ° C or higher and a melting point or lower, a homogeneous solution treatment is performed, followed by cooling at a rate of 100 ° C / or higher, and then cold working at a working rate of 30% or higher, which is further
A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, which comprises heating at a temperature of 00 to 800 ° C. for 1 minute or more and 1000 hours or less and then cooling.

[Sixth Invention] In terms of atomic ratio, P is the main component.
t33 to 47% and Co 20% or less, Ni, Cu, Mn,
10% or less of each of Ag, Zr, Hf, and Si, In,
Sn, Sb, Ru, Os, Re, rare earth element, B, C,
N of 7% or less, respectively, or a total of 0.
001 to 30% and V, Nb, Ta, C as auxiliary components
10% or less of each of r, Mo, W, Al and Ti, G
e, Ga, Au, Pd, Rh, Ir, each of which is 7% or less, and a total of 0.001 to 20% of one kind or two or more kinds, and the balance Fe and an alloy containing a small amount of impurities. A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, which comprises heating at a temperature of 1 minute or more, performing a homogeneous solution treatment, and then cooling at a rate of 100 ° C./hour or more.

[Seventh invention] In the atomic ratio, P is the main component.
t33 to 47% and Co 20% or less, Ni, Cu, Mn,
10% or less of each of Ag, Zr, Hf, and Si, In,
Sn, Sb, Ru, Os, Re, rare earth element, B, C,
N of 7% or less, respectively, or a total of 0.
001 to 30% and V, Nb, Ta, C as auxiliary components
10% or less of each of r, Mo, W, Al and Ti, G
e, Ga, Au, Pd, Rh, Ir, each of which is 7% or less, and a total of 0.001 to 20% of one kind or two or more kinds, and the balance Fe and an alloy containing a small amount of impurities. After heating at a temperature for 1 minute or more, a homogeneous solution treatment is performed, followed by cooling at a rate of 100 ° C./hour or more, and then 4
A method for producing a permanent magnet having a maximum energy energy product of 2 megagauss-Oersted or more, characterized by heating at a temperature of 00 ° C to 800 ° C for 1 minute or more and 1000 hours or less and then cooling.

[Eighth Invention] P as a main component in atomic ratio
t33 to 47% and Co 20% or less, Ni, Cu, Mn,
10% or less of each of Ag, Zr, Hf, and Si, In,
Sn, Sb, Ru, Os, Re, rare earth element, B, C,
N of 7% or less, respectively, or a total of 0.
001 to 30% and V, Nb, Ta, C as auxiliary components
10% or less of each of r, Mo, W, Al and Ti, G
e, Ga, Au, Pd, Rh, Ir, each of which is 7% or less, and a total of 0.001 to 20% of one kind or two or more kinds, and the balance Fe and an alloy containing a small amount of impurities. After heating for 1 minute or more at a temperature to perform a homogeneous solution treatment, the solution is cooled at a rate of 100 ° C./hour or more, and then cold-worked at a working rate of 30% or more.
A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, which comprises heating at a temperature of 800 ° C. for 1 minute or more and 1000 hours or less and then cooling.

[Ninth invention] Pt 33-47% in atomic ratio
And Co 20% or less, Ni, Cu, Mn, Ag, Zr, H
10% or less of f and Si, In, Sn, Sb, R
u, Os, Re, each of rare earth elements, B, C, N 7
% Or less 1 type or a total of 2 or more types 0.001 to 30%
And a balance of Fe and a small amount of impurities, and a medical device comprising a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[10th invention] The atomic ratio of Pt is 33 to 47% as main components and Co is 20% or less.
n, Ag, Zr, Hf, Si each 10% or less, I
n, Sn, Sb, Ru, Os, Re, rare earth element, B,
Each of C and N is 7% or less, and one or more of them is added in a total amount of 0.001 to 30% and V, Nb, and T as accessory components.
Each of a, Cr, Mo, W, Al, and Ti is 10% or less, and each of Ge, Ga, Au, Pd, Rh, and Ir is 7%.
% Or less total of 1 or 2 or more 0.001 to 20%
And a balance of Fe and a small amount of impurities, and a medical device comprising a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[Eleventh Invention] Pt 33 to 47 in atomic ratio
% And Co 20% or less, Ni, Cu, Mn, Ag, Zr,
10% or less of Hf and Si, In, Sn, Sb,
Ru, Os, Re, rare earth elements, B, C, N, each of 7% or less in total, or a total of 0.001 to 30 of 1 or 2 or more
% And the balance Fe and a small amount of impurities, and a health care device comprising a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[Twelfth Invention] Atomic ratios of Pt 33 to 47% and Co 20% or less as main components, Ni, Cu, M
n, Ag, Zr, Hf, Si each 10% or less, I
n, Sn, Sb, Ru, Os, Re, rare earth element, B,
Each of C and N is 7% or less, and one or more of them is added in a total amount of 0.001 to 30% and V, Nb, and T as accessory components.
Each of a, Cr, Mo, W, Al, and Ti is 10% or less, and each of Ge, Ga, Au, Pd, Rh, and Ir is 7%.
% Or less total of 1 or 2 or more 0.001 to 20%
And a balance of Fe and a small amount of impurities, and a health and medical device comprising a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[13th invention] Pt 33 to 47 in atomic ratio
% And Co 20% or less, Ni, Cu, Mn, Ag, Zr,
10% or less of Hf and Si, In, Sn, Sb,
Ru, Os, Re, rare earth elements, B, C, N, each of 7% or less in total, or a total of 0.001 to 30 of 1 or 2 or more
% And the balance Fe and a small amount of impurities, and a dental medical device comprising a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[Fourteenth invention] In atomic ratio, 33 to 47% of Pt as a main component and 20% or less of Co, Ni, Cu, M
n, Ag, Zr, Hf, Si each 10% or less, I
n, Sn, Sb, Ru, Os, Re, rare earth element, B,
Each of C and N is 7% or less, and one or more of them is added in a total amount of 0.001 to 30% and V, Nb, and T as accessory components.
Each of a, Cr, Mo, W, Al, and Ti is 10% or less, and each of Ge, Ga, Au, Pd, Rh, and Ir is 7%.
% Or less total of 1 or 2 or more 0.001 to 20%
A dental medical device comprising a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, and a balance Fe and a small amount of impurities.

[15th invention] Pt 33-47 in atomic ratio
% And Co 20% or less, Ni, Cu, Mn, Ag, Zr,
10% or less of Hf and Si, In, Sn, Sb,
Ru, Os, Re, rare earth elements, B, C, N, each of 7% or less in total, or a total of 0.001 to 30 of 1 or 2 or more
% And the balance Fe and a small amount of impurities, and cast crowns and bridges having a maximum energy product of 2 megagauss-Oersted or higher.

[Sixteenth invention] Atomic ratios of 33 to 47% Pt as main components and 20% or less Co, Ni, Cu, M
n, Ag, Zr, Hf, Si each 10% or less, I
n, Sn, Sb, Ru, Os, Re, rare earth element, B,
Each of C and N is 7% or less, and one or more of them is added in a total amount of 0.001 to 30% and V, Nb, and T as accessory components.
Each of a, Cr, Mo, W, Al, and Ti is 10% or less, and each of Ge, Ga, Au, Pd, Rh, and Ir is 7%.
% Or less total of 1 or 2 or more 0.001 to 20%
And cast crowns and bridges with a balance of Fe and a small amount of impurities and having a maximum energy product of at least 2 megagauss-Oersted.

[Seventeenth invention] Pt 33 to 47 in atomic ratio
% And Co 20% or less, Ni, Cu, Mn, Ag, Zr,
10% or less of Hf and Si, In, Sn, Sb,
Ru, Os, Re, rare earth elements, B, C, N, each of 7% or less in total, or a total of 0.001 to 30 of 1 or 2 or more
% And the balance Fe and a small amount of impurities, and an electromagnetic component and equipment composed of a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

[Eighteenth invention] Atomic ratios of Pt 33 to 47% and Co 20% or less as main components, Ni, Cu, M
n, Ag, Zr, Hf, Si each 10% or less, I
n, Sn, Sb, Ru, Os, Re, rare earth element, B,
Each of C and N is 7% or less, and one or more of them is added in a total amount of 0.001 to 30% and V, Nb, and T as accessory components.
Each of a, Cr, Mo, W, Al, and Ti is 10% or less, and each of Ge, Ga, Au, Pd, Rh, and Ir is 7%.
% Or less total of 1 or 2 or more 0.001 to 20%
Also, an electromagnetic component and a device which consist of a balance Fe and a small amount of impurities, and consist of a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more.

Next, the reason why the composition of the alloy of the present invention is limited to the above range is that the maximum energy product is 2 megagauss-Oersted or more in this composition range and the magnet characteristics are excellent, but this composition range is set. This is because the magnet characteristics will deteriorate if they are removed. The alloy of the present invention has an equivalent atomic ratio of FeP.
The composition of the t alloy was moved to the Fe side, that is, to the side with a small amount of Pt to improve the magnet characteristics.
If it exceeds 7%, the atomic ratio of Fe and Pt becomes close to 50:50, and it becomes difficult to form the γ phase of the disordered lattice by the homogeneous solution treatment, so that the magnet characteristics deteriorate, while Pt is 3 or less.
If it is less than 3%, the magnetic properties will be lost.
.About.47%, desirably less than 35 to 40%. Generally, in addition to this, Co 20% or less, Ni, Cu, Mn,
10% or less of Ag, Zr, Hf, Si, In, S
n, Sb, Ru, Os, Re, rare earth element, B, C, N
7% or less of any of the above, and Cr, Mo, W, V, and
10% or less of Nb, Ta, Al, or Ti, Au, G
Addition of 7% or less of any one of a, Ge, Pd, Rh, and Ir has the effect of particularly increasing the coercive force.
0% or less, any 10% or less of Ni, Cu, Si, I
n, Sn, Sb, Ru, Os, Re, rare earth element, B,
Either 7% or less of C or N, and V, Cr, or Ti as accessory components
10% or less and any of Ge, Ga, Pd, Rh, and Ir of 7% or less are added, the squareness of the magnetic hysteresis curve is particularly improved and the residual magnetic flux density is increased, resulting in the maximum energy product. A permanent magnet having a magnetic field density of 2 megagauss oersted or more is obtained. Furthermore, Mn, S
The addition of i, Al, Ga, In, and Ge is particularly effective in increasing the fluidity of the molten metal and obtaining a sound ingot.
The addition of h, Ru, Os, Re, Ir, Au, and Pd has a great effect to improve the corrosion resistance.

Next, the reasons for limiting the conditions for the homogeneous solution treatment in the present invention will be described. First, the homogeneous solution treatment temperature will be described. The order-disorder transformation point of the alloy having the composition of the present invention varies depending on the composition, but 800 to 1300.
° C. and is, also the melting point gamma ₁ of this for homogenization solution treatment temperature is not 800 ° C. or more, the superlattice is about 1550 ° C.
Since the phases are mixed, and as a result, the γ single phase of the disordered lattice cannot be obtained, the temperature is limited to 800 ° C. or higher and the melting point or lower. Also, the composition is not sufficiently homogeneous if the homogeneous solution treatment time is less than 1 minute, so it was limited to 1 minute or more. The faster the cooling rate after the homogeneous solution treatment is, the better, but if it is less than 100 ° C./hour, the crystal of γ ₁ phase of the regular lattice finely dispersed and precipitated grows, and the crystal of large γ ₁ phase becomes coarse, and the magnet characteristics are improved. The cooling rate is limited to 100 ° C./hour or more, because increasing the temperature hinders it.

Next, the reasons for limiting the tempering process conditions of reheating after rapid cooling will be described. If the tempering temperature is lower than 400 ° C., the tempering time will be 1000 hours or more, which is not economically preferable, and improvement in magnet characteristics cannot be expected. On the other hand, if the temperature exceeds 800 ° C, the regularization progresses rapidly and the magnet characteristics tend to deteriorate, so the tempering temperature is 400
Limited to ~ 800 ° C. The preferred range is 500 to 750.
° C. If the tempering time is less than 1 minute, 800
Even at a tempering temperature of ℃, the tempering treatment does not improve the magnet characteristics, while if it exceeds 1000 hours, the regularization progresses rapidly and the magnet characteristics deteriorate, so the tempering treatment time is from 1 minute to 100 minutes.
Limited to 0 hours.

Next, when cold working such as wire drawing or rolling of 30% or more is carried out prior to the tempering process and the cold working is less than 30%, the internal strain generated by the cold working is generated. The cold working rate is 3 because it does not improve the characteristics.
Limited to 0% or more. Cooling after tempering may be rapid cooling or slow cooling, but it is desirable to cool quickly.

[0029]

In the present invention, the γ ₁ single phase which is incomplete due to composition and heat treatment means a perfect ordered lattice in the case of Fe: Pt = 50: 50 in atomic ratio in Fe-Pt binary alloy. However, in the present invention, the γ ₁ phase is made into an incomplete ordered lattice by moving the composition to the Fe side, and by quenching or reheating after quenching, the γ ₁ phase is transformed into an ordered lattice γ ₁ The initial state of transformation into a phase is obtained, which is an incomplete γ ₁ phase. The structure of the alloy magnet produced from the alloy having the composition of the present invention according to the production method described below has a structure of face-centered tetragonal type and is incomplete due to heat treatment γ ₁ single phase or γ _1
One phase is a finely dispersed and homogeneously dispersed two-phase coexisting state in the mother phase of the face-centered cubic γ phase. However, in any of the structures, it is not less than 2 megagauss-Oersted as expected in the present invention. The maximum energy product is satisfied.

Next, the present invention will be described in detail in the order of steps. (1) In order to produce the alloy of the present invention, the metal weighed to the desired composition is melted in an appropriate melting furnace and then sufficiently stirred to produce a compositionally homogeneous molten alloy, which is prepared in a suitable shape. It is placed in a mold, formed into an ingot, or forged, drawn, and rolled into a predetermined shape, heated to a temperature of 800 ° C or higher and a melting point or lower for 1 minute or more, and then subjected to a homogeneous solution treatment at 100 ° C /
Rapidly cool at a cooling rate higher than the hour. In this process, the initial state of transformation from the face-centered cubic γ phase to the face-centered tetragonal γ ₁ phase by quenching, or the γ ₁ disordered lattice phase in the γ ₁ ordered lattice phase This is a process of obtaining a state in which the fine crystals of (1) are homogeneously dispersed and fixing at room temperature.

(2) 400-800 ° C. after rapid cooling in (1)
At least 1 at a temperature of (preferably 500 to 750 ° C.)
When reheated for more than a minute (preferably 5 minutes to 1000 hours), local strain occurs in the initial state where the irregular γ-phase solid solution generated at high temperature transforms into the ordered lattice γ ₁ phase, and the domain wall movement is prevented. As a result, a permanent magnet having an extremely high coercive force and an extremely large maximum energy product can be obtained.

(3) After the rapid cooling of (1), the processing rate is 30%
Cold working such as wire drawing or rolling is performed. (4) After the cold working of (3), the tempering treatment of (2) is added. In this step, the internal strain generated in the step (3) produces an appropriate local strain and a crystalline texture upon the change of the γ ₁ phase, and as a result, it promotes the improvement of the squareness in the magnetic hysteresis curve and is excellent. Permanent magnet characteristics are obtained.

[0033]

EXAMPLES Next, examples of the present invention will be described. Example 1 Alloy No. 42 (composition Pt = 38%, Cu = 2
%, B = 1%, Fe = remainder) as a raw material 99.9% pure electrolytic iron, platinum and copper and 9
Boron with a purity of 9,8% was used. A raw material having a total weight of 50 g was put into an alumina crucible, melted in a high-frequency induction melting furnace in a vacuum, and well stirred to obtain a homogeneous molten alloy. Then, this was poured into a mold having a hole with a diameter of 5 mm, a length of 30 mm was cut from the obtained round bar, heat treatment and cold working as shown in Table 1 were performed, and the magnet characteristics were measured.

[0034]

[Table 1]

Further, FIG. 1 shows the coercive force Hc, the residual magnetic flux density Br and the maximum energy product (BH) when heat-treated at 1350 ° C. for 30 minutes, cooled at a rate of 150 ° C./sec and then heated at each temperature for 5 hours. ) Max and the tempering temperature. In the state where it is rapidly cooled and subjected to homogeneous solution treatment, fine crystals of the ordered lattice phase of γ ₁ phase are homogeneously dispersed in the ground of the disordered lattice phase of γ phase, but the maximum energy product is 2 or more. Is shown. When this is heated at each temperature and tempered, an ordered lattice phase grows and Hc, Br and (BH) max increase with this, but if the tempering temperature becomes too high and the ordered lattice phase grows too much. , The local strain that blocks the movement of the domain wall is relaxed, and Hc, Br and (BH) max are reduced. Further, FIG. 2 shows Hc, Br and (BH) max when heated at each temperature and tempered.
And the tempering time. The higher the tempering temperature, the faster the growth of the ordered lattice phase and the relaxation of local strain. Therefore, the higher the tempering temperature, the shorter the tempering time and the maximum. Therefore, it can be seen that there is an optimum tempering time at each temperature.

In addition, No. 1 in Table 1 was added to the above cast round bar. Three
As a result of using and testing as a magnetic attachment for fixing a denture after heat treatment, it was confirmed that there was a practically sufficient maintaining and fixing force.

Example 2 Alloy No. 76 (Composition Pt = 39
%, Co = 5%, Nb = 1%, Fe = remainder) alloy production Electrolytic iron and platinum of Example 1 as raw materials and 99.8%
Pure cobalt and niobium were used. The dissolution method and template were the same as in Example 1. The obtained round bar was subjected to heat treatment and cold working as shown in Table 2 and the magnet characteristics were measured.

[0038]

[Table 2]

Further, it was melted using a dental titanium casting machine, and this was poured into a mold of the outer crown of the bridge precisely manufactured by the lost wax method. The outer crown of the cast bridge was heated in a vacuum of 1300 ° C. for 1 hour and then rapidly cooled at a rate of 150 ° C./sec (water quenching). Then, after heating at 650 ° C for 2 hours and cooling, the maximum energy product is 21 mega gauss
Oersted magnet characteristics were obtained. As a result of the use, it was found that it has a practically sufficient maintenance fixing force. The properties of typical alloys are as shown in Tables 3 and 4, and each has excellent magnet properties.

[0040]

[Table 3]

[0041]

[Table 4]

Next, in FIGS. 3 to 5, Fe-38% P
Co, Ni, Cu, Mn, Ag, Zr, Hf,
Si, In, Sn, Sb, Ru, Os, Re, Y, N
The relationship between the addition amount of each element of d, B, C or N and the maximum energy product is shown, and in FIG. 6 and FIG.
38% Pt-2% Cu alloy with V, Nb, Ta, Cr,
The relationship between the added amount of each element of Mo, Al, Ti, Ge, Ga, Au, Pd, Rh, or Ir and the maximum energy product is shown. As can be seen from these figures, the addition of each of these elements generally has a large effect of improving the magnet characteristics.
The rare earth element is composed of Sc, Y and lanthanum element, but the effect is equal.

[0043]

INDUSTRIAL APPLICABILITY The alloy of the present invention is a permanent magnet having a maximum energy product of at least 2 megagauss-Oersted and excellent in magnet characteristics, and has good melt fluidity, workability, and corrosion resistance. It is also suitable for tools, dental medical tools, health care tools, etc., and also for electromagnetic parts and devices utilizing the conversion of electromechanical energy.

[Brief description of drawings]

FIG. 1 shows Fe-36 to 39% Pt-2% Cu-.
FIG. 4 is a characteristic diagram showing the relationship between tempering temperature and magnet characteristics for four 1% B-based alloys.

FIG. 2 shows Fe-38% Pt-2% Cu-1% B.
FIG. 4 is a characteristic diagram showing the relationship between tempering time and magnet characteristics at each tempering temperature for alloys.

FIG. 3 is a graph of Fe-38% Pt alloy with Co, Ni,
It is a characteristic view which shows the relationship between the maximum energy product (BH) max when adding Cu or Mn, and the addition amount of each element.

FIG. 4 is a graph of Fe-38% Pt alloy with Ag, Zr,
It is a characteristic view which shows the relationship between the maximum energy product (BH) max when adding Hf, In, Sn, Sb, or Ru and the addition amount of each element.

FIG. 5 is a graph of Fe-38% Pt alloy with Os, Re,
It is a characteristic view which shows the relationship between the maximum energy product (BH) max in the case of adding Y, Nd, B, C, or N and the addition amount of each element.

FIG. 6 is a graph showing the maximum energy product (BH) max and the respective elements when V, Nd, Ta, Cr, Mo, W, Al, or Ti is added to an Fe-38% Pt-2% Cu alloy. It is a characteristic view which shows the relationship with the addition amount.

FIG. 7 shows Fe-38% Pt-2% Cu alloy with G
It is a characteristic view which shows the relationship between the maximum energy product (BH) max when adding e, Ga, Au, Pd, Rh, or Ir and the addition amount of each element.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI technical display location // C22C 38/00 303 A61N 1/42 A

Claims (18)

[Claims] 1. Atomic ratio of Pt 33-47% and Co 20
% Or less, Ni, Cu, Mn, Ag, Zr, Hf, and Si each 10% or less, In, Sn, Sb, Ru, Os,
Re, rare earth element, B, C, N each less than 7% 1
Or a total of 0.001 to 30% of two or more kinds and the balance Fe and a small amount of impurities, and the maximum energy product is 2
A permanent magnet characterized by having at least Mega Gauss Oersted. 2. An atomic ratio of Pt33-4 as a main component
7% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, W, Al and Ti, Ge, G
a, Au, Pd, Rh, Ir each 7% or less of one kind or a total of 0.001 to 20% of 2 or more kinds and the balance F
A permanent magnet comprising e and a small amount of impurities and having a maximum energy product of 2 megagauss-Oersted or more. 3. Atomic ratio of Pt 33 to 47% and Co 20
% Or less, Ni, Cu, Mn, Ag, Zr, Hf, and Si each 10% or less, In, Sn, Sb, Ru, Os,
Re, rare earth element, B, C, N each less than 7% 1
100% / hour or more after heating the alloy containing 0.001 to 30% in total of one or more kinds and the balance Fe and a small amount of impurities at 800 ° C or more and melting point or less for 1 minute or more A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, characterized by being cooled at a rate of. 4. The atomic ratio of Pt is 33 to 47% and Co20.
% Or less, Ni, Cu, Mn, Ag, Zr, Hf, and Si each 10% or less, In, Sn, Sb, Ru, Os,
Re, rare earth element, B, C, N each less than 7% 1
100% / hour or more after heating the alloy containing 0.001 to 30% in total of one or more kinds and the balance Fe and a small amount of impurities at 800 ° C or more and melting point or less for 1 minute or more At the rate of 400 and then 400
The maximum energy product characterized by cooling after heating at a temperature of ℃ to 800 ℃ for 1 minute or more and 1000 hours or less,
A method for manufacturing a permanent magnet having 2 mega gauss Oersted or higher. 5. Atomic ratio of Pt 33-47% and Co 20
% Or less, Ni, Cu, Mn, Ag, Zr, Hf, and Si each 10% or less, In, Sn, Sb, Ru, Os,
Re, rare earth element, B, C, N each less than 7% 1
100% / hour or more after heating the alloy containing 0.001 to 30% in total of one or more kinds and the balance Fe and a small amount of impurities at 800 ° C or more and melting point or less for 1 minute or more At a rate of 30% and then cold working at a working rate of 30% or more.
A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, which comprises heating at a temperature of 00 ° C. for 1 minute or more and 1000 hours or less and then cooling. 6. The atomic ratio of Pt33-4 as the main component.
7% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, W, Al and Ti, Ge, G
a, Au, Pd, Rh, Ir each 7% or less of one kind or a total of 0.001 to 20% of 2 or more kinds and the balance F
An alloy consisting of e and a small amount of impurities is heated at a temperature of 800 ° C. or higher and a melting point or lower for 1 minute or more, subjected to a homogeneous solution treatment, and then cooled at a rate of 100 ° C./hour or higher. A method of manufacturing a permanent magnet having Mega Gauss Oersted or higher. 7. The atomic ratio of Pt33-4 as the main component.
7% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, Al and Ti, Ge, Ga, A
u, Pd, Rh, and Ir each containing 7% or less of one or two or more of 0.001 to 20% in total and the balance Fe and an alloy containing a small amount of impurities are used for 1 minute at a temperature of 800 ° C. or higher and a melting point or lower. After heating and homogenizing solution treatment 1
Cool at a rate of 00 ° C / hour or more, and then 400 ° C to 80
A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, characterized by heating at a temperature of 0 ° C. for 1 minute or more and 1000 hours or less and then cooling. 8. The atomic ratio of Pt33-4 as the main component.
7% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, W, Al and Ti, Ge, G
a, Au, Pd, Rh, Ir each 7% or less of one kind or a total of 0.001 to 20% of 2 or more kinds and the balance F
An alloy consisting of e and a small amount of impurities is heated at a temperature of 800 ° C. or higher and a melting point or lower for 1 minute or more to perform a homogeneous solution treatment, and then cooled at a rate of 100 ° C./hour or higher, and then a working rate of 3
Cold working of 0% or more is performed, and this is further 400-80
A method for producing a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more, which comprises heating at a temperature of 0 ° C. for 1 minute or more and 1000 hours or less and then cooling. 9. The atomic ratio of Pt is 33 to 47% and Co20.
% Or less, Ni, Cu, Mn, Ag, Zr, Hf, and Si each 10% or less, In, Sn, Sb, Ru, Os,
Re, rare earth element, B, C, N each less than 7% 1
Or a total of 0.001 to 30% of two or more kinds and the balance Fe and a small amount of impurities, and the maximum energy product is 2
A medical device consisting of a permanent magnet having Mega Gauss Oersted or higher. 10. An atomic ratio of Pt33-
47% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N each 7% or less of one kind or two or more kinds in total 0.001
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, Al and Ti, Ge, Ga, A
u, Pd, Rh, Ir, each of which is 7% or less, 0.001 to 20% in total of 1 type or 2 types or more, and balance Fe and a small amount of impurities, and has a maximum energy product of 2 megagauss-Oersted or more. A medical device consisting of a magnet. 11. An atomic ratio of Pt 33 to 47% and Co 2
0% or less, Ni, Cu, Mn, Ag, Zr, Hf, Si
10% or less of each, In, Sn, Sb, Ru, O
s, Re, rare earth elements, B, C, and N, each of which is 7% or less in total of 1 to 2 or more, 0.001 to 30% in total, and the balance Fe and a small amount of impurities, and has a maximum energy product of 2 mega gauss. A health and medical device comprising a permanent magnet having Oersted or higher. 12. The atomic ratio of Pt33 to
47% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N each of 7% or less in total of 1 or 2 or more 0.001 to 3 in total
0% and V, Nb, Ta, Cr, Mo as auxiliary components,
10% or less of each of Al and Ti, Ge, Ga, Au,
Each of Pd, Rh, and Ir is 7% or less, and 0.001 to 20% in total of one kind or two or more kinds and the balance Fe and a small amount of impurities, and the maximum energy product is 2 mega gauss.
A health and medical device comprising a permanent magnet having Oersted or higher. 13. Atomic ratio of Pt 33 to 47% and Co 2
0% or less, Ni, Cu, Mn, Ag, Zr, Hf, Si
10% or less of each, In, Sn, Sb, Ru, O
s, Re, rare earth elements, B, C, and N, each of which is 7% or less, or a total of 0.001 to 30%, and the balance Fe and a small amount of impurities, and the maximum energy product is 2 mega Gauss-Oersted. A dental medical device comprising a permanent magnet having the above. 14. The atomic ratio of Pt33 to
47% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, W, Al and Ti, Ge, G
a, Au, Pd, Rh, Ir each 7% or less of one kind or a total of 0.001 to 20% of 2 or more kinds and the balance F
A dental medical device comprising e and a small amount of impurities, and a permanent magnet having a maximum energy product of 2 megagauss-Oersted or more. 15. Atomic ratio of Pt 33 to 47% and Co 2
0% or less, Ni, Cu, Mn, Ag, Zr, Hf, Si
10% or less of each, In, Sn, Sb, Ru, O
s, Re, rare earth elements, B, C, and N, each of which is 7% or less in total of 1 to 2 or more, 0.001 to 30% in total, and the balance Fe and a small amount of impurities, and has a maximum energy product of 2 mega gauss. Cast crowns and bridges with Oersted or better. 16. The atomic ratio of Pt33 to
47% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, W, Al and Ti, Ge, G
a, Au, Pd, Rh, Ir each 7% or less of one kind or a total of 0.001 to 20% of 2 or more kinds and the balance F
Cast crowns and bridges consisting of e and a small amount of impurities and having a maximum energy product of 2 mega gauss Oersted or more. 17. An atomic ratio of Pt 33 to 47% and Co 2
0% or less, Ni, Cu, Mn, Ag, Zr, Hf, Si
10% or less of each, In, Sn, Sb, Ru, O
s, Re, rare earth elements, B, C, and N, each of which is 7% or less in total of 1 to 2 or more, 0.001 to 30% in total, and the balance Fe and a small amount of impurities, and has a maximum energy product of 2 mega gauss. Electromagnetic components and equipment consisting of permanent magnets having Oersted or higher. 18. The atomic ratio of Pt33 to
47% and Co 20% or less, Ni, Cu, Mn, Ag, Z
10% or less of each of r, Hf, and Si, In, Sn, S
b, Ru, Os, Re, rare earth element, B, C, N, each of 7% or less in total, or a total of 0.001-
30% and V, Nb, Ta, Cr, M as accessory components
10% or less of each of o, W, Al and Ti, Ge, G
a, Au, Pd, Rh, Ir each 7% or less of one kind or a total of 0.001 to 20% of 2 or more kinds and the balance F
Electromagnetic components and devices that consist of e and a small amount of impurities and that consist of permanent magnets having a maximum energy product of 2 megagauss-Oersted or higher.