CN1061460C - Carbide permanent magnet and its prepn. method - Google Patents
Carbide permanent magnet and its prepn. method Download PDFInfo
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- CN1061460C CN1061460C CN97115069A CN97115069A CN1061460C CN 1061460 C CN1061460 C CN 1061460C CN 97115069 A CN97115069 A CN 97115069A CN 97115069 A CN97115069 A CN 97115069A CN 1061460 C CN1061460 C CN 1061460C
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Abstract
The present invention relates to a carbonide water magnet of which the chemical formula is RFe (12-x-y)TMxGayCz, wherein R is at least one rare-earth element selected from Ce, Pr, Nd and Tb, and TM is at least one element selected from Ti, Zr, Hf, Nb, Ta, Cr, V, Mo and W. Moreover, x is bigger than 1 but is smaller than 2, y is bigger than 0.5 but is smaller than 1, and z is bigger than 0.4 but is smaller than 1. A preparation method for the carbonide permanent magnet comprises the following steps: a multiple smelting method of an induction furnace is utilized to prepare Fe-C alloy; raw materials: metal Fe, Fe-C, R and TM and Ga, are prepared according to the components of the alloy; the alloying procedure is carried out in shielding gas atmosphere at the prescribed furnace temperature, and ingots are cast in a junker mould to be made into magnets. High-carbon mother alloy is utilized, and therefore, a ThMn12 type permanent magnet with stable structure can be obtained by directly using a smelting-casting method.
Description
The present invention relates to a kind of carbide permanent magnet, particularly, relate to and a kind ofly have a ThMn of stablizing by what rare earth element, iron and carbon were formed
12The carbide permanent magnet of type crystal structure.
Existing ThMn
12The type permanent magnetic material, head sees people such as Yang Yingchang, at the Chinese patent of application on November 16 nineteen ninety: No. 9010166.9, CN.In this patent, provide a kind of and made with general formula R (Fe by Technology for Heating Processing
1-aM)
12N
xThe permanent magnetic material of expressing.Can obtain high-curie temperature, high saturation and magnetic intensity and high built-up magnet and the bonded permanent magnet of rectifying neck power by this material.But existing nitride permanent-magnet material has a common shortcoming, and after temperature is higher than 650 ℃, the gap nitrogen-atoms will be overflowed from lattice, and original excellent magnetic can be lost.So this type of nitride can only be made bonded permanent magnet at present, and can not make fine and close sintered magnet, and its serviceability temperature also is subjected to strict restriction.In addition, such nitride all passes through the diffusion process of gas phase one solid phase reaction, makes nitrogen-atoms enter intracell, and not only course of reaction is time-consuming long, and is difficult to control uniformity in product performance.
The present invention makes invention in view of above-mentioned shortcoming, and its objective is provides a kind of stable carbide permanent magnet, can the actual sintered magnet that uses thereby obtain.
For achieving the above object, the carbide permanent magnet according to the present invention, its chemical formula is:
RFe
12-x-yTM
xGa
yC
zWherein,
R is a kind of rare earth element of selecting at least among Ce, Pr, Nd, Tb and the Dy, and
1＜x＜2，0．5＜y＜1，0．4＜z＜1。
Preferably R is Pr or Nd, and TM is V, Mo or Ti.
And the x value is in the 1.3-1.7 scope, and the y value is in the 0.7-0.8 scope, and the z value is about 0.8.
The present invention is owing to taked the foundry alloy of high-carbon content, and add an amount of transition metal TM and help constitutionally stable Ga, by the cooling rate of strictness control alloy, thereby can directly obtain having the constitutionally stable ThMn that contains interstitial carbon with smelting-casting
12Type permanent magnet (accurate 1: 12 type intermetallic compound).Utilize this ThMn
12The type permanent magnetic material, after crushed, just can be made into high-performance with conventional powder metallurgic method can practical sintered magnet, or also can be made into bonded permanent magnet or hot-pressed magnets through revolving the technology powder process of quenching.
Fig. 1 is RFe
12The single cell structure of type intermetallic compound.
RFe
12-x-yTM
xGa
yC
zThe single cell structure of intermetallic compound, as shown in Figure 1. In the drawings, each unit cell contains the brilliant positions of 2 a (8/8+1/1=2), and the R atom occupies the brilliant position of a. Fe12-x-yTM
xGa
yAtom occupies f, i and three kinds of brilliant positions of j, and wherein the brilliant position of i and j is only occupied by the Fe atom. Prove that through neutron-diffraction study the TM atoms that adds occupies the brilliant position of part i. The Ga atom also can enter the brilliant position of f or j except entering the brilliant position of i. Then be positioned at the brilliant position by the b at the octahedral interstices center of 4 Fe atoms and 2 R atomic buildings as for the C atom. Each unit cell of this kind room contains two (4/4=2/2=2). Each unit cell contains two R atoms, 24 Fe atoms (comprising TM and Ga) and 2 C atoms. Therefore, the chemical formula of this compound is: R2Fe
24-x-yTM
xGa
yC
zOr subtract and be about RFe12-x-yTM
xGa
yC
z The TM element that adds is the solid solution wider with Fe element forming component all, can freely replace iron atom, and its atom or ionic radius are slightly larger than the radius of ferro element. Therefore can understand that the space of part octahedral interstices will increase owing to entering of TM atom, stablize therebetween resident thereby be conducive to carbon atom. In other words, significantly reduced the distortion that lattice produces owing to carbon atom enters, the stability of structure therefore increases. The stabilizing mechanism of Ga is equally also like this. Can directly be separated out by liquid state under suitable cooling velocity just because of 1: 12 type structure of standard of having done above-mentioned important adjustment at composition, made to contain interstitial atom. What should emphatically point out is, under the suitable cooling velocity, could form that to have a required as-cast structure most important, cooling velocity is too fast, although can avoid the segregation of composition, forms isotropic microstructure, can not get excellent magnetic, particularly remanent magnetism is lower, only under suitable cooling velocity, could form the column crystal of desired structure. Therefore can prepare monocrystalline particle, thus but the dense sintering magnet of processability excellence. In addition, be also pointed out that not all octahedral voids is all occupied by the C atom, so z＜1. Just because of this characteristic, can make magnetic characteristic change in wider scope of compound by the change of phosphorus content.
According to the requirement of alloying component, C content should be in 1.0～1.8wt%. Therefore, the smelting of the preparation of raw material foundry alloy and finished product alloy namely becomes the key for preparing alloy. In addition, in order to obtain required crystalline structure, adopted the but junker mold of speed of controlled refrigeration.
At first, carry out the preparation process of foundry alloy. In preparation, adopt multiple smelting method, smelt the Fe-C alloy with 50Kw, 10Kg induction furnace, make its C content greater than 1.8wt%. The Fe raw material is ingot iron, and carbon is the electric arc carbon-point. In smelting process, at first induction furnace is evacuated to 1～5 * 10-3Pa passes into protective gas again, for example passes into argon gas to 1.5 atmospheric pressure, under protective atmosphere, and the heating pure iron. Carbon-point is put into molten iron several times, and along with the increase of carbon content, the temperature of smelting is reduced to 1480 ℃ gradually by 1600 ℃. Adopt the controllable junker mold of cooling rate during casting.
Secondly, carry out the smelting step of alloy. By alloying component preparation raw material Fe, Fe-C, R, TM metal and Ga, the raw material of preparation is placed in the induction furnace, be evacuated down to 1 * 10-4Pa passes into high pure protective gas, and air pressure is 0.8～1.5atm, and furnace temperature setup control temperature range is to carry out alloying in 1450～1600 ℃.
Above-mentioned raw material, preferably R is Pr or Nd. Preferably TM is V, Mo or Ti. And the better scope of the value of x is 1～2, and optimum range is 1.3～1.7. If the x value less than 1 o'clock, just is difficult to form the tetragonal structure of 1: 12 type, and when the x value greater than 2 the time, then significantly reduce the magnetic property of magnet. The existence of Ga mainly is to make Stability Analysis of Structures and promote fusing into of carbon. The better scope of y value is 0.5～1.0, and optimum range is 0.7～0.8, less than 0.5 or greater than 1.0, the static stabilization of structure is all significantly weakened. In addition, C can change the mutual exchanging action of R and Fe atom pair as interstitial atom, so the magnetic of alloy is extremely responsive to the content of carbon. The better scope of z is 0.5～0.9, and the increase that the best is about 0.8, z value can increase the difficulty of smelting process greatly, and the z value is less than 3.4 remarkable variation of magnetic then, and particularly coercivity is almost completely lost.
Subsequently, carry out the ingot casting step. For the uniformity that guarantees the ingot casting composition and avoid segregation, so adopting a kind of cooling velocity is in 50～1000 ℃ of/second scopes, the flat double loop junker mold that its speed can be controlled carries out ingot casting, so that column crystal penetrates whole ingot casting section, does not allow to occur shrinkage cavity.
At last, carry out the ingot homogenization heat treatment step. Ingot casting is placed in the stove, carries out homogenising at 1050～1120 ℃ and process 12 hours or above time.
By component NdFe
9.8Mo
1.5Ga
0.7C
0.8(Nd by weight percentage
16.1Fe
61.2Mo
16.1Ga
5.5C
1.1), adopting technical pure Fe, Fe-C alloy, Mo sheet and purity is that 99.5% Nd and purity are 99.9% Ga preparation raw material.Adopt the 10Kg induction furnace, be evacuated to 2 * 10
-4Pa is raised to needed temperature, adds protective gas.Smelt the later stage and add Ga, be injected in the water cooled mo(u)ld after smelting is finished.Then, in protective atmosphere, carried out homogenizing cast ingot 12 hours.
By component NdFe
9.8V
1.5Ga
0.7C
0.8(Nd by weight percentage
17.4Fe
66.2V
9.3Ga
5.9C
1.2) alloyage, carry out the technology identical then with embodiment 1.
Embodiment 3
By component NdFe
9.8Ti
1.5Ga
0.7C
0.8(Nd by weight percentage
17.56Fe
66.57Ti
8.75Ga
5.95C
1.17) alloyage, carry out the technology identical then with embodiment 1.
By component PrFe
9.8V
1.5Ga
0.7C
0.8(Pr by weight percentage
17.13Fe
66.47V
9.29Ga
5.94C
1.17) alloyage, carry out the technology identical then with embodiment 1.The intrinsic magnetic properties of composition alloy shown in table 1 the foregoing description
Embodiment 5
| Alloying component | T c，°K | Ms，emu／g | Ha，kOe |
| NdFe 9．8Mo 1．5Ga 0．7C 0．8 | 630 | 105．3 | 100 |
| NdFe 0．8V 1．5Ga 0．7C 0．8 | 792 | 140．2 | 110 |
| NdFe 0．8Ti 1．5Ga 0．7C 0．8 | 705 | 130．3 | 88 |
| PrFe 9．8V 1．5Ga 0．7C 0．8 | 720 | 118．4 | 103 |
By component Nd
0.9Dy
0.1Fe
9.8V
1.5Ga
0.7C
0.8Alloyage carries out the technology identical with embodiment 1 then.Be 1050 ℃ through broken powder process, die mould, sintering temperature and be fired into compactness magnet.Alignment magnetic field during moulding is 20kOe, magnet performance: Br=1.28T, and iHc=8.3kOe, (BH)
Max=34.6MGOe.
Embodiment 6
By component PrFe
9.8V
1.5Ga
0.7C
0.8Alloyage carries out the technology identical with embodiment 5 then.Make the magnet performance of compactness magnet: Br=1.2T, iHc=7.8kOe, (BH)
Max=32MGOe.
Embodiment 7
By component NdFe
9V
2.3Ga
0.7C
0.8Alloyage carries out the technology identical with embodiment 5 then.Make the magnet performance of compactness magnet: Br=0.75T, iHc=6.0kOe, (BH)
Max=13MGOe.
By component NdFe
10V
1.5Ga
0.5C
0.6Alloyage carries out the technology identical with embodiment 5 then.Make the magnet performance of compactness magnet: Br=0.93T, iHc=4kOe, (BH)
Max=6.7MGOe.
Embodiment 9
By component NdFe
11V
0.5Ga
0.5C
0.4Alloyage carries out the technology identical with embodiment 5 then.Make the magnet performance of compactness magnet: Br=1.1T, iHc=2.8kOe, (BH)
Max=4.6MGOe.
Embodiment 10
By component Nd
0.9Tb
0.1Fe
9.8V
1.5Ga
0.7C
0.8Alloyage carries out the technology identical with embodiment 5 then.Make the magnet performance of compactness magnet: Br=1.22T, iHc=9.1kOe, (BH)
Max=35.3MGOe.
Ingot casting after the homogenizing heat treatment adopts the powder metallurgical technique that proposes, and carries out sintering under 980～1080 ℃ sintering temperature, requires speed to be chilled to 780 ℃, is cooled to room temperature after the short stay, and makes sintered magnet.
As for making bonded permanent magnet, melt can be revolved broken after, handle through crystallization, protective medium is pulverized down and is made the Magnaglo that the certain granules degree distributes, and adds a certain proportion of binding agent then, compression moulding is made bonded permanent magnet through cured.The above-mentioned alloy pig that melt revolves broken usefulness that supplies does not need to carry out the heat treatment of fast cold-peace homogenizing.
Claims (3)
1, a kind of carbide permanent magnet, its chemical formula is:
RFe
12-x-yTM
xGa
yC
zWherein,
R is a kind of rare earth element of selecting at least among Ce, Pr, Nd, Tb and the Dy,
TM is a kind of element of selecting at least among Ti, Zr, Hf, Nb, Ta, Cr, V, Mo and the W, and
1＜x＜2，0．5＜y＜1，0．4＜z＜1。
2, carbide permanent magnet according to claim 1 is characterized in that, above-mentioned R is Pr or Nd, and above-mentioned TM is V, Mo or Ti.
3, carbide permanent magnet according to claim 1 and 2 is characterized in that, the x value is in 1.3～1.7 scopes, and the y value is in 0.7～0.8 scope, and the z value is 0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115069A CN1061460C (en) | 1997-08-01 | 1997-08-01 | Carbide permanent magnet and its prepn. method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97115069A CN1061460C (en) | 1997-08-01 | 1997-08-01 | Carbide permanent magnet and its prepn. method |
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| Publication Number | Publication Date |
|---|---|
| CN1173721A CN1173721A (en) | 1998-02-18 |
| CN1061460C true CN1061460C (en) | 2001-01-31 |
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|---|---|---|---|
| CN97115069A Expired - Fee Related CN1061460C (en) | 1997-08-01 | 1997-08-01 | Carbide permanent magnet and its prepn. method |
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| US10351935B2 (en) * | 2014-09-09 | 2019-07-16 | Toyota Jidosha Kabushiki Kaisha | Magnetic compound and method of producing the same |
| US10062482B2 (en) * | 2015-08-25 | 2018-08-28 | GM Global Technology Operations LLC | Rapid consolidation method for preparing bulk metastable iron-rich materials |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095182A (en) * | 1993-05-07 | 1994-11-16 | 中国科学院物理研究所 | A kind of rare earth of sowing that contains---iron-base permanent-magnet carbide and preparation method thereof |
| CN1113964A (en) * | 1994-05-10 | 1995-12-27 | 中国科学院金属研究所 | Rare-earth permanent magnetic material using 1:12 type compound as main phase |
-
1997
- 1997-08-01 CN CN97115069A patent/CN1061460C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1095182A (en) * | 1993-05-07 | 1994-11-16 | 中国科学院物理研究所 | A kind of rare earth of sowing that contains---iron-base permanent-magnet carbide and preparation method thereof |
| CN1113964A (en) * | 1994-05-10 | 1995-12-27 | 中国科学院金属研究所 | Rare-earth permanent magnetic material using 1:12 type compound as main phase |
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|---|---|
| CN1173721A (en) | 1998-02-18 |
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