CN107470622A - It is a kind of that the method without rare earth aeolotropic Mn Al C permanent-magnet alloys is prepared by thermal deformation - Google Patents
It is a kind of that the method without rare earth aeolotropic Mn Al C permanent-magnet alloys is prepared by thermal deformation Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 40
- 239000000956 alloy Substances 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 18
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 33
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000002844 melting Methods 0.000 claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 13
- 229910052786 argon Inorganic materials 0.000 claims abstract description 12
- 239000000843 powder Substances 0.000 claims abstract description 11
- 238000010791 quenching Methods 0.000 claims abstract description 10
- 230000000171 quenching effect Effects 0.000 claims abstract description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052802 copper Inorganic materials 0.000 claims abstract description 9
- 239000010949 copper Substances 0.000 claims abstract description 9
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 238000007731 hot pressing Methods 0.000 claims abstract description 7
- 238000005516 engineering process Methods 0.000 claims abstract description 5
- 239000000126 substance Substances 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000000280 densification Methods 0.000 claims abstract 2
- 229910016583 MnAl Inorganic materials 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 238000005868 electrolysis reaction Methods 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 238000005554 pickling Methods 0.000 claims description 4
- 239000003708 ampul Substances 0.000 claims description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000007499 fusion processing Methods 0.000 claims description 3
- 230000005389 magnetism Effects 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 239000002243 precursor Substances 0.000 claims description 3
- 238000000746 purification Methods 0.000 claims description 3
- 239000010453 quartz Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 claims description 3
- 230000005307 ferromagnetism Effects 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims 4
- 229910052742 iron Inorganic materials 0.000 claims 2
- 238000005303 weighing Methods 0.000 claims 1
- 239000012300 argon atmosphere Substances 0.000 abstract 2
- 238000009770 conventional sintering Methods 0.000 abstract 1
- 238000010891 electric arc Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 description 8
- 239000000696 magnetic material Substances 0.000 description 6
- 235000019441 ethanol Nutrition 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 239000002932 luster Substances 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 229910001172 neodymium magnet Inorganic materials 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- CPRNGDFEMIQHJA-UHFFFAOYSA-N [Sr].[Ba].[Fe] Chemical group [Sr].[Ba].[Fe] CPRNGDFEMIQHJA-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/086—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together sintered
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/105—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding
- B22F2003/1051—Sintering only by using electric current other than for infrared radiant energy, laser radiation or plasma ; by ultrasonic bonding by electric discharge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
- B22F2009/048—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by pulverising a quenched ribbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The method without rare earth aeolotropic Mn Al C permanent-magnet alloys is prepared by thermal deformation the invention discloses a kind of, its step is：(1) simple substance element is chosen, matches foundry alloy sample composition：Stoichiometrically match Mn52Al46C2Alloy, need argon arc melt back just can sample；(2) melt-spun：1. proportioning foundry alloy is put into water jacketed copper crucible, the electric arc melting under high vacuum argon atmosphere, melt back 4 ~ 6 times, the uniform alloy of composition is obtained.2. copper roller fast quenching into strip sample, obtains ε phases under argon atmosphere by melted MnAlC alloys.(3) grind：By strip sample grind into powder.(4) discharge plasma sintering：Powder sample is put into sintering furnace and carries out densification sintering, the sintering technology has the characteristics that heating rate is fast, sintering time is short using electric discharge thermal sintering caused by Joule heat and electric discharge compared to conventional sintering.(5) thermal deformation：Discharge plasma sintering block is put into hot pressing furnace and carries out thermal deformation, obtains anisotropy MnAlC permanent-magnet alloys.
Description
Technical field
The present invention relates to the preparation of anisotropy Mn-Al-C permanent-magnet alloys and its property research, more particularly to one kind to pass through
The method that thermal deformation prepares anisotropy Mn-Al-C permanent-magnet alloys.
Background technology
Permanent-magnet material field, occupy leading position in domestic and international market is barium strontium iron in low-end applications field respectively
Oxysome and the rare earth permanent magnet of high-end field.Rare earth permanent-magnetic material such as NdFeB and SmCo are widely used in all kinds of electronic products, medical treatment
The field such as information and communication.Consumption of the rare earth in rare earth permanent-magnetic material occupies the nearly half of rare earth total flow, the mistake of rare earth
Cross the worry that consumption causes scholar in the industry and relevant departments.For the cost of raw material and national strategy security standpoint, inexpensive,
The research and development of the new non-rare earth permanent-magnetic material of high performance-price ratio are imperative.Wherein there is the MnAl of unique ferromagnetism τ phases
Alloy is exactly the non-rare earth permanent-magnetic material of candidate a kind of, and it has good comprehensive magnetic energy, superior machining property, high ratio
Intensity and high modulus of elasticity, while there is stronger corrosion resistance again, and its cost of raw material is relatively low（Mn elements are widely distributed
In the earth's crust, and reserves of the Al elements in the earth's crust are only second to O and Si elements, are abundance highest metallic elements）, have larger
Potential use value.
Thermal deformation method is the processing mode to there is certain consistency magnet to carry out jumping-up or extruding etc., in terms of magnetic material,
It has been successfully applied to prepare high-performance anisotropy Nd-Fe-B magnets at present.MnAl permanent-magnet materials research at present is more with powder
Based on band, and all it is isotropism, magnetic property is relatively low.And the requirement of practical application is that magnetic property is excellent, consistency is higher
With the block of shape diversification, here we thermal deformation technology is incorporated into MnAl permanent magnetism systems, and in order to ensure to be hot pressed into
The integrality and high-compactness of product, to have presoma of the discharge plasma sintering magnet of certain consistency as hot pressing,
The hole and non-magnetic phase inside magnet are further reduced by hot pressing, prepares anisotropy MnAl permanent magnets, and can facilitate
Cut out variously-shaped, application value is higher.Alloying component or Deformation Parameters etc. can be changed simultaneously to take with difference to obtain
To the MnAl block materials of degree and magnetic property.
Although carry out correlative study to Mn-Al-C permanent-magnet alloys both at home and abroad at present, but to being prepared using thermal deformation technology
The correlative study of anisotropy MnAl permanent magnets is also very deficient.Mn-Al-C has excellent as a kind of non-rare earth permanent-magnetic material
Different comprehensive magnetic energy, compared to other permanent-magnet materials, cost is cheap, and mechanical property is also more superior with corrosion resistance, has very
Big application prospect, it is expected to be used widely in the technical fields such as new-energy automobile, wind-power electricity generation.
The content of the invention
Prepared object of the present invention is to provide one kind by thermal deformation without rare earth aeolotropic Mn-Al-C permanent-magnet alloys
Method, it has the advantages that anisotropy, magnetic property and excellent in mechanical performance.
The present invention is achieved like this, and method and step is：
(1) foundry alloy sample composition is matched：Stoichiometrically proportioning needed for alloy sample, use purity for 99.8% electricity
It is original material to solve the Al that Mn, purity are 99.996% and the C that purity is 99.99%, wherein electrolysis Mn needs pickling and anti-through argon arc
After remelt refining purification can sample, while consider volatilization of the Mn elements in fusion process, need to additionally add necessarily during sample
The Mn elements of amount.
(2) melt-spun：The simple substance element matched is put into water-cooled copper crucible, vacuum is evacuated to 1.0 × 10-3Pa
It is filled with the high-purity argon gas of 1 atmospheric pressure behind left and right, prepares melting, first melts Zr blocks during melting, it is absorbed oxygen remaining in stove
Gas, avoid needing remelting 4 ~ 6 times repeatedly when required sample oxidation and melting sample, to obtain the uniform alloy sample of composition；Will be molten
The alloy sample refined is put into quartz ampoule after abrasive machine is polished, and makes alloy by sensing heating under the atmosphere of high-purity argon gas
Mass melts, through copper roller fast quenching into strip.
(3) grind：Fast quenching thin strap is ground into sintered precursor powder with agate and pestle, can suitably be dripped in process of lapping
Enter alcohol or ground in glove box, mitigate the oxidation of powder.
(4) discharge plasma sintering（SPS）：A certain amount of grounds travel is put into sintering mold, in the state of high vacuum
Lower sintering, sintering temperature are 700 DEG C, and sintering pressure and time are respectively 50MPa and 5min.
(5) thermal deformation：Discharge plasma sintering MnAlC magnets are put into hot pressing furnace and carry out thermal deformation, deformation temperature is
700 DEG C, deflection is 60% or so, and anisotropy Mn-Al-C permanent-magnet alloys can be obtained after thermal deformation.
Step（One）The simple substance element orders gained by promise green wood in Beijing, Al and C element purity 99.9% with
On, the sheet that wherein Mn elements are 99.8% is electrolysed Mn, needs the multiple melt back of pickling, and melting Mn block surface oxide layers are beaten
Mill, can sample when cutting off the metallic luster of uniform silvery white.
Step（Two）The melt-spun all needs vacuum being evacuated to 1.0 × 10-3Pa or so, under the atmosphere of high-purity argon gas
Complete.During the melting starting the arc, electric current should not be too big and to adjust tungsten needle and the distance of sample, is splashed to prevent sample or the starting the arc is lost
Lose；When fast quenching gets rid of band, induced-current need to be slowly increased, and be heated evenly sample, be sprayed to during molten condition using pressure differential
It is incident upon rotary copper roller, you can band needed for acquisition.
Step（Three）The grinding is that picking has metallic luster and the less alloy thin band of burr, in absolute ethyl alcohol or argon
Start to grind under the protection of gas, needed before grinding agate pot and pestle alcohol wipe is clean.
Step（Four）Described be sintered under high vacuum state is completed, and the thermocouple in sintering temperature is had by insertion dress original mold is supervised
Survey, sintering pressure is calculated by the sectional area of mould therefor and obtained.
Step（Five）The thermal deformation is completed under high vacuum state, is continuously increased effective pressure, pressure stroke is with presetting
Deflection it is consistent when, deformation stage terminates, and with the cold acquisition anisotropy magnet of stove, magnet then is carried out into wire cutting, to enter
The various performance characterizations of row.
The solution have the advantages that：The present invention is prepared without rare earth aeolotropic Mn-Al-C permanent-magnet alloys, compared to conventional system
Standby MnAl alloys, there is the advantages of magnetic anisotropy, compactness height and machining property is good, more closing to reality application.
Brief description of the drawings
Fig. 1 is with the XRD of Mn-Al-C alloy thin bands made from 15m/s FFR'S fuel assemblies.
The XRD of 700 DEG C of discharge plasma sintering Mn-Al-C magnets of Fig. 2, sintering condition are 700 DEG C of -50MPa-
5min。
The XRD of Fig. 3 thermal deformation Mn-Al-C magnets（The face vertical with pressure direction）.
The hysteresis curve figure of Fig. 4 thermal deformation Mn-Al-C magnets（It is vertical and horizontal with deformation direction to be divided into externally-applied magnetic field）.
The micro-organization chart of 700 DEG C of discharge plasma sinterings of Fig. 5 and thermal deformation Mn-Al-C magnets,（a）With（b）To put
The SEM figures of electric plasma agglomeration magnet；（c）With（d）Scheme for the SEM of heat distortion magnet.
Embodiment
(1) foundry alloy sample composition is matched：Stoichiometrically alloy sample needed for proportioning, uses purity as 99.8%
Electrolysis Mn, purity be 99.996% Al and purity be 99.99% C be original material, wherein electrolysis Mn need pickling and argon arc
After melt back purification can sample, need to additionally be added while in view of the volatilization in Mn element fusion process, during sample certain
The Mn elements of amount.
(2) melt-spun：The simple substance element prepared is put into water-cooled copper crucible, vacuum is evacuated to 1.0 × 10-3Pa is left
It is filled with the high-purity argon gas of 1 atmospheric pressure behind the right side, prepares melting, first melts Zr blocks during melting, it is absorbed oxygen remaining in stove,
Remelting 4 ~ 6 times is needed when sample oxidation needed for avoiding and melting sample, to obtain the uniform alloy sample of composition；By melted conjunction
Golden sample is put into quartz ampoule after abrasive machine is polished, and melts alloy block by sensing heating under the atmosphere of high-purity argon gas
Change, through copper roller fast quenching into strip.
(3) grind：Fast quenching thin strap is ground into sintered precursor powder with agate pot and pestle, can be appropriate in process of lapping
Instill alcohol or ground in glove box, mitigate the oxidation of powder.
(4) discharge plasma sintering（SPS）：A certain amount of grounds travel is put into sintering mold, in the state of high vacuum
Lower sintering, sintering temperature are 700 DEG C, and sintering pressure and time are respectively 50MPa and 5min.
(5) thermal deformation：Discharge plasma sintering MnAlC magnets are put into hot pressing furnace and carry out thermal deformation, are obtained each to different
The Mn-Al-C permanent-magnet alloys of property.
Present embodiment obtains high temperature ε phases by way of getting rid of band, compared to the mode of long-time heat preservation quenching, reduces system
Standby cost, while what is finally prepared is to have anisotropy, high-compactness and the excellent block materials of magnetic property, compared to powder
Deng sample, industrialization practical application is more nearly, can be used as and prepare a kind of effective side of anisotropy MnAlC permanent-magnet materials
Method.
Although introducing and describing the embodiment of the present invention, the invention is not limited in this, but can also
To be implemented except the other modes in the range of the technical scheme defined in appended claims, for example tune can also be passed through
Deformation temperature and deflection are saved, to want to change anisotropic degree or the permanent magnetism performance of Mn-Al-C magnets, while
Other elements are doped in MnAlC alloys by the composition of adjustable alloy, further to explore sintering with heat pressing process to magnetic
The influence of the magnetic properties such as body anisotropy.
Claims (4)
1. a kind of prepare the method without rare earth aeolotropic Mn-Al-C permanent-magnet alloys by thermal deformation, it is characterised in that the side
Method comprises the following steps：
(1) foundry alloy sample composition is matched：Stoichiometrically proportioning needed for alloy sample, use purity for 99.8% electricity
It is raw material to solve the Al that Mn, purity are 99.996% and the C that purity is 99.99%, wherein electrolysis Mn need pickling and through argon arc repeatedly
After melting purification can sample, while consider volatilization of the Mn elements in fusion process, need to additionally add during sample a certain amount of
Mn elements；
(2) melt-spun：The simple substance element that weighing has matched is put into water-cooled copper crucible, vacuum is evacuated to 1.0 × 10-3 Pa
It is filled with the high-purity argon gas of 1 atmospheric pressure behind left and right, prepares melting, first melts Zr blocks during melting, it is absorbed oxygen remaining in stove
Gas, it need to repeat 4 ~ 6 times during melting sample, to obtain uniform alloy sample；Melted alloy sample is polished through abrasive machine
After be put into quartz ampoule, melt alloy block by sensing heating under the atmosphere of high-purity argon gas, by copper roller fast quenching into thin
Band；
(3) grind：Fast quenching thin strap is ground into sintered precursor powder with agate pot and pestle, can suitably be instilled in process of lapping
Alcohol is ground in glove box, mitigates the oxidation of powder；
(4) discharge plasma sintering（SPS）：A certain amount of grounds travel is put into sintering mold, burnt in the state of high vacuum
Knot, sintering temperature are 700 DEG C, and sintering pressure and time are respectively 50MPa and 5min；
(5) thermal deformation：MnAlC magnets after discharge plasma sintering are put into hot pressing furnace and carry out thermal deformation, are obtained each to different
Property Mn-Al-C permanent-magnet alloys.
2. a kind of as claimed in claim 1 prepare the method without rare earth aeolotropic Mn-Al-C permanent-magnet alloys by thermal deformation,
Characterized in that, the accounting for the band principal phase ε phases that the fast quenching obtains need to be higher, base is established to obtain high content iron magnetic τ phases
Plinth.
3. a kind of as claimed in claim 1 prepare the method without rare earth aeolotropic Mn-Al-C permanent-magnet alloys by thermal deformation,
Characterized in that, the selection of the sintering condition is mainly according to MnAl phasors and the densification degree of sintered body, while according to iron
The acquisition methods of magnetic τ phases, its process sintered is namely annealed to ε phases obtains the process of ferromagnetism τ phases.
4. a kind of as claimed in claim 1 prepare the method without rare earth aeolotropic Mn-Al-C permanent-magnet alloys by thermal deformation,
Thermal deformation is carried out characterized in that, discharge plasma sintering MnAlC magnets are put into hot pressing furnace, with reference to MnAl binary phase diagramls,
Simultaneously in view of the presence of C element, deformation temperature is set to 700 DEG C, and deflection is 60% or so；Deformation with stove it is cold after, you can obtain
Anisotropy MnAlC permanent magnets, and magnetic property is preferable, the block and powder sample obtained compared to other existing technologies of preparing, respectively
The more closing to reality application of anisotropy permanent magnetism MnAl permanent magnets.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109972027A (en) * | 2018-12-24 | 2019-07-05 | 南昌航空大学 | A method of mutually adding preparation anisotropy CeFeB permanent-magnet alloy by low melting point PrCu intergranular |
| CN110093528A (en) * | 2019-05-20 | 2019-08-06 | 上海交通大学 | A kind of preparation method of porous Mn-Al-C ferromagnetic shape memory alloy |
| CN111712340A (en) * | 2018-02-06 | 2020-09-25 | 西门子股份公司 | Method for selectively irradiating a layer of material, method of manufacturing and computer program product |
| CN113151719A (en) * | 2020-12-21 | 2021-07-23 | 杭州电子科技大学 | Rare earth-free MnAlIn permanent magnetic alloy and preparation method thereof |
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| WO2005087963A1 (en) * | 2004-03-11 | 2005-09-22 | Japan Science And Technology Agency | Bulk solidified quenched material and process for producing the same |
| CN102655050A (en) * | 2012-05-04 | 2012-09-05 | 江苏大学 | Method for preparing high-performance high-temperature-resisting nanometer composite permanent magnet |
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| CN109972027A (en) * | 2018-12-24 | 2019-07-05 | 南昌航空大学 | A method of mutually adding preparation anisotropy CeFeB permanent-magnet alloy by low melting point PrCu intergranular |
| CN110093528A (en) * | 2019-05-20 | 2019-08-06 | 上海交通大学 | A kind of preparation method of porous Mn-Al-C ferromagnetic shape memory alloy |
| CN113151719A (en) * | 2020-12-21 | 2021-07-23 | 杭州电子科技大学 | Rare earth-free MnAlIn permanent magnetic alloy and preparation method thereof |
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