CN1185009A - Rare-earth permanet magnet material with insulation performance - Google Patents
Rare-earth permanet magnet material with insulation performance Download PDFInfo
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- CN1185009A CN1185009A CN97121777A CN97121777A CN1185009A CN 1185009 A CN1185009 A CN 1185009A CN 97121777 A CN97121777 A CN 97121777A CN 97121777 A CN97121777 A CN 97121777A CN 1185009 A CN1185009 A CN 1185009A
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Abstract
It is partic. suited for preparing rare earth permanent magnet material with high insulativity. The composition of the material are: epoxy resin paint 1-10%, polyvinyl acetal 0-10%, silane coupling agent 0-8%, epoxy polyester 0.5-10%, and rare earth permannet magnet alloy powder. Comparing with prior technique, this material has advantages as following: the permanent magnetic body itself does not generate heat when it is used in alternating magnetic field with higher frequency, no loss of magnetism, has excellent insulativity.
Description
Involved in the present invention is the rare earth permanent-magnetic material field.Be particularly useful for making the insulation rare earth permanent-magnetic material that has than high-insulativity.
In the prior art at present, people generally all do not consider the insulation property of this material to the use of permanent magnetic material.But rare earth permanent-magnetic material is used in the environment that needs insulation, the solution that it adopted also only is to permanent magnet surfaces coating insulating material, and for example the Japanese patent gazette spy opens a kind of many magnetic poles electric insulation R-Fe-B permanent magnet of having introduced in flat 8-279407 number.The preparation method of this magnet is identical with conventional production methods, be about to the broken powder process of R-Fe-B alloy cast ingot, compression moulding, sintering, obtain rare-earth permanent magnet after the heat treatment, adopt the method for vacuum evaporation then, be coated with the resin thin film layer of the polyimide of 2-10 μ m every magnet surface, this coatings has electrical insulating property.This class rare-earth permanent magnet just is coated with very thin insulating material on the surface of magnet, uses under the alternating magnetic field of higher-frequency, because of magnet produces the heavy losses that the eddy current self-heating causes magnetic property.Heat is too high, and coatings is destroyed and make magnet forfeiture insulation characterisitic.So the use of this insulating magnet has significant limitation.
As everyone knows, metal object can produce eddy current and generate heat under the high-frequency electric field of alternation, and the metal permanent magnet is no exception, also will produce induced electromotive force as rare earth permanent-magnetic material in the upper frequency alternating magnetic fields.For the metal object of large-size, its resistance is less relatively, and this moment will be very big by the induced current that electromotive force produced.This faradic streamline is closed swirl shape, i.e. eddy current.Be transferred away the electric current of eddy current in lead, and can only be to make object heating itself, cause the loss of energy.Therefore large-sized rare-earth permanent magnet uses under the upper frequency alternating magnetic fields, can produce eddy current and heating equally.Because the magnetic property and the temperature of rare earth permanent-magnetic material have very strong dependence, promptly the magnetic property of with temperature rising magnet itself reduces, so rare-earth permanent magnet is excessive as if the eddy current that produces, and the heating that magnet then can be violent causes magnet significantly to demagnetize.Solving rare-earth permanent magnet and use under the upper frequency alternating magnetic fields and do not generate heat, guarantee the solution that the permanent magnet magnetic performance is not suffered a loss, is that rare-earth permanent magnet itself is prepared into the rare earth permanent magnet insulator with fine insulating properties.
The objective of the invention is to propose the insulation rare earth permanent-magnetic material wide that a kind of permanent magnet itself has insulating property (properties) with the scope of application.
Insulation rare earth permanent-magnetic material proposed by the invention is to be formed by rare earth permanent magnet alloy powder end and binding agent, insulation additive combination, and it is characterized in that forming the insulate composition of rare earth permanent-magnetic material is (weight %): epoxy resin is 1-10%; Epoxy polyester lacquer (EIU) is 0.5-10%; Polyvinyl butyral resin (PVB) is 0-10%; Silane coupler (KH) is 0-8%; All the other are the rare earth permanent magnet alloy powder end.Granularity at insulation rare earth permanent-magnetic material middle rare earth permanent magnet alloy powder of the present invention should be distributed between the 10-200 μ m.Epoxy resin is as binding agent.Polyvinyl butyral resin (PVB), silane coupler (KH), epoxy polyester lacquer (EIV) are market and sell, and are as the insulation additive in material of the present invention.Further feature of the present invention is: this rare earth permanent magnet alloy powder end can be the permanent magnetism powder of SmCo system.It also can be the permanent magnetism powder of Nd-Fe-B series.In the composition of this insulation rare earth permanent-magnetic material, the addition of epoxy resin can also be 2-6%.The addition of epoxy polyester lacquer can also be 3-8%.The contract addition of butyl ester of polyvinyl alcohol can also be 3-8%.The addition of silane coupler can also be 3-6%.Could guarantee that like this this material has good insulation performance.In insulation rare earth permanent-magnetic material of the present invention, the rare earth alloy permanent-magnet powder can be that SmCo is a permanent-magnet powder, for example, and SmCo
5, Sm
2Co
17Deng alloy powder, also can be NdFeB coefficient permanent magnetic alloy powder.The granularity of permanent magnetic alloy powder depends on the composition of permanent magnetic alloy powder.So the granularity at rare earth permanent magnet alloy powder end is decided to be 10-200 μ m.In the composition of rare earth permanent-magnetic material was insulated in the present invention, epoxy resin mainly was to use as binding agent, though PVB, KH and EIV also have some adhesive effects, we are as the use of insulation additive with these materials (component).In the composition of material of the present invention, mixes when forming magnet with the rare earth permanent magnet alloy powder end again after epoxy resin and the PVB combination, not only play outside bonding and the certain insulation effect, also can improve the adherence when synthesizing the bulk magnet and the impact resistance of magnetic patch.The surface at rare earth permanent magnet alloy powder end all belongs to hydrophilic material, and above-mentioned epoxy resin and PVB all belong to lipophilicity substance, the adding of silane coupler KH component is the effect of playing the coupling activation, improved the cohesive force of rare earth permanent magnet alloy powder end with binding agent, improve the dispersiveness of magnetic in epoxy resin, make rare-earth permanent magnet have the favorable mechanical performance, still have insulation effect simultaneously.Also oxygen polyester lacquer EIU is the present invention's main insulation additive in the rare earth permanent-magnetic material composition that insulate, and it is few that it has a component volatile matter, can make Magnaglo breakdown field intensity height, also has certain adhesive effect simultaneously, can make the rare-earth permanent magnet integral insulation good.More than be to the present invention's being described in detail of rare earth permanent-magnetic material composition of insulating, promptly each individual particle magnetic all is surrounded by insulation additive and binding agent, has briquetting process that it is pressed into needed global shape again.Its preparation technology at first prepares rare earth permanent-magnet powder and epoxy adhesive on request, a kind of with set amount again, also can two or more insulation additive put into together molten device fully soak into and mix after carry out drying, be pressed into the rare earth permanent magnet insulating magnet of required form at last by common bonded permanent magnet pressing process.
The present invention is insulated rare earth permanent-magnetic material compared with prior art, having this insulating magnet of working as is used in the alternating magnetic field environment of upper frequency, magnet itself can not generate heat or generate heat minimum, the magnetic property that can guarantee magnet is not suffered a loss like this, this magnet does not exist because of misoperation or surface fracture produce yet and destroys the insulation phenomenon, these characteristics are crucial to the user and the designer of insulation permanent magnet, also be plating insulating barrier in the prior art magnet the characteristic that can not obtain.
Embodiment
The composition scope of insulation rare earth permanent-magnetic material designed according to this invention, we have done the contrast test of two groups of different rare earth permanent-magnet powders, first group is that SmCo is the permanent magnetism powder, and (sequence number is 1,2,3,4,5 in the table) second group is that Nd-Fe-B is a permanent-magnet powder, (sequence number is 6,7,8 in the table).Process of the test is by the proportioning among the embodiment, earlier with binding agent and insulation additive, mix the back with SmCo system or (HDDR) Nd-Fe-B rare earth permanent magnet alloy powder end put into molten device and fully stir, treat the abundant and complete volatile dry of solvent of infiltration after, make needed powder again.To mix back SmCo system insulation magnetic orientation moulding in magnetic field then and become magnet assembly.Nd-Fe-B system insulation magnetic is molded into magnet assembly under no magnetic field.At last with magnet assembly at 150 ℃, solidified 2 hours.
Contrast test sequence number in table is that (9,10) are that SmC0 and Nd-Fe-B permanent magnetic alloy powder are mixed with 4% epoxide resin, is pressed into identical magnet assembly respectively with the foregoing description method again and compares.
The explanation of embodiment contrast table: table 1 is the composition contrast of insulation rare earth permanent-magnetic material and prior art.Table 2 is the performance comparison of material of the present invention and prior art.1,2,3,4,5,6,7,8 are the present invention's rare earth permanent-magnetic material that insulate in table, and 9,10 is contrast material.
The proportioning components of table 1 insulation rare earth permanent-magnetic material
| The material sequence number | Rare earth permanent magnet alloy powder | Epoxy resin Wt% | The polyvinyl alcohol butyric acid Wt% that contracts | Silane coupler Wt% | Epoxy polyester paint Wt% | |||
| Alloy | Distribution of particles μ m | Shaped state | Wt ％ | |||||
| 1 | ?SmCO 5 | ?10-60 | Orientation | 82 | ?5 | ?5 | ?0 | ?8 |
| ?2 | ?SmCO 17 | ?40-120 | Orientation | 91 | ?3 | ?0 | ?3 | ?3 |
| ?3 | ?SmCO 17 | ?40-120 | Orientation | 84 | ?4 | ?3 | ?4 | ?5 |
| ?4 | ?SmCO 17 | ?40-120 | Orientation | 70 | ?5 | ?9 | ?6 | ?10 |
| ?5 | ?SmCO 17 | ?40-120 | Orientation | 65 | ?9 | ?10 | ?6 | ?10 |
| ?6 | ?Nd-Fe-B ??(HDDR) | ?100-200 | There is not orientation | 93 | ?2 | ?0 | ?0 | ?5 |
| ?7 | ?Nd-Fe-B ??(HDDR) | ?100-200 | There is not orientation | 88 | ?4 | ?3 | ?0 | ?5 |
| ?8 | ?Nd-Fe-B ?(HDDR) | ?100-200 | There is not orientation | 77 | ?5 | ?8 | ?3 | ?7 |
| ?9 | ?SmCO 5 | ?40-120 | Orientation | 96 | ?4 | ?0 | ?0 | ?0 |
| ?1?0 | ?Nd-Fe-B ??(HDDR) | ?100-200 | There is not orientation | 96 | ?4 | ?0 | ?0 | ?0 |
The performance of table 2 insulation rare earth permanent-magnetic material
| The performance sequence number | ?Br (KG) | ??Hc ?(KOe) | ?(BH)max ?(MGOe) | Specific insulation Ω-Cm |
| ?1 | ?5.4 | ?11.0 | ?5.9 | ?2×10 6 |
| ?2 | ?7.1 | ?15.0 | ?11.0 | ?2×10 3 |
| ?3 | ?6.7 | ?14.4 | ?8.9 | ?1×10 5 |
| ?4 | ?5.7 | ?14.0 | ?6.5 | ?1×10 7 |
| ?5 | ?4.2 | ?13.8 | ?4.0 | ?1×10 9 |
| ?6 | ?5.5 | ?12.0 | ?6.5 | ?1×10 4 |
| ?7 | ?4.8 | ?11.6 | ?5.0 | ?1×10 5 |
| ?8 | ?4?2 | ?11.4 | ?4.0 | ?1×10 7 |
| ?9 | ?7.7 | ?15.0 | ?12.5 | ?0.9 |
| ?10 | ?6.3 | ?12.0 | ?8.5 | ?1.4 |
Claims (7)
1, a kind of rare earth permanent-magnetic material with insulating properties is base with the rare earth permanent magnet alloy powder, and contains binding agent and insulation additive, and it is characterized in that forming the insulate composition of rare earth permanent-magnetic material is that (weight %) epoxy resin is 1-10%; The epoxy polyester lacquer is 0.5-10%, and polyvinyl butyral resin is 0-10%; Silane coupler is 0-8%, and all the other are rare earth permanent magnet alloy powder.
2,, it is characterized in that this rare earth permanent magnet alloy powder can be the permanent magnetism powder of SmCo system according to the composition of the described insulation rare earth permanent-magnetic material of claim 1.
3,, it is characterized in that this rare earth permanent magnet alloy powder end also can be the permanent magnetism powder of Nd-Fe-B series according to the composition of the described insulation rare earth permanent-magnetic material of claim 1.
4,, it is characterized in that the addition of epoxy resin can also be (weight %) 2-6% according to the composition of the described insulation rare earth permanent-magnetic material of claim 1.
5,, it is characterized in that the addition of epoxy polyester lacquer can also be (weight %) 3-8% according to the composition of the described insulation rare earth permanent-magnetic material of claim 1.
6,, it is characterized in that the contract addition of butyl ester of polyvinyl alcohol can also be (weight %) 3-8% according to the composition of the described insulation rare earth permanent-magnetic material of claim 1.
7,, it is characterized in that the addition of silane coupler can also be (weight %) 3-6% according to the composition of the described insulation rare earth permanent-magnetic material of claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121777A CN1048350C (en) | 1997-12-19 | 1997-12-19 | Rare-earth permanet magnet material with insulation performance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97121777A CN1048350C (en) | 1997-12-19 | 1997-12-19 | Rare-earth permanet magnet material with insulation performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1185009A true CN1185009A (en) | 1998-06-17 |
| CN1048350C CN1048350C (en) | 2000-01-12 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN97121777A Expired - Fee Related CN1048350C (en) | 1997-12-19 | 1997-12-19 | Rare-earth permanet magnet material with insulation performance |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740193B (en) * | 2009-12-31 | 2011-11-30 | 中国船舶重工集团公司第七二五研究所 | Rare-earth permanent magnet with high magnetic performance and high electric resistance and preparation method thereof |
| CN102592768A (en) * | 2012-01-12 | 2012-07-18 | 安徽省庐江县万和磁材加工有限公司 | Method for preparing high-strength injection-molded strong-magnetic powder/ polyamide composite materials |
| CN106849390A (en) * | 2017-04-13 | 2017-06-13 | 浙江贝德泵业有限公司 | A kind of air conditioning pump with permagnetic synchronous motor |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08279407A (en) * | 1995-02-07 | 1996-10-22 | Sumitomo Special Metals Co Ltd | R-fe-b permanent magnet being excellent in electrical insulating properties, heat resistance and corrosion resistance and manufacture thereof |
-
1997
- 1997-12-19 CN CN97121777A patent/CN1048350C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101740193B (en) * | 2009-12-31 | 2011-11-30 | 中国船舶重工集团公司第七二五研究所 | Rare-earth permanent magnet with high magnetic performance and high electric resistance and preparation method thereof |
| CN102592768A (en) * | 2012-01-12 | 2012-07-18 | 安徽省庐江县万和磁材加工有限公司 | Method for preparing high-strength injection-molded strong-magnetic powder/ polyamide composite materials |
| CN102592768B (en) * | 2012-01-12 | 2014-12-17 | 安徽省庐江县万和磁材加工有限公司 | Method for preparing high-strength injection-molded strong-magnetic powder/ polyamide composite materials |
| CN106849390A (en) * | 2017-04-13 | 2017-06-13 | 浙江贝德泵业有限公司 | A kind of air conditioning pump with permagnetic synchronous motor |
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| Publication number | Publication date |
|---|---|
| CN1048350C (en) | 2000-01-12 |
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