CN103928205A - Neodymium iron boron-ferrite permanent magnet and preparation method thereof - Google Patents
Neodymium iron boron-ferrite permanent magnet and preparation method thereof Download PDFInfo
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- CN103928205A CN103928205A CN201410142499.XA CN201410142499A CN103928205A CN 103928205 A CN103928205 A CN 103928205A CN 201410142499 A CN201410142499 A CN 201410142499A CN 103928205 A CN103928205 A CN 103928205A
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Abstract
The invention discloses a neodymium iron boron-ferrite permanent magnet and a preparation method thereof. The neodymium iron boron-ferrite permanent magnet comprises neodymium iron boron magnetic powder, ferrite magnetic powder, a titanate coupling agent, rubber and epoxy resin. The preparation method includes (1), placing the neodymium iron boron magnetic powder, the ferrite magnetic powder and the titanate coupling agent in a ball mill according to a proportion for ball milling; (2), adding the rubber and the epoxy resin in slurry after ball milling, sufficiently stirring for uniform mixing, and obtaining mixture powder through spray granulation; (3), subjecting the mixture powder to blank forming; (4), sintering, namely sintering a green blank in oxygen-enriched conditions, and naturally cooling to obtain the neodymium iron boron-ferrite permanent magnet. The nneodymium iron boron-ferrite permanent magnet is reasonable in formula and simple in preparation method, and a neodymium iron boron material and a ferrite material are composited, so that comprehensive magnetic performance of the permanent magnet is improved; manufacturing cost is lowered, and the prepared permanent magnet is good in performance, high in performance-cost ratio and capable of meeting requirements of more places.
Description
Technical field:
The present invention relates to a kind of neodymium iron boron-ferrite permanent magnet and preparation method thereof, belong to field of magnetic material.
Background technology:
Neodymium-iron-boron magnetic material, because its excellent magnetic property is called as " magnetic king ".Neodymium-iron-boron magnetic material is neodymium, the alloy of iron oxide etc.Claim again magnet steel.Neodymium iron boron has high magnetic energy product and strong power, the advantage of high-energy-density is applied widely Nd-Fe-Bo permanent magnet material in modern industry and electronic technology simultaneously, thereby makes miniaturization, lightweight, the slimming of the equipment such as instrument and meter, electroacoustic motor, magnetic separation magnetization become possibility.The advantage of neodymium iron boron is that cost performance is high, the mechanical property that tool is good; Weak point is that Curie point is low, and temperature characterisitic is poor, and is easy to efflorescence corrosion, must, by adjusting its chemical composition and taking surface treatment method to make it to be improved, just can reach the requirement of practical application.
Ferrite is that one has ferromagnetic metal oxide.With regard to electrical characteristics, ferritic resistivity is more much bigger than metal, alloy magnetic material, and also has higher dielectric property.Ferritic magnetic property has higher magnetic permeability while also showing high frequency.Thereby ferrite has become the broad-spectrum nonmetal magnetic material in high frequency light current field.Because the magnetic energy storing in ferrite unit volume is lower, full close also lower (conventionally only have pure iron 1/3～1/5) of the magnetization, thereby limited it in the low frequency forceful electric power of the magnetic energy density of having relatively high expectations and the application in high-power field.
Manufacture in the method for bonding type Nd-Fe-B magnetic material at present, NdFeB magnetic powder is easily oxidized; And the refining temperature height in existing technique has also been accelerated the oxidation of NdFeB magnetic powder, and oxidation can be unfavorable for the control of the magnetic characteristic of bonding type Nd-Fe-B magnetic material.For head it off, someone proposes to add antioxidant, also someone proposes to prevent its oxidation with coupling agent dipping NdFeB magnetic powder, but these methods all fail to solve completely problem of oxidation, as coupling agent cannot form the effect of thorough impregnation, can not form uniform overlay and cause oxidation-protective effect not good.
Summary of the invention:
The present invention seeks to, be used for making up the deficiencies in the prior art, and a kind of neodymium iron boron-ferrite permanent magnet and preparation method thereof is provided.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of neodymium iron boron-ferrite permanent magnet, in parts by weight, comprises NdFeB magnetic powder 30-40 part, ferromagnetic oxide powder 45-60 part, titanate coupling agent 1-3 part, rubber 2-4 part and epoxy resin 2-4 part; Wherein the mass ratio of NdFeB magnetic powder and ferromagnetic oxide powder is 2: 3.
Described a kind of neodymium iron boron-ferrite permanent magnet, in parts by weight, comprises 2 parts of 30 parts of NdFeB magnetic powders, 45 parts of ferromagnetic oxide powders, 1 part of titanate coupling agent, 2 parts of rubber and epoxy resin.
Described a kind of neodymium iron boron-ferrite permanent magnet, in parts by weight, comprises 4 parts of 40 parts of NdFeB magnetic powders, 60 parts of ferromagnetic oxide powders, 3 parts of titanate coupling agents, 4 parts of rubber and epoxy resin.
Described a kind of neodymium iron boron-ferrite permanent magnet, ferromagnetic oxide powder is one or more in strontium ferrite, barium ferrite, lead ferrite and barium ferrite magnetic.
The preparation method of described a kind of neodymium iron boron-ferrite permanent magnet, comprises following step:
(1) NdFeB magnetic powder, ferromagnetic oxide powder and titanate coupling agent are placed in to ball mill together with proportionally, add water and steel ball to carry out ball mill crushing and mixing;
(2) in the slurry after ball milling, add rubber and epoxy resin, be fully uniformly mixed, mixing time is 40-60min, obtains compound powder by mist projection granulating;
(3) mixed material is 11-12MPa at pressure condition, and temperature is 30-50 DEG C, under the condition that magnetic field is 8500-9000Gs, obtains green compact;
(4) sintering: green compact are carried out under excess oxygen to sintering, temperature is 900-1100 DEG C, keeps 1-2h, and cooling obtains neodymium iron boron-ferrite permanent magnet naturally subsequently;
The preparation method of described a kind of neodymium iron boron-ferrite permanent magnet, when ball milling, the mass ratio of material, water and ball is 1: 2: 4.
The preparation method of described a kind of neodymium iron boron-ferrite permanent magnet, spray condition is 300 DEG C of inlet temperatures, and outlet temperature is 100 DEG C, and feed pressure is 1.3MPa.
Beneficial effect of the present invention is as follows:
The present invention fills a prescription rationally, and preparation method is simple, by compound to NdFeB material and Ferrite Material, has improved the comprehensive magnetic energy of permanent magnet, has reduced again manufacturing cost simultaneously, and the permanent magnet performance preparing is good, and cost performance is high, can meet more occasion.
Embodiment:
For technological means, creation characteristic that the present invention is realized, reach object and effect is easy to understand, below in conjunction with specific embodiment, further set forth the present invention.
Embodiment 1:
In the present embodiment, a kind of neodymium iron boron-ferrite permanent magnet, in parts by weight, comprises 2 parts of 30 parts of NdFeB magnetic powders, 45 parts of strontium ferrite magnetic powders, 1 part of titanate coupling agent, 2 parts of rubber and epoxy resin.
The preparation method of described a kind of neodymium iron boron-ferrite permanent magnet, comprises following step:
(1) NdFeB magnetic powder, ferromagnetic oxide powder and titanate coupling agent are placed in to ball mill together with proportionally, add water and steel ball to carry out ball mill crushing and mixing, wherein the mass ratio of material, water and ball is 1: 2: 4;
(2) in the slurry after ball milling, add rubber and epoxy resin, be fully uniformly mixed, mixing time is 40min, obtain compound powder by mist projection granulating, spray condition is 300 DEG C of inlet temperatures, and outlet temperature is 100 DEG C, and feed pressure is 1.3MPa;
(3) mixed material is 12MPa at pressure condition, and temperature is 30 DEG C, under the condition that magnetic field is 9000Gs, obtains green compact;
(4) sintering: green compact are carried out under excess oxygen to sintering, temperature is 1100 DEG C, keeps 1h, and cooling obtains neodymium iron boron-ferrite permanent magnet naturally subsequently.
Embodiment 2:
In this enforcement, a kind of neodymium iron boron-ferrite permanent magnet, in parts by weight, comprises 4 parts of 40 parts of NdFeB magnetic powders, lead ferrite and 60 parts of barium ferrite mixing magnetics, 3 parts of titanate coupling agents, 4 parts of rubber and epoxy resin.
The preparation method of described a kind of neodymium iron boron-ferrite permanent magnet, comprises following step:
(1) NdFeB magnetic powder, ferromagnetic oxide powder and titanate coupling agent are placed in to ball mill together with proportionally, add water and steel ball to carry out ball mill crushing and mixing, wherein the mass ratio of material, water and ball is 1: 2: 4;
(2) in the slurry after ball milling, add rubber and epoxy resin, be fully uniformly mixed, mixing time is 60min, obtain compound powder by mist projection granulating, spray condition is 300 DEG C of inlet temperatures, and outlet temperature is 100 DEG C, and feed pressure is 1.3MPa;
(3) mixed material is 11MPa at pressure condition, and temperature is 50 DEG C, under the condition that magnetic field is 8500Gs, obtains green compact;
(4) sintering: green compact are carried out under excess oxygen to sintering, temperature is 900 DEG C, keeps 2h, and cooling obtains neodymium iron boron-ferrite permanent magnet naturally subsequently;
More than show and described general principle of the present invention and principal character and advantage of the present invention.The technical staff of the industry should understand; the present invention is not restricted to the described embodiments; that in above-described embodiment and specification, describes just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.The claimed scope of the present invention is defined by appending claims and equivalent thereof.
Claims (7)
1. neodymium iron boron-ferrite permanent magnet, is characterized in that, in parts by weight, comprises 30040 parts of NdFeB magnetic powders, ferromagnetic oxide powder 45-60 part, titanate coupling agent 1-3 part, rubber 2-4 part and epoxy resin 2-4 part; Wherein the mass ratio of NdFeB magnetic powder and ferromagnetic oxide powder is 2: 3.
2. a kind of neodymium iron boron-ferrite permanent magnet according to claim 1, is characterized in that, in parts by weight, comprises 2 parts of 30 parts of NdFeB magnetic powders, 45 parts of ferromagnetic oxide powders, 1 part of titanate coupling agent, 2 parts of rubber and epoxy resin.
3. a kind of neodymium iron boron-ferrite permanent magnet according to claim 1, is characterized in that, in parts by weight, comprises 4 parts of 40 parts of NdFeB magnetic powders, 60 parts of ferromagnetic oxide powders, 3 parts of titanate coupling agents, 4 parts of rubber and epoxy resin.
4. according to a kind of neodymium iron boron-ferrite permanent magnet described in claims 1 to 3 any one, it is characterized in that, ferromagnetic oxide powder is one or more in strontium ferrite, barium ferrite, lead ferrite and barium ferrite magnetic.
5. the preparation method of a kind of neodymium iron boron-ferrite permanent magnet according to claim 1, is characterized in that, comprises following step:
(1) NdFeB magnetic powder, ferromagnetic oxide powder and titanate coupling agent are placed in to ball mill together with proportionally, add water and steel ball to carry out ball mill crushing and mixing;
(2) in the slurry after ball milling, add rubber and epoxy resin, be fully uniformly mixed, mixing time is 40-60min, obtains compound powder by mist projection granulating;
(3) mixed material is 11-12MPa at pressure condition, and temperature is 30-50 DEG C, under the condition that magnetic field is 8500-9000Gs, obtains green compact;
(4) sintering: green compact are carried out under excess oxygen to sintering, temperature is 900-1100 DEG C, keeps 1-2h, and cooling obtains neodymium iron boron-ferrite permanent magnet naturally subsequently;
6. the preparation method of a kind of neodymium iron boron-ferrite permanent magnet according to claim 5, is characterized in that, when ball milling, the mass ratio of material, water and ball is 1: 2: 4.
7. the preparation method of a kind of neodymium iron boron-ferrite permanent magnet according to claim 5, is characterized in that, spray condition is 300 DEG C of inlet temperatures, and outlet temperature is 100 DEG C, and feed pressure is 1.3MPa.
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| CN106816250A (en) * | 2017-03-08 | 2017-06-09 | 安徽省东方磁磁铁制造有限公司 | A kind of high-temperature-resistant and anti-corrosion Nd-Fe-B permanent magnet and preparation method thereof |
| CN107540902A (en) * | 2017-09-13 | 2018-01-05 | 扬州大学 | A kind of preparation method of flexible neodymium iron boron rubber magnet composite |
| CN108568522A (en) * | 2018-04-27 | 2018-09-25 | 安徽省瀚海新材料股份有限公司 | A kind of method neodymium iron boron superfine powder recycling and efficiently utilized |
| CN108831661A (en) * | 2017-02-21 | 2018-11-16 | 济南大学 | A kind of preparation method of the composite magnetic particle based on neodymium iron boron |
| CN108847326A (en) * | 2018-06-29 | 2018-11-20 | 江苏新旭磁电科技有限公司 | A kind of high-performance permanent-magnet ferrite product and preparation method thereof |
| CN117690682A (en) * | 2023-12-19 | 2024-03-12 | 东莞金坤新材料股份有限公司 | Ferrite neodymium-iron-boron mixed magnet and preparation method thereof |
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| CN108831661A (en) * | 2017-02-21 | 2018-11-16 | 济南大学 | A kind of preparation method of the composite magnetic particle based on neodymium iron boron |
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| CN108847326A (en) * | 2018-06-29 | 2018-11-20 | 江苏新旭磁电科技有限公司 | A kind of high-performance permanent-magnet ferrite product and preparation method thereof |
| CN117690682A (en) * | 2023-12-19 | 2024-03-12 | 东莞金坤新材料股份有限公司 | Ferrite neodymium-iron-boron mixed magnet and preparation method thereof |
| CN117690682B (en) * | 2023-12-19 | 2024-09-20 | 东莞金坤新材料股份有限公司 | Ferrite neodymium-iron-boron mixed magnet and preparation method thereof |
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Application publication date: 20140716 |