CN2809793Y - Rare earth magnet for harddisk driver - Google Patents
Rare earth magnet for harddisk driver Download PDFInfo
- Publication number
- CN2809793Y CN2809793Y CN 200520043347 CN200520043347U CN2809793Y CN 2809793 Y CN2809793 Y CN 2809793Y CN 200520043347 CN200520043347 CN 200520043347 CN 200520043347 U CN200520043347 U CN 200520043347U CN 2809793 Y CN2809793 Y CN 2809793Y
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- hard disk
- rare earth
- magnet
- earth magnet
- annulus
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Abstract
The utility model designs a rare earth magnet for a hard disk driver, which comprises an annular magnet. The utility model is characterized in that the utility model also comprises a corrosion resistant layer which is coated on the surface of the annular magnet. Because a layer of high molecular polymer is coated on the surface of the rare earth magnet for a hard disk driver of the utility model, the utility model has stronger corrosion resistance. The magnet is detected by the public GB/T18880 method, the coated rare earth magnet for a hard disk driver has the advantages of good moist and heat resistance, good solvent resistance and no corrosion and can satisfy the need of related aspects.
Description
Technical field
The utility model relates to a kind of hard disk drive rare earth magnet, and particularly a kind of surface has the hard disk drive rare earth magnet of anticorrosive protective seam.
Background technology
Hard disk driver magnet is one of part of hard disk drive most critical, and the quality of its performance has directly determined the quality of hard disk drive.At present, the material of hard disk driver magnet is selected bonding rare earth magnet for use or is contained in the bonded permanent magnet of rare earth element and adds ferromagnetic oxide powder, aluminium-nickel-cobalt magnetic powder, metallic element powder etc., or other magnetic material.Document J.J.Croat, (AMM company), Luo Yang, " rare earth magnet is as the present situation and the prediction of bonding NdFeB magnet industry " of director's IEEETC-15 writing; Japan bonded permanent magnet industry association farmland on a plateau English timbo well wins own " today of bonded permanent magnet and tomorrow "; Bi Chao, Zheng Guangde, the Zhang Xinyu Singapore data storage research institute opportunities and challenges of development-permanent magnetic material of device " hard disk tend to act "; Sevi Gaiffi, the disclosed technology of the bright MQI of horse bezoar " the manufacture craft performance and the economic target of NdFeB bonded permanent magnet ", the bonding rare earth magnet material is divided into Agglutinate neodymium-iron-boron, rare earth ferroalloy nitride, (SmCo is meant Sm to the bonding SmCo
2Co
17Or SmCo
5), the compound of wherein one or more.
The disclosed technology of above-mentioned patent and document; the surface of its hard disk driver magnet does not all have protective seam, therefore, and when in hard disk drive has the environment of Korrosionsmedium, using; might cause the hard disk drive serviceability to descend, finally influence the operate as normal of computing machine.
Therefore,, make the hard disk driver magnet can either operate as normal, can resist the erosion of extraneous Korrosionsmedium again how at the surface coverage layer protective layer of hard disk driver magnet, be relevant department very expectation.
Summary of the invention
The utility model technical issues that need to address are to disclose a kind of hard disk drive rare earth magnet, to overcome the above-mentioned defective that prior art exists, satisfy the needs of the parties concerned;
Hard disk drive rare earth magnet of the present utility model comprises circular magnet, it is characterized in that, also comprises the etch resistant layer that is coated in circular magnet surface.
Since hard disk drive rare earth magnet surface-coated of the present utility model one deck high molecular polymer, therefore, has stronger corrosion resistivity, adopt GB/T 18880 disclosed test methods, it is detected, the humidity resistance and the solvent resistance of the hard disk driver magnet after the coating are good, do not corrode, and can satisfy the needs of the parties concerned.
Description of drawings
Fig. 1 is the hard disk driver magnet structural representation.
Fig. 2 is that the A---A of Fig. 1 is to synoptic diagram.
Embodiment
Referring to Fig. 1 and Fig. 2, hard disk drive rare earth magnet of the present utility model comprises circular magnet 1, it is characterized in that, also comprises the etch resistant layer 2 that is coated in circular magnet 1 surface.
Hard disk driver magnet shape, size and magnetic property are identical with conventional technology, its relative dimensions:
The outer diameter D of annulus is 35～4mm, preferred 28mm;
The inner diameter d of annulus is 33～2mm, preferred 26mm;
The height H of annulus is 0.5-6mm, preferred 4.5mm;
The circularity of the external diameter of annulus is less than 0.03mm, and right alignment is less than 0.03mm, and the circularity of the internal diameter of annulus is less than 0.03mm.
The magnetic property of hard disk driver magnet:
Maximum magnetic energy product (BH) max:56-400kJ/m
3
The magnetic magnetic pole number of poles of magnet is 2 n times, n=1-128;
The material of hard disk driver magnet selects bonding rare earth magnet for use, contain the potpourri of the bonded permanent magnet of rare earth element and ferromagnetic oxide powder, aluminium-nickel-cobalt magnetic powder or metallic element powder etc. or other magnetic materials, sintering rare-earth class magnet;
Bonding rare earth magnet is selected for use as Agglutinate neodymium-iron-boron, bonding neodymium iron nitrogen, (SmCo is meant Sm to the bonding SmCo
2Co
17Or SmCo
5); Sintering rare-earth class magnet is selected sintered NdFeB, sintering neodymium iron nitrogen, neodymium iron boron for use, (SmCo is meant Sm to sintered samarium cobalt
2Co
17Or SmCo
5);
The material of said etch resistant layer is a high molecular polymer;
Preferred high molecular polymer is selected from a kind of or its potpourri in epoxy resin, poly-fluororesin, linear phenolic resin or the aldehyde ketone resin, and the thickness of corrosion-resistant material layer is 2-30 μ m;
The preparation method of hard disk drive rare earth magnet of the present utility model comprises the steps:
The first step: permanent magnetic powder and compound binding agent are mixed with, the percentage by weight of mixing, permanent magnetic powder 58～99.5%, compound binding agent 0.5～42%, evenly mix at normal temperatures and pressures, make the mixture powder of permanent magnetic powder and compound binding agent, size 2～500 μ of mixture powder;
Compound binding agent is selected from one or more in phenolics, epoxy resin, liquid crystalline resin, polyamide (nylon), polyphenylene sulfide, the fluorine resin.
Second step: the shaping of hard disk driver magnet: at normal temperature and pressure is 2～20 tons/centimetre
2Condition under compression moulding, solidified 1～120 minute down at 80～230 ℃ again, make a kind of hard disk driver magnet.
The 3rd step: high molecular polymer is dissolved in organic solvent, and in the solvent, the mass concentration of Molecularly Imprinted Polymer is 20～80%, adopts spraying or electrophoresis in the hard disk driver magnet surface, and oven dry or air dry get final product under 10～260 ℃ temperature then.
Said organic solvent is selected from a kind of in acetone, n-butanols, ethyl acetate or the paraldehyde.
Claims (5)
1. a hard disk drive rare earth magnet is characterized in that, comprises circular magnet (1), it is characterized in that, also comprises the etch resistant layer (2) that is coated in circular magnet (1) surface.
2. hard disk driver magnet according to claim 1 is characterized in that:
The outer diameter D of annulus is 35～4mm;
The inner diameter d of annulus is 33～2mm;
The height H of annulus is 0.5-6mm;
The circularity of the external diameter of annulus is less than 0.03mm, and right alignment is less than 0.03mm;
The circularity of the internal diameter of annulus is less than 0.03mm.
3. hard disk drive rare earth magnet according to claim 1 is characterized in that:
The outer diameter D of annulus is 28mm;
The inner diameter d of annulus is 26mm;
The height H of annulus is 4.5mm.
4. hard disk drive rare earth magnet according to claim 1 is characterized in that, the material of said etch resistant layer (2) is a high molecular polymer.
5. hard disk drive rare earth magnet according to claim 1 is characterized in that, the thickness of corrosion-resistant material layer is 2-30 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520043347 CN2809793Y (en) | 2005-07-12 | 2005-07-12 | Rare earth magnet for harddisk driver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520043347 CN2809793Y (en) | 2005-07-12 | 2005-07-12 | Rare earth magnet for harddisk driver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2809793Y true CN2809793Y (en) | 2006-08-23 |
Family
ID=36925978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520043347 Expired - Fee Related CN2809793Y (en) | 2005-07-12 | 2005-07-12 | Rare earth magnet for harddisk driver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2809793Y (en) |
-
2005
- 2005-07-12 CN CN 200520043347 patent/CN2809793Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060823 Termination date: 20100712 |