WO1999023675A1 - AIMANT LIE A BASE DE R-Fe-B EXTREMEMENT RESISTANT A LA CORROSION ET PROCEDE DE FABRICATION DUDIT AIMANT - Google Patents

AIMANT LIE A BASE DE R-Fe-B EXTREMEMENT RESISTANT A LA CORROSION ET PROCEDE DE FABRICATION DUDIT AIMANT Download PDF

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Publication number
WO1999023675A1
WO1999023675A1 PCT/JP1998/004829 JP9804829W WO9923675A1 WO 1999023675 A1 WO1999023675 A1 WO 1999023675A1 JP 9804829 W JP9804829 W JP 9804829W WO 9923675 A1 WO9923675 A1 WO 9923675A1
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WO
WIPO (PCT)
Prior art keywords
magnet
bonded magnet
metal
plating
barrel
Prior art date
Application number
PCT/JP1998/004829
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English (en)
Japanese (ja)
Inventor
Kohshi Yoshimura
Takeshi Nishiuchi
Fumiaki Kikui
Takahiro Isozaki
Original Assignee
Sumitomo Special Metals Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP04455998A external-priority patent/JP3236814B2/ja
Priority claimed from JP04455898A external-priority patent/JP3236813B2/ja
Priority claimed from JP04882898A external-priority patent/JP3236816B2/ja
Priority claimed from JP04882798A external-priority patent/JP3236815B2/ja
Priority claimed from JP10056044A external-priority patent/JPH11238641A/ja
Priority claimed from JP10083012A external-priority patent/JPH11260614A/ja
Priority claimed from JP10083011A external-priority patent/JPH11260613A/ja
Priority claimed from JP10103496A external-priority patent/JPH11283818A/ja
Application filed by Sumitomo Special Metals Co., Ltd. filed Critical Sumitomo Special Metals Co., Ltd.
Priority to EP98950380A priority Critical patent/EP1028437B1/fr
Priority to DE69834567T priority patent/DE69834567T2/de
Publication of WO1999023675A1 publication Critical patent/WO1999023675A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/02—Permanent magnets [PM]
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/56—Electroplating: Baths therefor from solutions of alloys
    • C25D3/562—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of iron or nickel or cobalt
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
    • C25D5/34—Pretreatment of metallic surfaces to be electroplated

Definitions

  • the present invention relates to an R-Fe-B bonded magnet having various shapes, such as a ring shape and a disk shape, having improved corrosion resistance with a metal film having high cleanliness.
  • Polishing dust and inorganic powder are buried in the pores to seal and smooth the surface, or without the above-mentioned sealing treatment, Cu, Sn, Zn, Pb, Cd, In, Au , Ag, Fe, Ni, Co, Cr, Al and its alloy pieces are crushed by dry barrel polishing using a metal media, and the crushed metal flakes are bonded to the resin surface of the bonded magnet surface and the voids or sealing portions.
  • R-Fe-B-based magnets that use R-Fe-B-based magnetic materials that exhibit high magnetic properties with a maximum energy product of 50MGOe or more for sintered magnets High performance has been achieved for bonded magnets.
  • R-Fe-B bonded magnets have a problem that they are prone to cracking due to the fact that they contain a large amount of Fe and a highly oxidizable component phase in the magnet alloy composition, and a resin layer of various compositions is electrodeposited on the surface.
  • a spray method, an immersion method, an impregnation method and the like for example, JP-A-1-66519, JP-A-1-245504.
  • the film thickness is uniform, but it is necessary to attach each of the magnets to an electrode, and repair of the electrode part removed after painting, that is, touch-up is required.
  • touch-up is required.
  • the electric metal plating performed by the sintered R-Fe-B magnet should be applied (Japanese Patent Application Laid-Open Nos. 60-54406 and 62-120003).
  • the plating solution remains or the plating film is sufficiently formed on the resin part. Pinholes (non-plated parts) are generated, and firing occurs.
  • a plating bath with a specific composition has been proposed as a method of applying Ni plating with high film formation efficiency to R-Fe-B-based bonded magnets (Japanese Patent Application Laid-Open No. 4-99192). There is a danger of intrusion and residual fire.
  • Cu strike plating which is usually performed before Ni plating, is either strongly alkaline or strongly acidic, and is unsuitable for processing R-Fe-B based bonded magnets. is there.
  • the conductive coating layer is a resin layer containing a conductive substance or metal powder, and the resin exposed portion of the bonded magnet on the surface is improved as compared with the R-Fe-B based bonded magnet material.
  • it is difficult to obtain a uniform and good conductive surface because there are not a few exposed portions of the coating resin due to the manufacturing method, and there are low conductivity parts on the surface. There are problems such as the tendency to occur.
  • the inventor of the present invention carried out barrel polishing by a dry method using a mixture of a vegetable medium or a surface-modified vegetable medium and an abrasive with the abrasive, as a medium.
  • An object of the present invention is to provide an R-Fe-B bonded magnet having extremely high corrosion resistance, which does not occur even in a long-time high-temperature high-humidity test, and has an extremely high adhesion strength in order to realize high corrosion resistance.
  • An object of the present invention is to provide a manufacturing method capable of uniformly forming various corrosion resistant coatings on an R-Fe-B-based bonded magnet.
  • the present invention provides high adhesion strength and high dimensional accuracy on the magnet surface, which prevents the plating solution and cleaning solution from entering and remaining in the porous R-Fe-B bond magnet in the conventional electroless plating method.
  • the purpose of the present invention is to provide a method for manufacturing a high corrosion-resistant R-Fe-B-based bonded magnet comprising an industrial process most suitable for providing a corrosion-resistant coating.
  • the electroplating technology of R-Fe-B bonded magnets with excellent corrosion resistance and surface cleanliness the inventors have focused on the fact that it is important to impart conductivity to the surface of the material extremely uniformly.
  • the R-Fe-B bonded magnet was converted to a barrel device using irregular shaped Cu pieces of the required dimensions, such as spherical, massive or needle-like (wire), as metal media.
  • irregular shaped Cu pieces of the required dimensions such as spherical, massive or needle-like (wire), as metal media.
  • the crushed Cu fine particles are pressed into the resin surface and pores of the bonded magnet surface and coated, and the magnetic particle surface is also coated with Cu fine particles.
  • porous the R-Fe-B bonded magnet such as A1 2 0 3, SiC
  • a mixture of an abrasive obtained by baking inorganic powder and a vegetable medium such as fruit husk or corn core, or a mixture of the above abrasive and a vegetable medium whose surface has been modified with the inorganic powder And then subjecting it to barrel polishing by a dry process to remove abrasive debris such as abrasive powder, inorganic powder for reforming, and the surface oxide layer of the magnetic powder constituting the bonded magnet, using the oils and fats of the vegetable medium Since it is possible to fix and seal the pores of the magnet and to smooth the surface at the same time, it is possible to form a conductive film directly on the surface of the magnet material after dry barrel polishing. Improved smoothness and resistance It was found that sex can further excellent Rukoto obtain an R-Fe-B
  • the inventors of the present invention have reported that soft metal pieces of Sn, Zn, Pb, Cd, In, Au, and Ag having a Vickers hardness value of 80 or less, , Co, and Cr can be used as media.
  • the inventors used an amorphous A1 piece as a medium, and performed barrel polishing by a dry method using a barrel device, so that the ground A1 pieces were bonded to the surface of the bonded magnet.
  • the surface of the A1 coating layer formed on the surface of the R-Fe-B bonded magnet is zinc-substituted by press-fitting and coating the resin surface and sealing portion of As a result, it is possible to prevent the outflow of A1 at the time of electroplating, to achieve good electroplating, to obtain an R-Fe-B-based bonded magnet plated coating having excellent corrosion resistance and little deterioration in magnetic properties.
  • the high corrosion resistance R-Fe-B-based bonded magnet according to the present invention is:
  • Jihi, 811, 211,? 15, J 111 116,: 1 ⁇ 0, ⁇ 1 and its alloys are press-fitted and coated with metal particles, and the surface of magnetic powder is coated with metal particles to form metal on the surface of the magnet. It is characterized by having a coating layer and an electrolytic plating layer formed via the metal coating layer.
  • the pores forming the surface of the R-Fe-B-based bonded magnet include abrasive powder, polishing debris of the bonded magnet, and inorganic material.
  • the metal particles are pressed into and coated on the resin surface constituting the surface and the sealing portion, and on the magnetic powder surface constituting the surface.
  • the magnet is characterized by having the metal coating layer on the surface of the magnet formed by coating metal particles and an electrolytic plating layer formed via the metal coating layer.
  • the R-Fe-B bonded magnet having high corrosion resistance according to the present invention is characterized in that A1 fine particles are press-fitted and coated on the resin surface constituting the surface and the sealing portion, and A1 fine particles are adhered on the magnetic powder surface constituting the surface.
  • R-Fe-B bonded magnets are intended for both isotropic and anisotropic bonded magnets.
  • thermosetting of magnetic powder having the required composition and properties It is obtained by adding and kneading a curable resin, a coupling agent, lubrication, etc., then compressing and heating to cure the resin.
  • a thermoplastic resin is added to the magnetic powder. It is obtained by adding and kneading a coupling agent, lubrication, etc., and then molding by any of injection molding, extrusion molding, and rolling molding.
  • the R-Fe-B-based magnetic material powder is prepared by dissolving the required R-Fe-B-based alloy and pulverizing it after production. Melting R-Fe-B alloy using a jet caster to obtain ribbon foil and pulverizing and annealing it, quenching alloy, dissolving required R-Fe-B alloy, pulverizing it by gas atomization and heat-treating Gas atomization method, powdering the required raw material metal, pulverizing it by mechanical alloying and heat-treating it.
  • Mechanismanical alloying method and heating and decomposing and recrystallizing the required R-Fe-B alloy in hydrogen Isotropic and anisotropic powders obtained by various production methods such as a method for making the particles (HDDR method) can be used.
  • the rare earth element R used in the R-Fe-B-based magnet powder occupies 10 to 30 atomic% of the composition, but at least one of Nd, Pr, Dy, Ho, and Tb, or , 1 ⁇ , 06, 8111, & (1 1 ⁇ 11,13 ⁇ 41, ⁇ 1) and 1 ⁇ 1, ⁇ are preferable.
  • one kind of R is sufficient, but in practice, a mixture of two or more kinds (mish metal, sijim, etc.) can be used for convenience and other reasons.
  • R may not be a pure rare earth element, and may contain impurities that are unavoidable in production as far as it is industrially available.
  • R is an essential element in the above-mentioned system magnet powder, and if it is less than 10 atomic%, the crystal structure becomes a cubic structure having the same structure as a-iron, so that high magnetic properties, particularly high coercive force, cannot be obtained. If it exceeds 30 atomic%, there will be many R-rich non-magnetic phases, and the residual magnetic flux density (Br) will decrease, so that a permanent magnet with excellent characteristics cannot be obtained. Therefore, R is preferably in the range of 10 atomic% to 30 atomic%.
  • B is an essential element in the above-mentioned system magnet powder. If it is less than 2 atomic%, the rhombohedral structure becomes the main phase, a high coercive force (iHc) cannot be obtained, and if it exceeds 28 atomic%, it becomes B-rich. Since there are many non-magnetic phases and the residual magnetic flux density (Br) decreases, an excellent permanent magnet cannot be obtained. Therefore, B is desirably in the range of 2 to 28 atomic%.
  • Fe is an essential element in the above-mentioned system magnet powder, and if it is less than 65 atomic%, the residual magnetic flux density (Br) decreases, and if it exceeds 80 atoms, a high coercive force cannot be obtained. Atomic% is desirable.
  • substituting part of Fe with Co can improve the temperature characteristics without impairing the magnetic properties of the obtained magnet, but conversely when the Co substitution amount exceeds 20% of Fe, It is not preferable because the magnetic properties deteriorate.
  • the substitution amount of Co is 5 atomic% in the total amount of Fe and Co> ⁇ 15 atomic%, (Br) increases as compared with the case where no substitution is made, and thus it is preferable to obtain a high magnetic flux density.
  • B in addition to R, B, Fe, the presence of unavoidable impurities in industrial production can be tolerated.
  • a part of B is 4.0 wt% or less C, 2.0 wt% or less P, 2.0 wt% or less.
  • At least one of Al, Ti, V, Cr, Mn, Bi, Nb, Ta, Mo, W, Sb, Ge, Ga, Sn, Zr, Ni, Si, Zn, and Hf is included in the magnet powder.
  • it can be added because it has the effect of improving the coercive force and the squareness of the demagnetization curve or improving the manufacturability and reducing the price.
  • the upper limit of the addition amount is desirably in a range that satisfies the conditions necessary for setting the (BH) max and (Br) values of the bonded magnet to required values.
  • 6 Pa, 12 Pa, PPS, PBT, EVA, etc. are used as a resin for the injection molding for the binder, and PVC, NBR, CPE, NR, Hibaron, etc. are used for the extrusion molding, the calender roll, the rolling molding, and the compression molding is used.
  • the resin epoxy resin, DAP, phenol resin, etc. can be used, and a known metal binder can be used if necessary.
  • a lubricant for facilitating molding a binder between a resin and an inorganic filler, a silane-based or titanium-based coupling agent, or the like can be used.
  • a polishing material such as A1 2 0 3, inorganic powders baked compacted ceramics such as SiC or a metal ball, plant sexual Kawakuzu, sawdust, fruit shells, such as the core of the corn mixture of vegetable medium, or the abrasive and the A1 2 0 3, SiC at inorganic powder such as surface modified above A mixture of vegetable media is used.
  • a well-known barrel can be used for the sealing and smoothing treatment and the dry barrel polishing for forming the metal coating layer on the surface of the bonded magnet according to the present invention, and a rotating barrel having a general rotation speed of 20 to 50 rpm and a rotation speed of 70 can be used.
  • a centrifugal barrel of ⁇ 200 rpm, a vibration barrel polishing method with a vibration amplitude of 0.5 nmi or more and less than 50 mm can be adopted.
  • the atmosphere of the barrel polishing is usually may be in the air, but by the media has frictional heat in barrels polishing, if an acid I spoon magnet is concerned, N 2, Ar, alone such as He Alternatively, the atmosphere may be an inert gas atmosphere such as a mixed gas thereof.
  • the processing amount is reduced. If it is too small, it is not practical. If it exceeds 90%, stirring is insufficient and sufficient polishing cannot be performed. Therefore, 20% to 90% of the internal volume is preferable.
  • the abrasive in the smoothing process is not particularly limited, the particle diameter l ⁇ 7 mm, preferably 3 ⁇ 5 mm approximately abrasive and diameter 0.5 ⁇ 3 mm, preferably a plant of the order of diameter l ⁇ 2m m
  • the mixture of the magnet and the medium is uniformly stirred, and under the condition that the relative movement is performed. It is preferred to do so.
  • the modified vegetable medium surface at the inorganic powder As the modified vegetable medium surface at the inorganic powder, after the grease, such as wax vegetable medium surface kneaded coatings, particle size 0.01 ⁇ 3 ⁇ A1 2 0 3, SiC, ZrO, MgO inorganic powder uniformly spread on the surface and fixed You.
  • the powder of the abrasive, the inorganic powder for modifying the surface of the vegetable medium, and the swarf of the bonded magnet, which are sealing materials, have a particle size of 0.01 to 3 ⁇ .
  • the ratio of the vegetable medium to the abrasive in the media is 1/5 to 2, and a mixture having a ratio of 1 is preferred. Also, the mixing ratio (bond magnet / media) of the bond magnet and the medium is preferably 3 or less.
  • the abrasive material effectively grinds and removes a surface oxide layer of the magnet, smoothes the surface, and powders of the abrasive material and an inorganic powder for modifying the surface of a vegetable medium, and a bonded magnet.
  • the above-mentioned vegetable medium has an effect of improving the adhesive force of the sealed object by effectively releasing the oil and fat thereof, by tapping and solidifying the sealed object such as abrasive dust.
  • the porosity of the bonded magnet after the surface smoothing treatment can be reduced to 3% or less. Not only the smooth sealing treatment of the bonded magnet surface but also the oxide surface of the magnet is removed to activate the magnet.
  • the surface of the R-Fe-B based magnetic powder can be obtained.
  • a known barrel device such as a rotary type, a vibration type, and a centrifugal type can be used for dry barrel polishing with a metal piece.
  • the shape of the metal piece can be irregular, such as spherical, massive, or needle-like (one wire) . If the size of the metal piece is less than 0.1 mm, it takes a long time to press-fit and coat it practically. However, if it exceeds 10 mm, the surface unevenness becomes large, and the metal cannot be coated on the entire surface.Therefore, the size of the metal piece is preferably 0.1 mm to 10 mm, more preferably 0.3 mm to 5 mm. A more preferred range is 0.5 mm to 3 mm.
  • the metal pieces to be charged into the dry barrel may have the same shape and dimensions, or may mix different shapes and dimensions. Also, fine metal powder may be mixed into the irregular shaped metal piece.
  • the composite metal may be the metal alone or an alloy, or a Cu composite metal in which a different metal such as Fe, Ni, or Al as a core material is coated with Cu. Also, it is desirable that the ratio to be charged for dry barrel polishing and the volume ratio between magnet and metal piece (magnet / metal) is 3 or less. If it exceeds 3, it takes time for press-fitting and coating of metal, which is not practical, and This is because the magnetic particles are shed from the magnet surface.
  • the amount of bonded magnets and metal pieces to be charged into the barrel polishing machine is the amount of bonded magnets and metal pieces to be charged into the barrel polishing machine.
  • the treatment amount is too small to be practical, and if it exceeds 90%, there is a problem that stirring is insufficient and sufficient polishing cannot be performed.
  • the metal flakes to be pressed and coated are fine powder or needle-shaped pieces. If the diameter exceeds 5 ⁇ , the adhesion to the magnet surface is not good, and poor adhesion and peeling during electrolytic plating Therefore, the major diameter was set to 5 ⁇ or less. A preferred range is 2 ⁇ or less in major axis.
  • the metal particles are press-fitted and coated on a resin surface and a hole portion and a magnetic powder surface of a bonded magnet surface, and on a soft resin surface and a hole portion on a bonded magnet surface.
  • the surface of the magnetic powder is coated. The amount press-fitted into the resin surface and the pores increases toward the surface, and the content gradually decreases inside the resin layer.
  • the thickness of the metal press-fit layer on the resin surface and the pores is preferably ⁇ . ⁇ or more and 2 ⁇ or less. If the thickness is less than ⁇ . ⁇ , sufficient conductivity cannot be obtained. No, but time consuming and impractical.
  • the thickness of the metal coating layer on the magnetic powder surface of the bonded magnet surface is preferably 0.2 ⁇ or less, and the reaction between the magnetic powder surface and the metal particles is a kind of mechanochemical reaction.
  • the number of rotations is 20 to 50 rpm for a rotary barrel, 70 to 200 rpm for a centrifugal barrel, and 50 to 50 rpm for a vibration barrel polishing method. : L00 Hz, vibration amplitude 0.3 to 10 mm is preferred.
  • the atmosphere of the barrel polishing method may be in the air, but the irregular shaped metal pieces used as a medium and the ground metal fine pieces and the magnet are used. Friction heat during barrel polishing due to magnetic powder on the surface
  • the atmosphere may be a single gas such as N 2 , Ar, He, or a mixture of gases, etc. Preferred is in an inert gas.
  • the reason why zinc is substituted on the A1 coated surface is to prevent the outflow of A1 at the time of subsequent electric plating.
  • the zinc substitution method is preferably carried out using a solution containing zinc oxide, sodium hydroxide, ferric chloride, rosserile salt, and the like. Processing conditions are preferably immersion with a bath temperature of 10 ° C. to 25 ° C. and a processing time of 10 seconds to 120 seconds.
  • a treatment of washing ⁇ zinc replacement ⁇ washing is preferable. If there is dirt or other deposits on the A1 surface, it is better to immerse and degrease it in a solution of sodium carbonate and sodium triphosphate for cleaning.
  • the formed Zn layer is
  • the thickness of the formed Zn layer is preferably ⁇ . ⁇ or less. If the layer thickness exceeds ⁇ . ⁇ , poor adhesion occurs, which is not preferable.
  • At least one metal selected from Ni, Cu, Sn, Co, Zn, Cr, Ag, Au, Pb, Pt, etc. or an alloy thereof is B, S, P Is preferred, and particularly preferred is Ni plating.
  • the plating thickness is 50 ⁇ or less, preferably 10 to 30 ⁇ .
  • the plating method for the Ni plating bath is preferably performed in the steps of washing ⁇ electrical Ni plating—washing ⁇ drying.
  • Ni plating uses the above-mentioned plating bath, the anode is an electrolytic nickel plate, the required current is applied, and the electric Ni plating is used to stabilize the elution of Ni from the anode Ni plate. It is desirable to use an Estland nickel chip containing
  • the plating method of the Ni plating bath is preferably performed in the steps of washing, electroplating, washing, and drying, and drying is preferably performed at 70 ° C. or more.
  • Various bathtubs can be used for the plating bath according to the shape of the bond magnet. In the case of a ring-shaped bond magnet, trapping plating and barrel plating are preferable.
  • Ndl2at% prepared by the rapid solidification method, Fe77at%, B6at%, and kneaded to an epoxy resin 2 wt% to the alloy powder having an average particle size 150 ⁇ having the composition Co5at%, after compression molding at a pressure of 7 ton / cm 2 Cure at 170 ° C for 1 hour, outer diameter 22mmX inner diameter
  • a ring-shaped bonded magnet of 20 mm ⁇ 3 mm height was produced.
  • the properties of the obtained bonded magnet were Br6.7 kG, iHc8.9 kOe, and (BH) max 9.0 MGOe.
  • the resulting bonded magnet was placed in a vibration barrel, and dry barrel polishing was performed using a short cylindrical Cu piece having a diameter of lmm and a length of lmm to form a conductive coating layer of Cu fine particles.
  • the depth of press-fit coating on the resin surface of the Cu particles is about 0.7 ⁇ , and the coating thickness on the magnetic powder surface is ⁇ . ⁇ .
  • the processing conditions for barrel polishing were as follows: in an atmosphere iiAr gas, in a vibrating barrel with a vibration frequency of 70 Hz and a vibration amplitude of 3 mm, 50 bonded magnets (apparent volume 0.15 weight 100 g) and Cu pieces of the above dimensions (apparent volume) 2Z, weight 10kg), and the total charge was 60% of the barrel inner volume, and the treatment was performed for 3 hours.
  • the film thickness after plating was 20 ⁇ on the inner diameter side and 22 ⁇ on the outer diameter side.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 1 shows the properties of the magnet before and after the moisture resistance test
  • Table 2 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test.
  • the conditions for electric Ni plating were as follows: current density 2 A / dm 2 , plating time 60 minutes, pH 4.2, bath temperature 55 ° C, plating solution composition: 240 g / Z nickel sulfate, 45 g nickel chloride / appropriate nickel carbonate (pH adjustment), and the amount of boric acid was 30 g / rC.
  • the conditions for the electroless copper plating were a plating time of 20 minutes, a pH of 11.5, and a bath temperature of 20 ° C.
  • the composition of the plating solution was 29 g of copper sulfate, 25 g of sodium carbonate / 140 g of tartrate, 40 g of sodium hydroxide, 37% formaldehyde was 150 mrC.
  • Example 2 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 1, a phenol resin and Ni powder were mixed to form a conductive film having a thickness of ⁇ . After the treatment, Ni plating was performed under the same conditions as in Example 1. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Tables 1 to 3 show the results.
  • the conductive film treatment conditions were as follows: treatment time: 30 minutes; treatment liquid composition: 5 wt% of phenol resin, 5 wt% of Ni powder (particle size: 0.7 ⁇ or less), and 90 wt% of MEK (methyl ethyl ketone).
  • Example 2 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 1, forming a phenol resin layer as an adhesive layer in advance by a dipping method, and then attaching Ag powder (particle diameter 0.7 ⁇ or less) to the surface Then, a conductive coating layer having a thickness of 7 ⁇ was formed using a vibration barrel. After the vibration barrel treatment, Ni plating was performed under the same conditions as in Example 1. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. The results are shown in Tables 1 to 3. The vibration barrel processing conditions were as follows: a vibration barrel with a capacity of 3.5 was used, 50 bonded magnets were inserted, and a 2.5 mm steel ball with an apparent volume of 2 was used as a medium for 3 hours.
  • Comparative Example 1 showed spotting after about 100 hours, Comparative Example 2 300 hours later, and Comparative Example 3 also showed about 350 hours later. On the other hand, in Example 1, there were no spots observed under a microscope of 30 times even after 500 hours.
  • Magnetic property degradation rate (%) — -——————- X 100
  • Example 1 No change (no birch) 20 ⁇ 1 Cu coating layer + Ni plating Comparative example 1 After 100 hours ⁇ 25 ⁇ 2 Electroless Cu plating + Ni plating Comparative example 2 After 300 hours Microscopic mackerel 30 ⁇ 10 Conductive resin layer + Ni plating Comparative example 3 Minute after 350 hours ⁇ 27 ⁇ 10 Conductive coating layer + Ni plating
  • Ndl2at% prepared by the rapid solidification method, Fe77at%, B6at%, and kneaded to an epoxy resin 2 wt% to the alloy powder having an average particle size 150 ⁇ having the composition Co5at%, after compression molding at a pressure of 7 ton / cm 2 Cure at 170 ° C for 1 hour, outer diameter 26mm x inner diameter
  • a ring-shaped bonded magnet having a size of 24 mm and a height of 5 mm was produced.
  • the properties of the obtained bonded magnet were Br6.8 kG, iHc9.1 kOe, and (BH) max9.2 MGOe.
  • a bonded magnet was put in a vibrating barrel, and the atmosphere (in iAr gas, using a short cylindrical Cu piece with a diameter of lmm and a length of lmm, a dry barrel with a vibration frequency of 70Mz and a vibration amplitude of 3mm, was polished, Formed conductive coating layer Resin surface of Cu flakes, sealing The indentation depth at the hole was about 0.7 ⁇ , and the coating thickness on the magnetic powder surface was ⁇ . ⁇ .
  • the processing conditions for barrel polishing were as follows: a 3.5 W capacity barrel, 50 bonded magnets (apparent capacity 0.15, weight 100 g) and Cu pieces of the above dimensions (apparent capacity 2kg, weight 10 kg) were charged into the barrel. The charge was 60% of the barrel volume and the treatment was performed for 3 hours at an amplitude of 20 mm.
  • the film thickness after plating was 21 ⁇ on the inner diameter side and 23 ⁇ on the outer diameter side.
  • the resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 800 hours.
  • Table 3 shows the properties of the magnet before and after the moisture resistance test
  • Table 4 shows the surface condition results and the film thickness dimensional accuracy during the humidity resistance test.
  • Ni plating The conditions for electric Ni plating were as follows: current density: 2 A / dm 2 , plating time: 60 minutes, pH: 4.2, bath temperature: 55 ° C; plating solution composition: nickel sulfate 240 g, nickel chloride 45 g / l, nickel carbonate appropriate amount (pH adjustment), the amount of boric acid was 30 g / rt '.
  • the ring-shaped bonded magnet obtained in the same manner as in Example 2 was washed, subjected to the same sealing and surface smoothing treatment as in Example 2, washed, and electroless copper-plated.
  • the plating thickness was 5 ⁇ .
  • Ni plating was performed under the same conditions as in Example 2.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) under the same conditions as in Example 2.
  • the results and film thickness dimensional accuracy (moisture resistance test) were performed. Tables 3 and 4 show the results.
  • the conditions for the electroless copper plating were a plating time of 20 minutes, a pH of 11.5, and a bath temperature of 20 ° C.
  • the composition of the plating solution was 29 gl of copper sulfate, 25 g of sodium carbonate, 140 g of tartrate, 40 g of sodium hydroxide, 37% formaldehyde was 150 ⁇ .
  • a phenol resin and Ni powder were mixed and applied under the following conditions to form a conductive resin film of ⁇ .
  • the magnet and the 5 mm copper ball were charged into a barrel at 60% of the barrel volume, and smooth polishing was performed by barrel polishing at an amplitude of 20 mm for 60 minutes.
  • Example 2 Ni plating was performed under the same conditions as in Example 2.
  • the obtained ring-shaped bond magnet was subjected to an environmental test (moisture resistance test) under the same conditions as in Example 2.
  • the results and film thickness dimensional accuracy (moisture resistance test) were performed. Tables 3 and 4 show the results.
  • the conductive film treatment condition was a treatment time of 30 minutes, and the composition of the treatment solution was phenol resin.
  • Example 2 did not show any spots observed under a microscope at 30 ⁇ magnification even after 800 hours.
  • Example 2 In the same manner as in Example 1, a ring-shaped bonded magnet having an outer diameter of 25 mm, an inner diameter of 23 mm and a height of 3 mm was produced.
  • the properties of the obtained bonded magnet were Br6.9 kG, iHc9.1 kOe, and (BH) max9.3 MGOe.
  • the obtained bonded magnet was placed in a vibration barrel, and dry barrel polishing was performed using a short cylindrical Sn piece having a diameter of 2 mm and a length of 1 mm to form a conductive coating layer of Sn fine particles.
  • the indentation depth of the Sn particles on the resin surface was about 0.9 ⁇ , and the coating thickness on the magnetic powder surface was 0.4 ⁇ .
  • the processing conditions for barrel polishing are the same as in Example 1.
  • the film thickness after plating was 22 ⁇ on the inner diameter side and 23 ⁇ on the outer diameter side.
  • the resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 5 shows the properties of the magnet before and after the moisture resistance test
  • Table 6 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test.
  • the conditions for the electro-Cu plating were a current density of 2.5 A / dm2, a plating time of 5 minutes, a pH of 10, and a bath temperature of 40 ° C.
  • the composition of the plating solution was 20 g of copper and 10 g of free cyanide / nOg / n.
  • the conditions of the electric Ni plating are the same as those in the first embodiment.
  • a ring-shaped bonded magnet obtained in the same manner as in Example 3 was put in a vibration barrel, and a dry barrel treatment was performed using a cylindrical Zn piece having a diameter of lmm and a length of 2 mm to form a conductive coating layer of Zn fine particles. .
  • the indentation depth of the Zn particles on the resin surface was about 0.8 ⁇ , and the coating thickness on the magnetic powder surface was 0.2 ⁇ .
  • the processing conditions for barrel polishing were the same as in Example 1.
  • Example 3 Thereafter, Cu and Ni plating were performed under the same conditions as in Example 3.
  • the resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 5 shows the properties of the magnet before and after the moisture resistance test
  • Table 6 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test.
  • a ring-shaped bonded magnet obtained in the same manner as in Example 3 was placed in a vibration barrel, and a dry barrel treatment was performed using a cylindrical Pb piece having a diameter of lmm and a length of lmm to form a conductive coating layer of Pb fine particles.
  • the press-in depth of the Pb particles on the resin surface was about 0.9 ⁇ , and the coating thickness on the magnetic powder surface was 0.6 ⁇ .
  • the processing conditions for barrel polishing were the same as in Example 1.
  • Example 3 Thereafter, Cu and Ni plating were performed under the same conditions as in Example 3.
  • the resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 5 shows the properties of the magnet before and after the moisture resistance test
  • Table 6 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test.
  • Example 3 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 3, electroless copper plating was performed. The plating thickness was 5 ⁇ . After the electroless copper plating, Cu and Ni plating were performed under the same conditions as in Example 3. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Before and after the humidity test Table 5 shows the characteristics, and Table 6 shows the results of surface conditions and the dimensional accuracy of the film thickness during the moisture resistance test. The conditions for the electroless copper plating were the same as in Comparative Example 1.
  • Example 3 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 3, a phenol resin and Ni powder were mixed to form a conductive film having a thickness of ⁇ . After the treatment, Cu and Ni plating were performed under the same conditions as in Example 3. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Table 5 shows the properties of the magnet before and after the moisture resistance test, and Table 6 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test. The conductive film treatment conditions were the same as in Comparative Example 2.
  • Example 3 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 3, forming a phenol resin layer as an adhesive layer in advance by a dipping method, and adhering Ag powder (particle diameter 0.7 ⁇ or less) to the surface Then, a conductive coating layer having a thickness of 7 ⁇ was formed using a vibration barrel. After the vibration barrel treatment, Cu and Ni plating were performed under the same conditions as in Example 3. The obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Table 5 shows the properties of the magnet before and after the moisture resistance test, and Table 6 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test. The vibration barrel treatment conditions were the same as in Comparative Example 3.
  • Example 2 In the same manner as in Example 1, a ring-shaped bonded magnet having an outer diameter of 34 mm, an inner diameter of 31 mm and a height of 8 mm was produced.
  • the properties of the obtained bonded magnet were iiBr6.7kG, iHc9.1kOe, and (BH) max9.1MGOe.
  • Example 2 It obtained similar manner as in Example 2 the magnet, and sealing and smoothing treatment with A1 2 0 3 based spherical barrel stones having an average diameter of 3mm with a vibrating barrel conditions.
  • a bonded magnet is inserted in a vibrating barrel, and dry barrel polishing is performed using short cylindrical Sn, Zn, and Pb pieces each having a diameter of lmm and a length of lmm.
  • Table 7 shows the depth of press-fitting of the metal particles on the resin surface, the sealing part, and the coating thickness on the magnetic powder surface.
  • the processing conditions for barrel polishing were the same as in Example 2.
  • the film thickness after plating was 21 ⁇ on the inner diameter side and 22 ⁇ on the outer diameter side.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 1000 hours. Tables 8 to 9 show the results and the film thickness dimensional accuracy.
  • the conditions for the Cu electroplating and Ni electroplating were the same as in Example 2.
  • Example 6 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 6, the same sealing and surface smoothing treatment as in Example 6 was performed, followed by cleaning, and then electroless copper plating. The plating thickness was 5 ⁇ . After electroless copper plating, Cu plating and Ni plating were performed under the same conditions as in Example 6.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) under the same conditions as in Example 6.
  • Table 8 shows the properties of the magnet before and after the moisture resistance test
  • Table 9 shows the surface condition results and the film thickness dimensional accuracy during the humidity resistance test.
  • the electroless copper plating conditions were the same as in Comparative Example 4.
  • Example 9 did not show any spots observed under a microscope at 30 ⁇ magnification even after 1000 hours.
  • the obtained bonded magnet was placed in a vibration barrel, and dry barrel polishing was performed using short cylindrical Fe, Ni, Co, and Cr pieces having a diameter of 0.7 mm and a length of 0.5 mm to form a conductive coating layer of the metal fine particles. Formed.
  • Table 10 shows the press-fitting depth of the metal particles on the resin surface and the coating thickness on the magnetic powder surface.
  • the processing conditions for barrel polishing are the same as in Example 1.
  • the film thickness after plating is 18 ⁇ on the inner diameter side and 21 ⁇ on the outer diameter side.
  • the resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 12 shows the properties of the magnet before and after the humidity resistance test
  • Table 13 shows the surface condition results and the film thickness dimensional accuracy during the humidity resistance test.
  • the conditions for the Cu plating and the Ni plating are the same as in the first embodiment.
  • Example 7 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 7, a phenol resin and Ni powder were mixed to form a conductive film having a thickness of ⁇ . After the treatment, Cu and Ni plating were performed under the same conditions as in Example 7. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Table 12 shows the properties of the magnet before and after the moisture resistance test, and Table 13 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test. The conductive film treatment conditions were the same as in Comparative Example 2.
  • Example 7 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 7, forming a phenol resin layer as an adhesive layer in advance by a dipping method, and then attaching Ag powder (particle diameter 0.7 ⁇ or less) to the surface Then, a conductive coating layer having a thickness of 7 ⁇ was formed using a vibration barrel. After the vibration barrel treatment, Cu and Ni plating were performed under the same conditions as in Example 7. The obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Table 12 shows the properties of the magnet before and after the moisture resistance test, and Table 13 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test. The vibration barrel treatment conditions were the same as in Comparative Example 3. Table 10
  • Example 15 In the same manner as in Example 1, a ring-shaped bonded magnet having an outer diameter of 29 mm, an inner diameter of 25 mm, and a height of 5 mm was produced. The characteristics of the obtained bonded magnet are shown in Table 15,
  • Example 2 the vibration barrel conditions Yore and sealing and smoothing treatment with A1 2 0 3 based spherical barrel stones having an average diameter of 3 mm.
  • a bonded magnet was inserted in a vibrating barrel, and dry barrel polishing was performed using short columnar Fe, Ni, Co, and Cr pieces of 0.5 mm in diameter and 0.4 mm in length to form a conductive coating layer of metal particles.
  • Table 14 shows the depth of press-fitting of the metal particles on the resin surface, the sealing part, and the coating thickness on the magnetic powder surface.
  • the processing conditions for barrel polishing were the same as in Example 2. After that, cleaning was performed, and electric Ni plating was performed by the trap plating method, and then Ni plating was performed.
  • the film thickness after plating was 20 ⁇ on the inner diameter side and 22 ⁇ on the outer diameter side.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 1000 hours. Tables 16 to 17 show the results and film thickness dimensional accuracy.
  • the conditions for the Cu electroplating and Ni electroplating were the same as in Example 2.
  • the zinc displacement treatment conditions were as follows: treatment time: 40 seconds, bath temperature: 22 ° C, liquid resistance: sodium hydroxide 300 g, zinc oxide 40 g / Z, ferric chloride lg / Z, rossel salt 30 g / / Was.
  • the film thickness was ⁇ . ⁇ .
  • Example 8 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 8, the same sealing and surface smoothing treatment as in Example 6 was performed, followed by cleaning, and electroless copper plating was performed. The plating thickness was 5 ⁇ . After electroless copper plating, Cu plating and Ni plating were performed under the same conditions as in Example 8.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) under the same conditions as in Example 8.
  • Tables 16 to 17 show the results and the film thickness dimensional accuracy.
  • the electroless copper plating conditions were the same as in Comparative Example 4.
  • Example 6 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 6, a phenol resin and Ni powder were mixed and applied to form a conductive resin film of ⁇ , and the magnet and a 5 mm steel ball were placed in a vibration barrel. 60% of the barrel volume was charged, and smooth polishing was performed by barrel polishing at an amplitude of 20 mm for 60 minutes. Thereafter, Cu plating and Ni plating were performed under the same conditions as in Example 8. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) under the same conditions as in Example 6. Tables 16 to 17 show the results and film thickness dimensional accuracy. The conductive film treatment conditions were the same as in Comparative Example 5.
  • Example 14 had spotting after about 700 hours, and Comparative Example 15 also had spotting after 550 hours. In contrast, Example 8 did not show any spots observed under a microscope at 30 ⁇ magnification even after 800 hours.
  • Example 2 In the same manner as in Example 1, a ring-shaped bond magnet having an outer diameter of 20 mm, an inner diameter of 17 mm and a height of 6 mm was produced.
  • the properties of the obtained bonded magnet were iiBr6.9 kG, iHc9.4 kOe, and (BH) max9.6MGOe.
  • the resulting bonded magnet was placed in a vibrating barrel, and dry barrel polishing was performed using a short cylindrical A1 piece having a diameter of 0.8 mm and a length of lmm to form a conductive coating layer of A1 fine particles.
  • the coating depth of the A1 fine particles on the resin surface was about 0.9 ⁇ , and the coating thickness on the magnetic powder surface was 0.5 ⁇ .
  • the processing conditions for barrel polishing are the same as in Example 1. After washing and zinc substitution, electric Ni plating was carried out by the trap plating method.
  • the film thickness after plating was 19 ⁇ on the inner diameter side and 21 ⁇ on the outer diameter side.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 18 shows the properties of the magnet before and after the humidity resistance test
  • Table 19 shows the surface condition results and the film thickness dimensional accuracy during the humidity resistance test.
  • the conditions of the electric Ni plating are the same as those in the first embodiment.
  • Example 9 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 9, a phenolic resin and Ni powder were mixed to form a conductive film having a thickness of ⁇ . After the treatment, Ni plating was performed under the same conditions as in Example 9. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours. Table 18 shows the properties of the magnet before and after the moisture resistance test, and Table 19 shows the surface condition results and the film thickness dimensional accuracy during the moisture resistance test. The conductive film treatment conditions were the same as in Comparative Example 2.
  • Example 2 In the same manner as in Example 1, a ring-shaped bonded magnet having an outer diameter of 36 mm, an inner diameter of 33 mm and a height of 3 mm was produced.
  • the properties of the resulting bonded magnet were Br 6.7 kG, iHc 9.2 kOe, and (BH) max 9.5 MGOe.
  • the surface was modified by A1 2 0 3 powder having a particle size of about 2 ⁇
  • a vegetable medium consisting of walnut nuts with a diameter of about 2 mm was charged at 50% of the barrel volume, the surface was polished by a dry method for 150 minutes, and the holes were sealed and smoothed.
  • the obtained bonded magnet is placed in a vibrating barrel, and dry barrel polishing is performed using a short cylindrical A1 piece with a diameter of 0.5 mm and a length of 0.7 mm to form a conductive coating layer of A1 fine particles.
  • the press-fitting coating depth of the Al particles on the resin surface was about 1.1 ⁇ , and the coating thickness on the magnetic powder surface was 0.6 ⁇ .
  • the processing conditions for barrel polishing are the same as in Example 1.
  • the film thickness after plating was 17 ⁇ on the inner diameter side and 19 ⁇ on the outer diameter side.
  • the obtained ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 500 hours.
  • Table 20 shows the properties of the magnet before and after the humidity resistance test
  • Table 21 shows the surface condition results and the film thickness dimensional accuracy during the humidity resistance test.
  • the conditions for the Cu electroplating and Ni electroplating were the same as in Example 2.
  • the treatment conditions for the zinc displacement treatment were a treatment time of 40 seconds, a bath temperature of 22 ° C., and a liquid composition of 300 g of sodium hydroxide, 40 g of zinc oxide, ferric chloride lg, and rossel salt 30 g /.
  • the film thickness was ⁇ . ⁇ .
  • Example 10 After washing the ring-shaped bonded magnet obtained in the same manner as in Example 10, the same sealing and surface smoothing treatment as in Example 10 was performed, followed by cleaning, and then electroless copper plating was performed. The plating thickness was 6 ⁇ . After the electroless copper plating, Ni plating was performed under the same conditions as in Example 10. The resulting ring-shaped bonded magnet was subjected to an environmental test (moisture resistance test) at 80 ° C and a relative humidity of 90% for 1000 hours. Table 20 shows the properties of the magnet before and after the humidity resistance test, and Table 21 shows the surface condition results and film thickness dimensional accuracy during the humidity resistance test. The conditions for electroless copper plating were the same as in Comparative Example 4.
  • Ni plating was performed under the same conditions as in Example 10.
  • An environmental test moisture resistance test
  • Table 20 shows the properties of the magnet before and after the moisture resistance test
  • Table 21 shows the results of the surface condition and the film thickness accuracy during the moisture resistance test.
  • the conductive film treatment conditions were the same as in Comparative Example 5.
  • Comparative Example 19 showed spotting after about 750 hours, and Comparative Example 20 showed spotting after 680 hours, whereas Example 10 showed 1000 hours. Even afterwards, there was no point ⁇ ⁇ observed with a microscope at a magnification of 30 ⁇ .
  • the present invention relates to a dry method using a porous R-Fe-B bonded magnet as a medium by using a mixture of an abrasive and a vegetable medium or a mixture of an abrasive and a vegetable medium modified with an inorganic powder.
  • the polishing powder, the inorganic powder and the polishing dust can be fixed and sealed in the pores of the R-Fe-B-based bonded magnet with the oil and fat content of the vegetable medium,
  • surface smoothing treatment can be performed and modified, and this R-Fe-B based bonded magnet can be formed with a barrel device using amorphous A1 such as spherical, massive or needle-like (one wire) of required dimensions.
  • Barrel polishing is performed by a dry method, and the crushed A1 fine particles are press-fitted onto the resin surface and the sealing portion of the bonded magnet surface, and the magnetic powder surface is coated with the A1 fine particles to obtain R-Fe-B.
  • After forming an A1 coating film on the surface of the bonded magnet By performing a zinc substitution treatment on the surface of the Al coating layer, a dense and pinhole-free electrolytic plating layer can be formed, and an R-Fe-B based bond magnet having extremely excellent corrosion resistance can be obtained.

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Abstract

Procédé de fabrication efficace d'aimants liés à base de R-Fe-B ayant différentes formes telles qu'un anneau ou un disque, qui sont extrêmement résistants à la corrosion et peuvent être facilement plaqués électriquement. La résistance à la corrosion d'un tel aimant est améliorée par formation efficace d'un film conducteur métallique à forte adhérence et uniforme sur la surface de l'aimant. Ledit procédé consiste à remplir les trous de l'aimant avec de la poudre à polir, de la poudre inorganique et des éclats de polissage, à fixer ces matériaux dans les trous à l'aide de graisse végétale et à fermer de manière étanche les trous résultants, puis à polir l'aimant au tonneau à l'aide d'une unité de tonnelage selon le procédé à sec à l'aide de pièces à forme quelconque, par ex. sphérique, massive ou aciculaire (en aiguille), d'une taille requise et constituées de Cu, Sn, Zn, Pb, Cd, In, Au, Ag, Fe, Ni, Co, Cr et Al et de pièces d'alliages desdits métaux utilisés en tant que milieux métalliques. Ces fines particules de métal à l'état broyé telles que Cu sont introduites par compression dans une surface de résine et dans les trous de l'aimant lié et couvrent ladite surface et lesdits trous et couvrent également les surfaces des particules de poudre magnétique, ce qui permet d'obtenir un film conducteur extrêmement uniforme formé sur la surface de l'aimant lié. Il devient ainsi possible de soumettre l'aimant lié à un placage électrique et d'obtenir un aimant lié à base de R-Fe-B plaqué qui possède une forte résistance à la corrosion et une détérioration minimale des propriétés magnétiques.
PCT/JP1998/004829 1997-10-30 1998-10-23 AIMANT LIE A BASE DE R-Fe-B EXTREMEMENT RESISTANT A LA CORROSION ET PROCEDE DE FABRICATION DUDIT AIMANT WO1999023675A1 (fr)

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EP98950380A EP1028437B1 (fr) 1997-10-30 1998-10-23 AIMANT LIE A BASE DE R-Fe-B EXTREMEMENT RESISTANT A LA CORROSION ET PROCEDE DE FABRICATION DUDIT AIMANT
DE69834567T DE69834567T2 (de) 1997-10-30 1998-10-23 Korrosionsbeständige r-fe-b verbundmagnet und herstellungsverfahren

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JP9/316435 1997-10-30
JP31643597 1997-10-30
JP9/333681 1997-11-17
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JP04455998A JP3236814B2 (ja) 1997-11-17 1998-02-10 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石及びその製造方法
JP04455898A JP3236813B2 (ja) 1997-10-30 1998-02-10 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法
JP10/44559 1998-02-10
JP04882898A JP3236816B2 (ja) 1998-02-12 1998-02-12 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法
JP10/48828 1998-02-12
JP10/48827 1998-02-12
JP04882798A JP3236815B2 (ja) 1998-02-12 1998-02-12 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法
JP10056044A JPH11238641A (ja) 1998-02-19 1998-02-19 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法
JP10/56044 1998-02-19
JP10083012A JPH11260614A (ja) 1998-03-12 1998-03-12 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法
JP10083011A JPH11260613A (ja) 1998-03-12 1998-03-12 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法
JP10/83012 1998-03-12
JP10/83011 1998-03-12
JP10/103496 1998-03-30
JP10103496A JPH11283818A (ja) 1998-03-30 1998-03-30 高耐食性Ｒ−Ｆｅ−Ｂ系ボンド磁石とその製造方法

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EP1024506A1 (fr) * 1999-01-27 2000-08-02 Sumitomo Special Metals Co., Ltd. Aimant permanent à base de terre rare et son procédé de fabrication
WO2002004714A1 (fr) * 2000-07-07 2002-01-17 Hitachi Metals, Ltd. Aimant r-t-b a placage de cuivre electrolytique et procede de placage
WO2003038157A1 (fr) * 2001-10-29 2003-05-08 Sumitomo Special Metals Co., Ltd. Procede de formation d'un revetement depose par electrolyse sur la surface d'un article
US6923898B2 (en) * 1999-07-01 2005-08-02 Neomax Co., Ltd. Electroplating device, and process for electroplating work using the device
CN113589594A (zh) * 2021-07-19 2021-11-02 Tcl华星光电技术有限公司 显示面板及其制备方法

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FR2819120B1 (fr) * 2000-12-28 2003-02-28 Valeo Equip Electr Moteur Procede de fabrication d'un inducteur d'une machine electrique tournante
JP4162884B2 (ja) * 2001-11-20 2008-10-08 信越化学工業株式会社 耐食性希土類磁石
WO2012118001A1 (fr) * 2011-03-02 2012-09-07 日立金属株式会社 Procédé de fabrication d'un aimant à liaison de terres rares
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CN103632687A (zh) * 2013-12-19 2014-03-12 广东金潮集团有限公司 一种cd光盘电镀材料
CN103779027A (zh) * 2014-01-27 2014-05-07 江西江钨稀有金属新材料有限公司 一种粘结型稀土磁粉及其制备设备
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EP1024506A1 (fr) * 1999-01-27 2000-08-02 Sumitomo Special Metals Co., Ltd. Aimant permanent à base de terre rare et son procédé de fabrication
US6399150B1 (en) 1999-01-27 2002-06-04 Sumitomo Special Metals Co., Ltd. Rare earth metal-based permanent magnet, and process for producing the same
US7053745B2 (en) 1999-01-27 2006-05-30 Neomax Co., Ltd. Rare earth metal-based permanent magnet, and process for producing the same
US6923898B2 (en) * 1999-07-01 2005-08-02 Neomax Co., Ltd. Electroplating device, and process for electroplating work using the device
WO2002004714A1 (fr) * 2000-07-07 2002-01-17 Hitachi Metals, Ltd. Aimant r-t-b a placage de cuivre electrolytique et procede de placage
US6866765B2 (en) 2000-07-07 2005-03-15 Hitachi Metals, Ltd. Electrolytic copper-plated R-T-B magnet and plating method thereof
KR100720015B1 (ko) * 2000-07-07 2007-05-18 가부시키가이샤 네오맥스 전해구리도금한 ｒ-ｔ-ｂ계 자석 및 그 도금 방법
WO2003038157A1 (fr) * 2001-10-29 2003-05-08 Sumitomo Special Metals Co., Ltd. Procede de formation d'un revetement depose par electrolyse sur la surface d'un article
US7449100B2 (en) 2001-10-29 2008-11-11 Hitachi Metals, Ltd. Method for forming electroplating film on surfaces of articles
CN113589594A (zh) * 2021-07-19 2021-11-02 Tcl华星光电技术有限公司 显示面板及其制备方法
CN113589594B (zh) * 2021-07-19 2022-07-12 Tcl华星光电技术有限公司 显示面板及其制备方法

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EP1028437A1 (fr) 2000-08-16
KR100374398B1 (ko) 2003-03-04
CN1279810A (zh) 2001-01-10
EP1028437A4 (fr) 2001-06-13
CN1205626C (zh) 2005-06-08
KR20010040267A (ko) 2001-05-15
EP1028437B1 (fr) 2006-05-17
DE69834567D1 (de) 2006-06-22
DE69834567T2 (de) 2007-04-26

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