CN107408454A

CN107408454A - The used coating device of manufacture method, this method and apparatus for coating of R T B based sintered magnets

Info

Publication number: CN107408454A
Application number: CN201680015230.2A
Authority: CN
Inventors: 福山建史; 三野修嗣
Original assignee: Hitachi Metals Ltd
Current assignee: Proterial Ltd
Priority date: 2015-03-13
Filing date: 2016-03-09
Publication date: 2017-11-28
Anticipated expiration: 2036-03-09
Also published as: JP6489205B2; WO2016147985A1; JPWO2016147985A1; CN107408454B

Abstract

A kind of manufacture method of R-T-B based sintered magnets, it is included in the process of the paste of the powder particle of the respective upper surface of R-T-B based sintered magnets, the metal of lower surface and side coating comprising heavy rare earth element RH, alloy and/or compound (RH is Dy and/or Tb)；With the process being heat-treated to temperature of the R-T-B based sintered magnets after coating paste below sintering temperature.The process of coating paste includes：For including the inner space with entrance opening portion and exit opening portion and by R-T-B based sintered magnets successively laterally across inner space in a manner of structure coating device, successively supply R-T-B based sintered magnets process；With paste is filled in the inner space of apparatus for coating, make the process of the upper surface of paste and the R-T-B based sintered magnets that are just moved in inner space, lower surface and contacts side surfaces.

Description

Coating device used in the manufacture methods of R-T-B based sintered magnets, this method and Apparatus for coating

Technical field

The present invention relates to the manufacturing technology of R-T-B based sintered magnets.

Background technology

It is known with R₂T₁₄Type B compound (R is rare earth element, and T is the transition elements that must include Fe) is the R- of principal phase T-B based sintered magnets are performance highest magnet in permanent magnet, dynamic in the voice coil motor (VCM) of hard disk drive or mixing The carrying of power car is used with the various motors such as motor and family's electrical article etc..

R-T-B based sintered magnets intrinsic coercivity H at high temperature_cJ(following, brief note makees " H_cJ") reduce, therefore can draw Rising can not backheating demagnetization.In order to avoid can not backheating demagnetization, in the case of for motor purposes etc., it is desirable to even if at high temperature Also it is able to maintain that high H_cJ。

Known R-T-B based sintered magnets are replacing R with heavy rare earth element RH (Dy, Tb)₂T₁₄R's in Type B compound A H during part_cJRise.In order to obtain high H at high temperature_cJ, a large amount of heavy rare earth members are added in R-T-B based sintered magnets Plain RH way is effective.But in R-T-B based sintered magnets, light rare earth is being replaced with heavy rare earth element RH as R During element RL (Nd, Pr), although H_cJImprove, residual magnetic flux density B but be present_r(following, brief note makees " B_r") reduce the problem of.Separately Outside, because heavy rare earth element RH is scarce resource, it is necessary to cut down its usage amount.

Therefore, in recent years, study to utilize and do not make B_rThe less heavy rare earth element RH reduced burns to improve R-T-B systems Tie the H of magnet_cJ.For example, as the method for making heavy rare earth element RH effectively supply and spread to R-T-B based sintered magnets, Patent document 1~4 discloses following method：Make the mixed-powder of RH oxides or RH fluorides and various metal M or M alloy It is present in the surface of R-T-B based sintered magnets, by being heat-treated in this condition, makes R-T-B based sintered magnets high Effect ground absorbs RH and/or M, improves the H of R-T-B based sintered magnets_cJ。

Patent document 1 discloses use the powder containing M (wherein, M is one kind or two or more in Al, Cu, Zn) With the method for the mixed-powder of the powder of RH fluorides.In addition, patent document 2 discloses that using by being formed under heat treatment temperature RTMAH (wherein, M is one kind or two or more in Al, Cu, Zn, In, Si, P etc. that A is boron or carbon, and H is hydrogen) knot of liquid phase The method of the powder of the alloy of structure, it is the mixed-powder of the powder such as the powder of the alloy and RH fluorides to disclose.

In patent document 3, patent document 4, disclose by using RM alloys (wherein, M be selected from Al, Si, C, P, Ti It is one kind or two or more in) powder or M1M2 alloys (M1 and M2 be a kind or 2 kinds in Al, Si, C, P, Ti etc. with On) powder and RH oxides mixed-powder, in heat treatment using RM alloys or M1M2 alloys by RH oxide portions also Original, a greater amount of R can be imported in magnet.

Prior art literature

Patent document

Patent document 1：Japanese Unexamined Patent Publication 2007-287874 publications

Patent document 2：Japanese Unexamined Patent Publication 2007-287875 publications

Patent document 3：Japanese Unexamined Patent Publication 2012-248827 publications

Patent document 4：Japanese Unexamined Patent Publication 2012-248828 publications

The content of the invention

Invent problem to be solved

In method described in patent document 1~4, on making the mixed-powder comprising RH compound powders be present in magnet Surface, there is the problem of following.I.e., in these methods, in its specific disclosure, above-mentioned mixed-powder is made in water or organic Magnet is impregnated in the slurry for disperseing to be formed in solvent and is lifted (dip-coating method).Now, the magnetic to lifting out from slurry Body carries out heated-air drying or natural drying.In addition, impregnating the method for magnet as replacing in the slurry, also disclosing will be above-mentioned The method (spraying process) that slurry is sprayed on magnet.However, in dip-coating method, anyway slurry all can due to gravity and Segregation is in magnet bottom.In addition, in spraying process, due to surface tension, the coating thickness of magnet ends thickens.Any one side Method is all difficult to make RH compounds in magnet surface uniformly exist.As a result, it is uneven with coating thickness, there is the H after heat treatment_cJ The problem of in the presence of very large deviation.

The present invention is in order that heavy rare earth element RH is effectively supplied and spread to R-T-B based sintered magnets so as to improve H_cJ, there is provided it is a kind of in the layer of powder particle of the magnet surface formation comprising heavy rare earth element RH, it can will include these powder The paste of particle is uniformly coated on the surface of R-T-B based sintered magnets, heavy rare earth element RH is equably deposited in magnet surface New device, apparatus and method.

For solving the method for problem

The embodiment of the manufacture method of the R-T-B based sintered magnets of the present invention includes：Prepare multiple R-T-B systems to burn The process for tying magnet；In above-mentioned multiple R-T-B based sintered magnets respective upper surface, lower surface and side coatings comprising heavy dilute The process of the paste of the powder particle of earth elements RH metal, alloy and/or compound (RH is Dy and/or Tb)；With to coating The process that temperature of the R-T-B based sintered magnets below sintering temperature after aforesaid paste is heat-treated, is coated with above-mentioned paste The process of agent includes：The process that above-mentioned multiple R-T-B based sintered magnets are supplied successively to coating device, above-mentioned coating device bag Include the inner space with entrance opening portion and exit opening portion and horizontal successively with above-mentioned multiple R-T-B based sintered magnets Formed to by way of above-mentioned inner space；Aforesaid paste is filled with the inner space of above-mentioned coating device, is made above-mentioned Above-mentioned upper surface, lower surface and the contacts side surfaces of paste and the R-T-B based sintered magnets just moved in above-mentioned inner space Process.

In some embodiment, at inner space of the above-mentioned R-T-B based sintered magnets by above-mentioned coating device, Above-mentioned entrance opening portion supports above-mentioned R-T-B based sintered magnets in a manner of it can slide, and with limit with it is above-mentioned The shapes and sizes of the motion of above-mentioned R-T-B based sintered magnets on the direction of quadrature transverse.

In some embodiment, there is regulation to be coated with above-mentioned R-T-B based sintered magnets in above-mentioned exit opening portion Aforesaid paste thickness shapes and sizes.

In some embodiment, the work of above-mentioned multiple R-T-B based sintered magnets is supplied successively to above-mentioned coating device Sequence includes：In the process that above-mentioned entrance opening portion inserts each R-T-B based sintered magnets；Above-mentioned entrance opening is inserted with a part The rear end face of R-T-B based sintered magnets in portion is by the front end face of another R-T-B based sintered magnet in above-mentioned transverse direction Promote, the process that another above-mentioned R-T-B based sintered magnet is inserted to above-mentioned entrance opening portion.

In some embodiment, including gas is pushed to and contacts the above-mentioned exit opening from above-mentioned coating device by one side At least the above lower surface of each R-T-B based sintered magnets of portion's discharge, while carrying the work of above-mentioned R-T-B based sintered magnets Sequence.

In some embodiment, including by it is being discharged from above-mentioned exit opening portion, pass through what is combined before and after aforesaid paste The process that multiple R-T-B based sintered magnets are separated into single R-T-B based sintered magnets.

In some embodiment, above-mentioned powder particle include RLM alloys (RL be Nd and/or Pr, M for selected from Cu, Fe, More than a kind of element in Ga, Co, Ni, Al) powder particle and RH compounds (RH is Dy and/or Tb, RH compound are RH It is at least one kind of in fluoride, RH oxygen fluorides and RH oxides) powder particle.

In some embodiment, above-mentioned RLM alloys contain RL more than 50 atom %, and above-mentioned RLM alloys is molten Point is below the temperature of above-mentioned heat treatment.

In some embodiment, the matter of above-mentioned RLM alloy powders and the powder of above-mentioned RH compounds in aforesaid paste Amount ratio is RLM alloys：RH compound=9.6：0.4~5：5.

The embodiment of the coating device of the present invention is in the respective upper surface of multiple R-T-B based sintered magnets, following table The powder particle of the metal of face and side coating comprising heavy rare earth element RH, alloy and/or compound (RH is Dy and/or Tb) The coating device used in the device of paste, including：Fill the inner space of aforesaid paste；With with above-mentioned multiple R-T-B systems The entrance opening portion and exit opening portion that sintered magnet is formed laterally across the mode of above-mentioned inner space successively, above-mentioned outlet is opened Oral area has the shapes and sizes of the thickness for the aforesaid paste for providing to be coated with above-mentioned R-T-B based sintered magnets.

In some embodiment, above-mentioned entrance opening portion is by side of the above-mentioned R-T-B based sintered magnets that can slide Formula supports, and the shape of the motion with the above-mentioned R-T-B based sintered magnets on the direction limited with above-mentioned quadrature transverse And size.

In some embodiment, include the species identical type or different types of second paste of filling and aforesaid paste The second inner space；With with multiple R-T-B based sintered magnets for being discharged from above-mentioned exit opening portion successively laterally across upper The second outlet opening portion that the mode of the second inner space is formed is stated, above-mentioned second outlet opening portion has regulation in above-mentioned R- The shapes and sizes of the total thickness for the aforesaid paste being coated with T-B based sintered magnets.

In some embodiment, have and limit above-mentioned R-T-B based sintered magnets relative to above-mentioned exit opening portion At least one of position limits part.

In some embodiment, it is provided with around above-mentioned entrance opening portion for above-mentioned R-T-B systems to be sintered Magnet is oriented to the inclination in above-mentioned entrance opening portion.

In some embodiment, above-mentioned exit opening portion is provided with the conical surface so that be filled into above-mentioned inner space Paste extrudes above-mentioned R-T-B based sintered magnets from surrounding.

In some embodiment, in addition to：Suppress aforesaid paste to the above-mentioned of above-mentioned entrance opening portion insertion The anti-backflow device that the gap in R-T-B based sintered magnets and above-mentioned entrance opening portion is flowed out, above-mentioned anti-backflow device have profit The sealed chamber to be pressurizeed with the gas being externally supplied to above-mentioned entrance opening portion.

In some embodiment, above-mentioned inner space has on the direction that above-mentioned R-T-B based sintered magnets pass through More than half less than 3/4ths size of the length of each R-T-B based sintered magnets.

In some embodiment, there are the multiple paste entrance holes connected with above-mentioned inner space.

In some embodiment, including：Entrance side structure with above-mentioned entrance opening portion；Opened with above-mentioned outlet Oral area, the outlet side structure of the above-mentioned inner space of regulation；With positioned at above-mentioned entrance side structure and above-mentioned outlet side structure Between, have make intermediate plate of the magnet that above-mentioned multiple R-T-B based sintered magnets pass sequentially through by hole, above-mentioned entrance side structure The divine force that created the universe has the first groove, provides the first paste stream by above-mentioned first groove and above-mentioned intermediate plate, above-mentioned outlet side structure has Second groove, the second paste stream is provided by above-mentioned second groove and above-mentioned intermediate plate, above-mentioned intermediate plate has above-mentioned first paste At least one paste of stream and above-mentioned second paste fluid communication is formed and above-mentioned inside by hole, above-mentioned second paste stream Multiple paste entrance holes of space connection.

The embodiment of the apparatus for coating of the present invention includes：Any one above-mentioned coating device；To above-mentioned spreader part The paste feedway of above-mentioned inner space filling aforesaid paste；Above-mentioned multiple R-T-B based sintered magnets are sequentially inserted into State the magnet feedway in entrance opening portion；Gas is pushed to one side and contacts the above-mentioned exit opening from above-mentioned coating device Portion discharge each R-T-B based sintered magnets at least the above lower surface, while carrying the dress of above-mentioned R-T-B based sintered magnets Put.

In some embodiment, above-mentioned magnet feedway also includes detent mechanism, and above-mentioned detent mechanism has and made The face that multiple R-T-B based sintered magnets slide successively is stated, adjusts each R-T-B based sintered magnets relative to above-mentioned coating device Above-mentioned entrance opening portion position.

The embodiment of the coating device of the present invention is to apply cloth bag in the respective upper surface of multiple magnets, lower surface and side The coating device used in the device of the paste of powder particle containing metal, alloy and/or compound, above-mentioned coating device bag Include：Fill the inner space of aforesaid paste；With with above-mentioned multiple R-T-B based sintered magnets successively laterally across above-mentioned internal empty Between mode the entrance opening portion and exit opening portion that form, above-mentioned exit opening portion has what regulation was coated with above-mentioned magnet The shapes and sizes of the thickness of aforesaid paste.

Invention effect

Using embodiments of the present invention, in order that the H of R-T-B based sintered magnets_cJImprove, can be to R-T-B systems Equably coating contains the paste of the powder particle comprising heavy rare earth element RH simultaneously in multiple faces of sintered magnet.

Brief description of the drawings

Fig. 1 is that device 100 is coated with used in one of the apparatus for coating for representing the present invention and is applied using device 100 is coated with The stereogram of the example of the R-T-B based sintered magnets 1 of cloth paste.

Fig. 2A is the front elevation (figure for the side that the magnet that coating finishes is discharged) for being coated with device 100.

Fig. 2 B are the back views (figure for the side that the magnet before coating is inserted into) for being coated with device 100.

Fig. 2 C are Fig. 2A and Fig. 2 B 2C-2C line sectional views.

Fig. 3 A are that (coating finishes for the front elevation of the coating device 100 of the state after R-T-B based sintered magnets are inserted into The figure for the side that magnet is discharged).

Fig. 3 B are the back view (magnetic before coating of the coating device 100 of the state after R-T-B based sintered magnets are inserted into The figure for the side that body is inserted into).

Fig. 3 C are Fig. 3 A and Fig. 3 B 3C-3C line sectional views.

Fig. 4 is to schematically show the entrance opening that multiple R-T-B based sintered magnets 1 are sequentially inserted into coating device 100 Portion 12, the figure by way of inner space 10 and from the discharge of exit opening portion 14.

Fig. 5 is the figure for the R-T-B based sintered magnets 1 for schematically showing the state after being coated with paste layer 2.

Fig. 6 is to schematically show the upper table using existing nozzle dispensers 24,84 in R-T-B based sintered magnets 1 The figure of the example of face 1a and lower surface 1b coating paste layers 2.

Fig. 7 is to schematically show the upper table using existing nozzle dispensers 24,84 in R-T-B based sintered magnets 1 The figure of another of the mode of face 1a and lower surface 1b coating paste layers 2.

Fig. 8 is to schematically show the R-T-B based sintered magnets after the coating device coating paste layer 2 using the present invention 1 figure of another.

Fig. 9 is the figure for the major part for representing the apparatus for coating of the present invention.

Figure 10 is to represent the coating device 100 with the addition structure 100c for being used to form the second inner space 16 Figure.

Figure 11 be schematically show R-T-B based sintered magnets 1 do not positioned fully by entrance side structure 100b, The figure of the unstable example of the postures of R-T-B based sintered magnets 1.

Figure 12 is the knot for representing to be provided with the coating device 100 of multiple restriction parts 104 in the position in exit opening portion 14 The figure of structure example.

Figure 13 is the band that a part for the paste layer 2 for being shown schematically in covering R-T-B based sintered magnets 1 is formed The sectional view of the recess 22 of shape.

Figure 14 is the figure for representing to be provided with the configuration example of the coating device 100 of the conical surface 105 in exit opening portion 14.

Figure 15 is to represent that the front section in entrance side structure 100b has the coating device 100 of anti-backflow device 120 Structure figure.

Figure 16 is the figure of the configuration example of the magnet supply portion in the embodiment for represent the apparatus for coating of the present invention.

Figure 17 is the knot of the carrying part for the magnet that the coating in the embodiment for represent the apparatus for coating of the present invention finishes The figure of structure example.

Figure 18 is the sectional view for the configuration example for representing thick drying device 50.

Figure 19 is the stereogram of the thick drying device 50 showed schematically in Figure 18.

Figure 20 is the sectional view for another configuration example for schematically showing thick drying device 50.

Figure 21 is the sectional view for another configuration example for schematically showing thick drying device 50.

Figure 22 be represent from multiple holes internally space 10 import paste coating device 100 configuration example figure.

Figure 22 line A-A figure in the example that the number that Figure 23 A are introduced into the hole of paste is 2.

Figure 22 line B-B figure in the example that the number that Figure 23 B are introduced into the hole of paste is 2.

Figure 22 line C-C figure in the example that the number that Figure 23 C are introduced into the hole of paste is 2.

Figure 22 line A-A figure in the example that the number that Figure 24 A are introduced into the hole of paste is 4.

Figure 22 line B-B figure in the example that the number that Figure 24 B are introduced into the hole of paste is 4.

Figure 22 line C-C figure in the example that the number that Figure 24 C are introduced into the hole of paste is 4.

Figure 25 is another example that R-T-B based sintered magnets 1 are not positioned fully in the apparatus for coating for represent the present invention Figure.

Figure 26 is the figure for the other structures example for representing the apparatus for coating of the present invention.

Figure 27 is the figure for the other structures example for representing the coating device 100 of the present invention.

Figure 28 is the sectional view for the other structures example for schematically showing thick drying device 50.

Figure 29 A are the cross-section photographs of the R-T-B based sintered magnets after coating paste in embodiment.

Figure 29 B are the schematic cross-sections in the region of sample A~E in the R-T-B based sintered magnets for represent embodiment.

Embodiment

＜ coating devices ＞

Before being illustrated to embodiments of the present invention, first the basic structure example of the apparatus for coating of the present invention is carried out Explanation.The present invention non-limiting example apparatus for coating be the respective upper surface of multiple R-T-B based sintered magnets, under The powder particle of the metal of surface and side coating comprising heavy rare earth element RH (RH is Dy and/or Tb), alloy and/or compound Paste device.Coating device described below is used in the device.

First, reference picture 1, Fig. 2A, Fig. 2 B and Fig. 2 C illustrate to one that is coated with device.Fig. 1 is denoted as one Coating device 100 and using be coated with device 100 be coated with paste R-T-B based sintered magnets 1 example.R-T-B systems burn Knot magnet 1 has upper surface 1a, lower surface 1b, a pair of side 1c, front end face 1d and rear end face 1e.Fig. 2A is coating device 100 Front elevation (figure for the side that the magnet that coating finishes is discharged), Fig. 2 B be coated with device 100 the back view (magnetic before coating The figure for the side that body is inserted into).Fig. 2 C are Fig. 2A and Fig. 2 B 2C-2C line sectional views.In Fig. 1, in order to refer to, show just That hands over represents X-axis, Y-axis, 3 arrows of Z axis respectively.In the other drawings, in order to refer to, 2 axles in XYZ axles are shown.

Coating device 100 in this, be configured to the upper surface 1a for the R-T-B based sintered magnets 1 shown in Fig. 1, Lower surface 1b and a pair of side 1c coatings include heavy rare earth element RH metal, alloy and/or compound (RH is Dy and/or Tb) Powder particle paste.The details of paste is explained below.The paste being applied is after drying process in magnet table Face forms the layer of the powder containing heavy rare earth element RH etc..By heat treatment (DIFFUSION TREATMENT) afterwards, heavy rare earth element RH from The layer of the powder is diffused into the inside of R-T-B based sintered magnets, so as to improve magnet characteristics.

Fig. 1 R-T-B based sintered magnets 1 have the shape of upper table convex bending upwardly, but can apply this hair As long as the R-T-B based sintered magnets 1 of bright apparatus for coating have the same cross sectional shape along specific direction, integrally may be used With with arbitrary shape and size.In the example of fig. 1, R-T-B based sintered magnets 1 extend in Z-direction, with Z axis just The section (section parallel with XY faces) of friendship is unrelated with position with the same shape and size in the Z-axis direction.In the example The upper surface 1a of middle R-T-B based sintered magnets 1 is curved surface, but upper surface 1a can also be plane.Can also on the 1a of upper surface In the presence of the groove or ridge extended in Z-direction.The lower surface 1b and side 1c of R-T-B based sintered magnets 1 are flat in this embodiment , but lower surface 1b and/or side 1c can also be curved surface.

As shown in Figure 2 C, coating device 100, which has, can fill the inner space 10 of paste and with multiple R-T-B systems The entrance opening portion 12 and exit opening portion 14 that sintered magnet 1 is formed laterally across the mode of inner space 10 successively.Illustrating Example in, coating device 100 possess by the outlet side structure 100a with exit opening portion 14 with entrance opening portion The structure of 12 entrance side structure 100b integrations, but the structure for being coated with device 100 is not limited to such example.It is being coated with The entrance side of device 100, as shown in fig. 2 b and fig. 2 c, inclined-plane 18 can be set around entrance opening portion 12.In addition, it is used for The hole 15 (paste entrance hole) of filling paste connects with inner space 10.

Then, reference picture 3A, Fig. 3 B and Fig. 3 C.Fig. 3 C are Fig. 3 A and Fig. 3 B 3C-3C line sectional views.These figures are corresponding In Fig. 2A, Fig. 2 B and Fig. 2 C, the state after 1 R-T-B based sintered magnet 1 inserts from entrance opening portion 12 is recorded.

As shown in Fig. 3 B and Fig. 3 C, there is no big gap between entrance opening portion 12 and R-T-B based sintered magnets 1, But as shown in Figure 3A, it is provided with gap between exit opening portion 14 and R-T-B based sintered magnets 1.The representativeness in the gap Size t is as shown in Figure 3 C.Typically, peripheries of the size t in gap along exit opening portion 14 is the same, but the present invention is unlimited In such example.The size t in gap can also be in the upper surface 1a, lower surface 1b, side 1c of R-T-B based sintered magnets 1 Each side there is mutually different value.

The entrance opening portion 12 of coating device 100 in this is by R-T-B based sintered magnets 1 in a manner of it can slide Support, R-T-B based sintered magnets 1 can be mobile in transverse direction (Z-direction).Entrance opening portion 12, which has, to be limited and laterally (Z axis Direction) R-T-B based sintered magnets 1 on orthogonal direction (direction in XY faces) motion shapes and sizes.Typically, enter The shape and size in the section orthogonal to Z-axis of mouth opening portion 12 can be designed as with R-T-B based sintered magnets 1 and Z axis The shape and size in orthogonal section are roughly equal.So, entrance opening portion 12 can be designed as the R-T-B being inserted into " positioning " of based sintered magnet 1 and it is filled in the shape that the paste of inner space 10 does not flow out to outside from entrance opening portion 12 State.In addition, as described later, R-T-B based sintered magnets 1 are not limited to the example relative to the positioning in entrance opening portion 12, can also Carried out using other devices.

The exit opening portion 14 of coating device 100 has the thickness for the paste for providing to be coated on R-T-B based sintered magnets 1 Shapes and sizes.Typically, the shape and size in the section orthogonal to Z-axis in entrance opening portion 12 have than R-T-B systems The shape and size in the section orthogonal to Z-axis of sintered magnet 1, after expanding the thickness equivalent to the paste being coated with laterally Shape and size.That is, pasted by the size t in the gap between exit opening portion 14 and R-T-B based sintered magnets 1 come regulation The thickness of oxidant layer.Paste layer is reduced after firm coating containing liquid components such as solvents, but by drying process, liquid component.Cause This, process that the thickness of paste layer can be over time and change.

The size of inner space 10 can be defined as appropriate value from various viewpoints.The Z-direction of inner space 10 On the small value of the size being dimensioned so as to than each R-T-B based sintered magnets 1 in the Z-axis direction.Because in R- , it is necessary to which R-T-B systems sinter magnetic as shown in Figure 3 C when the front end of T-B based sintered magnets 1 is projected into outside from exit opening portion 14 The reason that at least a portion of body 1 is substantially kept by entrance opening portion 12.The size typical case of inner space 10 in the Z-axis direction Ground can be set as R-T-B based sintered magnets 1 below the half of the size of Z-direction, such as can be set as Value in the range of 0.1mm~50mm.If the size of inner space 10 in the Z-axis direction is less than 0.1mm, by paste institute The powder particle contained, causing paste, internally 10 mobility reduces in space.In addition, if the size is more than 50mm, then R- The position of the front end of T-B based sintered magnets 1 easily changes.But the chi of R-T-B based sintered magnets 1 in the Z-axis direction It is very little it is big in the case of, the structure of the front position for limiting R-T-B based sintered magnets 1 is set by apposition, can will be internal empty Between 10 dimension enlargement in the Z-axis direction be larger than 50mm.The shape of inner space 10 is necessarily cube, it may be considered that The mobility of paste 20 is arbitrary shape.Inner space can be approximately discoid, or ellipsoid.With inner space The number in the hole 15 (paste entrance hole) that 10 connections receive paste 20 is not limited to 1, or multiple.Such as in fig. 3 c, Internally space 10 imports paste 20 at the 1 of the hole 15 formed in outlet side structure 100a top, but can also be under Side and/or side form same hole 15, and paste 20 is imported out of multiple holes 15 internally space 10.In addition it is also possible to as after As illustrating in the change example for the coating device stated, the paste connected with multiple paste entrance holes is formed in coating device 100 The stream of agent, paste 20 is imported from multiple paste entrance holes in coating device 100.Wherein, in the present invention, paste 20 is led The hole (opening portion) for entering inner space 10 is referred to as " paste entrance hole ".

Then, reference picture 4 (a), (b) and (c).Fig. 4 (a), (b) and (c) schematically show multiple R-T-B systems sintering Magnet 1 be sequentially inserted into coating device 100 entrance opening portion 12, by inner space 10 and from exit opening portion 14 discharge side Formula.Hereinafter, the example of coating action is illustrated while with reference to these figures.

First, as shown in Fig. 4 (a), R-T-B based sintered magnets 1, the entrance opening portion of insertion coating device 100 are prepared 12.Insertion uses magnet feedway (not shown), and R-T-B based sintered magnets 1 are pushed away along the direction of arrow parallel with Z axis Left direction into figure.Now, being arranged on the inclined-plane 18 of 100 entrance side of coating device makes R-T-B based sintered magnets 1 Leading section slide and be directed to the center in entrance opening portion 12.R-T-B based sintered magnets 1 by inner space 10, from Exit opening portion 14 discharges laterally.After painting process starts, before inner space 10 filled by paste, even if by R-T-B The insertion coating device 100 of based sintered magnet 1, does not carry out the coating of paste yet.However, it is preferred to paste is being filled into inner space Before 10, at least one R-T-B based sintered magnets 1 are inserted into coating device 100 to reduce the opening surface in exit opening portion 14 Product.

Then, from paste feedway (not shown), by being coated with the hole 15 of device 100, internally paste is filled in space 10 20.Apply appropriate pressure to paste 20.Fig. 4 (b) is shown schematically in the state that paste 20 is filled with inner space 10. Internally in space 10, paste 20 contacts with the surface of R-T-B based sintered magnets 1, by its Surface coating.By suitably adjusting The size t in above-mentioned gap, the pressure of paste, the translational speed of R-T-B based sintered magnets 1, can control and be flowed out to from gap The amount of outside paste 20, form the coating layer (paste layer 2) of the paste 20 of suitable thickness.The size t in gap can for example be set It is scheduled on 0.1mm~1mm scope.Magnet size is bigger, and the thickness of paste layer 2 is thicker, thus preferably.For example, can be in thickness The paste layer 2 with 200~500 μm of left and right thicknesses is formed on 6mm or so R-T-B based sintered magnets 1.

In the example shown in Fig. 4 (b), the R-T-B based sintered magnets 1 most started are sintered by next R-T-B systems Magnet 1 pushes the left direction in figure to along the direction of arrow parallel with Z axis.As described later, magnet feedway (not shown) Formed in a manner of multiple R-T-B based sintered magnets 1 to be supplied to coating device 100 successively.

As shown in Fig. 4 (c), in the R-T-B based sintered magnets discharged from the exit opening portion 14 of coating device 100 1 surface forms paste layer 2.The thickness of the paste layer 2 is by from the end face in exit opening portion 14 to R-T-B based sintered magnets 1 Surface between gap size t regulation.In addition, coating device is inserted into before paste 20 is filled into inner space 10 On the 100 R-T-B based sintered magnets 1 most started, the formation of paste layer 2 can not be fully realized sometimes.In such feelings Under condition, at least one R-T-B based sintered magnets 1 after painting process just beginning play the prefabrication (dummy) as coating Effect.

Because multiple R-T-B based sintered magnets 1 continuously provide to coating device 100, so in preferable embodiment party In formula, gap is not formed between the front and rear adjacent 2 R-T-B based sintered magnets 1 constantly moved.If between as being formed Gap, then the gap can be full of by paste 20, as a result, the front end face 1d and rear end face 1e of R-T-B based sintered magnets 1 also shape be present Into the possibility of paste layer 2.In the case of gap being formed between 2 R-T-B based sintered magnets 1, it is difficult to suitably adjust The size in the gap, therefore, the thickness of the front end face 1d and rear end face 1e of covering R-T-B based sintered magnets 1 paste layer 2 are held It is also easy to produce big deviation.It is therefore preferable that between not formed between the front and rear adjacent 2 R-T-B based sintered magnets 1 constantly moved The mode of gap inserts R-T-B based sintered magnets 1 coating device 100 one by one.

The R-T-B based sintered magnets 1 come out from the exit opening portion 14 of coating device 100 be in its four sides (1a, 1b, The state of paste layer 2 1c) is formd, it is desirable to keep away manual-free or fixture support or grip R-T-B based sintered magnets 1. In embodiment described later, for the R-T-B based sintered magnets 1 discharged from the exit opening portion 14 of coating device 100, gas Promote and contact from its lower face side, carried by left side of the air-flow in suspension into figure.In the carrying, paste layer 2 At least dry tack free.Gas is pushed to and contacts the devices of R-T-B based sintered magnets 1 for example including to be sprayed from a large amount of apertures The workbench that the mode of air is formed.Because R-T-B based sintered magnets 1 are from workbench suspension, so real with other objects In matter under discontiguous state, the dry tack free of paste layer 2.As a result, the layer of the powder contained by paste layer 2 can be with basically identical Thickness cladding R-T-B based sintered magnets 1 surface (four sides).

Fig. 5 schematically shows the R-T-B based sintered magnets 1 of the state after being coated with paste layer 2.Fig. 5 (a), (b) and (c) top plane view of R-T-B based sintered magnets 1 after coating paste layer 2, front elevation and Fig. 5 (a) are respectively schematically represented 5C-5C line sectional views.As shown in figure 5, the upper surface 1a of R-T-B based sintered magnets 1, lower surface 1b and 2 side 1c are pasted Oxidant layer 2 covers.But the front end face 1d and rear end face 1e of the R-T-B based sintered magnets 1 in this are not covered by paste layer 2.

The apparatus for coating and coating method of the present invention can be for R-T-B based sintered magnets 1 except front end face 1d is with after Other faces beyond the 1e of end face disposably form paste layer 2, are equably covered by the layer of powder after the drying, therefore productivity ratio Height, production are excellent.

Then, in order to compare, for using existing nozzle dispensers by R-T-B based sintered magnets 1 in R-T-B systems The method that the face and the back side of sintered magnet carry out paste coating successively illustrates.

Fig. 6 is schematically shown using existing nozzle dispensers 24,84 in the upper surface of R-T-B based sintered magnets 1 The example of 1a and lower surface 1b coating paste layers 2.In this example, first, R-T-B based sintered magnets 1 are being placed in work In the state of making platform 80, paste is coated on to the upper surface 1a of R-T-B based sintered magnets 1 using nozzle dispensers 24, formed Paste layer 2c.Paste layer 2c is fully dried, after it can operate, spin upside down R-T-B based sintered magnets 1.Then, Using nozzle dispensers 84, paste is coated on to the lower surface 1b of R-T-B based sintered magnets 1, forms paste layer 2d.In Fig. 6 Example in, the thickness of paste layer 2c thickness and paste layer 2d is of substantially equal.

Fig. 7 is schematically shown using existing nozzle dispensers 24,84 in the upper surface of R-T-B based sintered magnets 1 Another example of the mode of 1a and lower surface 1b coating paste layers 2.Carried in this embodiment and first by R-T-B based sintered magnets 1 It is placed in the state of workbench 80, paste is coated on to the upper surface of R-T-B based sintered magnets 1 using nozzle dispensers 24 1a, form paste layer 2c.But now, make the paste layer 2c big Dt of thickness ratio design load.Then, R-T-B systems are made to sinter magnetic Body 1 is spun upside down.The lower surface 1b of R-T-B based sintered magnets 1 is on close level in paste layer apart from the height of workbench 80 The aggregate value of 2c thickness and the thickness of R-T-B based sintered magnets 1.Compared with Fig. 6 example, due to paste layer 2c thickness Big Dt, so the lower surface 1b of R-T-B based sintered magnets 1 and the interval of the lower end of nozzle dispensers 84 reduce.As a result, in profit When paste to be coated on to the lower surface 1b formation paste layer 2d of R-T-B based sintered magnets 1 with nozzle dispensers 84, paste layer 2d The small Dt of thickness ratio design load.So, Dt 2 times of difference is produced between paste layer 2c thickness and paste layer 2d thickness It is different.

As described above, in the method using existing nozzle dispensers, exist and be difficult to control in R-T-B systems sintering magnetic The problem of the thickness for the paste layer 2 that the upper surface 1a and lower surface 1b of body 1 are formed.In addition, if utilize above-mentioned prior art Paste is coated with the upper surface 1a and lower surface 1b of R-T-B based sintered magnets 1, paste also be present from upper surface 1a and lower surface 1b is in the possibility laterally overflowed on (direction vertical with side 1c).In such a situation, if sintered in R-T-B systems Two side 1c coating pastes of magnet 1, then paste layer is easily thickening near the side of R-T-B based sintered magnets 1.Separately Outside, when the side 1c to R-T-B based sintered magnets 1 is coated, if a part for paste is from side 1c sides Overflow, then the thickness of the paste layer on the side 1c of R-T-B based sintered magnets 1 becomes uneven, it is difficult to burnt in R-T-B systems The side 1c of knot magnet 1 is formed uniformly the paste layer of desired thickness.

As described above, using the coating device and coating method of the present invention, it can suppress such and in the prior art can The thickness deviation of caused paste layer.It also, both need not spin upside down R-T-B based sintered magnets 1, it is not required that upset The paste of inter process is dried, and can form coating layer simultaneously to 4 faces of R-T-B based sintered magnets 1, therefore productivity ratio carries It is high.

Fig. 8 schematically shows the R-T-B based sintered magnets 1 that paste layer 2 is coated with using the coating device of the present invention Another example.R-T-B based sintered magnets 1 in this possess the shape of the cuboid of rectangular cross-sectional.Fig. 8 (a), (b) and (c) respectively schematically represents to be coated with top plane view, front elevation and Fig. 8 of the R-T-B based sintered magnets 1 of paste layer 2 (a) 8C-8C line sectional views.Fig. 8 R-T-B based sintered magnets 1 are main not with Fig. 5 R-T-B based sintered magnets 1 Same point is the shape in the section orthogonal with long axis direction.In the example of hgure 5, its section is rectangle.As shown in figure 8, R- Upper surface 1a, the lower surface 1b and 2 side 1c of T-B based sintered magnets 1 are covered by paste layer 2.Design coating device 100 Entrance opening portion 12 and the shape and size in exit opening portion 14, comply with the shape and size in such section.

So, using the present invention, paste can be coated with around R-T-B based sintered magnets 1, it is uniform to form thickness The paste layer of ground adjustment.

＜ apparatus for coating ＞

Fig. 9 represents the major part of the apparatus for coating with above-mentioned coating device.The apparatus for coating includes：For by R- T-B based sintered magnets 1 are sequentially inserted into a pair of rolls 30a, 30b of coating device 100；For supplying R-T-B to roller 30a, 30b The platform 40 of based sintered magnet 1；With the paste filling device 102 that paste 20 is supplied to coating device 100.A pair of rolls 30a, 30b mono- While multiple each R-T-B based sintered magnets 1 are extruded from above or below, while moving its left direction into figure.Roller 30a, 30b can also be the mode that each R-T-B based sintered magnets 1 are extruded from side.By roller 30a, 30b action, multiple R- T-B based sintered magnets 1 are seamlessly supplied to coating device 100.

In addition, the apparatus for coating also includes thick drying device 50, the thick drying device 50 can be while carry from spreader One side of R-T-B based sintered magnets 1 that the paste coating that part 100 comes out finishes is dried.The thick drying device 50 of diagram is logical Cross and air (gas) is pushed to and contacts at least lower surface for each R-T-B based sintered magnets 1 discharged from coating device 100 Side, R-T-B based sintered magnets 1 is suspended slightly from thick drying device 50 and carried.R-T-B based sintered magnets 1 are rear Continuous R-T-B based sintered magnets 1 promote to be carried one by one.Also, the upper surface of thick drying device 50 can also incline Tiltedly.According to magnet shape, the R-T-B based sintered magnets 1 of suspension can utilize deadweight to be moved towards the descent direction of inclined plane.

Thick drying device 50 has the upper surface formed with the large number of orifices for blow out air.The size in each hole can be exemplified by Such as diameter 2mm circle.Air is typically dry air but it is also possible to be the other kinds of gas such as nitrogen.In addition, also may be used To use the porous middle plate formed with more aperture.In addition, the shape in hole can be any shape, such as configuration example as be described hereinafter Like that, it can be slit-shaped.

Other structures example on thick drying device 50 is explained below.

＜ is coated with the other structures example ＞ of device

Coating device 100 in such apparatus for coating is not limited to have the device of structure shown in Fig. 9, it is possible to have its His structure.It is, for example, possible to use passed sequentially through as shown in Figure 10 with R-T-B based sintered magnets 1 fill respectively it is different types of The coating device that the mode of 2 layers of paste layer is formed is formed in multiple inner spaces of paste, on R-T-B based sintered magnets 1 100。

Figure 10 coating device 100 includes being used for the addition structure 100c for forming the second inner space 16.The addition structure Divine force that created the universe 100c coverings include the region in the exit opening portion 14 in outlet side structure 100a, together with outlet side structure 100a Provide the second inner space 16.Opened with adding outlet of the structure 100c exit opening portion 17 more than outlet side structure 100a Oral area 14, regulation are designed by the mode for being coated with the aggregate thickness of the 2 layers of paste formed.

Using such coating device, the first inner space 10 is filled with the first paste 20a, is filled with the second paste 20b Second inner space 16.When R-T-B based sintered magnets 1 are by the first inner space 10, in R-T-B based sintered magnets 1 Surface coating paste 20a and form the first paste layer 2a.Then, the second inner space is passed through in R-T-B based sintered magnets 1 When 16, it is coated with paste 20b on the first paste layer 2a and forms the second paste layer 2b.

In addition it is also possible to further other additional structures of arrangement, the thus paste layer of more than 3 layers of lamination.

First paste layer 2a and the second paste layer 2b can be formed from the same material, can also be by different material shapes Into.In embodiment described later, it is coated with R-T-B based sintered magnets 1 comprising the powder particle formed by different materials Paste., can be easily in the position close to the surface of R-T-B based sintered magnets 1 when using Figure 10 coating device 100 Paste of the configuration comprising RLM alloy powders, the position configuration on the remote surface of R-T-B based sintered magnets 1 include RH compounds The paste of powder.

Figure 11 schematically show R-T-B based sintered magnets 1 do not positioned fully by entrance side structure 100b, R-T- The unstable example of the postures of B based sintered magnets 1.In this example, R-T-B based sintered magnets 1 internally incline in space 10 Tiltedly.Therefore, R-T-B based sintered magnets 1 are offset relative to the position in exit opening portion 14, the thickness off-design of paste layer 2 It is worth and becomes uneven.

Figure 12 is the figure for representing not occur the improvement example of the mode of position skew as described above.In Figure 12 coating device In 100, multiple restriction parts 104 are provided with the position in exit opening portion 14.These limit part 104 respectively from exit opening The periphery in portion 14 is prominent to center, and the front end for limiting part 104 limits the position of R-T-B based sintered magnets 1.Limit part 104 surface partly with R-T-B based sintered magnets 1 contacts, and can be slided relative to R-T-B based sintered magnets 1 are relative. Therefore, the surface of R-T-B based sintered magnets 1 and the interval of the periphery in exit opening portion 14 are equably maintained, and eliminate paste The phenomenon of the thickness significantly off-design value of layer 2.

Figure 13 is shown schematically in the ribbon that a part for the paste layer 2 of covering R-T-B based sintered magnets 1 is formed Recess 22.The recess 22 of paste layer 2 is due to limit the presence of part 104 and do not carry out the part of paste coating.But such as Shown in Figure 13, R-T-B based sintered magnets 1 from coating device 100 discharge after, due to the paste layer 2 before drying containing liquid into Point, therefore the Rapid Expansion because of surface tension.As a result, the recess 22 of paste layer 2 disappears or is contracted to the chi that can ignore that It is very little.It is preferred that the width of recess 22 is reduced, therefore each width for limiting part 104 can be set as that such as 0.2~1mm's or so is big It is small.

Part 104 is limited in the slip of the surface of R-T-B based sintered magnets 1, may be in R-T-B based sintered magnets 1 surface forms small scar or shallow groove.But because the surface of R-T-B based sintered magnets 1 is eventually through grinding etc. It is processed, therefore the formation of small scar or shallow groove will not have undesirable effect to final magnet characteristics.

In addition, limiting the periphery that part 104 is necessarily arranged on exit opening portion 14, outlet side structure can also be arranged on Thing 100a other positions.

Figure 14 represents that exit opening portion 14 is provided with the configuration example of the conical surface 105.If the conical surface 105 as existing, is being pasted When agent flows to exit opening portion 17, produce substantially equally it is extruded around the front end of R-T-B based sintered magnets 1 Power.Therefore, even if R-T-B based sintered magnets 1 are internally tilted in space 10, the paste extruded by the conical surface also can be by R-T- The position correction of B based sintered magnets 1 is in appropriate scope.

Figure 15 represents the front section apposition structure of anti-backflow device 120 in entrance side structure 100b.Counterflow-preventing Device 120 has the sealed chamber 122 for the pressure for applying compressed air to entrance side structure 100b entrance opening portion 12.Specifically For, anti-backflow device 120 to cover entrance side structure 100b entrance opening portion 12, externally to anti-backflow device 120 The mode that the space (sealed chamber) formed between entrance side structure 100b receives air is formed.Anti-backflow device 120 has There is the opening portion 19 for passing through R-T-B based sintered magnets 1.If the hypertonia of air, air may be caused to enter and be filled with In the inner space 10 of paste 20, but via the space being present between opening portion 19 and R-T-B based sintered magnets 1, air To external leakage, therefore it can prevent the pressure of air from becoming too high.

The configuration example ＞ of ＜ apparatus for coating

Reference picture 16, the configuration example of apparatus for coating is illustrated.

The apparatus for coating of diagram possesses above-mentioned any coating device.The apparatus for coating has：For by R-T-B systems A pair of rolls 30a, 30b and burnt for supplying R-T-B systems to roller 30a, 30b that sintered magnet 1 is sequentially inserted into coating device 100 Tie the conveyer 64 of magnet 1.Conveyer 64 has roller 64a, 64b and conveyer belt 64c.

In addition, the apparatus for coating has the accumulator 60 that can carry a large amount of R-T-B based sintered magnets 1.It is mounted in storage R-T-B based sintered magnets 1 in glassware 60 are put into cylinder 62 and are pushed on conveyer 64.By accumulator 60 and input cylinder 62 Form loader.The R-T-B based sintered magnets 1 that are loaded on conveyer belt 64c with by roller 64a, 64b rotation and the biography that rotates Band 64c is sent to be moved together to coating device 100.Be clipped in R-T-B based sintered magnets 1 between a pair of rolls 30a, 30b successively by Insertion coating device 100, is supplied to painting process.Roller 30a, 30b, can from each R-T-B based sintered magnets 1 are clamped up and down Reliably inserted the entrance opening portion 12 of coating device 100.Loading part with R-T-B based sintered magnets 1 to coating device The 100 continual mode of supply is by the sustainable supply of R-T-B based sintered magnets 1 to conveyer 64.

Then, reference picture 17.As shown in figure 17, from the R-T-B based sintered magnets 1 of the discharge of device 100 are coated with because spraying Air and suspend and move in the upper surface of thick drying device 50.The thick drying to paste layer 2, paste are carried out in the movement At least surface of layer 2 is dried.The temperature of the air of blowout can be typically room temperature, but in order to promote thick drying, also may be used So that the temperature of the air of blowout is higher than room temperature.Then, R-T-B based sintered magnets 1 are moved to main drying device 70, there The standby necessary time, carry out the drying of paste layer 2.Main drying device 70 has roller 70a, 70b, conveyer belt 70c and pressure roller 70d.Wherein, thick drying device 50 and/or main drying device 70 can be only fitted in hothouse (not shown).

For the fully dried R-T-B based sintered magnets 1 of paste layer 2, using a pair of pinch rolls 72 from dry in trunk Standby multiple R-T-B based sintered magnets 1 in connection status one by one are cut into single on device 70, are then passed through Chute 74 is discharged to discharge from apparatus for coating.The tangential direction speed of pinch roll 72, i.e. revolving circumferential velocity regulation sandwich pinch roll The translational speed of 72 R-T-B based sintered magnets 1.The translational speed is set to the conveyer belt 70c's than main drying device 70 Translational speed is high.By the pressure roller 70d of main drying device 70 action, can be in from standby on main drying device 70 Multiple R-T-B based sintered magnets 1 of connection status one by one, the R-T-B based sintered magnets 1 that will be clipped by pinch roll 72 Cut.

The configuration example ＞ of the thick drying devices of ＜

First, reference picture 18.Figure 18 schematically show thick drying device perpendicular to the section of Z-direction.

According to the embodiment of the present invention, with around R-T-B based sintered magnets 1 by the state that paste layer 2 covers from Coating device 100 is discharged.Because the paste layer 2 after just discharge does not have drying, if R-T-B based sintered magnets 1 directly put Grip on a moving belt or with human hand or fixture, then may cause paste layer 2 will have local variations in thickness or paste layer 2 one Peel off part.Thick drying device 50 shown in Figure 18 has：Multiple holes (slit-shaped openings portion) 52a for blow out air, 52b；Receive the opening portion 54 of air supply and the opening portion 56 of the slit-shaped for additional air to be discharged to outside.

Hole 52a is formed in a manner of blow out air, is lifted with resisting the gravity of R-T-B based sintered magnets 1.This The width of hole 52a in embodiment for example can be 1mm.Hole 52b is configured to blow out for will be by air from side direction center Air near the position adjustment for the R-T-B based sintered magnets 1 for lifting and suspending to center.Hole 52b in present embodiment Width for example can be 0.5~3mm in the range of value.In order to be formed in the upper surface of R-T-B based sintered magnets 1 Or the air-flow of lower surface flowing, can the appropriate position of adjusting hole 52b width and short transverse, with stable holding R-T-B The posture of based sintered magnet 1.For by air be discharged to outside slit-shaped opening portion 56 width for example, it can be set in 1mm In the range of~10mm.

Figure 19 is the stereogram of the thick drying device 50 schematically shown in Figure 18.Due to the hole 52a from slit-shaped, The air flow slit-shaped openings portion 56 that 52b sprays, so the R-T-B based sintered magnets 1 to be suspended on thick drying device 50 The side wall moved along Z-direction without colliding thick drying device 50 is promoted by follow-up R-T-B based sintered magnets 1.As above Described, the upper surface of thick drying device 50 can be inclined relative to horizontal.

Hole 52a, 52b shape, size and number are not limited to the example shown in Figure 18 and Figure 19.Hole 52a, 52b are necessarily With shape of slit.Shape, size and the number of opening portion 56 are also not limited to the example shown in Figure 18 and Figure 19.

If being not provided with opening portion 56, the air sprayed from hole 52a, 52b will be from R-T-B based sintered magnets 1 One side flow direction top, can not keep R-T-B based sintered magnets 1 horizontal sometimes.It is therefore preferable that set will from hole 52a, The air that 52b sprays is discharged to the opening portion 56 outside device.

During instead of opening portion as setting 56 using other structures, it can also make the appearance of R-T-B based sintered magnets 1 Gesture is stable.

Figure 20 is the sectional view for another configuration example for schematically showing thick drying device 50.Thick drying in the example The upper surface (face relative with R-T-B based sintered magnets 1) of device 50 tilts such as 0.5~3 degree left side relative to horizontal direction It is right.That is, slightly rotated from Y direction to X-direction in XY faces relative to the normal of the upper surface of thick drying device 50.Pass through Such inclination, the R-T-B based sintered magnets 1 of suspended state bear the power towards the X-direction in figure.The power with from hole The dynamic balance of the air of 52b blowouts, so, the position of the R-T-B based sintered magnets 1 of suspended state in the X-axis direction are stable, The posture of R-T-B based sintered magnets 1 is also appropriately adjusted.

Figure 21 is the sectional view for another configuration example for schematically showing thick drying device 50.Thick drying in the example The upper surface (face relative with R-T-B based sintered magnets 1) of device 50 is bent in a manner of concavity.That is, by so Bending, the R-T-B based sintered magnets 1 of suspended state are born towards the power near center.So, the R-T- of suspended state The position of B based sintered magnets 1 in the X-axis direction is stable, and the posture of R-T-B based sintered magnets 1 is also appropriately adjusted.

＜ is coated with the change example ＞ of device

Figure 22 be represent from coating device 100 in formed multiple holes internally space 10 import paste coating device The figure of 100 configuration example.Figure 22 line A-A figure in the example that the number that Figure 23 A are introduced into the hole of paste is 2.Equally, scheme Figure 22 line B-B figure and line C-C figure in the example that the number that 23B and Figure 23 C are introduced into the hole of paste respectively is 2.

Figure 22 coating device includes：Entrance side structure 100b with entrance opening portion 12；With exit opening portion The 14 and outlet side structure 100a of regulation inner space 10；With positioned at entrance side structure 100b and outlet side structure 100a Between, and with making intermediate plate 130 of the magnet that multiple R-T-B based sintered magnets pass sequentially through by hole 134.Intermediate plate 130 have the paste that paste passes through is passed through hole 132a, 132b.

Entrance side structure 100b shown in Figure 23 A has the recess shape from being opened to the side to connect with intermediate plate 130 Into the first groove 140.In the example of figure, the first groove 140 imports the hole 15 ' being coated with device 100 from by paste by outside Position extends along the face parallel with XY faces, and 2 are divided into halfway.The branch of first groove 140 is the two of entrance opening portion 12 Side extends along the direction parallel with Y direction.The depth (depth of recess) of first groove 140 is less than entrance side structure 100b's Thickness.The space clipped by the first groove 140 and intermediate plate 130 provides the first paste stream 145.

Outlet side structure 100a shown in Figure 23 C has the recess shape from being opened to the side to connect with intermediate plate 130 Into the second groove 150, the space clipped by the second groove 150 and intermediate plate 130 provides the second paste stream 155.First and second The flowing path section of paste stream 145,155 is, for example, 1~400mm²Left and right.

Intermediate plate 130 shown in Figure 23 B has 2 pastes for connecting the first paste stream 145 with the second paste stream 155 Agent passes through hole 132a, 132b.The paste for being arranged at intermediate plate 130 is not limited to 2 by the number in hole, or and 1, but it is excellent Elect as multiple.

Second paste stream 155 is empty by multiple hole (paste entrance hole) 15a, 15b for being arranged on diverse location and inside Between 10 connection.

The paste imported from the hole 15 ' of the entrance side structure 100b shown in Figure 23 A circulates in the first paste stream 145, Fill the inside of the first paste stream 145.It is filled in centre of the paste inside the first paste stream 145 shown in by Figure 23 B The paste of plate 130 passes through hole 132a, 132b, the second paste stream 155 of the outlet side structure 100a shown in inflow Figure 23 C It is interior.The paste flowed into the second paste stream 155 respectively by multiple paste entrance hole 15a, 15b import inner space 10 it In.The paste entrance hole such as diameter with 1~20mm.

Figure 22 line A-A figure in the example that the number that Figure 24 A are introduced into the hole of paste is 4.Equally, Figure 24 B and figure Figure 22 line B-B figure and line C-C figure in the example that the number that 24C is introduced into the hole of paste respectively is 4.

Figure 24 A entrance side structure 100b and Figure 24 B intermediate plate 130 has the entrance side structure with Figure 23 A respectively Thing 100b and Figure 23 B intermediate plate 130 construct same construction.Difference is the outlet side structure shown in Figure 24 C 100a construction.Figure 24 C outlet side structure 100a also has the second groove 150, by between the groove 150 of intermediate plate 130 and second Space provide the second paste stream 155.The characteristic point of this is, flows into the paste in the second paste stream 155 by 4 Paste entrance hole 15a, 15b, 15c, 15d each hole are imported among inner space 10.If paste is imported into inner space 10 The number increase in hole 1, even if then paste quantity delivered changes, its influence is also disperseed.As a result, it is possible to reduce by being coated with institute's shape Into paste layer uneven thickness.

In addition, in Figure 22~Figure 24 C, paste 20 is passed through into the hole 15 ' that is formed in entrance side structure 100a top 1 at be externally introduced, but same hole 15 ' can also be formed in entrance side structure 100a lower section and/or side, from more Individual hole 15 ' imports paste 20 into coating device 100.

The change example ＞ of ＜ apparatus for coating

As shown in figure 25, if conveyer 64 relative to coating device 100 relative height ratio datum-plane or height or It is low, then it may result in position and entrance of the R-T-B based sintered magnets 1 relative to the entrance opening portion 12 of coating device 100 Angle is offset.When R-T-B based sintered magnets 1 are supplied in coating device 100 from entrance opening portion 12, if R-T-B Gap between based sintered magnet 1 and entrance opening portion 12 is big, then the skew of position and/or entry angle easily increases.If Such skew is produced, then as shown in figure 25, the thickness of the paste layer 2 of coating can become uneven.The position in entrance opening portion 12 Put and/or the precision of entry angle can directly affect paste layer 2 thickness precision, so needing high precision.Entrance opening The influence of the position in portion 12 and/or the skew of entry angle R-T-B based sintered magnets 1 have on long axis direction extension compared with It is obvious during long shape.

Figure 26 has been expressed as position skew as suppression and has had the reference block for playing the function as detent mechanism The figure of the configuration example of 35 apparatus for coating.Positioning datum block 35, which has, to be used to limit the R-T-B systems sent from conveyer 64 The upper surface (sliding surface) of the motion of the above-below direction (Y-direction) of sintered magnet 1.Positioning datum block 35 for example passes through machining The precision of height and angle is formed, R-T-B based sintered magnets 1 are pressed against on positioning datum block 35 by using roller, with high Intensive qualifications enter position and the entry angle of the R-T-B based sintered magnets 1 in entrance opening portion 12.In addition, except the positioning Outside block 35, the left and right directions (X-direction) relative to direct of travel of restriction R-T-B based sintered magnets 1 can also be set The other locating piece and roller of motion.For the positioning datum block of the motion that limits above-below direction (Y-direction) and for limiting a left side The locating piece of the motion of right direction (X-direction) can be integrated.I.e., it is possible to it is provided for limiting the positioning of the motion in XY directions The roller of block and corresponding all directions.

The one side of R-T-B based sintered magnets 1 is pressed lightly in the upper surface of positioning datum block 35 by roller, while in spreader It is mobile among the entrance opening portion 12 of part 100 with the precision level of high position and entry angle.Positioning datum block 35 it is upper The position of the above-below direction on surface can correspondingly adjust with the position of the above-below direction in the entrance opening portion 12 in coating device 1 It is whole.In addition, the above-mentioned position energy (not shown) for being used to limit the left and right directions of the locating piece of the motion of left and right directions (X-direction) Enough positions with being coated with the left and right directions in the entrance opening portion 12 of device 1 correspondingly adjust.In Figure 26 example, positioning datum The upper surface of block 35 is horizontal, but be coated with because of some purposes device 100 itself it is inclined in the case of, also can be with coating device 100 inclination accordingly tilts the upper surface of reference block 35, so that angle of inclination phase of the entry angle with being coated with device 100 Matching.

Figure 27 is the figure for another configuration example for representing the coating device 100 of the present invention.In the coating device 100, by Inner space 10 as defined in outlet side structure 100a, in the direction that R-T-B based sintered magnets 1 pass through (Z-direction), tool There is more than half less than 3/4ths size of the length of each R-T-B based sintered magnets 1.For example, the Z axis of inner space 10 More than 2mm is dimensioned so as on direction, in typical example in the range of 4~90mm.

In Figure 27 example, the front end of R-T-B based sintered magnets 1 is temporarily entirely buried in the inside of paste, is formed Float over the state in paste.Then, with the gap turn narrow of inner space, by bigger dynamic pressure, it is achieved in placed in the middle (centering).Figure 27 inner space 10 has the temporary transient paste for realizing each R-T-B based sintered magnets 1 as described above The size (more than half of the size of R-T-B based sintered magnets 1) of interior suspension.At if R-T-B based sintered magnets 1 are overall In floating over the state in paste completely, then it is difficult to play the centering effect brought by the conical surface 105, therefore the size of inner space 10 Preferably less than 3/4ths of the size of R-T-B based sintered magnets 1.That is, the preferred front end of R-T-B based sintered magnets 1 When in internally positioned space 10, outside the internally positioned space 10 in rear end of R-T-B based sintered magnets 1.Additionally, it is preferred that by long enough The conical surface 105 appropriately sized dynamic pressure is formed to R-T-B based sintered magnets 1 on the move, to cause R- in suspension The front end of T-B based sintered magnets 1 does not settle in paste.The conical surface 105 in the Z-axis direction be dimensioned so as to inner space 10 More than/20th of size in the Z-axis direction, preferably 1/3rd of the size of inner space 10 in the Z-axis direction with On, more preferably more than half.The size of inner space 10 in the Z-axis direction can be with identical, i.e. inner space 10 is overall can be by The conical surface is formed.

Figure 28 schematically shows the sectional view of the other structures example of thick drying device 50.Thick drying device in the example 50 compared with Figure 21 example, has the shorter recess shapes of radius of curvature, with the curved of the R-T-B based sintered magnets 1 of arcuate The state of curved surface downward is slightly dried.The radius of curvature of the flexure plane of R-T-B based sintered magnets 1 and thick drying device The radius of curvature of 50 recess is necessarily consistent.Focus in end 55a, the flexure plane of R-T-B based sintered magnets 1 with it is thick The space of the recess of drying device 50 is relative to shorten.By the shortening in such space, air can be suppressed and burnt from R-T-B systems The both sides leakage of magnet is tied, realizes appropriate carrying.

Hereinafter, the preferred embodiment of the present invention is described in detail.

[R-T-B based sintered magnets mother metal]

First, in the present invention, the diffusion couple as heavy rare earth element RH is as preparing R-T-B based sintered magnet mother metals. Wherein, in this manual, in order to be readily appreciated that, sometimes using as the R-T-B systems burning of heavy rare earth element RH diffusion couple elephant Knot magnet is exactly known as R-T-B based sintered magnet mother metals, but the term of " R-T-B based sintered magnets " is also including such " R-T-B based sintered magnets mother metal ".The R-T-B based sintered magnets mother metal can use known material, have for example with Under composition.

Rare-earth element R：12~17 atom %

B (a part of of B (boron) can be replaced by C (carbon))：5~8 atom %

Addition element M ' (is selected from Al, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, Zr, Nb, Mo, Ag, In, Sn, Hf, Ta, W, Pb With it is at least one kind of in Bi)：0~2 atom %

T (transition metal based on Fe, Co can be included) and inevitable impurity：Remainder

Wherein, rare-earth element R is mainly LREE RL (Nd and/or Pr), but can also contain heavy rare earth element.Its In, in the case of containing heavy rare earth element, preferably comprise heavy rare earth element RH (Dy and/or Tb) at least one party.

The R-T-B based sintered magnets mother metal of above-mentioned composition can be manufactured by arbitrary manufacture method.

[paste]

Paste contains the mixture of diffusant or diffusant and spreading aids.

Diffusant typically can be that (RH is Dy to RH compounds and/or Tb, RH compound are RH fluorides and/or RH oxygen Fluoride) powder.In certain preferred embodiment, RH compound powders are with aftermentioned performance as the function of spreading aids RLM alloy powders are equal by quality ratio or less than its.In order to equably be coated with RH compound powders, preferably RH compound powders The granularity at end is small.According to the research of the present inventor, 2 particles of the granularity preference aggregation of the powder of RH compounds it is big Small is less than 20 μm, more preferably less than 10 μm.Small powder is several μm or so (more than 1 μm) in 1 particle.

Spreading aids typically can be the powder of RLM alloys.Wherein, as RL, it is adapted to the effect for reducing RH compounds The high LREE of fruit, RL are Nd and/or Pr.M is more than a kind in Cu, Fe, Ga, Co, Ni, Al.As diffusion When the materials'use Nd-Cu alloys and/or Nd-Al alloys of auxiliary agent, RH compounds caused by Nd can be effectively played Reducing power, H_cJRaising effect it is higher.In addition, in certain embodiment, RLM alloys contain RL more than 50 atom %, and And its fusing point is below heat treatment temperature.The granularity of the powder of RLM alloys is preferably less than 150 μm, more preferably 100 μm with Under.Easily aoxidized in the undersized of RLM alloy powders, from the viewpoint of anti-oxidation, the granularity of RLM alloy powders Lower limit is 5 μm or so.The typical case of the granularity of the powder of RLM alloys is 20~100 μm.

RL content ratio is in more than 50 atom % RLM alloys, and the ability of RL reduction RH compounds is high, and fusing point Below heat treatment temperature.Therefore, melt, efficiently reduce RH compounds, with what is be reduced more at high proportion in heat treatment RH spreads in R-T-B based sintered magnet mother metals, even if on a small quantity, also can efficiently make the H of R-T-B based sintered magnets_cJ Improve.In certain embodiment, RLM alloys contain RL more than 65 atom %.

Paste can by above-mentioned RH compound powders and RLM alloy powders mixed adhesive, water and/or solvent come Make.Solvent for example can be organic solvent.Due to the coating weight and H of RLM alloy powders_cJThe degree of raising is not directly relevant to, Therefore also had no problem even if a little bias is produced due to gravity or surface tension.Wherein, as long as adhesive and solvent are at it In the temperature-rise period of heat treatment afterwards temperature below the fusing point of RLM alloys occur thermal decomposition or evaporation and from R-T-B systems The surface of sintered magnet removes, and its species is not particularly limited.

According to the embodiment of the present invention, for being coated on the paste on surface of R-T-B based sintered magnet mother metals Ask from the uniformity that coating layer shape is similarly shunk, ensured during being applied to drying.Improving the weight of adhesive or powder During ratio, the viscosity increase of paste, therefore maintain the ability of the shape of coating layer to improve.In addition, contain low boiling in paste During solvent (alcohol or water), required time cripetura is dried, therefore the shape of coating layer also easily maintains.

[paste coating]

Using above-mentioned apparatus for coating, aforesaid paste is coated on R-T-B based sintered magnet mother metals.

By painting process, the powder as the RH compounds of diffusant and the RLM alloy powders one as spreading aids Rise and be configured in magnet surface.At this point it is possible to formed in first paste of the magnet surface coating comprising RLM alloy powder particles First paste layer, afterwards, it is coated with the second paste comprising RH compounds on first layer and forms the second paste layer.

RLM alloys contained by paste are because its fusing point is below heat treatment temperature, so being melted in heat treatment, thus shape The RH that Cheng Yigao efficiency is reduced readily diffuses into the state inside R-T-B based sintered magnets.It therefore, there is no need to make The powder of RLM alloys and the powder of RH compounds are present in before the surface of R-T-B based sintered magnets, and R-T-B systems are burnt The surface of knot magnet carries out pickling etc. and particularly cleans processing.Certainly it is not precluded from cleaning the feelings of processing as carrying out Condition.

Presence ratio of the RH compounds in the surface of R-T-B based sintered magnet mother metals contained by the layer of paste is (at heat Before reason) the RLM alloys in terms of quality ratio：RH compound=9.6：0.4~5：5.More preferably ratio be present is RLM alloys：RH Compound=9.5：0.5~6：4.

The present invention is not precluded from the paste of the powder (the 3rd powder) beyond powder of the coating comprising RLM alloys and RH compounds There is the 3rd powder in agent etc., but should be noted that the 3rd powder can not hamper on the surface of R-T-B based sintered magnet mother metals Hinder diffusion insides of the RH in RH compounds to R-T-B based sintered magnet mother metals.The powder of " RLM alloys and RH compounds " exists Shared quality ratio is wished for more than 70% in whole powder existing for the surface of R-T-B based sintered magnet mother metals.

In accordance with the invention it is possible to the H of R-T-B based sintered magnets is effectively improved with a small amount of RH_cJ.In R-T-B systems The preferred magnet surface of RH amount existing for the surface of sintered magnet is per 1mm²For 0.03~0.35mg, more preferably 0.05~ 0.25mg。

[diffusion heat treatments]

In the present invention, the powder of RLM alloys and the powder of RH compounds contained in paste are present in R-T-B systems It is heat-treated in the state of the surface of sintered magnet mother metal.In addition, after heat treatment starts, because the powder of RLM alloys melts Melt, so RLM alloys need not be always maintained to the state of " powder " in heat treatment.The preferred vacuum of atmosphere of heat treatment or Inactive gas atmosphere.Heat treatment temperature for below the sintering temperature of R-T-B based sintered magnets (it is specific be, for example, 1000 DEG C with Under) and higher than RLM alloys fusing point temperature.Heat treatment time is, for example, 10 minutes~72 hours.In addition, in above-mentioned heat Can the further heat treatment of the progress 10 minutes~72 hours at 400~700 DEG C as needed after processing.

In addition, the apparatus for coating of embodiments of the present invention is not limited to above-mentioned R-T-B based sintered magnets mother metal Example.The present invention apparatus for coating can be used in various magnet mother metals surface formed powder paste layer, make it is desired Method inside elements diffusion to magnet mother metal.

Embodiment

Using the apparatus and method with the coating device shown in Fig. 4, paste is carried out to R-T-B based sintered magnets mother metal Coating.

Used R-T-B based sintered magnets mother metal has the shape shown in Fig. 1, and its size is X-direction 28.4mm, Y Direction 6.88mm, Z-direction 32.3mm, the R 30.2mm of upper surface.The composition of R-T-B based sintered magnet mother metals is Nd= 13.4th, B=5.8, Al=0.5, Cu=0.1, Co=1.1, remainder=Fe (atom %), its magnetic characteristic pass through B-H tracers Device determines, as a result H_cJFor 1035kA/m, B_rFor 1.45T.

The composition of used paste is：Diffusant (the commercially available TbF below 10 μm of granularity₃(at. ratios) powder) and expand Dissipate auxiliary agent (the spherical Nd below 100 μm of granularity made by centrifugal atomization₇₀Cu₃₀(at. ratios) powder) with mass ratio 8:2 is mixed Close the mass % of mixed-powder 80, the mass % of polyvinyl alcohol 4, the mass % of water 16 formed.

So, the coating weight recorded with table 1 coats 4 faces of R-T-B based sintered magnet mother metals, and process is dried, Make the sample of No.1~3.It is 0.3 second left side for the time needed for the painting process of 1 R-T-B based sintered magnet mother metal It is right.

The section of sample No.2 after Figure 29 A expression drying processes.From Figure 29 A, it is basic to form thickness in 4 faces Uniform paste layer.

Then, the heat treatment for diffusion is carried out.Using machining by the table of resulting R-T-B based sintered magnets Each removing 0.2mm is distinguished in face, then cuts out 5 kinds of determination samples of A~E as described below to each sample of No.1~3.Sample A：In magnet Entreat the 6.28mm × 7.0mm × 7.0mm, sample B of part：The 1.0mm of the X-direction central portion surface portion of magnet bottom surface × 1.0mm × 1.0mm, sample C：1.0mm × 1.0mm × 1.0mm (samples of the X-direction central portion surface portion of magnet upper surface Product B, C Z-direction near center, cut out near sample A part), sample D and E：The Y-axis side of magnet two sides To 1.0mm × 1.0mm × 1.0mm of central Z-direction central portion surface portion.Sample A in R-T-B based sintered magnets~ E region representation is in Figure 29 B schematic section.

Using B-H tracer determination samples A~E magnetic characteristic, H is obtained to sample A_cJAnd B_rVariable quantity, to sample B ~E obtains H_cJVariable quantity (not to sample B~E determine B_rIt is because sample is small, the low-down reason of measurement accuracy).By result It is shown in table 2 and table 3.As shown in Table 2, in the whole samples of No.1~3, B_rAll almost H without reduction_cJGreatly improve.Separately Outside, as shown in Table 3, each sample B~E H_cJRoughly equally improve, do not see uneven with the coating thickness of paste layer Big deviation caused by even.In addition, sample B~E is the determination sample near magnet surface, therefore the Tb spread concentration ratio Magnet center is high nearby, so H_cJIt is higher than sample A.In addition, sample D, E of side be close to upper and lower surface, also by from upper The influence of the diffusion of lower surface, therefore H_cJSample B, C than upper surface, lower surface is slightly higher.

[table 1]

[table 2]

[table 3]

Industrial applicability

Using embodiments of the present invention, multiple faces coating simultaneously of R-T-B based sintered magnets can be included and be used for Carry out the paste of the powder particle of the modification of R-T-B based sintered magnets.Thus, for example, heavy rare earth element RH is set effectively to supply It is given to R-T-B based sintered magnets and improves the production of its method spread.

Symbol description

1：R-T-B based sintered magnets；1a：The upper surface of R-T-B based sintered magnets；1b：R-T-B based sintered magnets Lower surface；1c：The side of R-T-B based sintered magnets；1d：The front end face of R-T-B based sintered magnets；1e：R-T-B systems The rear end face of sintered magnet；2：Paste layer；10：Inner space；12：Entrance opening portion；14：Exit opening portion；15：Hole；16：The Two inner spaces；18：Inclined-plane；19：The opening portion of anti-backflow device；20：Paste；50：Thick drying device；52a、52b：It is multiple Hole；54：Receive the opening portion of air supply；56：Air is discharged to the opening portion of outside；100：It is coated with device；100a：Outlet side Structure；100b：Entrance side structure；100c：Additional structure；104：Limit part；105：The conical surface；120：Counterflow-preventing fills Put；122：Sealed chamber.

Claims

A kind of 1. manufacture method of R-T-B based sintered magnets, it is characterised in that including：

Prepare the process of multiple R-T-B based sintered magnets；

In the respective upper surface of the multiple R-T-B based sintered magnets, lower surface and side, coating includes heavy rare earth element RH Metal, alloy and/or compound powder particle paste process, wherein, RH is Dy and/or Tb；With

The process being heat-treated to temperature of the R-T-B based sintered magnets after the coating paste below sintering temperature,

Being coated with the process of the paste includes：

To the coating device process that supplies the multiple R-T-B based sintered magnets successively, the coating device include having into The inner space in mouthful opening portion and exit opening portion and with the multiple R-T-B based sintered magnets successively laterally across institute The mode for stating inner space is formed；With

The paste is filled in the inner space of the coating device, makes the paste with being moved in the inner space The upper surfaces of R-T-B based sintered magnets, the process of lower surface and contacts side surfaces.
2. the manufacture method of R-T-B based sintered magnets as claimed in claim 1, it is characterised in that：

At inner space of the R-T-B based sintered magnets by the coating device, the entrance opening portion is by described in R-T-B based sintered magnets are supported in a manner of it can slide, and with the institute on the direction limited with the quadrature transverse State the shapes and sizes of the motion of R-T-B based sintered magnets.
3. the manufacture method of R-T-B based sintered magnets as claimed in claim 1 or 2, it is characterised in that：

The exit opening portion has the shape of the thickness for the paste for providing to be coated with the R-T-B based sintered magnets And size.
4. such as the manufacture method of R-T-B based sintered magnets according to any one of claims 1 to 3, it is characterised in that：

The process for supplying the multiple R-T-B based sintered magnets successively to the coating device includes：

In the process that the entrance opening portion inserts each R-T-B based sintered magnets；With

The rear end face for the R-T-B based sintered magnets that a part is inserted in the entrance opening portion is burnt by another R-T-B system The front end face of knot magnet is promoted in the cross direction, and another described R-T-B based sintered magnet is inserted into the entrance opening The process in portion.
5. such as the manufacture method of R-T-B based sintered magnets according to any one of claims 1 to 4, it is characterised in that bag Include：

While each R-T-B systems that gas is pushed to and contacted discharge from the exit opening portion of the coating device are sintered into magnetic At least described lower surface of body, while carrying the process of the R-T-B based sintered magnets.
6. such as the manufacture method of R-T-B based sintered magnets according to any one of claims 1 to 5, it is characterised in that bag Include：

By multiple R-T-B based sintered magnets separation being discharged from the exit opening portion, by being combined before and after the paste For the process of single R-T-B based sintered magnets.
7. such as the manufacture method of R-T-B based sintered magnets according to any one of claims 1 to 6, it is characterised in that：

The powder particle includes the particle of RLM alloy powders and the powder particle of RH compounds, wherein, RL is Nd and/or Pr, M is more than a kind of the element in Cu, Fe, Ga, Co, Ni, Al, and RH is Dy and/or Tb, RH compound are RH fluorides, RH It is at least one kind of in oxygen fluoride and RH oxides.
8. the manufacture method of R-T-B based sintered magnets as claimed in claim 7, it is characterised in that：

The RLM alloys contain RL more than 50 atom %, and the fusing point of the RLM alloys the heat treatment temperature with Under.
9. the manufacture method of R-T-B based sintered magnets as claimed in claim 7 or 8, it is characterised in that：

The quality ratio of the RLM alloy powders and the powder of the RH compounds in the paste is RLM alloys：RH chemical combination Thing=9.6：0.4~5：5.
10. one kind coating device, it is characterised in that：

It is that coating includes heavy rare earth element RH in the respective upper surface of multiple R-T-B based sintered magnets, lower surface and side Metal, alloy and/or compound powder particle paste device in the coating device that uses, wherein, RH be Dy and/or Tb,

The coating device includes：

Fill the inner space of the paste；With

By the multiple R-T-B based sintered magnets successively laterally across the inner space in a manner of the entrance opening portion that is formed With exit opening portion,

The exit opening portion has the shape of the thickness for the paste for providing to be coated with the R-T-B based sintered magnets And size.
11. coating device as claimed in claim 10, it is characterised in that：

The entrance opening portion supports the R-T-B based sintered magnets in a manner of it can slide, and with limit with The shapes and sizes of the motion of the R-T-B based sintered magnets on the direction of the quadrature transverse.
12. the coating device as described in claim 10 or 11, it is characterised in that including：

Filling and the species identical type of the paste or the second inner space of different types of second paste；With

With multiple R-T-B based sintered magnets for being discharged from the exit opening portion successively laterally across second inner space The second outlet opening portion that forms of mode,

The second outlet opening portion has the total layer for the paste for providing to be coated with the R-T-B based sintered magnets Thick shapes and sizes.
13. the coating device as any one of claim 10~12, it is characterised in that including：

Limit the R-T-B based sintered magnets and limit part relative at least one of the position in the exit opening portion.
14. the coating device as any one of claim 10~13, it is characterised in that：

It is provided with around the entrance opening portion for the R-T-B based sintered magnets to be oriented into the entrance opening portion Inclination.
15. the coating device as any one of claim 10~14, it is characterised in that：

The exit opening portion is provided with the conical surface so that the paste for being filled into the inner space extrudes the R- from surrounding T-B based sintered magnets.
16. the coating device as any one of claim 10~15, it is characterised in that：

Also include：Suppress the paste from the R-T-B based sintered magnets and institute inserted to the entrance opening portion The anti-backflow device of the gap outflow in entrance opening portion is stated,

The anti-backflow device has the sealed chamber to be pressurizeed using the gas being externally supplied to the entrance opening portion.
17. the coating device as any one of claim 10~16, it is characterised in that：

The inner space has each R-T-B based sintered magnets on the direction that the R-T-B based sintered magnets pass through More than half less than 3/4ths size of length.
18. the coating device as any one of claim 10~17, it is characterised in that：

With the multiple paste entrance holes connected with the inner space.
19. the coating device as any one of claim 10~17, it is characterised in that including：

Entrance side structure with the entrance opening portion；

Outlet side structure with the exit opening portion, the regulation inner space；With

Between the entrance side structure and the outlet side structure, have and the multiple R-T-B systems is sintered magnetic The magnet that body passes sequentially through by the intermediate plate in hole,

The entrance side structure has the first groove, and the first paste stream is provided by first groove and the intermediate plate,

The outlet side structure has the second groove, and the second paste stream is provided by second groove and the intermediate plate,

The intermediate plate, which has, passes through at least one paste of the first paste stream and the second paste fluid communication Hole,

The second paste stream forms the multiple paste entrance holes connected with the inner space.
A kind of 20. device, it is characterised in that including：

Coating device any one of claim 10~19；

The paste feedway of the paste is filled to the inner space of the coating device；

The multiple R-T-B based sintered magnets are sequentially inserted into the magnet feedway in the entrance opening portion；With

While each R-T-B systems that gas is pushed to and contacted discharge from the exit opening portion of the coating device are sintered into magnetic At least described lower surface of body, while carrying the device of the R-T-B based sintered magnets.
21. device as claimed in claim 20, it is characterised in that：

The magnet feedway also includes detent mechanism, and the detent mechanism, which has, makes the multiple R-T-B systems sinter magnetic The face that body slides successively, adjust position of each R-T-B based sintered magnets relative to the entrance opening portion of the coating device Put.
22. one kind coating device, it is characterised in that：

It is the powder for including metal, alloy and/or compound in the coating of the respective upper surface of multiple magnets, lower surface and side The coating device used in the device of the paste of particle,

The coating device includes：Fill the inner space of the paste；With

By the multiple R-T-B based sintered magnets successively laterally across the inner space in a manner of the entrance opening portion that is formed With exit opening portion,

The exit opening portion has the shapes and sizes of the thickness for the paste for providing to be coated with the magnet.