CN107408454B

CN107408454B - Coating device and apparatus for coating used in the manufacturing method of R-T-B based sintered magnet, this method

Info

Publication number: CN107408454B
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: 2019-12-03
Anticipated expiration: 2036-03-09
Also published as: JP6489205B2; WO2016147985A1; JPWO2016147985A1; CN107408454A

Abstract

A kind of manufacturing method of R-T-B based sintered magnet comprising in the process of the paste of the powder particle of metal of the respective upper surface, lower surface and side of R-T-B the based sintered magnet coating comprising heavy rare earth element RH, alloy and/or compound (RH is Dy and/or Tb)；With the process being heat-treated to the R-T-B based sintered magnet after coating paste in sintering temperature temperature below.Coating paste process include: for include have entrance opening portion and exit opening portion inner space and by R-T-B based sintered magnet successively laterally across inner space in a manner of structure coating device, successively supply R-T-B based sintered magnet process；With paste is filled in the inner space of apparatus for coating, the process for contacting paste with the upper surface of the R-T-B based sintered magnet just moved in inner space, lower surface and side.

Description

Coating device and painting used in the manufacturing method of R-T-B based sintered magnet, this method Cloth apparatus

Technical field

The present invention relates to the manufacturing technologies of R-T-B based sintered magnet.

Background technique

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 main phase T-B based sintered magnet is the highest magnet of performance in permanent magnet, dynamic in the voice coil motor (VCM) of hard disk drive or mixing It is used in the various motors and family's electrical article etc. such as power vehicle carrying motor.

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

Known R-T-B based sintered magnet is replacing R with heavy rare earth element RH (Dy, Tb)₂T₁₄R's in Type B compound H when a part_cJIt increases.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 magnet The way of plain RH is effective.But in R-T-B based sintered magnet, as R heavy rare earth element RH displacement light rare earth When element RL (Nd, Pr), although H_cJIt improves, but there is residual magnetic flux density B_r(hereinafter, brief note makees " B_r") reduce the problem of. In addition, needing to cut down its usage amount since heavy rare earth element RH is scarce resource.

Therefore, in recent years, study to utilize and do not make B_rThe less heavy rare earth element RH reduced improves R-T-B system The H of sintered magnet_cJ.For example, as the side for making heavy rare earth element RH effectively supply and spread to R-T-B based sintered magnet Method, Patent Documents 1 to 4 disclose following method: making the mixing of RH oxide or RH fluoride and the alloy of various metal M or M Powder is present in the surface of R-T-B based sintered magnet, by being heat-treated in this state, R-T-B system is made to be sintered magnetic Body efficiently absorbs RH and/or M, improves the H of R-T-B based sintered magnet_cJ。

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

In patent document 3, patent document 4, disclose by using RM alloy (wherein, M be selected from Al, Si, C, P, It is one kind or two or more in Ti etc.) powder or M1M2 alloy (M1 and M2 are a kind or 2 kinds in Al, Si, C, P, Ti etc. More than) powder and RH oxide mixed-powder, in heat treatment using RM alloy or M1M2 alloy by RH oxide portion Divide reduction, a greater amount of R can be imported in magnet.

Existing technical literature

Patent document

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

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

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

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

Summary of the invention

Problems to be solved by the invention

In method documented by Patent Documents 1 to 4, about making the mixed-powder comprising RH compound powder be present in magnet There is following problem on surface.That is, in these methods, its it is specific it is open in, make above-mentioned mixed-powder in water or organic Disperse in the slurry to be formed to impregnate magnet in solvent and lifts (dip-coating method).At this point, to the magnetic for lifting out from slurry Body carries out heated-air drying or natural drying.In addition, replacing such method for impregnating magnet in the slurry, also disclosing will be above-mentioned Slurry sprays to the method (spray coating method) on magnet.However, in dip-coating method, anyway slurry all can due to gravity and Segregation is in magnet lower part.In addition, due to surface tension, the coating thickness of magnet ends thickens in spray coating method.Any one side Method is all difficult to have RH compound uniformly in magnet surface.As a result, H there is heat treatment after uneven with coating thickness_cJ There are problems that very large deviation.

The present invention improves to supply heavy rare earth element RH effectively to R-T-B based sintered magnet and spread H_cJ, can will include these powder when a kind of layer forming the powder particle comprising heavy rare earth element RH in magnet surface is provided The paste of particle is uniformly coated on the surface of R-T- B based sintered magnet, deposits heavy rare earth element RH equably in magnet surface New device, device and method.

The method used for solving the problem

The embodiment of the manufacturing method of R-T-B based sintered magnet of the invention includes: to prepare multiple R-T-B systems to burn The process for tying magnet；It is dilute comprising weight in the respective upper surface of above-mentioned multiple R-T-B based sintered magnets, lower surface and side coating The process of the paste of the powder particle of the metal of earth elements RH, alloy and/or compound (RH is Dy and/or Tb)；With to coating The process that R-T-B based sintered magnet after aforesaid paste is heat-treated in sintering temperature temperature below, is coated with above-mentioned paste The process of agent includes: the process for successively supplying above-mentioned multiple R-T-B based sintered magnets to coating device, above-mentioned coating device packet Include the inner space with entrance opening portion and exit opening portion and successively horizontal with above-mentioned multiple R-T-B based sintered magnets It is constituted to by way of above-mentioned inner space；Aforesaid paste is filled in the inner space of above-mentioned coating device, is made above-mentioned Paste is contacted with above-mentioned upper surface, lower surface and the side of the R-T-B based sintered magnet just moved in above-mentioned inner space Process.

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

In some embodiment, there is regulation to be coated on above-mentioned R-T-B based sintered magnet 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 successively supplied to above-mentioned coating device Sequence includes: the process for being inserted into each R-T-B based sintered magnet in above-mentioned entrance opening portion；Above-mentioned entrance opening is inserted into a part The rear end face of R-T-B based sintered magnet in portion is by the front end face of another R-T-B based sintered magnet in above-mentioned transverse direction It pushes, the process that another above-mentioned R-T-B based sintered magnet is inserted into above-mentioned entrance opening portion.

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

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

In some embodiment, above-mentioned powder particle include RLM alloy (RL be Nd and/or Pr, M be selected from Cu, Fe, The element of one or more of Ga, Co, Ni, Al) powder particle and RH compound (RH be Dy and/or Tb, RH compound be RH It is at least one kind of in fluoride, RH oxygen fluoride and RH oxide) powder particle.

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

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

The embodiment of coating device of the 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) Paste device used in be coated with device, comprising: fill the inner space of aforesaid paste；With with above-mentioned multiple R-T-B The entrance opening portion and exit opening portion that based sintered magnet is successively constituted laterally across the mode of above-mentioned inner space, above-mentioned outlet The shapes and sizes of the thickness for the aforesaid paste that there is regulation to be coated on above-mentioned R-T-B based sintered magnet for opening portion.

In some embodiment, side of the above-mentioned entrance opening portion by above-mentioned R-T-B based sintered magnet can slide Formula support, and there is the shape for the movement for limiting the above-mentioned R-T-B based sintered magnet on the direction with above-mentioned quadrature transverse And size.

In some embodiment, including filling and the type identical type of aforesaid paste or different types of second 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 constituted 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 on T-B based sintered magnet.

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

In some embodiment, it is provided with around above-mentioned entrance opening portion for being to be sintered by above-mentioned R-T-B 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 being filled into above-mentioned inner space Paste squeezes above-mentioned R-T-B based sintered magnet from surrounding.

In some embodiment, further includes: inhibit aforesaid paste to be inserted into above-mentioned entrance opening portion above-mentioned The anti-backflow device that the gap in R-T-B based sintered magnet and above-mentioned entrance opening portion is flowed out, above-mentioned anti-backflow device have benefit 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 magnet passes through More than half 3/4ths size below of the length of each R-T-B based sintered magnet.

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

In some embodiment, comprising: the entrance side structure with above-mentioned entrance opening portion；It is opened with above-mentioned outlet Oral area, the outlet side structure for providing above-mentioned inner space；Be located at above-mentioned entrance side structure and above-mentioned outlet side structure Between, the intermediate plate with the magnet through hole for passing sequentially through above-mentioned multiple R-T-B based sintered magnets, above-mentioned entrance side Structure has the first slot, determines the first paste flow path, above-mentioned outlet side structure tool by above-mentioned first slot and above-mentioned intermediate plate gauge There is the second slot, the second paste flow path is determined by above-mentioned second slot and above-mentioned intermediate plate gauge, above-mentioned intermediate plate has to be pasted above-mentioned first At least one paste through hole of agent flow path and above-mentioned second paste fluid communication, above-mentioned second paste flow path formed with it is above-mentioned interior Multiple paste entrance holes of portion space connection.

The embodiment of apparatus for coating of the invention includes: any one of the above 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 Above-mentioned R-T-B based sintered magnet is carried in at least the above lower surface of each R-T-B based sintered magnet of portion's discharge on one side Device.

In some embodiment, above-mentioned magnet feedway further includes positioning mechanism, above-mentioned positioning mechanism have make The face that multiple R-T-B based sintered magnets successively slide is stated, adjusts each R-T-B based sintered magnet relative to above-mentioned spreader The position in the above-mentioned entrance opening portion of part.

The embodiment of coating device of the invention is to apply cloth bag in the respective upper surface of multiple magnets, lower surface and side Device, above-mentioned coating device packet are coated with used in the device of the paste of powder particle containing metal, alloy and/or compound It includes: filling 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 constitute, there is regulation to be coated on above-mentioned magnet in above-mentioned exit opening portion The shapes and sizes of the thickness of aforesaid paste.

Invention effect

Using embodiments of the present invention, in order to make the H of R-T-B based sintered magnet_cJIt improves, it can be to R-T-B system Multiple faces of sintered magnet are equably coated with the paste for containing the powder particle comprising heavy rare earth element RH simultaneously.

Detailed description of the invention

Fig. 1 is to indicate the used coating device 100 of an example of apparatus for coating of the invention and applied using coating device 100 The exemplary perspective view of the R-T-B based sintered magnet 1 of cloth paste.

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

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

Fig. 2 C is the 2C-2C line sectional view of Fig. 2A and Fig. 2 B.

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

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

Fig. 3 C is the 3C-3C line sectional view of Fig. 3 A and Fig. 3 B.

Fig. 4 is the entrance opening for schematically showing multiple R-T-B based sintered magnets 1 and being 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 schematically showing the R-T-B based sintered magnet 1 of the state after coating paste layer 2.

Fig. 6 is the upper table schematically shown using existing nozzle dispensers 24,84 in R-T-B based sintered magnet 1 The exemplary figure of face 1a and lower surface 1b coating paste layer 2.

Fig. 7 is the upper table schematically shown using existing nozzle dispensers 24,84 in R-T-B based sintered magnet 1 Another figure of the mode of face 1a and lower surface 1b coating paste layer 2.

Fig. 8 is the R-T-B system sintering magnetic schematically shown using after coating device coating paste layer 2 of the invention Another figure of body 1.

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

Figure 10 is to indicate 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 magnet 1 do not positioned sufficiently by entrance side structure 100b, The unstable exemplary figure of the posture of R-T-B based sintered magnet 1.

Figure 12 is to indicate that the position in exit opening portion 14 is provided with the knot of multiple coating devices 100 for limiting component 104 The figure of structure example.

Figure 13 is the item for being shown schematically in a part of the paste layer 2 of covering R-T-B based sintered magnet 1 and being formed The sectional view of band-like recess portion 22.

Figure 14 is to indicate that exit opening portion 14 is provided with the figure of the structural example of the coating device 100 of the conical surface 105.

Figure 15 is to indicate 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 structural example of the magnet supply portion in the embodiment for indicate apparatus for coating of the invention.

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

Figure 18 is the sectional view for indicating the structural example of thick drying device 50.

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

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

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

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

Figure 23 A is the line A-A figure for importing Figure 22 in the example that the number in the hole of paste is 2.

Figure 23 B is the line B-B figure for importing Figure 22 in the example that the number in the hole of paste is 2.

Figure 23 C is the line C-C figure for importing Figure 22 in the example that the number in the hole of paste is 2.

Figure 24 A is the line A-A figure for importing Figure 22 in the example that the number in the hole of paste is 4.

Figure 24 B is the line B-B figure for importing Figure 22 in the example that the number in the hole of paste is 4.

Figure 24 C is the line C-C figure for importing Figure 22 in the example that the number in the hole of paste is 4.

Figure 25 is indicated in apparatus for coating of the invention, another example that R-T-B based sintered magnet 1 is not positioned sufficiently Figure.

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

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

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

Figure 29 A is the cross-section photograph that the R-T-B based sintered magnet after paste is coated in embodiment.

Figure 29 B is the schematic cross-section in the region of sample A~E in the R-T-B based sintered magnet for indicate embodiment.

Specific embodiment

< is coated with device >

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

Firstly, referring to Fig.1, Fig. 2A, Fig. 2 B and Fig. 2 C be illustrated an example of coating device.Fig. 1 shows as an example Coating device 100 and using coating device 100 be coated with paste R-T-B based sintered magnet 1 example.R-T-B system burns Tying 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 of the discharged side of the magnet that coating finishes), 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 is the 2C-2C line sectional view of Fig. 2A and Fig. 2 B.In Fig. 1, in order to refer to, show just Hand over respectively indicate X-axis, Y-axis, Z axis 3 arrows.In the other drawings, in order to refer to, 2 axis in XYZ axis are shown.

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

The R-T-B based sintered magnet 1 of Fig. 1 has upper surface convex curved shape upwards, but can apply this hair As long as the R-T-B based sintered magnet 1 of bright apparatus for coating has the same cross sectional shape along specific direction, integrally may be used With arbitrary shape and size.In the example of fig. 1, R-T-B based sintered magnet 1 extends in Z-direction, just with Z axis The section (section parallel with the face XY) 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 magnet 1 is curved surface, but upper surface 1a may be plane.It can also be on the 1a of upper surface In the presence of the slot or ridge extended in Z-direction.The lower surface 1b and side 1c of R-T-B based sintered magnet 1 are flat in this embodiment , but lower surface 1b and/or side 1c may 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 successively constituted laterally across the mode of inner space 10.It is illustrating Example in, coating device 100 have by with exit opening portion 14 outlet side structure 100a with have entrance opening portion The 12 integrated structure of entrance side structure 100b, but the structure for being coated with device 100 is not limited to such example.It is applying Inclined-plane 18 can be arranged as shown in fig. 2 b and fig. 2 c in the entrance side of cloth device 100 around entrance opening portion 12.In addition, with It is connected in the hole 15 (paste entrance hole) of filling paste with inner space 10.

Then, referring to Fig. 3 A, Fig. 3 B and Fig. 3 C.Fig. 3 C is the 3C -3C line sectional view of Fig. 3 A and Fig. 3 B.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 is inserted into 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 magnet 1, But gap as shown in Figure 3A, is provided between exit opening portion 14 and R-T-B based sintered magnet 1.The representativeness in the gap Size t is as shown in Figure 3 C.Typically, the size t in gap is the same along the periphery in exit opening portion 14, 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 magnet 1 Each side have mutually different value.

Side of the entrance opening portion 12 of coating device 100 in this by R-T-B based sintered magnet 1 can slide Formula support, R-T-B based sintered magnet 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 magnet 1 on orthogonal direction (direction in the face XY) movement shapes and sizes.It is typical Ground, the shape and size in the section orthogonal to Z-axis in entrance opening portion 12 can be designed as and R-T-B based sintered magnet 1 The shape and size in section orthogonal to Z-axis are roughly equal.In this way, what entrance opening portion 12 can be designed as being inserted into " positioning " of R-T-B based sintered magnet 1 and the paste for being filled in inner space 10 do not flow out to from entrance opening portion 12 outer The form in portion.In addition, as described later, R-T-B based sintered magnet 1 is not limited to the example relative to the positioning in entrance opening portion 12, Also the progress of other devices can be used.

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 magnet 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 system The shape and size in the section orthogonal to Z-axis of sintered magnet 1, expand outward after being equivalent to the thickness of be coated with paste Shape and size.That is, by the size t in the gap between exit opening portion 14 and R-T-B based sintered magnet 1 come regulation paste The thickness of oxidant layer.Paste layer contains the liquid components such as solvent after rigid coating, but by drying process, liquid component is reduced.Cause This, the thickness of paste layer can change with time going by.

The size of inner space 10 can be determined as value appropriate from various viewpoints.The Z-direction of inner space 10 On be dimensioned to the value smaller than size of each R-T-B based sintered magnet 1 in Z axis direction.This is because in R- When the front end of T-B based sintered magnet 1 is projected into outside from exit opening portion 14, R-T-B system sintering magnetic as shown in Figure 3 C is needed The reason that at least part of body 1 is substantially kept by entrance opening portion 12.Size allusion quotation of the inner space 10 in Z axis direction It can be set as to type R-T-B based sintered magnet 1 in the half of the size of Z-direction hereinafter, can for example 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 causes paste 10 mobility in inner space to reduce.In addition, if the size is more than 50mm, R- The position of the front end of T-B based sintered magnet 1 is easy to change.But the ruler of R-T-B based sintered magnet 1 in the Z-axis direction It is very little it is big in the case where, the structure for limiting the front position of R-T-B based sintered magnet 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 the top of outlet side structure 100a, 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 being connected to multiple paste entrance holes is formed in coating device 100 The flow path of agent imports paste 20 from multiple paste entrance holes in coating device 100.Wherein, in the present invention, by paste 20 The hole (opening portion) for importing inner space 10 is known as " paste entrance hole ".

Then, referring to Fig. 4 (a), (b) and (c).Fig. 4 (a), (b) and (c) schematically show multiple R-T-B system sintering Magnet 1 is sequentially inserted into the entrance opening portion 12 of coating device 100, the side for passing through inner space 10 and being discharged from exit opening portion 14 Formula.Hereinafter, being illustrated while referring to these figures to the example of coating movement.

Firstly, preparing R-T-B based sintered magnet 1, the entrance opening portion of insertion coating device 100 as shown in Fig. 4 (a) 12.Insertion uses magnet feedway (not shown), and R-T- B based sintered magnet 1 is along the arrow direction quilt parallel with Z axis Push the left direction in figure to.R-T-B system is set to be sintered magnetic at this point, the inclined-plane 18 of 100 entrance side of coating device is arranged in It slides and is directed to the center in entrance opening portion 12 in the front end of body 1.R-T-B based sintered magnet 1 passes through inner space 10, It is discharged outward from exit opening portion 14.After painting process starts, before inner space 10 filled by paste, even if by R-T- The insertion coating device 100 of B based sintered magnet 1, does not carry out the coating of paste yet.However, it is preferred to paste is filled into internal sky Between before 10, at least one R-T-B based sintered magnet 1 is inserted into coating device 100 to reduce the opening in exit opening portion 14 Area.

Then, from paste feedway (not shown), by being coated with the hole 15 of device 100, internally paste is filled in space 10 20.Pressure appropriate is applied to paste 20.Fig. 4 (b) is shown schematically in inner space 10 state of paste 20 that is filled with. In inner space 10, paste 20 is contacted with the surface of R-T-B based sintered magnet 1, its surface is coated.By suitably adjusting The movement speed for saving the size t in above-mentioned gap, the pressure of paste, R-T-B based sintered magnet 1 can be controlled and be flowed out from gap To the amount of external paste 20, the coating layer (paste layer 2) of the paste 20 of suitable thickness is formed.The size t in gap for example can It is set in the range of 0.1mm~1mm.Magnet size is bigger, and the thickness of paste layer 2 is thicker, thus preferably.For example, can be in thickness Spend the paste layer 2 for being formed on the R-T-B based sintered magnet 1 of 6mm or so and there is 200~500 μm of left and right thicknesses.

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

As shown in Fig. 4 (c), magnetic is sintered from the R-T-B system that the exit opening portion 14 of coating device 100 is discharged The surface of body 1 forms paste layer 2.The thickness of the paste layer 2 is by the end face from exit opening portion 14 to R-T-B based sintered magnet The size t in the gap between 1 surface is provided.In addition, being inserted into spreader before paste 20 is filled into inner space 10 On the R-T-B based sintered magnet 1 of part 100 most started, the formation of paste layer 2 is realized with being unable to fully sometimes.Such In the case of, at least one R-T-B based sintered magnet 1 after painting process just starts plays prefabrication as coating (dummy) effect.

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

The R-T-B based sintered magnet 1 come out from the exit opening portion 14 of coating device 100 be in its four sides (1a, 1b, The state for 1c) foring paste layer 2, therefore, it is desirable to keep away manual-free or fixture support or hold R-T-B based sintered magnet 1.In In aftermentioned embodiment, for the R-T-B based sintered magnet 1 being discharged from the exit opening portion 14 of coating device 100, gas It pushes and contacts 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 device of R-T-B based sintered magnet 1 for example including to spray from a large amount of apertures The workbench that the mode of air is constituted out.Due to R-T-B based sintered magnet 1 from workbench suspend, so with other objects Under substantial discontiguous state, the dry tack free of paste layer 2.As a result, the layer of powder contained by paste layer 2 can be with basic one The surface (four sides) of the thickness cladding R-T-B based sintered magnet 1 of cause.

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

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

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

Fig. 6 is schematically shown using existing nozzle dispensers 24,84 in the upper surface of R-T-B based sintered magnet 1 The example of 1a and lower surface 1b coating paste layer 2.In this example, firstly, R-T-B based sintered magnet 1 is 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 magnet 1 using nozzle dispensers 24, is formed Paste layer 2c.Keep paste layer 2c sufficiently dry, after it can operate, spins upside down R-T-B based sintered magnet 1.So Afterwards, using nozzle dispensers 84, paste is coated on to the lower surface 1b of R-T-B based sintered magnet 1, forms paste layer 2d.In In the example of Fig. 6, the thickness of the thickness and paste layer 2d of paste layer 2c 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 magnet 1 Another example of the mode of 1a and lower surface 1b coating paste layer 2.It is carried in this embodiment and first by R-T-B based sintered magnet 1 It is placed in the state of workbench 80, paste is coated on to the upper surface of R-T-B based sintered magnet 1 using nozzle dispensers 24 1a forms paste layer 2c.But at this point, keep the thickness of paste layer 2c Dt bigger than design value.Then, it is sintered R-T-B system Magnet 1 is spun upside down.Height of the lower surface 1b of R-T-B based sintered magnet 1 apart from workbench 80 is on close level in paste The aggregate value of the thickness of the thickness and R-T-B based sintered magnet 1 of layer 2c.Compared with the example of Fig. 6, due to paste layer 2c's The big Dt of thickness, so the interval of the lower end of the lower surface 1b of R-T-B based sintered magnet 1 and nozzle dispensers 84 reduces.As a result, When the lower surface 1b that paste is coated on R-T-B based sintered magnet 1 is formed paste layer 2d using nozzle dispensers 84, paste The thickness of layer 2d is Dt smaller than design value.So, the 2 of Dt is generated between the thickness of paste layer 2c and the thickness of paste layer 2d Difference again.

As described above, existing and being difficult to control in the sintering of R-T-B system in the method using existing nozzle dispensers The project of the thickness for the paste layer 2 that the upper surface 1a and lower surface 1b of magnet 1 are formed.In addition, if utilizing above-mentioned existing skill Art is coated with paste in the upper surface 1a and lower surface 1b of R-T-B based sintered magnet 1, and there is also pastes from upper surface 1a and following table Face 1b on laterally (direction vertical with side 1c) a possibility that overflowing.In such a situation, if in R-T-B system Two side 1c of sintered magnet 1 are coated with paste, then paste layer is easy to become near the side of R-T- B based sintered magnet 1 It is thick.In addition, when the side 1c to R-T-B based sintered magnet 1 is coated, if a part of paste is from side 1c Side is overflowed, then the thickness of the paste layer on the side 1c of R-T-B based sintered magnet 1 becomes uneven, it is difficult in R-T-B The side 1c of based sintered magnet 1 is formed uniformly the paste layer of desired thickness.

As described above, using coating device of the invention and coating method, it is able to suppress and such in the prior art can The thickness deviation of the paste layer of generation.Also, it does not both need to spin upside down R-T- B based sintered magnet 1, does not need to turn over yet Paste between sequence of changing a job is dry, can be formed simultaneously coating layer, therefore productivity to 4 faces of R-T-B based sintered magnet 1 It improves.

Fig. 8 schematically shows the R-T-B based sintered magnet 1 that paste layer 2 is coated with using coating device of the invention Another example.R-T-B based sintered magnet 1 in this has the shape of the cuboid of rectangular cross-sectional.Fig. 8 (a), (b) and (c) respectively schematically indicates the top plane view, front elevation and the figure that are coated with the R-T-B based sintered magnet 1 of paste layer 2 8 (a) 8C-8C line sectional view.The R-T-B based sintered magnet 1 of R-T-B based sintered magnet 1 and Fig. 5 of Fig. 8 is main Difference is the shape in the section orthogonal with long axis direction.In the example of hgure 5, section is rectangle.As shown in figure 8, Upper surface 1a, the lower surface 1b and 2 side 1c of R-T-B based sintered magnet 1 are covered by paste layer 2.Design coating device 100 Entrance opening portion 12 and exit opening portion 14 shape and size, comply with the shape and size in such section.

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

< apparatus for coating >

Fig. 9 indicates the major part with the apparatus for coating of above-mentioned coating device.The apparatus for coating includes: for by R- T-B based sintered magnet 1 is 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 for supplying paste 20 to coating device 100.A pair of rolls 30a, 30b mono- While squeezing multiple each R-T-B based sintered magnets 1 from above or below, make its left direction into figure mobile on one side.Roller 30a, 30b may be the mode that each R-T-B based sintered magnet 1 is squeezed from side.By the movement of roller 30a, 30b, multiple R- T-B based sintered magnet 1 is seamlessly supplied to coating device 100.

In addition, the apparatus for coating further includes thick drying device 50, which can be carried on one side from spreader The R-T-B based sintered magnet 1 that the paste coating that part 100 comes out finishes is dried on one side.The thick drying device 50 of diagram is logical Cross at least lower surface that air (gas) is pushed to and contacted each R-T-B based sintered magnet 1 being discharged from coating device 100 Side carries R-T-B based sintered magnet 1 from the suspension of thick drying device 50 slightly.1 quilt of R-T-B based sintered magnet The subsequent promotion of R-T-B based sintered magnet 1 is carried one by one.Also, the upper surface of thick drying device 50 can also be with Inclination.According to magnet shape, the R-T-B based sintered magnet 1 of suspension can be moved using the descent direction of self weight towards inclined surface It is dynamic.

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

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

The other structures example > of < coating device

Coating device 100 in such apparatus for coating is not limited to the device with 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 magnet 1 fill respectively it is different types of The coating device that the mode of 2 layers of paste layer is constituted is formed in multiple inner spaces of paste, on R-T-B based sintered magnet 1 100。

The coating device 100 of Figure 10 includes the addition structure 100c for being used to form the second inner space 16.The addition structure Divine force that created the universe 100c covering includes 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.It is opened with adding outlet of the exit opening portion 17 greater than outlet side structure 100a of structure 100c 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 magnet 1 passes through the first inner space 10, in R-T-B based sintered magnet 1 Surface coating paste 20a and form the first paste layer 2a.Then, pass through the second inner space in R-T-B based sintered magnet 1 When 16, paste 20b is coated 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, thus 3 layers of lamination or more of paste layer.

First paste layer 2a and the second paste layer 2b can be formed from the same material, can also be by different material shapes At.In aftermentioned embodiment, coating includes the powder particle formed by different materials on R-T-B based sintered magnet 1 Paste.It, can be easily in the position close to 1 surface of R-T-B based sintered magnet when using the coating device 100 of Figure 10 Paste of the configuration comprising RLM alloy powder includes RH compound in the position configuration far from 1 surface of R-T-B based sintered magnet The paste of powder.

Figure 11 schematically show R-T-B based sintered magnet 1 do not positioned sufficiently by entrance side structure 100b, R- The unstable example of the posture of T-B based sintered magnet 1.In this example, R-T-B based sintered magnet 1 is in inner space 10 Middle inclination.Therefore, the thickness of positional shift of the R-T-B based sintered magnet 1 relative to exit opening portion 14, paste layer 2 deviates Design value and become uneven.

Figure 12 is the figure for indicating not occur the improvement example of the mode of positional shift as described above.In the coating device of Figure 12 In 100, the position in exit opening portion 14 is provided with multiple restriction components 104.These limit component 104 respectively from exit opening The periphery in portion 14 is prominent to center, and the front end for limiting component 104 limits the position of R-T-B based sintered magnet 1.Limit component 104 partly contact with the surface of R-T-B based sintered magnet 1, can be relatively sliding relative to R-T-B based sintered magnet 1 It is dynamic.Therefore, the surface of R-T-B based sintered magnet 1 and the interval of the periphery in exit opening portion 14 are maintained evenly, and eliminate paste The thickness of oxidant layer 2 substantially deviates the phenomenon that design value.

Figure 13 is shown schematically in the ribbon that a part of the paste layer 2 of covering R-T-B based sintered magnet 1 is formed Recess portion 22.The recess portion 22 of paste layer 2 is not carry out the part of paste coating due to limiting the presence of component 104.But As shown in figure 13, R-T-B based sintered magnet 1 is after the coating discharge of device 100, since the paste layer 2 before drying contains liquid Ingredient, therefore Rapid Expansion due to surface tension.The ruler that the can ignore that as a result, recess portion 22 of paste layer 2 disappears or is contracted to It is very little.It is preferred that reducing the width of recess portion 22, therefore each width for limiting component 104 can be set as the big of such as 0.2~1mm or so It is small.

Component 104 is limited when the surface of R-T-B based sintered magnet 1 is slided, magnetic may be sintered in R-T-B system The surface of body 1 forms small scar or shallow groove.But since the surface of R-T-B based sintered magnet 1 is eventually by grinding Mill etc. is processed, therefore the formation of small scar or shallow groove will not cause adverse effect to final magnet characteristics.

In addition, limiting the periphery that exit opening portion 14 is necessarily arranged in component 104, also can be set in outlet side structure The other positions of object 100a.

Figure 14 indicates that exit opening portion 14 is provided with the structural example of the conical surface 105.Such conical surface 105 if it exists, is being pasted When agent flows to exit opening portion 17, what generation substantially equally squeezed it around the front end of R-T-B based sintered magnet 1 Power.Therefore, even if R-T-B based sintered magnet 1 tilts in inner space 10, the paste squeezed by the conical surface also can be by R-T In the position correction of-B based sintered magnet 1 to appropriate range.

Figure 15 indicates 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 the entrance opening portion 12 of entrance side structure 100b.Tool For body, anti-backflow device 120 to cover the entrance opening portion 12 of entrance side structure 100b, externally to anti-backflow device It is formed by gap (sealed chamber) between 120 and entrance side structure 100b receives the mode of air and constitutes.Anti-backflow device 120 With the opening portion 19 for passing through R-T-B based sintered magnet 1.If the hypertonia of air, it may cause air and enter filling It is empty in the inner space 10 of paste 20, but via the gap being present between opening portion 19 and R-T-B based sintered magnet 1 Gas can prevent the pressure of air from becoming excessively high to external leakage.

The structural example > of < apparatus for coating

Referring to Fig.1 6, the structural example of apparatus for coating is illustrated.

The apparatus for coating of diagram has above-mentioned any coating device.The apparatus for coating is included for by R-T-B system A pair of rolls 30a, 30b and be used to supply R-T-B system to roller 30a, 30b that sintered magnet 1 is sequentially inserted into coating device 100 The transmission device 64 of sintered magnet 1.Transmission device 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 magnet 1 in glassware 60 is put into cylinder 62 and is pushed on transmission device 64.By accumulator 60 and investment cylinder 62 Constitute loader.The R-T-B based sintered magnet 1 loaded on conveyer belt 64c is rotated with the rotation by roller 64a, 64b Conveyer belt 64c is mobile to coating device 100 together.It is clipped in R-T-B based sintered magnet 1 between a pair of rolls 30a, 30b successively It is inserted into coating device 100, is supplied to painting process.Roller 30a, 30b from clamping each R-T-B based sintered magnet 1 up and down, The entrance opening portion 12 of coating device 100 can be reliably inserted.Loading part is with R-T-B based sintered magnet 1 to coating The continual mode of the supply of device 100 will be on R-T-B based sintered magnet 1 sustainable supply to transmission device 64.

Then, referring to Fig.1 7.As shown in figure 17, the R-T- B based sintered magnet 1 being discharged from coating device 100 is 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, can also So that the temperature of the air of blowout is higher than room temperature.Then, R-T-B based sintered magnet 1 is moved to main drying device 70, there The standby necessary time carries 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 R-T-B based sintered magnet 1 of the paste layer 2 after sufficiently dry, using a pair of of pinch roller 72 from dry in trunk Standby multiple R-T-B based sintered magnets 1 in connection status one by one are cut into individually on device 70, are then led to Discharge chute 74 is crossed to be discharged from apparatus for coating.The tangential direction speed of pinch roller 72, i.e. revolving circumferential velocity regulation sandwich pinch The movement speed of the R-T-B based sintered magnet 1 of roller 72.The movement speed is set to the conveyer belt 70c than main drying device 70 Movement speed it is high.It, can be from standby on main drying device 70 by the movement of the pressure roller 70d of main drying device 70 In multiple R-T-B based sintered magnets 1 of connection status one by one, the R-T-B system clipped by pinch roller 72 is sintered magnetic Body 1 is cut.

The structural example > of the thick drying device of <

Firstly, referring to Fig.1 8.Figure 18 schematically shows the section perpendicular to Z-direction of thick drying device.

Embodiment according to the present invention, with the state that is covered around R-T-B based sintered magnet 1 by paste layer 2 from Device 100 is coated with to be discharged.Since the paste layer 2 after being just discharged is not dried, if R-T-B based sintered magnet 1 directly put Hold on a moving belt or with manpower or fixture, then may cause paste layer 2 will have local variations in thickness or paste layer 2 one It peels off part.Thick drying device 50 shown in Figure 18 include 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 for additional air to be discharged to external slit-shaped.

Hole 52a is constituted in a manner of blow out air, is lifted with resisting the gravity of R-T-B based sintered magnet 1.This The width of hole 52a in embodiment for example can be 1mm.Hole 52b is configured to blow out from side direction center for will be by air It lifts and the position of R-T-B based sintered magnet 1 that suspends is adjusted to air near center.Hole 52b in present embodiment Width can be for example the value in the range of 0.5~3mm.In order to be formed in the upper table of R-T-B based sintered magnet 1 The air-flow of face or lower surface flowing can keep R-T- with the position of the width of appropriate adjustment hole 52b and short transverse to stablize The posture of B based sintered magnet 1.For air is discharged to the width of the opening portion 56 of external slit-shaped for example, it can be set to In the range of 1mm~10mm.

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

Shape, size and the number of hole 52a, 52b are not limited to 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 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 magnet 1 One side flow direction top, it is horizontal to cannot keep R-T-B based sintered magnet 1 sometimes.It is therefore preferable that setting will from hole 52a, The air that 52b sprays is discharged to the opening portion 56 outside device.

When using other structures instead of the such opening portion 56 of setting, it can also make R-T-B based sintered magnet 1 Stable posture.

Figure 20 is the sectional view for schematically showing another structural example of thick drying device 50.Thick drying in the example The upper surface (face opposite with R-T-B based sintered magnet 1) of device 50 tilts such as 0.5~3 degree left side relative to horizontal direction It is right.That is, the normal of the upper surface relative to thick drying device 50 slightly rotates in the face XY from Y direction to X-direction.Pass through Such inclination, the R-T-B based sintered magnet 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 blowout, in this way, the position of the R-T-B based sintered magnet 1 of suspended state in the X-axis direction is stablized, The posture of R-T-B based sintered magnet 1 is also appropriately adjusted.

Figure 21 is the sectional view for schematically showing another structural example of thick drying device 50.Thick drying in the example The upper surface (face opposite with R-T-B based sintered magnet 1) of device 50 is bent in a manner of concavity.That is, in this way Bending, the R-T-B based sintered magnet 1 of suspended state bears towards the power near center.In this way, the R- of suspended state The position of T-B based sintered magnet 1 in the X-axis direction is stablized, and the posture of R-T-B based sintered magnet 1 is also appropriately adjusted.

The change example > of < coating device

Figure 22 is to indicate that internally space 10 imports the coating device of paste for out of coating device 100 multiple holes for being formed The figure of 100 structural example.Figure 23 A is the line A-A figure for importing Figure 22 in the example that the number in the hole of paste is 2.Equally, scheme 23B and Figure 23 C is the line B-B figure and line C-C figure for importing Figure 22 in the example that the number in the hole of paste is 2 respectively.

The coating device of Figure 22 includes: the entrance side structure 100b with entrance opening portion 12；With exit opening portion 14 stipulated that inner space 10 outlet side structure 100a；Be located at entrance side structure 100b and outlet side structure 100a Between, and there is the intermediate plate 130 for the magnet through hole 134 for passing sequentially through multiple R-T-B based sintered magnets.It is intermediate Plate 130 has paste through hole 132a, 132b for passing through paste.

Entrance side structure 100b shown in Figure 23 A has the recess portion shape from opening to the side to connect with intermediate plate 130 At the first slot 140.In the example of figure, the first slot 140 imports the hole 15 ' being coated in device 100 by outside from by paste Position extends along the face parallel with the face XY, and 2 are divided into halfway.The branch portion of first slot 140 is the two of entrance opening portion 12 The lateral edge direction parallel with Y axis direction extends.The depth (depth of recess portion) of first slot 140 is less than entrance side structure 100b Thickness.First paste flow path 145 is provided by the space that the first slot 140 and intermediate plate 130 clip.

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

Intermediate plate 130 shown in Figure 23 B has 2 pastes for being connected to the first paste flow path 145 with the second paste flow path 155 Agent through hole 132a, 132b.The number for being set to the paste through hole of intermediate plate 130 is not limited to 2, or and 1, but it is excellent It is selected as multiple.

Second paste flow path 155 is empty by multiple hole (paste entrance hole) 15a, 15b that different location is arranged in and inside Between 10 connection.

The paste that the hole 15 ' of the entrance side structure 100b shown in Figure 23 A imports circulates in the first paste flow path 145, Fill the inside of the first paste flow path 145.The paste inside the first paste flow path 145 is filled in pass through among shown in Figure 23 B Paste through hole 132a, 132b of plate 130 flows into the second paste flow path 155 of outlet side structure 100a shown in Figure 23 C It is interior.The paste flowed into the second paste flow path 155 pass through respectively multiple paste entrance hole 15a, 15b import inner space 10 it In.Paste entrance hole is for example with the diameter of 1~20mm.

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

The intermediate plate 130 of entrance side structure 100b and Figure 24 B of Figure 24 A is respectively provided with the entrance side structure with Figure 23 A The construction of the intermediate plate 130 of object 100b and Figure 23 B similarly constructs.Difference is outlet side structure shown in Figure 24 C The construction of 100a.The outlet side structure 100a of Figure 24 C also has the second slot 150, by between intermediate plate 130 and the second slot 150 Space provide the second paste flow path 155.The characteristic point of this is that the paste flowed into the second paste flow path 155 passes through 4 Each hole for locating paste entrance hole 15a, 15b, 15c, 15d imports among inner space 10.If paste is imported inner space 10 Hole 1 number increase, even if then paste supply amount changes, influence also dispersed.As a result, it is possible to reduce by being coated with institute The uneven thickness of the paste layer of formation.

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

The change example > of < apparatus for coating

As shown in figure 25, if transmission device 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 magnet 1 relative to the entrance opening portion 12 of coating device 100 Angle offset.When R-T-B based sintered magnet 1 is 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 offset of position and/or entry angle is easy to increase.If Such offset is generated, 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 Set and/or the precision of entry angle will have a direct impact on paste layer 2 thickness precision, so needing high precision.Entrance opening The influence of the offset of the position and/or entry angle in portion 12 has in R-T-B based sintered magnet 1 to be extended on long axis direction It is obvious when longer shape.

Figure 26 has been expressed as inhibiting such positional shift and having the function of playing the reference block as positioning mechanism The figure of the structural example of 35 apparatus for coating.Positioning datum block 35 has for limiting the R-T-B system sent from transmission device 64 The upper surface (sliding surface) of the movement of the up and down direction (Y-direction) of sintered magnet 1.Positioning datum block 35 for example passes through machining The precision for forming height and angle, by being pressed R-T-B based sintered magnet 1 on positioning datum block 35 with roller, with high Intensive qualifications enter position and the entry angle of the R-T-B based sintered magnet 1 in entrance opening portion 12.In addition, in addition to the positioning Except block 35, the left and right directions (X-direction) relative to direction of travel for limiting R-T-B based sintered magnet 1 can also be set The other locating piece and roller of movement.For limiting the positioning datum block of the movement of up and down direction (Y-direction) and for limiting a left side The locating piece of the movement of right direction (X-direction) can be integrated.I.e., it is possible to which the positioning of the movement for limiting the direction XY is arranged The roller of block and corresponding all directions.

1 one side of R-T-B based sintered magnet is pressed lightly on by roller in the upper surface of positioning datum block 35, on one side in spreader It is with the precision level of high position and entry angle mobile among the entrance opening portion 12 of part 100.Positioning datum block 35 it is upper The position of the up and down direction on surface can correspondingly be adjusted with the position of the up and down direction in the entrance opening portion 12 in coating device 1 It is whole.In addition, above-mentioned is (not shown) for limiting the position energy of the left and right directions of the locating piece of the movement of left and right directions (X-direction) Enough positions with the left and right directions in the entrance opening portion 12 of coating device 1 correspondingly adjust.In the example of Figure 26, positioning datum The upper surface of block 35 is horizontal, but in the case where being coated with the inclined situation of device 100 itself because of certain purposes, also can be with coating device 100 inclination accordingly tilts the upper surface of reference block 35, to make entry angle and be coated with the tilt angle of device 100 Match.

Figure 27 is the figure for indicating another structural example of coating device 100 of the invention.In the coating device 100, by Inner space 10 as defined in outlet side structure 100a, on the direction (Z-direction) that R-T- B based sintered magnet 1 passes through, More than half 3/4ths size below of length with each R-T-B based sintered magnet 1.For example, inner space 10 2mm or more is dimensioned in Z-direction, in typical example in the range of 4~90mm.

In the example of Figure 27, the front end of R-T-B based sintered magnet 1 is temporarily entirely buried in the inside of paste, is formed Float on the state in paste.Then, it with the gap turn narrow of inner space, by bigger dynamic pressure, is achieved in placed in the middle (centering).The inner space 10 of Figure 27 has the temporary paste for realizing each R-T-B based sintered magnet 1 as described above The size (more than half of the size of R-T-B based sintered magnet 1) of interior suspension.At if R-T-B based sintered magnet 1 is whole In floating on the state in paste completely, then it is difficult to play by 105 bring centering effect of the conical surface, therefore the ruler of inner space 10 3/4ths or less the very little preferably sizes of R-T-B based sintered magnet 1.That is, it is preferred that before R-T-B based sintered magnet 1 When holding in internally positioned space 10, outside the internally positioned space 10 in the rear end of R-T-B based sintered magnet 1.Additionally, it is preferred that by foot Enough the long conical surface 105 forms appropriately sized dynamic pressure to R-T-B based sintered magnet 1 on the move, so that in suspension The front end of R-T-B based sintered magnet 1 does not settle in paste.The conical surface 105 is dimensioned to internal sky in the Z-axis direction Between 10 size in the Z-axis direction 1/20th or more, preferred three points of size of the inner space 10 in Z axis direction One of more than, more preferably more than half.Size of the inner space 10 in Z axis direction can be identical, that is, inner space 10 is whole Body can be formed by the conical surface.

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 the example of Figure 21, with the shorter recess shapes of radius of curvature, with the curved of the R-T-B based sintered magnet 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 magnet 1 and thick drying device The radius of curvature of 50 recess portion is necessarily consistent.Focus in end 55a, the flexure plane of R-T-B based sintered magnet 1 with The gap of the recess portion of thick drying device 50 is opposite to shorten.The shortening in gap in this way is able to suppress air from R-T-B system The two sides of sintered magnet are revealed, and realize carrying appropriate.

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

[R-T-B based sintered magnet base material]

Firstly, in the present invention, the diffusion couple as heavy rare earth element RH is as it is female to prepare R-T-B based sintered magnet Material.Wherein, in the present specification, for easy understanding, sometimes by the R-T-B system as the diffusion couple elephant of heavy rare earth element RH Sintered magnet is exactly known as R-T-B based sintered magnet base material, but the term of " R-T-B based sintered magnet " also includes this " the R-T-B based sintered magnet base material " of sample.The R-T-B based sintered magnet base material is able to use well known material, has example Such as composition below.

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

T (transition metal element based on Fe, may include Co) and inevitable impurity: remainder

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

The R-T-B based sintered magnet base material of above-mentioned composition can be manufactured by arbitrary manufacturing method.

[paste]

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

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

Spreading aids typically can be the powder of RLM alloy.Wherein, as RL, it is suitble to the effect for restoring RH compound The high light rare earth elements of fruit, RL are Nd and/or Pr.M is selected from one or more of Cu, Fe, Ga, Co, Ni, Al.As diffusion When the materials'use Nd-Cu alloy and/or Nd-Al alloy of auxiliary agent, RH compound brought by Nd can be effectively played Reducing power, H_cJImprovement effect it is higher.In addition, RLM alloy contains the RL of 50 atom % or more in certain embodiment, and And its fusing point is heat treatment temperature or less.The granularity of the powder of RLM alloy be preferably 150 μm hereinafter, more preferably 100 μm with Under.It is easy to oxidize in the undersized of RLM alloy powder, from the viewpoint of preventing oxidation, the granularity of RLM alloy powder Lower limit be 5 μm or so.The typical case of the granularity of the powder of RLM alloy is 20~100 μm.

The content ratio of RL is in the RLM alloy of 50 atom % or more, and the ability that RL restores RH compound is high, and fusing point Below heat treatment temperature.Therefore, it melts, efficiently restores RH compound, with what is be reduced more at high proportion in heat treatment RH is spread in R-T-B based sintered magnet base material, even if on a small quantity, also can efficiently make the H of R-T-B based sintered magnet_cJ It improves.In certain embodiment, RLM alloy contains the RL of 65 atom % or more.

Paste can by above-mentioned RH compound powder and RLM alloy powder mixed adhesive, water and/or solvent come Production.Solvent for example can be organic solvent.Due to the coating weight and H of RLM alloy powder_cJThe degree of raising is not directly relevant to, Therefore there is no problem generating a little bias due to gravity or surface tension.Wherein, as long as adhesive and solvent are at it Fusing point in the temperature-rise period of heat treatment afterwards in RLM alloy temperature below occur thermal decomposition or evaporation and from R-T-B system The surface of sintered magnet removes, and type is not particularly limited.

Embodiment according to the present invention is wanted for being coated on the paste on surface of R-T-B based sintered magnet base material It asks from the uniformity that coating layer shape is similarly shunk, ensured during being applied to drying.In the weight for improving adhesive or powder When ratio, the viscosity of paste increases, therefore the ability of the shape of coating layer is maintained to improve.In addition, containing low boiling point in paste When solvent (alcohol or water), dry required time cripetura, therefore the shape of coating layer is also easy to maintain.

[paste coating]

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

By painting process, the powder of the RH compound as diffusant and the RLM alloy powder one as spreading aids It rises and is configured in magnet surface.At this point it is possible to be formed in first paste of the magnet surface coating comprising RLM alloy powder particle First paste layer, later, coating includes the second paste of RH compound and forms the second paste layer on first layer.

RLM alloy contained by paste due to its fusing point in heat treatment temperature hereinafter, so being melted in heat treatment, thus shape The RH that the efficiency of Cheng Yigao is reduced readily diffuses into the state inside R-T-B based sintered magnet.It therefore, there is no need to make The powder of RLM alloy and the powder of RH compound are present in front of the surface of R-T-B based sintered magnet, burn to R-T-B system The surface for tying magnet carries out the special cleaning treatments such as pickling.Certainly the feelings for carrying out such cleaning treatment are not precluded Condition.

RH compound contained by the layer of paste in the surface of R-T-B based sintered magnet base material there are ratios (at heat Before reason) the RLM alloy in terms of quality ratio: RH compound=9.6:0.4~5:5.It is more preferably RLM alloy: RH there are ratio Compound=9.5:0.5~6:4.

The paste of the powder (third powder) other than powder of the coating comprising RLM alloy and RH compound is not precluded in the present invention Agent etc. is the case where there are third powder on the surface of R-T-B based sintered magnet base material, but it should be noted that third powder cannot hamper The RH in RH compound is hindered to spread to the inside of R- T-B based sintered magnet base material.The powder of " RLM alloy and RH compound " Shared quality ratio wishes to be 70% or more in the whole powder existing for the surface of R-T-B based sintered magnet base material.

In accordance with the invention it is possible to effectively improve the H of R-T-B based sintered magnet with a small amount of RH_cJ.In R-T-B system The every 1mm of the preferred magnet surface of the amount of RH existing for the surface of sintered magnet²For 0.03~0.35mg, more preferably 0.05~ 0.25mg。

[diffusion heat treatments]

In the present invention, the powder of the powder of RLM alloy and RH compound contained in paste is present in R-T-B system It is heat-treated in the state of the surface of sintered magnet base material.In addition, after heat treatment starts, since the powder of RLM alloy is molten Melt, so not needing the state that RLM alloy is always maintained to " powder " in heat treatment.The preferred vacuum of the atmosphere of heat treatment or Inactive gas atmosphere.Heat treatment temperature be the sintering temperature of R-T-B based sintered magnet or less (it is specific be, for example, 1000 DEG C with Under) and be higher than RLM alloy fusing point temperature.Heat treatment time is, for example, 10 minutes~72 hours.In addition, in above-mentioned heat It can according to need the heat treatment further carried out at 400~700 DEG C 10 minutes~72 hours 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 magnet base material Example.Apparatus for coating of the invention can be used in the surface in various magnet base materials formed the paste layer of powder, make it is desired Method inside elements diffusion to magnet base material.

Embodiment

Using the device and method with coating device shown in Fig. 4, paste is carried out to R-T-B based sintered magnet base material Coating.

Used R-T-B based sintered magnet base material has shape shown in FIG. 1, having a size of X-direction 28.4mm, Y Direction 6.88mm, Z-direction 32.3mm, upper surface R 30.2mm.The group of R-T-B based sintered magnet base material becomes Nd= 13.4, B=5.8, Al=0.5, Cu=0.1, Co=1.1, remainder=Fe (atom %), magnetic characteristic are shown by B-H Track device measures, as a result H_cJFor 1035kA/m, B_rFor 1.45T.

The composition of used paste are as follows: diffusant (10 μm of granularity commercially available TbF below₃(at. ratio) powder) and expand Dissipate auxiliary agent (100 μm of the granularity spherical Nd below made by centrifugal atomization₇₀Cu₃₀(at. ratio) powder) it is mixed with mass ratio 8:2 80 mass % of mixed-powder, 4 mass % of polyvinyl alcohol made of conjunction, 16 mass % of water.

In this way, 4 faces of the coating weight cladding R-T-B based sintered magnet base material recorded with table 1, are dried process, Make the sample of No.1~3.Time needed for painting process for 1 R-T-B based sintered magnet base material is 0.3 second left side It is right.

Figure 29 A indicates the section of the sample No.2 after drying process.By Figure 29 A it is found that foring thickness base in 4 faces This uniform paste layer.

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

Using the magnetic characteristic of B-H tracer measurement sample A~E, H is found out to sample A_cJAnd B_rVariable quantity, to sample B ~E finds out H_cJVariable quantity (not to sample B~E measure B_rIt is small, the low-down reason of measurement accuracy because of sample).It will knot Fruit is shown in table 2 and table 3.As shown in Table 2, in the whole samples of No.1~3, B_rAll H almost without reduction_cJIt greatly improves. In addition, as shown in Table 3, the H of each sample B~E_cJIt roughly equally improves, does not see the coating thickness of adjoint paste layer not Big deviation caused by uniformly.In addition, sample B~E is the measurement sample near magnet surface, therefore the Tb's spread is dense Degree is higher nearby than magnet center, so H_cJIt is higher than sample A.In addition, sample D, E of side are also arrived close to upper and lower surface From the influence of the diffusion of upper and lower surface, therefore H_cJSample B, C than upper surface, lower surface is slightly higher.

[table 1]

[table 2]

[table 3]

Industrial availability

Using embodiments of the present invention, can multiple faces to R-T-B based sintered magnet be coated with simultaneously comprising being used for Carry out the paste of the powder particle of the modification of R-T-B based sintered magnet.Thus, for example, supplying that heavy rare earth element RH effectively The production for the method for being given to R-T-B based sintered magnet and spreading it improves.

Symbol description

1:R-T-B based sintered magnet；The upper surface of 1a:R-T-B based sintered magnet；1b:R-T-B system is sintered magnetic The lower surface of body；The side of 1c:R-T-B based sintered magnet；The front end face of 1d:R-T-B based sintered magnet；1e:R-T- The rear end face of B based sintered magnet；2: paste layer；10: inner space；12: entrance opening portion；14: exit opening portion；15: hole； 16: the second inner spaces；18: inclined-plane；19: the opening portion of anti-backflow device；20: paste；50: thick drying device；52a, 52b: Multiple holes；54: receiving the opening portion of air supply；56: air is discharged to external opening portion；100: coating device；100a: Outlet side structure；100b: entrance side structure；100c: additional structure；104: limiting component；105: the conical surface；120: anti- Backflow device；122: sealed chamber.

Claims

1. a kind of manufacturing method of R-T-B based sintered magnet, wherein R is rare earth element, and T is the transition metal based on Fe Element, B are boron, which is characterised by comprising:

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

In the respective upper surface of the multiple R-T-B based sintered magnet, 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

To the process for being coated with the R-T-B based sintered magnet after the paste and being heat-treated in sintering temperature temperature below,

The process for being coated with the paste includes:

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

The paste is filled in the inner space of the coating device, makes to move in the paste and the inner space The upper surface of R-T-B based sintered magnet, lower surface and side contact process.

2. the manufacturing method of R-T-B based sintered magnet as described in claim 1, it is characterised in that:

At inner space of the R-T-B based sintered magnet by the coating device, the entrance opening portion will be described R-T-B based sintered magnet is supported in a manner of it can slide, and has the institute limited on the direction with the quadrature transverse State the shapes and sizes of the movement of R-T-B based sintered magnet.

3. the manufacturing method of R-T-B based sintered magnet as claimed in claim 1 or 2, it is characterised in that:

The shape of the thickness for the paste that there is regulation to be coated on the R-T-B based sintered magnet in the exit opening portion And size.

4. the manufacturing method of R-T-B based sintered magnet as claimed in claim 1 or 2, it is characterised in that:

Include: to the coating device process that successively supplies the multiple R-T-B based sintered magnet

In the process that the entrance opening portion is inserted into each R-T-B based sintered magnet；With

The rear end face that a part is inserted into the R-T-B based sintered magnet in the entrance opening portion is burnt by another R-T-B system The front end face of knot magnet pushes in the cross direction, another described R-T-B based sintered magnet is inserted into the entrance opening The process in portion.

5. the manufacturing method of R-T-B based sintered magnet as claimed in claim 1 or 2 characterized by comprising

Gas is pushed on one side and is contacted from each R-T-B system that the exit opening portion of the coating device is discharged to be sintered magnetic At least described lower surface of body, carries the process of the R-T-B based sintered magnet on one side.

6. the manufacturing method of R-T-B based sintered magnet as claimed in claim 1 or 2 characterized by comprising

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 individual R-T-B based sintered magnet.

7. the manufacturing method of R-T-B based sintered magnet as claimed in claim 1 or 2, it is characterised in that:

The powder particle includes the particle of RLM alloy powder and the powder particle of RH compound, wherein and RL is Nd and/or Pr, M is the element selected from one or more of Cu, Fe, Ga, Co, Ni, Al, and RH is Dy and/or Tb, and RH compound is RH fluoride, RH It is at least one kind of in oxygen fluoride and RH oxide.

8. the manufacturing method of R-T-B based sintered magnet as claimed in claim 7, it is characterised in that:

The RLM alloy contains the RL of 50 atom % or more, and the fusing point of the RLM alloy the heat treatment temperature with Under.

9. the manufacturing method of R-T-B based sintered magnet as claimed in claim 7, it is characterised in that:

The quality ratio of the powder of the RLM alloy powder and the RH compound in the paste is RLM alloy: RH chemical combination Object=9.6:0.4~5:5.

10. a kind of coating device, it is characterised in that:

It includes heavy rare earth element RH that it, which is in the coating of 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 used in be coated with device, wherein R is rare earth member Element, T are the transition metal element based on Fe, and B is boron, and RH is Dy and/or Tb,

The coating device includes:

Fill the inner space of the paste；With

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

11. coating device as claimed in claim 10, it is characterised in that:

The entrance opening portion supports the R-T-B based sintered magnet in a manner of it can slide, and have limit with The shapes and sizes of the movement of the R-T-B based sintered magnet on the direction of the quadrature transverse.

12. coating device as described in claim 10 or 11 characterized by comprising

Filling and the type 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 constitutes of mode,

The second outlet opening portion has the paste that is coated on the R-T-B based sintered magnet of regulation and described the The shapes and sizes of total thickness of two pastes.

13. coating device as described in claim 10 or 11 characterized by comprising

At least one that the R-T-B based sintered magnet is limited relative to the position in the exit opening portion limits component.

14. coating device as described in claim 10 or 11, it is characterised in that:

It is provided with around the entrance opening portion for the R-T-B based sintered magnet to be oriented to the entrance opening portion Inclination.

15. coating device as described in claim 10 or 11, 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 squeezes the R- from surrounding T-B based sintered magnet.

16. coating device as described in claim 10 or 11, it is characterised in that:

Further include: inhibit the paste from the R-T-B based sintered magnet and institute being inserted into 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 pressurize using the gas being externally supplied to the entrance opening portion.

17. coating device as described in claim 10 or 11, it is characterised in that:

The inner space has each R-T-B based sintered magnet on the direction that the R-T-B based sintered magnet passes through More than half 3/4ths size below of length.

18. coating device as described in claim 10 or 11, it is characterised in that:

With the multiple paste entrance holes being connected to the inner space.

19. coating device as described in claim 10 or 11 characterized by comprising

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, has the multiple R-T-B system is made to be sintered magnetic The intermediate plate for the magnet through hole that body passes sequentially through,

The entrance side structure has the first slot, provides the first paste flow path by first slot and the intermediate plate,

The outlet side structure has the second slot, provides the second paste flow path by second slot and the intermediate plate,

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

The second paste flow path forms the multiple paste entrance holes being connected to the inner space.

20. a kind of apparatus for coating characterized by comprising

Coating device described in 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 magnet is sequentially inserted into the magnet feedway in the entrance opening portion；With

Gas is pushed on one side and is contacted from each R-T-B system that the exit opening portion of the coating device is discharged to be sintered magnetic At least described lower surface of body, the device for carrying the R-T-B based sintered magnet on one side.

21. apparatus for coating as claimed in claim 20, it is characterised in that:

The magnet feedway further includes positioning mechanism, and the positioning mechanism, which has, makes the multiple R-T-B system be sintered magnetic The face that body successively slides adjusts position of each R-T-B based sintered magnet relative to the entrance opening portion of the coating device It sets.