CN1803337A - Method and producing device for making rapidly solidified alloy for magnet - Google Patents
Method and producing device for making rapidly solidified alloy for magnet Download PDFInfo
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- CN1803337A CN1803337A CN 200510127893 CN200510127893A CN1803337A CN 1803337 A CN1803337 A CN 1803337A CN 200510127893 CN200510127893 CN 200510127893 CN 200510127893 A CN200510127893 A CN 200510127893A CN 1803337 A CN1803337 A CN 1803337A
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Abstract
The present invention relates to a method of making rapidly solidified alloy for magnet, which including: the step of repairing alloy melt, and the cooling step of bring the melt into contact with the surface of a rotatin gchill roller to rapidly cool and solidify the alloy. Said cooling step includes supplying said melt to the guide member, of which the guide surface defines a tilt angle with a horizontal plane, and then supplying the melt on the guide surface to the contact area on the surface of the chill roller through tubular hole. The distance between the front end of the tubular hole and the surface of the chill roller is 1mm-50mm.
Description
This case is
On April 24th, 2003, application number is
03122188.2, denomination of invention is
Magnet is with anxious The manufacture method of cold alloyDivide an application
Technical field
The present invention relates to comprise manufacture method and the manufacturing installation of the magnet of the operation that makes alloy liquation quench solidification with alloy.
Particularly, the manufacturing of the raw alloy that the Nanocomposite magnet that the present invention relates in various motors, measuring appliance, sensor and loudspeaker etc. to use is used, in more detail, relate to as the iron-based boride of soft magnetism phase or iron with as hard magnetic R mutually
2Fe
14Type B compound (R is a rare earth element) carries out the manufacture method of the quick cooling alloy that uses in the manufacturing of the Nanocomposite magnet that magnetic knot closes.Moreover, use the purposes of the quick cooling alloy that manufacture method of the present invention makes, be not limited to Nanocomposite magnet usefulness, also be suitable as bonded permanent magnet (comprising rubber magnet) or sintered magnet and use.
In addition, the present invention relates to magnet powder of making by above-mentioned quick cooling alloy or the magnet of making by this magnet powder.
Background technology
Now, as the R-Fe-B series magnet, developing R
2Fe
14Hard magnetics such as B phase and Fe
3B (comprises Fe
3.5B) or soft magnetism such as α-Fe alternate to interact and have the Nanocomposite magnet of the institutional framework that magnetic knot closes.The powder of Nanocomposite magnet is fixed into the shape of regulation by using resin, uses as isotropic bonded magnet.
When making Nanocomposite magnet, initiation material often uses the quench solidification alloy that has amorphous microstructure or comprise amorphous microstructure (below, be called " quick cooling alloy ").This quick cooling alloy is by heat treatment generation crystallization, becomes finally that to have the average crystallite particle diameter be 10
-9M～10
-6The permanent magnet material of the nano combined tissue about m.
Alloy organizing structure after the crystallization heat treatment exists with ... the institutional framework of the quick cooling alloy before the crystallization heat treatment greatly.Therefore, how to select to determine the chilling condition etc. of alloy liquation of the institutional framework (ratio of amorphous state phase etc.) of quick cooling alloy, having on the Nanocomposite magnet of good magnetic in making is important.
At present, as the method for making the quick cooling alloy that contains the above-mentioned amorphous state phase of picture in a large number, the known quick cooling method that the use described device of Fig. 1 (spray to cast device) is arranged.This method has the nozzle in the aperture below the internal diameter 1mm from the bottom, the alloy liquation is injected on the chill roll that is rotated, and makes the solidified superalloy of the thin ribbon shaped that amorphous material takes place by making alloy liquation chilling.
About such method, up to the present,, research and report have been finished by the university or the office of research magnetic material.But, device as used herein, the alloy in nozzle about fusing number gram～hundreds of grams, but be the device of the experimental size that sprays, the few device for the treatment of capacity can not be produced the raw alloy that Nanocomposite magnet is used in a large number like this.
Though be not magnet alloy usefulness, a plurality of devices that are used for the alloy liquation is ejected into the nozzle on the chill roll are set, for example be documented in patent documentation 1～8 grade.
After these methods, the alloy liquation that will melt in calciner are infused in the bottom and have in the container of nozzle, by the liquation in the container is applied certain pressure, make liquation from nozzle to the jet surface of rotation roller (below, this method is called " spray to cast method ").Like this, on one side pressurization, on one side by the nozzle ejection liquation, can be injected in near vertical near the topmost that rotates roller having faster the bar of the liquation of flow velocity (stream of liquation).The liquation that has sprayed forms liquid hole (puddle) in the back, surface of the chill roll that rotates with higher speed (for example the roller peripheral speed is more than the 20m/s), and the roller contact-making surface that this liquid is cheated is made the quick cooling alloy of thin ribbon shaped by chilling.
Above-mentioned spray to cast method, the contact length of alloy liquation and rotation roller is short, and therefore chilling is not finished on the rotation roller, the alloy of the condition of high temperature (for example 700 ℃～900 ℃) after peeling off from the rotation roller, thin thickness (it is following to be typically 40 μ m), thereby awing more effectively cooled off.The spray to cast method by carrying out such refrigerating work procedure, realizes the amorphous material of various alloys.
In addition, the applicant has disclosed the method that adopts thin strip casting manufactured Nanocomposite magnet in patent documentation 9, patent documentation 10.Known thin strip casting device or the method for using tundish for example in patent documentation 11 and patent documentation 12, have been put down in writing.
Patent documentation 1
Te Kaiping 2-179803 communique
Te Kaiping 2-247304 communique
Patent documentation 3
Te Kaiping 2-247305 communique
Patent documentation 4
Te Kaiping 2-247306 communique
Patent documentation 5
Te Kaiping 2-247307 communique
Patent documentation 6
Te Kaiping 2-247308 communique
Patent documentation 7
Te Kaiping 2-247309 communique
Te Kaiping 2-247310 communique
Patent documentation 9
Specially permit specification No. 3297676
WO 02/30595A1 specification
Te Kaiping 11-333549 communique
The spy opens the 2000-79451 communique
But under the situation of spray to cast method, by the little nozzle ejection alloy liquation of internal diameter, so liquation is subjected to the strong resistance of nozzle.Therefore, need continuously apply big pressure to the alloy liquation with certain level.Applying of this pressure carried out in common deadweight (back pressure as required) by the adjusting liquation, and therefore above nozzle, quite the liquation of weight is retained and stores extremely roughly certain height horizontal state.
And then by the little nozzle ejection liquation of internal diameter, if therefore in the part generation liquation obstruction of nozzle, the resistance that liquation is subjected to from nozzle just becomes big, also has the danger of the emitted dose change of liquation.
Consider from such reason, under the situation of using present spray to cast method, make the liquation quantity delivered, for example increase to more than about 1.5kg/min, if want to improve the productivity ratio of quick cooling alloy, control the liquation quantity delivered equably and just become difficult, as a result of, the uneven homogenize of chilling speed meeting of quick cooling alloy, magnetic just should change.
And then, the spray to cast method, by with higher speed (for example more than the peripheral speed 20m/s) a spot of liquation being ejected on the chill roll of rotation, making comprises amorphous quick cooling alloy more.Therefore, the thickness of the quick cooling alloy of the thin ribbon shaped of made typically becomes below the 40 μ m.Bao thin ribbon shaped alloy like this, because bulk density uprises, it is difficult that efficient reclaims well.In addition, the powder particle that the following quick cooling alloy of pulverizing thickness 40 μ m obtains demonstrates flat pattern, therefore flowability, the filling deterioration of powder, and the magnetic packing density during molding procedure is low, therefore also exists the magnetic pack completeness in the bonded permanent magnet also to reduce such problem.
On the other hand, as the method for making quick cooling alloy, as mentioned above, also known the thin strip casting method.The thin strip casting method supplies to the alloy liquation and to rush down on the slot device (tundish) from calciner, make quick cooling alloy by the alloy liquation that rushes down on the groove is contacted with chill roll.
Below, the thin strip casting apparatus and method of putting down in writing in patent documentation 9 and 10 are described with reference to Fig. 2.
Thin strip casting device shown in Figure 2 possesses the fusion crucible 11 of can the melt raw material alloy and storing, the alloy liquation 12 that acceptance is injected from fusion crucible 11 also rushes down groove (guiding mechanism) 14 with what liquation 12 was directed to assigned position, and makes the alloy liquation 12 that injects from the front end that rushes down groove 14 carry out the chill roll 13 of chilling.
Rush down groove 14 and have relative horizontal direction, when the flow velocity of the liquation on the spigot surface is flow through in control, should flow rectification, realize that thus liquation is to chill roll 13 supply continuously stably with the liquation spigot surface that angle beta tilts.
The liquation of the outer surface of contact chill roll 13, chill roll 13 towings that are rotated are moved along the roller side face, are cooled in this operation, and become quick cooling alloy strip 15.The thin strip casting method, vertical line on from the position (the formation position in the liquid hole of liquation) of liquation 12 contact chill rolls 13 to the rotating shaft that drops on chill roll and the angle [alpha] between the vertical direction have great importance.When the positive direction of the opposition side predetermined angular α of the direction of rotation of chill roll 13, big if angle [alpha] becomes, liquation 12 is just elongated with the contact length of chill roll 13.Under the situation of utilizing the spray to cast method, relative fast of the rotation round speed of chill roll 13, if therefore this angle [alpha] is not set for roughly 0 °, liquation 12 becomes by the chill roll 13 that is rotated and is flown by bullet easily.Therefore, in the spray to cast method, angle [alpha] is near 0 °, easily the weak point relative with the contact length of chill roll.In contrast, under the situation of utilizing the thin strip casting method, can make angle [alpha] bigger, therefore the contact length of liquation on the roller circumferencial direction and roller outer peripheral face can be longer, and the cooling of liquation is roughly finished on roller.
As mentioned above, present thin strip casting method is not used the injection nozzle as the spray to cast method, carries out supplying with continuously alloy liquation 12 by rushing down groove 14 on chill roll 13, therefore is suitable for a large amount of productions, can realize that manufacturing cost reduces.
But, according to such thin strip casting method, maintenance is little from the amount of exercise of the alloy liquation of guiding mechanism supply chill roll, if therefore make the chill roll fast rotational, the surface of chill roll and the stickiness between the liquation are with regard to step-down, can not stably on the surface of chill roll, form the liquid hole of liquation, also exist and to make the such problem of quick cooling alloy strip with uniform thickness.Therefore, use present thin strip casting device, even want to make quenched alloy for nano-composite magnet with micro organization's structure, but because the thickness of quick cooling alloy strip becomes inhomogeneous, also can only obtain inhomogeneous quick cooling alloy tissue, the quick cooling alloy of stably making anti-practicality is difficult.
In addition, if use the thin strip casting device that possesses the tundish of record in the picture patent documentation 11 and 12, the flow velocity that flows through the liquation on the tundish is low, and chilling speed is also slack-off easily, therefore for making the quick cooling alloy that Nanocomposite magnet is used, think to be not suitable for.When chilling speed is slow, the alloy of the crystalline structure that the particle diameter that easy making contains volume is bigger.If chilling speed is slack-off, thickization just takes place in the crystal grain of soft magnetisms such as α-Fe easily, so deterioration takes place magnetic easily.
Therefore, as the device of record in patent documentation 11 and 12, be often used for making the metal casting sheet of complete crystallization.The quick cooling alloy that obtains like this, conduct is with R usually
2Fe
14The raw alloy utilization that B uses as the sintered magnet of principal phase, the hard magnetic fine for picture mixes the manufacturing that the Nanocomposite magnet that exists is used raw alloy equably with soft magnetism mutually in metal structure, be not suitable for.
Summary of the invention
The present invention finishes in view of the above fact, and its main purpose is, with the volume production level, stably the quick cooling alloy that provides Nanocomposite magnet with good magnetic to use.
Other purposes of the present invention are, make the apparatus and method of using, also show the quick cooling alloy of good characteristic as the magnet beyond the Nanocomposite magnet even provide.
Quenched alloy for nano-composite magnet manufacture method of the present invention comprises:
Preparation is with composition formula (Fe
1-mT
m)
100-x-y-zQ
xR
yM
z(T is one or more the element that is selected among Co and the Ni, Q be selected among B and the C, contain one or more the element of B at least, R is more than one rare earth element, and M is at least a metallic element that is selected among Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and the Pb) expression, composition ratio x, y, z and m satisfy respectively
10≤x≤35 atom %,
2≤y≤10 atom %,
0≤z≤10 atom % and
The operation of the alloy liquation of 0≤m≤0.5; And
Make above-mentioned liquation be contacted with the surface of the chill roll of rotation, make the refrigerating work procedure of quick cooling alloy thus;
Above-mentioned refrigerating work procedure comprises: supply with above-mentioned liquation on the guiding mechanism that the relative horizontal direction of spigot surface tilts, will flow through the operation that liquation on the above-mentioned spigot surface is supplied to the contact area that contacts with above-mentioned chill roll by [.
In preferred embodiment, the relative horizontal direction of above-mentioned spigot surface forms the angle below 70 ° more than 5 °.
In preferred embodiment, to link the angle [alpha] of position and the relative vertical direction formation of straight line of the rotating shaft of above-mentioned chill roll that above-mentioned liquation begins to contact the surface of above-mentioned chill roll, be set at the direction opposite and become more than 0 ° below 80 ° with the direction of rotation of above-mentioned chill roll.
In preferred embodiment, by a plurality of [es above-mentioned liquation is separated into many liquid stream after, be contacted with above-mentioned chill roll.
In preferred embodiment, the aperture area of each [is 0.02cm
2Above 0.5cm
2Below.
In preferred embodiment, the length of above-mentioned [is below the above 50mm of 0.5mm.
In preferred embodiment, the front end of above-mentioned [and above-mentioned chill roll surface be below the above 70mm of 0.3mm at interval.
In preferred embodiment, the flow direction of the just liquation when above-mentioned [comes out is stipulated with respect to central authorities to the formed angle of vertical line of the rotating shaft of above-mentioned chill roll from the peristome of the porch of above-mentioned [, the flow direction of the above-mentioned liquation above-mentioned angle towards with the direction of rotation opposition side of above-mentioned chill roll the time just is being made as, above-mentioned angle with the flow direction of above-mentioned liquation during towards the direction of rotation side of above-mentioned chill roll is made as under the negative situation, above-mentioned angle initialization is in the scope below 40 ° more than-20 °.
In preferred embodiment, above-mentioned guiding mechanism has the structure that support removably is provided with the parts of above-mentioned [.
In preferred embodiment, the top of liquation that flows through on the above-mentioned spigot surface opens wide, above-mentioned liquation is set in more than the 1.5kg/min the delivery rate of above-mentioned spigot surface, makes average thickness thus and surpasses that 50 μ m, 150 μ m are following, the standard deviation of thickness is the following quick cooling alloys of 10 μ m.
In preferred embodiment, the decompression mist that is produced on of above-mentioned quick cooling alloy encloses in the gas and carries out.
In preferred embodiment, the pressure that above-mentioned mist encloses gas is adjusted in below the above 100kPa of 0.13kPa.
Nanocomposite magnet manufacturing method of power of the present invention comprises: prepare the operation of the quenched alloy for nano-composite magnet made by above-mentioned any manufacture method and the Nanocomposite magnet manufacturing method of power of operation that above-mentioned quenched alloy for nano-composite magnet is pulverized.
In preferred embodiment, before or after above-mentioned pulverizing process, carry out crystallization heat treatment.
The manufacture method of Nanocomposite magnet of the present invention comprises: prepare the operation of the Nanocomposite magnet powder made by above-mentioned Nanocomposite magnet manufacturing method of power and above-mentioned Nanocomposite magnet powder pressing forming is made magnet formed body operation.
The slot device that rushes down of the present invention is the slot device that rushes down that is used to receive the alloy liquation and supplies with above-mentioned alloy liquation to the chill roll of quenching apparatus, by the material with fusing point higher than the temperature of alloy liquation form and relatively the spigot surface that tilts of horizontal direction and having make the alloy liquation that flows through above-mentioned spigot surface below the cast part of at least one [of passing through, above-mentioned cast part can dismounting.
Cast part of the present invention is to be fixed on above-mentioned cast part of rushing down on the slot device removably, has at least one and makes the alloy liquation that flows through the liquation spigot surface [by the below.
Quick cooling alloy manufacturing installation of the present invention is to possess chill roll and be used to receive the alloy liquation and supply with the slot device that rushes down of above-mentioned alloy liquation to above-mentioned chill roll, above-mentioned rush down slot device possess form by material with fusing point higher than alloy melt temperature and the relative spigot surface that tilts of horizontal direction and have at least one and make the alloy liquation that flows through the liquation spigot surface cast part by the [of below, the distance from the front end of above-mentioned [to above-mentioned chill roll surface is set in the scope below the above 50mm of 1mm.
In preferred embodiment, the above-mentioned relatively slot device that rushes down of above-mentioned cast part can dismounting.
The permanent magnet of the present invention manufacture method of quick cooling alloy, be to comprise the operation of preparing the alloy liquation, and make above-mentioned liquation be contacted with the surface of the chill roll of rotation, the permanent magnet manufacture method of quick cooling alloy of making the chilling operation of quick cooling alloy thus, above-mentioned refrigerating work procedure comprises on the guiding mechanism that the relative horizontal direction of spigot surface tilts supplies with above-mentioned liquation, and the liquation that will flow through on the above-mentioned spigot surface is supplied to the operation of the contact area that contacts with above-mentioned chill roll by [, and the distance from the front end of above-mentioned [to above-mentioned chill roll surface is set in below the above 50mm of 1mm.
In preferred embodiment, the relative horizontal direction of above-mentioned spigot surface forms the angle below 70 ° more than 5 °.
In preferred embodiment, to link the formed angle [alpha] of the relative vertical direction of straight line that above-mentioned liquation begins to contact the rotating shaft of the position on surface of above-mentioned chill roll and above-mentioned chill roll, be set at the direction opposite and become more than 5 ° below 80 ° with the direction of rotation of above-mentioned chill roll.
In preferred embodiment, after above-mentioned liquation being separated into many liquid streams by a plurality of [es, be contacted with above-mentioned chill roll.
In preferred embodiment, the aperture area of each [is 0.03cm
2Above 0.6cm
2Below.
In preferred embodiment, the length of above-mentioned [is below the above 50mm of 5mm.
In preferred embodiment, the surface cool by making the above-mentioned alloy liquation that goes out from above-mentioned tubulose orifice flow, solidify, form tubular part by above-mentioned alloy, the length of the actual effect of above-mentioned [is become more than the 10mm.
In preferred embodiment, the top of liquation that flows through on the above-mentioned spigot surface opens wide, and the mode that is full of the inside of above-mentioned [with above-mentioned liquation is supplied with above-mentioned liquation to above-mentioned spigot surface.
In preferred embodiment, the delivery rate of above-mentioned liquation to above-mentioned spigot surface is set in more than the 1.5kg/min, make average thickness thus and surpass that 50 μ m, 150 μ m are following, the standard deviation of thickness is the following quick cooling alloys of 10 μ m.
In preferred embodiment, the decompression mist that is produced on of above-mentioned quick cooling alloy encloses in the gas and carries out, and the mist that flows through the above-mentioned molten surface on the above-mentioned spigot surface encloses the pressure of gas and the above-mentioned molten surface that comes out from above-mentioned [on mist enclose gas pressure and be set at about equally.
The manufacture method of magnet powder of the present invention comprises the operation of the quick cooling alloy for magnet that preparation is made by above-mentioned any manufacture method and pulverizes the operation of above-mentioned quick cooling alloy for magnet.
In preferred embodiment, before or after above-mentioned pulverizing process, carry out crystallization heat treatment.
The manufacture method of magnet of the present invention comprises magnet powder that preparation is made by the manufacture method of above-mentioned magnet powder and the bonded permanent magnet operation of (comprising rubber magnet) is made in above-mentioned magnet powder compression moulding.
Other magnet manufacture method of the present invention comprises the operation of the magnet powder that preparation is made by the manufacture method of above-mentioned magnet powder and the operation that the above-mentioned magnet powder of sintering is made sintered magnet.
Description of drawings
Fig. 1 is the structure chart of the present spray to cast device of expression.
Fig. 2 is the structure chart of the present thin strip casting device of expression.
Fig. 3 is a structure chart of representing the quenching apparatus that uses in embodiments of the present invention.
Fig. 4 (a) is the stereogram that rushes down the groove structure that expression is fit to the device use of Fig. 3, and Fig. 4 (b) is its cutaway view, and Fig. 4 (c) is the cutaway view that rushes down the groove structure of representing other.
Fig. 5 is the detailed figure that rushes down the [on the groove that expression is arranged on Fig. 3.
Fig. 6 is the curve map of expression about the thickness distribution of the quick cooling alloy strip of embodiments of the invention and comparative example.
Symbol description: 11,21 fusion crucibles, 12,22 alloy liquations, 13,23 chill rolls, 14,24 rush down groove (chute), 24a [, 24b guide plate, 15,25 quick cooling alloy strips, 240 cast part.
The specific embodiment
The manufacturing of quenched alloy for nano-composite magnet at first, is described.
By the quenched alloy for nano-composite magnet that manufacture method of the present invention is made, composition formula is with (Fe
1-mT
m)
100-x-y-zQ
xR
yM
zExpression.At this, T is one or more the element that is selected among Co and the Ni, Q be selected among B and the C, contain one or more the element of B at least, R is more than one rare earth element, and M is at least a metallic element that is selected among Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ag, Hf, Ta, W, Pt, Au and the Pb.Composition ratio x, y, z and m satisfy 10≤x≤35 atom %, 2≤y≤10 atom %, 0≤z≤10 atom % and 0≤m≤0.5 respectively.
In the present invention, make the surface of the chill roll that the alloy liquation contact of above-mentioned composition is rotated, make alloy liquation chilling thus.In this chilling operation, the guiding mechanism that uses the relative horizontal direction of spigot surface to tilt supplies to liquation on this guiding mechanism.Then, the liquation that will flow through on the spigot surface by one or more [is supplied to chill roll.
According to the present invention, liquation carries out suitable rectification after supplying on the spigot surface of inclination of guiding mechanism during flowing through on this spigot surface.Liquation after the rectificationization, during by [, utilization is dwindled effect and is improved flow velocity, is therefore further arrived the surface of chill roll by [the time after the rectificationization.The liquation that comes out from [bumps against on the chill roll with big amount of exercise when flowing through on the spigot surface.Therefore, can improve the stickiness between liquation and the roll surface, and realize cooling uniformly.
Like this, in the present invention, by bumping against on the chill roll with speed near the liquation spouting velocity in the present spray to cast device, even in the peripheral speed of chill roll faster under the situation, also can on chill roll, stably form big liquation liquid hole, its result, the quick cooling alloy strip of producing thickness and cooling velocity homogenising in a large number becomes possibility.
Characteristic by the Nanocomposite magnet that obtains of heating quick cooling alloy, institutional framework to the quick cooling alloy before heating is extremely responsive, if therefore the chilling condition changes, the uneven homogenize of tissue meeting of quick cooling alloy, as its result, exist final magnet characteristic that the such problem of deterioration takes place easily.More particularly, even the rotary speed of chill roll or liquation quantity delivered are kept necessarily, if became slow in the part cooling velocity of quick cooling alloy, just separate out thick α-Fe in this part, deterioration often takes place in the magnet characteristic.
In addition, the average thickness of quick cooling alloy strip influences the shape of the powder particle pulverizing the quick cooling alloy strip and obtain.That is, quick cooling alloy is thin more, and powder particle is got over flattening, and in the flowability or filling that reduce powder, final compact density is step-down also.In contrast, if be made into thick quick cooling alloy, the shape of powder particle such as just becomes at the shape of axle, therefore flowability or the filling that improves powder, and easy moulding becomes.But according to the inventor's experiment, if former state ground uses present spray to cast method or thin strip casting method to form thick quick cooling alloy, it is big that the deviation of the thickness of quick cooling alloy can become.Therefore, make the occasion that thickness surpasses the quick cooling alloy strip of 50 μ m as wanting to improve powder flowbility, in the quick cooling alloy strip, forming the crystal grain of thickization of part, mutual in conjunction with weakening, therefore can not get desirable magnetic.
For Nanocomposite magnet, has R with such character
2Fe
14The occasion of the chilling magnet of the homogeneous structure structure of B system, the thickness deviation of quick cooling alloy does not give big influence to the magnet characteristic.Special in the cooling velocity that improves the alloy liquation, when making the quick cooling alloy (below the thickness 50 μ m) that approaches of whole intimate amorphous material, even the thickness generation deviation of quick cooling alloy also causes the fluctuation of final magnet characteristic hardly.
Experiment according to the inventor is known, using at present used spray to cast device to spray alloy liquation, carry out under the situation of chilling as the composition of object of the present invention, the liquation quantity delivered of time per unit (liquation delivery rate) becomes instability, observe uneven phenomenon significantly because the position different cooling of quick cooling alloy strip becomes, as the result of this phenomenon, the also uneven homogenize of the institutional framework in the quick cooling alloy.Like this, take place at the quick cooling alloy tissue under the situation of uneven homogenize, by pulverizing in the magnet powder of making, the magnet characteristics fluctuation is sneaked into the result of the powder particle of magnetic deterioration, and final magnet characteristic averages out, and equals to have taken place deterioration.
As mentioned above, in manufacturing, use under the situation of present spray to cast device, need apply strong pressure with certain level liquation by very thin nozzle orifice with quick cooling alloy that the present invention forms.In the case, being difficult to control should applied pressure, and liquation bears the strong resistance from internal face in the narrow path of nozzle orifice, so the jet velocity of liquation or spray volume change.
In the present invention, on the liquation spigot surface that tilts with the liquation rectification, [by the open area ratio broad on the leading section, can carry out the supply of liquation, although be the state (power that causes the motion of liquation only is the state of gravity) that liquation is not applied back-pressure (back pressure) therefore, but compare with the thin strip casting method, can supply with liquation to the roller surface with big amount of exercise.Its result improves the stickiness between roller surface and the liquation, and therefore minimizing can cool off more equably being involved in of the gas between roller surface and liquation.In addition, because the amount of exercise of liquation is difficult for change, so the thickness homogenising of quick cooling alloy strip obtains the quick cooling alloy tissue of homogeneous.Therefore, also improve the characteristic of the magnet that finally obtains.
Below, preferred embodiment of the present invention with reference to description of drawings.
In the present embodiment, use liquation quenching apparatus shown in Figure 3.Illustrated quenching apparatus is preferably in the space (for example container) with the decompression state of its internal configurations under can being in vacuum state or inert gas atmosphere.
As shown in Figure 3, this quenching apparatus possesses the fusion crucible 21 that is used to fuse alloy raw material, is used to make the chill roll 23 of alloy liquation 22 quench solidifications of supplying with from fusion crucible 21 and as the liquation guiding mechanism of liquation from the fusion crucible 21 guiding chill rolls 23 rushed down groove (tundish) 24.At the leading section that rushes down groove 24 (end) [24a is set.
The fusion crucible can 21 be supplied with the liquation 22 that the alloy raw material fusing is made with roughly certain speed to rushing down groove 24.This delivery rate makes the tilting action of fusion crucible 21 etc. by control, can at random regulate.
Chill roll 23, its outer peripheral face is formed by the good material of heat conductivities such as copper, for example, has the size of external diameter 20cm～100cm, wide 15cm～100cm.Chill roll 23 can be with the rotating speed rotation of regulation by not shown drive unit.Can at random regulate the peripheral speed of chill roll 23 by controlling this rotating speed.In preferred embodiment, chill roll 23 carries out water-cooled internally.The cooling velocity of quenching apparatus, the rotary speed by selecting chill roll 23 etc. are to be controlled at about 10
2℃/s～about 8 * 10
4℃/scope of s.
Rush down groove 24, with formations such as potteries, the liquation of supplying with continuously from fusion crucible 21 with the flow of regulation 22 temporarily carries out the liquation storage, and delays flow velocity, the liquid stream of liquation 22 can be carried out rectification.Rush down the angle (inclination angle beta) of the relative horizontal direction formation of liquation spigot surface of groove 24, preferably set in 5～70 ° scope.If inclination angle beta is lower than 5 °, liquation 22 just is not easy to swim across on spigot surface, the amount of exercise instability of the liquation 22 that comes out from [24a, therefore can not get the quick cooling alloy tissue of homogeneous, in addition, if inclination angle beta is lower than 70 °, turbulent flowization just takes place in the liquation 22 that flows through spigot surface, therefore on chill roll 23, do not form stable liquid hole, and splash.The preferred scope of inclination angle beta is more than 10 ° below 60 °, and preferred scope is more than 15 ° below 50 °.
In this manual, begin to contact the angle of the relative vertical direction formation of straight line of rotating shaft of the position (contact starting position) on surface of chill roll 23 and chill roll 23 as α with connecting liquation 22.When ° (degree), the contact starting position is in the topmost on roller surface in α=0.At this, so-called α is being for just, is the contact starting position when the topmost on roller surface is in the opposition side (upstream side) of roller direction of rotation, and so-called α is for negative, is the contact starting position when the topmost on roller surface is in roller direction of rotation side (downstream).In the contact starting position is under the situation about bearing, and does not form liquid hole (pouring basin) on chill roll 23, and splashes, and therefore can not suitably make the liquation cooling.On the contrary, under α was situation more than 80 °, liquation can not be positioned on the chill roll 23, fell from chill roll 23, therefore can not make liquation carry out suitably chilling.From above consideration, preferred α is more than 0 ° below 80 °.The more preferably scope of α is more than 2 ° below 60 °, and most preferred range is more than 2 ° below 45 °.By angle [alpha] being set in such scope, the length (contact length) that just liquation is contacted chill roll is set in more than the 10mm.
Fig. 4 (a) represents the structure of rushing down groove 24 of use in the present embodiment in more detail.This rushes down groove 24, on the fore-end (rushing down the end of groove) that the outer peripheral face with chill roll 23 relatively disposes, have can dismounting cast part 240.On cast part 240,3 [24a that the interval W only leave regulation ([in the heart distance) is provided with are set.The interval W of [24a, the suitable 10mm～50mm that sets for more suitably sets 15mm～40mm for.In the present embodiment, W sets 30mm at interval.
Fig. 4 (b) is the cutaway view that rushes down groove 24 of Fig. 4 (a).Rush down in the groove 24 at this, cast part 240 is being rushed down dismounting on the groove 24 from the spigot surface side.In this embodiment, [24a be arranged on can the cast part 240 of dismounting on, even therefore in [24a, take place under the situation that liquation stops up, there is no need also to change that to rush down groove 24 all, as long as it is just passable only to change cast part.
The invention is not restricted to such groove structure of rushing down, for example shown in Fig. 4 (c), the guide part 24b that cast part 240 is slided also can be set rushing down on the groove 24.According to Fig. 4 (c) rush down groove 24, can slightly extract and insert cast part 240 perpendicular to the direction (direction that is parallel to the rotating shaft of chill roll) of liquation stream.
It is straight tube that [24a there is no need, and also can be crooked.In addition, it is the same that the internal diameter of [24a there is no need along the liquation flow path direction, and internal diameter also can be little by little to reduce along the liquation flow path direction.But, need to adopt the shape that is difficult for producing turbulent flow.
The aperture area of [24a (aperture area on the leading section of [24a) need be set suitable size for.When making the quenched alloy for nano-composite magnet of above-mentioned composition, if the aperture area of [24a surpasses 0.5cm
2, it is excessive that the spray volume of liquation 22 can become, thereby be difficult for forming liquid hole (pouring basin) on roller 23, and splash, and exists to make the suitably possibility of chilling of liquation.On the contrary, if the aperture area of [24a is lower than 0.02cm
2, the liquation treating capacity of time per unit just drops to below the 1.5kg/min, thereby not only productivity ratio reduces, and the volume ratio of the amorphous state phase in the quick cooling alloy tissue becomes more than 50%.If the volume ratio of the amorphous state phase in the quick cooling alloy tissue becomes more than 50%, some deteriorations can take place in final permanent magnet characteristic.From above consideration, the aperture area of [(going out the liquation mouth) 24a is 0.02cm preferably
2Above 0.5cm
2Below.The lower limit of preferred aperture area is 0.03cm
2, most preferred lower limit is 0.05cm
2On the other hand, the lower limit of aperture area can be 0.2cm
2, also can be 0.15cm
2
In order more to increase the liquation treating capacity of time per unit, the [24a more than 4 can be set also.In the occasion that a plurality of [24a are set,, also can keep as all disposal abilities than the highland even the aperture area of each [is set lessly.On the contrary, be 1 or 2 s' occasion at [, preferably set the aperture area of each [greatly (0.07cm for example
2More than).
In the present embodiment, supply to the liquation 22 that rushes down on the groove 24, contact with chill roll 23, therefore contact 3 liquations 22 of chill roll 23, follow the rotation of chill roll 23, moved the roller periphery, in this mobile process, be cooled by 3 [24a.
Become not turbulentization in order to make by the liquation of rectification by on the spigot surface that rushes down groove 24, flowing, preferably with the length setting of [24a more than 0.5mm.But, if [24a is long, solidify with regard to being cooled in the part of [24a inner melt 22, therefore have the danger that liquation stops up takes place.Therefore, the length of [24a preferably sets below 50mm.
In addition, the interval on the surface of the front end of [24a and chill roll 23 is preferably below the above 50mm of 1mm.But, arriving the path of chill rolls 23 at the liquation that comes out from [24a 22, cooling atmosphere is seized the heat of molten surface, thereby the situation that exists the part of molten surface to solidify.In the case, the alloy molten surface part of having solidified, tubular and unfertile land cover and flow through its inner liquation, equal as having a kind of parts (tubular part) performance function of [.If form such simulation tubular part, just obtain the identical effect of effect that prolongs in fact with the length that is arranged on the [24a that rushes down on the groove 24.Therefore, the interval on the surface of the front end of [24a and chill roll 23 is set in more than the 3mm, and preferably the physical length with [is set in suitable scope (the above 30mm of 0.5mm is following).
Tubular part with [of this simulation, gas cooled is enclosed by mist in the surface of the alloy liquation that flows out from the [that rushes down groove 24, solidifies.The simulation tubular part of Xing Chenging like this contact with liquation stream and becomes high temperature, so is not limited to all be in complete solidified state, and at least a portion has the possibility of fusion.Therefore, " solidifying " state of the tubular part of so-called expression simulation, the meaning of broad sense is the state that has sufficient rigidity on liquation stream on the chill roll is supplied with in control, tubular part all do not need complete solidification.
Replace using the parts that liquation is solidified naturally, making is from the cast part of the [that has sufficient length (for example more than the 20mm) at first, under the situation of using this cast part,, the liquation of generation possibility of jamming is just arranged in longer pipe shape hole if [is thin.On the other hand, shorten the front end of [and the interval on chill roll surface, liquation solidifies, if carry out refrigerating work procedure naturally with the state that the length of the tubular part finished is extended deficiently, the actual effect length of [that comprises the tubular part length of simulation does not just reach length fully, or liquation stream gets muddled, or the possibility that is difficult to form stable liquid hole on chill roll is arranged.Therefore, the size of 5mm above (preferably more than the 10mm) is set at the interval on the front end of original [and chill roll surface for, behind the refrigerating work procedure of beginning liquation, the simulation tubular part shown in making is grown up, and preferably the actual effect length of [is in the scope of 7mm～50mm.
As present embodiment, by a plurality of [24a are set, if the liquation contact site on the outer peripheral face of chill roll 23 (liquation cooling end) is separated into the number place, the liquation quantitative change that time per unit is supplied with on the chill roll 23 is big, but becomes possibility with much the same condition cooling on each liquation stream.Comparing with the situation of supplying with a large amount of liquations at a place, can suppress the intensification of chill roll 23, is to keep high cooling capacity.As its result,, also lower thickness deviation even make the quick cooling alloy that surpasses 50 μ m thickness.In addition, a chill roll is disposed the groove that rushes down that ordered series of numbers has at least one [, the liquation contact site on the chill roll can be separated into the number place.
Rush down groove 24 and also can have the function of the temperature of adjusting the liquation 22 be about to arrive chill roll 23.In the temperature of rushing down the liquation 22 on the groove 24, hope is than the high temperature more than 100 ℃ of liquidus temperature.If the temperature of liquation 22 is low excessively, can give birth to nuclear to the alloy characteristic behind the chilling in the part with the primary crystallization of baneful influence, this is because often left behind after solidifying.Inject the melt temperature when rushing down groove or rush down the thermal capacity etc. of groove 24 self by regulating, can be controlled at the liquation retention temperature of rushing down on the groove 24, but as required, also can be provided with and rush down groove firing equipment (not shown) from the fusion crucible.In order to control the melt temperature that rushes down on the groove, preferably will set short scope in the zone length that the liquation that rushes down on the groove flows.In preferred embodiment, with the scope of such length setting below the above 20cm of 3cm.
The alloy liquation that solidifies on the outer peripheral face of chill roll 23 becomes banded solidified superalloy (quick cooling alloy strip 25), peels off from chill roll 23.
Then, with reference to Fig. 5.If the flow direction of the liquation 22 just when [24a comes out, to drop on the angle that the vertical line on the rotating shaft of chill roll 23 forms from the central authorities of the peristome of the porch of [24a relatively be γ.In addition, with the flow direction of liquation 22 and angle γ when the direction of rotation opposition side of chill roll 23 for just, with the flow direction of liquation 22 and angle γ when the direction of rotation side of chill roll 23 for bearing.In the present invention, preferably angle γ is set in the scope below 40 ° more than-20 °.If angle γ is lower than-20 °, just do not form the liquid hole, can splash, the worry that can not make the liquation chilling is arranged.On the other hand, if angle γ surpasses 40 °, mounting liquation not just on roller, and fall from roller, therefore the worry that can not make the liquation chilling is arranged.The preferable range of angle γ is more than-15 ° below 30 °, and preferred scope is more than-13 ° below 25 °.
The average thickness of the quick cooling alloy strip of making is preferably surpassing 50 μ m, scope below the 150 μ m.According to the present invention, the standard deviation of quick cooling alloy strip thickness can be controlled at below the 20 μ m, its result makes the even tissueization in the quick cooling alloy, can improve the magnet characteristic.If with the big liquation delivery rate more than the 1.5kg/min, make the average thickness of quick cooling alloy be brought down below 50 μ m, just need make the peripheral speed of chill roll quite fast, and form the quick cooling alloy of complete amorphous material.Being under the situation as the Nanocomposite magnet of object of the present invention,, can not stably form the such problem of nano combined tissue with good magnet characteristic with regard to existing if the quick cooling alloy of complete amorphous material is heat-treated.By the magnet characteristic after the evaluation heat treatment as can be known, the preferred lower limit of the average thickness of quick cooling alloy is 55 μ m, and most preferred lower limit is 60 μ m.
On the other hand, if the peripheral speed of control chill roll 23, make the average thickness of quick cooling alloy strip surpass 150 μ m, just finish the cooling of the alloy liquation that causes by chill roll 23 deficiently, the average grain diameter of the iron-based boride of separating out in resulting quick cooling alloy surpasses in the 50nm, above thick of tangible one-tenth particle diameter 100nm
α-FePossibility.When using such a crystalline state quick cooling alloy, the rectangularity generation deterioration of the demagnetization curve of the magnet that behind heat treatment step, obtains.From above consideration, the preferred average thickness of quick cooling alloy is below the 150 μ m.
Make the quick cooling alloy strip thick more, cooling velocity reduces more, and it is big that the size of the crystallization of separating out in quick cooling alloy just becomes more.Occasion at the alloy of the present embodiment that becomes Nanocomposite magnet is included in the quick cooling alloy
α-FeIf or the crystal grain diameter of soft magnetism phase such as iron-based boride surpasses 50nm, will produce neticdomain wall at the intragranular of hard magnetic phase, even thereby since with as hard magnetic Nd mutually
2Fe
14The mutual combination of Type B compound phase also causes reversal of magnetization in the demagnetizing field a little externally, and the possibility that can not get good Hard Magnetic characteristic is arranged.Therefore, the crystal grain diameter that is present in the soft magnetism phase in the quick cooling alloy preferably below the 50nm, is more preferably below the 30nm, most preferably is below the 20nm.
On the other hand, Nd
2Fe
14The crystal grain diameter of Type B compound phase is preferably below the 300nm as the single magnetic domain crystal grain diameter.Utilize interactive magnetic to improve Nd in order to reach
2Fe
14The crystal grain diameter of Type B compound phase is preferably below the 200nm.Nd
2Fe
14The preferred upper limit of the crystal grain diameter of Type B compound phase is 150nm, and the most preferred upper limit is below the 100nm.
Moreover in the present invention, importantly, peripheral speed of internal diameter by suitably selecting [24a and number, liquation delivery rate, chill roll 23 etc. is set in the thickness and the width of resulting quick cooling alloy strip in the suitable scope.In order to obtain uniform tissue, spreading all over width, to make the cooling velocity homogenising also be important.For this reason, preferably by regulating the aperture area of [24a, the width of thin ribbon shaped quick cooling alloy is set in the scope of 3mm～20mm.The width of thin ribbon shaped quick cooling alloy is wide more, easy more pulverizing, so the width of thin ribbon shaped quick cooling alloy preferably sets more than 5mm.
In addition, if the hypertonia of chilling atmosphere gas is given birth to being involved in of roller inert gas on every side all the more when chill roll 23 rotates at a high speed, do not reach the stable state of cooling.On the other hand, if the atmosphere gas pressure is low excessively, the quick cooling alloy strip that breaks away from from chill roll 23 is not cooled off rapidly by inert gas, therefore carries out crystallization, can not make and contain amorphous alloy in a large number.In the case, the magnetic of the alloy that obtains after crystallization heat treatment reduces.From these considerations, inert gas pressure preferably is adjusted to 0.13kPa～100kPa.The chilling mist is enclosed gas pressure be set in above-mentioned scope, also useful to the simulation tubular part that the surface that stably forms liquation stream can be solidified.
[composition of Nanocomposite magnet limits reason]
Q is a kind of or two kinds of elements of B (boron) or C (carbon).B is for the Fe as the soft magnetism phase of the principal phase of nanocomposite type permanent magnet material
3Iron-based borides such as B with as hard magnetic R mutually
2Fe
14The necessary element of B.If the ratio of components x of B beyond the scope of 10～30 atom %, just can not show the permanent magnet characteristic, about the ratio of components x of B, 10≤x≤30 atom % preferably.In this manual, " Fe
3B " also comprise and being not easy and Fe
3The Fe of B difference
3.5B.
And then, if the ratio of components x of B is lower than 10 atom %, the amorphous state of liquation generates and can just reduce, when adopting method of the present invention to make quick cooling alloy, the alloy liquation can not become the cooled liquid state in the chilling operation, just can not obtain the good alloy liquation strip of flatness.Even such quick cooling alloy strip is carried out crystallization heat treatment, also can not get uniform Nanocomposite magnet tissue, do not show good magnet characteristic.If the ratio of components x of B surpasses 30 atom %, just generate the hard magnetic phase deficiently.The preferable range of x is below the above 20 atom % of 10 atom %, and preferred scope is below the above 20 atom % of 10.5 atom %.Moreover, promptly use C to replace by atom ratio to 50% of B, to magnetic and not influence of metal structure, allow.
Rare earth element R is in order to show the R of permanent magnet characteristic as the hard magnetic phase of necessity
2Fe
14B is necessary element.R among the present invention preferably comprises a kind of of Pr and Nd, Dy, Tb or more than two kinds.But amorphous state generates energy or crystallized temperature is a purpose to adjust, and can replace a part with other rare earth elements beyond these.If the ratio of components y of R is lower than 2 atom %, do not have R with regard to not generating
2Fe
14The hard magnetic phase of Type B crystalline texture.On the other hand,, just do not generate iron or iron-based boride, can not make Nanocomposite magnet if the ratio of components y of R surpasses 10 atom %.Consider from these, about the ratio of components y of R, preferably 2≤y≤10.The preferable range of ratio of components y is below the above 9.5 atom % of 3 atom %, and preferred scope is below the above 9.2 atom % of 4 atom %.
Occupy all the other content of above-mentioned element with Fe, in addition, replace the part of Fe, improve the rectangularity of demagnetization curve, can improve maximum magnetic energy product (BH) with Co
Max
And then, can add at least a metallic element M that is selected among Al, Si, Ti, V, Cr, Mn, Cu, Zn, Ga, Zr, Nb, Mo, Ni, Hf, Ta, W, Pt, Pb, Au and the Ag.When these ratio of components z that add element M surpass 10 atom %, cause magnetization to reduce, so preferred range is 0≤z≤10 atom %.Preferred scope is 0.3≤z≤5 atom %.
Even in above-mentioned metallic element, Ti brings good especially effect.By adding Ti, in the chilling operation, has R
2Fe
14The compound of Type B crystalline texture (hard magnetic phase) is preferentially separated out and is grown up, because the generation of α-Fe is suppressed.And, obtain existing slightly the tissue of fine iron-based boride at the crystal boundary of hard magnetic phase.Such tissue can be brought into play excellent characteristic as Nanocomposite magnet usefulness.Therefore, preferably add Ti.The addition of Ti preferably below the above 7 atom % of 0.5 atom %, is more preferably below the above 6 atom % of 1 atom %.
[embodiment]
Present embodiment uses quenching apparatus shown in Figure 3 to carry out.Specifically, at first, use Nd, Fe, Co, B, C and the Ti material of purity more than 99.5%, the weighing total amount is 5kg, so that become Nd by the atomic ratio alloy composition
8.5Fe
75Co
2B
11C
1Ti
2.5, drop in the aluminum crucible.
Then, in the aluminum crucible, use the high-frequency melting method to make the raw material fusing, make the alloy liquation of above-mentioned composition.Melt temperature is set in 1350 ℃.After this, the aluminum crucible that verts, with the alloy liquation supply to Fig. 4 (a) and (b) shown in the spigot surface that rushes down slot device on.
The parts that 1～3 [is set can embed the lower end of spigot surface removably, and the liquation that flows through spigot surface dwindles in [, below [, supply with to the surface of chill roll.
The length of rushing down the [of groove is about 20mm.Set about 20mm for from front end to the distance on chill roll surface of [.The liquation that comes out from [contacts with chill roll remaining under the argon atmosphere gas condition of 11.3kPa, by chilling.The peripheral speed of chill roll is set in 15m/s.The number of [, aperture area, other chilling condition are shown in the following table 1.
Table 1
| Go out liquation mouth number | Go out liquation open area (cm 2) | α (degree) | β (degree) | γ (degree) | Could generate quick cooling alloy | Liquation treating capacity (kg/min) | ||
| Embodiment | 1 | 2 | 0.03 | 10 | 32 | 10 | ○ | 4.0 |
| 2 | 2 | 0.07 | 20 | 40 | 3 | ○ | 5.3 | |
| 3 | 3 | 0.07 | 30 | 35 | 5 | ○ | 7.0 | |
| 4 | 3 | 0.13 | 30 | 35 | 5 | ○ | 11.0 | |
| 5 | 1 | 0.18 | 10 | 25 | 0 | ○ | 7.3 | |
| 6 | 4 | 0.07 | 30 | 25 | 5 | ○ | 8.7 | |
| 7 | 3 | 0.07 | 10 | 35 | 10 | ○ | 7.0 | |
| 8 | 2 | 0.13 | 30 | 35 | -12 | ○ | 7.2 | |
| Comparative example | 9 | - | - | 30 | 25 | - | ○ | 6.0 |
| 10 | - | - | 10 | 25 | - | ○ | 6.0 | |
| 11 | - | - | 30 | 35 | - | × | - | |
As a comparative example, make the quick cooling alloy strip with the thin strip casting method of using the guiding mechanism that [is not set.Alloy composition is identical with embodiment.With the condition of sample No.9～10 shown in the table 1, the quick cooling alloy strip can be made, but the quick cooling alloy strip can not be made with the condition of sample No.11, in comparative example, the amount of exercise of the liquation of contact roll surface is little, and the stickiness between liquation and the roll surface is low.Therefore, the flatness of the roll surface side surface of quick cooling alloy strip is low, forms the many recesses of little quantity.This means the inadequate position of the cooling that has many parts, magnet characteristic generation deterioration.
Fig. 6 represents the thickness distribution of the quick cooling alloy strip (embodiment) made with the condition of the sample No.4 shown in the table 1 and the thickness distribution of the quick cooling alloy strip (comparative example) made with the condition of sample No.9.Determination of thickness is used the micrometering instrument of two spheres, and 100 parts to the quick cooling alloy strip carry out respectively.The size of each part is about long 20～50mm * wide 6mm.
As shown in Figure 6, the quick cooling alloy strip of embodiment is compared with comparative example, and thickness is uniform.Liquation quantity delivered among the No.4 is more than the liquation quantity delivered among the sample No.9, and the average thickness of resulting quick cooling alloy strip, No.4 are also thick than sample No.9.The reason of the thickness deviation of the quick cooling alloy strip of comparative example is thought because the stickiness between liquation and the roll surface reduces.
Moreover, compare with embodiment, the average thickness of the quick cooling alloy strip of comparative example is thin, and the thin strip casting device of use comparative example, want to obtain strip near the average thickness of the quick cooling alloy strip of sample No.4, even increase the liquation quantity delivered, can not form liquid hole stably, can not repeatability make the alloy thin band of institute's required thickness well.
By the above as can be known, according to embodiments of the invention, even the above quick cooling alloy strip of average thickness 80 μ m is made well while also can suppress average deviation (standard deviation) repeatability of thickness.
Then, after the working power pulverizer will be broken into size below the 850 μ m with the quick cooling alloy strip meal that above-mentioned each condition is made, use endless conveyor belt formula continuous heat treating furnace, in argon gas in 700 ℃ quick cooling alloy kept 10 minutes after, be cooled to the heat treatment of room temperature.By this heat treatment, crystallization takes place in amorphous state mutually that be present in the quick cooling alloy, obtains final Nanocomposite magnet tissue.About the Nanocomposite magnet powder that obtains like this, use the oscillating mode magnetometer to measure magnetic.Measurement result is shown in the following table 2.
Table 2
| B r (mT) | (BH) max (kJ/m 3) | H cJ (kA/m) | ||
| Embodiment | 1 | 900 | 120 | 666 |
| 2 | 863 | 116 | 672 | |
| 3 | 870 | 115 | 672 | |
| 4 | 862 | 112 | 661 | |
| 5 | 853 | 110 | 681 | |
| 6 | 866 | 115 | 675 | |
| 7 | 882 | 117 | 669 | |
| 8 | 873 | 115 | 683 | |
| Comparative example | 9 | 834 | 104 | 684 |
| 10 | 843 | 103 | 652 | |
| 11 | 827 | 98 | 671 | |
As known from the above, about Nanocomposite magnet, although understand embodiments of the present invention and embodiment, but research according to the inventor, the manufacture method of using device shown in Figure 3 to carry out, the quick cooling alloy used of Nanocomposite magnet not only, even and the bonded permanent magnet that is applied to other kinds also reach good effect with quick cooling alloy or sintered magnet with quick cooling alloy.That is, do not need the special alloy composition that limits fusing, should carry out quench solidification, in the manufacturing that quick cooling alloy manufacturing installation and the method for of the present invention can be widely used in quick cooling alloy for magnet.
Below, the embodiment when applying the present invention to sintered magnet with quick cooling alloy is described.
Even when making the quick cooling alloy that sintered magnet uses, use the device of Fig. 3, flow through the liquation on the spigot surface that rushes down groove of inclination, in passing through the process of [, dwindle in [, the sustaining layer stream mode sprays well in the same old way, therefore hits on the surface of chill roll with high amount of exercise.Therefore, the stickiness on alloy liquation and chill roll surface improves, even also stably form the liquid hole of liquation on the chill roll surface that is rotated.
Present thin strip casting device, the temporary transient tundish of storing liquation of process is supplied with liquation to chill roll, forms the liquation liquid hole with the size that liquation spues partly and stipulate at the interval on chill roll surface of tundish.Therefore, the liquation of tundish is not spued the interval setting on part and chill roll surface greater than more than the 0.5mm.In addition, the liquation spigot surface of tundish is tilted, quicken mobile such technological thought of liquation, thereby liquation is mobile on the chill roll surface with low speed from the liquation of the tundish part that spues.Therefore, in present thin strip casting device, the stickiness on liquation and chill roll surface is inadequate.
According to the present invention, if improve the stickiness on liquation and roller surface, just lower the gas that can between roller surface and liquation, be involved in, and the amount of exercise of liquation is stable, so the thickness of quick cooling alloy and cooling velocity homogenising.Its result compares the quick cooling alloy tissue that obtains having good uniformity with present thin strip casting method.At present, in the alloy that sintered magnet is used, do not require the quick cooling alloy tissue that has good uniformity than it, but in order to show better magnet characteristic (especially high coercivity), even known sintered magnet also is the alloy structure that has good uniformity preferably.
When the manufacturing sintered magnet is used quick cooling alloy, if the aperture area that goes out the liquation mouth of [surpasses 0.6cm
2And become excessive, and the spray volume of liquation just becomes too much, thereby does not form the liquid hole on chill roll, and splashes, and existence can not make the danger of the suitable chilling of liquation.On the contrary, if the aperture area that goes out the liquation mouth of [is reduced to 0.03cm
2Below, the liquation treating capacity of time per unit just is reduced to below the 1.5kg/min, and productivity ratio reduces, and is worthless therefore.
From above consideration, when the manufacturing sintered magnet was used quick cooling alloy, preferably the aperture area that goes out the liquation mouth with straight tube-like was set in 0.03cm
2Above 0.6cm
2In the following scope.The preferred lower limit of the aperture area that goes out the liquation mouth of straight tube-like is 0.07cm
2, preferred higher limit 0.4cm
2
Moreover, by near rushing down the front end of groove, a plurality of [es being set, can increase the liquation treating capacity of time per unit.
About the configuration of rushing down groove in the cooling device (number ranges of angle [alpha], β, γ etc.), can use about the illustrated condition of Nanocomposite magnet.
According to the apparatus and method of above explanation, the stickiness between alloy liquation and the chill roll surface improves, and reaches uniform cooling, can make the quick cooling alloy for magnet of the uniformity raising of alloy structure thus.Such a advantageous effects does not depend on employed alloy composition, and, be that bonded permanent magnet or sintered magnet are all relevant with the raising of magnet characteristic.
In addition,,, the liquid hole can be stably formed, therefore thicker quick cooling alloy can be stably formed though make the interval of rushing down between front of the slot portion and the chill roll surface bigger than present thin strip casting device according to apparatus and method of the present invention.
And then, owing to rush down the leading section of groove and the interval between the chill roll surface becomes big relatively, therefore rushing down near the liquation that solidifies the front of the slot, be difficult to be created in rush down between front of the slot portion and the chill roll surface and stop up, make the situation that suitable refrigerating work procedure can not be continuous.Especially, as shown in Figure 4, can dismounting owing to have the cast part of [, do not rush down all replacings of groove 24, only change cast part 240, just can make the device long-term operation.
In addition, according to the present invention, liquation flows through on the spigot surface that rushes down groove of inclination with fast speeds (for example more than the 0.2m/s), filling rush down on the groove liquation to arrive the chill roll surface during also Billy with the shortening of present thin strip casting method.Therefore, suppress to rush down the reduction of the melt temperature on the groove, melt temperature is being set under the situation of hanging down some, also can supply with liquation to chill roll with desired temperature.In addition, liquation flows fast rushing down on the groove liquation, therefore in the oxidation that suppresses liquation, has to have oxide skin etc. and be difficult for accumulating in and rush down such benefit in the groove.The oxidation of liquation causes liquation viscosity to rise, and can become the reason of stopping up [, but according to the present invention, because liquation flows through the spigot surface of inclination fast, rises so suppressed to result from the viscosity of the oxidation of liquation, also suppresses the obstruction of [.
Below, the embodiment of sintered magnet manufacture method is described.
[embodiment]
In the present embodiment, also use quenching apparatus shown in Figure 3 to carry out.Specifically, at first, use the material of Nd, Dy, B, C and the Fe of purity more than 99.5%, the weighing total amount is 4kg, and ratio is counted by weight, and alloy composition is 31.1Nd-1.0Dy-1.1B-3.0C-63.9Fe, put in the aluminum crucible,
Then, in the aluminum crucible, utilize the high-frequency melting method that raw material is melted, make the alloy liquation of above-mentioned composition.Melt temperature is set in 1500 ℃.After this, the aluminum crucible is tilted, the alloy liquation is supplied on the spigot surface that rushes down slot device.
In the present embodiment, can embed removably in the lower end of spigot surface and 3 [es to be set (diameter: parts 4mm), the liquation that flows through spigot surface dwindles in [, supplies on the surface of the chill roll of rotation below the [
Rush down the length of the [of groove, the stage before the tubular part of simulation is grown up approximately is 10mm.Distance from the front end of [to the chill roll surface is set in about 10mm at first.The liquation that comes out from [contacts with chill roll remaining under the argon atmosphere gas of 50kPa, by chilling.The roller peripheral speed of chill roll is set 2m/s for.α sets 5 ° for, and β sets 20 ° for, and γ sets 2 ° for.When chilling operation stabilisation, the tubular part of simulation is grown into the length about 7mm, its result, and the actual effect length of [reaches about 17mm.At this moment, the front end of the tubular part of simulation and chill roll surface is about 1.5mm～3.0mm at interval.
In the present embodiment, the number of [is 3, therefore supplies with 3 alloy liquations on chill roll, forms 3 quick cooling alloys simultaneously.The quick cooling alloy that obtains like this (casting sheet) has the size of wide 6～10mm, long 10～300mm separately.
From the quick cooling alloy made like this, select 100 casting sheets arbitrarily, measure the thickness of respectively casting sheet.Its result, the average thickness of casting sheet is 230 μ m, the standard deviation of thickness is 20 μ m.Crystal grain diameter in the casting sheet, the size of short-axis direction is 0.5～7 μ m, and the size of long axis direction is 3～70 μ m, and the rich terres rares with thickness 0.5～7 μ m surrounds principal phase (R mutually
2Fe
14The B phase) alloy structure.Utilize electron beam microanalyser (Shimadzu Seisakusho Ltd.'s system: EPM-810) confirm evenly to exist dispersedly rich terres rares phase.
With known method with the coarse crushing of above-mentioned casting sheet after, it is broken to carry out fine powder again, makes the micro mist comminuted powder of particle mean size 3.0 μ m.This micro mist comminuted powder carries out sintering carry out moulding in the magnetic field of intensity 1.20MA/m after.Pressure during moulding is set in 100MPa, and sintering carried out 3 hours at 1060 ℃.Behind the sintering, 600 ℃ of Ageing Treatment of carrying out 1 hour.The magnet characteristic of the permanent magnet that obtains like this is shown in Table 3.
(comparative example)
Use device shown in Figure 2, make the quick cooling alloy of the alloy composition identical with roughly the same condition with embodiment.Dissimilarity is, by [, does not supply with liquation from rushing down groove to chill roll.Set 10mm for from front end to the distance on chill roll surface of rushing down groove.α sets 20 ° for, and β sets 10 ° for.
Like this, make the quick cooling alloy (casting sheet) of wide 20～30mm, long 10～300mm.Select resulting 100 casting sheet arbitrarily, measure the thickness of these casting sheets, its result, average thickness is 240 μ m, the standard deviation of thickness is 64 μ m.
The crystal grain diameter of above-mentioned casting sheet, the size of short-axis direction are 0.5～20 μ m, and the size of long axis direction is 10～300 μ m, have the following rich terres rares of thick 2.0 μ m and surround the alloy structure of principal phase (R2Fe14B phase) mutually.
With the condition identical with embodiment, pulverize above-mentioned casting sheet, obtain sintered magnet.The magnet characteristic of resulting permanent magnet is shown in Table 3.
Table 3
| B r(T) | (BH) max(kJ/m 3) | H cJ(MA/m) | |
| Embodiment | 1.28 | 353.2 | 1.61 |
| Comparative example | 1.27 | 335.4 | 1.24 |
As shown in Table 3, compare with comparative example, the maximum magnetic energy product of embodiment and coercivity improve.This is that the alloy liquation cools off uniformly, thereby obtains uniform magnet alloy tissue because the stickiness between alloy liquation and the chill roll improves.
The invention effect
According to the present invention, even on the fast chill roll of rotary speed, also can stably form liquation liquid hole, therefore can produce in a large number quenched alloy for nano-composite magnet or other quick cooling alloy for magnet.
Claims (18)
1. one kind rushes down slot device, is used to receive the alloy liquation and supplies with described alloy liquation to the chill roll of quenching apparatus, it is characterized in that:
Comprise: by the spigot surface that the material with fusing point higher than the temperature of alloy liquation forms and relative horizontal direction tilts; With
Have make the alloy liquation that flows through described spigot surface below the cast part of at least one [of passing through;
Described cast part can dismounting.
2. one kind is fixed on the described cast part of rushing down on the slot device of claim 1 removably, it is characterized in that: have at least one and make the alloy liquation that flows through the liquation spigot surface [by the below.
3. quick cooling alloy manufacturing installation possesses chill roll and is used to receive the alloy liquation and supplies with the slot device that rushes down of described alloy liquation to described chill roll, it is characterized in that:
The described slot device that rushes down possesses: the spigot surface that horizontal direction that formed by the material with fusing point higher than alloy melt temperature and relative tilts; And, have at least one and make the alloy liquation that flows through the liquation spigot surface pass through the cast part of the [of below;
Distance from the front end of described [to described chill roll surface is set in the scope below the above 50mm of 1mm.
4. quick cooling alloy manufacturing installation according to claim 3 is characterized in that: the described relatively slot device that rushes down of described cast part can dismounting.
5. the manufacture method of a permanent magnet usefulness quick cooling alloy comprises: the operation of preparing the alloy liquation; And make described liquation be contacted with the surface of the chill roll of rotation, make the refrigerating work procedure of quick cooling alloy thus, it is characterized in that:
Described refrigerating work procedure comprises: on the guiding mechanism that the relative horizontal direction of spigot surface tilts, supply with described liquation, and the liquation that will flow through on the described spigot surface be supplied to the operation of the contact area that contacts with described chill roll by [,
Distance from the front end of described [to described chill roll surface is set in below the above 50mm of 1mm.
6. manufacture method according to claim 5 is characterized in that: the relative horizontal direction of described spigot surface forms the angle below 70 ° more than 5 °.
7. according to claim 5 or 6 described manufacture methods, it is characterized in that: will link described liquation and begin to contact the position on described chill roll surface and the formed angle [alpha] of the relative vertical direction of straight line of the rotating shaft of described chill roll, and be set at the direction opposite and become more than 5 ° below 80 ° with the direction of rotation of described chill roll.
8. according to each described manufacture method in the claim 5～7, it is characterized in that: after described liquation being separated into many liquid streams by a plurality of [es, be contacted with described chill roll.
9. according to each described manufacture method in the claim 5～8, it is characterized in that the aperture area of each [is 0.03cm
2Above 0.6cm
2Below.
10. according to each described manufacture method in the claim 5～9, it is characterized in that: the length of described [is below the above 50mm of 5mm.
11. according to each described manufacture method in the claim 5～10, it is characterized in that: the surface cool by making the described alloy liquation that flows out from described [, solidify, form tubular part by described alloy, the length of the actual effect of described [is become more than the 10mm.
12. according to each described manufacture method in the claim 5～11, it is characterized in that: the top of liquation that flows through on the described spigot surface opens wide, and the mode that is full of the inside of described [with described liquation is supplied with described liquation to described spigot surface.
13. manufacture method according to claim 12, it is characterized in that: the delivery rate of described liquation to described spigot surface is set in more than the 1.5kg/min, makes average thickness thus and surpass that 50 μ m, 150 μ m are following, the standard deviation of thickness is the following quick cooling alloys of 10 μ m.
14. according to each described manufacture method in the claim 5～13, it is characterized in that: the decompression mist that is produced on of described quick cooling alloy encloses in the gas and carries out, and flow through that mist on the described molten surface on the described spigot surface encloses the pressure of gas and the described molten surface that comes out from described [on mist enclose gas pressure and be set at about equally.
15. the manufacture method of a magnet powder is characterized in that: comprising:
The operation of the quick cooling alloy for magnet that preparation is made by each described manufacture method in the claim 5～14;
Pulverize the operation of described quick cooling alloy for magnet.
16. the manufacture method of magnet powder according to claim 15 is characterized in that: before or after described pulverizing process, carry out crystallization heat treatment.
17. the manufacture method of a magnet is characterized in that: comprising:
The operation of the magnet powder that preparation is made by the manufacture method of claim 15 or 16 described magnet powders;
The operation that bonded permanent magnet is made in described magnet powder moulding.
18. the manufacture method of a magnet is characterized in that: comprising:
The operation of the magnet powder that preparation is made by the manufacture method of claim 15 or 16 described magnet powders;
The operation that described magnet powder sintering is made sintered magnet.
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| JP2002230802 | 2002-08-08 | ||
| JP2002230802 | 2002-08-08 | ||
| JP2003044511 | 2003-02-21 |
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| CNB031221882A Division CN1305080C (en) | 2002-08-08 | 2003-04-24 | Method for producing quick cooling alloy for magnet |
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| CN100371106C CN100371106C (en) | 2008-02-27 |
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| CNB2005101278937A Expired - Fee Related CN100371106C (en) | 2002-08-08 | 2003-04-24 | Method and producing device for making rapidly solidified alloy for magnet |
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| US20220319772A1 (en) * | 2021-04-01 | 2022-10-06 | Baotou Kerui Micro Magnet New Materials Co., Ltd. | Method for preparing a high-performance nd-fe-b isotropic magnetic powder |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109248994B (en) * | 2017-08-19 | 2021-05-25 | 福建省长汀金龙稀土有限公司 | Casting device and casting method for thin strip |
| JP6338004B1 (en) * | 2017-10-06 | 2018-06-06 | Tdk株式会社 | Soft magnetic alloys and magnetic parts |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| YU43229B (en) * | 1980-05-09 | 1989-06-30 | Battelle Development Corp | Device for continuous band casting |
| JPS6015049A (en) * | 1983-07-06 | 1985-01-25 | Hitachi Ltd | Continuous casting device |
| JPH02179803A (en) * | 1988-12-28 | 1990-07-12 | Nippon Steel Corp | Pouring vessel for manufacturing flake for nd series permanent magnet |
| JPH02247304A (en) * | 1989-03-17 | 1990-10-03 | Nippon Steel Corp | Nozzle for pouring molten nd alloy |
| JPH02247306A (en) * | 1989-03-17 | 1990-10-03 | Nippon Steel Corp | Device for removing metal for nozzle charging nd alloy |
| JPH02247307A (en) * | 1989-03-17 | 1990-10-03 | Nippon Steel Corp | Manufacture of nd alloy flake |
| JP3535253B2 (en) * | 1995-02-23 | 2004-06-07 | 住友特殊金属株式会社 | Method for producing cast slab for R-Fe-B permanent magnet |
| JP3987959B2 (en) * | 1998-05-22 | 2007-10-10 | 株式会社Ｉｈｉ | Molten metal supply control device |
| JP3901875B2 (en) * | 1998-06-24 | 2007-04-04 | 株式会社アルバック | Tundish, method for producing rare earth element-containing alloy using the tundish, and apparatus for producing rare earth element-containing alloy having the tundish |
| US6302972B1 (en) * | 1998-12-07 | 2001-10-16 | Sumitomo Special Metals Co., Ltd | Nanocomposite magnet material and method for producing nanocomposite magnet |
-
2003
- 2003-04-24 CN CN 200510127891 patent/CN1805071A/en not_active Withdrawn
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| US20220319772A1 (en) * | 2021-04-01 | 2022-10-06 | Baotou Kerui Micro Magnet New Materials Co., Ltd. | Method for preparing a high-performance nd-fe-b isotropic magnetic powder |
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| CN100371106C (en) | 2008-02-27 |
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