CN105463223B - A kind of preparation method of Al B RE intermediate alloys - Google Patents
A kind of preparation method of Al B RE intermediate alloys Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
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Abstract
The invention discloses a kind of preparation method of Al B RE intermediate alloys, specially：The alloying reaction of potassium fluoborate and aluminium liquid first in intermediate frequency furnace, then adds rare earth element, then remove the gred, degasification, finally casting obtains final product.The present invention uses relatively low KBF4With the alloying temperature (680 720 DEG C) of aluminium liquid, and charging rate is controlled, reduce KBF4Volatilization, and while charging while stir, KBF can be made4It is evenly distributed in reaction interface, it is to avoid because of KBF4Accumulation and cause the problems such as hot-spot, product segregation, KBF can be increased again4Chemical reaction velocity and degree, so as to improve B casting yields, reduce production cost.Meanwhile, the temperature of present invention control whole preparation process, and make KBF as transition zone in aluminium liquid upper berth elpasolite powder4Raw material uniformly reacts with aluminium liquid, it is to avoid the steep temperature rise phenomenon that Al liquid local location occurs acutely chemical reaction and brings, so as to effectively inhibit AlB2To AlB12The transformation behavior of phase.
Description
Technical field
The present invention relates to a kind of preparation method of Al-B-RE intermediate alloys, belong to material and smelting in new material technology field
Technology for gold field.
Background technology
Aluminium (Al), atomic number 13, atomic weight 27 is silvery white light metal, about 660 DEG C of fusing point, 2327 DEG C of boiling point, density
2.7g/cm3, with stronger toughness and tensile strength, excellent electric conductivity.Compared with conventional conducting materials metallic copper, conductance
Rate is the 62% of copper, but density is only the 33% of copper.Under the conditions of resistance identical, the volume ratio of copper and aluminium is 0.618, weight
Than being 2.03, therefore copper is replaced to be got more and more applications as conductive material with aluminium.It is well known, however, that technical pure
A number of impurity element, such as Si, Fe, Ti, V, Cr, Zr, Mn are usually contained in aluminium, these elements exist with dissolved state
In solid solution, the free electron of conductive material is easily absorbed, to fill the electron shell that they are not yet filled up, so as to cause material
Electric conductivity decline to a great extent.In order to eliminate influence of these elements to aluminium electric conductivity, generally requiring carries out purified treatment and removes this
A little impurity elements, i.e. in aluminium melting by adding special elementses, make it be chemically reacted with impurity element, generate
Insoluble compound, so as to reach removing impurity, improves the purpose of aluminium electric conductivity.At present, it is using most in purified treatment
Boron and rare earth element, its addition manner are various, such as add boron salt (KBF4) in Direct Electrolysis rare earth or borax, smelting furnace in electrolytic cell
Deng, wherein with intermediate alloy (Al-B, Al-RE) mode be added with simple to operate, addition it is easy to control, do not produce
Smog, the advantages of do not pollute electrolytic cell, not erosion of refractory, thus as current industrial topmost addition manner.
Substantial amounts of research shows that boron and rare earth have good catharsis to impurity element in aluminum melt, but in reality
Always used by single in the industrial applicability of border, cause clean-up effect fail to reach it is ultimate attainment, and in fact, both elements are in impurity
There is good complementary effect in the purification process of element, wherein, boron has very strong for transition elements such as Ti, V, Cr, Mn
Effect, high-melting-point, the boron compound of big density can be formed, afterwards by standing sedimentation or filtering removed；Rare earth is to mistake
Cross the effect very little of race's element impurity, but have for Fe and Si and obviously act on, but also conduction can be significantly improved
The performance such as the mechanics of material, corrosion-resistant and heat-resisting, therefore, if both elements are added can simultaneously, will lead aluminium
Various performances in electric process are lifted well.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of preparation method of Al-B-RE intermediate alloys, party's legal system
Standby Al-B-RE intermediate alloy impurity is few, B casting yields are high.
To achieve these goals, the technical solution adopted in the present invention is：A kind of preparation side of Al-B-RE intermediate alloys
Then method, the alloying reaction of potassium fluoborate and aluminium liquid first in intermediate frequency furnace adds rare earth element, then remove the gred, degasification,
Finally casting is obtained final product, and is comprised the following steps that：
(1) raw material is prepared：Ratio according to Al-B-RE intermediate alloys calculates the weight of each raw material, weighs standby；
(2) fine aluminium fusing：The aluminium ingot that will be weighed in intermediate frequency furnace is heated to 680~720 DEG C, until aluminium ingot melts completely
Chemical conversion aluminium liquid；
(3) elpasolite powder is added：The elpasolite powder on the middle berth of aluminium liquid surface；
(4)KBF4Feed for the first time：When elpasolite powder all melt after, in mechanical agitation to aluminium liquid in for the first time
Add KBF4, first time KBF4Addition is KBF4It is total to add the 65~75% of weight；Charging rate is controlled in 15~20kg/
Min, to reduce KBF4Volatilization；Add KBF4Continue 3~8min of mechanical agitation after end, then stand 5~15min, make KBF4
Fully reaction；
(5) slag blanket is removed：By KBF4A part is outwelled with the slag liquid produced after aluminium liquid reaction, melt is obtained；
(6)KBF4Feed for second：In mechanical agitation to melt in second add KBF4, second KBF4Addition
For first time adds KBF4Remaining KBF afterwards4, speed control is added in 10~15kg/min, to reduce KBF4Volatilization；Second
Secondary addition KBF4After end, continue 3~5min of mechanical agitation, then stand 5~15min；
(7) surface slag blanket treatment：Intermediate frequency furnace is warming up to 800~850 DEG C, is incubated, 3~5min of mechanical agitation, so
Bath surface slag blanket is removed afterwards；
(8) degasification and except Slag treatment：Lead to argon gas or nitrogen with graphite-pipe, throughput continuously rolls from bottom to up to allow melt
Boiling is advisable, and the residue in melt can continuous emersion surface；After 3~5min of ventilation, graphite-pipe is removed, source of the gas is closed, by surface
The residue of emersion is disposed；
(9) rare earth alloy is added：To be preheated in 400~500 DEG C of Al-10RE intermediate alloys block addition melt, treat Al-
After 10RE intermediate alloy blocks are completely melt, 3~8min of mechanical agitation；
(10) secondary degasification, slagging-off and cast：Using high speed rotary degassing machine, logical argon gas melt is carried out degasification 5~
10min, being mixed in the slag inside melt can float on the surface automatically, afterwards dispose these scum silica frost, cast, obtain pure
Al-B-RE intermediate alloys.
Elpasolite powder consumption is the 1.5~2.5% of aluminium liquid gross weight in step (3).
It is KAlF in the accessory substance-elpasolite powder produced in the Al-Ti-B intermediate alloys production process4With
K3AlF6Mass ratio 3~3.2:1 mixture.
Also contain Ti elements in the elpasolite powder, the mass fraction of Ti elements is less than 0.05%.
The amount that slag liquid is outwelled in step (5) is first time KBF4Add the 70~73% of weight.
CaF is added in the slag blanket processing procedure of step (7) surface2Auxiliary removes slag blanket, CaF2Addition be KBF4It is total to add
The 1~1.5% of weight.
The aperture of the graphite-pipe is 20mm.
Beneficial effect of the present invention：
1st, B casting yields (more than 80%) high.When traditional villiaumite method prepares Al-B intermediate alloys, temperature is high, KBF4Volatilization
Amount is big, and oxidization burning loss is serious, causes the casting yield of B element low.The present invention uses relatively low KBF4With the alloying of aluminium liquid
Temperature (680-720 DEG C), and charging rate is controlled, reduce KBF4Volatilization, and while charging while stir, KBF can be made4
Even is distributed in reaction interface, it is to avoid because of KBF4Accumulation and cause the problems such as hot-spot, product segregation, can increase again
KBF4Chemical reaction velocity and degree, so as to improve B casting yields, reduce production cost.
2nd, fluidity of molten is good.In aluminium liquid surface elder generation layer overlay elpasolite powder, the powder before alloying reaction
One layer of grain slag is formed on aluminium liquid surface after the fusing of end, on the one hand the grain slag can improve KBF4The viscous of slag is generated after being reacted with aluminium liquid
Consistence, promotes the separation of aluminium liquid and slag；On the other hand it is in aluminium liquid and KBF4Between raw material, KBF can be played4Raw material transition
The purpose of layer, makes KBF4Raw material uniformly reacts with aluminium liquid, it is to avoid Al liquid local location there is acutely chemical reaction and
The steep temperature rise phenomenon brought, so as to effectively inhibit AlB2To AlB12The transformation behavior of phase.Further, since the elpasolite powder
End is the accessory substance produced in Al-Ti-B intermediate alloy production processes, therefore powder the inside possesses a small amount of Ti elements.This portion
Dividing Ti can just destroy AlB2Reticulated structure, improve the mobility of melt, it is ensured that the slagging-off in later stage and casting process it is suitable
Profit is carried out, meanwhile, because the Ti constituent contents of this part do not interfere with the impurity of last Al-B intermediate alloys than relatively low again
Element total content.
3rd, quality is high.The present invention in Medium frequency induction reaction in furnace, using intermediate frequency furnace function composite by electromagnetic stirring and accompany by
Mechanical agitation during charging, has not only crushed some large-sized AlB2And Al4RE particles, make overall AlB2And Al4RE particle chis
Very little reduction, and be evenly distributed, effectively prevent AlB2And Al4The agglomeration of RE particles, eliminates segregation, effectively increases Al-
The quality of B-RE intermediate alloys.
4th, rare earth scaling loss is few.During addition Al-10RE intermediate alloys, 400 DEG C -500 DEG C are first preheated to, when melting it
Between significantly shorten, so as to reduce the time that RE elements exist at high temperature, reduce scaling loss degree, improve RE casting yields.
5th, cleanliness factor is high.The addition of RE effectively improves the mobility of alloy melt, is aiding in electromagnetic agitation and high speed
The effect of rotary degassing machine causes that slag inclusion is removed very clean in melt, therefore, the Al-B-RE intermediate alloys for finally giving have
Cleanliness factor very high.
6th, the compound phase of B is single.Research shows, at more than 960 DEG C, it may occur that AlB2To AlB12The reaction of transformation, and
AlB12The appearance of phase can decline the catharsis of Al-B-RE, thus it is guaranteed that occurring without AlB12It is mutually particularly significant.Work of the present invention
Skill effectively prevents the generation of localized hyperthermia's phenomenon due to having one layer of potassium ice slag blanket in combination reaction as transition zone, and
Other processes will not occur AlB also not less than 900 DEG C -950 DEG C2To AlB12Phase in version, the Al-B-RE for finally obtaining
B compound phases are single in intermediate alloy, so as to ensure the quality of Al-B-RE intermediate alloys.
7th, process is simple, it is easy to operate.There is no, using complicated equipment, cumbersome technique stream do not occur in the present invention yet
Journey, therefore the process is simple for manufacturing enterprise, it is easy to operate.
Brief description of the drawings
Specific embodiment of the invention is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is the metallograph of embodiment 1Al-3B-0.5RE intermediate alloys；
Fig. 2 is the metallograph of embodiment 2Al-4B-1RE intermediate alloys；
Fig. 3 is the metallograph of embodiment 3Al-5B-1RE intermediate alloys.
Specific embodiment
Specific embodiment of the invention is described in further detail with reference to embodiments.
The purity of aluminium ingot used of the invention is 99.7%, KBF4Purity be 98%.
Embodiment 1
The preparation method of the present embodiment Al-3B-0.5RE intermediate alloys, comprises the following steps that：
(1) raw material is prepared：Ratio according to Al-3B-0.5RE intermediate alloys calculates the weight of each raw material, weighs standby；
(2) fine aluminium fusing：Aluminium ingot 995kg is heated to 700 DEG C in intermediate frequency furnace, until aluminium ingot is completely melt into aluminium
Liquid, removes the impurity and oxide-film on aluminium liquid surface；
(3) elpasolite powder is added：Elpasolite powder 20kg is spread on aluminium liquid surface；
(4)KBF4Feed for the first time：After elpasolite powder all melts, while stirring to being added for the first time in aluminium liquid
KBF4245kg；Speed control is added in 18kg/min, to reduce KBF4Volatilization；Charging KBF4Continue to stir 8min after end,
Then 15min is stood, makes KBF4Fully reaction；
(5) slag blanket is removed：By KBF4180kg is outwelled with the slag blanket produced after aluminium liquid reaction, melt is obtained；
(6)KBF4Feed for second：While stirring KBF is added to second in melt4105kg, charging rate control exists
15kg/min, to reduce KBF4Volatilization；Add KBF second4After end, continue to stir 3min, then stand 8min；
(7) surface slag blanket treatment：Intermediate frequency furnace is warming up to 850 DEG C, insulation, mechanical agitation 3min outwells surface slag
Layer；5kg CaF are added simultaneously2Powder, neutralizes the liquid slag of remained on surface, and the slag that N-process is produced also is removed and done together
Only；
(8) degasification and except Slag treatment：Melt bottom is inserted with the logical argon gas of the graphite-pipe that a root hole footpath is 20mm or nitrogen, is led to
Tolerance with allow melt from bottom to up continuously rolling boiling be advisable, the residue in melt can continuous emersion surface；After ventilation 3min, move
Except graphite-pipe, source of the gas is closed, the residue of surface emersion is disposed；
(9) rare earth alloy is added：To be preheated in 450 DEG C of Al-10RE intermediate alloy blocks 50kg addition melts, treat Al-
After 10RE intermediate alloy blocks are completely melt, mechanical agitation 5min；
(10) secondary degasification, slagging-off and cast：Using high speed rotary degassing machine, logical argon gas carries out degasification 5min to melt,
Being mixed in the slag inside melt can float on the surface automatically, afterwards dispose these scum silica frost, cast, obtain pure Al-3B-
0.5RE intermediate alloys.
The composition of the Al-3B-0.5RE intermediate alloys of the present embodiment production is as shown in table 1.According to the actual heavy of raw material addition
Amount, theoretically calculating obtain Al-3B-0.5RE alloys, and actual product test obtains Al-2.51B-0.44RE alloys, because
Casting yield=the 0.44/0.5=88% of the casting yield=2.51/3=83.7% of this B, RE.In addition, in the middle of to Al-3B-0.5RE
Alloy carries out Metallographic Analysis, as a result sees Fig. 1, be can see in Fig. 1, and substantial amounts of particulate material is dispersed with α-Al matrixes,
This is the second phase that Al-B-RE intermediate alloys are generated in chemical reaction process.Research display, the gold that Al-B alloys may be generated
Compound has AlB between category2And AlB12But, if reaction temperature is less than 1000 DEG C, then can only obtain AlB2；And Al-RE alloys
It is general only to generate Al4RE；In addition, under the conditions of the present invention, the probability that B and RE chemically react is very low, substantially will not
There is REB4Or REB6, therefore, the Second Phase Particle for occurring in Fig. 1 is AlB2And Al4The mixing of RE.Yet with AlB2With
Al4RE particles are not accurately distinguished out in Fig. 1 in the no particularly apparent difference of the aspects such as color, pattern, distributed areas
AlB2And Al4RE.Through measurement, AlB2And Al4The size of RE particles is most of between 10-25 μm, the performance acted on for it
It is highly beneficial.
The Al-3B-0.5RE master alloy chemistries (wt.%) of table 1
| Sample | B | RE | Si | Fe | Ti | Al |
| Al-3B-0.5RE | 2.51 | 0.44 | 0.0887 | 0.193 | 0.0154 | Surplus |
Embodiment 2
The preparation method of the present embodiment Al-4B-1RE intermediate alloys, comprises the following steps that：
(1) raw material is prepared：Ratio according to Al-4B-1RE intermediate alloys calculates the weight of each raw material, weighs standby；
(2) fine aluminium fusing：Aluminium ingot 985kg is heated to 680 DEG C in intermediate frequency furnace, until aluminium ingot is completely melt into aluminium
Liquid, removes the impurity and oxide-film on aluminium liquid surface；
(3) elpasolite powder is added：Elpasolite powder 25kg is spread on aluminium liquid surface；
(4)KBF4Feed for the first time：After elpasolite powder all melts, while stirring to being added for the first time in aluminium liquid
KBF4306kg；Charging rate is controlled in 20kg/min, to reduce KBF4Volatilization；Add KBF4Continue to stir 5min after end,
Then 10min is stood, makes KBF4Fully reaction；
(5) slag blanket is removed：By KBF4215kg is outwelled with the slag blanket produced after aluminium liquid reaction, melt is obtained；
(6)KBF4Feed for second：While stirring KBF is added to second in melt4160kg, charging rate control exists
12kg/min, to reduce KBF4Volatilization；Add KBF second4After end, continue to stir 4min, then stand 5min；
(7) surface slag blanket treatment：Intermediate frequency furnace is warming up to 820 DEG C, insulation, mechanical agitation 4min outwells surface slag
Layer；6kg CaF are added simultaneously2Powder, neutralizes the liquid slag of remained on surface, and the slag that N-process is produced also is removed and done together
Only；
(8) degasification and except Slag treatment：Melt bottom is inserted with the logical argon gas of the graphite-pipe that a root hole footpath is 20mm or nitrogen, is led to
Tolerance with allow melt from bottom to up continuously rolling boiling be advisable, the residue in melt can continuous emersion surface；After ventilation 4min, move
Except graphite-pipe, source of the gas is closed, the residue of surface emersion is disposed；
(9) rare earth alloy is added：To be preheated in 500 DEG C of Al-10RE intermediate alloy blocks 100kg addition melts, treat Al-
After 10RE intermediate alloy blocks are completely melt, mechanical agitation 3min；
(10) secondary degasification, slagging-off and cast：Using high speed rotary degassing machine, logical argon gas carries out degasification 10min to melt,
Being mixed in the slag inside melt can float on the surface automatically, afterwards dispose these scum silica frost, cast, obtain pure Al-4B-
1RE intermediate alloys.
The composition of the Al-4B-1RE intermediate alloys of the present embodiment production is as shown in table 2.According to the actual heavy of raw material addition
Amount, theoretically calculating obtain Al-4B-1RE alloys, and actual product test obtains Al-3.32B-0.86RE alloys, therefore
Casting yield=the 0.86/1=86% of the casting yield=3.32/4=83% of B, RE.In addition, being carried out to Al-4B-1RE intermediate alloys
Metallographic Analysis, is as a result shown in Fig. 2, it can be seen that many AlB in Fig. 22And Al4RE hybrid particles, size is also relatively tiny, most of
Equally between 10-25 μm, the performance acted on for it is highly beneficial.
The Al-4B-1RE master alloy chemistries (wt.%) of table 2
| Sample | B | RE | Si | Fe | Ti | Al |
| Al-4B-1RE | 3.32 | 0.86 | 0.0912 | 0.207 | 0.0186 | Surplus |
Embodiment 3
The preparation method of the present embodiment Al-5B-1RE intermediate alloys, comprises the following steps that：
(1) raw material is prepared：Ratio according to Al-5B-1RE intermediate alloys calculates the weight of each raw material, weighs standby；
(2) fine aluminium fusing：Aluminium ingot 975kg is heated to 720 DEG C in intermediate frequency furnace, until aluminium ingot is completely melt into aluminium
Liquid, removes the impurity and oxide-film on aluminium liquid surface；
(3) elpasolite powder is added：Elpasolite powder 15kg is spread on aluminium liquid surface；
(4)KBF4Feed for the first time：After elpasolite powder all melts, while stirring to being added for the first time in aluminium liquid
KBF4378kg；Charging rate is controlled in 15kg/min, to reduce KBF4Volatilization；Add KBF4Continue to stir 15min after end,
Then 20min is stood, makes KBF4Fully reaction；
(5) slag blanket is removed：By KBF4286kg is outwelled with the slag blanket produced after aluminium liquid reaction, melt is obtained；
(6)KBF4Feed for second：While stirring KBF is added to second in melt4204kg, charging rate control exists
10kg/min, to reduce KBF4Volatilization；Add KBF second4After end, continue to stir 5min, then stand 15min；
(7) surface slag blanket treatment：Intermediate frequency furnace is warming up to 800 DEG C, insulation, mechanical agitation 5min outwells surface slag
Layer；8kg CaF are added simultaneously2Powder, neutralizes the liquid slag of remained on surface, and the slag that N-process is produced also is removed and done together
Only；
(8) degasification and except Slag treatment：Melt bottom is inserted with the logical argon gas of the graphite-pipe that a root hole footpath is 20mm or nitrogen, is led to
Tolerance with allow melt from bottom to up continuously rolling boiling be advisable, the residue in melt can continuous emersion surface；After ventilation 5min, move
Except graphite-pipe, source of the gas is closed, the residue of surface emersion is disposed；
(9) rare earth alloy is added：To be preheated in 400 DEG C of Al-10RE intermediate alloy blocks 100kg addition melts, treat Al-
After 10RE intermediate alloy blocks are completely melt, mechanical agitation 8min；
(10) secondary degasification, slagging-off and cast：Using high speed rotary degassing machine, logical argon gas carries out degasification 8min to melt,
Being mixed in the slag inside melt can float on the surface automatically, afterwards dispose these scum silica frost, cast, obtain pure Al-5B-
1RE intermediate alloys.
The composition of the Al-5B-1RE intermediate alloys of the present embodiment production is as shown in table 3.According to the actual heavy of raw material addition
Amount, theoretically calculating obtain Al-5B-1RE alloys, and actual product test obtains Al-4.12B-0.85RE alloys, therefore
Casting yield=the 0.85/1=85% of the casting yield=4.12/5=82.4% of B, RE.In addition, entering to Al-5B-1RE intermediate alloys
Row Metallographic Analysis, is as a result shown in Fig. 3, it can be seen that many AlB in Fig. 32And Al4RE hybrid particles, size is also relatively tiny, big portion
Divide same between 10-25 μm, the performance acted on for it is highly beneficial.
The Al-5B-1RE master alloy chemistries (wt.%) of table 3
| Sample | B | RE | Si | Fe | Ti | Al |
| Al-5B-1RE | 4.12 | 0.85 | 0.0988 | 0.213 | 0.0194 | Surplus |
Claims (7)
1. a kind of preparation method of Al-B-RE intermediate alloys, it is characterised in that potassium fluoborate and aluminium first in intermediate frequency furnace
The alloying reaction of liquid, then adds rare earth element, then remove the gred, degasification, finally casting obtains final product, comprises the following steps that：
(1) raw material is prepared：Ratio according to Al-B-RE intermediate alloys calculates the weight of each raw material, weighs standby；
(2) fine aluminium fusing：The aluminium ingot that will be weighed in intermediate frequency furnace is heated to 680~720 DEG C, until aluminium ingot is completely melt into
Aluminium liquid；
(3) elpasolite powder is added：The elpasolite powder on the middle berth of aluminium liquid surface；
(4)KBF4Feed for the first time：When elpasolite powder all melt after, in mechanical agitation to aluminium liquid in add for the first time
KBF4, first time KBF4Addition is KBF4It is total to add the 65~75% of weight；Charging rate is controlled in 15~20kg/min, with
Reduce KBF4Volatilization；Add KBF4Continue 3~8min of mechanical agitation after end, then stand 5~15min, make KBF4It is fully anti-
Should；
(5) slag blanket is removed：By KBF4A part is outwelled with the slag liquid produced after aluminium liquid reaction, melt is obtained；
(6)KBF4Feed for second：In mechanical agitation to melt in second add KBF4, second KBF4Addition is
Once add KBF4Remaining KBF afterwards4, speed control is added in 10~15kg/min, to reduce KBF4Volatilization；Add for second
Enter KBF4After end, continue 3~5min of mechanical agitation, then stand 5~15min；
(7) surface slag blanket treatment：Intermediate frequency furnace is warming up to 800~850 DEG C, insulation, mechanical agitation 3~5min, Ran Houqing
Except bath surface slag blanket；
(8) degasification and except Slag treatment：Lead to argon gas or nitrogen with graphite-pipe, throughput seethes with excitement to allow melt continuously to roll from bottom to up
It is advisable, the residue in melt can continuous emersion surface；After 3~5min of ventilation, graphite-pipe is removed, source of the gas is closed, by surface emersion
Residue dispose；
(9) rare earth alloy is added：To be preheated in 400~500 DEG C of Al-10RE intermediate alloys block addition melt, treat Al-10RE
After intermediate alloy block is completely melt, 3~8min of mechanical agitation；
(10) secondary degasification, slagging-off and cast：Using high speed rotary degassing machine, logical argon gas carries out 5~10min of degasification to melt,
Being mixed in the slag inside melt can float on the surface automatically, afterwards dispose these scum silica frost, cast, obtain pure Al-B-RE
Intermediate alloy.
2. the preparation method of Al-B-RE intermediate alloys according to claim 1, it is characterised in that potassium ice crystal in step (3)
Stone powder consumption is the 1.5~2.5% of aluminium liquid gross weight.
3. the preparation method of the Al-B-RE intermediate alloys according to claim any one of 1-2, it is characterised in that the potassium
It is KAlF in ice crystal powder4And K3AlF6Mass ratio 3~3.2:1 mixture.
4. the preparation method of Al-B-RE intermediate alloys according to claim 3, it is characterised in that the elpasolite powder
Also contain Ti elements in end, the mass fraction of Ti elements is less than 0.05%.
5. the preparation method of Al-B-RE intermediate alloys according to claim 1, it is characterised in that step outwells slag in (5)
The amount of liquid is first time KBF4Add the 70~73% of weight.
6. the preparation method of Al-B-RE intermediate alloys according to claim 1, it is characterised in that step (7) surface slag blanket
CaF is added in processing procedure2Auxiliary removes slag blanket, CaF2Addition be KBF4It is total to add the 1~1.5% of weight.
7. the preparation method of Al-B-RE intermediate alloys according to claim 1, it is characterised in that the hole of the graphite-pipe
Footpath is 20mm.
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| CN106521201A (en) * | 2016-11-07 | 2017-03-22 | 湖南金联星特种材料股份有限公司 | Preparing method for Al-Ti-RE intermediate alloy |
| CN107587005B (en) * | 2017-09-14 | 2019-11-01 | 深圳市中金环保科技有限公司 | A kind of scandium bearing master alloy and its preparation process |
| CN111349822B (en) * | 2020-03-20 | 2021-08-13 | 永城金联星铝合金有限公司 | Aluminum-titanium-boron-strontium-rare earth alloy wire and preparation method thereof |
| CN111424198A (en) * | 2020-04-09 | 2020-07-17 | 北京国网弘泰科技有限公司 | Corrosion-resistant aluminum alloy grounding material and manufacturing method thereof |
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| CN102424923B (en) * | 2011-11-29 | 2013-10-09 | 黄冈华尔铝合金有限公司 | Al-Ti-B-rare earth(RE) grain refiner and preparation method thereof |
| CN103074506B (en) * | 2013-01-09 | 2014-10-01 | 湖南金联星特种材料股份有限公司 | Two-step charging method for preparing high-quality Al-Ti-B intermediate alloy refiner |
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