CN104818411A - Rare-earth aluminum-magnesium alloy material and preparation method thereof - Google Patents
Rare-earth aluminum-magnesium alloy material and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a rare-earth aluminum-magnesium alloy material which comprises the following chemical components in percentage by weight: 0.08-0.35% of rare-earth element RE, 0.2-1.8% of Mg, at most 0.05% of other single impurities (at most 0.15% of total impurities), and the balance of aluminum. The rare-earth element is selected from one or a mixture of lanthanum, cerium, yttrium, praseodymium, neodymium and erbium. Compared with the common aluminum, the rare-earth aluminum-magnesium alloy material has the advantages of high strength, favorable elongation percentage, favorable sagging property and favorable wear resistance. By adding the rare earth and adding the technique which breaks through the traditional processing technique for aluminum-magnesium alloy line poles (extrusion after drawing or casting), a five-roller continuous-casting tandem mill can be adopted to perform infinite continuous production, thereby greatly enhancing the production efficiency. By adopting the high-temperature quick rolling, the alloy can be easily formed, thereby enhancing the mechanical productivity and prolonging the service life of the equipment wearing parts. Thus, the internal structure of the alloy is more compact and complete.
Description
Technical field
The present invention relates to a kind of rare-earth-Al-Mg alloy material and preparation method thereof, this material not only can be prepared and meet the built on stilts or middle strength aluminium alloy pole stock of covil construction industry, the requirement of wire rod, and can be widely used in communication signals line, shielding wire field etc.
Background technology
The energy, safety, environmental protection are the three large key issues being related to human survival and development, aluminium has that density is little, specific tenacity and specific rigidity high, corrosion-resistant, attractive and durable, to be shaped, can surface treatment, recyclable regeneration, can save energy a series of premium propertiess such as energy storage, applying aluminium is the important channel alleviating above-mentioned three large problems.Therefore aluminium is more and more subject to the favor of people, and its application has spread to each department of national economy and people and to have lived each side, instead of steel, copper material, timber and plastics, become a kind of important foundation material of human society in a lot of occasion.
Existing middle strength aluminium alloy material production mainly after extrusion molding forms or draws through repeatedly annealing with draw shaping, its production technique is too complicated loaded down with trivial details: traction: efficiency is low, production rate is slow, 8 tons, production capacity line one day, continuous casting and rolling 4 tons/hour, and need repeatedly anneal, cause cost high; Extrusion molding: woollen in the middle of ingot casting heating, extruding, be cut into middle woollen, heating, secondary extrusion, wire production, batch, process annealing, repeatedly wire drawing, cleaning or polishing, close, be up to the standards, pack, deliver goods; Cause material use efficiency low, produce many scrap stock, production cost is too high, and production process complexity is loaded down with trivial details.Therefore need a kind of production technique simple, the preparation method of the middle strength aluminium alloy material that production efficiency is high.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of technique simple, production efficiency is high, rare-earth-Al-Mg alloy material of middle intensity and preparation method thereof.Following technical scheme is adopted in order to realize this technical purpose:
A kind of rare-earth-Al-Mg alloy material, the chemical composition of this material and weight percent are:
Rare earth elements RE 0.08 ~ 0.35%; Mg 0.2 ~ 1.8%, other single impurity≤0.05%, impurity summation≤0.15%, surplus is aluminium.The rare earth element of trace is added in aluminium alloy, significantly can improve the metallographic structure of aluminium alloy, crystal grain thinning, remove gas and detrimental impurity in aluminium alloy, eliminate defects such as casting loose and thermal crack, thus put forward heavy alloyed intensity, improve processing characteristics, improve the thermotolerance of alloy, plasticity-and resistance to deformation power, improve hardness, corrosion resistance nature and painted, increase toughness, reduce alloy quenching susceptibility, the addition of rare earth in aluminium alloy is unsuitable too high, too raised to adverse effect, too lowly do not reach best effect again, therefore addition mass percent optimal selection in the alloy: 0.1 ~ 0.35%, aluminium rare earth intermediate alloy is provided by Inner Mongol rare earth research institute.
Rare-earth-Al-Mg alloy material of the present invention has following characteristic:
1, intensity is large, good percentage elongation, this aluminum alloy materials is when diameter 9.5mm, tensile strength: 120 ~ 180Mpa, unit elongation: be greater than 11%, conventional aluminium bar, tensile strength: 95 ~ 140Mpa, unit elongation: be greater than 6%, when diameter is less than 4.5mm, alloy wire tensile strength: be greater than 200Mpa, unit elongation: 2 ~ 3%, common aluminium, tensile strength: 140 ~ 190Mpa, unit elongation: 1.0 ~ 1.5%, 2, the arc property that hangs down is good, the ratio 9.5Km of the total pull-off force of full alloy high pressure twisted wire made of this alloy and its unit weight, and during the reinforcing bar aluminum stranded conductor that common aluminium is made, always break the ratio 7Km with its unit weight, 3, high abrasion, this alloy product abrasive wear resistance Brinell hardness: be greater than 60HB, common aluminium abrasive wear resistance Brinell hardness: 30 ~ 50HB.
Further, described rare-earth-Al-Mg alloy material, is characterized in that, rare earth elements RE 0.1 ~ 0.35%; Mg0.2 ~ 1.8%, other single impurity≤0.05%, impurity summation≤0.15%, surplus is aluminium.
Preferably, described rare earth element is selected from lanthanum, cerium, yttrium, praseodymium, neodymium, one or more the mixing in erbium.
On the other hand, present invention also offers a kind of preparation method of rare-earth-Al-Mg alloy material, it comprises the steps: melting, aluminium alloy preparation, refining and casting; Wherein:
1), melting: be aluminium liquid by aluminium ingot melting, then aluminium liquid imported in holding furnace, be warming up to 740 ~ 760 DEG C, be incubated and leave standstill;
2), aluminium alloy preparation: by step 1) in aluminium liquid in holding furnace transfer in refining furnace, add magnesium ingot and Al rare earth alloy successively, stir, make aluminium alloy and control the chemical composition of this aluminium alloy and weight percent is: RE0.08 ~ 0.35%; Mg 0.2 ~ 1.8%, other single impurity≤0.05%, impurity summation≤0.15%, surplus is aluminium;
3), refining: by spraying into the mixture of refining agent and nitrogen bottom refining furnace to step 2 in refining furnace) aluminium alloy that obtains carries out refining, add insulating covering agent alloy liquid afterwards and cover, and leave standstill;
4), casting: by step 3) aluminium alloy that obtains carries out degasification, slagging-off and purification, aluminium alloy is flowed in liquid filling machine cast afterwards.
Specifically, described step 2) the weight percent of Al rare earth alloy middle-weight rare earths control to be 9 ~ 12%, make the cleaning action of rare earth like this, metamorphism, alloying action etc. reach best effect.
Preferably, described melting step comprises: the aluminium liquid after fusing flows into holding furnace through the chute closed, and is warming up to 740 ~ 760 DEG C, is incubated and leaves standstill 20 ~ 40 minutes; And/or, described aluminium alloy preparation steps: the temperature of aluminum liquid in refining furnace adds magnesium ingot and Al rare earth alloy successively again 720 ~ 740 DEG C time.
Further, described refinement step is: by refining agent and nitrogen mixture by spraying into bottom refining furnace and moving in " well " in stove; Refining is carried out at twice, and nitrogen pressure control is: 0.1 ~ 0.2MPa, each refining time is 15 ~ 30min, and refining temperature controls at 705 ~ 715 DEG C.
Further, after refining, the aluminium alloy of 690 ~ 710 DEG C is flowed out from refining furnace and carry out casting step, the chute with heating function of the aluminium alloy flowed out from refining furnace through closing enters in filter plant and carries out coarse filtration, essence filter double filtration, aluminium alloy is flowed in liquid filling machine by level, airtight stopper noz(zle) and carries out low temperature casting afterwards, pouring temperature is 690 ~ 700 DEG C, casting rate is 0.2 ~ 0.22 m/min, during casting, temperature of cooling water used is 20 ~ 35 DEG C, cold water pressure is 0.2 ~ 0.35MPa, and it is 80 ~ 100m that cooling water flow controls
3/ h.
Further, described preparation method also comprises milling step: aluminium alloy enters to roll temperature and controls: 530 ~ 560 DEG C, stand motor speed turn controls at 490 ~ 510 revs/min, and the shaping aluminium bar of rolling goes out to roll speed: 3 ~ 7.2 meter per seconds, go out to roll temperature: 300 ~ 330 DEG C; Adopt Al and Alalloy continuous casting and rolling emulsion and water to carry out proportioning in proportion in the operation of rolling, in the mixed solution of wherein said emulsion and water, emulsion mass content is 10 ~ 12%, and mixeding liquid temperature is 40 ~ 60 DEG C, and mixed solution flow is: 60 ~ 80m
3/ h.
Compared with prior art, the present invention has following beneficial effect:
1, the preparation method of rare-earth-Al-Mg alloy material of the present invention, five can be adopted to take turns because adding rare earth to add the conventional machining process (traction or casting rear extrusion production) that breaches aluminum-magnesium alloy wire bar continuous seepage that continuous casting and continuous rolling mill carries out endless, substantially increases production efficiency like this.
2, the preparation method of rare-earth-Al-Mg alloy material of the present invention adopts the fast speed rolling of high temperature, so not only alloy easy-formation, improves construction machine productivity, the work-ing life of extension device consumable accessory, and makes alloy internal structure more closely with perfect.Make the fine-processing techniques such as follow-up drawing and extruding simply and not need to carry out annealing thermal treatment to the rod of metal alloy of rolling and can carry out precision work.
3. the production of this alloy wire (extrusion molding or traction) compared with traditional technology, mother metal reaches 99.9% utilization, and can drawing after not needing repeatedly to anneal.
4, the rare-earth-Al-Mg alloy strength of materials that obtains of preparation method of the present invention is large, good percentage elongation, this aluminum alloy materials is when diameter 9.5mm, under soft state state, its tensile strength: 140 ~ 180Mpa, unit elongation: be greater than 13% ~ 20%, conventional aluminium bar under the state of hard state, tensile strength: 130 ~ 150Mpa, unit elongation: 6% ~ 8%, when diameter is less than 4.5mm, alloy wire tensile strength: be greater than 200Mpa, unit elongation: 2 ~ 3%, common aluminium, tensile strength: 140 ~ 190Mpa, unit elongation: 1.0 ~ 1.5%
5, the rare-earth-Al-Mg alloy material that preparation method of the present invention the obtains arc property that hangs down is good, ratio 9 ~ the 11Km of the total pull-off force of full alloy high pressure twisted wire made of this alloy and its unit weight, and during the reinforcing bar aluminum stranded conductor that common aluminium is made, always broken the ratio 6 ~ 8Km with its unit weight.
6, the rare-earth-Al-Mg alloy material high abrasion that obtains of preparation method of the present invention, this alloy product abrasive wear resistance Brinell hardness: be greater than 60 ~ 100HRB, common aluminium abrasive wear resistance Brinell hardness: 30 ~ 50HB.
Embodiment
In order to make the object, technical solutions and advantages of the present invention definitely, below the preferred embodiments of the present invention are described in detail.
Embodiment 1
A kind of rare-earth-Al-Mg alloy material of the present embodiment, it is prepared in accordance with the following steps:
(1). melting: by the continuous smelting in the soaring smelting furnace that speed of melting is 8 tons/hour of the remelting electrician aluminium ingot of Al99.70E, through the holding furnace of closed chute inflow capacity 8 tons, (this holding furnace is provided with two dewatering outlets to the aluminium liquid of fusing, and 1, first dewatering outlet is lower than burner hearth bottom 5CM.2, the 2nd dewatering outlet is higher than burner hearth bottom 5CM) in heat up (in temperature-rise period, utilize insulating covering agent to cover, prevent the too much scaling loss of aluminium liquid, and aluminium liquid inhales hydrogen) and insulation leaves standstill 30 minutes: temperature remains on 740 ~ 760 DEG C, temperature is too low, the reactivity of metal is inactive, temperature is too high, and metal liquid easily inhales hydrogen.This object: utilize the proportion of each metal and impurity different, gently float, heavily sink, carry out simply purifying inside.
(2) aluminium alloy preparation: the 2nd dewatering outlet of opening holding furnace, aluminium liquid is transferred in refining furnace, temperature of aluminum liquid is 730 degree time, add magnesium ingot successively, AlRE10, stirs, and makes the abundant alloying of each element and homogenizing, the chemical composition content of rod of metal alloy base major alloy controls: Mg:0.2 ~ 1.8%, RE:0.1 ~ 0.35%.
(3) refining: by the aluminium alloy be equipped with, sampling is carried out direct-reading spectrometer and is carried out chemical composition analysis, after its content reaches requirement, carries out refining, method of refining: special for aluminum magnesium alloy No. 2 refining agents are mixed with the nitrogen of purity 99.99%, by electronic refining duster, refining agent and mixed gas are being sprayed into from burner hearth bottom 5 centimeters, and the motion in " well " in stove, refining is carried out at twice, each refining agent 5KG, nitrogen pressure: 0.1 ~ 0.2MPa, each refining time is 20min, refining temperature: 710 ± 5 DEG C, refining dosage is few, air pressure is too low, time does not reach requirement, temperature is too low, its refining effect is not good, but its parameter superelevation requirement, not only refining effect is not good, play side effect on the contrary, refining is complete, and heating aluminum magnesium alloy insulating covering agent alloy liquid covers, and melt leaves standstill 20 minutes.Insulating covering agent and refining agent outsourcing.
(4) cast: the aluminum alloy melt of 700 ± 5 DEG C flows out from refining furnace dewatering outlet, through what close, with the chute of heating, through online double-stage filtering case, reach online degasification, slagging-off and purification, afterwards by horizontal, five wheel type continuous casting machines of the stopper noz(zle) inflow H type of closed carry out crystallization, solidify and cool.
A, double-stage filtering case principle: aluminium alloy reaches online degasification, slagging-off and cleaning action by thick level and smart level double filtration.Coarse filtration: adopt size 308, the German import ceramic filter plate of order number 30ppi, by thicker contaminant filter; Essence level is filtered: adopt size 508, the German import screen plate of order number 80ppi thus reach the cleaning action of degasification, slagging-off.
B, discharge water temperature and the airtight chute combined that heats with flame of 700 ± 5 DEG C completely avoid the hydrogen of suction again in aluminum alloy melt stove and oxygen uptake (at present, most of chute all adopts open).
C, level, airtight stopper noz(zle) prevent the suction hydrogen of stopper noz(zle) place aluminum alloy melt and the generation of oxide skin and are involved in aluminum alloy ingot, affect quality product.(at present, the casting great majority adopted are all open types, and the casting mode angled with crystallizing wheel).
D, low temperature is cast, rapid crystallization cooled and solidified thus make the refinement more of alloy pig crystal grain, (this step of the interpolation of rare earth is not had to reach, rare earth significantly can improve the metallographic structure of aluminium alloy, crystal grain thinning, removes gas and detrimental impurity in aluminium alloy, eliminates defects such as casting loose and thermal crack).Pouring temperature: 690 ~ 700 DEG C, casting rate: 0.2 ~ 0.22 m/min, temperature of cooling water 20 ~ 35 DEG C, cold water pressure is 0.2 ~ 0.35MPa, cooling water flow: 80 ~ 100m
3/ h.Above parameter can make ingot casting grain refining, and alloy cooled and solidified alloying constituent is even, during high temperature casting, form trapezoidal ingot due to continuous caster, thus make to solidify uneven, segregation, inside alloy ingot with the crystal grain of outside inconsistent and uneven components.
A, double-stage filtering case principle: aluminium alloy reaches online degasification, slagging-off and cleaning action by thick level and smart level double filtration.Coarse filtration: adopt size 308, the German import ceramic filter plate of order number 30ppi, by thicker contaminant filter; Essence level is filtered: adopt size 508, the German import screen plate of order number 80ppi thus reach the cleaning action of degasification, slagging-off.
B, discharge water temperature and the airtight chute combined that heats with flame of 700 ± 5 DEG C completely avoid the hydrogen of suction again in aluminum alloy melt stove and oxygen uptake (at present, most of chute all adopts open).
C, level, airtight stopper noz(zle) prevent the suction hydrogen of stopper noz(zle) place aluminum alloy melt and the generation of oxide skin and are involved in aluminum alloy ingot, affect quality product.(at present, the casting great majority adopted are all open types, and the casting mode angled with crystallizing wheel).Low temperature is cast, rapid crystallization cooled and solidified thus make the refinement more of alloy pig crystal grain, (this step of the interpolation of rare earth is not had to reach, rare earth significantly can improve the metallographic structure of aluminium alloy, crystal grain thinning, remove gas and detrimental impurity in aluminium alloy, eliminate defects such as casting loose and thermal crack).Pouring temperature: 680 ~ 690 DEG C, casting rate: 0.2 ~ 0.22 m/min, temperature of cooling water 20 ~ 35 DEG C, cold water pressure is 0.2 ~ 0.35MPa, cooling water flow: 80 ~ 100 cubic meters/hour.Above parameter can make ingot casting grain refining, and alloy cooled and solidified alloying constituent is even, during high temperature casting, form trapezoidal ingot due to continuous caster, thus make to solidify uneven, segregation, inside alloy ingot with the crystal grain of outside inconsistent and uneven components.
(5) rolling: the fast speed rolling of high temperature, due to the intensity of rod of metal alloy and hardness all higher, therefore the fast speed rolling of high temperature must be taked, the fast speed rolling of high temperature not only makes alloy easy-formation, improve construction machine productivity, the work-ing life of extension device consumable accessory, and make alloy internal structure more closely with perfect, the more important thing is: make alloy obtain more perfect processing characteristics, make the fine-processing techniques such as follow-up drawing and extruding simple, and do not need that annealing thermal treatment is carried out to the rod of metal alloy of rolling and can carry out precision work, thus enhance productivity.Aluminium alloy enters to roll temperature: 530 ~ 560 DEG C, stand motor rotating speed 490 ~ 510 revs/min, adopt in the operation of rolling WD-6 Al and Alalloy continuous casting and rolling emulsion and water on request proportioning carry out the lubrication and cooling to equipment and alloy pig, in the mixed solution of emulsion and water, emulsion mass content is 10 ~ 12, %, mixeding liquid temperature is 50 ± 10 DEG C, mixed solution flow: 60 ~ 80m
3/ h, rolling is rolled by the double-roller type of the alternately rolling mutually of the first and second road vertical and horizontal formulas above, after rolling pass adopt Y type 3 roll-type to be rolled, the rod of metal alloy diameter of roll forming can determine according to the rolling pass quantity taked: can rolling diameter 15mm, 12mm, 9.5mm; The shaping aluminium bar of rolling goes out to roll speed: 3 ~ 7.2 meter per seconds, go out to roll temperature: 300 ~ 330 DEG C.
Through measuring, the rare-earth-Al-Mg alloy material that the present embodiment is obtained, its chemical constitution is: rare earth elements RE 0.25%; Magnesium Mg0.65%, silicon Si0.02%, copper Cu≤0.005%, other single impurity≤0.05% of chromium Cr0.02%, impurity summation≤0.15%, surplus is aluminium.
Detect the properties of the rare earth iron copper alloy wire that the present embodiment obtains, result is as follows:
Detection method: ARUN PolySpek-J direct-reading spectrometer, WDL-50 electronic type universal material testing machine, the full-automatic direct current resistance measurer of DX200H, 560RSS is aobvious Rockwell hardometer totally; Detect data:
Alloy material under normal temperature, normal pressure state, its tensile strength of diameter 9.5mm: 145MPa, elongation: 15%; 20 DEG C of direct current resistances: 32.65n Ω mm2.m, 20 DEG C of electric conductivity: 53.0%IACS (please polishing Chinese full name this be the unit symbol of electric conductivity), diameter 3.05mm, tensile strength: 215Mpa, elongation: 2.5%, 20 DEG C of direct current resistances: 32.95n Ω mm2.m, 20 DEG C of electric conductivity: 52.6%IACS.The present embodiment alloy product abrasive wear resistance Rockwell hardness is 65HRB.
The aluminium alloy rod that aforesaid way provides can directly draw, by diameter 9.5 rod of metal alloy by slide or non-sliding type Al and Alalloy continuously big or middle cold drawing bench draw the alloy wire that directly can become different size and shape, do not need centre repeatedly to anneal once to be drawn to as being drawn into aluminum alloy round line: as diameter 1.0 ~ 6.6mm etc., can be other shapes yet.B, as aluminum alloy wire drawing become diameter to be 0.2mm, carries out continuous annealing, annealing temperature when aluminum alloy wire drawing is 1.0mm to diameter: 350 DEG C, the time: 1 ~ 2h.
Existing middle strength aluminium alloy material production mainly after extrusion molding forms or draws through repeatedly annealing with draw shaping, its production technique is too complicated loaded down with trivial details: traction: efficiency is low, production rate is slow, 8 tons, production capacity line one day, continuous casting and rolling 4 tons/hour, and need repeatedly anneal, cause cost high; Extrusion molding: woollen in the middle of ingot casting heating, extruding, be cut into middle woollen, heating, secondary extrusion, wire production, batch, process annealing, repeatedly wire drawing, cleaning or polishing, close, be up to the standards, pack, deliver goods; Cause material use efficiency low, produce many scrap stock, production cost is too high, and production process complexity is loaded down with trivial details.And middle strength aluminium alloy material, process simplification that my company produces, aluminium alloy smelting, continuous casting and rolling, aluminium alloy rod base, work in-process, continuous drawing, finished product, packing.
This aluminum alloy materials is widely used in the application of the aluminum alloy materials of the industries such as electric wire, communication signals, industry and residential hardware.
Content described in this specification sheets embodiment is only enumerating the way of realization of inventive concept; protection scope of the present invention should not be regarded as being only limitted to the specific form that embodiment is stated, protection scope of the present invention also relates to those skilled in the art and conceives the equivalent technologies means that can expect according to the present invention.According to acclimation method of the present invention or ecological system degradation method, just changing kind, is also within protection scope of the present invention.
Claims (10)
1. a rare-earth-Al-Mg alloy material, is characterized in that, the chemical composition of this material and weight percent are:
Rare earth elements RE 0.08 ~ 0.35%; Mg 0.2 ~ 2.0%, other single impurity≤0.05%, impurity summation≤0.15%, surplus is aluminium.
2. rare-earth-Al-Mg alloy material according to claim 1, is characterized in that, rare earth elements RE 0.1 ~ 0.35%; Mg 0.2 ~ 1.8%, other single impurity≤0.05%, impurity summation≤0.15%, surplus is aluminium.
3. rare-earth-Al-Mg alloy material according to claim 1 and 2, is characterized in that, wherein said rare earth element is selected from lanthanum, cerium, yttrium, praseodymium, neodymium, one or more the mixing in erbium.
4. a preparation method for rare-earth-Al-Mg alloy material, is characterized in that, it comprises the steps: melting, aluminium alloy preparation, refining and casting; Wherein:
1), melting: be aluminium liquid by aluminium ingot melting, then aluminium liquid imported in holding furnace, be warming up to 740 ~ 760 DEG C, be incubated and leave standstill;
2), aluminium alloy preparation: by step 1) in aluminium liquid in holding furnace transfer in refining furnace, add magnesium ingot and Al rare earth alloy successively, stir, make aluminium alloy and control the chemical composition of this aluminium alloy and weight percent is: RE0.08 ~ 0.35%; Mg 0.2 ~ 1.8%, other single impurity≤0.05%, impurity summation≤0.15%, surplus is aluminium;
3), refining: by spraying into the mixture of refining agent and nitrogen bottom refining furnace to step 2 in refining furnace) aluminium alloy that obtains carries out refining, add insulating covering agent alloy liquid afterwards and cover, and leave standstill;
4), casting: by step 3) aluminium alloy that obtains carries out degasification, slagging-off and purification, aluminium alloy is flowed in liquid filling machine cast afterwards.
5. preparation method according to claim 4, is characterized in that, described step 2) Al rare earth alloy middle-weight rare earths weight percent control be 9 ~ 12%.
6. preparation method according to claim 4, is characterized in that, described rare earth element is selected from lanthanum, cerium, yttrium, praseodymium, neodymium, one or more the mixing in erbium.
7. preparation method according to claim 4, is characterized in that, described melting step comprises: the aluminium liquid after fusing flows into holding furnace through the chute closed, and is warming up to 740 ~ 760 DEG C, is incubated and leaves standstill 20 ~ 40 minutes; And/or, described aluminium alloy preparation steps: the temperature of aluminum liquid in refining furnace adds magnesium ingot and Al rare earth alloy successively again 720 ~ 740 DEG C time.
8. preparation method according to claim 4, is characterized in that, described refinement step is: by refining agent and nitrogen mixture by spraying into bottom refining furnace and moving in " well " in stove; Refining is carried out at twice, and nitrogen pressure control is: 0.1 ~ 0.2MPa, each refining time is 15 ~ 30min, and refining temperature controls at 705 ~ 715 DEG C.
9. preparation method according to claim 4, it is characterized in that, after refining, the aluminium alloy of 690 ~ 710 DEG C is flowed out from refining furnace and carry out casting step, the chute with heating function of the aluminium alloy flowed out from refining furnace through closing enters in filter plant and carries out coarse filtration, essence filter double filtration, aluminium alloy passes through level afterwards, airtight stopper noz(zle) flows in liquid filling machine and carries out low temperature casting, pouring temperature is 690 ~ 700 DEG C, casting rate is 0.2 ~ 0.22 m/min, during casting, temperature of cooling water used is 20 ~ 35 DEG C, cold water pressure is 0.2 ~ 0.35MPa, it is 80 ~ 100m that cooling water flow controls
3/ h.
10. preparation method according to claim 4, it is characterized in that, described preparation method also comprises milling step: aluminium alloy enters to roll temperature and controls: 530 ~ 560 DEG C, stand motor speed turn controls at 490 ~ 510 revs/min, the shaping aluminium bar of rolling goes out to roll speed: 3 ~ 7.2 meter per seconds, go out to roll temperature: 300 ~ 330 DEG C; Adopt Al and Alalloy continuous casting and rolling emulsion and water to carry out proportioning in proportion in the operation of rolling, in the mixed solution of wherein said emulsion and water, emulsion mass content is 10 ~ 12%, and mixeding liquid temperature is 40 ~ 60 DEG C, and mixed solution flow is: 60 ~ 80m
3/ h.
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