CN104805340A - Rare earth aluminium-magnesium-silicon alloy material and preparation method thereof - Google Patents

Rare earth aluminium-magnesium-silicon alloy material and preparation method thereof Download PDF

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CN104805340A
CN104805340A CN201510264286.9A CN201510264286A CN104805340A CN 104805340 A CN104805340 A CN 104805340A CN 201510264286 A CN201510264286 A CN 201510264286A CN 104805340 A CN104805340 A CN 104805340A
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alloy
aluminium
rare earth
refining
aluminum
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CN201510264286.9A
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CN104805340B (en
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熊春课
王高宝
方贻涛
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广西友合铝材有限公司
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    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/06Alloys based on aluminium with magnesium as the next major constituent
    • C22C21/08Alloys based on aluminium with magnesium as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/026Alloys based on aluminium
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/02Making alloys by melting
    • C22C1/03Making alloys by melting using master alloys
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C1/00Making alloys
    • C22C1/06Making alloys with the use of special agents for refining or deoxidising
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/12Alloys based on aluminium with copper as the next major constituent
    • C22C21/14Alloys based on aluminium with copper as the next major constituent with silicon
    • CCHEMISTRY; METALLURGY
    • C22METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22CALLOYS
    • C22C21/00Alloys based on aluminium
    • C22C21/12Alloys based on aluminium with copper as the next major constituent
    • C22C21/16Alloys based on aluminium with copper as the next major constituent with magnesium

Abstract

The invention relates to a rare earth aluminium-magnesium-silicon alloy material and a preparation method thereof. The chemical components of the material and weight percentages are as follows: 0.08 to 0.35 percent of rare earth element RE, 0.7 to 1.5 percent of Mg and Si in total, 0 to 0.46 percent of Cu, 0 to 0.4 percent of Cr, 0.05 percent or less of other individual impurity and the balance of aluminium; the weight ratio of Mg to Si is 1.5 to 1.8:1, the total weight of Cu and Cr is less than 0.75 percent, and the sum of the impurities is less than or equal to 0.15 percent; one or the mixture of more than two of lanthanum, cerium, yttrium, praseodymium, neodymium and erbium is chosen as the rare earth element. The tensile strength of the rare earth aluminium-magnesium-silicon alloy material disclosed by the invention is high, and is two times as high as the tensile strength of ordinary hard state aluminium material. While conductivity is the same, the tensile strength of the rare earth aluminium-magnesium-silicon alloy material is 1.5 times as high as a copper wire, and the conductivity of the product is higher than the standard of International Electrotechnical Commission.

Description

A kind of rare earth Aludur material and preparation method thereof
Technical field
The present invention relates to a kind of rare earth Aludur material and preparation method thereof, this material not only can prepare the requirement meeting built on stilts aluminium-magnesium-slicon alloy wire, and can be widely used in requiring all higher communication signals line, shielding wire field etc. to intensity and conduction.
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 aluminium alloy pipe is due to the deficiency in intensity, corrosion-resistant and production technique, and production technique is too complicated loaded down with trivial details, and production cost is too high, and the tubing properties produced is unstable, not comprehensively, often occurs waste product.Therefore, necessary optimized alloy composition and production technique, reduce costs, raise the efficiency to obtain high strength, the alloy material that the over-all propertieies such as high corrosion resistant are good.
Along with the development of aluminum alloy materials, using aluminum alloy materials as the wire of conductor material and reinforcement material at home field operation be increasingly widely used, its representation type is all aluminium alloy twisted wire, aluminum stranded wire of aluminum alloy core, aluminium alloy communication signals line, aluminium alloy shielding wire etc., traditional aluminum alloy materials material composition and performance relatively single, production technique relative complex is loaded down with trivial details, production efficiency is low, production cost is high, properties is comprehensive not, what have pursues intensity to sacrifice resistance, and what have pursues intensity to sacrifice processing characteristics, and what have pursues resistance to sacrifice intensity.Aluminum alloy materials improved and the process of technique through composition in the last few years, aluminium alloy capability and production technique are improved, but and fail to make these performances to reach best and optimum matches well, what have is only suitable for laboratory, can not apply enterprise and produce in enormous quantities; What have attends to one thing and lose sight of another; What have ignores cost, disregards efficiency; Therefore also need further improvement, develop a kind of performance more excellent, more comprehensively, composition proportion is best, and technical process is simple, easy and simple to handle, low cost, the high efficiency economical and practical aluminum alloy materials being applicable to enterprise and producing in enormous quantities.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of high corrosion resistant, high strength rare earth Aludur material.Following technical scheme is adopted in order to realize this technical purpose:
A kind of rare earth Aludur material, it is characterized in that, the chemical composition of this material and weight percent are:
The chemical composition of this material and weight percent are: rare earth elements RE 0.08 ~ 0.35%; The total amount 0.7 ~ 1.5%, Mg of Mg and Si and the mass ratio of Si are that 1.5 ~ 1.8:1, Cu:0 ~ 0.46%, Cr:0 ~ 0.4%, Cu and Cr gross weight is less than 0.75%, other single impurity≤0.05%, impurity summation≤0.15%, and surplus is aluminium; Wherein said rare earth element is selected from lanthanum, cerium, yttrium, praseodymium, neodymium, one or more the mixing in erbium.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 Aludur material of the present invention has following characteristic:
Tensile strength is large, good percentage elongation, and after annealing, under alloy material normal temperature, normal pressure state, alloy material, when continuous casting and rolling becomes diameter 9.5mm pole stock, records tensile strength 150 ~ 220Mpa, does unit elongation is greater than 10% (have the individual upper limit?).Does at 20 DEG C, DC resistivity is less than 34.50n Ω .m (have individual lower limit?), when being drawn into round aluminum steel: record that tensile strength is greater than 290Mpa (has the individual upper limit?), does unit elongation is greater than 3.5% (have the individual upper limit?), at 20 DEG C, DC resistivity is less than 32.84n Ω .m
Described material also comprises the chemical composition of following weight percent: Cu:0.1 ~ 0.46%, Cr:0.02 ~ 0.4%, and Cu and Cr gross weight is less than 0.75%.
Described material chemical composition and weight percent are: RE:0.1 ~ 0.35%; Si:0.3 ~ 0.9%, Mg:0.3 ~ 0.9%, the wherein total amount 0.7 ~ 1.5% of magnesium and silicon, this is chemical composition for the preparation of the rod of metal alloy base major alloy of electric wire and content.Described material chemical composition and weight percent are: RE:0.1 ~ 0.35%; Si:0.2 ~ 0.8%, Mg:0.35 ~ 1.2%, the wherein total amount 0.7 ~ 1.5% of magnesium and silicon, this is chemical composition and the content of the bar base major alloy of extruding aluminium alloy pipe.
On the other hand, present invention also offers a kind of preparation method of rare earth Aludur material, it comprises the steps: melting, aluminium alloy preparation, refining and casting; Wherein:
1), melting: be aluminium liquid by aluminium ingot melting, aluminium liquid imported in holding furnace, is warming up to 740 ~ 760 DEG C, is incubated and leaves standstill;
2), aluminium alloy preparation: by step 1) in aluminium liquid in holding furnace transfer in refining furnace, add master alloy successively and magnesium ingot stirs, make aluminium alloy and control the chemical composition of this aluminium alloy and weight percent is: rare earth element 0.08 ~ 0.35%; The total amount 0.7 ~ 1.5%, Mg of Mg and Si and the mass ratio of Si are that 1.5 ~ 1.8:1, Cu:0 ~ 0.46%, Cr:0 ~ 0.4%, Cu and Cr gross weight is less than 0.75%, other single impurity≤0.05%, impurity summation≤0.15%, and 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.
Described step 2) master alloy be the combination of aluminum silicon alloy and rare earth alloy, or aluminum silicon alloy, aluminum-copper alloy, aluminum chromium and Al rare earth alloy combine, in wherein said aluminium alloy, the control of Cu and Cr weight percent is: Cu:0.1 ~ 0.46%, Cr:0.02 ~ 0.4%, Cu and Cr gross weight is less than 0.75%.
Preferably, described rare earth element is selected from lanthanum, cerium, yttrium, praseodymium, neodymium, one or more the mixing in erbium.
Preferably, described melting step comprises: the aluminium liquid after fusing flows in 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 aluminum silicon alloy, Al rare earth alloy and magnesium ingot again 745 ~ 755 DEG C time; Or add aluminum silicon alloy, aluminum-copper alloy, aluminum chromium, Al rare earth alloy and magnesium ingot.
Wherein, described aluminum silicon alloy preparation: the Pure Silicon Metal of more than aluminium liquid bottom aluminium ingot or holding furnace and silicon purity 99.8% content (preferably) is founded, is then cast into ingot; The preparation of aluminum-copper alloy: aluminium liquid and electrolytic copper plate bottom aluminium ingot or holding furnace are founded, is then cast into ingot; The preparation of aluminum chromium: the chromium metal of aluminium liquid bottom aluminium ingot or holding furnace and chromium purity more than 98% (preferably) is founded, is then cast into ingot.
Preferably, 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 715 ~ 725 DEG C.
Preferably, 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 is to reach degasification, slagging-off, cleaning action, aluminium alloy passes through level afterwards, airtight stopper noz(zle) flows in liquid filling machine and carries out low temperature casting, pouring temperature is 680 ~ 690 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.
Preferably, 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 in the operation of rolling Al and Alalloy continuous casting and rolling emulsion and water on request proportioning carry out carrying out lubrication and cooling to rolling equipment and alloy pig, in the mixed solution of described emulsion and water, emulsion mass content is 10 ~ 12%, mixeding liquid temperature is 40 ~ 70 DEG C, and mixed solution flow is: 60 ~ 80m 3/ h.
Further, described preparation method is obtained that rare earth Aludur material has following characteristic:
1. product tensile strength is high, is 2 times of the hard state state of conventional aluminium material.When electric conductivity is identical, tensile strength is 1.5 times of copper cash, and the conductivity of product is higher than International Electrotechnical Commission Standard;
2. surface hardness is high, wear resistance good, and wear resisting property is about greater than more than 2 times than general aluminum raising;
3. corrosion resistance is better than copper and other aluminum alloy materials, and its fatigue resistance exceeds 50% than common aluminium, long service life;
4. product is high pressure resistant, has stable opposing short-circuit current performance, and opposing short-circuit current performance is only second to copper;
5. have excellent unit elongation, construction crimping is simple, processing and good welding performance.This product is squeezed into aluminium-alloy pipe and is easy to enlarging and flawless.During aluminum alloy wire drawing, diameter can be pulled to more than 0.15mm;
6. utilization rate of electrical is high, under voltage of alternating current effect, without magnetic hysteresis loss and Phenomenon of Eddy-Current.
Compared with prior art, the present invention has following beneficial effect:
1, obtained rare earth Aludur material has excellent anticorrosive, anti-fatigue performance: erosion resistance is better than copper, and general aluminum repeatedly bending is easily broken, and material of the present invention not easily.
2, (herein how to determine in the case of a high temperature by high temperature for rare earth Aludur material of the present invention?), resistance is relatively stable and have low contact resistance.
3, snappiness, good processability, long service life; Can be processed that to be drawn to diameter be 0.15mm; 10 years work-ing life of general aluminum, and product of the present invention can reach 40 years.
4. but master alloy selected by all oneself is produced, and not only ensure that the quality stability of master alloy, and reduce production cost, enhance productivity.
5. rare earth Aludur material of the present invention not only can prepare the requirement meeting built on stilts aluminium-magnesium-slicon alloy wire, and technique is simple, high-level efficiency, high-performance, easily process, this pole stock can be drawn to the filament that diameter is 0.2mm, therefore can be widely used in requiring all higher field to intensity and conduction: as, communication signals line, shielding wire etc.
6. not only properties is superior for the Commercial cultivation continuous extruding technology of this compo pipe, and compared with traditional technology, mother metal reaches 99.9% utilization, and does not need to increase extra Water Quenching, direct-on-line shrend.
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 Aludur 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) interior intensification (utilize insulating covering agent to cover in temperature-rise period, prevent the too much scaling loss of aluminium liquid, and aluminium liquid suction hydrogen) and insulation leaves standstill 30 minutes: temperature remains on 740 ~ 760 DEG C.Temperature is too low, and 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 750 degree time, add aluminum silicon alloy AlSi20 successively, aluminum-copper alloy AlCu50, aluminum chromium AlCr20, Al rare earth alloy AlRE10, magnesium ingot, stir, make an abundant alloying of element and homogenizing.The weight percent of each chemical composition controls: rare earth elements RE 0.08 ~ 0.35%; The total amount 0.7 ~ 1.5%, Mg of Mg and Si and the mass ratio of Si are that 1.73:1, Cu:0 ~ 0.46%, Cr:0 ~ 0.4%, Cu and Cr gross weight is less than 0.75%, other single impurity≤0.05%, and impurity summation≤0.15%, surplus is aluminium.
(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 in stove, become " well " motion, refining is carried out at twice, each refining agent 5KG, nitrogen pressure: 0.1 ~ 0.2MPa, each refining time is 20min, refining temperature: 720 ± 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).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 ~ 80 cubic meters/hour, rolling is rolled by the double-roller type of the alternately rolling mutually of the first and second road vertical and horizontal formulas above, rolling pass adopts Y type 3 roll-type to be rolled below, 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.
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 be drawn into the alloy wire of different size and shape, as circle: diameter 1.0,2.0 etc. also can be umbellate forms.The correlated performance requirement of high voltage overhead alloy wire can be met after alloy wire is carried out solution treatment+artificial aging.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: 400 DEG C, the time: 1 ~ 2h.
Through measuring, the rare earth Aludur material that the present embodiment is obtained, its chemical constitution is: rare earth elements RE: 0.25%; Magnesium Mg:0.55%, silicon Si:0.32%, copper Cu:0.03%, chromium Cr:0.05%, other single impurity≤0.05%, 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,
Detect data:
Alloy material after annealing is under normal temperature, normal pressure state, and continuous casting and rolling Direct Rolling becomes its tensile strength of diameter 9.5mm: 176MPa, elongation: 13%; 20 DEG C of direct current resistances: 32.14n Ω .m, 20 DEG C of electric conductivitys: 53.8% IACS; Diameter 3.05mm is become, tensile strength 325MPa, unit elongation: 3.5%, 20 DEG C of direct current resistances: 30.14n Ω .m, 20 DEG C of electric conductivity: 55.6%IACS through continuous drawing,
Be 9.52mm through continuously extruded one-tenth diameter, wall thickness is the aluminium-alloy pipe of 0.7mm, T4 state, tensile strength: 188Mpa, unit elongation: 14.5%.
This aluminum alloy materials is widely used in transportation, automobile air-conditioning pipe, domestic air conditioning pipe, refrigerator and refrigerator-freezer prolong, electric wire, communication signals line, electric power electric, communication signals shielding wire.
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 Aludur material, is characterized in that, the chemical composition of this material and weight percent are: rare earth elements RE 0.08 ~ 0.35%; The total amount 0.7 ~ 1.5%, Mg of Mg and Si and the mass ratio of Si are that 1.5 ~ 1.8:1, Cu:0 ~ 0.46%, Cr:0 ~ 0.4%, Cu and Cr gross weight is less than 0.75%, other single impurity≤0.05%, impurity summation≤0.15%, and surplus is aluminium; Wherein said rare earth element is selected from lanthanum, cerium, yttrium, praseodymium, neodymium, one or more the mixing in erbium.
2. rare earth Aludur material according to claim 1, it is characterized in that, described material also comprises the chemical composition of following weight percent: Cu:0.01 ~ 0.46%, Cr:0.02 ~ 0.4%, and Cu and Cr gross weight is less than 0.75%.
3. rare earth Aludur material according to claim 1 and 2, is characterized in that, described material chemical composition and weight percent are: RE:0.1 ~ 0.35%; Si:0.3 ~ 0.9%, Mg:0.3 ~ 0.9%, the wherein total amount 0.7 ~ 1.5% of Mg and Si; Or
RE:0.1 ~ 0.35%; Si:0.2 ~ 0.8%, Mg:0.35 ~ 1.2%, the wherein total amount 0.7 ~ 1.5% of Mg and Si.
4. a preparation method for rare earth Aludur 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 master alloy successively and magnesium ingot stirs, make aluminium alloy and control the chemical composition of this aluminium alloy and weight percent is: rare earth element 0.08 ~ 0.35%; The total amount 0.7 ~ 1.5%, Mg of Mg and Si and the mass ratio of Si are that 1.5 ~ 1.8:1, Cu:0 ~ 0.46%, Cr:0 ~ 0.4%, Cu and Cr gross weight is less than 0.75%, other single impurity≤0.05%, impurity summation≤0.15%, and 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, it is characterized in that, described step 2) master alloy be the combination of aluminum silicon alloy and rare earth alloy, or aluminum silicon alloy, aluminum-copper alloy, aluminum chromium and Al rare earth alloy combine, in wherein said aluminium alloy, the control of Cu and Cr weight percent is: Cu:0.1 ~ 0.46%, Cr:0.02 ~ 0.4%, Cu and Cr gross weight is less than 0.75%.
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 aluminum silicon alloy, Al rare earth alloy and magnesium ingot again 745 ~ 755 DEG C time; Or add aluminum silicon alloy, aluminum-copper alloy, aluminum chromium, Al rare earth alloy and magnesium ingot.
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 715 ~ 725 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 680 ~ 690 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 in the operation of rolling Al and Alalloy continuous casting and rolling emulsion and water on request proportioning carry out carrying out lubrication and cooling to rolling equipment and alloy pig, in the mixed solution of described emulsion and water, emulsion mass content is 10 ~ 12%, mixeding liquid temperature is 40 ~ 70 DEG C, and mixed solution flow is: 60 ~ 80m 3/ h.
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CN107419120B (en) * 2017-08-15 2019-04-05 合肥工业大学 A method of high-strength hypoeutectic Al-Si alloy is prepared using microalloying and fast solidification technology are compound
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CN108070755A (en) * 2017-12-29 2018-05-25 江西铃格有色金属加工有限公司 A kind of preparation method of the corrosion-resistant pack alloy containing samarium and yttrium
CN108048708A (en) * 2017-12-29 2018-05-18 南昌大学 A kind of preparation method of the anticorrosion aluminium material containing praseodymium and yttrium
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