CN100543165C - Vacuum stirring composite granule reinforcing aluminium-based composite material and preparation technology thereof - Google Patents

Vacuum stirring composite granule reinforcing aluminium-based composite material and preparation technology thereof Download PDF

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CN100543165C
CN100543165C CNB2007101902506A CN200710190250A CN100543165C CN 100543165 C CN100543165 C CN 100543165C CN B2007101902506 A CNB2007101902506 A CN B2007101902506A CN 200710190250 A CN200710190250 A CN 200710190250A CN 100543165 C CN100543165 C CN 100543165C
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CN101158001A (en
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毛建伟
刘俊东
孙敏
张建平
曹新乐
乐永康
刘彬
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Suzhou Non-ferrous Metal academy Co., Ltd.
Aluminum Corp of China Ltd
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SUZHOU NON-FERROUS METAL ACADEMY Co Ltd
Aluminum Corp of China Ltd
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Abstract

The present invention relates to vacuum stirring composite granule reinforcing aluminium-based composite material and preparation technology, composition: Si 0~15wt%, Mg 0~1.5wt%, Cu 0~2.0wt%, Mn 0~1.0wt%, Cr 0~0.4wt%, Ti 0~0.2wt%, SiC 0.1~20% (volume ratio).With the matrix alloy melting, slag hitting, refining are stirred at a slow speed under vacuum condition and are finished matrix melt degassing procedure, will continue to add in the aluminum substrate melt through pretreated enhanced granule earlier, and mechanical stirring is involved in particle in the melt; After treating that particle joins melt fully, carry out that brute force stirs and the slow reverse stirring is dispersed in the matrix uniform particles; Heat up, with alterant and fining agent; Lay down vacuum, leave standstill, take dross on surface of fusant off, cast.Stir to realize evenly compound between particle and the matrix by vacuum machine, the interface combines well between particle and the matrix, and enhanced granule is distribution uniform in matrix, and the matrix material porosity of preparation is low, is easy to realize industrial scale production.

Description

Vacuum stirring composite granule reinforcing aluminium-based composite material and preparation technology thereof
Technical field
The present invention relates to vacuum stirring composite granule reinforcing aluminium-based composite material and preparation technology thereof, belong to technical field of composite materials.
Background technology
The development of high-and-new science and technology and application are promoting material to many-sided development such as high specific strength, high specific stiffness, height ratio toughness, high temperature resistant, antifatigues.Particle enhanced aluminum-based composite material has the synergy that its starting material of performance are formed, collect high ratio modulus, high specific strength, controlled thermal expansivity especially, and advantage such as good high-temperature performance, the characteristics that have very big material design freedom simultaneously, be to study one of maximum, most widely used material in the matrix material, become the important research direction of contemporary advanced composite material.
Compare with matrix alloy, particle enhanced aluminum-based composite material not only has high specific strength, high specific stiffness, wear-resistant, excellent properties such as thermal expansivity is little, dimensional stabilizing, but but also have the performance design feature, therefore many countries quantity research funds that had high input carry out the research and the application and development of this type of material.The main preparation technology of particle enhanced aluminum-based composite material is powder metallurgy, composite casting, jet deposition, stirring casting method at present.First three plant technological method because have complex process, facility investment is big, cost is high, be difficult to shortcoming such as manufacturing structure complicated shape, therefore is not suitable for continuous production in enormous quantities, application prospect is subjected to certain restriction.And the mechanical mixing method equipment requirements is low, technology is simple, cost is low, is fit to the industrialization continuous production, and therefore, the mechanical stirring casting will be the most promising and effectively be used for the manufacture method that particle enhanced aluminum-based composite material is produced in extensive chemical industry.
With regard to essence, stirring casting is meant reinforces such as treated particle is joined the matrix metal melt, make in the diffusion of its strong movements by certain mechanical system high-speed stirring reinforced particulate and to be evenly distributed in the matrix composite granule reinforcing aluminium-based composite material.Though can prepare particulate reinforced composite with liquid paddling process, still have some problems to take measures: 1. the wettability of particle and matrix is bad, and particle is difficult to combine firmly with matrix under the high temperature; 2. the aluminium liquid oxidation is serious in high temperature violent stirring process, can be involved in a lot of gases in the liquid, causes gas to be difficult to discharge.The method of improving enhanced granule and matrix wettability mainly contains plating, metallizing or carries out technologies such as surface cleaning, but these method complex process are difficult to adapt to needs of scale production; Can make enhanced granule uniform distribution in matrix by melt being carried out suitable speed stirring, if stirring velocity is crossed low or too high, then can occur stirring compound not thorough, on perhaps particle easily gathers around the crucible partially under action of centrifugal force and influence whole complex intensifying effect, gas, oxide compound and scum silica frost etc. also are involved in casting flaw such as form pore in the melt, be mingled with easily.
At the mid-80 in last century, U.S. Dural aluminum composite company has carried out great innovation and improvement to stirring technique, finish particulate in a vacuum and stir adding, casting, solved above-mentioned said casting flaw well, make the particle enhanced aluminum-based composite material of excellent performance.Find that by literature search Chinese patent publication number CN1676237A discloses a kind of vacuum mechanical dual-stirring casting method for preparing particle enhanced aluminum-based composite material, this preparation method joins bath surface with enhanced granule under antivacuum, vacuumize then, stirs, the degassing, the cast ingot casting.The deficiency that exists is that particle can not prevent that in the high-temperature roasting preprocessing process particulate unity from becoming piece, and the disposable bath surface that joins of enhanced granule stirs recombination process and is difficult to control, difficulties in dispersion, and particle easily splashes and sticks on the sidewall of crucible; Carry out particulate under antivacuum and add, secondary pollution has taken place in particle, causes in the follow-up stirring recombination process particulate uniformly dispersed poor, is difficult to apply in large-scale production.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of vacuum stirring composite granule reinforcing aluminium-based composite material and preparation technology thereof are provided, are intended to solve to stir in the recombination process particle and problems such as the matrix wettability is poor, skewness and void content height.
Purpose of the present invention is achieved through the following technical solutions:
Vacuum stirring composite granule reinforcing aluminium-based composite material, its characteristics are that the content of composition is: Si 0~25Wt% (mass ratio), Mg 0~1.5Wt% (mass ratio), Cu 0~2.0Wt% (mass ratio), Mn 0~1.0Wt% (mass ratio), Cr 0~0.4Wt% (mass ratio), Ti 0~0.2Wt% (mass ratio), SiC 0.1~20% (volume ratio), surplus is Al.
Further, the preparation technology of vacuum stirring composite granule reinforcing aluminium-based composite material, be characterized in: the matrix alloy melting, vacuumize, add the SiC enhanced granule, and vacuum stirring in addition, make that particle is compound to be entered and be dispersed in the matrix melt, heat up, add alterant, fining agent, lay down vacuum, cast; Specifically may further comprise the steps---
1. press mass ratio weighing enhanced granule and aluminum metal melt, master alloy;
2. enhanced granule is sieved, remove particle and other impurity of reunion, when the aluminum metal material is dropped into smelting furnace, particle is put into the pre-treatment stove that has whipping appts and carry out high-temperature roasting, start simultaneously that agitator stirs in order to avoid particle roasting and luming, roasting time 3~5h is to remove the moisture and the impurity of particle surface absorption;
3. after aluminium ingot dissolved and finishes, one or several in input industrial crystallization silicon, Al-Cu, Al-Mn, Al-Cr, Al-Ti, the pure magnesium carried out the composition adjustment; Carry out slag hitting, refining after alloy melts fully, vacuumize, start agitator and carry out the melt stirring, adjust rotating speed 200~500r/min, to remove the gas that adsorbs in the matrix melt;
4. temperature of aluminum liquid is controlled at 550~700 ℃, by the reinforced passage of particle enhanced granule is progressively delivered to bath surface, and enhanced granule enters melt under the reactive force that the spiral that stirring causes produces afterwards; Constantly add with particulate, stirring velocity improves constantly, and is as the criterion so that melt does not splash and forms stable spiral, make particle be involved in melt fast, finish the adition process of enhanced granule, the speed that particle adds is at 0.3~3kg/min, and the joining day is controlled at 5~15min;
5. after treating that particle joins melt entirely, increase stirring velocity, in this process, keep liquid level steady, carrying out brute force stirs, speed is 1000~2000r/min, and churning time 20~30min does not reunite particle, be dispersed in the melt, finish the recombination process of enhanced granule and matrix melt;
6. after finishing particle and matrix melt even compound, carry out melt and heat up, in temperature-rise period, continue to stir, and underspeed gradually, keep liquid level steady, when being warmed up to 700~720 ℃, oppositely stir 3~10min, adjust stirring velocity according to the steady situation of bath surface, promote so that the melt of bottom stirs come-up that particle is disorderly more and be evenly dispersed in the melt, and the gas that entrains in the melt is overflowed under vacuum action, melt continues to heat up;
When body temperature degree 7. fusion is warmed up to 730~750 ℃, stop vacuum stripping, alterant and fining agent are joined bath surface by the material alloying device, under 200~400r/min rotating speed, stir 3~5min, impel alterant and fining agent to fuse into fast and be dispersed in the melt; Afterwards, agitator is promoted to upper of furnace body with the speed of 100~150r/min, lays down vacuum, leaves standstill, and takes dross on surface of fusant off, comes out of the stove, and is cast in to become ingot casting in the ingot mould.
Further, the preparation technology of above-mentioned vacuum stirring composite granule reinforcing aluminium-based composite material, step 1. in, described enhanced granule is green α-SiC, granularity is 10~50 μ m.
Further, the preparation technology of above-mentioned vacuum stirring composite granule reinforcing aluminium-based composite material, step 2. in, the pretreated temperature of particle roasting is 300~800 ℃, the particulate stirring velocity is 100~500r/min.
Again further, the preparation technology of above-mentioned vacuum stirring composite granule reinforcing aluminium-based composite material, step 3. in, the vacuum tightness that vacuumizes is 0.5 * 10 -2~2.0 * 10 -2MPa.
Again further, the preparation technology of above-mentioned vacuum stirring composite granule reinforcing aluminium-based composite material, step 7. in, described alterant is the ZS-AB type, described fining agent is the ZS-AX type.
Again further, the preparation technology of above-mentioned vacuum stirring composite granule reinforcing aluminium-based composite material, step 7. in, the melt refining temperature is 730~760 ℃ of scopes, refining time 3~5min; The melt dwell temperature is 700~760 ℃ of scopes, and time of repose is 10~30min.
Substantive distinguishing features and obvious improvement that technical solution of the present invention is outstanding are mainly reflected in:
1. the equipment of the present invention's employing is simple, realized evenly compound between particle and the matrix by the vacuum machine stirring technique, solved the wetting relation between particle and the matrix, the two interface is in conjunction with good, enhanced granule is distribution uniform in matrix, do not have obvious agglomeration, the matrix material porosity of preparation is low;
2. the pretreatment technology process of enhanced granule is simple, easy to operate, and particle, moisture and other impurity of unity is removed in high-temperature roasting; Be aided with mechanical stirring device again, prevent that particulate unity becomes piece in the roasting process, promote the stirring composite effect between follow-up particle and the matrix effectively, improve particle distributing homogeneity in matrix; Before adding enhanced granule, melt vacuumizes the melt of agitator stirring simultaneously, helps removing the gas in the melt;
3. particle adds under the vacuum condition identical with the matrix melt in the melt, and particulate cleaning after the assurance pre-treatment reduces the enhanced granule secondary pollution, has reduced operation sequence simultaneously, increases work efficiency; Particulate adds continuously, improves composite effect greatly, splashes when avoiding disposable adding particle or sticks on the sidewall of crucible;
4. positive and negative two-way stirring increases the particulate actual recovery rate greatly, increases the uniform particles degree of scatter, improves melt degasification refining effect; And, because low temperature adopts down stirring at low speed, effectively reduce high-temperature fusant and enhanced granule to the washing away and corrosive nature of agitator, reduce the foreign matter content in the melt, improve the work-ing life of agitator;
5. it is simple that the present invention makes Industrial processes control, and production cost is low, is easy to realize industrial scale production.
Description of drawings
Below in conjunction with accompanying drawing technical solution of the present invention is described further:
Fig. 1: the structural representation of the device of preparation particle enhanced aluminum-based composite material;
The metallographic structure figure of the SiC particle enhanced aluminum-based composite material of Fig. 2: embodiment 1 preparation;
The metallographic structure figure of the SiC particle enhanced aluminum-based composite material of Fig. 3: embodiment 2 preparations;
The metallographic structure figure of the SiC particle enhanced aluminum-based composite material of Fig. 4: embodiment 3 preparations.
The implication of Reference numeral sees the following form:
Reference numeral Implication Reference numeral Implication Reference numeral Implication
1 The pretreatment of particles stove 2 Agitator 3 Temperature measuring mechanism
4 Inclining rotary mechanism 5 Vacuum resistance furnace 6 The material alloying mouth
Reference numeral Implication Reference numeral Implication Reference numeral Implication
7 The particle transport passage 8 Vacuum system
Embodiment
As Fig. 1, the device of preparation particle enhanced aluminum-based composite material, comprise vacuum resistance furnace 5, agitator 2, pretreatment of particles stove 1, particle transport passage 7 and pumped vacuum systems 8, aluminium alloy smelting is fixed on the inclining rotary mechanism 4 with vacuum resistance furnace 5, and bell is provided with material alloying mouth 6, temperature measuring mechanism 3.
Embodiment 1
Get the raw materials ready: with α-SiC is enhanced granule, and aluminium strontium and aluminium rare earth are as alterant.Weight ratio by SiC and aluminium alloy is 1:4.5 SiC and the 5.5kg aluminium alloy of weighing 1.2kg respectively, and aluminium alloy is ZL108, and the granularity of SiC is W14.With aluminium strontium, aluminium rare earth and aluminium alloy weight ratio is aluminium strontium, the 27.5 aluminium rare earths of 0.1:20 weighing 27.5g.
1.2kgSiC is sieved, remove cluster of grains and other impurity of unity, when aluminum matrix alloy drops into crucible the SiC particle put into and carry out the roasting pre-treatment in the pre-treatment stove 1, temperature is set in 600 ℃, with the impurity of removing particle surface and the pollutents such as moisture of absorption.
Stir compound: matrix ZL108 aluminium alloy is dropped in the vacuum resistance furnace 5 melt, temperature is set in 730 ℃.Alloy carries out slag hitting, refining after melting end fully.After matrix alloy melting, the refining, vacuumize, vacuum tightness is 0.01MPa, starts agitator simultaneously and carries out the melt stirring, adjusts rotating speed 200~500r/min, to remove the gas that adsorbs in the matrix melt.
Temperature of aluminum liquid is controlled at 550 ℃, by transfer passage 7 enhanced granule progressively is transported to bath surface with the speed of 0.3kg/min, and enhanced granule enters melt under the reactive force that the spiral that stirring causes produces; Constantly add with particulate, stirring velocity improves constantly, so that melt does not produce and splashes and stable spiral is as the criterion, makes particle be involved in melt fast, finishes the adition process of enhanced granule.
After treating that enhanced granule joins melt fully, continue to increase stirring velocity and carry out the powerful stirring of high speed, keep liquid level steady in the increase process, stirring velocity is 1200r/min, churning time 20min strengthens the SiC that reunites efficiently and smashes, and does not reunite, be dispersed in the melt, finish the even recombination process of enhanced granule and matrix melt.
After finishing particle and matrix melt even compound, carry out melt and heat up; Continue to stir in temperature-rise period, stirring velocity is 700r/min.When being warmed up to 700~720 ℃, oppositely stir, suitably adjust stirring velocity according to the steady situation of bath surface, promote so that the melt of bottom stirs come-up that particle is disorderly more and be evenly dispersed in the melt, and the gas that entrains in the melt is overflowed under vacuum action.
When body temperature degree fusion is warmed up to 730~750 ℃, stop vacuum stripping, ZS-AB type alterant and ZS-AX type fining agent are joined bath surface by material alloying mouth 6, stir among 3~5min under the 350r/min rotating speed, promotion alterant and fining agent fuse into fast and are dispersed in the melt.At last, agitator slowly is promoted to upper of furnace body with 100~150r/min speed, lays down vacuum, melt leaves standstill 10~30min at 700~760 ℃, takes dross on surface of fusant off, is cast in to become ingot casting in the ingot mould.
The SiC particle of pressing the above-mentioned steps preparation strengthens the metallographic structure of SiCp/ZL108 aluminum matrix composite, and as shown in Figure 2, tissue shows that enhanced granule SiC dispersion is more even, does not have obvious agglomeration, and pore is mingled with few.
Embodiment 2
Get the raw materials ready: with α-SiC is enhanced granule, and aluminium strontium and aluminium rare earth are as alterant.Weight ratio by SiC and aluminium alloy is 1:16 weighing 0.343kgSiC and a 5.5kg aluminium alloy respectively, and aluminium alloy is 6061, and the granularity of SiC is W14.
0.343kgSiC is sieved, remove cluster of grains and other impurity of unity, when aluminum matrix alloy drops into crucible the SiC particle put into and carry out the roasting pre-treatment in the pre-treatment stove 1, temperature is set in 300 ℃, with the impurity of removing particle surface and the pollutents such as moisture of absorption.
Stir compound: matrix 6061 aluminium alloys are dropped in the vacuum resistance furnace 5 melt, temperature is set in 730 ℃.Alloy carries out slag hitting, refining after melting end fully.After matrix alloy melting, the refining, vacuumize, vacuum tightness is 0.005MPa, starts agitator simultaneously and carries out the melt stirring, adjusts rotating speed 200~500r/min, to remove the gas that adsorbs in the matrix melt.
Temperature of aluminum liquid is controlled at 690 ℃, by transfer passage 7 enhanced granule progressively is transported to bath surface with the speed of 3kg/min, and enhanced granule enters melt under the reactive force that the spiral that stirring causes produces; Constantly add with particulate, stirring velocity improves constantly, so that melt does not produce and splashes and stable spiral is as the criterion, makes particle be involved in melt fast, finishes the adition process of enhanced granule.
After treating that enhanced granule joins melt fully, continue to increase stirring velocity and carry out the powerful stirring of high speed, keep liquid level steady in the increase process, stirring velocity is 2000r/min, churning time 20min strengthens the SiC that reunites efficiently and smashes, and does not reunite, be dispersed in the melt, finish the even recombination process of enhanced granule and matrix melt.
After finishing particle and matrix melt even compound, carry out melt and heat up; Continue to stir in temperature-rise period, stirring velocity is 720r/min.When being warmed up to 700~720 ℃, oppositely stir, suitably adjust stirring velocity according to the steady situation of bath surface, promote so that the melt of bottom stirs come-up that particle is disorderly more and be evenly dispersed in the melt, and the gas that entrains in the melt is overflowed under vacuum action.
When body temperature degree fusion is warmed up to 730~750 ℃, stop vacuum stripping, last, agitator slowly is promoted to upper of furnace body with 100~150r/min speed, lays down vacuum, melt leaves standstill 10~30min at 700~760 ℃, take dross on surface of fusant off, be cast in one-tenth ingot casting in the ingot mould.
The SiC particle of pressing the above-mentioned steps preparation strengthens the metallographic structure of SiCp/6061 aluminum matrix composite, and as shown in Figure 3, tissue shows that enhanced granule SiC dispersion is more even, does not have obvious agglomeration, and pore is mingled with few.
Embodiment 3
Get the raw materials ready: with α-SiC is enhanced granule, and aluminium strontium and aluminium rare earth are as alterant.Weight ratio by SiC and aluminium alloy is 1:3.4 SiC and the 7.1kg aluminium alloy of weighing 2.07kg respectively, and aluminium alloy is A356, and the granularity of SiC is W14.With aluminium strontium, aluminium rare earth and aluminium alloy weight ratio is aluminium strontium and the 32g aluminium rare earth of 0.1:22 weighing 32g.
2.07kgSiC is sieved, remove cluster of grains and other impurity of unity, when aluminum matrix alloy drops into crucible the SiC particle put into and carry out the roasting pre-treatment in the pre-treatment stove 1, temperature is set in 800 ℃, with the impurity of removing particle surface and the pollutents such as moisture of absorption.
Stir compound: matrix A356 aluminium alloy is dropped in the vacuum resistance furnace 5 melt, temperature is set in 730 ℃.Alloy carries out slag hitting, refining after melting end fully.After matrix alloy melting, the refining, vacuumize, vacuum tightness is 0.02MPa, starts agitator simultaneously and carries out the melt stirring, adjusts rotating speed 200~500r/min, to remove the gas that adsorbs in the matrix melt.
Temperature of aluminum liquid is controlled at 700 ℃, by transfer passage 7 enhanced granule progressively is transported to bath surface with the speed of 1.5kg/min, and enhanced granule enters melt under the reactive force that the spiral that stirring causes produces; Constantly add with particulate, stirring velocity improves constantly, so that melt does not produce and splashes and stable spiral is as the criterion, makes particle be involved in melt fast, finishes the adition process of enhanced granule.
After treating that enhanced granule joins melt fully, continue to increase stirring velocity and carry out the powerful stirring of high speed, keep liquid level steady in the increase process, stirring velocity is 2000r/min, churning time 20min strengthens the SiC that reunites efficiently and smashes, and does not reunite, be dispersed in the melt, finish the even recombination process of enhanced granule and matrix melt.
After finishing particle and matrix melt even compound, carry out melt and heat up; Continue to stir in temperature-rise period, stirring velocity is 710r/min.When being warmed up to 700~720 ℃, oppositely stir, suitably adjust stirring velocity according to the steady situation of bath surface, promote so that the melt of bottom stirs come-up that particle is disorderly more and be evenly dispersed in the melt, and the gas that entrains in the melt is overflowed under vacuum action.
When body temperature degree fusion is warmed up to 730~750 ℃, stop vacuum stripping, ZS-AB type alterant and ZS-AX type fining agent are joined bath surface by material alloying mouth 6, under the 400r/min rotating speed, stir among 3~5min, promote alterant or fining agent to enter and be dispersed in the melt.At last, agitator slowly is promoted to upper of furnace body with 100~150r/min speed, lays down vacuum, melt is at 730~760 ℃ of refining time 3~5min; Melt leaves standstill 10~30min at 700~760 ℃, takes dross on surface of fusant off, is cast in to become ingot casting in the ingot mould.The material structure of preparation as shown in Figure 4, it is more even that enhanced granule SiC disperses, and do not have obvious agglomeration, pore is mingled with few.
Below only be concrete exemplary applications of the present invention, protection scope of the present invention is not constituted any limitation.All employing equivalents or equivalence are replaced and the technical scheme of formation, all drop within the rights protection scope of the present invention.

Claims (5)

1. the preparation technology of vacuum stirring composite granule reinforcing aluminium-based composite material, it is characterized in that: the matrix alloy melting, vacuumize, add the SiC enhanced granule, and vacuum stirring in addition, make that particle is compound to be entered and be dispersed in the matrix melt, heat up, add alterant, fining agent, lay down vacuum, cast; Specifically may further comprise the steps---
1. press mass ratio weighing enhanced granule and aluminium ingot, master alloy;
2. enhanced granule is sieved, remove particle and other impurity of reunion, when aluminium ingot is dropped into smelting furnace, particle is put into the pre-treatment stove that has whipping appts and carry out high-temperature roasting, start simultaneously that agitator stirs in order to avoid particle roasting and luming, roasting time 3~5h is to remove the moisture and the impurity of particle surface absorption;
3. after aluminium ingot dissolved and finishes, one or more in input industrial crystallization silicon, Al-Cu, Al-Mn, Al-Cr, Al-Ti, the pure magnesium carried out the composition adjustment; Carry out slag hitting, refining after alloy melts fully, vacuumize, start agitator and carry out the melt stirring, adjust rotating speed 200~500r/min, to remove the gas that adsorbs in the matrix melt;
4. temperature of aluminum liquid is controlled at 550~700 ℃, by the reinforced passage of particle enhanced granule is progressively delivered to bath surface, and enhanced granule enters melt under the reactive force that the spiral that stirring causes produces afterwards; Constantly add with particulate, stirring velocity improves constantly, and is as the criterion so that melt does not splash and forms stable spiral, make particle be involved in melt fast, finish the adition process of enhanced granule, the speed that particle adds is at 0.3~3kg/min, and the joining day is controlled at 5~15min;
5. after treating that particle joins melt entirely, increase stirring velocity, in this process, keep liquid level steady, carrying out brute force stirs, speed is 1000~2000r/min, and churning time 20~30min does not reunite particle, be dispersed in the melt, finish the recombination process of enhanced granule and matrix melt;
6. after finishing particle and matrix melt even compound, carry out melt and heat up, in temperature-rise period, continue to stir, and underspeed gradually, keep liquid level steady, when being warmed up to 700~720 ℃, oppositely stir 3~10min, adjust stirring velocity according to the steady situation of bath surface, promote so that the melt of bottom stirs come-up that particle is disorderly more and be evenly dispersed in the melt, and the gas that entrains in the melt is overflowed under vacuum action, melt continues to heat up;
When body temperature degree 7. fusion is warmed up to 730~750 ℃, stop vacuum stripping, alterant and fining agent are joined bath surface by the material alloying device, under 200~400r/min rotating speed, stir 3~5min, impel alterant and fining agent to fuse into fast and be dispersed in the melt; Afterwards, agitator is promoted to upper of furnace body with the speed of 100~150r/min, lays down vacuum, leaves standstill, and takes dross on surface of fusant off, comes out of the stove, and is cast in to become ingot casting in the ingot mould.
2. the preparation technology of vacuum stirring composite granule reinforcing aluminium-based composite material according to claim 1 is characterized in that: step 1. in, described enhanced granule is green α-SiC, granularity is 10~50 μ m.
3. the preparation technology of vacuum stirring composite granule reinforcing aluminium-based composite material according to claim 1 is characterized in that: step 2. in, the pretreated temperature of particle roasting is 300~800 ℃, the particulate stirring velocity is 100~500r/min.
4. the preparation technology of vacuum stirring composite granule reinforcing aluminium-based composite material according to claim 1 is characterized in that: step 3. in, the vacuum tightness that vacuumizes is 0.5 * 10 -2~2.0 * 10 -2MPa.
5. the preparation technology of vacuum stirring composite granule reinforcing aluminium-based composite material according to claim 1 is characterized in that: step 7. in, described alterant is the ZS-AB type, described fining agent is the ZS-AX type.
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