CN111001778A - Method for efficiently preparing large-volume semi-solid slurry by composite process - Google Patents
Method for efficiently preparing large-volume semi-solid slurry by composite process Download PDFInfo
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- CN111001778A CN111001778A CN201911410939.4A CN201911410939A CN111001778A CN 111001778 A CN111001778 A CN 111001778A CN 201911410939 A CN201911410939 A CN 201911410939A CN 111001778 A CN111001778 A CN 111001778A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/007—Semi-solid pressure die casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/02—Use of electric or magnetic effects
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/08—Shaking, vibrating, or turning of moulds
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C18/00—Alloys based on zinc
- C22C18/04—Alloys based on zinc with aluminium as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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Abstract
The invention relates to a method for efficiently preparing large-volume semi-solid slurry by a composite process, which comprises the following steps: stirring the large-volume alloy melt in the container, applying melt disturbance to the outer wall of the container and adding particles of the same alloy component in the alloy melt so as to ensure that the alloy melt at the edge part is also disturbed sufficiently to avoid material sticking and ensure that the melt is cooled rapidly, and achieving the purposes of rapidly and uniformly distributing a melt component field and a temperature field and rapidly cooling. And under the treatment of the composite process, when the temperature of the melt is reduced to a preset semi-solid temperature, stopping the treatment to obtain large-volume semi-solid slurry with the solid phase rate of 20-60%, and conveying the slurry to forming equipment for rheoforming. The invention solves the problems of uneven tissue, sticking caused by insufficient stirring or disturbance at the edge of the crucible and slow cooling of the melt when the large-volume semi-solid slurry is prepared by a single process, has strong controllability and good industrialization prospect, and is particularly suitable for preparing the large-volume semi-solid slurry with the weight of more than 10 kg.
Description
Technical Field
The invention belongs to the technical field of metal semi-solid processing, and particularly relates to a method for efficiently preparing large-volume semi-solid slurry with the mass of more than 10kg by a composite process.
Background
In the 70 s of the 20 th century, professor M.C. Flemings of the national institute of technology and technology invented metal semi-solid processing technology. The preparation of the semi-solid slurry is the core and key of the semi-solid processing technology, and the preparation methods of the metal semi-solid slurry are various, such as a double-helix stirring method, a bubble stirring method, a serpentine runner method, a low superheat degree pouring and weak mechanical stirring method, an electromagnetic stirring method, a turbulence effect method, an ultrasonic treatment method, a forced convection stirring method, a jet deposition method, a cooling inclined groove method, a rotary enthalpy balance method and the like. However, the method has the problems of unstable process, difficulty in continuously and stably preparing the semi-solid slurry and unsuitability for preparing the large-volume semi-solid slurry. In order to realize the preparation of large-volume semi-solid slurry and realize stable, continuous and reliable industrial production, researchers, scholars and related industrial persons at home and abroad continuously strive and explore to develop a new pulping process to realize the efficient preparation of large-volume semi-solid slurry.
European patent EP 0745691A1 proposes a New Rheocasting (NRC) process, which comprises the following steps: pouring the alloy melt with low superheat degree into the inclined plate to form semi-solid slurry containing a large amount of primary solid phase in the flowing and cooling process of the inclined plate, controlling the cooling strength to enable the primary solid phase in the slurry to grow in a spherical mode after the slurry flows into the collection crucible, and then adjusting the temperature of the semi-solid slurry to obtain a temperature field which is as uniform as possible, so as to finally obtain the semi-solid slurry. In the NRC process, a composite process is not adopted to efficiently prepare the large-volume semi-solid slurry, namely, a melt stirring device, a melt disturbing device and the synergistic action of melting and heat absorption of alloy particles are not used to accelerate the cooling of the melt and promote the uniformity of a melt temperature field and a component field to quickly prepare the large-volume semi-solid slurry.
The document, "thin-wall aluminum alloy filter heat dissipation shell RSF semi-solid state die casting process simulation" (Zhang, Wangdong, Zhang, special casting and non-ferrous alloy, 2016) proposes a rapid preparation method of RSF slurry, namely, the semi-solid state slurry is rapidly prepared by controlling the enthalpy entropy of the melt to obtain a spherical crystal texture structure, but the method has the problems that the side slurry is stirred and disturbed little and is easy to stick to the inner wall of a crucible when pouring.
It should be noted that the above methods for preparing semi-solid alloy slurry have their own features, but all have their own disadvantages, and a new process suitable for preparing large-volume semi-solid slurry is still needed to be proposed, so as to improve the pulping efficiency, reduce the pulping cost, realize the high-efficiency preparation of large-volume semi-solid slurry, and further promote the industrialization and upgrade of semi-solid metal processing technology.
Disclosure of Invention
The invention aims to solve the problems that the existing pulping process is unstable, low in efficiency, not suitable for large-volume semi-solid slurry preparation, difficult to industrially popularize and the like, and provides a composite process for efficiently preparing large-volume semi-solid slurry, namely, in the solidification process of an alloy melt, directly stirring the alloy melt in a container and indirectly treating the melt near the crucible wall to generate disturbance, and simultaneously quickly scattering a certain amount of alloy particles into the alloy melt; under the synergistic action of melt stirring device, melt disturbance device and alloy particle melting and heat absorption, the alloy melt is rapidly cooled and largely nucleated in the alloy melt, and is dissociated in the melt under the convection action generated by stirring and disturbance, and simultaneously the synergistic action of stirring and disturbance makes the temperature field and the component field in the alloy uniform and inhibits the growth of crystal grain dendrites, thereby preparing the large-volume semi-solid slurry in which a certain volume fraction of spherical or near-spherical primary solid phase is uniformly distributed in a liquid phase matrix.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method for efficiently preparing large-volume semi-solid slurry by a composite process specifically comprises the following steps:
s1) placing the large-volume alloy melt with the temperature higher than the liquidus by 5-200 ℃ into a container;
s2) stirring the alloy melt in the container, and simultaneously uniformly scattering alloy particles into the alloy melt to rapidly cool the large-volume alloy melt;
s3), when the temperature of the large-volume alloy melt is rapidly reduced to the preset semi-solid slurry temperature, stopping stirring and adding alloy particles to obtain the large-volume semi-solid slurry with the solid fraction of 20-60%, and sending the semi-solid slurry to a forming device for rheoforming.
Further, the alloy melt in S1) includes aluminum alloy, magnesium alloy, steel, zinc alloy, titanium alloy, and composite materials thereof (composite materials of aluminum alloy, composite materials of magnesium alloy, composite materials of steel, composite materials of zinc alloy, and composite materials of titanium alloy).
Further, the stirring duration in the S2) is 5-40S; the stirring mode is as follows: the alloy melt at the center of the container wall is directly stirred, and the alloy melt near the container wall is indirectly stirred.
Further, the size of the alloy particles added in the step S2) is 0.1-100 mm, and the adding mass of the alloy particles is 0.2-30% of the mass of the alloy melt.
Furthermore, the alloy particles are particles with the same chemical composition as the alloy melt, or the alloy particles with the same composition as the melt are doped with a trace amount of a refiner or an alterant.
Further, the indirect stirring is disturbance stirring, and a device for disturbance stirring is arranged on the periphery of the outer side wall of the container.
Further, the disturbance stirring is ultrasonic stirring, electromagnetic stirring or mechanical vibration.
Further, the power of ultrasonic stirring is 200-3000W; the current of the electromagnetic stirring is 10-300A, and the frequency is 10-200 Hz; the mechanical vibration frequency is 10-1000 Hz.
Further, the direct stirring is mechanical stirring or ultrasonic stirring, wherein the rotating speed of the mechanical stirring is 50-1500 r/min; the power of ultrasonic stirring is 500-3000W.
A large-volume semi-solid slurry is prepared by the method.
The invention realizes the high-efficiency preparation of large-volume semi-solid slurry by a composite process, has stable and reliable working state, is an advanced preparation process of large-volume semi-solid slurry, and has the following advantages compared with the prior pulping process:
1. the invention provides a composite process for efficiently preparing large-volume semi-solid slurry, which has high pulping efficiency and stable and reliable pulping process, is particularly suitable for preparing large-volume semi-solid slurry and is easy to industrially popularize and apply.
2. The composite process can fully disturb the alloy melt, and avoid the phenomenon that the melt at the edge part is not stirred or disturbed to cause viscosity increase and is not easy to pour out from a container.
3. The composite process accelerates the cooling of the alloy melt and promotes the nucleation of the alloy melt, and simultaneously, due to the stirring and disturbance effects, the temperature field and the concentration field of the alloy melt can be more quickly uniform, so that the semi-solid slurry with fine primary solid phase, roundness and uniform distribution is obtained.
4. Alloy particles with the same components as the alloy melt are added, and trace refiner or modifier can be doped in the alloy particles, so that the alloy particles absorb a large amount of heat in the melting process, and the temperature of the alloy melt is quickly reduced.
Drawings
FIG. 1 is a schematic diagram of the composite process of the present invention for efficiently preparing large-volume semi-solid slurry.
FIG. 2 is a schematic diagram of the high-efficiency preparation of large-volume semi-solid slurry by the composite process of mechanical stirring, electromagnetic disturbance and alloy particle melting and heat absorption.
FIG. 3 is a schematic diagram of the high-efficiency preparation of large-volume semi-solid slurry by the ultrasonic stirring, electromagnetic disturbance and alloy particle melting heat absorption composite process of the present invention.
FIG. 4 is a schematic diagram of the high-efficiency preparation of large-volume semi-solid slurry by the composite process of mechanical stirring, mechanical vibration and alloy particle melting and heat absorption.
In the figure:
1. a container; 2. an alloy melt; 3. a direct stirring device; 4. a disturbance stirring device; 5. alloy particles; 6. a thermocouple; 7. a three-phase alternating current induction electromagnetic stirring coil; 8. a mechanical stirring rod; 9. an electromagnetic stirrer; 10. an ultrasonic agitator; 11. a vibrator.
Detailed Description
In order to make the technical scheme and advantages of the invention more clear, the following detailed description is made with reference to the accompanying drawings and specific embodiments.
The invention relates to a method for efficiently preparing large-volume semi-solid slurry by a composite process, which specifically comprises the following steps:
s1) placing the large-volume alloy melt with the temperature higher than the liquidus by 5-200 ℃ into a container;
s2) stirring the alloy melt in the container, and simultaneously uniformly scattering alloy particles into the alloy melt to rapidly cool the large-volume alloy melt;
s3), when the temperature of the large-volume alloy melt is rapidly reduced to the preset semi-solid slurry temperature, stopping stirring and adding alloy particles to obtain the large-volume semi-solid slurry with the solid fraction of 20-60%, and sending the semi-solid slurry to a forming device for rheoforming.
Further, the alloy melt in S1) includes aluminum alloy, magnesium alloy, steel, zinc alloy, titanium alloy, and composite materials thereof (composite materials of aluminum alloy, composite materials of magnesium alloy, composite materials of steel, composite materials of zinc alloy, and composite materials of titanium alloy).
Further, the stirring duration in the S2) is 5-40S; the stirring mode is as follows: the alloy melt at the center of the container wall is directly stirred, and the alloy melt near the container wall is indirectly stirred.
The size of the alloy particles added in the S2) is 0.1-100 mm, and the adding mass of the alloy particles is 0.2-30% of the mass of the alloy melt.
The alloy particles are particles with the same chemical composition as the alloy melt, or the alloy particles with the same composition as the melt are doped with a trace amount of refiner or modifier.
The indirect stirring is disturbance stirring, and a disturbance stirring device is arranged on the periphery of the outer side wall of the container.
The disturbance stirring is ultrasonic stirring, electromagnetic stirring or mechanical vibration.
The ultrasonic stirring power is 200-3000W; the current of the electromagnetic stirring is 10-300A, and the frequency is 10-200 Hz; the mechanical vibration frequency is 10-1000 Hz.
The direct stirring is mechanical stirring or ultrasonic stirring, wherein the rotating speed of the mechanical stirring is 50-1500 r/min; the power of ultrasonic stirring is 500-3000W.
A large-volume semi-solid slurry is prepared by the method.
As shown in fig. 1, the principle of the present invention is: during the solidification process of the alloy melt, the alloy melt 2 in the container 1 is stirred under the action of a direct stirring device 4 and a disturbance stirring device 5 arranged around the outer side wall of the container 1, and a certain amount of alloy particles are quickly scattered into the alloy melt during stirring; under the synergistic action of the direct stirring device 4, the disturbance stirring device 5 and the melting and heat absorption of alloy particles, a thermocouple 6 is arranged to detect the temperature change of the alloy melt 2, the alloy melt is rapidly cooled and is nucleated in a large amount in the alloy melt, and the alloy melt is dissociated in the melt under the convection action generated by stirring and disturbance, and the synergistic action of stirring and disturbance enables the temperature field and the component field in the alloy to be uniform, so that the growth of crystal grain dendrites is inhibited, and thus the large-volume semi-solid slurry of spherical or near-spherical primary solid phases with certain volume fractions uniformly distributed in a liquid phase matrix is prepared.
Example 1:
the schematic diagram of preparing large-volume semisolid slurry by the composite process is shown in figure 2, wherein the semisolid slurry of 40kg of A356 aluminum alloy (liquidus 615 ℃ and solidus 555 ℃) is prepared by the method.
The preparation work was as follows:
the container 1 is a crucible, and A356 aluminum alloy melt 2(40kg) with the temperature of 660 ℃ is scooped by the crucible;
the melt stirring device is a mechanical stirring device 8, the melt disturbing device is a three-phase alternating current induction electromagnetic stirring coil 7, the specific mechanical stirring parameters are that the outer diameter of a stirring rod is 80mm, the graphite material is adopted, the stirring speed is 600r/min, the specific electromagnetic disturbance parameters are 380V three-phase alternating current, the power is 2.2KW, and the current is 20A; starting a mechanical stirring 8 and a three-phase alternating current induction electromagnetic stirring coil 7 to respectively directly stir the alloy melt 2 and generate disturbance on the alloy melt near the crucible wall, and simultaneously quickly scattering A356 aluminum alloy particles 5 with the particle size of 5mm and the mass of 1kg into the alloy melt 2.
Under the synergistic effect of mechanical stirring, electromagnetic disturbance and heat absorption of alloy particle melting, rapidly cooling the A356 aluminum alloy melt 2 to a semi-solid temperature range;
and (1-4) when the temperature of the alloy melt is reduced to 600 ℃ which is the preset semi-solid temperature, stopping mechanical stirring and electromagnetic disturbance treatment, and pouring the prepared large-volume semi-solid slurry into a material cup of a die casting machine for rheologic die casting forming.
Example 2: the schematic diagram of preparing the large-volume semisolid slurry by the composite process is shown in figure 3, wherein the semisolid slurry of the AlSi8 aluminum alloy (liquidus 625 ℃ C., solidus 563 ℃ C.) with the mass of 62kg is prepared by the method. The method comprises the following steps:
(1-1) the vessel 1 was a crucible, and 50kg of the AlSi8 aluminum alloy melt 2 having a temperature of 670 ℃ was scooped up with a crucible and placed inside the melt disturbing apparatus 4.
(1-2) the adopted melt stirring device 3 is an ultrasonic stirrer 10, the number of the ultrasonic stirrers 10 is 3, the adopted melt disturbing device 4 is an electromagnetic stirrer 9, the number of the electromagnetic stirrers 9 is 4, the specific ultrasonic stirring parameter is ultrasonic power 1.5KW, the ultrasonic frequency is 20kHz, and the specific electromagnetic disturbing parameter is power 12KW and frequency 15 Hz; starting ultrasonic stirring and electromagnetic disturbance to directly stir the alloy melt 2 and generate disturbance to the melt near the crucible wall, and simultaneously quickly scattering AlSi8 aluminum alloy particles 5 with the particle size of 8mm and the mass of 1.5kg into the alloy melt 2, wherein the inside of the alloy particles 5 contains 0.01 wt.% of Al-Ti-B particle refiner with the particle size of 2 mm.
(1-3) rapidly cooling the AlSi8 aluminum alloy melt 2 to a semi-solid temperature range under the synergistic effect of ultrasonic stirring, electromagnetic disturbance and heat absorption of alloy particle melting;
(1-4) when the temperature of the alloy melt 2 is reduced to 590 ℃ of the preset semi-solid temperature, stopping ultrasonic stirring and electromagnetic disturbance treatment, and pouring the prepared large-volume semi-solid slurry into a material cup of a die casting machine for rheologic die casting forming.
Example 3: the schematic diagram of preparing large-volume semisolid slurry by adopting the composite process to prepare 95kg of ZnAl9Cu2 zinc alloy (liquidus 405 ℃ and solidus 345 ℃) semisolid slurry by adopting the method is shown in figure 4. The method comprises the following steps:
(1-1) the vessel 1 was a crucible, and 95kg of the ZnAl9Cu2 zinc alloy melt 2 having a temperature of 480 ℃ was scooped up with the crucible and placed inside the melt disturbing apparatus 4.
(1-2) mechanically stirring the melt by adopting a melt stirring device 3, wherein the number of mechanical stirring rods 8 is 3, the adopted melt disturbing device 4 is a vibrator 11, the specific mechanical stirring parameter is the stirring speed of 1000r/min, and the specific vibration parameter is the vibration frequency of 50 Hz; the mechanical stirring rod 8 and the vibrator 11 are started to respectively stir the zinc alloy melt 2 in the crucible 1 directly and the melt near the crucible wall indirectly so as to generate disturbance, and meanwhile, ZnAl9Cu2 zinc alloy particles 5 with the particle size of 10mm and the mass of 2.1kg are quickly scattered into the alloy melt 2.
(1-3) rapidly cooling the ZnAl9Cu2 zinc alloy melt 2 to a semi-solid temperature range under the synergistic action of mechanical stirring, vibrator disturbance and alloy particle melting heat absorption;
(1-4) when the alloy melt 2 is cooled to the preset semi-solid temperature of 382 ℃, stopping mechanical stirring and vibration disturbance treatment, and pouring the prepared large-volume semi-solid slurry into an extruder for rheologic extrusion molding.
The method for efficiently preparing the large-volume semi-solid slurry by the composite process provided by the embodiment of the application is described in detail above. The above description of the embodiments is only for the purpose of helping to understand the method of the present application and its core ideas; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.
As used in this specification and the appended claims, certain terms are used to refer to particular components, and various names may be used by a manufacturer of hardware to refer to a same component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect. The description which follows is a preferred embodiment of the present application, but is made for the purpose of illustrating the general principles of the application and not for the purpose of limiting the scope of the application. The protection scope of the present application shall be subject to the definitions of the appended claims.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the application as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.
Claims (10)
1. The method for efficiently preparing the large-volume semi-solid slurry by the composite process is characterized by comprising the following steps of:
s1) placing the large-volume alloy melt with the temperature higher than the liquidus by 5-200 ℃ into a container;
s2) compositely stirring the alloy melt in the container, and simultaneously uniformly scattering alloy particles into the alloy melt to rapidly cool the large-volume alloy melt;
s3), when the temperature of the large-volume alloy melt is rapidly reduced to the preset semi-solid slurry temperature, stopping stirring and adding alloy particles to obtain the large-volume semi-solid slurry with the solid fraction of 20-60%, and sending the semi-solid slurry to a forming device for rheoforming.
2. The method as claimed in claim 1, wherein the alloy melt in S1) comprises aluminum alloy, magnesium alloy, steel, zinc alloy, titanium alloy and composite material thereof.
3. The method as claimed in claim 1, wherein the stirring in S2) is continued for 5-40S; the stirring mode is as follows: the alloy melt at the center of the container is directly stirred, and the alloy melt near the container wall is indirectly stirred.
4. The method as claimed in claim 1, wherein the size of the alloy particles added in S2) is 0.1-100 mm, and the added mass of the alloy particles is 0.2-30% of the mass of the alloy melt.
5. The method according to claim 4, wherein the alloy particles are particles with the same chemical composition as the alloy melt, or alloy particles with the same composition as the melt are doped with a trace amount of refiner or modifier.
6. The method according to claim 3, wherein the indirect stirring in S2) is a turbulent stirring, and the means for turbulent stirring is disposed around the outer sidewall of the vessel.
7. The method of claim 6, wherein the turbulent agitation is ultrasonic agitation, electromagnetic agitation, or mechanical vibration.
8. The method according to claim 7, wherein the power of the ultrasonic agitation is 200-3000W; the current of the electromagnetic stirring is 10-300A, and the frequency is 10-200 Hz; the mechanical vibration frequency is 10-1000 Hz.
9. The method according to claim 3, wherein the direct stirring in S2) is mechanical stirring or ultrasonic stirring, wherein the rotation speed of the mechanical stirring is 50-1500 r/min; the power of ultrasonic stirring is 500-3000W.
10. A large volume semi-solid slurry, characterized in that it is prepared by a method according to any one of claims 1 to 9.
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Cited By (3)
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| CN112404402A (en) * | 2020-11-19 | 2021-02-26 | 韦登发 | Casting process of pore-free aluminum alloy |
| CN113084123A (en) * | 2021-04-06 | 2021-07-09 | 将乐瑞沃康普机械设备有限公司 | Semi-solid die-casting forming process for aluminum alloy automobile parts |
| CN114939633A (en) * | 2022-04-13 | 2022-08-26 | 北京科技大学 | System and process for preparing and forming non-oxidation high-purity large-volume semi-solid slurry |
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