CN114131021A - Metal injection molding method of Al-Si-Mg series aluminum alloy - Google Patents
Metal injection molding method of Al-Si-Mg series aluminum alloy Download PDFInfo
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Abstract
The invention discloses a metal injection molding method of Al-Si-Mg series aluminum alloy. Firstly, weighing aluminum alloy powder raw materials according to a design formula according to a stoichiometric ratio, carrying out pretreatment, then mixing and granulating the aluminum alloy powder raw materials and a binder to obtain uniform feed, injecting the feed into a die cavity by using an injection molding technology to obtain a product green body, then carrying out first thermal degreasing and hot isostatic pressing molding treatment on the green body, and finally sequentially finishing second thermal degreasing, sintering densification and solution aging heat treatment to obtain an aluminum alloy product. Compared with the prior art, the aluminum alloy part with excellent performance is prepared by adopting the technical means of powder pretreatment, green blank hot isostatic pressing and the like on the basis of the metal injection molding technology, and has the advantages of good mechanical property, high density, high production efficiency, easiness in realization of batch production and the like, the tensile strength of the obtained aluminum alloy product is more than or equal to 240MPa, the elongation is more than or equal to 1.5 percent, the density is more than or equal to 95 percent, the aluminum alloy product can be comparable to a cast aluminum alloy product, and the requirements of customers can be well met.
Description
Technical Field
The invention relates to a preparation method of an aluminum alloy, in particular to a metal injection molding method of an Al-Si-Mg series aluminum alloy.
Background
Aluminum is the most abundant element in the earth's crust, second only to oxygen and silicon, and has a relative density of only 2.7g/cm-3The coating has high ductility, high electrical conductivity and thermal conductivity, and can react with oxygen in the air to form a layer of corrosion-resistant oxide film to form a good protection effect. Nowadays, the demand for lightweight products is increasing, and aluminum alloys having lower density and high specific strength after alloying are used as preferred metals for lightweight solutions, and have been used in a large number in the manufacturing industries of airplanes, automobiles, trains, ships, and the like.
The Al-Si-Mg alloy has excellent corrosion resistance, fatigue resistance and castability, and can obtain dispersed Mg after heat treatment due to the existence of Mg element2The Si phase plays a role in strengthening, so the series aluminum alloy also has higher specific strength and better comprehensive mechanical property, and is a mature lightweight material.
The aluminum has strong oxygen affinity, particularly the powder, when the aluminum powder is exposed in the air, nano-scale Al can be formed on the surface quickly2O3The film has strong isolation effect and can isolate the matrix from the outside, so the aluminum alloy often has strong corrosion resistance and oxidation resistance. However, the existence of the surface oxide film also brings difficulty to the preparation, and raw materials can effectively contact with each other after the oxide film is removed to form metallurgical bonding. At present, the technological methods for solving the problem mainly comprise casting forming, warm pressing forming, high-speed pressing, powder forging and the like.In addition to the cast molding, none of these methods except that the powder is effectively contacted by applying a large pressure to deform the powder and physically break the oxide film. Metal Injection Molding (MIM) cannot provide metallurgical effects during casting and pressure required to break oxide films during molding, so that it is difficult to prepare an aluminum alloy using the MIM method. In addition to this problem, the patent "a method for preparing high performance aluminum alloy by using powder injection molding technique" (CN107790729B) has two difficulties: firstly, because the organic binder in the injection molding blank is high in occupation ratio, the porosity of the interior of the degreased blank is much larger than that of a pressed blank; secondly, the aluminum powder has the characteristic of moisture absorption, and can react with oxygen radicals and water vapor to further increase the thickness of an oxide film on the surface of the powder, and powder agglomeration can be caused, so that the feeding components are uneven. Therefore, the MIM technology is difficult to apply to aluminum alloy production, the achievement on the aspect is low at present, but compared with the traditional casting and powder metallurgy technology, the MIM technology has great advantages in the preparation of high-performance complex structural parts, and the prepared parts are uniform in structure, high in density, high in shape precision and good in surface smoothness, are near-net forming technologies, and are high in efficiency and low in cost during mass production.
Disclosure of Invention
In order to solve the problems in the prior art, an Al-Si-Mg series aluminum alloy injection molding method is provided, and on the basis of the MIM technology, technical means such as powder pretreatment, green blank hot isostatic pressing and the like are introduced to prepare an aluminum alloy product with excellent performance and stable quality, so that the application of the MIM aluminum alloy in the fields of aerospace, automobile industry, electronic information and the like is further promoted.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention relates to a metal injection molding method of Al-Si-Mg series aluminum alloy, which comprises the following specific preparation steps: firstly, weighing aluminum alloy powder raw materials according to a design formula according to a stoichiometric ratio, carrying out pretreatment, then mixing and granulating the aluminum alloy powder raw materials and a binder to obtain uniform feed, injecting the feed into a die cavity by using an injection molding technology to obtain a product green body, then carrying out first thermal degreasing and hot isostatic pressing molding treatment on the green body, and finally sequentially finishing second thermal degreasing, sintering densification and solution aging heat treatment to obtain an aluminum alloy product.
The pretreatment comprises the following steps: drying and dispersing, namely placing the aluminum alloy powder raw material in a vacuum drying box, placing a drying agent in the drying box, preserving the heat for 10-12 hours at the temperature of 80-90 ℃, and dispersing the powder by using an ultrasonic vibration screen after cooling;
the drying agent is one of calcium chloride, silica gel or molecular sieve drying agent;
the hot isostatic pressing forming process comprises the following steps: the forming temperature is 130-150 ℃, the forming pressure is 110-140 MPa, and the sheath material is rubber or plastic.
Preferably, the aluminum alloy product comprises the following components in percentage by mass: si: 6.5-8.5%, Mg: 2-4% and the balance of Al.
In a preferred scheme, the aluminum alloy powder comprises the following raw materials: ZL101 prealloying powder (the main elements are Al, Si and Mg), Al-12Si alloy powder, Al-50Mg alloy powder and Al powder; the grain size of the ZL101 prealloying powder is less than or equal to 18 mu m, and the purity is more than or equal to 99.9%; the granularity of the Al-12Si powder is less than or equal to 25 mu m, and the purity is more than or equal to 99.0 percent; the granularity of Al-50Mg is less than or equal to 25 mu m, the purity is more than or equal to 99.5 percent, the granularity of Al powder is less than or equal to 25 mu m, and the purity is more than or equal to 99.7 percent.
In a preferred scheme, the binder comprises the following components in percentage by mass:
in the preferable scheme, in the feeding, the volume ratio of the aluminum alloy powder raw material to the binder is 66-70%: 30-34%; the mixing process comprises the following steps: the mixing temperature is 150-160 ℃, and the mixing time is 1-5 h.
Preferably, the injection molding process comprises: the temperature of the mould is 60-80 ℃, the injection temperature is 160-190 ℃, and the injection pressure is 110-130 MPa.
Preferably, the first thermal degreasing process comprises: vacuumizing, heating to vacuum degree less than 10-3And when Pa is needed, heating to 250-280 ℃ at a speed of 1-5 ℃/min, preserving heat for 60-120 min, and cooling along with the furnace.
Preferably, the hot isostatic pressing forming process comprises the following steps: the forming temperature is 130-150 ℃, the forming pressure is 110-140 MPa, and the sheath material is rubber or plastic.
Preferably, the second thermal degreasing and sintering densification are integrated, and specifically include: vacuumizing, heating to vacuum degree less than 10-3And when Pa is needed, heating to 370-400 ℃ at a speed of 1-3 ℃/min, preserving heat for 60-90 min, heating to 580-600 ℃ at a speed of 1-3 ℃/min, preserving heat for 60-120 min, and cooling along with the furnace.
In the preferred scheme, the solution aging heat treatment process comprises the following steps: the solution treatment comprises the following steps: vacuumizing, heating to vacuum degree less than 10-3Heating Pa to 520-540 ℃ at the speed of 8-10 ℃/min, preserving heat for 4-6 h, and water quenching; the aging treatment comprises the following steps: vacuumizing, heating to vacuum degree less than 10-3Pa, heating to 150-170 ℃ at a speed of 6-8 ℃/min, preserving heat for 1-4 h, and air cooling.
Principles and advantages
The invention utilizes the metal injection molding technology, and simultaneously introduces the technical means of powder pretreatment, green blank hot isostatic pressing and the like to prepare the Al-Si-Mg series aluminum alloy with the performance comparable to that of cast alloy, and provides a preparation method of a high-quality aluminum alloy product.
The invention adds high-content Mg in an Al-50Mg mode, and has two purposes: firstly, an oxide film exists on the surface of an aluminum-containing powder raw material to hinder sintering, Mg is used as a main component for breaking the oxide film, sufficient Mg content ensures the film breaking effect, and an Al-50Mg component is located near an aluminum-magnesium binary phase diagram eutectic point component to facilitate forming an aluminum-magnesium eutectic liquid phase and accelerate film breaking; secondly, Mg element reacts with Si element to generate strengthening phase Mg2Si and Mg in Al breaking2O3After the Al-Mg oxide is formed, enough content of the Al-Mg oxide still reacts with Si to generate a strengthening phase, and good mechanical properties after heat treatment are ensured.
The binder components used in the present invention are palm wax (CW), ethylene-vinyl acetate copolymer (EVA), High Density Polyethylene (HDPE), atactic polypropylene (APP) and Stearic Acid (SA). The selected binder components are not easy to absorb moisture and do not react with the powder, and can form effective package after mixing, thereby preventing the thickness of the oxide film of the metal powder from being increased due to moisture absorption. The CW melting point in the components is low, the decomposition rate is high at about 250 ℃, the CW melting point can be quickly removed at a lower temperature, and the viscosity is low in a melting state, so that the viscosity can be reduced, and the feeding fluidity can be improved; in order to prevent the problem of deformation caused by too fast removal of a single component during secondary degreasing, polymers with different decomposition temperatures are selected as a binder support component after CW removal, and HDPE and APP are selected as a bracket after CW removal to maintain the shape and strength of a green body; the compatibility of APP and HDPE is poor, in order to prevent uneven mixing, a small amount of EVA is selected to be added as a compatibilizer, so that the feeding uniformity is improved, and the powder agglomeration phenomenon is prevented; stearic acid acts as a surfactant. Because catalytic degreasing is easy to aggravate the moisture absorption phenomenon and increase the thickness of an oxide film, solvent degreasing takes long time and a green blank is easy to deform, the invention adopts a mode of hot degreasing twice under a vacuum environment to remove a binder, and the powder is dried and dispersed in advance before forming, thereby effectively solving the problems of uneven material mixing and thickening of the oxide film caused by easy moisture absorption and agglomeration of the aluminum alloy powder.
According to the invention, the hot isostatic pressing technology is introduced after the first hot degreasing of the product, so that the stress on each part of the product is uniform, the density of each part of the blank is more consistent, the density reduced due to small injection pressure is supplemented, the structure after sintering is more uniform and compact, and the size precision and the sintering quality of the product are further ensured.
The product prepared by the invention has higher performance, the tensile strength is more than or equal to 240MPa, the elongation is more than or equal to 1.5%, and the density is more than or equal to 95%, and the product can be comparable with the strength of the aluminum alloy with similar components prepared by the casting method.
Drawings
FIG. 1 is a metallographic structure diagram of an aluminum alloy sintered compact in example 2.
Detailed Description
The process of the present invention is further illustrated below with reference to three examples.
Example 1:
a metal injection molding method of Al-Si-Mg series aluminum alloy comprises the following steps:
A. preparing alloy and binder raw materials: the raw powder material is ZL101 powder with the granularity of 18 mu m and the purity of more than or equal to 99.7 percent; al-50Mg powder with the granularity of 25 mu m and the purity of more than or equal to 99.5 percent; al-12Si powder with the granularity less than or equal to 25 mu m and the purity more than or equal to 99 percent; al powder with the granularity less than or equal to 25 mu m and the purity more than or equal to 99.7 percent; wherein the specific components of the Zl101 powder are shown in the following table:
| element(s) | Al | Mg | Si | Ti | Other impurities |
| Content (%) | 91.5 | 0.28 | 7.99 | 0.14 | ≤0.1 |
The metal raw material powders were weighed in terms of mass percentages of 6.8% Si, 2% Mg, and 91.2% Al, and 50% palm wax (CW), 25% High Density Polyethylene (HDPE), 15% random polypropylene (APP), 5% ethylene-vinyl acetate copolymer (EVA), and 5% Stearic Acid (SA) were weighed in terms of mass ratios.
B. Material pretreatment: mixing metal powder and HDPEEVA and APP are placed in a vacuum drying oven, a molecular sieve drying agent is placed in the drying oven, and the degree of vacuum pumping is up to 10-1Heating to 90 deg.C below Pa, drying for 10 hr, cooling, and sieving with 38 μm ultrasonic vibration sieve.
C. Preparing a feed: the metal powder and binder were mixed at a ratio of 70: and (3) mixing the mixture with the volume ratio of 30 in an internal mixer, then granulating to obtain a feed, adding a high-melting-point binder for blending firstly during mixing, adding a low-melting-point binder for blending secondly during mixing, and then adding the powder according to the consistent principle, wherein the mixing temperature of the internal mixer is 150 ℃ and the mixing time is 4 hours.
D. Injection molding: the feedstock was injection molded using an injection molding machine at an injection temperature of 165 ℃ and an injection pressure of 130 MPa.
E. First thermal degreasing: vacuumizing, heating to vacuum degree less than 10-3And Pa, heating to 260 ℃ at the speed of 2 ℃/min, preserving heat for 120min, and then cooling along with the furnace.
F. Hot isostatic pressing: processing by a hot isostatic pressing machine, wherein the sheath material is rubber, the forming pressure is 120MPa, and the temperature is 130 ℃.
G. And (3) sintering: putting the blank subjected to the hot isostatic pressing treatment into a vacuum sintering furnace for sintering; vacuumizing, heating to vacuum degree less than 10-3And after Pa, heating to 380 ℃ at the speed of 2.5 ℃/min, preserving heat for 90min, heating to 580 ℃ at the speed of 2 ℃/min, preserving heat for 120min, and cooling along with the furnace.
H. And (3) heat treatment: carrying out heat treatment on the sintered blank by using a vacuum sintering furnace; heating to 520 ℃ at the speed of 8 ℃/min, preserving heat for 4h, performing water quenching, then putting into a drying oven for drying for later use, performing aging treatment after drying, heating to 150 ℃ at the speed of 6 ℃/min, preserving heat for 2h, and performing air cooling. The mechanical property of the product is detected after heat treatment, the tensile strength is 247.5MPa, the elongation is 2.1 percent, and the density is 96 percent.
Example 2:
a metal injection molding method of Al-Si-Mg series aluminum alloy comprises the following steps:
A. preparing alloy and binder raw materials: the raw powder material is ZL101 powder with the granularity of 18 mu m and the purity of more than or equal to 99.7 percent; al-50Mg powder with the granularity of 25 mu m and the purity of more than or equal to 99.5 percent; al-12Si powder with the granularity less than or equal to 25 mu m and the purity more than or equal to 99 percent; al powder with the granularity less than or equal to 25 mu m and the purity more than or equal to 99.7 percent; wherein the specific components of the Zl101 powder are shown in the following table:
| element(s) | Al | Mg | Si | Ti | Other impurities |
| Content (%) | 91.5 | 0.28 | 7.99 | 0.14 | ≤0.1 |
The metal raw material powders were weighed with the mass percentages of 8.5% Si, 4% Mg, and 87.5% Al, and 40% palm wax (CW), 30% High Density Polyethylene (HDPE), 20% random polypropylene (APP), 8% ethylene-vinyl acetate copolymer (EVA), and 2% Stearic Acid (SA) were weighed in mass ratio.
B. Material pretreatment: placing the metal powder raw material in a vacuum drying box, placing a molecular sieve drying agent in the drying box, and vacuumizing to 10 DEG-1Heating to 90 deg.C below Pa, drying for 10 hr, cooling, and sieving with 38 μm ultrasonic vibration sieve.
C. Preparing a feed: metal powder and binder at 66: and (3) mixing the materials in a 34 volume ratio in an internal mixer, then granulating to obtain a feed, adding a high-melting-point binder for blending firstly, then adding a low-melting-point binder for blending, and then adding the powder with the same principle, wherein the mixing temperature of the internal mixer is 160 ℃, and the mixing time is 2 hours.
D. Injection molding: the feedstock was injection molded using an injection molding machine at 190 ℃ and an injection pressure of 110 MPa.
E. First thermal degreasing: vacuumizing, heating to vacuum degree less than 10-3Pa, raising the temperature to 280 ℃ at the speed of 5 ℃/min, preserving the temperature for 60min, and then cooling along with the furnace.
F. Hot isostatic pressing: processing by a hot isostatic pressing machine, wherein the sheath material is plastic, the forming pressure is 130MPa, and the temperature is 135 ℃.
G. And (3) sintering: putting the blank subjected to the hot isostatic pressing treatment into a vacuum sintering furnace for sintering; vacuumizing, heating to vacuum degree less than 10-3And after Pa, heating to 400 ℃ at a speed of 3 ℃/min, preserving heat for 60min, heating to 590 ℃ at a speed of 2 ℃/min, preserving heat for 80min, and cooling along with the furnace.
H. And (3) heat treatment: carrying out heat treatment on the sintered blank by using a vacuum sintering furnace; heating to 540 ℃ at the temperature of 10 ℃/min, preserving heat for 6h, performing water quenching, then putting into a drying oven for drying for later use, performing aging treatment after drying, heating to the aging temperature of 150 ℃ at the temperature of 6 ℃/min, preserving heat for 4h, and performing air cooling. The mechanical property of the product is detected after heat treatment, the tensile strength is 266.7MPa, the elongation is 1.7 percent, and the density is 97 percent.
Example 3:
a metal injection molding method of Al-Si-Mg series aluminum alloy comprises the following steps:
A. preparing alloy and binder raw materials: the raw powder material is ZL101 powder with the granularity of 18 mu m and the purity of more than or equal to 99.7 percent; al-50Mg powder with the granularity of 25 mu m and the purity of more than or equal to 99.5 percent; al-12Si powder with the granularity less than or equal to 25 mu m and the purity more than or equal to 99 percent; al powder with the granularity less than or equal to 25 mu m and the purity more than or equal to 99.7 percent; wherein the specific components of the Zl101 powder are shown in the following table:
| element(s) | Al | Mg | Si | Ti | Other impurities |
| Content (%) | 91.5 | 0.28 | 7.99 | 0.14 | ≤0.1 |
The metal raw material powders were weighed in terms of mass percentages of 7.5% Si, 3.5% Mg, and 89.0% Al, and 45% palm wax (CW), 23% High Density Polyethylene (HDPE), 20% random polypropylene (APP), 8% ethylene-vinyl acetate copolymer (EVA), and 4% Stearic Acid (SA) were weighed in terms of mass ratios.
B. Material pretreatment: placing the metal powder raw material in a vacuum drying box, placing a molecular sieve drying agent in the drying box, and vacuumizing to 10 DEG-1Heating to 90 deg.C below Pa, drying for 10 hr, cooling, and sieving with 38 μm ultrasonic vibration sieve.
C. Preparing a feed: the metal powder and binder are mixed at 68: and mixing the materials in a 32 volume ratio in an internal mixer, then granulating to obtain a feed, adding a high-melting-point binder for blending firstly, adding a low-melting-point binder for blending secondly during mixing, and then adding the powder with the same principle, wherein the mixing temperature of the internal mixer is 160 ℃, and the mixing time is 2 hours.
D. Injection molding: the feedstock was injection molded using an injection molding machine at an injection temperature of 175 ℃ and an injection pressure of 120 MPa.
E. First thermal degreasing: vacuumizing, heating to vacuum degree less than 10-3And Pa, raising the temperature to 250 ℃ at the speed of 2 ℃/min, preserving the temperature for 90min, and then cooling along with the furnace.
F. Hot isostatic pressing: processing by a hot isostatic pressing machine, wherein the sheath material is plastic, the forming pressure is 130MPa, and the temperature is 140 ℃.
G. And (3) sintering: putting the blank subjected to the hot isostatic pressing treatment into a vacuum sintering furnace for sintering; vacuumizing, heating to vacuum degree less than 10-3And after Pa, heating to 370 ℃ at the speed of 2 ℃/min, preserving heat for 90min, heating to 600 ℃ at the speed of 3 ℃/min, preserving heat for 60min, and cooling along with the furnace.
H. And (3) heat treatment: carrying out heat treatment on the sintered blank by using a vacuum sintering furnace; raising the temperature to 530 ℃ at the speed of 8 ℃/min, preserving the heat for 4h, performing water quenching, then putting the mixture into a drying oven for drying for later use, performing aging treatment after drying, raising the temperature to 160 ℃ at the speed of 6 ℃/min, preserving the heat for 2h, and performing air cooling. The mechanical property of the product is detected after heat treatment, the tensile strength is 251.6MPa, the elongation is 1.9 percent, and the density is 96.4 percent.
Comparative example 1
This comparative example used a method substantially the same as that used in example 2, except that the metal powder and binder materials were not treated prior to preparation, and the final product had a heavily oxidized surface and was not sintered to be dense.
Comparative example 2
This comparative example employed substantially the same procedure as example 2, except for the alloy composition, and the results are shown in the following table:
comparative example 3
This comparative example used substantially the same procedure as in example 2, except that the hot isostatic pressing treatment was not performed after the first thermal degreasing, and the final product had a density of 89%, a tensile strength of 171.5MPa, and an elongation of 0.4%.
Comparative example 4
This comparative example used essentially the same procedure as example 2, except that the hot isostatic pressing parameters were different, and the specific parameters and comparative results are shown in the following table:
| numbering | Forming temperature/. degree.C | Forming pressure/MPa | Evaluation of |
| 1 | 140 | 90 | Density 92% and tensile strength 200.2MPa |
| 2 | 140 | 160 | Deformation of green bodies |
| 3 | 180 | 130 | Melting of the binder and deformation of the green body |
| 4 | 90 | 130 | Density 93% and tensile strength 210.1MPa |
Comparative example 5
This comparative example used a method substantially the same as that used in example 2, except that the sintering process was used, and the specific sintering process and comparison results are shown in the following table:
the above-described embodiments are merely exemplary embodiments of the present invention, which should not be construed as limiting the scope of the invention, but rather as indicating any equivalent variations, modifications, substitutions and combinations of parts within the spirit and scope of the invention.
Claims (10)
1. A metal injection molding method of an Al-Si-Mg series aluminum alloy, characterized by comprising the steps of: firstly, weighing an aluminum alloy powder raw material according to a design formula according to a stoichiometric ratio, carrying out pretreatment, then mixing and granulating the aluminum alloy powder raw material and a binder to obtain a uniform feed, injecting the feed into a die cavity by using an injection molding technology to obtain a product green body, then carrying out first thermal degreasing and hot isostatic pressing molding treatment on the green body, and finally sequentially finishing second thermal degreasing, sintering densification and solution aging heat treatment to obtain an aluminum alloy product;
the pretreatment comprises the following steps: drying and dispersing, namely placing the aluminum alloy powder raw material in a vacuum drying box, placing a drying agent in the drying box, preserving the heat for 10-12 hours at the temperature of 80-90 ℃, and dispersing the powder by using an ultrasonic vibration screen after cooling;
the drying agent is one of calcium chloride, silica gel or molecular sieve drying agent;
the hot isostatic pressing forming process comprises the following steps: the forming temperature is 130-150 ℃, the forming pressure is 110-140 MPa, and the sheath material is rubber or plastic.
2. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, wherein the aluminum alloy product comprises, in mass percent: si: 6.5-8.5%, Mg: 2-4% and the balance of Al.
3. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, wherein the aluminum alloy powder raw material is: ZL101 prealloying powder (the main elements are Al, Si and Mg), Al-12Si alloy powder, Al-50Mg alloy powder and Al powder; the grain size of the ZL101 prealloying powder is less than or equal to 18 mu m, and the purity is more than or equal to 99.9%; the granularity of the Al-12Si powder is less than or equal to 25 mu m, and the purity is more than or equal to 99.0 percent; the granularity of Al-50Mg is less than or equal to 25 mu m, the purity is more than or equal to 99.5 percent, the granularity of Al powder is less than or equal to 25 mu m, and the purity is more than or equal to 99.7 percent.
4. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, wherein the binder consists of, in mass percent:
40-50% of palm wax (CW),
20 to 30 percent of High Density Polyethylene (HDPE),
10-20% of atactic polypropylene (APP),
2-8% of ethylene-vinyl acetate copolymer (EVA),
2-5% of Stearic Acid (SA).
5. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, wherein in the feeding, a volume ratio of the aluminum alloy powder raw material to the binder is 66 to 70%: 30-34%; the mixing process comprises the following steps: the mixing temperature is 150-160 ℃, and the mixing time is 1-5 h.
6. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, characterized in that the injection molding process is: the temperature of the mold is 60-80 ℃, the injection temperature is 160-190 ℃, and the injection pressure is 110-130 MPa.
7. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, characterized in that the first thermal degreasing process is: first vacuumized and then liftedTemperature, vacuum degree less than or equal to 10-3And when Pa is needed, heating to 250-280 ℃ at a speed of 1-5 ℃/min, preserving heat for 60-120 min, and cooling along with the furnace.
8. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to claim 1, characterized in that the second thermal degreasing and sintering densification are integrated processes, specifically: vacuumizing, heating to vacuum degree less than 10-3And when Pa is needed, heating to 370-400 ℃ at a speed of 1-3 ℃/min, preserving heat for 60-90 min, heating to 580-600 ℃ at a speed of 1-3 ℃/min, preserving heat for 60-120 min, and cooling along with the furnace.
9. The metal injection molding method of an Al-Si-Mg-based aluminum alloy according to claim 1, wherein the solution treatment is: vacuumizing, heating to vacuum degree less than 10-3Heating Pa to 520-540 ℃ at the speed of 8-10 ℃/min, preserving heat for 4-6 h, and water quenching; the aging treatment comprises the following steps: vacuumizing, heating to vacuum degree less than 10-3Pa, heating to 150-170 ℃ at a speed of 6-8 ℃/min, preserving heat for 1-4 h, and air cooling.
10. The metal injection molding method of an Al-Si-Mg series aluminum alloy according to any one of claims 1 to 9, wherein the properties of the obtained aluminum alloy article are: the tensile strength is more than or equal to 240MPa, the elongation is more than or equal to 1.5 percent, and the density is more than or equal to 95 percent.
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| CN115927894A (en) * | 2022-12-08 | 2023-04-07 | 湖南英捷高科技有限责任公司 | Aluminum alloy material for automobile heat dissipation parts and preparation method thereof |
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| CN115927894A (en) * | 2022-12-08 | 2023-04-07 | 湖南英捷高科技有限责任公司 | Aluminum alloy material for automobile heat dissipation parts and preparation method thereof |
| CN115927894B (en) * | 2022-12-08 | 2024-02-27 | 湖南英捷高科技有限责任公司 | Aluminum alloy material for automobile heat dissipation parts and preparation method thereof |
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