CN111500882A - Method for improving performance of secondary aluminum - Google Patents
Method for improving performance of secondary aluminum Download PDFInfo
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- CN111500882A CN111500882A CN202010255452.XA CN202010255452A CN111500882A CN 111500882 A CN111500882 A CN 111500882A CN 202010255452 A CN202010255452 A CN 202010255452A CN 111500882 A CN111500882 A CN 111500882A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/001—Dry processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for improving the performance of secondary aluminum, which adopts the technical scheme that the secondary aluminum is preheated to 350-.
Description
Technical Field
The invention belongs to the technical field of non-ferrous metal regeneration and recovery melt treatment, and particularly relates to a method for improving the performance of secondary aluminum.
Background
The demand for lightweight structural components is increasing as green economic development strategies suggest. Due to the advantages of good weldability, low expansion coefficient, strong corrosion resistance, thermal stability and the like of the Al-Si alloy, the Al-Si alloy is widely concerned by researchers. In recent years, the recycling of secondary aluminum has become a mainstream trend for energy saving and environmental protection.
Fe is a main impurity element in aluminum alloys, and its content gradually increases with the recycling. Therefore, the secondary aluminum generally contains a relatively high content of Fe. In order to improve the utilization efficiency of the secondary aluminum, the control of the Fe content is very strict. The presence of Fe forms long-acicular hard compounds and reduces the performance of the alloy. At present, the technology except Fe is still not mature, and the Fe characteristic appearance is mainly changed by chemical modification or increasing the cooling rate. However, both methods have various disadvantages, such as the increase in the volume fraction of the second phase due to chemical deterioration; it is difficult to increase the cooling rate in the industry.
CN201310545026.X, a method for removing iron from recycled aluminum, utilizes Al-B and Al-Mn intermediate alloy to reduce Fe content in an auxiliary vibration die and improve the performance of the recycled aluminum, but the treated Fe content is only less than 1.2 wt%, the obtained mechanical performance is not high, the tensile strength is 155MPa, and the elongation is 3.5%.
CN102304649A recycled aluminum alloy deferrization flux, which comprises 20-40% of a recycled aluminum refining agent, 30-50% of manganese chloride and the balance of coke, and uniformly scattering the mixed flux on the liquid surface, wherein the deferrization rate reaches 52.65%, but the mechanical properties of the recycled aluminum after deferrization are not mentioned. There is therefore a need to find a simple and economical conventional method for improving the properties of high Fe content recycled aluminium alloys.
Disclosure of Invention
The invention aims to provide a method for improving the performance of a recycled aluminum alloy, which aims to solve the problem of low performance of the recycled aluminum in the prior art and realize the methods for refining the structure of the recycled aluminum, refining Fe phase and reducing porosity.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows:
a method for improving the performance of secondary aluminum is characterized in that:
1) firstly, preheating the secondary aluminum to the temperature of 350-400 ℃, and then heating to the temperature of 730-760 ℃ for melting;
2) adding a Ti/B-containing intermediate alloy into the melt, wherein the mass fraction of the Ti/B-containing intermediate alloy is 0-38 wt.%, adding the Sr-containing intermediate alloy, then performing auxiliary stirring at 750 +/-5 ℃, refining, degassing, slagging off, and keeping the temperature for 10-20 min.
The recycled aluminum alloy can be recycled cast A356.2 alloy.
The intermediate alloy is Al4Ti1.7B.
The invention relates to a method for improving the performance of secondary aluminum, which is to add an intermediate alloy containing Ti/B into an aluminum melt and release Al in the melt3Ti and TiB2The particles, α -Al heterogeneous nucleation sites, reduce grain size, increase feeding capacity, and further reduce porosity, excess Ti forms Ti (AlSi)3The phase can be used as β -Fe nucleation particles, the growth direction of the Fe-rich phase is changed, the size and the shape of the Fe-rich phase are reduced, Sr and auxiliary stirring can refine crystal grains and break a brittle hard phase, and the performance of the alloy is improved.
By adopting the technical scheme in the scheme, the method has the advantages that: the method can reduce the grain size, reduce the porosity, refine the Fe-rich phase and change the appearance of the Fe-rich phase, thereby improving the structure of the regenerated aluminum and improving the regenerated aluminum, and further obviously improving the regeneration recovery rate of the aluminum alloy.
Drawings
FIG. 1 is an as-cast OM representation of the alloy of example 1;
FIG. 2 is an as-cast OM diagram of the alloy of example 2
FIG. 3 is an as-cast OM view of the alloy of example 3;
Detailed Description
The technical solutions in the embodiments of the present invention will be described in detail below with reference to the embodiments of the present invention and the accompanying drawings. The examples are merely illustrative of the scope of the invention. In the other examples, the specific technical steps or conditions are shown and described in the literature or product specifications in the field. The reagents or instruments used are not indicated by manufacturers, and are all conventional products available from commercial sources.
The present invention is further illustrated by the following examples, which should not be construed as limiting the scope of the invention.
Example 1
a) Firstly, placing 2KgA356.2 alloy in a crucible furnace, heating to 400 ℃ for preheating, and then heating to 750 ℃ until the alloy is completely melted;
b) then 110g of Al4Ti1.7B is pressed into the melt and the temperature is kept for 15 min;
c) adding 0.2 wt.% of Al-8Sr, manually stirring with a graphite rod, and standing for 10 min;
d) introducing into graphite rotor degassing equipment, adjusting the rotating speed to 300r/min, and violently stirring for 30 min;
e) stirring, keeping the temperature at 735 ℃ for 15min, heating to 750 ℃, adding 40g of hexachloroethane wrapped by aluminum foil, degassing, refining, slagging off, and keeping the temperature for 15 min;
f) casting to obtain a standard cast tensile bar 1.
Example 2
a) Firstly, placing 2KgA356.2 alloy in a crucible furnace, heating to 400 ℃ for preheating, and then heating to 750 ℃ until the alloy is completely melted;
b) then, 230g of Al4Ti1.7B is pressed into the melt and the temperature is kept for 15 min;
c) adding 0.18 wt.% of Al-8Sr, manually stirring with a graphite rod, and standing for 10 min;
d) introducing into graphite rotor degassing equipment, adjusting the rotating speed to 350r/min, and violently stirring for 25 min;
e) stirring, keeping the temperature at 735 ℃ for 15min, heating to 750 ℃, adding 40g of hexachloroethane wrapped by aluminum foil, degassing, refining, slagging off, and keeping the temperature for 15 min;
f) casting to obtain a standard cast tensile bar 2.
Example 3
a) Firstly, placing 2KgA356.2 alloy in a crucible furnace, heating to 400 ℃ for preheating, and then heating to 750 ℃ until the alloy is completely melted;
b) then 450g of Al4Ti1.7B is pressed into the melt and the temperature is kept for 15 min;
c) adding 0.25 wt.% of Al-8Sr, manually stirring with a graphite rod, and standing for 10 min;
d) introducing into graphite rotor degassing equipment, adjusting the rotating speed to 400r/min, and stirring vigorously for 15 min;
e) stirring, keeping the temperature at 735 ℃ for 15min, heating to 750 ℃, adding 40g of hexachloroethane wrapped by aluminum foil, degassing, refining, slagging off, and keeping the temperature for 15 min;
f) casting to obtain a standard cast tensile bar 3.
Example 4
a) Firstly, placing 2KgA356.2 alloy in a crucible furnace, heating to 400 ℃ for preheating, and then heating to 750 ℃ until the alloy is completely melted;
b) then 52g of Al4Ti1.7B is pressed into the melt and the temperature is kept for 15 min;
c) adding 0.05 wt.% of Al-8Sr, manually stirring with a graphite rod, and standing for 10 min;
d) introducing into graphite rotor degassing equipment, adjusting the rotation speed to 250r/min, and violently stirring for 40 min;
e) stirring, keeping the temperature at 735 ℃ for 15min, heating to 750 ℃, adding 40g of hexachloroethane wrapped by aluminum foil, degassing, refining, slagging off, and keeping the temperature for 15 min;
f) casting to obtain a standard cast tensile bar 4.
Example 5
a) Firstly, placing 2KgA356.2 alloy in a crucible furnace, heating to 400 ℃ for preheating, and then heating to 750 ℃ until the alloy is completely melted;
b) then 752g of Al4Ti1.7B are pressed into the melt and the temperature is kept for 15 min;
c) adding 0.4 wt.% of Al-8Sr, manually stirring with a graphite rod, and standing for 10 min;
d) introducing into graphite rotor degassing equipment, adjusting the rotation speed to 500r/min, and vigorously stirring for 10 min;
e) stirring, keeping the temperature at 735 ℃ for 15min, heating to 750 ℃, adding 40g of hexachloroethane wrapped by aluminum foil, degassing, refining, slagging off, and keeping the temperature for 15 min;
f) casting to obtain a standard cast tensile bar 5.
The cast aluminum alloy standard samples 1 to 5 prepared in examples 1 to 5 above were subjected to composition tests, and the alloy compositions are shown in table 1.
TABLE 1 chemical composition in examples
| Element(s) | Si | Mg | Fe | Ti | B | Sr | Al |
| Example 1 | 6.88 | 0.33 | 1.52 | 0.24 | 0.082 | 0.014 | Balance of |
| Example 2 | 7.02 | 0.31 | 1.48 | 0.52 | 0.168 | 0.011 | Balance of |
| Example 3 | 6.92 | 0.32 | 1.49 | 0.98 | 0.312 | 0.017 | Balance of |
| Example 4 | 6.85 | 0.35 | 1.51 | 0.10 | 0.034 | 0.002 | Balance of |
| Example 5 | 7.01 | 0.34 | 1.53 | 1.52 | 0.580 | 0.028 | Balance of |
Mechanical Property test
The standard aluminum alloy standards 1 to 5 prepared in the above examples 1 to 5 were respectively subjected to a performance test (universal tester), and the test results are shown in Table 2.
TABLE 2 Performance test Table
According to the data in tables 1 and 2, the cast property of the regenerated aluminum alloy treated by the method is much higher than the untreated mechanical property, the yield strength is improved by about 100MPa to the maximum extent, and the improvement rate is about 80 percent; the tensile strength is improved by about 50 percent, and the elongation is improved by more than 150 percent. The overall performance of example 2 is optimal.
The invention provides a method for improving the performance of secondary aluminum, which comprises the steps of adding an intermediate alloy containing Ti/B into an aluminum melt, and releasing Al in the melt3Ti and TiB2The particles, α -Al heterogeneous nucleation sites, reduce grain size, increase feeding capacity, and further reduce porosity, excess Ti forms Ti (AlSi)3The method has the advantages that the method can reduce the grain size, reduce the porosity, refine the Fe-rich phase and change the morphology of the Fe-rich phase, thereby improving the regenerated aluminum structure and improving the regenerated aluminum, and is suitable for the field of improving the performance of the regenerated aluminum.
The present invention is not limited to the above preferred embodiments, and modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention are included in the scope of the present invention.
Claims (5)
1. A method for improving the performance of secondary aluminum is characterized by comprising the following steps:
1) firstly, preheating the secondary aluminum to the temperature of 350-400 ℃, and then heating to the temperature of 730-760 ℃ for melting;
2) adding the Ti/B-containing intermediate alloy into the melt, wherein the mass fraction of the Ti/B-containing intermediate alloy is 0-38 wt.%, adding the Sr-containing intermediate alloy, then performing auxiliary stirring refining degassing and slag removal at 750 +/-5 ℃, preserving heat for 10-20min, and casting.
2. A method for improving the performance of secondary aluminum according to claim 1, wherein: the recycled aluminum alloy may be a recycled cast a356.2 alloy.
3. A method for improving the performance of secondary aluminium according to claim 1, characterized in that the Ti/B containing intermediate alloy is an al4ti1.7b composition.
4. The method for improving the performance of secondary aluminum according to claim 1, wherein the Sr-containing master alloy is comprised of Al-8Sr in an amount of 0.01-0.5 wt.%.
5. The method for improving the performance of the secondary aluminum according to claim 1, wherein the auxiliary stirring is performed by using a graphite rotor device, the rotating speed is 150r/min-600r/min, and the stirring time is 10-60 min.
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Citations (9)
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|---|---|---|---|---|
| US4576791A (en) * | 1984-02-27 | 1986-03-18 | Anglo Blackwells Limited | Aluminium-strontium-titanium-boron master alloy |
| CN101844218A (en) * | 2009-03-28 | 2010-09-29 | 王宏波 | Low pressure casting process for aluminum alloy cylinder part |
| CN102312137A (en) * | 2011-09-09 | 2012-01-11 | 中兴通讯股份有限公司 | Aluminum-silicon-magnesium casted aluminum alloy and casting process thereof |
| CN102994824A (en) * | 2012-12-04 | 2013-03-27 | 闫卫平 | Stable operation method for restraining deteriorated alusil alloy strontium from inhaling |
| CN104357692A (en) * | 2014-11-15 | 2015-02-18 | 安徽省新方尊铸造科技有限公司 | Technique for producing aluminum alloy wheel hub from recycled aluminum |
| CN105671350A (en) * | 2015-03-19 | 2016-06-15 | 中信戴卡股份有限公司 | Aluminum alloy refiner, preparation method therefor and use thereof |
| CN108823446A (en) * | 2018-07-16 | 2018-11-16 | 山东华宇合金材料有限公司 | A kind of process improving A356.2 Mechanical Properties of Aluminum Alloys |
| CN108994279A (en) * | 2018-07-18 | 2018-12-14 | 大亚车轮制造有限公司 | A kind of low-pressure casting process of bus aluminium alloy wheel hub of vehicle |
| CN109385544A (en) * | 2018-09-17 | 2019-02-26 | 上海大学 | Cast Al-Si alloy Al-M-B grain refiner and preparation method thereof |
-
2020
- 2020-04-02 CN CN202010255452.XA patent/CN111500882A/en active Pending
Patent Citations (9)
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|---|---|---|---|---|
| US4576791A (en) * | 1984-02-27 | 1986-03-18 | Anglo Blackwells Limited | Aluminium-strontium-titanium-boron master alloy |
| CN101844218A (en) * | 2009-03-28 | 2010-09-29 | 王宏波 | Low pressure casting process for aluminum alloy cylinder part |
| CN102312137A (en) * | 2011-09-09 | 2012-01-11 | 中兴通讯股份有限公司 | Aluminum-silicon-magnesium casted aluminum alloy and casting process thereof |
| CN102994824A (en) * | 2012-12-04 | 2013-03-27 | 闫卫平 | Stable operation method for restraining deteriorated alusil alloy strontium from inhaling |
| CN104357692A (en) * | 2014-11-15 | 2015-02-18 | 安徽省新方尊铸造科技有限公司 | Technique for producing aluminum alloy wheel hub from recycled aluminum |
| CN105671350A (en) * | 2015-03-19 | 2016-06-15 | 中信戴卡股份有限公司 | Aluminum alloy refiner, preparation method therefor and use thereof |
| CN108823446A (en) * | 2018-07-16 | 2018-11-16 | 山东华宇合金材料有限公司 | A kind of process improving A356.2 Mechanical Properties of Aluminum Alloys |
| CN108994279A (en) * | 2018-07-18 | 2018-12-14 | 大亚车轮制造有限公司 | A kind of low-pressure casting process of bus aluminium alloy wheel hub of vehicle |
| CN109385544A (en) * | 2018-09-17 | 2019-02-26 | 上海大学 | Cast Al-Si alloy Al-M-B grain refiner and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
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