CN111004935A - Preparation method of high-purity aluminum-strontium intermediate alloy wire - Google Patents
Preparation method of high-purity aluminum-strontium intermediate alloy wire Download PDFInfo
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- CN111004935A CN111004935A CN201911335216.2A CN201911335216A CN111004935A CN 111004935 A CN111004935 A CN 111004935A CN 201911335216 A CN201911335216 A CN 201911335216A CN 111004935 A CN111004935 A CN 111004935A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D1/00—Treatment of fused masses in the ladle or the supply runners before casting
- B22D1/002—Treatment with gases
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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
- B22D35/00—Equipment for conveying molten metal into beds or moulds
- B22D35/04—Equipment for conveying molten metal into beds or moulds into moulds, e.g. base plates, runners
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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
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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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
- C22C21/04—Modified aluminium-silicon alloys
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Abstract
The invention provides a preparation method of a high-purity aluminum-strontium intermediate alloy wire, which comprises the steps of adding an aluminum ingot into an electric furnace, melting the aluminum ingot into molten aluminum, refining the molten aluminum, and removing floating slag on the surface of the molten aluminum after the molten aluminum is refined; adding metal strontium in batches; the casting liquid firstly flows through a flow groove provided with a steady flow table, then flows through a double-layer sleeve and finally flows into a die casting blank; and (4) extrusion molding. The invention redesigns the production process flow, improves the casting mode and leads the Al-Sr intermediate alloy Al to be4Sr particle size and oxide contentGreatly improved and the metamorphic effect is improved. Experimental results show that Al in the aluminum-strontium intermediate alloy wire provided by the invention4The Sr particle has an average size of 20-60 μm, the content of oxidation slag inclusion is less than or equal to 1000 μm under 500 times of microscopic tissue, and the modification effect is already effective within 30 s. The preparation method provided by the invention is simple, easy to control and suitable for large-scale industrial production.
Description
Technical Field
The invention relates to the field of metal materials, relates to an aluminum-strontium intermediate alloy wire, and in particular relates to a preparation method of a high-purity aluminum-strontium intermediate alloy wire.
Background
Aluminum-silicon alloy alterants are various, and Na and Sr are used for modification at present. In practical application, sodium deterioration has many problems, such as short effective time, low absorption rate, easy corrosion tools, adverse cutting processing, easy shrinkage and loosening, influence on alloy quality, and certain influence on the health of workers and environment, so sodium deterioration is gradually replaced. Strontium modification has the advantages of good effect, small dosage, long effect, remelting property, wide modification temperature range, no over-modification effect, insensitivity to cooling speed, no corrosion to tools and no environmental pollution, thereby arousing wide attention of people.
The Al-Sr intermediate alloy is mainly used for modification of hypoeutectic and eutectic aluminum-silicon alloys, Sr is adsorbed on eutectic silicon after the Al-Sr intermediate alloy is added into the alloy, and after a certain concentration is reached, the growth of eutectic silicon steps is prevented, and a large amount of generated twin crystal eutectic silicon grows in twin crystal grooves, so that the modification effect is achieved.
The difficulty of the production process of the Al-Sr intermediate alloy lies in the control of the purity, the traditional process method can only achieve more than 3000 mu m, when the slag content of the product is larger, the gas suction condition is increased after the product is added, so that the oxidation of the strontium element is increased, the burning loss condition of the strontium element is aggravated, the strontium element content in the melt is reduced, and when a high-quality cast aluminum-silicon casting is produced, the slag inclusion condition of the product is serious, the product quality of the casting is influenced, and the mechanical property is reduced.
We find that in the casting process, vortex and surge phenomena can be generated due to melt flowing, strontium element is easy to oxidize, oxidation scum on the surface at a certain temperature is stirred into the melt along with the vortex and surge generated by the melt, and flows into blank materials along with the melt and then flows into products, so that the purity of the products is not up to standard.
Disclosure of Invention
The invention aims to overcome the defects of the traditional process and provides a preparation method of a high-purity aluminum-strontium intermediate alloy wire rod, which is used for modifying aluminum-silicon alloy.
The technical scheme for realizing the purpose of the invention is as follows:
a preparation method of a high-purity aluminum-strontium intermediate alloy wire rod comprises the following steps:
(1) adding an aluminum ingot into an electric furnace, heating to 670-1200 ℃, melting an aluminum material into aluminum liquid in the electric furnace, adding a surface covering agent, refining the melt, and removing the surface scum after the refining is finished;
(2) pressing metal strontium into the aluminum liquid to melt the metal strontium, and preparing an aluminum ingot: the mass ratio of the metal strontium is 8-10: 1;
(3) cutting off the power, refining the melt, cleaning floating slag on the surface after finishing refining, and supplementing a covering agent;
(4) repeating the operations (2) and (3) until all the metal strontium is added;
(5) after the metal is added, the melt is heated to 780-1200 ℃ and then is cast;
(6) the casting liquid firstly flows through a flow groove provided with a steady flow table, then flows through a double-layer sleeve and finally flows into a die casting blank;
(7) and (4) extrusion molding.
And the launder with the steady flow tables is characterized in that a plurality of groups of steady flow tables are uniformly arranged in the launder at intervals, each group of steady flow tables comprises an upper blocking table and a lower blocking table, the upper blocking table and the lower blocking table are arranged at intervals in a staggered mode, the height of the upper blocking table is 2.8 +/-1 cm, and the height of the lower blocking table is 4.6 +/-2 cm. The flow stabilizing table can adjust the flow state of the melt in the launder, adjust the flow of the melt to be approximate to a laminar flow state, ensure that scum on the surface of the melt is not involved in the melt through the laminar flow, avoid the scum on the surface of the melt from being involved in the melt when vortexes or surges and other conditions occur in the flow process of the melt in the launder, and enable the oxidized slag inclusion in the melt to be settled to the maximum extent; the flow direction of the melt is improved, the residence time of the melt in the launder is increased, and the inclusions are allowed to settle to the maximum extent. Because the molten steel needs to be stopped in the launder for a long time, an automatic heating system is added, the temperature is ensured to be in a relatively constant interval, the flowability of the molten steel is ensured to be relatively stable, and the stable operation of the production flow is ensured.
And the double-layer sleeve is composed of an inner layer pipe and an outer layer pipe, the inner layer pipe is a graphite pipe, the outer layer pipe is a stainless steel pipe, the outer layer pipe is 2-3 cm longer than the inner layer pipe, and an air inlet is formed in the outer layer pipe and connected with a nitrogen source.
The invention has the advantages and beneficial effects that:
1. the aluminum-strontium intermediate alloy provided by the invention comprises 1-22 wt% of Sr, less than 0.20 wt% of Si, less than 0.30 wt% of Fe and the balance of Al according to mass content. The high-purity aluminum-strontium intermediate alloy wire provided by the invention improves the casting mode by redesigning the production process flow, so that the aluminum-strontium intermediate alloy Al is obtained4The Sr particle size and the oxide content are greatly improved, and the modification effect is improved. Experimental results show that Al in the aluminum-strontium intermediate alloy wire provided by the invention4The Sr particle has an average size of 20-60 μm, the content of oxidation slag inclusion is less than or equal to 1000 μm under 500 times of microscopic tissue, and the modification effect is already effective within 30 s. The preparation method provided by the invention is simple, easy to control and suitable for large-scale industrial production.
2. After the launder steady flow table device is added, the launder steady flow table has a regulating effect on the melt flow, the melt is controlled in a mode similar to advective flow through the control of the upper baffle table and the lower baffle table, the turbulent flow slagging condition of the melt in the casting process is reduced, the laminar flow of the fluid is regulated, the slag inclusion is settled due to gravity in the melt flow process and is blocked by the launder steady flow table, the slag inclusion is prevented from flowing into a casting blank, the purity of the product is improved, and the high-purity aluminum-strontium intermediate alloy production technology is realized.
Drawings
FIG. 1 is a view of the construction of the launder of the present invention;
FIG. 2 is an enlarged view of section C of FIG. 1;
FIG. 3 is a sectional view taken along line A-A of FIG. 2;
FIG. 4 is a sectional view taken along line B-B of FIG. 2;
FIG. 5 is an enlarged view of the structure of the double-walled sleeve;
FIG. 6 is a process flow diagram of the present invention.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
Example 1:
(1) preparing materials: 99.99 aluminum ingot and metal strontium
(2) Adding 360kg of aluminum ingot into an electric furnace, heating to melt the aluminum material into aluminum liquid in the electric furnace, adjusting the temperature to 670-.
(3) 2.5kg of metal strontium is pressed into the molten aluminum by using a special tool, and the next operation is carried out after the metal strontium is completely melted until 10kg of metal strontium is added.
(4) After the metal strontium is added, the power is cut off for refining because the strontium and the aluminum are very active, the high-temperature oxidation degree is reduced, the temperature of the melt is adjusted to 700-.
(5) Repeating the operations 3 and 4, controlling the melt temperature at 730-1200 ℃, and gradually adding the metal strontium.
(6) And after the metal is added, the temperature of the melt is raised to 780-1200 ℃ for casting.
The casting liquid flows through a flow groove without a flow stabilization platform and a double-layer sleeve in sequence, the double-layer sleeve is opened in the casting blank process, the gas flow is 2500ml/h, and the casting cooling water flow is adjusted through inert gas protection in the casting process: 1.4-6.6m3/h、 1.2-1.4m3/h、0.6-0.8m3/h，0.9-1.1m3/h、0.8-1.0m3/h、0.9-1.1m3H; the casting blank is ensured to be cooled and formed, and the speed of the extruder is 4.5-9.5 r/min.
After the production is finished according to the flow, the inspection is carried out, and the inspection results are specifically shown in the following tables 1 and 2:
table 1 ingredient test results
After the launder flow stabilization table is not installed and only the strontium and the double-layer sleeve device are added in batches, the product components meet the internal control standard, the impurity elements do not exceed the standard, and the main component strontium element also meets the internal control requirement.
TABLE 2 Al4Sr particle size and content of oxidized slag inclusions
A launder steady flow table is not installed, only the strontium and the double-layer sleeve device are added in batches, the content of the oxide of the product exceeds the standard, slag inclusion remained in the product is checked in the test process, and the components of the slag are mainly aluminum oxide and strontium oxide. Thereby determining that the oxidation occurs in the production process of the product.
Example 2
The flow groove 1 is evenly provided with a plurality of groups of flow stabilizing tables 2 at intervals, each flow stabilizing table is formed by an upper blocking table and a lower blocking table which are arranged at intervals in a staggered mode, the height of the upper blocking table is 2.8 +/-1 cm, and the height of the lower blocking table is 4.6 +/-2 cm. The double-layer sleeve 3 is connected at the tail end of the launder, the inner layer pipe adopts an about 13-15cm graphite pipe as a guide pipe, on one hand, the cleaning is convenient, the next use is convenient, on the other hand, the phenomena of breakage and the like are avoided under the condition of long-term high temperature, the outer layer pipe adopts a 15-17cm (the outer pipe is about 2cm longer than the inner pipe) stainless steel pipe to carry out sleeve protection, argon is introduced for protection, the vacuum state is simulated, in the whole process that the melt flows into the casting blank mould, the contact with air is avoided from occurring and from beginning to end under the wrapping of the argon, the oxidation is avoided, and the vacuum-.
(1) Preparing materials: 99.99 aluminum ingot and metal strontium.
(2) Adding 360kg of aluminum ingot into an electric furnace, heating to melt the aluminum material into aluminum liquid in the electric furnace, adjusting the temperature to 670-.
(3) Pressing 2.5kg of metal strontium into the molten aluminum by using a special tool, and continuing to fully perform the next operation after the metal strontium is completely molten until 40kg of metal strontium is completely added.
(4) After the metal strontium is added, the refining is interrupted, the temperature of the melt is adjusted to 700 ℃ and 1200 ℃, the surface scum is cleaned, and the covering agent is supplemented.
(5) Heating the melt to 730-plus 1200 ℃ for casting, wherein the casting liquid sequentially flows through a flow groove provided with a steady flow table and a double-layer sleeve, the inert gas is used for protection in the casting process, and the cooling water is adjusted in the casting blank process to ensure that the casting blank is rapidly cooled and reduce the occurrence of the segregation phenomenon: 1.4-1.6m3/h、1.2-1.4m3/h、0.6-0.8m3/h，0.9-1.1m3/h、0.8-1.0m3/h、0.9-1.1m3H; the rapid cooling and forming of the casting blank are ensured, the casting blank is extruded after being formed, and the speed of an extruder is 4.5-9.5 r/min.
After the production is finished according to the flow, the inspection is carried out, and the inspection results are specifically shown in the following tables 3 and 4:
table 3 ingredient test results
After the launder flow stabilization platform is installed, the product components meet the internal control standard, the impurity elements do not exceed the standard, and the main component strontium element also meets the internal control requirement.
TABLE 4 Al4Sr particle size and content of oxidized slag inclusions
After the flow groove flow stabilization platform is installed, the condition that the content of the oxide in the product exceeds the standard is avoided, the product quality is ensured, and the production of high-purity products is realized.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept, and these changes and modifications are all within the scope of the present invention.
Claims (4)
1. A preparation method of a high-purity aluminum-strontium intermediate alloy wire rod comprises the following steps:
(1) adding an aluminum ingot into an electric furnace, heating to 670-1200 ℃, melting an aluminum material into aluminum liquid in the electric furnace, adding a surface covering agent, refining the melt, and removing the surface scum after the refining is finished;
(2) pressing metal strontium into the aluminum liquid to melt the metal strontium, and preparing an aluminum ingot: the mass ratio of the metal strontium is 8-10: 1;
(3) cutting off the power, refining the melt, cleaning floating slag on the surface after finishing refining, and supplementing a covering agent;
(4) repeating the operations (2) and (3) until all the metal strontium is added;
(5) after the metal is added, the melt is heated to 780-1200 ℃ and then is cast;
(6) the casting liquid firstly flows through a flow groove provided with a steady flow table, then flows through a double-layer sleeve and finally flows into a die casting blank;
(7) and (4) extrusion molding.
2. The method of claim 1, wherein: the launder that is equipped with the stationary flow platform set up multiunit stationary flow platform at even interval in the launder, every stationary flow platform of group all includes keeps off the platform, keeps off the platform down, keeps off the crisscross interval setting of platform, the height that keeps off the platform on is 2.8 +/-1 cm, keeps off the height of platform down and is 4.6 +/-2 cm.
3. The method of claim 2, wherein: the launder with the steady flow platform keeps warm through the automatic heating system.
4. The method of claim 1, wherein: the double-layer sleeve pipe comprises an inner layer pipe and an outer layer pipe, wherein the inner layer pipe is a graphite pipe, the outer layer pipe is a stainless steel pipe, the outer layer pipe is 2-3 cm longer than the inner layer pipe, and an air inlet is formed in the outer layer pipe and connected with a nitrogen source.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113005315A (en) * | 2021-02-22 | 2021-06-22 | 中南大学 | Preparation method of efficient Al-10Sr intermediate alloy |
| CN115141945A (en) * | 2022-08-01 | 2022-10-04 | 立中四通轻合金集团股份有限公司 | Preparation method of aluminum-strontium intermediate alloy coiled material with strontium content of more than 10wt% |
Citations (1)
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| CN101519742A (en) * | 2008-06-30 | 2009-09-02 | 河北立中有色金属集团有限公司 | Formula and production process of aluminum-strontium intermediate alloy ingot |
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- 2019-12-23 CN CN201911335216.2A patent/CN111004935A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101519742A (en) * | 2008-06-30 | 2009-09-02 | 河北立中有色金属集团有限公司 | Formula and production process of aluminum-strontium intermediate alloy ingot |
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| 李红霞: "《现代冶金功能耐火材料》", 28 February 2019 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113005315A (en) * | 2021-02-22 | 2021-06-22 | 中南大学 | Preparation method of efficient Al-10Sr intermediate alloy |
| CN115141945A (en) * | 2022-08-01 | 2022-10-04 | 立中四通轻合金集团股份有限公司 | Preparation method of aluminum-strontium intermediate alloy coiled material with strontium content of more than 10wt% |
| CN115141945B (en) * | 2022-08-01 | 2023-10-31 | 立中四通轻合金集团股份有限公司 | Preparation method of aluminum-strontium intermediate alloy coiled material with strontium content being more than 10wt% |
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