CN104762534A - Aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy - Google Patents
Aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy Download PDFInfo
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- CN104762534A CN104762534A CN201510165559.4A CN201510165559A CN104762534A CN 104762534 A CN104762534 A CN 104762534A CN 201510165559 A CN201510165559 A CN 201510165559A CN 104762534 A CN104762534 A CN 104762534A
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Abstract
The invention discloses an aluminum-strontium alloy modifier suitable for casting aluminum-silicon alloy. The aluminum-strontium alloy modifier comprises the following chemical components in percentage by weight: 4%-6% of strontium, 5%-7% of silicon and the balance of aluminum. According to the aluminum-strontium alloy modifier, due to the addition of silicon, the melting temperature of the alloy can be reduced; the melting temperature of aluminum-strontium alloy can be reduced by about 100 DEG C; the melting temperature during production can be reduced to 750-800 DEG C, and is greatly reduced in comparison with the melting temperature of 830-900 DEG C when aluminum-strontium binary alloy is produced; due to the reduction of the melting temperature, high-temperature oxidation loss of strontium can be reduced; the yield of the strontium is improved; the production cost of the modifier is reduced; and the deterioration property of the aluminum-strontium alloy is not affected.
Description
Technical field
The invention belongs to alloy metal material technical field, specifically, the present invention relates to a kind of al-sr alloy alterant being applicable to cast Al-Si alloy.
Background technology
The advantages such as density is low, intensity is high because having for cast Al-Si alloy, wear-resisting, good heat resistance, thermal expansivity are low, so the class alloy being in cast aluminium alloy, operation strategies is the widest, output is maximum.But Alar is with the rising of silicone content, in tissue, there is a large amount of needle shaped eutectic silicon, even occur thick polygonal block primary silicon, seriously isolated matrix, make the mechanical property of alloy particularly plastic property significantly reduce, machinability worsen.Therefore, cast Al-Si alloy many employings Metamorphism treatment, changes shape, the size of silicon, but when deformation process is carried out for the cast Al-Si alloy that silicone content is less than 6%, the mechanical property of alloy changes not obvious, and therefore Metamorphism treatment is mainly for the aluminum silicon alloy of silicon 6%.
Cast aluminium alloy rotten has multiple, and wherein al-sr alloy is a kind of new and effective alterant, is widely used at present.Compare with other alterant, the metamorphism time of al-sr alloy is long, sustainable 5 ~ 7 hours, not only without crossing rotten behavior in metamorphic process, and can remelting repeatedly, corrosion-free effect.Therefore al-sr alloy is applied generally in casting industry, is aluminium alloy, particularly the important alterant of the one of silicon aluminum alloy, can improve the tissue of foundry goods and improve the mechanical property of foundry goods.
The method producing al-sr alloy can be divided into the method for mixing, hot reducing method and fused salt electrolysis process.Fused salt electrolysis process is different according to fused salt used, can be divided into again electrolysis of fused chloride salt and fluoride molten salt electrolysis.
The production method of conventional alloy is to the method for mixing, and is formed mixing in the molten state by two or more metal in electric arc furnace or other High Temperature Furnaces Heating Apparatus to the method for mixing.Because the fusing point of al-sr alloy is high, to the temperatures as high 900 DEG C oozing method production al-sr alloy, the scaling loss of strontium is serious, and loss ratio is up to 20% ~ 35%.Preparation of Metallic Strontium is a kind of very active alkaline-earth metal, and its chemically reactive is between calcium and barium, and producing of Preparation of Metallic Strontium adopts vacuum-thermal method more, and equipment is complicated, and processing condition are strict, and yield poorly, cost is high, and thus price is higher.Like this to the cost of the method for oozing because the scaling loss of strontium increases a lot.
Al-sr alloy is as the alterant of silumin alloy, and be widely used in the casting of aluminum silicon alloy, annual requirement is huge.At present, the preparation method of al-sr alloy has multiple, but in enterprise, widespread use still to the method for oozing.
Summary of the invention
The invention provides a kind of al-sr alloy alterant being applicable to cast Al-Si alloy, under object is intended to not affect the rotten performance prerequisite of al-sr alloy, reduce loss and the cost of strontium element.
To achieve these goals, the technical scheme that the present invention takes is: the al-sr alloy alterant being applicable to cast Al-Si alloy, its chemical composition by weight percentage: strontium 9-11%, silicon 5-7%, surplus is aluminium.
The chemical composition being applicable to the al-sr alloy alterant of cast Al-Si alloy is by weight percentage: strontium 10%, silicon 6%, and all the other are aluminium.
Al-sr alloy alterant of the present invention, low-alloyed smelting temperature can fall in adding of silicon, the smelting temperature of al-sr alloy is reduced about 100 DEG C, and during production, smelting temperature can be reduced to 750-800 DEG C, greatly reduces than the smelting temperature 830-900 DEG C producing aluminium strontium binary alloy; The reduction of smelting temperature can reduce the high temperature oxidation loss of strontium, and improve the recovery rate of strontium, the price of strontium, at about 50,000 yuan per ton, because this reducing the production cost of alterant, and does not affect the rotten performance of al-sr alloy.
Accompanying drawing explanation
This specification sheets comprises the following drawings, shown content respectively:
Fig. 1 is preparation technology's schema of al-sr alloy alterant of the present invention;
Fig. 2 is al-sr alloy modification effect metallograph of the present invention;
Embodiment
Contrast accompanying drawing below, by the description to embodiment, be described in further detail the specific embodiment of the present invention, object helps those skilled in the art to have more complete, accurate and deep understanding to design of the present invention, technical scheme, and contribute to its enforcement.
The invention provides a kind of al-sr alloy alterant being applicable to cast Al-Si alloy, its chemical composition by weight percentage: strontium 9-11%, silicon 5-7%, surplus is aluminium.
This al-sr alloy alterant, low-alloyed smelting temperature can fall in adding of silicon, the smelting temperature of al-sr alloy is reduced about 100 DEG C, when making to produce, smelting temperature can be reduced to 750-800 DEG C, the smelting temperature 830-900 DEG C of middle aluminium strontium binary alloy compared to existing technology, the smelting temperature of al-sr alloy alterant greatly reduces.The reduction of smelting temperature can reduce the high temperature oxidation loss of strontium, improves the recovery rate of strontium, the price of strontium at about 50,000 yuan per ton, because this reducing the production cost of alterant.
In aluminium strontium silicon alloy of the present invention, the existence of strontium, mainly with Al4Sr, Al2Sr phase, avoids eutectic phase in conventional aluminum strontium alloy, and its modification effect is better, melts faster, reduces latent period.
Present invention also offers a kind of preparation technology being applicable to the al-sr alloy alterant of cast Al-Si alloy, as shown in Figure 1, it comprises the steps:
(1) burden process;
According to weight percent: strontium 9-11%, silicon 5-7%, surplus are aluminium, take aluminum silicon alloy powder and strontium powder;
(2) melting operation;
Melted by aluminum silicon alloy, temperature of fusion is preferably 750 DEG C, and after dissolving, also slag making slagging-off, obtains clean aluminium melted silicon;
(3) aluminium silicon melt cleaning section;
Add without sodium slag-cleaning agent to aluminium melted silicon, remove the slag in aluminium melted silicon after fully stirring, to reach the object purified aluminium melted silicon;
(4) argon shield operation;
After purifying treatment, argon gas is sprayed to aluminium melted silicon surface, gas shield is carried out to aluminium melted silicon, completely cut off the contact of oxygen in aluminium melted silicon and air, to reduce the oxidizing gas on aluminium melted silicon surface, make the strontium element of as easy as rolling off a log oxidation receive protection, decrease the probability producing inclusion, adsorbed gas;
(5) Strontium Alloying operation is added;
After gas shield process, in aluminium melted silicon, add strontium powder in batches, then heat fused, form aluminium silicon strontium liquation;
(6) refining procedure;
In aluminium silicon strontium liquation, pass into argon gas carry out refining treatment, the gas in treating processes aluminium silicon strontium solution and inclusion fully float, and remove the gas in aluminium silicon strontium liquation and inclusion, with the content of the gas and inclusion that reduce product;
(7) operation is left standstill;
Aluminium silicon strontium solution is carried out leave standstill process for some time, the impurity in solution is fully floated, last removal of contamination, make the composition of aluminium silicon strontium solution more even.
As preferably, in step (3), need add account for gross weight 1.5 ‰ without sodium slag-cleaning agent, and after fully stirring, slag treatment is clean.
As preferably, in step (5), need in four batches strontium powder be added in aluminium melted silicon, first adds 40% of charging capacity, second batch adds 30% of heat charging capacity, and the 3rd batch of the 20%, four batch of adding heat charging capacity adds 10% of heat charging capacity.
As preferably, in step (5), each batch of joining day interval 3-6 minute, adds strontium process temperature and controls at 750-800 DEG C.
As preferably, in step (5), after adding quantitative strontium powder to aluminium melted silicon, use ultrasonic agitation device to stir solution at every turn.As well known in the skilled person, possess stirring and ultrasonic wave generation function, ultrasonic wave has cavitation effect to ultrasonic agitation device, and the aluminium in melt and strontium element composition, in melt, can stir, obtain and organize uniformly by ultrasonic delivery.
As preferably, in step (6), after refining, 10-20 minute is stirred to aluminium silicon strontium liquation, makes alloying constituent homogenizing.
This preparation technology also comprises following step:
(8) casting operation;
After leaving standstill process, cast aluminum silicon strontium liquation, pouring temperature controls at 800 DEG C, forms block al-sr alloy foundry goods;
(9) operation is detected;
After casting, the composition of al-sr alloy foundry goods is detected;
(10) modification effect detects operation;
When the aluminum solutions melting insulation of aluminum alloy casting, polylith al-sr alloy foundry goods is added in holding furnace and carries out Metamorphism treatment; After having gone bad, sampling has detected the composition of rotten aluminium alloy.
In the composition detection result of rotten aluminium alloy, content of strontium is 0.012%, and silicone content improves 0.015%, and in aluminum alloy casting, the change of these silicone contents can't affect the performance of foundry goods.Content of strontium is 0.012%, meets the content of strontium requirement of aluminum alloy casting, and as shown in the figure, fine microstructures is even, as shown in Figure 2 for the metallograph of modification effect.
Aluminum silicon alloy is adopted to substitute electrolytic aluminum in traditional technology in preparation technology of the present invention, temperature of fusion can be reduced, and reduce alloying temperature, the alloying temperature 750-800 DEG C of aluminium silicon strontium of the present invention, traditional al-sr alloy temperature is at about 850-900 DEG C.The reduction of smelting temperature and alloying temperature can reduce energy consumption on the one hand, can reduce the scaling loss of strontium element on the other hand.Ultrasonic stirring is adopted in technique, both can fully alloying constituent be stirred, hyperacoustic local pore cavitation and moment pore local superheating can be adopted again, obtain overheated phase Al4Sr and Al2Sr phase, these phases can carry out more effective refinement to the phase constitution of cast aluminium alloy further, obtain the metallographic structure being less than 80 μm, as shown in Figure 2.Adopt argon gas protection in technique, reduce alloy and contact with oxidizing gas, obtain and effectively protect.
Embodiment one
The chemical composition of the al-sr alloy alterant of the present embodiment is by weight percentage: strontium 10%, silicon 6%, and all the other are aluminium, and the alterant made is AlSr10.
The preparation technology of the al-sr alloy alterant of the present embodiment comprises the steps:
(1) burden process;
According to weight percent: strontium 10%, silicon 6%, surplus are aluminium, take aluminum silicon alloy powder and strontium powder;
(2) melting operation;
Melted by aluminum silicon alloy, temperature of fusion is preferably 750 DEG C, and after dissolving, also slag making slagging-off, obtains clean aluminium melted silicon;
(3) aluminium silicon melt cleaning section;
To aluminium melted silicon add account for gross weight 1.5 ‰ without sodium slag-cleaning agent, remove the slag in aluminium melted silicon after fully stirring, to reach the object purified aluminium melted silicon;
(4) argon shield operation;
After purifying treatment, argon gas is sprayed to aluminium melted silicon surface, gas shield is carried out to aluminium melted silicon, completely cut off the contact of oxygen in aluminium melted silicon and air, to reduce the oxidizing gas on aluminium melted silicon surface, make the strontium element of as easy as rolling off a log oxidation receive protection, decrease the probability producing inclusion, adsorbed gas;
(5) Strontium Alloying operation is added;
After gas shield process, add in aluminium melted silicon by strontium powder in four batches, first adds 40% of charging capacity, and second batch adds 30% of heat charging capacity, and the 3rd batch of the 20%, four batch of adding heat charging capacity adds 10% of heat charging capacity; 4 minutes, each batch of joining day interval, adds the fusing of strontium powder post-heating, adds strontium process temperature and control at 750 DEG C; After adding quantitative strontium powder to aluminium melted silicon, and use ultrasonic agitation device to stir solution at every turn, finally form aluminium silicon strontium liquation;
(6) refining procedure;
In aluminium silicon strontium liquation, pass into argon gas carry out refining treatment, the gas in treating processes aluminium silicon strontium solution and inclusion fully float, and remove the gas in aluminium silicon strontium liquation and inclusion, with the content of the gas and inclusion that reduce product; After refining, and 10-20 minute is stirred to aluminium silicon strontium liquation, make alloying constituent homogenizing;
(7) operation is left standstill;
Aluminium silicon strontium solution is carried out leave standstill process for some time, the impurity in solution is fully floated, last removal of contamination, make the composition of aluminium silicon strontium solution more even;
(8) casting operation;
After leaving standstill process, cast aluminum silicon strontium liquation, pouring temperature controls at 800 DEG C, forms block al-sr alloy foundry goods;
(9) operation is detected;
After casting, the composition of al-sr alloy foundry goods is detected;
(10) modification effect detects operation;
When the aluminum solutions melting insulation of aluminum alloy casting, polylith al-sr alloy foundry goods is added in holding furnace and carries out Metamorphism treatment; After having gone bad, sampling has detected the composition of rotten aluminium alloy.
Embodiment two
The chemical composition of the al-sr alloy alterant of the present embodiment is by weight percentage: strontium 9.5%, silicon 6.5%, and all the other are aluminium.
The preparation technology of the al-sr alloy alterant of the present embodiment comprises the steps:
(1) burden process;
According to weight percent: strontium 9.5%, silicon 6.5%, surplus are aluminium, take aluminum silicon alloy powder and strontium powder;
(2) melting operation;
Melted by aluminum silicon alloy, temperature of fusion is preferably 750 DEG C, and after dissolving, also slag making slagging-off, obtains clean aluminium melted silicon;
(3) aluminium silicon melt cleaning section;
To aluminium melted silicon add account for gross weight 1.5 ‰ without sodium slag-cleaning agent, remove the slag in aluminium melted silicon after fully stirring, to reach the object purified aluminium melted silicon;
(4) argon shield operation;
After purifying treatment, argon gas is sprayed to aluminium melted silicon surface, gas shield is carried out to aluminium melted silicon, completely cut off the contact of oxygen in aluminium melted silicon and air, to reduce the oxidizing gas on aluminium melted silicon surface, make the strontium element of as easy as rolling off a log oxidation receive protection, decrease the probability producing inclusion, adsorbed gas;
(5) Strontium Alloying operation is added;
After gas shield process, add in aluminium melted silicon by strontium powder in four batches, first adds 40% of charging capacity, and second batch adds 30% of heat charging capacity, and the 3rd batch of the 20%, four batch of adding heat charging capacity adds 10% of heat charging capacity; 5 minutes, each batch of joining day interval, adds the fusing of strontium powder post-heating, adds strontium process temperature and control at 800 DEG C; After adding quantitative strontium powder to aluminium melted silicon, and use ultrasonic agitation device to stir solution at every turn, finally form aluminium silicon strontium liquation;
(6) refining procedure;
In aluminium silicon strontium liquation, pass into argon gas carry out refining treatment, the gas in treating processes aluminium silicon strontium solution and inclusion fully float, and remove the gas in aluminium silicon strontium liquation and inclusion, with the content of the gas and inclusion that reduce product; After refining, and 10-20 minute is stirred to aluminium silicon strontium liquation, make alloying constituent homogenizing;
(7) operation is left standstill;
Aluminium silicon strontium solution is carried out leave standstill process for some time, the impurity in solution is fully floated, last removal of contamination, make the composition of aluminium silicon strontium solution more even;
(8) casting operation;
After leaving standstill process, cast aluminum silicon strontium liquation, pouring temperature controls at 800 DEG C, forms block al-sr alloy foundry goods;
(9) operation is detected;
After casting, the composition of al-sr alloy foundry goods is detected;
(10) modification effect detects operation;
When the aluminum solutions melting insulation of aluminum alloy casting, polylith al-sr alloy foundry goods is added in holding furnace and carries out Metamorphism treatment; After having gone bad, sampling has detected the composition of rotten aluminium alloy.
Below by reference to the accompanying drawings to invention has been exemplary description.Obviously, specific implementation of the present invention is not subject to the restrictions described above.As long as have employed the improvement of the various unsubstantialities that method of the present invention is conceived and technical scheme is carried out; Or without improvement, above-mentioned design of the present invention and technical scheme directly applied to other occasion, all within protection scope of the present invention.
Claims (2)
1. be applicable to an al-sr alloy alterant for cast Al-Si alloy, it is characterized in that, its chemical composition by weight percentage: strontium 9-11%, silicon 5-7%, surplus is aluminium.
2. the al-sr alloy alterant being applicable to cast Al-Si alloy according to claim 1, is characterized in that, its chemical composition by weight percentage: strontium 10%, silicon 6%, all the other are aluminium.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148769A (en) * | 2016-07-26 | 2016-11-23 | 西安科技大学 | A kind of Al-Sr serial alloy bar and preparation technology thereof |
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| CN104294110A (en) * | 2014-10-11 | 2015-01-21 | 江苏大学 | Technique capable of improving mechanical property of multi-element hypoeutectic aluminum-silicon alloy |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US4108646A (en) * | 1975-06-11 | 1978-08-22 | Kawecki Berylco Industries, Inc. | Strontium-bearing master composition for addition to eutectic and hypo-eutectic silicon-aluminum casting alloys |
| US4185999A (en) * | 1978-05-31 | 1980-01-29 | Union Carbide Corporation | Barium-strontium-silicon-aluminum master alloy |
| JPS59162241A (en) * | 1983-03-07 | 1984-09-13 | Japan Metals & Chem Co Ltd | Sr-al mother alloy for modifying al-si alloy and its manufacture |
| CN104294110A (en) * | 2014-10-11 | 2015-01-21 | 江苏大学 | Technique capable of improving mechanical property of multi-element hypoeutectic aluminum-silicon alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106148769A (en) * | 2016-07-26 | 2016-11-23 | 西安科技大学 | A kind of Al-Sr serial alloy bar and preparation technology thereof |
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