CN104762534B - A kind of al-sr alloy alterant suitable for cast Al-Si alloy - Google Patents
A kind of al-sr alloy alterant suitable for cast Al-Si alloy Download PDFInfo
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- CN104762534B CN104762534B CN201510165559.4A CN201510165559A CN104762534B CN 104762534 B CN104762534 B CN 104762534B CN 201510165559 A CN201510165559 A CN 201510165559A CN 104762534 B CN104762534 B CN 104762534B
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Abstract
The invention discloses a kind of al-sr alloy alterant suitable for cast Al-Si alloy, its chemical composition is by weight percentage：Strontium 4 6%, silicon 5 7%, balance of aluminium.The al-sr alloy alterant of the present invention, low-alloyed smelting temperature can drop in the addition of silicon, the smelting temperature of al-sr alloy is reduced into 100 DEG C or so, smelting temperature can be reduced to 750 800 DEG C during production, 830 900 DEG C of the smelting temperature than producing aluminium strontium binary alloy is greatly reduced；The reduction of smelting temperature can reduce the high-temperature oxydation loss of strontium, improve the recovery rate of strontium, reduce the production cost of alterant, and have no effect on the rotten performance of al-sr alloy.
Description
Technical field
The invention belongs to alloy metal material technical field, specifically, the present invention relates to a kind of be applied to Casting Al-Si
The al-sr alloy alterant of alloy.
Background technology
Density is low, intensity is high, the low advantage of wear-resisting, heat-resist, thermal coefficient of expansion because having for cast Al-Si alloy, so
It is the operation strategies most maximum class alloy of wide, yield in cast aluminium alloy gold.But Alar is with the rising of silicone content, organize
It is middle a large amount of needle shaped eutectic silicons occur, or even there is thick polygonal block primary silicon, matrix has seriously been isolated, the machinery of alloy has been made
Performance is particularly plastic property and significantly reduces, and machinability deteriorates.Therefore, adopt Metamorphism treatment cast Al-Si alloy more,
Change the shape of silicon, size, but the cast Al-Si alloy for silicone content less than 6% is when carrying out deformation process, the mechanics of alloy
Performance change is not obvious, therefore Metamorphism treatment is mainly for the alusil alloy of silicon 6%.
The rotten of cast aluminium alloy gold has various, and wherein al-sr alloy is a kind of new and effective alterant, is widely used at present.
Compared with other alterants, the metamorphism time of al-sr alloy is long, sustainable 5～7 hours, not only without change excessively in metamorphic process
Matter behavior, and can remelting repeatedly, corrosion-free effect.Therefore al-sr alloy is applied generally in casting industry, is that aluminium is closed
A kind of important alterant of gold, particularly silicon aluminum alloy, the tissue that foundry goods can be improved and the mechanical performance for improving foundry goods.
The method for producing al-sr alloy can be divided into the method for mixing, thermal reduction and fused salt electrolysis process.Fused salt electrolysis process according to
Fused salt used is different, can be divided into electrolysis of fused chloride salt and fluoride molten salt electrolysis again.
It, to the method for mixing, is by two kinds or two to the method for mixing in electric arc furnaces or other high temperature furnaces that the production method of conventional alloy is
The metal for planting the above is formed to mixing in the molten state.As the fusing point of al-sr alloy is high, the temperature of al-sr alloy is produced to oozing method
Up to 900 DEG C of degree, the scaling loss of strontium are serious, loss ratio up to 20%～35%.Preparation of Metallic Strontium is a kind of very active alkaline earth gold
Category, between calcium and barium, producing for Preparation of Metallic Strontium adopts vacuum-thermal method to its chemism more, and equipment is complicated, technique bar
Part is strict, yields poorly, high cost, thus price is higher.So to the cost of the method for oozing as the scaling loss increase of strontium is a lot.
Alterant of the al-sr alloy as silumin alloy, is widely used in the casting of alusil alloy, and annual requirement is huge
Greatly.At present, the preparation method of al-sr alloy has various, but wide variety of in enterprise or to the method for oozing.
The content of the invention
The present invention provides a kind of al-sr alloy alterant suitable for cast Al-Si alloy, it is therefore an objective to be intended to not affect aluminium strontium
Under the premise of the rotten performance of alloy, loss and the cost of strontium element are reduced.
To achieve these goals, the technical scheme taken of the present invention is：Suitable for the al-sr alloy of cast Al-Si alloy
Alterant, its chemical composition is by weight percentage：Strontium 9-11%, silicon 5-7%, balance of aluminium.
Suitable for the chemical composition of the al-sr alloy alterant of cast Al-Si alloy it is by weight percentage：Strontium 10%,
Silicon 6%, remaining is aluminium.
Low-alloyed smelting temperature can drop in the al-sr alloy alterant of the present invention, the addition of silicon, by the molten of al-sr alloy
Refining temperature reduces by 100 DEG C or so, and during production, smelting temperature can be reduced to 750-800 DEG C, than producing the molten of aluminium strontium binary alloy
Refining temperature 830-900 DEG C is greatly reduced；The reduction of smelting temperature can reduce the high-temperature oxydation loss of strontium, improve receiving for strontium
Rate, the price of strontium is at 50,000 yuan per ton or so, therefore reduces the production cost of alterant, and has no effect on al-sr alloy
Rotten performance.
Description of the drawings
This specification includes the following drawings, and shown content is respectively：
Fig. 1 is the preparation technology flow chart of al-sr alloy alterant of the present invention；
Fig. 2 is al-sr alloy modification effect metallograph of the present invention；
Specific embodiment
Below against accompanying drawing, by the description to embodiment, further details of is made to the specific embodiment of the present invention
Explanation, it is therefore an objective to help those skilled in the art to have more complete, accurate and deep reason to design of the invention, technical scheme
Solution, and contribute to its enforcement.
The invention provides a kind of al-sr alloy alterant suitable for cast Al-Si alloy, its chemical composition by weight hundred
Divide than meter：Strontium 9-11%, silicon 5-7%, balance of aluminium.
Low-alloyed smelting temperature can drop in this al-sr alloy alterant, the addition of silicon, by the smelting temperature of al-sr alloy
Reduce by 100 DEG C or so so that smelting temperature can be reduced to 750-800 DEG C during production, middle aluminium strontium two-spot is closed compared to existing technology
For 830-900 DEG C of the smelting temperature of gold, the smelting temperature of al-sr alloy alterant is greatly reduced.The reduction of smelting temperature can
To reduce the high-temperature oxydation loss of strontium, the recovery rate of strontium is improved, the price of strontium is at 50,000 yuan per ton or so, therefore reduces rotten
The production cost of agent.
In the aluminium strontium silicon alloy of the present invention, the presence of strontium is mainly with Al4Sr, Al2Sr phase, it is to avoid in traditional al-sr alloy
Eutectic phase, its modification effect more preferably, melt faster, reduce incubation period.
Present invention also offers a kind of preparation technology of the al-sr alloy alterant suitable for cast Al-Si alloy, such as Fig. 1
Shown, which comprises the steps：
(1) burden process；
According to percentage by weight：Strontium 9-11%, silicon 5-7%, balance of aluminium, weigh alusil alloy powder and strontium powder；
(2) melting operation；
Alusil alloy is melted, fusion temperature is preferably 750 DEG C, simultaneously slag making slagging-off after dissolving obtains clean aluminium silicon and melts
Liquid；
(3) aluminium silicon melt cleaning procedure；
Add without sodium slag-cleaning agent to aluminium melted silicon, the slag in aluminium melted silicon is removed after being sufficiently stirred for, to reach to aluminium silicon
The purpose purified by liquation；
(4) argon gas protection operation；
After purified treatment, argon gas is sprayed to into aluminium melted silicon surface, gas shield is carried out to aluminium melted silicon, completely cut off aluminium melted silicon
With the contact of oxygen in air, to reduce the oxidizing gas on aluminium melted silicon surface, the strontium element for being easy to oxidation is made to receive guarantor
Shield, reduces generation field trash, the probability of adsorbed gas；
(5) add Strontium Alloying operation；
After gas shield is processed, strontium powder is added in batches in aluminium melted silicon, then heating fusing, form aluminium silicon strontium and melt
Liquid；
(6) refining procedure；
Argon gas is passed through in aluminium silicon strontium liquation carries out refining treatment, the gas and field trash in processing procedure aluminium silicon strontium solution
Fully float, remove the gas and field trash in aluminium silicon strontium liquation, to reduce the content of the gas and field trash of product；
(7) Standing operation；
Aluminium silicon strontium solution is carried out into stewing process for a period of time, is made the impurity in solution fully float, is finally removed impurity,
Make the composition of aluminium silicon strontium solution more uniform.
As preferred, in step (3), need to add account for gross weight 1.5 ‰ without sodium slag-cleaning agent, and after being sufficiently stirred for will
Slag treatment is clean.
As preferred, in step (5), in four batches strontium powder need to be added in aluminium melted silicon, first adds inventory
40%, second batch add heat inventory 30%, the 3rd batch addition heat inventory 20%, the 4th batch add heat throw
The 10% of doses.
As preferred, in step (5), each batch adds time interval 3-6 minute, plus the control of strontium process temperature to exist
750-800℃。
As preferred, in step (5), add after quantitative strontium powder, using ultrasonic agitation device to aluminium melted silicon every time
Solution is stirred.Ultrasonic agitation device as well known in the skilled person, possesses stirring and ultrasonic wave is produced
Raw function, ultrasonic wave has cavitation effect, in ultrasonic delivery to melt, can stir the aluminium in melt and strontium element composition
Mix, obtain uniform organizing.
As preferred, in step (6), refining finish after, to aluminium silicon strontium liquation stir 10-20 minutes, make alloy into
Divide homogenization.
This preparation technology also includes the steps：
(8) casting process；
After stewing process, cast aluminum silicon strontium liquation, cast temperature are controlled at 800 DEG C, form block al-sr alloy foundry goods；
(9) detect operation；
Cast；
(10) modification effect detection operation；
When the aluminum solutions melting of aluminium alloy castings is incubated, polylith al-sr alloy foundry goods is added and is gone bad in holding furnace
Process；After the completion of rotten, the composition of the rotten aluminium alloy of sampling detection.
In the composition detection result of rotten aluminium alloy, content of strontium is 0.012%, and silicone content improves 0.015%, in aluminium alloy
The change of these silicone contents in foundry goods can't affect the performance of foundry goods.Content of strontium is 0.012%, meets the strontium of aluminium alloy castings
Content requirement, the metallograph of modification effect as illustrated, fine microstructures are uniform, as shown in Figure 2.
The electrolytic aluminium in traditional handicraft is substituted using alusil alloy in the preparation technology of the present invention, fusion temperature can be dropped
It is low, and alloying temperature is reduced, 750-800 DEG C of the alloying temperature of the aluminium silicon strontium of the present invention, traditional al-sr alloyization temperature
Degree is at 850-900 DEG C or so.On the one hand smelting temperature can reduce energy resource consumption with the reduction of alloying temperature, on the other hand may be used
To reduce the scaling loss of strontium element.Stirred using ultrasonic wave in technique, both fully alloying component can stir, again can be with
Using the local pore cavitation and moment pore hot-spot of ultrasonic wave, overheated phase Al4Sr and Al2Sr phases are obtained, these mutually may be used
Further more effectively to be refined to the phase constitution of cast aluminium alloy gold, the metallographic structure less than 80 μm is obtained, as shown in Figure 2.
Protected using argon gas in technique, reduce alloy and contact with oxidizing gas, be effectively protected.
Embodiment one
The chemical composition of the al-sr alloy alterant of the present embodiment is by weight percentage：Strontium 10%, silicon 6%, remaining
For aluminium, made by alterant be AlSr10.
The preparation technology of the al-sr alloy alterant of the present embodiment comprises the steps：
(1) burden process；
According to percentage by weight：Strontium 10%, silicon 6%, balance of aluminium, weigh alusil alloy powder and strontium powder；
(2) melting operation；
Alusil alloy is melted, fusion temperature is preferably 750 DEG C, simultaneously slag making slagging-off after dissolving obtains clean aluminium silicon and melts
Liquid；
(3) aluminium silicon melt cleaning procedure；
Add to aluminium melted silicon account for gross weight 1.5 ‰ without sodium slag-cleaning agent, remove after being sufficiently stirred for molten in aluminium melted silicon
Slag, to reach the purpose purified to aluminium melted silicon；
(4) argon gas protection operation；
After purified treatment, argon gas is sprayed to into aluminium melted silicon surface, gas shield is carried out to aluminium melted silicon, completely cut off aluminium melted silicon
With the contact of oxygen in air, to reduce the oxidizing gas on aluminium melted silicon surface, the strontium element for being easy to oxidation is made to receive guarantor
Shield, reduces generation field trash, the probability of adsorbed gas；
(5) add Strontium Alloying operation；
After gas shield is processed, in four batches strontium powder is added in aluminium melted silicon, the 40% of first addition inventory, second
Criticize and add the 30% of heat inventory, the 20% of the 3rd batch of addition heat inventory, the 10% of the 4th batch of addition heat inventory；
Each batch adds time interval 4 minutes, adds heating fusing after strontium powder, plus strontium process temperature to control at 750 DEG C；Every time to aluminium silicon
After liquation adds quantitative strontium powder, and solution is stirred using ultrasonic agitation device, eventually forms aluminium silicon strontium liquation；
(6) refining procedure；
Argon gas is passed through in aluminium silicon strontium liquation carries out refining treatment, the gas and field trash in processing procedure aluminium silicon strontium solution
Fully float, remove the gas and field trash in aluminium silicon strontium liquation, to reduce the content of the gas and field trash of product；Refine
Bi Hou, and 10-20 minutes are stirred to aluminium silicon strontium liquation, homogenize alloying component；
(7) Standing operation；
Aluminium silicon strontium solution is carried out into stewing process for a period of time, is made the impurity in solution fully float, is finally removed impurity,
Make the composition of aluminium silicon strontium solution more uniform；
(8) casting process；
After stewing process, cast aluminum silicon strontium liquation, cast temperature are controlled at 800 DEG C, form block al-sr alloy foundry goods；
(9) detect operation；
Cast；
(10) modification effect detection operation；
When the aluminum solutions melting of aluminium alloy castings is incubated, polylith al-sr alloy foundry goods is added and is gone bad in holding furnace
Process；After the completion of rotten, the composition of the rotten aluminium alloy of sampling detection.
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%, its
It is remaining for aluminium.
The preparation technology of the al-sr alloy alterant of the present embodiment comprises the steps：
(1) burden process；
According to percentage by weight：Strontium 9.5%, silicon 6.5%, balance of aluminium, weigh alusil alloy powder and strontium powder；
(2) melting operation；
Alusil alloy is melted, fusion temperature is preferably 750 DEG C, simultaneously slag making slagging-off after dissolving obtains clean aluminium silicon and melts
Liquid；
(3) aluminium silicon melt cleaning procedure；
Add to aluminium melted silicon account for gross weight 1.5 ‰ without sodium slag-cleaning agent, remove after being sufficiently stirred for molten in aluminium melted silicon
Slag, to reach the purpose purified to aluminium melted silicon；
(4) argon gas protection operation；
After purified treatment, argon gas is sprayed to into aluminium melted silicon surface, gas shield is carried out to aluminium melted silicon, completely cut off aluminium melted silicon
With the contact of oxygen in air, to reduce the oxidizing gas on aluminium melted silicon surface, the strontium element for being easy to oxidation is made to receive guarantor
Shield, reduces generation field trash, the probability of adsorbed gas；
(5) add Strontium Alloying operation；
After gas shield is processed, in four batches strontium powder is added in aluminium melted silicon, the 40% of first addition inventory, second
Criticize and add the 30% of heat inventory, the 20% of the 3rd batch of addition heat inventory, the 10% of the 4th batch of addition heat inventory；
Each batch adds time interval 5 minutes, adds heating fusing after strontium powder, plus strontium process temperature to control at 800 DEG C；Every time to aluminium silicon
After liquation adds quantitative strontium powder, and solution is stirred using ultrasonic agitation device, eventually forms aluminium silicon strontium liquation；
(6) refining procedure；
Argon gas is passed through in aluminium silicon strontium liquation carries out refining treatment, the gas and field trash in processing procedure aluminium silicon strontium solution
Fully float, remove the gas and field trash in aluminium silicon strontium liquation, to reduce the content of the gas and field trash of product；Refine
Bi Hou, and 10-20 minutes are stirred to aluminium silicon strontium liquation, homogenize alloying component；
(7) Standing operation；
Aluminium silicon strontium solution is carried out into stewing process for a period of time, is made the impurity in solution fully float, is finally removed impurity,
Make the composition of aluminium silicon strontium solution more uniform；
(8) casting process；
After stewing process, cast aluminum silicon strontium liquation, cast temperature are controlled at 800 DEG C, form block al-sr alloy foundry goods；
(9) detect operation；
Cast；
(10) modification effect detection operation；
When the aluminum solutions melting of aluminium alloy castings is incubated, polylith al-sr alloy foundry goods is added and is gone bad in holding furnace
Process；After the completion of rotten, the composition of the rotten aluminium alloy of sampling detection.
The present invention is exemplarily described above in association with accompanying drawing.Obviously, the present invention is implemented
The restriction of formula.As long as employ the improvement of the various unsubstantialities that method of the present invention design and technical scheme are carried out；Or not
It is improved, the above-mentioned design of the present invention and technical scheme are directly applied to into other occasions, in protection scope of the present invention
Within.
Claims (1)
1. a kind of al-sr alloy alterant suitable for cast Al-Si alloy, it is characterised in that its chemical composition percentage by weight
Than meter：Strontium 9%, silicon 5%, balance of aluminium；
The preparation technology of al-sr alloy alterant includes step：
(1) burden process；
According to percentage by weight：Strontium 9%, silicon 5%, balance of aluminium, weigh alusil alloy powder and strontium powder；
(2) melting operation；
Alusil alloy is melted, aluminium melted silicon is obtained；
(3) aluminium silicon melt cleaning procedure；
Add without sodium slag-cleaning agent to aluminium melted silicon, remove the slag in aluminium melted silicon；
(4) argon gas protection operation；
After purified treatment, argon gas is sprayed to into aluminium melted silicon surface；
(5) add Strontium Alloying operation；
After gas shield is processed, strontium powder is added in batches in aluminium melted silicon, then heating fusing, form aluminium silicon strontium liquation；
(6) refining procedure；
Argon gas is passed through in aluminium silicon strontium liquation carries out refining treatment, removes the gas in aluminium silicon strontium liquation and is mingled with；
(7) Standing operation；
Aluminium silicon strontium liquation is carried out into stewing process, the impurity floating in liquation is made, is finally removed impurity.
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| CA1064736A (en) * | 1975-06-11 | 1979-10-23 | Robert D. Sturdevant | Strontium-bearing master composition for 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 |
| CN104294110B (en) * | 2014-10-11 | 2016-07-20 | 江苏大学 | A kind of process that can improve polynary hypoeutectic al-si alloy mechanical property |
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