CN105568076B - A kind of high-purity AlSi14A alloys and its preparation process - Google Patents
A kind of high-purity AlSi14A alloys and its preparation process Download PDFInfo
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- CN105568076B CN105568076B CN201510996227.0A CN201510996227A CN105568076B CN 105568076 B CN105568076 B CN 105568076B CN 201510996227 A CN201510996227 A CN 201510996227A CN 105568076 B CN105568076 B CN 105568076B
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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
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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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- 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
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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Abstract
The invention discloses a kind of preparation processes of high-purity AlSi14A alloys, raw material is made of 4N refined aluminiums ingot and 4N fine aluminum liquids and industrial silicon, first it is proportionally added into 60% 4N refined aluminium ingots, heating fusing, industrial silicon is layered on aluminium melt surface again, after silicon fusing completely, the 4N fine aluminum liquids for adding 40% are bedded in industrial silicon face, the abundant fusing for ensureing industrial silicon, is then adequately stirred；After being sufficiently stirred, refining agent is added, and control temperature is refined at 710 730 DEG C, surface slag is removed totally after refining, stood；Refined alloy liquid is cast.Preparation process of the present invention changes traditional raw material addition manner, in raw material adding procedure, a part of 4N refined aluminiums ingot is first added, heating fusing, industrial silicon is layered on aluminium melt surface again when melt temperature reaches 800 DEG C, it adds a part of 4N fine aluminum liquids and is bedded in industrial silicon face, ensure the abundant fusing of industrial silicon, ensure the uniformity of Si elements.
Description
Technical field
The present invention relates to a kind of high-purity AlSi14A alloys and its preparation processes, belong to aluminum alloy materials field.
Background technology
Alusil alloy is a kind of using aluminium, silicon as the forging of principal component and casting alloy.A small amount of copper, iron, nickel is added simultaneously can
To improve intensity, when silicone content is relatively low, the ductility of alusil alloy is preferable, is commonly used to do wrought aluminium alloy；When silicone content is higher
（Such as 7%）, the fillibility of Al-Si alloy melt is preferable, is commonly used to do casting alloy.It is more than Al-Si eutectic points in silicon content
（Si12.6%）Alusil alloy in, when silicon particle content is up to 14.5%-25%, add the elements such as a certain amount of Ni, Cu, Mg
Its comprehensive performance can be improved.
The Al-Si alloys that Si contents are 12.5% generate binary eutectic reaction when being cooled to certain temperature.Si contents >=
Primary silicon in 12.5% Hypereutectic Al-Si Alloy tissue is in coarse polygonal blocky or lath-shaped, and alloy strength is low, plasticity
Difference.But it is organized to be gone bad, is refined using certain technique, primary silicon and Eutectic Silicon in Al-Si Cast Alloys can be made to be changed as dividing on soft base body
Many Hard Inclusions that cloth, significantly improve the wearability of Hypereutectic Al-Si Alloy.It is excessively total simultaneously compared with eutectic Al-Si alloy
Brilliant Al-Si alloys also have coefficient of thermal expansion is small, density is small, the characteristic of good corrosion resistance, at present as produce piston original
Material is widely used in the piston production of automobile, motorcycle.
Past generally all uses the homemade mode of production using hypereutectic and hypoeutectic Al-Si aluminium alloy ingots producer, but
As the requirement to material property is higher and higher, the Hypereutectic Al-Si Alloy advantage of high-purity is more and more prominent.Therefore, it develops
High-purity Hypereutectic Al-Si Alloy ingot, it is extremely urgent.
The production technology scheme of traditional AlSi alloys：1, by the molten oven door opening for protecting stove, industrial silicon is added in stove, is sent
Natural gas is toasted, and at 690-720 DEG C, baking time is not less than 30 minutes for baking temperature control；2, industrial silicon toasts 30 points
By customer requirement ingredient by required general aluminium and crucible ingot elder generation fed to boiler after clock, then according to client's composition requirements addition aluminum bronze,
Manganese intermediate alloy.3, it after various alloying element materials enter stove, is warming up to 780-820 DEG C and keeps the temperature 2 hours, a certain amount of drop is then added
Warm ingot, then stirs molten aluminum 10-20 minutes, and material is made to be completely melt.Temperature of aluminum liquid control is between 710 DEG C~730 DEG C in stove.
4, add a certain amount of cooling aluminium before refining, Al-Sr intermediate alloys are then added, refining temperature is controlled at 710 DEG C~730 DEG C.
5, the refining agent of melt weight 0.3%-0.5% is added in fining pot, refining agent will ensure drying, and keep away from moisture caking.It uses
Injection refining machine carries out injection refining, and furnace bottom will be inserted by refining the end of pipe, be refined to every nook and cranny, do not stayed dead angle.This skill
Art scheme mainly causes Si elements to fail in the aluminum melt of higher temperature due to the addition manner of industrial silicon there are the shortcomings that
Fusing, is affected to the interior tissue of subsequent product, to meet customer requirement.
Patent《A kind of rare-earth elements of lanthanum alloying alusil alloy and preparation method》(CN201310357494.4)、《It is a kind of
Rare Earth Elements of Praseodymium alloying alusil alloy and preparation method》(CN201310357779.8)、《A kind of Rare earth element ytterbium alloying aluminium
Silicon alloy and preparation method》(CN103469026A)、《A kind of Samarium Nitrate alloying alusil alloy and preparation method》
(CN103451489A) etc. series of patents mainly elaborate to add in the alusil alloy of si content 9.0-13.5% a certain amount of each
The method that kind rare earth element prepares alloy.Since the alloy product of the present invention belongs to high-purity AlSi alloy series, to impurity element
Especially Fe element content ranges are more demanding, therefore the component content of alloy described in these series of patents and not applicable high-purity
AlSi alloys.
Invention content
The technical problem to be solved by the present invention is to overcome existing problem, provide that a kind of silicone content is higher, eutectic point temperature
It spends lower；
It is a further object of the present invention to provide the above-mentioned welding preparation processes of al-si eutectic alloy bar.
In order to solve the above technical problem, the present invention provides the following technical solutions：
A kind of high-purity AlSi14A alloys, si content 13-15wt%, impurity content are as follows：
Fe≤0.05wt%、Mg≤0.1wt%、Cu≤0.04wt%、Mn≤0.1wt%、Zn≤0.07wt%。
The preparation process of above-mentioned high-purity AlSi14A alloys includes using raw material：4N refined aluminiums ingot, 4N fine aluminum liquids, 2202 works
Industry silicon.
Preferably, the quality of the 4N refined aluminiums ingot meets the requirement of GB/T1196-2008 standards.
Preferably, 2202 industrial silicon, quality meet the requirement of GB/T2881-2014 standards.
Preferably, the preparation process of above-mentioned high-purity AlSi14A alloys, includes the following steps：
1）Raw material is added
Raw material is made of 4N refined aluminiums ingot and 4N fine aluminum liquids and industrial silicon, is first proportionally added into 60% 4N refined aluminium ingots, heating
Fusing, then industrial silicon is layered on aluminium melt surface, after silicon fusing completely, the 4N fine aluminum liquids for adding 40% are bedded in industrial silicon
Surface ensures the abundant fusing of industrial silicon, is then adequately stirred；
2）Refining
After being sufficiently stirred, refining agent is added, and control temperature is refined at 710-730 DEG C, surface melted after refining
Slag removes totally, stands；
3）Pouring
By step 2）Refined alloy liquid cast.
Preferably, the step 1）In, aluminum melt temperature adds industrial silicon when rising to 800 DEG C；
Preferably, the industrial silicon is the massive industrial silicon toasted in advance；
It is further preferred that the massive industrial silicon toasted is layered on aluminium melt surface using fork truck；
Industrial silicon is paved it is further preferred that being taken off with slag, it is ensured that industrial silicon not aoxidize.
Preferably, the step 1）In, it is refined using the online refining equipment of 50% or more degassing efficiency；
It is further preferred that refining agent dosage is 3-5 ‰, refining time is no less than 30min.
Preferably, the step 1）In, surface slag is removed totally using the filter of specification >=40ppi；Preferably,
Stand 30min or more.
Preferably, the step 2）In, entire casting process ensures 650-680 DEG C of cast temperature.
Preferably, the step 2）In, it is cast using 6kg pig moulding machines
Advantageous effect of the present invention：
The silicone content of the high-purity AlSi14A alloy products of the present invention is higher, and relatively low eutectic temperature is 577 DEG C, product chemistry
Ingredient meets customer requirement（Impurity Fe content is strict controlled within 500ppm, and Si elements have good uniformity）.
Preparation process of the present invention changes traditional raw material addition manner, and in raw material adding procedure, a part is first added
4N refined aluminium ingots, heating fusing, are layered on aluminium melt surface by industrial silicon again when melt temperature reaches 800 DEG C, add a part
4N fine aluminum liquids are bedded in industrial silicon face, ensure the abundant fusing of industrial silicon, ensure the uniformity of Si elements.Wherein, melt is waited for
Temperature adds industrial silicon when reaching 800 DEG C, and industrial silicon is made to obtain high-temperature process, ensures the interior tissue of product.Due to Si members
Cellulose content is higher, is easily segregated, this technique suitably reduces pouring temperature, and control cast temperature is 650-680 DEG C.Further,
This technique is cast using 6kg pig moulding machines, can reduce the segregation of Si elements, ensures the uniformity of Si elements.
Preparation process of the present invention does raw material using 4N refined aluminiums ingot and fine aluminum liquid, and uses higher 2202 industrial silicon of purity,
Ensure the control of final alloy ingot product F e contents below 0.05%.
Since the density of Si is small（2.3g/cm3）, smaller than the density of aluminium.If addition manner method is improper, it be easy to cause Si
It floats, causes finished product silicone content insufficient.In order to solve the problems, such as that element silicon adds, in adding procedure, a part is first added
4N refined aluminium ingots, heating fusing, fork truck are reused when melt temperature reaches 800 DEG C, the industrial silicon toasted are layered on aluminum melt table
Face is used in combination slag to take off and industrial silicon is paved.Ensure that industrial silicon not aoxidize, after silicon fusing completely（Molten aluminum surface is without block）,
It adds a part of 4N fine aluminum liquids and is bedded in industrial silicon face, ensure the abundant fusing of industrial silicon.Subsequently through verification, this is used
Method can make silicon loss amount be less than 0.2%.
Essence in order to further illustrate the present invention, inventor have carried out following experiment.
One, in carrying out two heat small-scale tests with intermediate frequency furnace, technical data, adjusting component, according in product are drafted
The contents of Fe elements determines the area requirement of Fe contents in refined aluminium raw material and industrial silicon used, and verifies the equal of Si elements in product
Even property.Conclusion：Fe elements meet customer requirement in intermediate frequency furnace small-scale test product, and Si element uniformities are preferable.
Two, big heat production line test, examination three heats of casting, chemical composition and product appearance meet the requirements of the customers, and at
Work(sells 20.158t.Conclusion：Client feedback Si element uniformities are bad, and it is S54002 to extract lot number according to client feedback result
And two pieces of ingots in S54003, the uniformity of verification AlSi14 alloys Si, verification result such as table 1：
Table 1
As seen from the above table, Si contents are uneven in AlSi14 alloy finished products, and deviation is larger.
Three, in order to reduce the segregation of Si elements, the uniformity of Si elements is improved, the addition manner of industrial silicon is optimized, is ensured
Fusion temperature and fusing time strictly control fusion process, reinforce stirring, and moderately reduce pouring temperature（650-680℃）, so
The local homogeneity of AlSi14 alloys, verification result such as table 2 are verified with intermediate frequency furnace afterwards：
Table 2
The deviation of product part Si elements is smaller as seen from the above table, within 1%, meets the requirements.
Specific implementation mode
Hereinafter, preferred embodiments of the present invention will be described, it should be understood that preferred embodiment described herein is only used
In the description and interpretation present invention, it is not intended to limit the present invention.
Embodiment 1：
3.076 tons of 4N refined aluminium ingots are uniformly first layered on furnace bottom, heating fusing is added when temperature of aluminum liquid reaches 760 DEG C
2202 industrial silicons after 0.87 ton of preheating, make it uniformly be layered on molten aluminum surface, 2.051 tons of 4N essences are added after silicon is completely melt
Molten aluminum stirs 15 minutes, and control refining temperature is between 710-730 DEG C, and refining agent dosage is 5 ‰, refining time 35 minutes, essence
Molten aluminum surface slag removes totally after refining, stands 20 minutes and samples.Aluminium alloy ingredient is met the requirements, and in-furnace temperature control exists
It 730 DEG C or so, is cast using 6kg pig moulding machines；Molten aluminum is removed by online refining and filter plant progress degasification after blow-on eye
Slag, aluminum melt hydrogen content is less than 0.12 after line degasification after testing（mL/100gAl）, degassing efficiency reaches 55%, filter specification
For 50ppi；Cast temperature control is at 680-700 DEG C in entire casting process；Ensure coolant water temperature in 25-35 in casting process
℃；And ingot casting surface is carried out playing skin processing, preventing inside ingot, there are oxide inclusions, ensure inside ingot and appearance matter
Amount.Final production goes out high-purity AlSi14 alloys of 6kg or so, takes sample in kind to detect its ingredient, the results are shown in table below：
Embodiment 2：
4.206 tons of 4N refined aluminium ingots are uniformly first layered on furnace bottom, heating fusing is added when temperature of aluminum liquid reaches 800 DEG C
2202 industrial silicons after 1.18 tons of preheatings, make it uniformly be layered on molten aluminum surface, 2.805 tons of 4N essences are added after silicon is completely melt
Molten aluminum stirs 15 minutes, and control refining temperature is between 710-730 DEG C, and refining agent dosage is 5 ‰, refining time 35 minutes, essence
Molten aluminum surface slag removes totally after refining, stands 20 minutes and samples.Aluminium alloy ingredient is met the requirements, and in-furnace temperature control exists
It 730 DEG C or so, is cast using 6kg pig moulding machines；Molten aluminum is removed by online refining and filter plant progress degasification after blow-on eye
Slag, aluminum melt hydrogen content is less than 0.12 after line degasification after testing（mL/100gAl）, degassing efficiency reaches 55%, filter specification
For 50ppi；Cast temperature control is at 680-700 DEG C in entire casting process；Ensure coolant water temperature in 25-35 in casting process
℃；And ingot casting surface is carried out playing skin processing, preventing inside ingot, there are oxide inclusions, ensure inside ingot and appearance matter
Amount.Final production goes out high-purity AlSi14 alloys of 6kg or so, takes sample in kind to detect its ingredient, the results are shown in table below：
Embodiment 3：
4.147 tons of 4N refined aluminium ingots are uniformly first layered on furnace bottom, heating fusing is added when temperature of aluminum liquid reaches 800 DEG C
2202 industrial silicons after 1.16 tons of preheatings, make it uniformly be layered on molten aluminum surface, 2.765 tons of 4N essences are added after silicon is completely melt
Molten aluminum stirs 15 minutes, and control refining temperature is between 710-730 DEG C, and refining agent dosage is 5 ‰, refining time 35 minutes, essence
Molten aluminum surface slag removes totally after refining, stands 20 minutes and samples.Aluminium alloy ingredient is met the requirements, and in-furnace temperature control exists
It 725 DEG C or so, is cast using 6kg pig moulding machines；Molten aluminum is removed by online refining and filter plant progress degasification after blow-on eye
Slag, aluminum melt hydrogen content is less than 0.12 after line degasification after testing（mL/100gAl）, degassing efficiency reaches 55%, filter specification
For 50ppi；Cast temperature control is at 650-680 DEG C in entire casting process；Ensure coolant water temperature in 25-35 in casting process
℃；And ingot casting surface is carried out playing skin processing, preventing inside ingot, there are oxide inclusions, ensure inside ingot and appearance matter
Amount.Final production goes out high-purity AlSi14 alloys of 6kg or so, takes sample in kind to detect its ingredient, the results are shown in table below：
It is merely a preferred embodiment of the present invention, is not intended to restrict the invention, although with reference to aforementioned implementation described in upper
Invention is explained in detail for example, for those skilled in the art, still can be to foregoing embodiments
Recorded technical solution is modified or equivalent replacement of some of the technical features.All spirit in the present invention
Within principle, any modification, equivalent replacement, improvement and so on should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of preparation process of high-purity AlSi14A alloys, it is characterised in that：High-purity AlSi14A alloys si content is 13-
15wt%, impurity content are as follows：
Fe≤0.05wt%、Mg≤0.1wt%、Cu≤0.04wt%、Mn≤0 .1wt%、Zn≤ 0.07wt%；
Include using raw material：The quality of 4N refined aluminiums ingot, 4N fine aluminum liquids, 2202 industrial silicons, the 4N refined aluminiums ingot meets GB/T1196-
The requirement of 2008 standards, 2202 industrial silicon, quality meet the requirement of GB/T2881-2014 standards,
The technique includes the following steps：
1）Raw material is added
Raw material is made of 4N refined aluminiums ingot and 4N fine aluminum liquids and industrial silicon, is first proportionally added into 60% 4N refined aluminium ingots, and heating is molten
Change, then industrial silicon is layered on aluminium melt surface, after silicon fusing completely, the 4N fine aluminum liquids for adding 40% are bedded in industrial silicon table
Face ensures the abundant fusing of industrial silicon, is then adequately stirred；
2）Refining
After being sufficiently stirred, refining agent is added, and control temperature is refined at 710-730 DEG C, surface slag taken off after refining
Except clean, standing；
3）Pouring
By step 2）Refined alloy liquid cast；
The step 1）In, aluminum melt temperature adds industrial silicon when rising to 800 DEG C；
Preferably, the industrial silicon is the massive industrial silicon toasted in advance；
It is further preferred that the massive industrial silicon toasted is layered on aluminium melt surface using fork truck；
Industrial silicon is paved it is further preferred that being taken off with slag, it is ensured that industrial silicon not aoxidize.
2. the preparation process of high-purity AlSi14A alloys according to claim 1, it is characterised in that：The step 1）In, it adopts
It is refined with the online refining equipment of 50% or more degassing efficiency；
And/or refining agent dosage is 3-5 ‰, refining time is no less than 30min.
3. the preparation process of high-purity AlSi14A alloys according to claim 1, it is characterised in that：The step 1）In, it adopts
Surface slag is removed totally with the filter of specification >=40ppi；
Preferably, 30min or more is stood.
4. the preparation process of high-purity AlSi14A alloys according to claim 1, it is characterised in that：The step 2）In, it is whole
A casting process ensures 650-680 DEG C of cast temperature.
5. the preparation process of high-purity AlSi14A alloys according to claim 1, it is characterised in that：The step 2）In, it adopts
It is cast with 6kg pig moulding machines.
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