CN107675029A - A kind of anti-flaming Al Li Nb alloys - Google Patents
A kind of anti-flaming Al Li Nb alloys Download PDFInfo
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- CN107675029A CN107675029A CN201710942064.7A CN201710942064A CN107675029A CN 107675029 A CN107675029 A CN 107675029A CN 201710942064 A CN201710942064 A CN 201710942064A CN 107675029 A CN107675029 A CN 107675029A
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- 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
- 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
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
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Abstract
The invention discloses a kind of Al Li Nb aluminium lithium alloys and its processing technology during melting between 700 800 degree with fire resistance energy.By weight percentage, Li:2.0‑8.0wt.%,Nb:1.0‑2.0wt.%,Ca:1.0‑5.0wt.%,Sr:1.0‑6.0wt.%,Ce:0.2‑0.4wt.%,Gd:0.1 0.4wt.%, In 1.0 2.0wt.%, B:0.5 1.5wt.%, surplus are aluminium.By preferable alloying method, the shortcomings that can not only substantially reducing alloying element usage amount, extraordinary flame retardant effect can also be obtained, while ignition-proof element content substantially reduces, alloy burning-point is but substantially increased.It can reach to be incubated under atmospheric environment in the range of 700 800 degree and stand 5 hours without obvious burning.The material has the mechanical property of traditional aluminium lithium alloy：Yield strength is 400 650MPa, and tensile strength is 500 750MPa, and elongation percentage is 4 15%.And possesses the high thermal conductivity that traditional aluminium lithium alloy does not possess：Thermal conductivity coefficient is 120 140W/m.K, and traditional aluminium lithium alloy is 85W/m.K or so.
Description
Technical field
The present invention relates to technical field of alloy, specifically, is related to a kind of aluminium lithium alloy.
Background technology
Lithium is metallic element most light in the world, and aluminium lithium alloy is formed when lithium is added in aluminium.Lithium can reduce aluminium
Density and can improves modulus of elasticity.In general, 1wt.% lithium is often added into aluminum metal, the density of aluminium alloy just declines about
3%, and its modulus of elasticity can then rise about 6%, so as to turn into the strong competing product of composite.Aluminium lithium alloy predominantly flies
The loss of weight of machine and aerospace equipment and develop, therefore also mainly application and aerospace field, used by nuclear reactor material, tank
In terms of armor-piercing bullet, torpedo and other weapons structural members.In addition also there is abundant utilization in fields such as automobile, robots.Aluminium lithium alloy
It is mainly used in fuselage ring hatch door, fuel tank etc. on military aircraft, seating plane and helicopter.Design and make in type aircraft
In making, the quality that can make plane aluminium alloy parts using aluminium lithium alloy mitigates 14-30%, it has also become the pass of airborne vehicle of new generation
Key structural material.Aircraft is manufactured using aluminium lithium alloy, its weight can mitigate 14.6%, conservation of fuel 5.4%, aircraft manufacturing into
Originally 2.1% can be declined, 2.2% can be reduced per the annual flight expense of airplane.Because the cost of aluminium lithium alloy is only about compound
Material（Carbon fibre reinforced plastic）10%, thus upper there are obvious comparative advantages in application.
Aluminium lithium alloy has very unique performance：(1) light weight.The addition of lithium allows the density ratio of aluminium lithium alloy is most to close
The density of gold will be low.And as the increase of lithium content, its density can also be reduced further;(2) intensity is high.Aluminium lithium alloy has
Significant change will not occur because of the increase of lithium content for very high intensity, its intensity, and can be by adding copper, magnesium, zinc
The intensity of alloy is further improved Deng element;(3) rigidity is high.Aluminium lithium alloy possesses very high rigidity, and non-deformability is strong, its
Rigidity can also be improved further with the increase of lithium content;(4) it is antifatigue.Aluminium lithium alloy anti-fatigue performance is excellent, uses the longevity
Life length;(5) good ductility.Aluminium lithium alloy possesses good ductility, can effectively reduce the processing of aluminium lithium alloy
Difficulty.
Aluminium lithium alloy easily burns in fusion process, or even blast.Because the oxide and nitride of lithium
Volume be less than and generate the body of metal that these compounds are consumed, therefore its oxide and nitride are not enough to coat metal watch
Face.The oxide-film and nitride film of formation are loose porous and very crisp, and oxygen can pass through oxide-film and the hole and alloy melt of nitride film
Continue to act on, discharge substantial amounts of heat and cause aluminium lithium melt to burn.Therefore, an important topic of aluminium lithium alloy industrialization is
High-temperature oxydation burning when how to prevent the aluminium lithium alloy from being smelted under atmospheric environment.At present, conventional flame resistant method is that flux is protected
Defend the doctrine and gas protection method.These methods, which have casting and are also easy to produce flux, to be mingled with, pollutes environment and equipment and complex process etc.
Shortcoming.
By alloyage process reach it is fire-retardant be solve aluminium lithium alloy combustion problem advanced method.Alloying ignition-proof method its
Mechanism is that specific alloying element is added in aluminium lithium alloy fusion process to influence the thermodynamics and dynamics mistake of alloy oxidation
Journey, dense oxidation film and nitride film with protective effect are formed, reach the purpose for preventing alloy vigorous oxidation and nitridation, and
The tendency of oxidizing fire of the aluminium lithium alloy during following process substantially reduces, so as to improve the process safety of aluminium lithium alloy
Property.But as a kind of structural material, only there is fire resistance during melting can far can not meet requirement, it is more important
Be that final aluminium lithium alloy product will also possess gratifying mechanical strength simultaneously, at least will can reach conventional aluminium lithium alloy
Mechanical property it is horizontal.
The invention provides a kind of Al-Li-Nb aluminium lithiums between 700-800 degree with fire resistance energy during melting
Alloy, and there is the mechanical property of existing aluminium lithium alloy, and good room temperature in the alloy final products of this temperature range melting
Plasticity, there are good creep-resistant property and antioxygenic property again.The Al-Li-Nb aluminium lithium alloy melts have extremely in the quiescent state
Excellent fire resistance, it can reach and be incubated 5 hours of standing without bright under atmospheric environment in 700-800 temperature ranges
Aobvious burning.In the dynamic processes such as stirring, after its skin covering of the surface is because being stirred vigorously destroyed, rapid regeneration is remained to, is successfully hindered
Hinder the oxidizing fire of alloy.
The content of the invention
A kind of present invention aims to overcome that the deficiencies in the prior art, there is provided Al-Li-Nb aluminium lithium alloys with anti-flammability
And its processing technology.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of Al-Li-Nb aluminium lithium alloys between 700-800 degree with fire resistance energy during melting.Percentage by weight
Than meter, the composition of alloy is：Li: 2.0-8.0wt.%, Nb: 1.0-2.0wt.%,Ca: 1.0-5.0wt.%,Sr: 1.0-
6.0wt.%, Ce: 0.2-0.4wt.%, Gd:0.1-0.4wt.%, In 1.0-2.0wt.%, B:0.5-1.5wt.%, surplus
For aluminium.The aluminium lithium alloy is in fusion process because the weight for volatilizing and forming the reasons such as clinker and losing is left in 2.0-5.0wt.%
It is right.
The preparation method of above-mentioned aluminium lithium alloy, comprises the following steps：As above the raw material matched is added under atmospheric environment
Electric induction furnace in, and use silicon carbide crucible.Sensing heating forms alloy solution to 700-800 degree, and utilizes electromagnetic agitation
Effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast to waterglass mould after the insulation of 700-800 degree stands 10 minutes
Interior carry out casting.Ingot casting is subjected to deformation process at room temperature, amount is 5-10% under every time rolling.Every 3 passes need
An intermediate heat-treatment is carried out to eliminate processing hardening, technique is：210 degree, 2.1 hours.Final heat treatment after rolling
Technique is：Vacuum solid solution handles 410 degree, 3.8 hours；Vacuum aging handles 170 degree, 2.4 hours.
Compared with prior art, the present invention has the advantages that：
（1）The present situation that patent of the present invention is directed to aluminium lithium alloy under current high temperature and needs protect melting in melting provides one
The solution of kind novel materials.By the main and secondary addition element in preferred alloy, to change bath surface generation
Oxide-film and nitride film type, composition and content, so as to effectively prevent that aluminium lithium alloy burns under melting state
Phenomenon carries out scaling loss., the shortcomings that can not only substantially reducing alloying element usage amount, can be with by preferable alloying method
Extraordinary flame retardant effect is obtained, while ignition-proof element content substantially reduces, alloy burning-point is but substantially increased.
（2）During alloy melting, melt has static (insulation of melt and standing) and dynamic（The stirring of melt）Two kinds of shapes
Formula.The Al-Li-Nb aluminium lithium alloys that this patent proposes have extremely excellent fire resistance in the quiescent state, can reach in 700-
In 800 temperature ranges 5 hours are incubated and stood without obvious burning under atmospheric environment.In dynamic process, such as
Liquid alloy is stirred, blown etc. during melt treatment, after its skin covering of the surface is because being stirred vigorously destroyed, remained to quick
Regeneration, successfully hinder the oxidizing fire of alloy.Gained alloy surface oxide-film has extraordinary plasticity and viscosity, can be complete
Alloy surface is sprawled and covered on ground, is effectively stopped in oxygen intrusion aluminium alloy.
（3）The Al-Li-Nb aluminium lithium alloys have low liquid-solid phase solidification temperature range, can solve casting when hot tearing incline
Xiang great, casting it is empty and it is loose substantially, melt treatment is extensive, of poor quality, hot cracking tendency is big, casting character is poor, product into
The technical barriers such as product rate low and high temperature low intensity, waste product material and slag charge reuse difference.
（4）The material has the mechanical property of traditional aluminium lithium alloy：Yield strength is 400-650MPa, and tensile strength is
500-750MPa, elongation percentage 4-15%.And possesses the high thermal conductivity that traditional aluminium lithium alloy does not possess：Thermal conductivity coefficient is 120-
140W/m.K, traditional aluminium lithium alloy are 85W/m.K or so..
（5）The Al-Li-Nb aluminium lithium alloys are stirred between 700-800 degree, and the melt treatment such as refining is without occurring obvious burn
Phenomenon is damaged, and the weight that the aluminium lithium alloy loses in fusion process because of the reason such as volatilization and formation clinker is less than 5.0wt.%
Left and right.
（6）Smelting processing method is simple, and production cost reduces the requirement to equipment than relatively low.Possess in guarantee fire-retardant
Property while, also make it that mechanical property is further improved under alloy service life and high temperature, be easy to industrialization on a large scale should
With.The present invention can be used for manufacture to be less than 100 degree structural members in temperature in use and have highly significant light weight effect.
Embodiment
Embodiment 1
A kind of Al-Li-Nb aluminium lithium alloys of fire resistance when there is 720 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li: 5.2wt.%, Nb: 1.4wt.%,Ca: 3.6wt.%,Sr: 4.2wt.%, Ce: 0.2wt.%, Gd:
0.2wt.%, In 1.2wt.%, B:0.8wt.%, surplus are aluminium.The preparation method of alloy：As above the raw material matched is added to
In electric induction furnace under atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize electricity to 720 degree
Magnetic effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 720 degree of insulations and cast
Cause type.Ingot casting is subjected to deformation process at room temperature, amount is 6% under every time rolling.Every 3 passes need to carry out once
Intermediate heat-treatment is hardened to eliminate processing, and technique is：210 degree, 2.1 hours.Final Heat Treatment Process after rolling is：Vacuum
410 degree, 3.8 hours of solution treatment；Vacuum aging handles 170 degree, 2.4 hours.The material has the mechanics of traditional aluminium lithium alloy
Performance：Yield strength is 495MPa, tensile strength 584MPa, elongation percentage 7%.And possess what traditional aluminium lithium alloy did not possessed
High thermal conductivity：Thermal conductivity coefficient is 121W/m.K, and traditional aluminium lithium alloy is 85W/m.K or so.The alloy is small at 720 degree and 5
When it is interior between stirred under atmospheric environment, the melt treatment such as refining is without occurring obvious burning phenomenon, and material is due to evaporation
It can be controlled in 2.4wt.% or so with the raw material proportion of goods damageds caused by the reason for formation clinker.
Embodiment 2
A kind of Al-Li-Nb aluminium lithium alloys of fire resistance when there is 760 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li: 7.1wt.%, Nb: 1.2wt.%,Ca: 2.6wt.%,Sr: 3.5wt.%, Ce: 0.3wt.%, Gd:
0.2wt.%, In 1.4wt.%, B:1.2wt.%, surplus are aluminium.The preparation method of alloy：As above the raw material matched is added to
In electric induction furnace under atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize electricity to 760 degree
Magnetic effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 760 degree of insulations and cast
Cause type.Ingot casting is subjected to deformation process at room temperature, amount is 7% under every time rolling.Every 3 passes need to carry out once
Intermediate heat-treatment is hardened to eliminate processing, and technique is：210 degree, 2.1 hours.Final Heat Treatment Process after rolling is：Vacuum
410 degree, 3.8 hours of solution treatment；Vacuum aging handles 170 degree, 2.4 hours.The material has the mechanics of traditional aluminium lithium alloy
Performance：Yield strength is 425MPa, tensile strength 585MPa, elongation percentage 5%.And possess what traditional aluminium lithium alloy did not possessed
High thermal conductivity：Thermal conductivity coefficient is 132W/m.K, and traditional aluminium lithium alloy is 85W/m.K or so.The alloy is small at 760 degree and 5
When it is interior between stirred under atmospheric environment, the melt treatment such as refining is without occurring obvious burning phenomenon, and material is due to evaporation
It can be controlled in 3.1wt.% or so with the raw material proportion of goods damageds caused by the reason for formation clinker.
Embodiment 3
A kind of Al-Li-Nb aluminium lithium alloys of fire resistance when there is 790 degree of meltings.By weight percentage, alloy chemistry into
It is divided into： Li: 5.6wt.%, Nb: 1.4wt.%,Ca: 3.2wt.%,Sr: 4.2wt.%, Ce: 0.3wt.%, Gd:
0.2wt.%, In 1.6wt.%, B:0.8wt.%, surplus are aluminium.The preparation method of alloy：As above the raw material matched is added to
In electric induction furnace under atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize electricity to 790 degree
Magnetic effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 790 degree of insulations and cast
Cause type.Ingot casting is subjected to deformation process at room temperature, amount is 8% under every time rolling.Every 3 passes need to carry out once
Intermediate heat-treatment is hardened to eliminate processing, and technique is：210 degree, 2.1 hours.Final Heat Treatment Process after rolling is：Vacuum
410 degree, 3.8 hours of solution treatment；Vacuum aging handles 170 degree, 2.4 hours.The material has the mechanics of traditional aluminium lithium alloy
Performance：Yield strength is 510MPa, tensile strength 575MPa, elongation percentage 4%.And possess what traditional aluminium lithium alloy did not possessed
High thermal conductivity：Thermal conductivity coefficient is 132W/m.K, and traditional aluminium lithium alloy is 85W/m.K or so.The alloy is small at 790 degree and 5
When it is interior between stirred under atmospheric environment, the melt treatment such as refining is without occurring obvious burning phenomenon, and material is due to evaporation
It can be controlled in 2.5wt.% or so with the raw material proportion of goods damageds caused by the reason for formation clinker.
Claims (3)
- A kind of 1. Al-Li-Nb aluminium lithium alloys in melting with fire resistance energy, it is characterised in that by weight percentage, The chemical composition of alloy is：Li: 2.0-8.0wt.%, Nb: 1.0-2.0wt.%,Ca: 1.0-5.0wt.%,Sr: 1.0- 6.0wt.%, Ce: 0.2-0.4wt.%, Gd:0.1-0.4wt.%, In 1.0-2.0wt.%, B:0.5-1.5wt.%, surplus For aluminium.
- 2. the preparation method of Al-Li-Nb aluminium lithium alloys according to claim 1, it is characterised in that the preparation method bag of alloy Containing following steps：As above the raw material matched is added in the electric induction furnace under atmospheric environment, and uses silicon carbide crucible；Sensing 700-800 degree is heated to, forms alloy solution, and be sufficiently stirred 10 minutes or so using galvanomagnetic-effect；Alloy liquid is existed 700-800 degree is incubated 10 minutes and is cast to progress casting in waterglass mould.
- 3. the preparation method of Al-Li-Nb aluminium lithium alloys according to claim 1, it is characterised in that include following procedure of processing： Ingot casting is subjected to deformation process at room temperature, amount is 5-10% under every time rolling；Every 3 passes need to carry out among once Heat treatment is hardened to eliminate processing, and technique is：210 degree, 2.1 hours；Final Heat Treatment Process after rolling is：Vacuum solid solution 410 degree, 3.8 hours of processing；Vacuum aging handles 170 degree, 2.4 hours.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710942064.7A CN107675029A (en) | 2017-10-11 | 2017-10-11 | A kind of anti-flaming Al Li Nb alloys |
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| CN201710942064.7A CN107675029A (en) | 2017-10-11 | 2017-10-11 | A kind of anti-flaming Al Li Nb alloys |
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Application publication date: 20180209 |