CN107747004A - Containing Y and Te can be fire-retardant aluminium lithium alloy and its processing technology - Google Patents
Containing Y and Te can be fire-retardant aluminium lithium alloy and its processing technology Download PDFInfo
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- CN107747004A CN107747004A CN201710986276.5A CN201710986276A CN107747004A CN 107747004 A CN107747004 A CN 107747004A CN 201710986276 A CN201710986276 A CN 201710986276A CN 107747004 A CN107747004 A CN 107747004A
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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
- 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
- C22F1/02—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working in inert or controlled atmosphere or vacuum
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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
Can fire-retardant aluminium lithium alloy and its processing technology containing Y and Te in melting between 700 800 degree the invention discloses one kind.By weight percentage, the chemical composition of alloy is：Li:4.0‑8.0wt.%,Y:2.0‑4.0wt.%,Sr:2.0‑6.0wt.%,Te:1.0‑2.0wt.%,Ca:1.0‑3.0wt.%,Mn:1.0‑2.0wt.%,Ba:0.5 1.5wt.%, Er:0.2 0.6wt.%, Dy:0.2 0.3wt.%, surplus are aluminium.The present situation that this patent is directed to aluminium lithium alloy under current high temperature and needs protect melting in melting provides a kind of novel materials solution.Change the type of the oxide-film of bath surface generation and nitride film, composition and content by screening alloying element, the fine and close lasting diaphragm of a Rotating fields is formed in aluminium lithium bath surface.The alloy melt has extremely excellent fire resistance in the quiescent state, can reach and be incubated 5 hours without obvious burning under atmospheric environment in the range of 700 800 degree.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 rapid regeneration, successfully hinder the oxidizing fire of alloy.
Description
Technical field
The present invention relates to technical field of alloy, specifically, is related to a kind of aluminium lithium alloy.
Background technology
Density very little (0.53 g/cm of lithium3), it is the 1/14 of steel, the 1/5 of aluminium, the 1/3 of magnesium.When lithium is added in aluminium just
Form aluminium lithium alloy structural material very light so far.It has good specific strength and modulus of elasticity, and its density is only
There is 2.4g/cm3.With the increase of lithium content, the density of aluminium lithium alloy can be reduced further, and with more excellent cold and hot
Deformability, preferable corrosion resistance and suitable ductility.In general, often adding 1wt.% lithium, density can be enabled aluminum alloy to
3% is reduced, modulus improves 6%.
Aluminium lithium alloy possesses the high damping properties of excellent mechanical property and vibration-damping noise-reducing, and radioresistance electromagnetism interference
Performance, represent the frontline technology of aluminium alloy development.In Aero-Space, weapons military project, petrochemical industry, machinery instrument, food doctor
The military projects such as Room apparatus, outdoor equipment and civil area all have extensive use.The anti-high energy particle penetration capacity of aluminium lithium alloy is strong, especially
It is the advantage of its deformation performance so that it has broad application prospects in fields such as aerospace, weapons, automobile, electronics.In addition,
Aluminium lithium alloy also has other series of advantages:Compressive yield strength is beyond common aluminum alloy 2/3, impact insensitive to breach
Good toughness, bending strength are big, the anisotropy unobvious of mechanical performance, plasticity is good, be easily deformed processing, easy welding forming,
The big thermal conductivity of specific heat capacity is low.Aluminium lithium alloy can be substituted partly to be closed applied to the aluminium in Aeronautics and Astronautics field and other aluminium at present
Golden material, is with a wide range of applications.Aluminium alloy is substituted to manufacture aircraft using advanced aluminium lithium alloy, weight can mitigate
14.6%, fuel can save 55.4%, and aircraft cost will decline 2.1%, and the annual flight expense of each airplane can also decline
2.2%.Aluminium lithium alloy and steel structural part ratio can loss of weight 40-50%, being capable of loss of weight 20-30% with general aluminium alloy ratio.Reducing
Satellite structure mass of system, improve and achieve significant effect in Piggybacking ability.
Aluminium lithium alloy lithium in fusion process is easy to same surrounding medium and redox reaction generation oxide and nitrogen occurs
Compound film.These loose compound films can not prevent the further reaction of lithium and extraneous medium, cause continuing for lithium in alloy
Scaling loss and blast.The key of aluminium lithium alloy melting process is exactly fire-retardant, and this is determined by the chemical activity characteristic of lithium.Aluminium lithium
Alloy melting process is anti-flaming to use flux protection earliest, the general villaumite for using low melting point.But because its density is big, at any time
Between extension can constantly settle, therefore covering effect can not be lasting.And portion of flux remains in shape in aluminium alloy as slag
Into field trash, low-alloyed mechanical property drops.Gas shield is the external current anti-burning method generally used, and conventional gas is
SF6.But SF6 is a kind of gas of very strong generation greenhouse effects.Environmental quality is examined closely again in the mankind and the whole world is just being
Today of greenhouse effects and unremitting effort is reduced, SF6 protection melting techniques receive huge challenge.
Fire-retardant purpose is reached by the method for alloying, is one of developing direction for solving aluminium lithium alloy combustion problem.
The mechanism of alloying ignition-proof is the thermodynamics and dynamics process that the suitable member of addition in the alloy usually influences alloy oxidation.It is logical
Cross and the dense oxidation film with protective effect and nitride film are formed on alloy melt surface to reach the prevention violent oxygen of alloy melt
Change and blast purpose.Compared with flux protection and gas shield, alloying ignition-proof can eliminate flux and be mingled with, and improve the power of alloy
Performance and corrosion resistance are learned, eliminates pollution of the pernicious gas to air.But as a kind of structural material, only there is melting
When fire resistance can far can not meet requirement, it is often more important that final aluminium lithium alloy product will also possess order simultaneously
The mechanical strength of people's satisfaction, the mechanical property that can at least reach conventional aluminium lithium alloy are horizontal.It is relatively early to have been reported that, in aluminium lithium alloy
Middle addition Be and Ca can significantly improve the antioxygenic property of aluminium lithium alloy, but Be has severe toxicity, and excessive Ca can seriously damage aluminium
The mechanical property of lithium alloy, it significantly limit the industrial applications of Be and Ca in fire-retardant aluminium lithium alloy.
The content of the invention
Present invention aims to overcome that the deficiencies in the prior art, there is provided one kind has between 700-800 degree during melting
The aluminium lithium alloy and its processing technology containing Y and Te with fire resistance energy.
To achieve these goals, the present invention adopts the following technical scheme that：
A kind of aluminium lithium alloy containing Y and Te between 700-800 degree with fire resistance energy during melting.Percentage by weight
Than meter, the composition of alloy is：Li:4.0-8.0wt.%,Y:2.0-4.0wt.%,Sr:2.0-6.0wt.%,Te:1.0-2.0wt.%,
Ca: 1.0-3.0wt.%, Mn:1.0-2.0wt.%, Ba:0.5-1.5wt.%, Er:0.2-0.6wt.%, Dy: 0.2-
0.3wt.%, surplus are aluminium.The aluminium lithium alloy is in fusion process because the weight for volatilizing and forming the reasons such as clinker and losing exists
2.0-5.0wt.% or so.
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, and utilize galvanomagnetic-effect to 700-800 degree
It is sufficiently stirred 10 minutes or so；Alloy liquid is cast in waterglass mould for 10 minutes in the insulation of 700-800 degree and cast
Shaping.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 once
Intermediate heat-treatment is hardened to eliminate processing, and technique is：220 degree, 2.8 hours；Final Heat Treatment Process after rolling is：Vacuum
350 degree, 3.6 hours of solution treatment；Vacuum aging handles 170 degree, 2.5 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
A kind of solution of novel materials.By the main and secondary addition element in preferred alloy, to change bath surface life
Into oxide-film and nitride film type, composition and content, so as to effectively prevent that aluminium lithium alloy fires under melting state
Burn phenomenon and carry out scaling loss.By preferable alloying method, the shortcomings that can not only substantially reducing alloying element usage amount, may be used also
To obtain extraordinary flame retardant effect, 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 aluminium lithium alloy that this patent proposes has extremely excellent fire resistance in the quiescent state, can reach in 700-800 degree scopes
It is interior that 5 hours are stood under atmospheric environment without obvious burning.Stirred in dynamic process, such as to liquid alloy
During the melt treatment such as mixing, blowing, after its skin covering of the surface is because being stirred vigorously destroyed, rapid regeneration is remained to, successfully hinders to close
The oxidizing fire of gold.Gained alloy surface oxide-film has extraordinary plasticity and viscosity, intactly can sprawl and cover
Alloy surface, effectively stop in oxygen intrusion aluminium alloy.
（3）Aluminium lithium alloy material of the flame resistant containing Y and Te has low liquid-solid phase solidification temperature range, can solve
Hot cracking tendency is big during casting, and casting is empty and loose obvious, and melt treatment is extensive, of poor quality, hot cracking tendency is big, castability
Can poor, the technical barrier such as product yield rate low and high temperature low intensity, waste product material and slag charge reuse difference.With good castability
Can, the compression casting being suitable under the protective atmosphere of thin-walled parts, particularly it is adapted to casting to require possess the light of lightweight feature
Type structural material.
（4）The material has the mechanical property of traditional aluminium lithium alloy at room temperature：Yield strength is 400-650MPa, tension
Intensity is 500-750MPa, elongation percentage 4-15%.And the mechanical behavior under high temperature not possessed with traditional aluminium lithium alloy：At 300 degree
Under, yield strength 350-400MPa, and traditional material is under 300 degree, yield strength is 250-300MPa or so.
（5）The aluminium lithium alloy containing Y and Te is stirred between 700-800 degree, and the melt treatment such as refining is without occurring
Obvious burning phenomenon, 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.% or so.
（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.Have
Cheap, tissue isotropism, special tissue can be obtained, complex-shaped part is readily produced, can be given birth to small lot
Many advantages, such as production can also produce in enormous quantities.
Embodiment
Embodiment 1
A kind of aluminium lithium alloy containing Y and Te of fire resistance when there is 720 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li:4.3wt.%,Y:2.8wt.%,Sr:2.3wt.%,Te:1.6wt.%,Ca:1.9wt.%,Mn:1.8wt.%, Ba:
0.6wt.%, Er:0.4wt.%, Dy:0.2wt.%, surplus are aluminium.The preparation method of alloy：As above the raw material matched is added
In electric induction furnace under to atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize to 720 degree
Galvanomagnetic-effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 720 degree of insulations and carried out
Casting.Ingot casting is subjected to deformation process at room temperature, amount is 6% under every time rolling.Every 3 passes need carry out one
Secondary intermediate heat-treatment is hardened to eliminate processing, and technique is：220 degree, 2.8 hours；Final Heat Treatment Process after rolling is：Very
350 degree, 3.6 hours of empty solution treatment；Vacuum aging handles 170 degree, 2.5 hours.The material has traditional aluminium lithium alloy room temperature
Under mechanical property：Yield strength is 520MPa, tensile strength 640MPa, elongation percentage 8%.And there is traditional aluminium lithium alloy
The mechanical behavior under high temperature not possessed：Under 300 degree, yield strength 375MPa, and traditional material is under 300 degree, yield strength
For 293MPa or so.The alloy in 720 degree and 5 hours between carry out atmospheric environment under stir, refining etc. melt treatment and
Obvious burning phenomenon does not occur, and material raw material proportion of goods damageds caused by evaporating and being formed due to clinker can control
2.6wt.% or so.
Embodiment 2
A kind of aluminium lithium alloy containing Y and Te of fire resistance when there is 740 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li:6.9wt.%,Y:3.5wt.%,Sr:3.8wt.%,Te:1.6wt.%,Ca:2.1wt.%,Mn:1.6wt.%, Ba:
0.8wt.%, Er:0.5wt.%, Dy:0.2wt.%, surplus are aluminium.The preparation method of alloy：As above the raw material matched is added
In electric induction furnace under to atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize to 740 degree
Galvanomagnetic-effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 740 degree of insulations and carried out
Casting.Ingot casting is subjected to deformation process at room temperature, amount is 8% under every time rolling.Every 3 passes need carry out one
Secondary intermediate heat-treatment is hardened to eliminate processing, and technique is：220 degree, 2.8 hours；Final Heat Treatment Process after rolling is：Very
350 degree, 3.6 hours of empty solution treatment；Vacuum aging handles 170 degree, 2.5 hours.The material has traditional aluminium lithium alloy room temperature
Under mechanical property：Yield strength is 510MPa, tensile strength 635MPa, elongation percentage 12%.And there is traditional aluminium lithium alloy
The mechanical behavior under high temperature not possessed：Under 300 degree, yield strength 394MPa, and traditional material is under 300 degree, yield strength
For 279MPa or so.The alloy in 740 degree and 5 hours between carry out atmospheric environment under stir, refining etc. melt treatment and
Obvious burning phenomenon does not occur, and material raw material proportion of goods damageds caused by evaporating and being formed due to clinker can control
3.6wt.% or so.
Embodiment 3
A kind of aluminium lithium alloy containing Y and Te of fire resistance when there is 750 degree of meltings.By weight percentage, alloy chemistry into
It is divided into：Li:5.6wt.%,Y:3.2wt.%,Sr:2.9wt.%,Te:1.6wt.%,Ca:1.8wt.%, Mn:1.6wt.%, Ba:
1.2wt.%, Er:0.5wt.%, Dy:0.2wt.%, surplus are aluminium.The preparation method of alloy：As above the raw material matched is added
In electric induction furnace under to atmospheric environment, and use silicon carbide crucible.Sensing heating forms alloy solution, and utilize to 750 degree
Galvanomagnetic-effect is sufficiently stirred 10 minutes or so.Alloy liquid is cast in waterglass mould for 10 minutes in 750 degree of insulations and carried out
Casting.Ingot casting is subjected to deformation process at room temperature, amount is 10% under every time rolling.Every 3 passes need carry out one
Secondary intermediate heat-treatment is hardened to eliminate processing, and technique is：220 degree, 2.8 hours；Final Heat Treatment Process after rolling is：Very
350 degree, 3.6 hours of empty solution treatment；Vacuum aging handles 170 degree, 2.5 hours.The material has traditional aluminium lithium alloy room temperature
Under mechanical property：Yield strength is 526MPa, tensile strength 680MPa, elongation percentage 12%.And there is traditional aluminium lithium alloy
The mechanical behavior under high temperature not possessed：Under 300 degree, yield strength 390MPa, and traditional material is under 300 degree, yield strength
For 253MPa or so.The alloy in 750 degree and 5 hours between carry out atmospheric environment under stir, refining etc. melt treatment and
Obvious burning phenomenon does not occur, and material raw material proportion of goods damageds caused by evaporating and being formed due to clinker can control
3.1wt.% or so.
Claims (3)
1. a kind of aluminium lithium alloy containing Y and Te in melting with fire resistance energy, it is characterised in that by weight percentage, close
Gold chemical composition be：Li:4.0-8.0wt.%,Y:2.0-4.0wt.%,Sr:2.0-6.0wt.%,Te:1.0-2.0wt.%,Ca:
1.0-3.0wt.%, Mn:1.0-2.0wt.%, Ba:0.5-1.5wt.%, Er:0.2-0.6wt.%, Dy:0.2-0.3wt.%,
Surplus is aluminium.
2. according to claim 1 can fire-retardant aluminium lithium alloy containing Y and Te, it is characterised in that the preparation method of alloy includes as follows
Step：As above the raw material matched is added in the electric induction furnace under atmospheric environment, and uses silicon carbide crucible；Sensing heating arrives
700-800 degree, alloy solution is formed, and be sufficiently stirred 10 minutes or so using galvanomagnetic-effect；By alloy liquid in 700-800 degree
Insulation is cast in waterglass mould for 10 minutes carries out casting.
3. according to claim 1 can fire-retardant aluminium lithium alloy containing Y and Te, it is characterised in that include following procedure of processing：Will casting
Ingot carries out deformation process at room temperature, and amount is 5-10% under every time rolling；Every 3 passes need to carry out at an intermediate heat
Reason is hardened to eliminate processing, and technique is：220 degree, 2.8 hours；Final Heat Treatment Process after rolling is：Vacuum solid solution processing
350 degree, 3.6 hours；Vacuum aging handles 170 degree, 2.5 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710986276.5A CN107747004A (en) | 2017-10-20 | 2017-10-20 | Containing Y and Te can be fire-retardant aluminium lithium alloy and its processing technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710986276.5A CN107747004A (en) | 2017-10-20 | 2017-10-20 | Containing Y and Te can be fire-retardant aluminium lithium alloy and its processing technology |
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| Publication Number | Publication Date |
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| CN107747004A true CN107747004A (en) | 2018-03-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710986276.5A Withdrawn CN107747004A (en) | 2017-10-20 | 2017-10-20 | Containing Y and Te can be fire-retardant aluminium lithium alloy and its processing technology |
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Application publication date: 20180302 |
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