CN106756294A - Aluminium alloy and preparation method thereof for preparing phone housing - Google Patents
Aluminium alloy and preparation method thereof for preparing phone housing Download PDFInfo
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- CN106756294A CN106756294A CN201611187119.XA CN201611187119A CN106756294A CN 106756294 A CN106756294 A CN 106756294A CN 201611187119 A CN201611187119 A CN 201611187119A CN 106756294 A CN106756294 A CN 106756294A
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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
- 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
- C22F1/002—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working by rapid cooling or quenching; cooling agents used therefor
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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
- C22F1/043—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 of alloys with silicon as the next major constituent
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Abstract
The present invention provides a kind of aluminium alloy for preparing phone housing and preparation method thereof, belongs to field of aluminum alloys.The aluminium alloy meter includes silicon 2.5 4.5%, copper 1 1.8%, iron 0.5 1.5%, magnesium 0.2 0.4%, boron 0.06 0.08%, titanium 0.04 0.09%, zirconium 0.04 0.08%, vanadium 0.03 0.08%, gadolinium 0.01 0.02%, neodymium 0.01 0.02%, samarium 0.01 0.02%, lanthanum 0.01 0.03%, balance of aluminium.The aluminium alloy has stronger mechanical strength and heat conductivility.The preparation method includes that carrying out ingot casting, hot extrusion, quenching and Ageing Treatment successively by above-mentioned formula is obtained aluminium alloy, and preparation process is simple can effectively remove alloy internal stress, strengthen alloy mechanical property.
Description
Technical field
The present invention relates to field of aluminum alloys, and more particularly to a kind of aluminium alloy and its preparation side for preparing phone housing
Method.
Background technology
Aluminium alloy is the alloy general name based on aluminium, and main alloy element has copper, silicon, magnesium, zinc or manganese, secondary alloy unit
Have nickel, iron, titanium, chromium or lithium etc..The good processability of aluminium alloy, especially hypoeutectic silico-aluminum, not only good processability,
And light specific gravity, surface aesthetic and corrosion-resistant, good casting property, product comprehensive mechanical property is good, can be used to make variform
Part, be used widely in many fields.Electronic product generally needs the structural member of complex precise, therefore die casting aluminium to close
Gold turns into conventional structural member.
With electronic product, especially mobile phone, computer etc. develop to lightening and multifunction direction, and it is to thermal diffusivity
The requirement more and more higher of energy and anti-screen effect etc., therefore, high heat conductance, the cast aluminium alloy gold of low shielding action have important
Application prospect.The pack alloy for being most commonly used to produce phone housing at present is ADC12, and the alloy has good castability
Energy, mechanical strength and corrosion resisting property, therefore be used widely.However, the thermal conductivity of the alloy is relatively low, mobile phone is caused to radiate not
Freely, the safety in utilization and service life of mobile phone are influenceed；Meanwhile, the signal shielding effect of the aluminium alloy is strong, and it can be to mobile phone
Communication and networking produce large effect.In the prior art generally using reduce phone housing thickness method increased thermal conductivity and
Signal reception, but, its protective effect is reduced after phone housing reduces, and mobile phone is easily damaged.
The content of the invention
It is an object of the invention to provide a kind of aluminium alloy for preparing phone housing, its good heat conductivity and machinery is strong
Degree is high.
Another object of the present invention is to provide the above-mentioned preparation method for preparing the aluminium alloy of phone housing, the method
The surface tension of the impurity content and aluminum alloy melt in raw material can be effectively reduced, the mechanical property of aluminium alloy is improved.
The present invention is solved its technical problem and is realized using following technical scheme.
The present invention propose a kind of aluminium alloy for preparing phone housing, its by weight percentage, including：
Silicon 2.5-4.5%, copper 1-1.8%, iron 0.5-1.5%, magnesium 0.2-0.4%, boron 0.06-0.08%, titanium 0.04%-
0.09%th, zirconium 0.04-0.08%, vanadium 0.03-0.08%, gadolinium 0.01-0.02%, neodymium 0.01-0.02%, samarium 0.01-0.02%,
Lanthanum 0.01-0.03%, balance of aluminium.
The present invention proposes a kind of preparation method for preparing the aluminium alloy of phone housing, and it includes：
Weigh raw material in proportion, raw material melted in container, from container bottom to melt in be passed through preheating 2-3min after
Inert gas stand 30-40min and scum silica frost is fully floated on surface, skim to be incubated after scum silica frost and stand 10-20min, be cast into
Type obtains aluminium alloy cast ingot；
Aluminium alloy cast ingot is carried out into hot extrusion, Quenching Treatment and Ageing Treatment successively；The temperature of hot extrusion
It it is 345-355 DEG C, speed is 0.5-0.8m/min；The temperature of Quenching Treatment is 480-510 DEG C；The temperature of Ageing Treatment is 165-
180℃。
The beneficial effect of the aluminium alloy for preparing phone housing of the embodiment of the present invention and preparation method thereof is：The present invention
The aluminium alloy for preparing ship cylinder piston for providing adds element silicon and copper to improve the intensity of aluminium alloy.In aluminium alloy
Middle introducing boron, can play a part of crystal grain thinning enhancing mechanical strength；Meanwhile, boron can strengthen aluminium alloy inside free electron
Mobility, improve aluminium alloy heat conductivility.Provided by the present invention for being added in the aluminium alloy for preparing phone housing
The eutectic of micro gadolinium, neodymium, four kinds of rare earth elements of samarium and lanthanum, gadolinium and neodymium can effectively refine the crystal structure of the second phase,
Make the crystal grain distribution of strengthening phase evenly, electronic behavior ability enhancing, so as to the mechanical strength and heat conductivility that enable aluminum alloy to increase
By force.Neodymium, three kinds of elements of samarium and lanthanum eutectic purification capacity it is strong, it can effectively remove metal in aluminium alloy and nonmetallic miscellaneous
Matter such as oxide etc., reduces surface tension, makes electron mobility stronger, so as to strengthen the mechanical strength and thermal conductivity of aluminium alloy
Energy.
The preparation method carries out the preparation of aluminium alloy using the formula of above-mentioned aluminium alloy, and its obtained aluminium alloy has concurrently excellent
Crocking resistance, heat conductivility and anti-shielding performance.In preparation process, inert gas is passed through in melt, be easy in raw material
The gas and solid impurity in portion float and remove, so as to improve the combination property of aluminium alloy.The preparation method operation is simple simultaneously
And it is time-consuming less, the manufacturing cycle can be shortened, the energy-conservation green for meeting abbreviated system is required.
Specific embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below will be in the embodiment of the present invention
Technical scheme be clearly and completely described.Unreceipted actual conditions person, builds according to normal condition or manufacturer in embodiment
The condition of view is carried out.Agents useful for same or the unreceipted production firm person of instrument, are the conventional product that can be obtained by commercially available purchase
Product.
Aluminium alloy for preparing phone housing of the embodiment of the present invention and preparation method thereof is specifically described below.
A kind of aluminium alloy for preparing phone housing, its by weight percentage, including：
Silicon 2.5-4.5%, copper 1-1.8%, iron 0.5-1.5%, magnesium 0.2-0.4%, boron 0.06-0.08%, titanium 0.04-
0.09%th, zirconium 0.04-0.08%, vanadium 0.03-0.08%, gadolinium 0.01-0.02%, neodymium 0.01-0.02%, samarium 0.01-0.02%,
Lanthanum 0.01-0.03%, balance of aluminium.
Wherein, the Main Function of element silicon and copper is to increase the hardness of aluminium alloy for preparing phone housing and resistance to
Frictional behaviour, can be effectively protected to mobile phone, mitigate the situation that mobile phone is scratched or damaged in use.
Silicon can form Al-Si eutectic liquid phases with aluminium, can effectively improve aluminium alloy casting fluidity.Silicone content is higher,
The casting fluidity of aluminium alloy is better；Meanwhile, the chemical stability of silicon crystal grain is good and with hardness (HV870-1050) higher,
The hardness of alloy can be improved.The increase of silicon out of aluminium alloy content enables aluminum alloy to have the wearability higher than fine aluminium.
Copper is added in the Al-Si alloys can form αsolidsolution, CuAl2With Si phases, α phases respectively with CuAl2Constituted with Si
Two-phase eutectic, while these three mutually can collectively form three-phase eutectic again, can carry out solution strengthening and disperse to aluminium alloy
Reinforcing.In the presence of copper is solid-solution in aluminum substrate or with granular compound as hardening constituent, the resistance to of aluminium alloy is remarkably improved
Frictional behaviour.
A small amount of boron element is introduced in aluminium alloy can also play a part of crystal grain thinning, can reduce creep rate, and
And the anti-fatigue performance of improvement aluminium alloy, strengthen the mechanical strength of aluminium alloy.Meanwhile, boron can strengthen the movable energy of free electron
Power, improves the heat conductivility of aluminium alloy.
Aluminium alloy provided by the present invention for preparing phone housing adds micro gadolinium, neodymium, samarium, four kinds of lanthanum in the feed
Rare earth metal.On the one hand, studied through inventor and found, wherein, the eutectic of gadolinium and neodymium can refine the crystal structure of the second phase,
Make the crystal grain distribution of strengthening phase evenly, electronic behavior ability enhancing, so as to the mechanical strength and heat conductivility that enable aluminum alloy to increase
By force.
When silicon in aluminium alloy and too high copper content, because the crystal grain of hardening constituent is larger and skewness, aluminium alloy
Tensile property and heat conductivility reduction.Found through studying people, when silicon in aluminium alloy：Copper：The ratio of (gadolinium+neodymium) is adjusted to 2.5-
4.5：1-1.8：0.02-0.04, preferably 2.75-4.25：1.2-1.6：During the scope of 0.025-0.035, its grain refinement effect
It is really good, and free electron is active, the aluminium alloy has excellent thermal conductivity and rigidity concurrently.
On the other hand, the physicochemical properties of rare earth element are active, and adding micro mixed rare-earth elements can be with aluminium alloy
The impurity elements such as oxygen, hydrogen, nitrogen, carbon, phosphorus, sulphur, iron, lead in the liquid dystectic compound of reaction generation is simultaneously precipitated, to aluminium alloy
Liquid has catharsis, can reduce the surface tension of aluminum alloy melt, eliminates the harm of metal and nonmetallic inclusion element, improves aluminium
The casting fluidity of aluminium alloy, the mechanical property of aluminium alloy.And found through studying people, when the miscellaneous effect of the eutectic of scandium, holmium and yttrium
Really excellent, it can reduce surface tension, and make electron mobility stronger, so as to strengthen the mechanical strength and thermal conductivity of aluminium alloy
Energy.
Additionally, in the present invention, the Main Function of iron is the sticking to mould for reducing aluminium alloy, iron forms Al-Si-Fe with silicon and aluminium
It is partial crystallization thing, contributes to the dispersion-strengthened of aluminium alloy, makes the heat conduction of alloy evenly, the mechanical strength for improving aluminium alloy
Deng.
The Main Function of magnesium is crystal grain thinning, so as to improve the yield strength of aluminium alloy；Magnesium can form Mg2Si reinforcings with silicon
Phase, its rigidity that can increase aluminium alloy.The addition of magnesium can reduce the tendency of the sticking to mould of aluminum alloy melt, make die casting surface light
It is sliding, it is to avoid to occur damaging during the aluminium alloy demoulding.
Titanium and reactive aluminum form TiAl3Compound, can refine α-Al crystal grain.The micro titanium elements of addition, can make α-Al brilliant
Grain is changed into the equiax crystal of fine uniform from thick dendroid, improves the casting fluidity of aluminum alloy melt, improves aluminium alloy
Structural homogenity, improves the mechanical strength and heat conductivility of aluminium alloy.
Additionally, introducing zr element and v element in aluminium alloy, zirconium and vanadium are while the second phase of stabilization is formed, moreover it is possible to
The crystal grain of enough refining aluminum alloys, plays invigoration effect.
A kind of preparation method for preparing the aluminium alloy of phone housing, it includes：
Weigh raw material in proportion, raw material melted in container, from container bottom to melt in be passed through preheating 2-3min after
Inert gas stand 30-40min and scum silica frost is fully floated on surface, skim to be incubated after scum silica frost and stand 10-20min, be cast into
Type obtains aluminium alloy cast ingot.
Aluminium alloy cast ingot is carried out into hot extrusion, Quenching Treatment and Ageing Treatment successively；The temperature of hot extrusion
It it is 345-355 DEG C, speed is 0.5-0.8m/min；The temperature of Quenching Treatment is 480-510 DEG C；The temperature of Ageing Treatment is 165-
180℃。
More excellent, when raw material is delivered, fine aluminium ingot is added into smelting furnace first, about 600 DEG C are warming up to, gradually heat up thereafter
To about 700 DEG C, heating rate is 10-15 DEG C/min, adds and is closed containing silicon, copper, iron, magnesium, boron, titanium, zirconium and vanadium and the middle of aluminium
Gold, after adding misch metal alloy after alloy fine melt in container.
The heating mode of above-mentioned segmented can be such that each component in alloy fully mixes, and be conducive to improving the machinery of alloy
Intensity.Because the content of rare metal is relatively low, for the alloy that processability is more uniformly distributed, should trying one's best, it is equal to disperse rare metal
It is even, therefore mixed rare earth alloy is added after remaining alloy has been dissolved, when rare metal instantaneous touch is higher than itself fusing point
Melt when, own temperature is drastically raised, and its rapid melting simultaneously disperses rapidly in the melt, and due to the element that has melted
Mobility, the rare skill element for adding afterwards quickly and uniformly disperse in the middle of the melt of mixing, can reduce the life of bubble
Into, during, being acted on the bubbling of inert gas, the impurity such as scum silica frost and residue with complete liquid level and is removed, and is further reduced
Fault in material during following process, each component in rare earth metal and alloy can be combined fully, make its grain refining effect
It is good；It can be such that the impurity in mischmetal and alloy fully reacts simultaneously, improve impurity-eliminating effect, further improve the comprehensive of alloy
Close performance.
Inert gas is passed through in melt from bottom, inert gas is extremely low due to the small simultaneous reactions activity of its own density
Feature, the partial impurities in melt, slag etc. can be swept along and take to liquid level by it in floating-upward process.Being used to discharge makes in melt
Gas simultaneously makes impurity float on aluminium alloy liquid level, its impurity content that can effectively lower aluminium alloy, improves the mechanics of aluminium alloy
Performance.Using the inert gas after preheating, one side gas fluidity is strong, and degassing effect is good；On the other hand, it is prevented from gas
Temperature official post crystal and aluminum alloy melt between is locally separated out or assembled, so as to influence the uniformity and electronic behavior energy of crystal grain
Power, reduces the mechanical strength and heat conductivility of aluminium alloy.
Hot extrusion, Quenching Treatment and Ageing Treatment can effectively reduce the surface tension of aluminium alloy, reduce aluminium alloy
Internal stress, making the mechanical strength of the aluminium alloy strengthens.
The temperature of Quenching Treatment is 480-510 DEG C, it is preferable that the insulation operation of 10-20min is carried out before cooling, it can
Second is set mutually fully to carry out solid solution, the uniformity of crystal distribution in the second phase of enhancing, so as to improve the mechanical property of aluminium alloy.
Further, cooling operation for the first time and second cooling operation, for the first time cooling operation are included after insulation operation
It is that aluminium alloy cast ingot is cooled to 300-350 DEG C in 2-5min, the operation of fast cooling is prevented from temperature-fall period the not isomorphous
Body successively separates out the phenomenon for causing crystal grain distribution uneven or even luming；The cooling rate of second cooling operation for 10-15 DEG C/
Min, solid solution phase is used after separating out lowers the temperature at a slow speed, and it can reduce the stress inside alloy, further enhance the machinery of aluminium alloy
Intensity.
Further, the time of Ageing Treatment is 2-6 hours in preparation method of the invention, it is therefore preferable to 3-6 hours, its
Residual stress in alloy and time-consuming shorter can be fully eliminated, the manufacturing cycle can be shortened, the energy-conservation for meeting abbreviated system is green
Color requirement.
Feature of the invention and performance are described in further detail with reference to embodiments.
Embodiment 1
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 2min after inert gas and standing 30min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 10min.By aluminium alloy cast ingot at a temperature of 345 DEG C with the extrusion speed of 0.5m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 480 DEG C and 10min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 300 DEG C within 5min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 10 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 165 DEG C and is incubated 6 hours.
Embodiment 2
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 2min after inert gas and standing 30min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 10min.By aluminium alloy cast ingot at a temperature of 345 DEG C with the extrusion speed of 0.5m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 490 DEG C and 10min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 315 DEG C within 4min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 10 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 165 DEG C and is incubated 5 hours.
Embodiment 3
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 3min after inert gas and standing 35min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 15min.By aluminium alloy cast ingot at a temperature of 350 DEG C with the extrusion speed of 0.6m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 500 DEG C and 15min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 330 DEG C within 4min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 12 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 170 DEG C and is incubated 4 hours.
Embodiment 4
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 3min after inert gas and standing 40min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 15min.By aluminium alloy cast ingot at a temperature of 355 DEG C with the extrusion speed of 0.7m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 500 DEG C and 20min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 340 DEG C within 3min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 15 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 175 DEG C and is incubated 3 hours.
Embodiment 5
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 3min after inert gas and standing 40min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 20min.By aluminium alloy cast ingot at a temperature of 355 DEG C with the extrusion speed of 0.8m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 510 DEG C and 20min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 350 DEG C within 2min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 15 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 180 DEG C and is incubated 2 hours.
Comparative example 1
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 3min after inert gas and standing 35min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 15min.By aluminium alloy cast ingot at a temperature of 350 DEG C with the extrusion speed of 0.6m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 500 DEG C and 15min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 330 DEG C within 4min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 12 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 170 DEG C and is incubated 4 hours.
Comparative example 2
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 3min after inert gas and standing 35min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 15min.By aluminium alloy cast ingot at a temperature of 350 DEG C with the extrusion speed of 0.6m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 500 DEG C and 15min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 330 DEG C within 4min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 12 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 170 DEG C and is incubated 4 hours.
Comparative example 3
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.From container bottom to molten
In vivo be passed through preheating 3min after inert gas and standing 35min makes scum silica frost fully float on aluminum alloy melt surface, skim scum silica frost
The aluminium alloy cast ingot of cast molding after standing 15min.By aluminium alloy cast ingot at a temperature of 350 DEG C with the extrusion speed of 0.6m/min
Carry out hot extrusion.Aluminium alloy cast ingot after hot extrusion is heated to 500 DEG C and 15min is incubated；Aluminium after insulation is closed
Golden ingot casting is cooled to 330 DEG C within 4min, then is cooled to room temperature completion Quenching Treatment with the cooling rate of 12 DEG C/min.To quench
Aluminium alloy cast ingot after fire is treated is heated to 170 DEG C and is incubated 4 hours.
Comparative example 4
A kind of preparation method for preparing the aluminium alloy of phone housing, including：
Composition according to table 1 prepares aluminium alloy stock, and melt is obtained after raw material is melted in a reservoir.Melt is stood
35min makes scum silica frost fully float on aluminum alloy melt surface, skims the aluminium alloy cast ingot that scum silica frost stands cast molding after 15min.Will
Aluminium alloy cast ingot carries out hot extrusion at a temperature of 350 DEG C with the extrusion speed of 0.6m/min.Aluminium after hot extrusion is closed
Golden ingot casting be heated to 500 DEG C after with 5-10min within be cooled to room temperature complete Quenching Treatment.By the aluminium alloy after Quenching Treatment
Ingot casting is heated to 170 DEG C and is incubated 4 hours.
Table 1*
*：On the basis of the total amount of aluminium alloy, by weight percentage, balance of aluminium.
Aluminium alloy to embodiment 1-5 and comparative example 1-4 carries out crocking resistance test.Will be straight using dimension formula hardometer
Footpath is 12.7mm and thickness is for the aluminium alloy disk of 3mm is carried out at least under conditions of pressing-in force is 3kg and the dwell time is 15s
3 tests, the average value of the data for obtaining is that, used as the hardness of the aluminium alloy, its result is as shown in table 2.
The method of testing according to specified in ISO 6892-1, using omnipotent mechanics machine to embodiment 1-5 and contrast
Aluminium alloy obtained in example 1-4 carries out tension test, obtains yield strength, is used to react the mechanical strength of aluminum alloy materials.Wherein,
Yield strength is the yield limit for producing 0.2% residual deformation, and its result is as shown in table 2.
Aluminium alloy to embodiment 1-5 and comparative example 1-4 carries out heat conductivility test.According in ASTM E 1461-0
The method of testing of regulation, use laser shine method to a diameter of 12.7mm and thickness for the aluminium alloy disk of 3mm is tested, its
Result is as shown in table 2.
The performance test table of table 2
Refer to table 2, embodiment 1-5 is contrasted knowable to, to a certain extent, with the increase of silicon and copper content,
The hardness increase of aluminium alloy, crocking resistance and mechanical strength strengthen.Embodiment 3 is carried out into contrast with comparative example 1-3 can see
Go out, when without praseodymium, scandium, four kinds of rare earth metals of holmium and yttrium or during containing only a portion, the hardness of aluminium alloy, being bent in aluminium alloy
Take intensity and thermal conductivity factor is remarkably decreased.The logical of inert gas is can also be seen that additionally, 3 will be implemented and carry out contrast with comparative example 3
The operation of cooling twice for entering and using makes crocking resistance, mechanical strength and the heat conductivility of obtained aluminium alloy to obtain
It is significant to improve.
In sum, the aluminium alloy for preparing phone housing of the embodiment of the present invention, by the content for increasing silicon and copper
The crocking resistance and mechanical strength, the less phone housing of thickness that can be prepared using the aluminium alloy of aluminium alloy are improved, is made
It can preferably be protected in the case where good heat conductivity, shield effectiveness are low to mobile phone.By add gadolinium, neodymium, samarium with
And the specific rare earth metal of four kinds of lanthanum, free electron activity is refined and promoted to crystal structure in the second phase, enhance aluminium
The mechanical strength and heat conductivility of alloy material.The impurity in alloy raw material is removed using rare earth metal simultaneously, reduces aluminium alloy
Surface tension, can further strengthen the mechanical strength of aluminium alloy.
Embodiments described above is a part of embodiment of the invention, rather than whole embodiments.Reality of the invention
The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of selected implementation of the invention
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
Every other embodiment, belongs to the scope of protection of the invention.
Claims (10)
1. a kind of aluminium alloy for preparing phone housing, it is characterised in that by weight percentage, including：Silicon 2.5-
4.5%th, copper 1-1.8%, iron 0.5-1.5%, magnesium 0.2-0.4%, boron 0.06-0.08%, titanium 0.04-0.09%, zirconium 0.04-
0.08%th, vanadium 0.03-0.08%, gadolinium 0.01-0.02%, neodymium 0.01-0.02%, samarium 0.01-0.02%, lanthanum 0.01-0.03%,
Balance of aluminium.
2. the aluminium alloy for preparing phone housing according to claim 1, it is characterised in that by weight percentage,
The total content of the gadolinium and the neodymium is 0.025-0.035%.
3. the aluminium alloy for preparing phone housing according to claim 1, it is characterised in that by weight percentage,
The total content of the neodymium, the samarium and the lanthanum is 0.035-0.065%.
4. the aluminium alloy for preparing phone housing according to claim 1, it is characterised in that by weight percentage,
The content of the silicon is 2.75-4.25%.
5. the aluminium alloy for preparing phone housing according to claim 1, it is characterised in that by weight percentage,
The content of the copper is 1.2-1.6%.
6. a kind of preparation method of aluminium alloy for preparing phone housing as described in claim any one of 1-5, its feature
It is, including：
Weigh raw material in proportion, the raw material melted in container, from container bottom to melt in be passed through preheating 2-3min after
Inert gas stand 30-40min and scum silica frost is fully floated on surface, skim to be incubated after the scum silica frost and stand 10-20min, pour
Type casting moulding obtains aluminium alloy cast ingot；
The aluminium alloy cast ingot is carried out into hot extrusion, Quenching Treatment and Ageing Treatment successively；The temperature of hot extrusion
It it is 345-355 DEG C, speed is 0.5-0.8m/min；The temperature of Quenching Treatment is 480-510 DEG C；The temperature of Ageing Treatment is 165-
180℃。
7. the preparation method for preparing the aluminium alloy of phone housing according to claim 6, it is characterised in that at quenching
Reason includes cooling operation for the first time and second cooling operation successively, and cooling operation for the first time is by aluminium alloy cast ingot cooling
To 300-350 DEG C, temperature fall time is 2-5min；The cooling rate of second cooling operation is 10-15 DEG C/min.
8. the preparation method for preparing the aluminium alloy of phone housing according to claim 7, it is characterised in that at quenching
Reason is also included in the insulation operation carried out before cooling operation for the first time, and the holding temperature for being incubated operation is 480-510 DEG C, during insulation
Between be 10-20min.
9. the preparation method for preparing the aluminium alloy of phone housing according to claim 6, it is characterised in that at timeliness
The time of reason is 2-6h.
10. the preparation method for preparing the aluminium alloy of phone housing according to claim 9, it is characterised in that timeliness
The temperature for the treatment of is 170-180 DEG C, and the time of Ageing Treatment is 3-6h.
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