CN105112737A - High-heat-conductivity corrosion-resistant die-cast aluminum alloy and preparing technique thereof - Google Patents
High-heat-conductivity corrosion-resistant die-cast aluminum alloy and preparing technique thereof Download PDFInfo
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Abstract
The invention discloses high-heat-conductivity corrosion-resistant die-cast aluminum alloy. The high-heat-conductivity corrosion-resistant die-cast aluminum alloy comprises, by weight, 1.5%-5% of Si, 1.0%-3% of Mg, 0.01%-0.5% of Zn, 0.05%-0.1% of Sr and the balance aluminum and other impurity elements. The content of the other impurity elements is smaller than 0.005%. After pure aluminum is molten, corresponding intermediate alloy is added according to the composition proportion, refining is conducted at the temperature of 750 DEG C by means of a specialized refining agent, the temperature is decreased to 730 DEG C after stirring is conducted sufficiently, and standing is conducted for 10 min. An Al-Ti-B modificator is used for modification. According to the high-heat-conductivity corrosion-resistant die-cast aluminum alloy, at the temperature of 20 DEG C, the heat conductivity coefficient is 175-190 W/mk, the tensile strength of a die casting ranges from 170 MPa to 200 MPa, the yield strength ranges from 130 MPa to 145 MPa, the ductility is 2%-4%, and the high-heat-conductivity corrosion-resistant die-cast aluminum alloy can be applied to structural components, having high requirements for the heat conductivity coefficients and the corrosion resistance of materials, in the industries such as the automobile industry and the communication industry. Compared with conventional AD12 alloy, the high-heat-conductivity corrosion-resistant die-cast aluminum alloy has remarkable advantages on the aspect of the heat conductivity coefficient.
Description
Technical field
The present invention relates to a kind of good heat conductivity high strength, corrosion-resistant, and be suitable for novel aluminum alloy and the preparation method of die casting, belong to metal material field.
Background technology
Along with energy-saving and emission-reduction and green low-carbon demand, automobile and communications industry propose more and more higher demand to lightweighting materials and technology.Automobile and the most frequently used casting technique of communications industry spare and accessory parts are produced in die casting.The aluminum magnesium alloy component of communication, electronics and automobile industry is all towards thin-walled property, high heat conduction, corrosion-resistant future development, and this provides opportunity for Novel aluminum alloy material exploitation development.
In communications industry, along with the development of 3G and 4G communication equipment, need more more light-weighted alloy products, comprise scatterer, rack, wave filter etc. on communication base station, these products have adopted conventional aluminium diecast alloy ADC12 to produce in a large number.But along with increasing substantially and light-weighted larger demand of transmitted power, these products wish to adopt that wall thickness is thinner, the better die-cast aluminum alloy material of thermal diffusivity.LED industry is also like this, working temperature due to LED lamp has a strong impact on the work-ing life of light fixture, therefore adopt the good aluminium alloy compression casting lampshade of heat radiation to be the target that LED industry is pursued, Mitsubishi develops 5 kinds of aluminum alloy materials for this reason and replaces conventional ADC12 aluminium alloy.The develop rapidly of new-energy automobile industry also proposes new demand to the aluminium diecast alloy with high heat radiation high strength, comprise the component of controller box, these electromobiles of drive-motor and hybrid vehicle indispensability, the heat dispersion of ADC12 aluminium alloy all can not meet the demands.
At present, adopt aluminium alloy compression casting to face this larger technical difficulty in these industries, first the thermal conductivity of ADC12 die-cast aluminum alloy material only has about 90, well below 237 of fine aluminium.In addition, due to ADC12 aluminium alloy containing have an appointment about 10% Si element, cause corrosion resistance nature to decline, and anodic oxidation is difficult.
Therefore the aluminium diecast alloy development of high heat-conducting and corrosion-resistant based on reduction Si content, and will add by the approach of microalloying the element that the elements such as Mg, Zn, RE improve corrosion resistance nature and thermal diffusivity.
Summary of the invention
1, object of the present invention.
The object of this invention is to provide a kind of preparation method of novel high heat-conducting and corrosion-resistant aluminium alloy, this aluminum alloy materials is at 20 DEG C, and thermal conductivity is greater than 175W/ (m.K), and tensile strength is greater than 170Mpa, and yield strength is greater than 130MPa, and unit elongation is greater than 2%.Can be used for automobile and communications industry and thermal conductivity and erosion resistance are required, above higher structural part, compared with conventional aluminum alloys, to have the advantages such as higher thermal conductivity and erosion resistance.
2, the technical solution adopted in the present invention.
For preparing high heat-conducting and corrosion-resistant aluminium alloy, the present invention by the following technical solutions:
A kind of high heat-conducting and corrosion-resistant aluminium alloy, the component content of this aluminium alloy is: the content of content 1.5 5wt.% of Si, Mg is 1.0 3wt.%, the content of Zn is 0.01 0.5%, the content of Sr is 0.05 0.1%, and all the other are aluminium and other impurity element, and other impurity content is less than 0.005%.
At high heat-conducting and corrosion-resistant aluminium alloy of the present invention, the content of described Si is preferably 1.5 5wt.%.
At high heat-conducting and corrosion-resistant aluminium alloy of the present invention, the content of described Mg is preferably 1.0 3wt.%.
At high heat-conducting and corrosion-resistant aluminium alloy of the present invention, the content of described Zn is preferably 0.01 0.5wt.%.
At high heat-conducting and corrosion-resistant aluminium alloy of the present invention, the content of described Sr is preferably 0.05 0.1wt.%.
At high heat-conducting and corrosion-resistant aluminium alloy of the present invention, the content of described Zn is preferably 0.01 3wt.%.
At high heat-conducting and corrosion-resistant aluminium alloy of the present invention, other impurity content is less than 0.005%.
High heat-conducting and corrosion-resistant aluminum alloy Preparation Method provided by the invention, main operational steps is as follows:
According to product demand, Si element can add with pure Si or Al-Si master alloy form, Mg element can Mg ingot forms or Mg-AL master alloy form add, and Zn element can add with pure Zn or Al-Zn master alloy form, and Sr adds with master alloy Al-Sr master alloy form.Above-mentioned alloying element adds the fashionable burn out rate needing to consider alloy, ensures that the alloying element ratio after scaling loss requires within element ratio scope in patent of invention.
Batching and cleaning crucible, according to the amount wanting molten alloy, consider to calculate the quality adding alloy after burn out rate, and surface has greasy needs cleaning, and alloy pig needs are in drying in oven.Crucible will clean and dry, and prevents the ratio of melting last time heals alloy element from impacting.
Fine aluminium ingot is put into pit furnace crucible, and heating crucible carries out melting, and temperature of aluminum liquid controls between 700-730 DEG C
When temperature of aluminum liquid reaches 710 DEG C, Al-Si master alloy after drying is joined in aluminium liquid, aluminium liquid is warming up to 730 DEG C, be incubated after 10 minutes, Al-Mg, Al-Zn master alloy joined together in aluminium liquid, be incubated after 5 minutes, add Al-Sr master alloy, be incubated 15 minutes, ensure that the master alloy added all melts.
Magnesium liquid is warming up to more than 750 DEG C, starts to add aluminium alloy master alloy and carries out refining, in refining process with refining spoon stir up and down 5 minutes abundant to refining and modifying.Refining is cooled to 730 DEG C of insulations, leaves standstill, and makes inclusion float fully or sink, then carries out pulling out slag.
Go bad during temperature of aluminum liquid 730 DEG C, add AL-Ti-B alterant and carry out Metamorphism treatment, stir fully and leave standstill 15 minutes.Pull out slag after leaving standstill, remove surface scale and impurities at bottom.
By refining, rotten after temperature of aluminum liquid be down to 700 DEG C, transfer mold temperature controls between 150-200 DEG C, and regulate shot position, high pressure injection speed controls at 1-6m/s, aluminium liquid is joined in die casting machine injection mouth, then carry out injection according to the injection parameter set.
3, beneficial effect of the present invention.
Advantage of the present invention: this high heat conduction aluminium diecast alloy thermal conductivity 175-190W/mk at 20 DEG C, between die casting tensile strength 170-200MPa, between yield strength 130-145MPa, between unit elongation 2-4%, can be used for the industry such as automobile, communication on material thermal conductivity and the higher structural part of corrosion resistance nature requirement.Compared with conventional AD12 aluminium alloy, on thermal conductivity, there is obvious advantage.
Embodiment
In order to enable the auditor of Patent Office especially the public clearly understand technical spirit of the present invention and beneficial effect, applicant will elaborate below by way of example, but be not all the restriction to the present invention program to the description of embodiment, any conceive according to the present invention done be only pro forma but not substantial equivalent transformation and all should be considered as technical scheme category of the present invention.
Embodiment 1
1:50kgAl-2Si-1Mg-0.01Zn-0.05Sr high heat conduction aluminium diecast alloy, namely the component content of aluminium alloy is: 1.5wt.%Si, 1%wt.%Mg, 0.1%Zn, 0.05wt.%Sr, and all the other are aluminium, and other impurity content is less than 0.005%.
1. batching and cleaning crucible: according to the amount wanting molten alloy, considers to calculate the quality adding alloy after burn out rate, and surface has greasy needs cleaning, and alloy pig needs are in drying in oven.Crucible will clean and dry, and prevents the ratio of melting last time heals alloy element from impacting.
2. aluminium ingot fusing: fine aluminium ingot is put into pit furnace crucible, and heating crucible carries out melting, and temperature of aluminum liquid controls between 700-730 DEG C
3. add master alloy: when temperature of aluminum liquid reaches 710 DEG C, Al-Si master alloy after drying is joined in aluminium liquid, aluminium liquid is warming up to 730 DEG C, be incubated after 10 minutes, Al-Mg, Al-Zn master alloy joined together in aluminium liquid, be incubated after 5 minutes, add Al-Sr master alloy, be incubated 15 minutes, ensure that the master alloy added all melts.
4. refining treatment: magnesium liquid is warming up to more than 750 DEG C, starts to add aluminium alloy master alloy and carries out refining, in refining process with refining spoon stir up and down 5 minutes abundant to refining and modifying.Refining is cooled to 730 DEG C of insulations, leaves standstill, and makes inclusion float fully or sink, then carries out pulling out slag.
5. Metamorphism treatment: go bad during temperature of aluminum liquid 730 DEG C, adds AL-Ti-B alterant and carries out Metamorphism treatment, stirs fully and leaves standstill 15 minutes.Pull out slag after leaving standstill, remove surface scale and impurities at bottom.
6. die casting: by refining, rotten after temperature of aluminum liquid be down to 700 DEG C, transfer mold temperature controls between 150-200 DEG C, and regulate shot position, high pressure injection speed controls at 1-6m/s, aluminium liquid is joined in die casting machine injection mouth, then carry out injection according to the injection parameter set.
Al-1.5Si-1Mg-0.1Zn-0.05Sr height heat-conducting and corrosion-resistant cast aluminium alloy of the present invention, thermal conductivity is 185W/mk, tensile strength 185MPa, yield strength 135MPa, unit elongation 3%.
Embodiment 2
50kgAl-3Si-2Mg-0.3Zn-0.07Sr height heat conduction aluminium diecast alloy, namely the component content of aluminium alloy is: 3wt.%Si, 2.5%wt.%Mg, 0.3%Zn, 0.07wt.%Sr, and all the other are aluminium, and other impurity content is less than 0.005%.
1. batching and cleaning crucible: according to the amount wanting molten alloy, considers to calculate the quality adding alloy after burn out rate, and surface has greasy needs cleaning, and alloy pig needs are in drying in oven.Crucible will clean and dry, and prevents the ratio of melting last time heals alloy element from impacting.
2. aluminium ingot fusing: fine aluminium ingot is put into pit furnace crucible, and heating crucible carries out melting, and temperature of aluminum liquid controls between 710-730 DEG C
3. add master alloy: when temperature of aluminum liquid reaches 710 DEG C, Al-Si master alloy after drying is joined in aluminium liquid, aluminium liquid is warming up to 730 DEG C, be incubated after 10 minutes, Al-Mg, Al-Zn master alloy joined together in aluminium liquid, be incubated after 5 minutes, add Al-Sr master alloy, be incubated 15 minutes, ensure that the master alloy added all melts.
4. refining treatment: magnesium liquid is warming up to more than 750 DEG C, starts to add aluminium alloy master alloy and carries out refining, in refining process with refining spoon stir up and down 5 minutes abundant to refining and modifying.Refining is cooled to 730 DEG C of insulations, leaves standstill, and makes inclusion float fully or sink, then carries out pulling out slag.
5. Metamorphism treatment: go bad during temperature of aluminum liquid 730 DEG C, adds AL-Ti-B alterant and carries out Metamorphism treatment, stirs fully and leaves standstill 15 minutes.Pull out slag after leaving standstill, remove surface scale and impurities at bottom.
6. die casting: by refining, rotten after temperature of aluminum liquid be down to 700 DEG C, transfer mold temperature controls between 150-200 DEG C, and regulate shot position, high pressure injection speed controls at 1-6m/s, aluminium liquid is joined in die casting machine injection mouth, then carry out injection according to the injection parameter set.
Al-3Si-2.5Mg-0.3Zn-0.07Sr height heat-conducting and corrosion-resistant cast aluminium alloy of the present invention, thermal conductivity is 190W/mk, tensile strength 195MPa, yield strength 140MPa, unit elongation 4%.
Embodiment 3
50kgAl-4Si-2.5Mg-0.4Zn-0.08Sr height heat conduction aluminium diecast alloy, namely the component content of aluminium alloy is: 5wt.%Si, 3%wt.%Mg, 0.5%Zn, 0.1wt.%Sr, and all the other are aluminium, and other impurity content is less than 0.005%.
1. batching and cleaning crucible: according to the amount wanting molten alloy, considers to calculate the quality adding alloy after burn out rate, and surface has greasy needs cleaning, and alloy pig needs are in drying in oven.Crucible will clean and dry, and prevents the ratio of melting last time heals alloy element from impacting.
2. aluminium ingot fusing: fine aluminium ingot is put into pit furnace crucible, and heating crucible carries out melting, and temperature of aluminum liquid controls between 710-730 DEG C
3. add master alloy: when temperature of aluminum liquid reaches 710 DEG C, Al-Si master alloy after drying is joined in aluminium liquid, aluminium liquid is warming up to 730 DEG C, be incubated after 10 minutes, Al-Mg, Al-Zn master alloy joined together in aluminium liquid, be incubated after 5 minutes, add Al-Sr master alloy, be incubated 15 minutes, ensure that the master alloy added all melts.
4. refining treatment: magnesium liquid is warming up to more than 750 DEG C, starts to add aluminium alloy master alloy and carries out refining, in refining process with refining spoon stir up and down 5 minutes abundant to refining and modifying.Refining is cooled to 730 DEG C of insulations, leaves standstill, and makes inclusion float fully or sink, then carries out pulling out slag.
5. Metamorphism treatment: go bad during temperature of aluminum liquid 730 DEG C, adds AL-Ti-B alterant and carries out Metamorphism treatment, stirs fully and leaves standstill 15 minutes.Pull out slag after leaving standstill, remove surface scale and impurities at bottom.
6. die casting: by refining, rotten after temperature of aluminum liquid be down to 700 DEG C, transfer mold temperature controls between 150-200 DEG C, and regulate shot position, high pressure injection speed controls at 1-6m/s, aluminium liquid is joined in die casting machine injection mouth, then carry out injection according to the injection parameter set.
Al-4Si-2.5Mg-0.4Zn-0.08Sr height heat-conducting and corrosion-resistant cast aluminium alloy of the present invention, thermal conductivity is 180W/mk, tensile strength 200MPa, yield strength 145MPa, unit elongation 2%.
Specific experiment effect is as follows:
Claims (8)
1. one kind high heat-conducting and corrosion-resistant aluminium alloy, the component content of this aluminium alloy is: content 1.5 5wt.% of Si, the content of Mg is 1.0 3wt.%, the content of Zn is 0.01 0.5wt.%, the content of Sr is 0.05 0.1wt.%, all the other are aluminium and other impurity element, and other impurity content is less than 0.005%.
2. high heat-conducting and corrosion-resistant aluminium diecast alloy according to claim 1, is characterized in that: the content of described Si is 2 4wt.%.
3. high heat-conducting and corrosion-resistant aluminium diecast alloy according to claim 1, is characterized in that: the content of described Mg is 1.0 2.5wt.%.
4. high heat-conducting and corrosion-resistant aluminium diecast alloy according to claim 1, is characterized in that: the content of described Zn is 0.01 0.4wt.%.
5. high heat-conducting and corrosion-resistant aluminium diecast alloy according to claim 1, is characterized in that: the content of described Sr is 0.05 0.08wt.%.
6. high heat-conducting and corrosion-resistant aluminium diecast alloy according to claim 1, is characterized in that: other described impurity content is less than 0.004%.
7. high heat-conducting and corrosion-resistant aluminium diecast alloy according to claim 1, it is characterized in that: according to product demand, Si element can add with pure Si or Al-Si master alloy form, Mg element can Mg ingot forms or Mg-AL master alloy form add, Zn element can add with pure Zn or Al-Zn master alloy form, Sr adds with master alloy Al-Sr master alloy form, above-mentioned alloying element adds the fashionable burn out rate needing to consider alloy, ensures that the alloying element ratio after scaling loss requires within element ratio scope in patent of invention.
8. use the arbitrary described a kind of preparation method preparing high heat-conducting and corrosion-resistant aluminium alloy of claim 1-7, it is characterized in that carrying out according to following steps:
(1) batching and cleaning crucible, according to the amount wanting molten alloy, calculates the quality adding alloy after considering burn out rate, surface has greasy needs cleaning, alloy pig needs in drying in oven, and crucible will clean and dry, and prevents the ratio of melting last time heals alloy element from impacting;
(2) aluminium ingot fusing: fine aluminium ingot is put into pit furnace crucible, and heating crucible carries out melting, and temperature of aluminum liquid controls between 700-730 DEG C;
(3) master alloy is added: when temperature of aluminum liquid reaches 710 DEG C, Al-Si master alloy after drying is joined in aluminium liquid, aluminium liquid is warming up to 730 DEG C, be incubated after 10 minutes, Al-Mg, Al-Zn master alloy joined together in aluminium liquid, be incubated after 5 minutes, add Al-Sr master alloy, be incubated 15 minutes, ensure that the master alloy added all melts;
(4) refining: more than 750 DEG C, liquid aluminium, start to add aluminium alloy master alloy and carry out refining, in refining process with refining spoon stir up and down 5 minutes abundant to refining and modifying, refining is cooled to 730 DEG C of insulations, standing, make inclusion float fully or sink, then carry out pulling out slag;
(5) rotten: to go bad during temperature of aluminum liquid 730 DEG C, add AL-Ti-B alterant and carry out Metamorphism treatment, stir fully and leave standstill 15 minutes, after leaving standstill, pull out slag, remove surface scale and impurities at bottom;
(6) pour into a mould: by refining, rotten after temperature of aluminum liquid be down to 700 DEG C, transfer mold temperature controls between 150-200 DEG C, and regulate shot position, high pressure injection speed controls at 1-6m/s, aluminium liquid is joined in die casting machine injection mouth, then carry out injection according to the injection parameter set.
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| CN106636787A (en) * | 2016-11-14 | 2017-05-10 | 苏州慧驰轻合金精密成型科技有限公司 | High-toughness die-casting aluminum alloy and preparation method thereof |
| CN106636787B (en) * | 2016-11-14 | 2018-05-25 | 苏州慧驰轻合金精密成型科技有限公司 | A kind of high tenacity pack alloy and preparation method thereof |
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Application publication date: 20151202 |