CN104213003A - Medium-strength aluminum alloy monofilament with electric conductivity of 61% IACS and preparation method thereof - Google Patents
Medium-strength aluminum alloy monofilament with electric conductivity of 61% IACS and preparation method thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a medium-strength aluminum alloy monofilament with an electric conductivity of 61% IACS. Micro alloying elements of Si, Ti, V, Mo, La and Be are added to adjust the contents of all the components; the contents of impurity elements in the alloy are controlled; the microstructure of the alloy is adjusted through a heat treatment process; and the medium-strength aluminum alloy monofilament with high electric conductivity is prepared. The experimental result shows that the tensile strength of the medium-strength aluminum alloy monofilament with the electric conductivity of 61% IACS is 250 MPa and the ductility thereof is 3.5%.
Description
Technical field
The present invention relates to technical field of aluminum alloy technology, particularly relating to a kind of electric conductivity is middle strength aluminum alloy monofilament of 61%IACS and preparation method thereof.
Background technology
Along with the fast development of China's economic construction and electricity needs rise year by year, how to make full use of existing lining corridor and line facility, as far as possible carry electricity more, reduce line loss, improve power transmission efficiency and become the problem that operation power department must consider.
At present, the present situation of China's overhead transmission line conductor is based on Aluminium Cable Steel Reinforced, manufacture large section Aluminium Cable Steel Reinforced mode according to increase sectional area of wire and improve transmission capacity, the shaft tower must building more high strength realizes, and not only increases line corridor area but also strengthens construction cost, not meeting the guilding principle of " resource-conserving; environmentally friendly; new technology, novel material, novel process " transmission line construction.
In order to solve the reducing energy consumption of transmitting line, reducing transmission of electricity line loss, improving the circuit life-span, adopting all aluminum alloy conductor of high conductivity to substitute Aluminium Cable Steel Reinforced, to realize the energy-saving and cost-reducing of transmitting line be one of trend of development.But domestic high-strength all aluminum alloy conductor electric conductivity is lower, and line loss is larger; Though and domestic in strong all aluminum alloy conductor electric conductivity promote to some extent than high-strength all aluminum alloy conductor, complex manufacturing, cost is high, product over-all properties with also there is larger gap abroad.
In prior art, aluminium alloy and preparation method thereof obtains to be reported widely, such as, application number be 201010290234.6 Chinese patent literature report a kind of special soft aluminium alloy conductor and preparation method thereof, by weight percentage, the Fe of consisting of of this aluminum-alloy conductor material: 0.3 ~ 1.5wt%, the Be of 0.001 ~ 0.3wt%, the Cu of 0.005 ~ 0.6wt %, the rare earth of 0.1 ~ 1.5wt %, content≤the 0.08wt% of Si, the total content≤0.15wt% of inevitable impurity, all the other are aluminium.Application number be 201010286764.3 Chinese patent literature report a kind of cable heat resistant type aluminum-alloy conductor material and preparation method thereof, the composition of this aluminium alloy and weight percentage are: the Fe of 0.3 ~ 1.0wt %, the Cu of 0.01 ~ 0.3wt %, the Mg of 0.01 ~ 0.3wt%, Ca, Mo, one in Sb, two or three, total amount is 0.01 ~ 0.3wt%, the rare earth element of 0.05 ~ 0.8wt%, rare earth element is by Sc, one or more compositions in Y and Er, Si≤0.1wt%, other content of impurities≤0.15wt%, all the other are Al.But, electric conductivity and the tensile strength of the above-mentioned aluminium alloy reported are lower, therefore, developing strength aluminum alloy conductor material and wire thereof in high conductivity (>=59.2%IACS) is the trend of current domestic all aluminum alloy conductor technical development and technical barrier urgently to be resolved hurrily.
Summary of the invention
The technical problem that invention solves is to provide a kind of electric conductivity to be middle strength aluminum alloy monofilament of 61%IACS and preparation method thereof, and tensile strength is 250MPa, and unit elongation is 3.5%.
In view of this, the invention provides the middle strength aluminum alloy monofilament that a kind of electric conductivity is 61%IACS, comprise following composition:
Si 0.02 wt％~ 0.09 wt％；
Ti 0.18wt％~0.35 wt％；
V 0.05 wt％~ 0.12wt％；
Mo 0.08 wt％~0.15wt％；
La 0.1 wt％~0.2 wt％；
Be 0.01 wt％~0.2wt％；
Surplus is Al and inevitable impurity.
Preferably, following composition is comprised:
Si 0.04 wt％~ 0.08 wt％；
Ti 0.2wt％~0.3 wt％；
V 0.08 wt％~ 0.12wt％；
Mo 0.09 wt％~0.14wt％；
La 0.12 wt％~0.17 wt％；
Be 0.05 wt％~0.1wt％；
Surplus is Al and inevitable impurity.
Preferably, following composition is comprised:
Si 0.05 wt％~ 0.07 wt％；
Ti 0.22wt％~0.28 wt％；
V 0.09 wt％~ 0.11wt％；
Mo 0.1 wt％~0.14wt％；
La 0.14 wt％~0.16 wt％；
Be 0.07 wt％~0.09wt％；
Surplus is Al and inevitable impurity.
Accordingly, the present invention also provides a kind of electric conductivity to be the preparation method of the middle strength aluminum alloy monofilament of 61%IACS, comprises the following steps:
Step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 700 ~ 740 DEG C, dehydrogenation after stirring, slagging-off, and at 700 ~ 740 DEG C, alloying 30 ~ 70min, obtains mixed solution;
Described mixed solution, by insulation behind mould and die preheating to 220 ~ 240 DEG C, is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion by step b);
Described aluminium alloy rod is carried out wire drawing by step c), obtains the middle strength aluminum alloy monofilament of high conductivity.
Preferably, in step a, churning time is 8 ~ 20min.
Preferably, step a interalloy temperature is 720 ~ 740 DEG C.
Preferably, step a interalloy temperature is 730 ~ 740 DEG C.
Preferably, the step a interalloy time is 40 ~ 60min.
Preferably, in step b, the preheating temperature of mould is 230 ~ 240 DEG C.
Preferably, in step b, soaking time is 5 ~ 20min.
The invention provides the preparation method that a kind of electric conductivity is the middle strength aluminum alloy monofilament of 61%IACS, comprise the following steps: step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 700 ~ 740 DEG C, dehydrogenation after stirring, slagging-off, at 700 ~ 740 DEG C, alloying 30 ~ 70min, obtains mixed solution; Described mixed solution, by insulation behind mould and die preheating to 220 ~ 240 DEG C, is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion by step b); Described aluminium alloy rod is carried out wire drawing by step c), obtains middle strength aluminum alloy monofilament.Compared with prior art, the present invention is by adding micro-alloying elements Si, Ti, V, Mo, La, Be, adjust the content of each composition, and control impurity content in alloy, and the microtexture of alloy is adjusted by thermal treatment process, prepare the middle strength aluminum alloy monofilament with high conductivity.Experimental result shows, electric conductivity prepared by the present invention is the tensile strength of the middle strength aluminum alloy monofilament of 61%IACS is 250MPa, and unit elongation is 3.5%.
Embodiment
In order to understand the present invention further, below in conjunction with embodiment, the preferred embodiment of the invention is described, but should be appreciated that these describe just for further illustrating the features and advantages of the present invention, instead of limiting to the claimed invention.
The embodiment of the invention discloses the middle strength aluminum alloy monofilament that a kind of electric conductivity is 61%IACS, comprise following composition:
Si 0.02 wt％~ 0.09 wt％；
Ti 0.18wt％~0.35 wt％；
V 0.05 wt％~ 0.12wt％；
Mo 0.08 wt％~0.15wt％；
La 0.1 wt％~0.2 wt％；
Be 0.01 wt％~0.2wt％；
Surplus is Al and inevitable impurity.
Preferably, described middle strength aluminum alloy monofilament comprises following composition:
Si 0.04 wt％~ 0.08 wt％；
Ti 0.2wt％~0.3 wt％；
V 0.08 wt％~ 0.12wt％；
Mo 0.09 wt％~0.14wt％；
La 0.12 wt％~0.17 wt％；
Be 0.05 wt％~0.1wt％；
Surplus is Al and inevitable impurity.
Preferred, described middle strength aluminum alloy monofilament comprises following composition:
Si 0.05 wt％~ 0.07 wt％；
Ti 0.22wt％~0.28 wt％；
V 0.09 wt％~ 0.11wt％；
Mo 0.1 wt％~0.14wt％；
La 0.14 wt％~0.16 wt％；
Be 0.07 wt％~0.09wt％；
Surplus is Al and inevitable impurity.
Accordingly, the present invention also provides the electric conductivity described in a kind of technique scheme to be the preparation method of the middle strength aluminum alloy monofilament of 61%IACS, comprises the following steps:
Step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 700 ~ 740 DEG C, dehydrogenation after stirring, slagging-off, and at 700 ~ 740 DEG C, alloying 30 ~ 70min, obtains mixed solution;
Described mixed solution, by insulation behind mould and die preheating to 220 ~ 240 DEG C, is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion by step b);
Described aluminium alloy rod is carried out wire drawing by step c), obtains the middle strength aluminum alloy monofilament of high conductivity.
As can be seen from technique scheme, the present invention is by adding micro-alloying elements Si, Ti, V, Mo, La, Be, adjust the content of each composition, and control impurity content in alloy, and the microtexture of alloy is adjusted by thermal treatment process, prepare the middle strength aluminum alloy monofilament with high conductivity.
Wherein, silicon is one of prevailing alloying element of aluminium alloy, and silicon can improve castability and the welding mobility of aluminium alloy, and aluminium alloy can also be made to have higher mechanical property, because it can form some compounds in the alloy, alloy is made to become heat-treatable strengthened.Along with Si content raises, the specific conductivity of alloy declines.This is owing to improving Si content in alloy, and in aluminum substrate, free Si quantity increases, and Si is semi-conductor, much higher compared with the resistivity of aluminum substrate, and therefore the raising of Si content reduces effective conductive cross-sectional area of aluminum substrate, falls low-alloyed specific conductivity.
Ti, V have crystal grain thinning, raising aluminium alloy room temperature tensile intensity and improve the effect of thermotolerance.
Mo has the characteristic such as conduction and heat conduction that hot strength is good, hardness is high, density is large, resistance to corrosion is strong, thermal expansivity is little, good.
Rare Earth Lanthanum La plays good purification and impurity removal effect in aluminium alloy monofilament, before adding rare earth, impurity exists mainly with unbound state, after adding rare earth, rare earth and the detrimental impurity be solid-solution in aluminium define stable intermetallic compound, and separate out at crystal boundary, reduce impurity element solid solubility in the base, thus improve the electroconductibility of aluminium.But the increase of content of rare earth can make the tensile strength of bus material first raise rear reduction, in order to reach maximum tensile strength and the best electroconductibility, preferably control the consumption of Rare Earth Lanthanum La.
Be and other micro-actings in conjunction, improve the mechanical property of aluminium alloy monofilament, and erosion resistance is good, also maintains very high electroconductibility.
Preparation electric conductivity be that in the process of strength aluminum alloy monofilament in 61%IACS, in step a, churning time is preferably 8 ~ 20min, be more preferably 10 ~ 20min, be more preferably 12 ~ 18min; Alloying temperature is preferably 730 ~ 740 DEG C, is more preferably 735 ~ 740 DEG C; Alloying time is preferably 40 ~ 60min, is more preferably 50 ~ 60min, is more preferably 50 ~ 55min.
In step b, the preheating temperature of mould is preferably 230 ~ 240 DEG C, is more preferably 232 ~ 238 DEG C, is more preferably 234 ~ 236 DEG C; Soaking time is preferably 5 ~ 20min, is more preferably 8 ~ 18min, is more preferably 12 ~ 16min.
In order to understand the present invention further, be described in detail to technical scheme provided by the invention below in conjunction with embodiment, protection scope of the present invention is not limited by the following examples.
The raw material that the embodiment of the present invention adopts and chemical reagent are commercial.
Embodiment 1
Electric conductivity prepared by the present embodiment is that the composition of the middle strength aluminum alloy monofilament of 61%IACS is as follows:
Si 0.06wt％；
Ti 0.26 wt％；
V 0.1 wt％；
Mo 0.12wt％；
La 0.15wt％；
Be 0.08％；
Surplus is Al.
Preparation method is as follows:
Step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 735 DEG C, dehydrogenation after stirring, slagging-off, and alloying 60min at 735 DEG C, obtains mixed solution;
Step b) is incubated 20min by after mould and die preheating to 230 DEG C, described mixed solution is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion;
Described aluminium alloy rod is carried out wire drawing by step c), obtains middle strength aluminum alloy monofilament.
In preparing the present embodiment, strength aluminum alloy monofilament carries out Performance Detection, and result shows: electric conductivity is 61% IACS (20 DEG C), tensile strength is 250MPa, and unit elongation is 3.5%.
Embodiment 2
Electric conductivity prepared by the present embodiment is that the composition of the middle strength aluminum alloy monofilament of 61%IACS is as follows:
Si 0.08wt％；
Ti 0.20 wt％；
V 0.12 wt％；
Mo 0.15wt％；
La 0.18wt％；
Be 0.08％；
Surplus is Al.
Preparation method is as follows:
Step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 738 DEG C, dehydrogenation after stirring, slagging-off, and alloying 60min at 735 DEG C, obtains mixed solution;
Step b) is incubated 20min by after mould and die preheating to 235 DEG C, described mixed solution is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion;
Described aluminium alloy rod is carried out wire drawing by step c), obtains middle strength aluminum alloy monofilament.
In preparing the present embodiment, strength aluminum alloy monofilament carries out Performance Detection, and result shows: electric conductivity is 61% IACS (20 DEG C), tensile strength is 251MPa, and unit elongation is 3.5%.
Embodiment 3
Electric conductivity prepared by the present embodiment is that the composition of the middle strength aluminum alloy monofilament of 61%IACS is as follows:
Si 0.06wt％；
Ti 0.35 wt％；
V 0.06 wt％；
Mo 0.08wt％；
La 0.15wt％；
Be 0.08％；
Surplus is Al.
Preparation method is as follows:
Step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 733 DEG C, dehydrogenation after stirring, slagging-off, and alloying 60min at 733 DEG C, obtains mixed solution;
Step b) is incubated 20min by after mould and die preheating to 230 DEG C, described mixed solution is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion;
Described aluminium alloy rod is carried out wire drawing by step c), obtains middle strength aluminum alloy monofilament.
In preparing the present embodiment, strength aluminum alloy monofilament carries out Performance Detection, and result shows: electric conductivity is 61% IACS (20 DEG C), tensile strength is 251MPa, and unit elongation is 3.6%.
The explanation of above embodiment just understands method of the present invention and core concept thereof for helping.It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also carry out some improvement and modification to the present invention, these improve and modify and also fall in the protection domain of the claims in the present invention.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. electric conductivity is a middle strength aluminum alloy monofilament of 61%IACS, it is characterized in that, comprises following composition:
Si 0.02 wt％~ 0.09 wt％；
Ti 0.18wt％~0.35 wt％；
V 0.05 wt％~ 0.12wt％；
Mo 0.08 wt％~0.15wt％；
La 0.1 wt％~0.2 wt％；
Be 0.01 wt％~0.2wt％；
Surplus is Al and inevitable impurity.
2. middle strength aluminum alloy monofilament according to claim 1, is characterized in that, comprise following composition:
Si 0.04 wt％~ 0.08 wt％；
Ti 0.2wt％~0.3 wt％；
V 0.08 wt％~ 0.12wt％；
Mo 0.09 wt％~0.14wt％；
La 0.12 wt％~0.17 wt％；
Be 0.05 wt％~0.1wt％；
Surplus is Al and inevitable impurity.
3. middle strength aluminum alloy monofilament according to claim 2, is characterized in that, comprise following composition:
Si 0.05 wt％~ 0.07 wt％；
Ti 0.22wt％~0.28 wt％；
V 0.09 wt％~ 0.11wt％；
Mo 0.1 wt％~0.14wt％；
La 0.14 wt％~0.16 wt％；
Be 0.07 wt％~0.09wt％；
Surplus is Al and inevitable impurity.
4. the electric conductivity described in claim 1 ~ 3 any one is a preparation method for the middle strength aluminum alloy monofilament of 61%IACS, it is characterized in that, comprises the following steps:
Step a) adds Si, Ti, V, Mo, La, Be successively after being melted by aluminium ingot at 700 ~ 740 DEG C, dehydrogenation after stirring, slagging-off, and at 700 ~ 740 DEG C, alloying 30 ~ 70min, obtains mixed solution;
Described mixed solution, by insulation behind mould and die preheating to 220 ~ 240 DEG C, is poured into obtained aluminium ingot in mould, obtains aluminium alloy rod after hot extrusion by step b);
Described aluminium alloy rod is carried out wire drawing by step c), obtains middle strength aluminum alloy monofilament.
5. the preparation method as described in claim 4, is characterized in that, in step a, churning time is 8 ~ 20min.
6. the preparation method as described in claim 4, is characterized in that, step a interalloy temperature is 720 ~ 740 DEG C.
7. the preparation method as described in claim 6, is characterized in that, step a interalloy temperature is 730 ~ 740 DEG C.
8. the preparation method as described in claim 4, is characterized in that, the step a interalloy time is 40 ~ 60min.
9. the preparation method as described in claim 4, is characterized in that, in step b, the preheating temperature of mould is 230 ~ 240 DEG C.
10. the preparation method as described in claim 4, is characterized in that, in step b, soaking time is 5 ~ 20min.
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