CN105274397A - High-strength super-heat-resistant aluminum-alloy conductor and preparation method thereof - Google Patents
High-strength super-heat-resistant aluminum-alloy conductor and preparation method thereof Download PDFInfo
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- CN105274397A CN105274397A CN201510698345.3A CN201510698345A CN105274397A CN 105274397 A CN105274397 A CN 105274397A CN 201510698345 A CN201510698345 A CN 201510698345A CN 105274397 A CN105274397 A CN 105274397A
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Abstract
The invention discloses a high-strength super-heat-resistant aluminum-alloy conductor and a preparation method thereof. The aluminum-alloy conductor comprises the chemical components including, by mass, 0.01-0.18% of Sc, 0.06-0.5% of Zr, the balance Al and inevitable impurity elements. The preparation method of the high-strength super-heat-resistant aluminum-alloy conductor comprises the steps that 1, pure molten aluminum with the purity being not lower than 99.7%, Al-Sc intermediate alloy and Al-Zr intermediate alloy are adopted to be molten for preparing an alloy melt; 2, the alloy melt is poured into an inlet of a continuous rheological extrusion machine, and an aluminum alloy conductive rod is prepared through continuous rheological extrusion; and 3, cold-drawing machining is performed on the aluminum alloy conductive rod, and finally the high-strength super-heat-resistant aluminum-alloy conductor with the diameter being 0.5-10 mm is obtained. According to the obtained aluminum-alloy conductor with the diameter being 3 mm, the tensile strength reaches 211 MPa, the elongation reaches 7.6%, the equivalent conductivity at the temperature of 20 DEG C is higher than 60% IACS, the 230 DEG C*1h strength survival rate is higher than 97%, and the 400 DEG C*1h strength survival rate is higher than 95%. According to design and machining of alloy components, the high-strength super-heat-resistant aluminum-alloy conductor is high in conductivity and strength and good in heat resistance.
Description
Technical field
The present invention relates to a kind of high-strength special heat-resistant aluminum alloy wire and preparation method thereof, belong to materials processing technology field.
Background technology
Along with Chinese society rapid economic development, power demand also increases sharply, and in order to the transferring electricity from the west to the east of satisfied country, north and south intercommunication, on national network strategic plan, electric wire is as the base mateiral of power industry, and its demand grows with each passing day.At present, the high pressure overhead power line wire of China generally adopts Aluminium Cable Steel Reinforced, but the weight of Aluminium Cable Steel Reinforced is large, resistance toheat is poor, current capacity is restricted, energy loss large, can not meet the needs of electric power development.Heat-resistant aluminum alloy wire has the advantages such as lightweight, sag is little, good heat resistance, current capacity are large, this wire from the 1950's just use in the world, be particularly suitable for supertension line and large cross line, when line-sag is identical, the span that can increase steel tower or the height reducing steel tower are to reduce land seizure and line construction cost, but the rate of utilization of the heat-resistant aluminum alloy wire of China is very low.At present, the subject matter of domestic heat-resistant aluminum alloy wire is conductivity, the aspect such as resistance toheat and mechanical property can not be taken into account.
Hot strength and recrystallization temperature that Sc element can significantly improve aluminium alloy is added, because Sc can form stable Al with Al in aluminium alloy
3sc phase, Al
3the mismatch of Sc phase and aluminum substrate is less, can effective inhibiting grain growth, improves the hot strength of Al alloy; Al
3sc phase can effectively pin dislocation, subgrain boundary and crystal boundary, can hinder growing up of Recrystallization nucleation core in Recovery Process, thus effectively hinders the generation of recrystallize, improves recrystallization temperature.But Sc is expensive, increase substantially the cost of alloy lead wire.Zr element have much identical feature with Sc unit, and usually add in aluminium alloy by Sc, Zr compound, Zr can replace Al
3sc atom in Sc phase, forms the Al that thermostability is higher
3(Sc, Zr) phase, and Al
3the strengthening effect of (Sc, Zr) phase is better than Al
3sc phase, further increases recrystallization temperature and the tensile strength of alloy; And the relative Sc of the price of Zr is cheaply a lot, adds the content that Zr reduces Sc in alloy, low-alloyed cost can be fallen.
Summary of the invention
For the problems referred to above, the present invention proposes a kind of high-strength special heat-resistant aluminum alloy wire and preparation method thereof, devises alloying constituent, becomes extrusion process and prepares aluminium alloy rod, then prepare high-strength special heat-resistant aluminum alloy wire by drawing by Continuous Flow.
For achieving the above object, the technical solution used in the present invention is: a kind of high-strength special heat-resistant aluminum alloy wire, its chemical composition and mass percent are: Sc:0.01-0.18%, Zr:0.06-0.5%, all the other are Al and inevitable impurity element, and wherein in inevitable impurity element, often kind of impurity content is no more than 0.08% of material total mass.
A preparation method for high-strength special heat-resistant aluminum alloy wire, comprises the following steps:
(1) melting: adopt electrolytic aluminum water or fine aluminium ingot, be heated 700-750 DEG C, master alloy is added melt, after alloy melts completely, melt temperature is increased to 700-750 DEG C, and is incubated 5-10min, then with refining agent, refining is carried out to melt, after skimming, argon gas is passed into melt and carry out refining 5-15min, finally melt is incubated 5-15min at 700-750 DEG C;
(2) Continuous Flow becomes extrusion molding: the entrance at 650-750 DEG C, melt cast being become extrusion machine to Continuous Flow, prepares the aluminium alloy conducting rod that diameter is 5-20mm;
(3) drawing: adopt sintered carbide die to carry out cold-drawn processing to aluminium alloy conducting rod, obtaining diameter is the high-strength special heat-resistant aluminum alloy wire of 0.5-10mm.
As preferably, electrolytic aluminum water described in step (1) or fine aluminium ingot purity are not less than 99.7%.
As preferably, master alloy described in step (1) is Al-Sc master alloy and Al-Zr master alloy.
As preferably, described in step (1), refining agent is aluminum refining agent and C
2cl
6.
As preferably, the pressure passing into argon gas described in step (1) is 1.0-4.0MPa, and flow is 3.0-5.5L/min.
As preferably, described in step (2), the processing parameter of continuous rheo-extrusion is: extrusion roll rotating speed is 20-100r/min, and rheo-extrusion shaping teeming temperature is 650-750 DEG C.
As preferably, described in step (3), the drawing speed of Cold Drawing Process is: 0.1-1m/s.
Beneficial effect of the present invention is:
The present invention compared with prior art, has following distinguishing feature:
(1) while ensureing wire electric conductivity, effectively improve tensile strength and the unit elongation of wire, aluminium alloy conductor prepared by the present invention 20 DEG C of equivalent conductivities are 60.2%IACS, tensile strength is 211MPa, and elongation is 7.6%, is significantly better than the performance of existing heat-resistant aluminum alloy wire;
(2) the intensity survival rate of alloy lead wire after 230 DEG C × 1h is higher than 97%, and the intensity survival rate after 400 DEG C × 1h is higher than 95%, and long-time running temperature can reach more than 230 DEG C, improves the operating temperature of wire;
(3) the present invention adopts continuous rheo-extrusion to prepare aluminium alloy rod, and technical process is short, and cost is low, good product performance, is easy to realize suitability for industrialized production.
Accompanying drawing explanation
Fig. 1 is the TEM microtexture metallograph of heat-resistant aluminum alloy wire prepared by the present invention.
Embodiment
As shown in Figure 1: the wherein TEM microtexture of Al-Sc-Zr alloy conductive bar prepared for rheo-extrusion of Fig. 1 (a), as can be seen from the figure Al-Sc-Zr alloy lead wire inner homogeneous is dispersed with the Al of a large amount of nano-scale
3(Sc, Zr) precipitated phase, Al
3(Sc, Zr) mutually can pinning dislocation consumingly, has obvious precipitation strength effect, and Al
3(Sc, Zr) at high temperature has satisfactory stability mutually, improves the resistance toheat of alloy lead wire; Fig. 1 (b)-(d) is the TEM microtexture of the alloy lead wire of different drawing deformation amount, find that the dislocation desity of alloy lead wire inside increases along with the increase of drawing deformation amount more afterwards, and the size of precipitated phase and pattern do not change in drawing deformation process, through the coupling and intensifying effect of dislocation and precipitated phase, the intensity of alloy lead wire improves further.
The chemical composition of high-strength special heat-resistant aluminum alloy wire is: a Sc0.1%, Zr0.15%, and surplus is Al and inevitable impurity element, and often kind of impurity content is no more than 0.08% of total mass.
A kind of preparation process of high-strength special heat-resistant aluminum alloy wire is as follows:
The first step, according to the alloying constituent of above-mentioned high-strength special heat-resistant aluminum alloy wire, adopt purity be not less than 99.7% electrolytic aluminum water, Al-2Sc (wt.%) master alloy and Al-5Zr (wt.%) master alloy batching.Add Al-Sc master alloy and Al-Zr master alloy when aluminium water temp is 700-750 DEG C, then stir melt and be incubated 10min;
Second step, after alloy all melts, adds C at 700-750 DEG C in alloy melt
2cl
6carry out slagging-off degasification, pass into argon gas refining 10min after skimming, the pressure of argon gas is 2.5MPa, and flow is 4.2L/min, after skimming, melt is heated to 700-750 DEG C of insulation 10min;
3rd step, is 30r/min at extrusion roll rotating speed, when melt temperature is 700-750 DEG C, alloy melt is poured into the entrance that Continuous Flow becomes extrusion machine, prepares the aluminium alloy conducting rod that diameter is 10mm;
4th step, adopt sintered carbide die to be the aluminium alloy conductor of 3.0mm by the cold-drawn of aluminium alloy conducting rod to diameter, drawing speed is 0.2m/s.
The diameter adopting the inventive method to prepare is the aluminium alloy conductor of 3.0mm, its tensile strength is 211MPa, elongation is 7.6%, 20 DEG C of equivalent conductivities are 60.2%IACS, the intensity survival rate of 230 DEG C × 1h is 97.5%, the intensity survival rate of 400 DEG C × 1h is 95.3%, and long-time running temperature reaches more than 230 DEG C, belongs to high-strength special heat-resistant aluminum alloy wire.
It is emphasized that: be only preferred embodiment of the present invention above, not any pro forma restriction is done to the present invention, every above embodiment is done according to technical spirit of the present invention any simple modification, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. a high-strength special heat-resistant aluminum alloy wire, is characterized in that: its chemical composition and mass percent are: Sc:0.01-0.18%, Zr:0.06-0.5%, and all the other are Al and inevitable impurity element.
2. a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 1, is characterized in that: in described inevitable impurity element, often kind of impurity content is no more than 0.08% of material total mass.
3. a preparation method for high-strength special heat-resistant aluminum alloy wire, comprises the following steps:
(1) melting: adopt electrolytic aluminum water or fine aluminium ingot, be heated 700-750 DEG C, master alloy is added melt, after alloy melts completely, melt temperature is increased to 700-750 DEG C, and is incubated 5-10min, then with refining agent, refining is carried out to melt, after skimming, argon gas is passed into melt and carry out refining 5-15min, finally melt is incubated 5-15min at 700-750 DEG C;
(2) Continuous Flow becomes extrusion molding: the entrance at 650-750 DEG C, melt cast being become extrusion machine to Continuous Flow, prepares the aluminium alloy conducting rod that diameter is 5-20mm;
(3) drawing: adopt sintered carbide die to carry out cold-drawn processing to aluminium alloy conducting rod, obtaining diameter is the high-strength special heat-resistant aluminum alloy wire of 0.5-10mm.
4. the preparation method of a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 3, is characterized in that: electrolytic aluminum water described in step (1) or fine aluminium ingot purity are not less than 99.7%.
5. the preparation method of a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 3, is characterized in that: master alloy described in step (1), is Al-Sc master alloy and Al-Zr master alloy.
6. the preparation method of a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 3, is characterized in that: described in step (1), refining agent is aluminum refining agent and C
2cl
6.
7. the preparation method of a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 3, is characterized in that: the pressure passing into argon gas described in step (1) is 1.0-4.0MPa, and flow is 3.0-5.5L/min.
8. the preparation method of a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 3, it is characterized in that: described in step (2), the processing parameter of continuous rheo-extrusion is: extrusion roll rotating speed is 20-100r/min, and rheo-extrusion shaping teeming temperature is 650-750 DEG C.
9. the preparation method of a kind of high-strength special heat-resistant aluminum alloy wire as claimed in claim 3, is characterized in that: described in step (3), the drawing speed of Cold Drawing Process is: 0.1-1m/s.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105803276A (en) * | 2016-03-24 | 2016-07-27 | 全球能源互联网研究院 | Electro-conductive filament |
| CN105821260A (en) * | 2016-05-20 | 2016-08-03 | 湖南东方钪业股份有限公司 | Aluminum, scandium and zirconium intermediate alloy for aluminum alloy and production method thereof |
| CN108265201A (en) * | 2018-02-08 | 2018-07-10 | 西北工业大学 | A kind of high-ductility Al-Mg-Sn alloys and preparation method |
| CN108796312A (en) * | 2018-07-16 | 2018-11-13 | 东北大学 | A kind of preparation method of the aluminium alloy containing spherical nanometer phase containing Fe |
| CN109136681A (en) * | 2018-09-07 | 2019-01-04 | 安徽耀强精轮机械有限公司 | 6061 aluminium casting rod material formulas of one kind and its casting technique |
| CN109402461A (en) * | 2018-12-25 | 2019-03-01 | 有研工程技术研究院有限公司 | A kind of aluminum foil material being used to prepare lightning protection aluminium net |
| CN109457145A (en) * | 2018-12-25 | 2019-03-12 | 有研工程技术研究院有限公司 | A kind of ultra-thin breadth lightning protection micropore aluminium net and preparation method thereof |
| CN110684912A (en) * | 2019-10-30 | 2020-01-14 | 镇江金鑫有色合金有限公司 | Aluminum alloy profile with composite rare earth element nanoparticles and preparation method thereof |
| CN112143943A (en) * | 2020-10-29 | 2020-12-29 | 昆明理工大学 | Preparation method of heat-resistant aluminum alloy conductor |
| CN113046583A (en) * | 2021-03-05 | 2021-06-29 | 山西一禾铝业科技新材料有限公司 | High-strength electric-conductivity heat-resistant aluminum alloy rod, preparation method and heat-resistant aluminum alloy cable |
| CN114752745A (en) * | 2022-04-16 | 2022-07-15 | 昆明理工大学 | Preparation method of high-performance ternary aluminum-zirconium alloy conducting rod |
| CN115595474A (en) * | 2022-10-25 | 2023-01-13 | 无锡华能电缆有限公司（Cn） | Super heat-resistant aluminum alloy conductor, preparation method thereof and steel-cored super heat-resistant aluminum alloy stranded wire |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105803276A (en) * | 2016-03-24 | 2016-07-27 | 全球能源互联网研究院 | Electro-conductive filament |
| CN105821260A (en) * | 2016-05-20 | 2016-08-03 | 湖南东方钪业股份有限公司 | Aluminum, scandium and zirconium intermediate alloy for aluminum alloy and production method thereof |
| CN108265201A (en) * | 2018-02-08 | 2018-07-10 | 西北工业大学 | A kind of high-ductility Al-Mg-Sn alloys and preparation method |
| CN108796312A (en) * | 2018-07-16 | 2018-11-13 | 东北大学 | A kind of preparation method of the aluminium alloy containing spherical nanometer phase containing Fe |
| CN109136681A (en) * | 2018-09-07 | 2019-01-04 | 安徽耀强精轮机械有限公司 | 6061 aluminium casting rod material formulas of one kind and its casting technique |
| CN109136681B (en) * | 2018-09-07 | 2019-12-06 | 安徽耀强精轮机械有限公司 | 6061 aluminum cast bar and casting process thereof |
| CN109457145A (en) * | 2018-12-25 | 2019-03-12 | 有研工程技术研究院有限公司 | A kind of ultra-thin breadth lightning protection micropore aluminium net and preparation method thereof |
| CN109402461A (en) * | 2018-12-25 | 2019-03-01 | 有研工程技术研究院有限公司 | A kind of aluminum foil material being used to prepare lightning protection aluminium net |
| CN110684912A (en) * | 2019-10-30 | 2020-01-14 | 镇江金鑫有色合金有限公司 | Aluminum alloy profile with composite rare earth element nanoparticles and preparation method thereof |
| CN112143943A (en) * | 2020-10-29 | 2020-12-29 | 昆明理工大学 | Preparation method of heat-resistant aluminum alloy conductor |
| CN113046583A (en) * | 2021-03-05 | 2021-06-29 | 山西一禾铝业科技新材料有限公司 | High-strength electric-conductivity heat-resistant aluminum alloy rod, preparation method and heat-resistant aluminum alloy cable |
| CN114752745A (en) * | 2022-04-16 | 2022-07-15 | 昆明理工大学 | Preparation method of high-performance ternary aluminum-zirconium alloy conducting rod |
| CN114752745B (en) * | 2022-04-16 | 2023-12-19 | 昆明理工大学 | Preparation method of high-performance ternary aluminum-zirconium alloy conducting rod |
| CN115595474A (en) * | 2022-10-25 | 2023-01-13 | 无锡华能电缆有限公司（Cn） | Super heat-resistant aluminum alloy conductor, preparation method thereof and steel-cored super heat-resistant aluminum alloy stranded wire |
| CN115595474B (en) * | 2022-10-25 | 2023-08-25 | 无锡华能电缆有限公司 | Special heat-resistant aluminum alloy wire, preparation method thereof and steel core special heat-resistant aluminum alloy stranded wire |
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Application publication date: 20160127 |