CN103667801A - Super-high-conductivity aluminum alloy conductor for power transmission system and preparation method thereof - Google Patents
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Abstract
The invention relates to a super-high-conductivity aluminum alloy conductor for a power transmission system and a preparation method thereof. The aluminum alloy comprises the following components in percentage by weight: 0.14-0.3% of Si, 1.1-1.3% of Fe, 0.25-0.4% of Mn, 0.03-0.045% of Mg, 0.1-0.2% of Ga, 0.02-0.04% of Sn, 0.01-0.03% of mixed rare earth element RE and the balance of aluminum and inevitable impurity elements, wherein the mixed rare earth element comprises the following components: 20-30% of lanthanum, 20-30% of cerium, 10-20% of samarium, 10-20% of gadolinium, 5-10% of yttrium and 5-10% of neodymium. The aluminum alloy has super high conductivity and excellent tensile strength and tensile property.
Description
Technical field
The present invention relates to power industry transmission line wire technical field, particularly, relate to a kind of superelevation electric conductivity aluminium alloy conductor for power transmission system and preparation method thereof.
Background technology
The Aluminium Cable Steel Reinforced that overhead transmission line adopts is due to stable on heating restriction, and uses heat-resistant aluminum alloy wire more.In order not reduce intensity in During Process of Long-term Operation under normal operating temperature, do not increase conducting wire sag obvious, conventionally in electrician's fine aluminium, add trace alloying element to improve the thermotolerance of aluminium as the recrystallization temperature of the raising aluminium such as zirconium, titanium, although but zirconium, adding of titanium alloy element have guaranteed thermotolerance, cause the reduction of aluminium conductor electric conductivity.The electric conductivity of the heat-resistant aluminum alloy wire of early development is lower, further by the form that exists that adds rare earth element and boron to control impurity element, makes the electric conductivity of heat-resistant aluminum alloy wire be increased to 60%IACS.Chinese patent CN 102041418 A have announced the middle strength aluminium alloy line method of a kind of manufacture 57% electric conductivity, although tensile strength >=245MPa, but its electric conductivity is only 57%, if be widely used on the line, certainly will cause the huge loss of transmitting line electric energy, cause the voltage of circuit significantly to reduce simultaneously.
Based on above research and application background, China needs research and development superelevation conduction heat-resistant aluminum alloy wire badly to adapt to China's power industry development need, manufacture has the aluminium alloy monofilament of superelevation electric conductivity, for preparing the high-conductive heat-resistant aluminium alloy conductor basis of supplying raw materials, make heat-resistant aluminum alloy wire reach raising transmission capacity, reduce the object of transmission line loss, thereby meet the construction demand of large capacity transmission circuit and city extending capacity reformation.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of superelevation electric conductivity and preparation method thereof be provided, the superelevation electric conductivity of have >=62%IACS of this aluminium alloy and >=tensile strength and the tensile property of 260MPa, thereby meet the construction demand of large capacity transmission circuit.
For achieving the above object, technical scheme of the present invention is as follows:
A preparation method for superelevation electric conductivity aluminum alloy line, the composition of this aluminium alloy and weight percentage are Si:0.14-0.3%, Fe:1.1-1.3, Mn:0.25-0.4, Mg:0.03-0.045, Ga:0.1-0.2, Sn:0.02-0.04, mixed rare-earth elements RE:0.01-0.03, lanthanum in the component of described mixed rare-earth elements: 20-30%, cerium: 20-30%, samarium: 10-20, gadolinium: 10-20, yttrium: 5-10, neodymium: 5-10.
The preparation method of described aluminum alloy line, comprises the steps:
(1) raw material is prepared: select purity to be more than or equal to 99.9% aluminium ingot, silicon, iron, manganese, magnesium, gallium and tin are selected respectively aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the form of gallium and aluminium tin master alloy, and by lanthanum, cerium, samarium, gadolinium, yttrium is smelted into rare earth aluminium ingot mixing intermediate with the mishmetal that neodymium forms with fine aluminium ingot in crucible, and wherein mishmetal accounts for the 5-8% that mixes intermediate;
(2) aluminium ingot melting: aluminium ingot is put into and is heated to the vertical smelting furnace of 850-880 ℃ and is molten into after aluminium liquid, be transferred in the holding furnace that is heated to 760-780 ℃;
(3) Alloying Treatment: in aluminium liquid, first add described mixing intermediate, stir, after fully dissolving, add again aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, gallium and aluminium tin master alloy carry out alloying; (4) refining: be pressed into 2/3rds place's refined alloy liquid under alloy molten solution face with bell jar at twice with 0.65-0.8% hexachloroethane, stir afterwards, churning time is 20-30min, standing 30min;
(5) alloy component analysis, adjustment: with direct-reading fast spectral analysis instrument, principal element is carried out to stokehold detection, analyze, adjust strict control element content;
(6) continuous casting: the molten aluminium alloy liquid in holding furnace, through chute, filters by online degasification and ceramic filtering device, enters liquid filling machine continuous casting;
(7) thermal treatment: aluminum alloy ingot is put into baking oven and heat-treat, temperature is 300-400 ℃, and the time is 1-2 hour, takes out;
(8) drawing and stranded: will pull into the aluminum alloy line that diameter is 1.8-2.0mm on drawing machine through heat treated aluminum alloy ingot.
The composition of described aluminium alloy and weight percentage are Si:0.18%, Fe:1.2, Mn:0.3, Mg:0.03, Ga:0.1, Sn:0.03, mixed rare-earth elements RE:0.02, lanthanum in the component of described mixed rare-earth elements: 30%, cerium: 30%, samarium: 20%, gadolinium: 10%, yttrium: 5%, neodymium: 5%.
Described mixing intermediate adds when being heated to 780-790 ℃, described aluminium silicon master alloy, and ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the temperature that gallium and aluminium tin master alloy carry out alloying is 800-810 ℃.
In described step (8), drawing speed is 20m/s, and each relative reduction in area is 20%.
In the present invention, Si is controlled at 0.14-0.3%, adds silicon can generate Mg2Si phase, even if also can guarantee that under poor quenching conditions enough alloying elements enter in sosoloid, strengthens the intensity of aluminium alloy;
In the present invention, Fe is controlled at 1.1-1.3%, and iron level is higher than the electrical property that can affect alloy at 1.3 o'clock, little to the raising effect of the performances such as the resistance toheat of aluminium alloy, plasticity lower than 1.1 o'clock.
In the present invention, Mn is controlled at 0.25-0.4%, and manganese can improve the recrystallization temperature of aluminium alloy, refinement recrystal grain.
In the present invention, Mg is controlled at 0.03-0.05%, thermotolerance and electroconductibility that the Mg content within the scope of this can maximized raising aluminium alloy.
In the present invention, mixed rare-earth elements is controlled at 0.01-0.03%, can purify, crystal grain thinning, and improve electroconductibility, and mixed rare-earth elements does not need too much, can make on the contrary intensity and lumber recovery decline while surpassing 0.03%.
In the present invention, Ga is controlled at 0.1-0.2%, can obviously improve the resistance toheat of aluminum alloy line, and improves intensity on the basis that guarantees resistance toheat.
In the present invention, Sn is controlled at 0.02-0.04%, and tin can strengthen the hardness of aluminium alloy, but can produce corrosion when content surpasses certain content; The present invention consists of optimized alloy and accurately controls above-mentioned composition at specific content range, also by regulating addition sequence and the soaking time of alloying element, and apply thermal treatment process, guarantee have >=62%IACS of alloy superelevation electric conductivity and >=tensile strength and the tensile property of 260MPa, thereby meet the construction demand of large capacity transmission circuit.
Embodiment
Below the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein, only for description and interpretation the present invention, is not intended to limit the present invention.
Embodiment 1
Select purity to be more than or equal to 99.9% aluminium ingot, silicon, iron, manganese, magnesium, gallium and tin are selected respectively aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the form of gallium and aluminium tin master alloy, and by lanthanum, cerium, samarium, gadolinium, yttrium is smelted into rare earth aluminium ingot mixing intermediate with the mishmetal that neodymium forms with fine aluminium ingot in crucible, and wherein mishmetal accounts for and mixes 6% of intermediate; Aluminium ingot melting: aluminium ingot is put into and is heated to the vertical smelting furnace of 850-880 ℃ and is molten into after aluminium liquid, be transferred in the holding furnace that is heated to 780 ℃; Mix intermediate and add when being heated to 790 ℃, aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the temperature that gallium and aluminium tin master alloy carry out alloying is 805 ℃.With 0.8% hexachloroethane, be pressed into 2/3rds place's refined alloy liquid under alloy molten solution face at twice with bell jar, stir afterwards, churning time is 30min, standing 30min; With direct-reading fast spectral analysis instrument, principal element is carried out to stokehold detection, analyze, adjust strict control element content; Molten aluminium alloy liquid in holding furnace, through chute, filters by online degasification and ceramic filtering device, enters liquid filling machine continuous casting; Aluminum alloy ingot is put into baking oven and heat-treat, temperature is 360 ℃, and the time is 1.5 hours, takes out; To on drawing machine, pull into the aluminum alloy line that diameter is 1.8mm through heat treated aluminum alloy ingot.Drawing speed is 20m/s, and each relative reduction in area is 20%.Aluminium alloy consist of Si:0.18%, Fe:1.2, Mn:0.3, Mg:0.03, Ga:0.1, Sn:0.03, mixed rare-earth elements RE:0.02, lanthanum in the component of described mixed rare-earth elements: 30%, cerium: 30%, samarium: 20%, gadolinium: 10%, yttrium: 5%, neodymium: 5%.After testing, electric conductivity is 62.2%IACS, and tensile strength is 268MPa.
Embodiment 2
Select purity to be more than or equal to 99.9% aluminium ingot, silicon, iron, manganese, magnesium, gallium and tin are selected respectively aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the form of gallium and aluminium tin master alloy, and by lanthanum, cerium, samarium, gadolinium, yttrium is smelted into rare earth aluminium ingot mixing intermediate with the mishmetal that neodymium forms with fine aluminium ingot in crucible, and wherein mishmetal accounts for and mixes 8% of intermediate; Aluminium ingot melting: aluminium ingot is put into and is heated to the vertical smelting furnace of 860 ℃ and is molten into after aluminium liquid, be transferred in the holding furnace that is heated to 760 ℃; Mix intermediate and add when being heated to 785 ℃, aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the temperature that gallium and aluminium tin master alloy carry out alloying is 800 ℃.With 0.7% hexachloroethane, be pressed into 2/3rds place's refined alloy liquid under alloy molten solution face at twice with bell jar, stir afterwards, churning time is 25min, standing 30min; With direct-reading fast spectral analysis instrument, principal element is carried out to stokehold detection, analyze, adjust strict control element content; Molten aluminium alloy liquid in holding furnace, through chute, filters by online degasification and ceramic filtering device, enters liquid filling machine continuous casting; Aluminum alloy ingot is put into baking oven and heat-treat, temperature is 400 ℃, and the time is 1 hour, takes out; To on drawing machine, pull into the aluminum alloy line that diameter is 2.0mm through heat treated aluminum alloy ingot.Drawing speed is 18m/s, and each relative reduction in area is 20%.Aluminium alloy consist of Si:0.14%, Fe:1.15, Mn:0.25, Mg:0.045, Ga:0.1, Sn:0.04, lanthanum in the component of mixed rare-earth elements described in mixed rare-earth elements RE:0.03: 30%, cerium: 30%, samarium: 10%, gadolinium: 10%, yttrium: 10%, neodymium: 10%.After testing, electric conductivity is 62.1%IACS, and tensile strength is 265 MPa.
Embodiment 3
Select purity to be more than or equal to 99.9% aluminium ingot, silicon, iron, manganese, magnesium, gallium and tin are selected respectively aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the form of gallium and aluminium tin master alloy, and by lanthanum, cerium, samarium, gadolinium, yttrium is smelted into rare earth aluminium ingot mixing intermediate with the mishmetal that neodymium forms with fine aluminium ingot in crucible, and wherein mishmetal accounts for and mixes 8% of intermediate; Aluminium ingot melting: aluminium ingot is put into and is heated to the vertical smelting furnace of 870 ℃ and is molten into after aluminium liquid, be transferred in the holding furnace that is heated to 760 ℃; Mix intermediate and add when being heated to 790 ℃, aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the temperature that gallium and aluminium tin master alloy carry out alloying is 810 ℃.With 0.65% hexachloroethane, be pressed into 2/3rds place's refined alloy liquid under alloy molten solution face at twice with bell jar, stir afterwards, churning time is 25min, standing 30min; With direct-reading fast spectral analysis instrument, principal element is carried out to stokehold detection, analyze, adjust strict control element content; Molten aluminium alloy liquid in holding furnace, through chute, filters by online degasification and ceramic filtering device, enters liquid filling machine continuous casting; Aluminum alloy ingot is put into baking oven and heat-treat, temperature is 300 ℃, and the time is 2 hours, takes out; To on drawing machine, pull into the aluminum alloy line that diameter is 2.0mm through heat treated aluminum alloy ingot.Drawing speed is 20m/s, and each relative reduction in area is 20%.Aluminium alloy consist of Si:0.16%, Fe:1.3, Mn:0.4, Mg:0.035, Ga:0.2, Sn:0.02, mixed rare-earth elements RE:0.025, lanthanum in the component of described mixed rare-earth elements: 30%, cerium: 30%, samarium: 10%, gadolinium: 10%, yttrium: 10%, neodymium: 10%.After testing, electric conductivity is 62.05%IACS, and tensile strength is 266 MPa.
Alloy composition in embodiment 1-3 and performance test are as shown in table 1,2.
Table 1
| Alloying constituent (weight percent) | Si | Fe | Mn | Mg | Ga | Sn | Mixed rare-earth elements |
| Embodiment 1 | 0.18 | 1.2 | 0.3 | 0.03 | 0.1 | 0.03 | 0.02 |
| Embodiment 2 | 0.14 | 1.15 | 0.25 | 0.045 | 0.1 | 0.04 | 0.03 |
| Embodiment 3 | 0.16 | 1.3 | 0.4 | 0.035 | 0.2 | 0.02 | 0.025 |
Table 2
| Numbering | Electric conductivity IACS | Tensile strength MPa | Coiling performance test | Bending property test |
| Embodiment 1 | 62.2 | 268 | By | By |
| Embodiment 2 | 62.1 | 265 | By | By |
| Embodiment 3 | 62.05 | 266 | By | By |
Finally it should be noted that: the foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, although the present invention is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (4)
1. for a preparation method for the superelevation electric conductivity aluminum alloy line of power transmission system, it is characterized in that the composition of this aluminium alloy and weight percentage are Si:0.14-0.3%, Fe:1.1-1.3, Mn:0.25-0.4, Mg:0.03-0.045, Ga:0.1-0.2, Sn:0.02-0.04, mixed rare-earth elements RE:0.01-0.03, lanthanum in the component of described mixed rare-earth elements: 20-30%, cerium: 20-30%, samarium: 10-20, gadolinium: 10-20, yttrium: 5-10, neodymium: 5-10;
The preparation method of described aluminum alloy line, comprises the steps:
(1) raw material is prepared: select purity to be more than or equal to 99.9% aluminium ingot, silicon, iron, manganese, magnesium, gallium and tin are selected respectively aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the form of gallium and aluminium tin master alloy, and by lanthanum, cerium, samarium, gadolinium, yttrium is smelted into rare earth aluminium ingot mixing intermediate with the mishmetal that neodymium forms with fine aluminium ingot in crucible, and wherein mishmetal accounts for the 5-8% that mixes intermediate;
(2) aluminium ingot melting: aluminium ingot is put into and is heated to the vertical smelting furnace of 850-880 ℃ and is molten into after aluminium liquid, be transferred in the holding furnace that is heated to 760-780 ℃;
(3) Alloying Treatment: in aluminium liquid, first add described mixing intermediate, stir, after fully dissolving, add again aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, gallium and aluminium tin master alloy carry out alloying;
(4) refining: be pressed into 2/3rds place's refined alloy liquid under alloy molten solution face with bell jar at twice with 0.65-0.8% hexachloroethane, stir afterwards, churning time is 20-30min, standing 30min;
(5) alloy component analysis, adjustment: with direct-reading fast spectral analysis instrument, principal element is carried out to stokehold detection, analyze, adjust strict control element content;
(6) continuous casting: the molten aluminium alloy liquid in holding furnace, through chute, filters by online degasification and ceramic filtering device, enters liquid filling machine continuous casting;
(7) thermal treatment: aluminum alloy ingot is put into baking oven and heat-treat, temperature is 300-400 ℃, and the time is 1-2 hour, takes out;
(8) drawing and stranded: will pull into the aluminum alloy line that diameter is 1.8-2.0mm on drawing machine through heat treated aluminum alloy ingot.
2. the preparation method of a kind of superelevation electric conductivity aluminum alloy line as claimed in claim 1, the composition of described aluminium alloy and weight percentage are Si:0.18%, Fe:1.2, Mn:0.3, Mg:0.03, Ga:0.1, Sn:0.03, mixed rare-earth elements RE:0.02, lanthanum in the component of described mixed rare-earth elements: 30%, cerium: 30%, samarium: 20%, gadolinium: 10%, yttrium: 5%, neodymium: 5%.
3. the preparation method of a kind of superelevation electric conductivity aluminum alloy line as described in claim 1-2, described mixing intermediate adds when being heated to 780-790 ℃, described aluminium silicon master alloy, ferro-aluminum master alloy, aluminium manganese master alloy, magnalium master alloy, the temperature that gallium and aluminium tin master alloy carry out alloying is 800-810 ℃.
4. the preparation method of a kind of superelevation electric conductivity aluminum alloy line as described in claim 1-3, in described step (8), drawing speed is 18-20m/s, each relative reduction in area is 20%.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104264009A (en) * | 2014-09-30 | 2015-01-07 | 国网河南省电力公司周口供电公司 | High-Fe Al alloy conductor material and annealing process thereof |
| CN108098088A (en) * | 2018-01-12 | 2018-06-01 | 昆山品志金属材料有限公司 | One kind is careful wire cutting device and cut-sytle pollination method |
| CN108893660A (en) * | 2018-07-11 | 2018-11-27 | 合肥华盖光伏科技有限公司 | A kind of high-conductivity aluminum alloy conducting wire and preparation method thereof |
| CN111128445A (en) * | 2019-12-06 | 2020-05-08 | 远东电缆有限公司 | Aluminum-manganese alloy steel-clad reinforced overhead conductor and preparation process thereof |
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| CN101060039A (en) * | 2006-10-09 | 2007-10-24 | 北京科技大学 | A leadless alloy designed electrolytic capacitor aluminum foil |
| CN101587757A (en) * | 2009-06-19 | 2009-11-25 | 金杯电工股份有限公司 | Aluminum alloy lead with lanthanon yttric and preparation method thereof |
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| CN101060039A (en) * | 2006-10-09 | 2007-10-24 | 北京科技大学 | A leadless alloy designed electrolytic capacitor aluminum foil |
| CN101587757A (en) * | 2009-06-19 | 2009-11-25 | 金杯电工股份有限公司 | Aluminum alloy lead with lanthanon yttric and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104264009A (en) * | 2014-09-30 | 2015-01-07 | 国网河南省电力公司周口供电公司 | High-Fe Al alloy conductor material and annealing process thereof |
| CN108098088A (en) * | 2018-01-12 | 2018-06-01 | 昆山品志金属材料有限公司 | One kind is careful wire cutting device and cut-sytle pollination method |
| CN108098088B (en) * | 2018-01-12 | 2023-12-29 | 昆山品志金属材料有限公司 | Slow wire cutting device and cutting control method |
| CN108893660A (en) * | 2018-07-11 | 2018-11-27 | 合肥华盖光伏科技有限公司 | A kind of high-conductivity aluminum alloy conducting wire and preparation method thereof |
| CN111128445A (en) * | 2019-12-06 | 2020-05-08 | 远东电缆有限公司 | Aluminum-manganese alloy steel-clad reinforced overhead conductor and preparation process thereof |
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