CN103225029A

CN103225029A - GIS aluminum alloy conductor for smart grid and treatment process thereof

Info

Publication number: CN103225029A
Application number: CN 201310121353
Authority: CN
Inventors: 王飞; 席建东; 曾鸣
Original assignee: JIANGSU HUAJIANG TECHNOLOGY Co Ltd
Current assignee: JIANGSU HUAJIANG TECHNOLOGY Co Ltd
Priority date: 2013-04-10
Filing date: 2013-04-10
Publication date: 2013-07-31

Abstract

The present invention relates to a GIS aluminum alloy conductor for smart grid, and the GIS aluminum alloy conductor comprises, based on the weight percentage, 6.5 -7.5% of silicon, 0.25-0.35% of manganese, 0.08 - 0.15%of titanium, 0-0.7% of impurities and the balance of Al; The process comprises the steps of heating at a temperature of 530 +/- 5 DEG C for 3 - 5 hours in solution treatment process with water as the cooling medium and water temperature of between 80 and 100 DEG C; heating at a temperature of 250 +/- 5 DEG C for 3 - 5 hours in aging process, and then cooled by air cooling. The invention provides an A356 aluminum alloy conductor with high conductivity and controlled tensile strength and elongation rate, which has not only standard conductivity but also high increased electric conductivity, and has a mechanical property that meets technical requirements.

Description

Used for intelligent electric network GIS aluminium alloy conductor and treatment process thereof

Affiliated technical field

The present invention relates to a kind of aluminium alloy conductor, especially be applied to the cast aluminium alloy conductor of fully-enclosed combined electric high-tension switch gear.

Background technology

At present, " with aluminium joint copper " is international general trend, and the application prospect of domestic aluminium and aluminium alloy is boundless, especially along with the development of domestic intelligent grid, and the broadened application in ultra-high voltage and extra-high voltage power transmission and distribution.China's bauxite resource is abundanter, reserves in the earth's crust are about 8%, the content of copper in the earth's crust only is 0.01%, and the price of copper is 3 times of aluminium approximately, therefore " copper changes aluminium " is trend of the times, but because the specific conductivity of aluminium only is 2/3 of a copper, the specific conductivity of its alloy is lower, makes to apply to be restricted.

The electroconductibility of aluminium (specific conductivity is 37MS/m) is only second to silver (specific conductivity is 60MS/m), copper (specific conductivity is 57MS/m) and gold (specific conductivity is 42MS/m), though the specific conductivity of aluminium has only 2/3 of copper, but density has only 1/3 of copper, so carry the electricity with amount, the quality of aluminium has only half of copper.The oxide film on aluminium surface not only has corrosion resistant ability, and certain insulativity is arranged, so aluminium has been widely used in high-voltage switch electric appliance, electrical equipment process industry, electric wire industry and radio industry.

As everyone knows, the specific conductivity of pure metal is best, the specific conductivity of fine aluminium is 37MS/m, but fine aluminium can not heat treatment reinforcement, so tensile strength is lower, in order to guarantee its tensile strength, often adds the aluminium alloy that multiple alloying element forms the various trades mark, can improve tensile strength though add alloying element, reduce electroconductibility simultaneously.

In aluminium alloy, cast aluminium alloy Al-Si-Mg cording has good castability, it has good mechanical property, corrosion resistance and physicals, and have light weight, characteristic that specific tenacity is high, be widely used in every profession and trade, wherein (army's mark of the U.S. AlSi7Mg0.3) is current application one of alloy the most widely to the A356 aluminium alloy.

In high-voltage switch electric appliance, interior dress conductor class part generally adopts the A356 alloy, it not only will satisfy the mechanical property requirements of A356 alloy, also have the requirement of specific conductivity greater than 26 MS/m, the specific conductivity of at present domestic casting A356-T6 aluminium alloy conductor has only 21～23MS/m, though some electroconductibility reaches requirement, is based upon on the basis of sacrificing mechanical property requirements, can not satisfy service requirements equally, in the high-voltage switch gear conductor, apply thereby influence the A356 alloy.

Summary of the invention

In order to overcome the deficiency of traditional A356 aluminium alloy conductor " specific conductivity is low ", the invention provides a kind of A356 aluminium alloy conductor with high conductivity and controlled tensile strength and unit elongation, not only electroconductibility is up to standard and specific conductivity increases substantially for this conductor, and mechanical property satisfies the use technology requirement.

The technical solution adopted for the present invention to solve the technical problems is:

The present invention is counted by weight percentage: comprise following component: Si6.5%-7.5%, Mg0.25%-0.35%, Ti0.08%-0.15%, and contain no more than 0.7% impurity, surplus is Al.

Described impurity comprises following component, counts by weight percentage: Fe≤0.2%, Cu≤0.1%, Zn≤0.1%, Mn≤0.1%, Zr≤0.2%, Sn≤0.01%, Pb≤0.03%.

Height switch aluminium alloy conductor thermal treatment process, wherein in the solution treatment: Heating temperature is that 530 ± 5 ℃, soaking time are that 3～5h, heat-eliminating medium are that water, its water temperature are 80-100 ℃; In the ageing treatment: Heating temperature is that 250 ± 5 ℃, soaking time are that 3～5h, the type of cooling are air cooling.

The invention has the beneficial effects as follows that meet in alloy principal element, foreign matter content and mechanical property under the prerequisite of A356 standard-required, specific conductivity reaches 28～30MS/m, conductivity has improved 20%, and specific conductivity meets and exceeds the requirement of minimum 26 MS/m.

Embodiment

In table 1, on the basis of A356 standard-required, the principal element too high levels reduces specific conductivity except that aluminium (Al) in order to avoid, need the keep under strict control content of principal element, principal element contains the lower limit of measuring A356 standard-required scope, and promptly content is Si:6.5%～7.0%, Mg:0.25%～0.35%, Ti:0.08%～0.15.

In table 2, on the basis of A356 standard-required, require impurity content as strict as possible, the content of impurity element is low more good more, prevents the too high levels of impurity element and reduces specific conductivity.

In table 3, the T6 thermal treatment process is adjusted into T8 thermal treatment process (claiming in the GB that solution treatment adds stabilization treatment), and on the basis of T8 thermal treatment process, has carried out repeatedly heat treatment process test, the T8 thermal treatment process after final definite the improvement.

Table 1 A356 alloy principal element content requirement

Principal element	Si	Mg	Ti	Al
					A356 standard (%)	6.5～7.5	0.25～0.45	0.08～0.2	Surplus
Improve A356 (%)	6.5～7.0	0.25～0.35	0.08～0.15	Surplus

Table 2 A356 alloy impurity limit the quantity of (%)

The element of limiting the quantity of	Fe	Cu	Zn	Mn	Zr	Sn	Pb	The impurity summation
									The A356 standard (≤%)	0.2	0.1	0.1	0.1	0.2	0.01	0.03	0.7

Table 3 A356 alloy heat treatment process

Embodiment one:

The present invention is counted by weight percentage: comprise following component: Si6.5%, Mg0.35%, Ti0.15%, and contain no more than 0.7% impurity, surplus is Al.

Height switch aluminium alloy conductor thermal treatment process, wherein in the solution treatment: Heating temperature is that 535 ℃, soaking time are that 5h, heat-eliminating medium are that water, its water temperature are 100 ℃; In the ageing treatment: Heating temperature is that 255 ℃, soaking time are that 5h, the type of cooling are air cooling.

Embodiment two:

The present invention is counted by weight percentage: comprise following component: Si7.5%, Mg0.25%%, Ti0.08%%, and contain no more than 0.7% impurity, surplus is Al.

Height switch aluminium alloy conductor thermal treatment process, wherein in the solution treatment: Heating temperature is that 525 ℃, soaking time are that 3h, heat-eliminating medium are that water, its water temperature are 80 ℃; In the ageing treatment: Heating temperature is that 245 ℃, soaking time are that 3h, the type of cooling are air cooling.

Embodiment three:

The present invention is counted by weight percentage: comprise following component: Si7%, Mg0.3%, Ti0.1%, and contain no more than 0.7% impurity, surplus is Al.

Height switch aluminium alloy conductor thermal treatment process, wherein in the solution treatment: Heating temperature is that 530 ℃, soaking time are that 4h, heat-eliminating medium are that water, its water temperature are 90 ℃; In the ageing treatment: Heating temperature is that 250 ℃, soaking time are that 4h, the type of cooling are air cooling.

Claims

1. used for intelligent electric network GIS aluminium alloy conductor is characterized in that, counts by weight percentage: comprise following component: Si6.5%-7.5%, Mg0.25%-0.35%, Ti0.08%-0.15%, and contain no more than 0.7% impurity, surplus is Al.

2. used for intelligent electric network GIS aluminium alloy conductor according to claim 1, it is characterized in that, described impurity comprises following component, counts by weight percentage: Fe≤0.2%, Cu≤0.1%, Zn≤0.1%, Mn≤0.1%, Zr≤0.2%, Sn≤0.01%, Pb≤0.03%.

3. used for intelligent electric network GIS aluminium alloy conductor thermal treatment process is characterized in that, wherein in the solution treatment: Heating temperature is that 530 ± 5 ℃, soaking time are that 3～5h, heat-eliminating medium are that water, its water temperature are 80-100 ℃; In the ageing treatment: Heating temperature is that 250 ± 5 ℃, soaking time are that 3～5h, the type of cooling are air cooling.