CN114703408A - High-conductivity high-strength rare earth aluminum alloy composite material for splicing fitting and preparation method thereof - Google Patents
High-conductivity high-strength rare earth aluminum alloy composite material for splicing fitting and preparation method thereof Download PDFInfo
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C21/00—Alloys based on aluminium
- C22C21/02—Alloys based on aluminium with silicon as the next major constituent
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/026—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
- C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
- C22C21/08—Alloys based on aluminium with magnesium as the next major constituent with silicon
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/043—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with silicon as the next major constituent
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
- C22F1/047—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon of alloys with magnesium as the next major constituent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/023—Alloys based on aluminium
Abstract
The invention discloses a high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings and a preparation method thereof, wherein the rare earth aluminum alloy material mainly comprises the following raw materials in percentage by weight: 85-90% of Al, 0.3-0.8% of Si, 0.63-0.71% of Mg, 0.15-0.25% of Fe, 0.05-0.1% of rare earth metal, 0.01-0.025% of B and the balance of impurities; the tensile strength of the rare earth aluminum alloy material is 342.2-352.328MPa, and the electric conductivity is 49.36-55.97% IACS. The aluminum alloy material is treated by adding rare earth metal, boronizing, solid solution, aging, cold rolling and other modes, so that the conductivity and mechanical property of the aluminum alloy material are obviously improved, and the preparation method is simple in process, convenient to operate, high in practicability and suitable for industrial production.
Description
Technical Field
The invention belongs to the technical field of electrical materials, and particularly relates to a high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings and a preparation method thereof.
Background
With the improvement of voltage grade and the application of various novel leads, the splicing fitting has insufficient crimping grip and the crimping area is loosened after long-term operation to cause the increase of splicing resistance, so that accidents caused by the reduction of the strength and the conductivity of the splicing fitting are frequently seen in China. At present, a splicing fitting drainage component is usually made of an electrical pure aluminum section, a pressure connection area is difficult to avoid to be loosened too early in the operation of a large-specification line, so that temperature rise is caused, and the conductivity and the mechanical property of the drainage component are obviously reduced along with the increase of the temperature rise amplitude and creep relaxation due to poor heat-resistant stability. The process is vicious and circulated until abnormal temperature rise, and finally the product is invalid and falls off, so that accidents are caused. For high-voltage grade lines, especially extra-high voltage lines, extra-high voltage lines and the like, large-area power failure can be caused, the consequences are serious, and urgent solution is needed. The research on the high-performance hardware fitting material is used for replacing pure aluminum materials in the splicing hardware fitting, so that the material for the drainage component of the splicing hardware fitting has high strength and high conductivity, the conductivity and the anti-relaxation performance of the splicing hardware fitting are improved, the method is an effective way and a key method for ensuring the long-term stability of the crimping grip of the lead and improving the operation safety and reliability of the line, and has important application value for improving the safety stability of the power transmission and transformation line and reducing the operation and maintenance cost.
Although pure aluminum materials have excellent properties such as good plasticity and conductivity, the strength and the like of the pure aluminum materials are low, and therefore, the pure aluminum materials cannot meet the actual use requirements in many cases. Generally, the splicing fitting is made of industrial pure aluminum material, and the industrial pure aluminum contains a small amount of impurity elements, such as Si, Fe, Ti, V, Cr, Zr and the like. Wherein, Si and Fe are high in content and are basic impurity elements, and Ti, V, Cr and Zr are transition group impurity elements, and the content is generally low. These impurity elements are dissolved in the aluminum matrix in a solid state to significantly reduce the conductivity of aluminum, and therefore, it is necessary to perform a certain treatment on commercially pure aluminum to improve the conductivity and strength, so that it is suitable for the splicing fitting. Therefore, the research and development of a high-conductivity high-strength rare earth aluminum alloy composite material suitable for splicing fittings is a problem which needs to be solved urgently at present.
Disclosure of Invention
The invention aims to solve the technical problems in the prior art, and the invention aims to provide a high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings mainly comprises the following raw materials in percentage by weight: 85-90% of Al, 0.3-0.8% of Si, 0.63-0.71% of Mg, 0.15-0.25% of Fe, 0.05-0.1% of rare earth metal, 0.01-0.025% of B and the balance of impurities; the tensile strength of the rare earth aluminum alloy material is 342.2-352.328MPa, and the electric conductivity is 49.36-55.97% IACS.
Further, the rare earth aluminum alloy material mainly comprises the following raw materials in percentage by weight: 89% of Al, 0.5% of Si, 0.67% of Mg, 0.2% of Fe, 0.08% of rare earth metal, 0.02% of B and the balance of impurities; the tensile strength of the rare earth aluminum alloy material is 352.328MPa, and the electric conductivity is 55.97% IACS.
Further, the rare earth metal is any one of Y, La, Ce and Tb.
Furthermore, the impurities in the rare earth aluminum alloy material are any one or more of Ti, V, Cr, Mn and Zr.
Further, the preparation method of the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting comprises the following steps:
(1) putting the aluminum block into a high-temperature melting furnace, and after the aluminum block is melted, carrying out heat preservation at a certain temperature to obtain an aluminum melt for later use;
(2) heating the aluminum melt obtained in the step (1), adding rare earth metal, and keeping the temperature of the aluminum melt;
(3) blowing a boronizing agent potassium fluoborate into the aluminum melt obtained in the step (2) through nitrogen at a certain temperature, and standing;
(4) blowing a 4AB type refining agent into the aluminum melt obtained in the step (3) through nitrogen, wherein the adding mass of the refining agent is 1.5-1.8% of the mass of the aluminum melt in the step (3);
(5) standing the aluminum melt obtained in the step (4) for 12-15min, slagging off, discharging, and casting a cast ingot bar;
(6) performing head cutting, tail cutting and surface oxidation treatment on the ingot casting rod obtained in the step (5), and then performing extrusion deformation to obtain an extrusion piece;
(7) and (4) carrying out solid solution aging treatment on the extrusion piece obtained in the step (6) at a certain temperature, and then carrying out cold rolling treatment on the extrusion piece subjected to the solid solution aging treatment to obtain the high-conductivity high-strength rare earth aluminum alloy material.
Further, the heat preservation temperature in the step (1) is 715-730 ℃, and the heat preservation time is 32-45 min.
Further, the temperature of the aluminum melt in the step (2) is increased to 740 and 760 ℃, and the heat preservation time is 15-35 min.
Further, the temperature of blowing the boronizing agent potassium fluoborate in the step (3) is 750-760 ℃, and the standing time is 55-60 min.
Further, the solid solution temperature in the step (7) is 500-550 ℃, and the solid solution heat preservation time is 2-5 h; the temperature of the aging treatment is 180 ℃ and 400 ℃, and the time of the aging treatment is 15-75 h.
Further, the splicing fitting is prepared from the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting.
Compared with the prior art, the invention has the beneficial effects that:
(1) the rare earth metal is added into the aluminum alloy material, firstly, the rare earth metal can generate binary or multi-component compounds with high melting point and light density with low melting point elements such as Ti, V, Cr, Mn, Zr and the like in the aluminum alloy, when the metal smelting temperature is lower than the melting point of the compounds, the compounds float up to form slag and are separated out so as to purify aluminum liquid, micro particles of the compounds become heterogeneous crystal nuclei in the aluminum crystallization process so as to refine crystal grains, the addition of the rare earth can improve the surface tension, the fluidity, the viscosity and other physical and chemical properties of aluminum alloy melt and the slag, be beneficial to nodulizing of non-metal inclusions and promote the floating of the non-metal inclusions, and further effectively remove the non-metal inclusions; secondly, under the general condition, the atomic radius of the rare earth is larger than that of aluminum, the property is more active, the surface defect of an alloy phase is easily filled when the rare earth is melted in aluminum liquid, so that the surface tension on the interface of a new phase and an old phase is reduced, the formation of crystal grain nucleation and growth inhibition can be promoted, in addition, the modification effect of the rare earth can also be embodied as changing the form of a hard and brittle intermetallic compound phase, inhibiting the formation of needle-shaped and thick massive compounds and reducing the size of a precipitated phase in the aging process; finally, the rare earth elements can play a role in microalloying, can be selectively adsorbed on a crystal grain interface, have a function of refining crystal grains, and can effectively improve the strength of the aluminum alloy.
(2) The preparation method of the invention improves the conductivity and tensile strength of the aluminum alloy material by boronizing treatment, solid solution, aging treatment and cold rolling treatment, and the preparation method of the invention is simple and convenient to operate, avoids the defects of small size, high mold cost and low material density of powder metallurgy technology, and is suitable for industrial mass production.
Drawings
FIG. 1 is a graph showing the effect of the amount of rare earth added on the tensile strength (UTS), Yield Strength (YS) and Elongation (EI) of an aluminum alloy material in accordance with the present invention;
FIG. 2 is a graph showing the effect of the amount of rare earth added on the electrical conductivity of the aluminum alloy in the present invention.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
Example 1
A high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings mainly comprises the following raw materials in percentage by weight: 89% of Al, 0.5% of Si, 0.67% of Mg, 0.2% of Fe, 0.08% of La and 0.02% of B, and the balance of impurities of Ti, V, Cr and Mn; the tensile strength of the rare earth aluminum alloy material is 352.328MPa, and the electric conductivity is 55.97% IACS.
The preparation method of the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting comprises the following steps:
(1) putting the aluminum block into a high-temperature melting furnace, and after the aluminum block is melted, keeping the temperature at 720 ℃ for 36min to obtain an aluminum melt for later use;
(2) heating the aluminum melt obtained in the step (1) to 750 ℃, adding rare earth metal La, and keeping the temperature of the aluminum melt for 25 min;
(3) blowing a boronizing agent potassium fluoborate into the aluminum melt obtained in the step (2) through nitrogen at 750 ℃, and standing for 60 min;
(4) blowing a 4AB type refining agent into the aluminum melt obtained in the step (3) through nitrogen, wherein the adding mass of the refining agent is 1.5-1.8% of the mass of the aluminum melt in the step (3);
(5) standing the aluminum melt obtained in the step (4) for 12-15min, slagging off, discharging, and casting an ingot bar;
(6) performing head cutting, tail cutting and surface oxidation treatment on the ingot casting rod obtained in the step (5), and then performing extrusion deformation to obtain an extrusion piece;
(7) and (3) carrying out solution treatment on the extruded piece obtained in the step (6) at 520 ℃, preserving heat for 3.5h, then carrying out aging treatment at 300 ℃, preserving heat for 50h, and finally carrying out cold rolling treatment on the extruded piece subjected to solution aging treatment to obtain the high-conductivity high-strength rare earth aluminum alloy material.
Example 2
A high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings mainly comprises the following raw materials in percentage by weight: 85% of Al, 0.3% of Si, 0.63% of Mg, 0.15% of Fe, 0.05% of Tb and 0.01% of B, and the balance of impurities of Ti, V, Cr, Mn and Zr; the tensile strength of the rare earth aluminum alloy material is 342.2MPa, and the electric conductivity is 49.36% IACS.
The preparation method of the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting comprises the following steps:
(1) putting the aluminum block into a high-temperature melting furnace, and after the aluminum block is melted, preserving the heat for 45min at 715 ℃ to obtain an aluminum melt for later use;
(2) heating the aluminum melt obtained in the step (1) to 740 ℃, adding rare earth metal Tb, and preserving the heat of the aluminum melt for 35 min;
(3) blowing a boronizing agent potassium fluoborate into the aluminum melt obtained in the step (2) through nitrogen at 755 ℃, and standing for 57 min;
(4) blowing a 4AB type refining agent into the aluminum melt obtained in the step (3) through nitrogen, wherein the adding mass of the refining agent is 1.5-1.8% of the mass of the aluminum melt in the step (3);
(5) standing the aluminum melt obtained in the step (4) for 12-15min, slagging off, discharging, and casting a cast ingot bar;
(6) performing head cutting, tail cutting and surface oxidation treatment on the ingot casting rod obtained in the step (5), and then performing extrusion deformation to obtain an extrusion piece;
(7) and (3) carrying out solution treatment on the extrusion piece obtained in the step (6) at 500 ℃, preserving heat for 5h, then carrying out aging treatment at 180 ℃, preserving heat for 72h, and finally carrying out cold rolling treatment on the extrusion piece subjected to solution aging treatment to obtain the high-conductivity high-strength rare earth aluminum alloy material.
Example 3
A high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings mainly comprises the following raw materials in percentage by weight: 90% of Al, 0.8% of Si, 0.71% of Mg, 0.25% of Fe, 0.1% of Y and 0.025% of B, and the balance of impurities of Ti, V, Cr and Zr; the tensile strength of the rare earth aluminum alloy material is 346.549MPa, and the electric conductivity is 51.23% IACS.
The preparation method of the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting comprises the following steps:
(1) putting the aluminum block into a high-temperature melting furnace, and after the aluminum block is melted, preserving the heat for 32min at 730 ℃ to obtain an aluminum melt for later use;
(2) heating the aluminum melt obtained in the step (1) to 760 ℃, adding rare earth metal La, and keeping the temperature of the aluminum melt for 15 min;
(3) blowing a boronizing agent potassium fluoborate into the aluminum melt obtained in the step (2) through nitrogen at 760 ℃, and standing for 58 min;
(4) blowing a 4AB type refining agent into the aluminum melt obtained in the step (3) through nitrogen, wherein the adding mass of the refining agent is 1.5-1.8% of the mass of the aluminum melt in the step (3);
(5) standing the aluminum melt obtained in the step (4) for 12-15min, slagging off, discharging, and casting a cast ingot bar;
(6) performing head cutting, tail cutting and surface oxidation treatment on the ingot casting rod obtained in the step (5), and then performing extrusion deformation to obtain an extrusion piece;
(7) and (3) carrying out solution treatment on the extrusion piece obtained in the step (6) at 550 ℃, preserving heat for 2h, then carrying out aging treatment at 400 ℃, preserving heat for 15h, and finally carrying out cold rolling treatment on the extrusion piece subjected to solution aging treatment to obtain the high-conductivity high-strength rare earth aluminum alloy material.
Comparative example 1
An aluminum alloy composite material for splicing fittings and a preparation method thereof are the same as those in the embodiment 1 except that rare earth metal is not added.
Comparative example 2
A rare earth aluminum alloy composite material for splicing fittings and a preparation method thereof are the same as those in the embodiment 1 except that the step (3) is omitted in the preparation method.
Comparative example 3
A rare earth aluminum alloy composite material for splicing fittings and a preparation method thereof are the same as those in the embodiment 1 except that the step (7) is omitted in the preparation method.
The mechanical properties and conductivity of the aluminum alloy composite materials prepared in examples 1 to 3 and comparative example 1 were measured, and as shown in fig. 1 and 2, example 1 corresponds to a rare earth metal addition amount of 0.08%, and comparative example 1 corresponds to a rare earth metal addition amount of 0. As can be seen from fig. 1 and 2, with the addition of the rare earth metal, the influence on the tensile strength and the yield strength of the aluminum alloy material is small, but the influence on the elongation of the aluminum alloy composite material is large, the elongation of the aluminum alloy composite material reaches the maximum when the addition amount of the rare earth metal is 0.08% of that in example 1, with the further increase of the addition amount of the rare earth metal, the growth rate of the aluminum alloy material rather tends to decrease, and the electrical conductivity increases with the increase of the addition amount of the rare earth metal. From this, it is shown that the addition of rare earth metal can improve the electrical conductivity and mechanical properties of the aluminum alloy material to some extent, and that the addition amount of rare earth metal of 0.08% is most suitable in example 1.
The aluminum alloy composite materials prepared in examples 1 to 3 and comparative example 2 were subjected to conductivity test, and the specific results are shown in table 1.
TABLE 1 comparison data of influence of boronization treatment on conductivity of aluminum alloy composite material
| Group of samples | Electrical conductivity (% IACS) |
| Example 1 | 55.97 |
| Example 2 | 49.36 |
| Example 3 | 51.23 |
| Comparative example 2 | 41.56 |
As can be seen from Table 1, the conductivity of the aluminum alloy material after boronization is improved to a certain extent because the small amount of transition element impurities such as Ti, V, Mn, Cr, etc. dissolved in the aluminum matrix can easily absorb the free electrons in the aluminum to fill the electron shells which are not filled with the impurities, so that the number of conduction electrons is reduced, the conductivity of the material is reduced, and boron in the boronizing agent reacts with the transition element impurities to form insoluble boride (such as VB)2、TiB2Etc.) to be deposited on the furnace bottom and removed in the form of slag, thereby improving the conductivity of the aluminum alloy material.
The aluminum alloy composite materials prepared in examples 1 to 3 and comparative example 3 were subjected to conductivity tests, and the specific results are shown in table 2.
TABLE 2 comparative data on the effects of solid solution, aging and cold rolling on the electrical conductivity and tensile strength of aluminum alloy composites
| Group of samples | Electrical conductivity (% IACS) | Tensile strength (MPa) |
| Example 1 | 55.97 | 352.328 |
| Example 2 | 49.36 | 342.2 |
| Example 3 | 51.23 | 346.549 |
| Comparative example 3 | 42.37 | 321.823 |
As can be seen from table 2, the rare earth aluminum alloy composites in examples 1 to 3 are all subjected to solution treatment, aging treatment and cold rolling treatment, and the electrical conductivity and tensile strength are higher than those of comparative example 3, because the aluminum alloy is subjected to solution treatment, aging treatment and cold rolling treatment, the crystal grain size of the matrix of the aluminum alloy can be obviously refined, the morphology of the second phase can be changed, the electrical conductivity of the aluminum alloy can be improved under the condition of not losing the tensile strength of the aluminum alloy, and the tensile strength and the electrical conductivity of the aluminum alloy can be increased.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting is characterized by mainly comprising the following raw materials in percentage by weight: 85-90% of Al, 0.3-0.8% of Si, 0.63-0.71% of Mg, 0.15-0.25% of Fe, 0.05-0.1% of rare earth metal, 0.01-0.025% of B and the balance of impurities; the tensile strength of the rare earth aluminum alloy material is 342.2-352.328MPa, and the electric conductivity is 49.36-55.97% IACS.
2. The high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting of claim 1, wherein the rare earth aluminum alloy material mainly comprises the following raw materials in percentage by weight: 89% of Al, 0.5% of Si, 0.67% of Mg, 0.2% of Fe, 0.08% of rare earth metal, 0.02% of B and the balance of impurities; the tensile strength of the rare earth aluminum alloy material is 352.328MPa, and the electric conductivity is 55.97% IACS.
3. The highly conductive and high strength rare earth aluminum alloy composite material for splicing fittings according to claim 1 or 2, wherein the rare earth metal is any one of Y, La, Ce and Tb.
4. The highly conductive and high strength rare earth aluminum alloy composite material for splicing fittings according to claim 1 or 2, wherein the impurities in the rare earth aluminum alloy material are any one or more of Ti, V, Cr, Mn and Zr.
5. A method for preparing the high-conductivity high-strength rare earth aluminum alloy composite material for splicing fittings according to any one of claims 1 to 4, which is characterized by comprising the following steps:
(1) putting the aluminum block into a high-temperature melting furnace, and after the aluminum block is melted, carrying out heat preservation at a certain temperature to obtain an aluminum melt for later use;
(2) heating the aluminum melt obtained in the step (1), adding rare earth metal, and keeping the temperature of the aluminum melt;
(3) blowing a boronizing agent potassium fluoborate into the aluminum melt obtained in the step (2) through nitrogen at a certain temperature, and standing;
(4) blowing a 4AB type refining agent into the aluminum melt obtained in the step (3) through nitrogen, wherein the adding mass of the refining agent is 1.5-1.8% of the mass of the aluminum melt in the step (3);
(5) standing the aluminum melt obtained in the step (4) for 12-15min, slagging off, discharging, and casting a cast ingot bar;
(6) performing head cutting, tail cutting and surface oxidation treatment on the ingot casting rod obtained in the step (5), and then performing extrusion deformation to obtain an extrusion piece;
(7) and (4) carrying out solid solution aging treatment on the extrusion piece obtained in the step (6) at a certain temperature, and then carrying out cold rolling treatment on the extrusion piece subjected to the solid solution aging treatment to obtain the high-conductivity high-strength rare earth aluminum alloy material.
6. The method for preparing the highly conductive and high strength rare earth aluminum alloy composite material for the splicing fitting as claimed in claim 5, wherein the insulation temperature in the step (1) is 715-730 ℃ and the insulation time is 32-45 min.
7. The method for preparing the highly conductive and high strength rare earth aluminum alloy composite material for the splicing fitting as claimed in claim 5, wherein the temperature of the aluminum melt in the step (2) is 740 and 760 ℃, and the time of the heat preservation is 15-35 min.
8. The method for preparing the highly conductive and high strength rare earth aluminum alloy composite material for the splicing fitting as claimed in claim 5, wherein the temperature for blowing the boronizing agent potassium fluoborate in the step (3) is 750-760 ℃, and the standing time is 55-60 min.
9. The method for preparing the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting as claimed in claim 5, wherein the solid solution temperature in the step (7) is 500-550 ℃, and the solid solution heat preservation time is 2-5 h; the temperature of the aging treatment is 180 ℃ and 400 ℃, and the time of the aging treatment is 15-75 h.
10. A splicing fitting prepared from the high-conductivity high-strength rare earth aluminum alloy composite material for the splicing fitting as claimed in any one of claims 1 to 4.
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| CN115612899A (en) * | 2022-09-28 | 2023-01-17 | 国网河南省电力公司电力科学研究院 | High-conductivity anti-fatigue aluminum alloy conductor material and preparation method thereof |
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| CN115612899A (en) * | 2022-09-28 | 2023-01-17 | 国网河南省电力公司电力科学研究院 | High-conductivity anti-fatigue aluminum alloy conductor material and preparation method thereof |
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