CN108203784B - Magnesium alloy mesh with electromagnetic shielding function and preparation method thereof - Google Patents
Magnesium alloy mesh with electromagnetic shielding function and preparation method thereof Download PDFInfo
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- CN108203784B CN108203784B CN201611176487.4A CN201611176487A CN108203784B CN 108203784 B CN108203784 B CN 108203784B CN 201611176487 A CN201611176487 A CN 201611176487A CN 108203784 B CN108203784 B CN 108203784B
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/04—Alloys based on magnesium with zinc or cadmium 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
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal 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
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Abstract
The invention relates to a magnesium alloy mesh with an electromagnetic shielding function and a preparation method thereof, belonging to the field of industrial magnesium alloy. The magnesium alloy comprises the following components in percentage by mass: 0.5-3.5%, Y: 0.2-1.5%, Cu: 0.2-1.0%, Co: 0.2-0.8%, wherein the total content of Cu and Co is not more than 1.5%, and the balance is Mg. The magnesium alloy mesh with the electromagnetic shielding function is made of the magnesium alloy. The preparation method of the magnesium alloy mesh comprises the steps of alloy smelting, homogenization, alloy plastic deformation, mesh weaving and the like. The alloy has better electromagnetic shielding performance, can further reduce the weight of the whole structural member on the basis of the existing sealing material, has the shielding effectiveness actually measured by a typical member reaching more than 60dB, and can be applied to the military industry.
Description
Technical Field
The invention relates to a magnesium alloy mesh with an electromagnetic shielding function and a preparation method thereof, wherein main alloy elements added in a deformed magnesium alloy comprise Zn, Y, Cu, Co and the like, and the main deformation method comprises one or a combination of more of forging, extrusion and rolling, and belongs to the field of industrial magnesium alloy.
Background
Electromagnetic waves, also known as electromagnetic radiation, are energy waves in which the electric and magnetic fields are periodically changed perpendicular to each other. Electromagnetic waves can effectively transfer energy, and all objects above absolute zero can release electromagnetic waves. Water, atmosphere, noise and electromagnetic radiation are recognized pollution which is difficult to treat in the world at present, and all countries pay huge investment for solving the problems. One of the most effective solutions to electromagnetic radiation pollution is to cover harmful sources or precision instruments with shielding materials to reduce the harm of electromagnetic waves. At present, the electromagnetic shielding materials which are commonly used are mainly classified into polymer composite materials and magnetic conductive materials, the polymer composite materials are low in strength and easy to age, and the traditional magnetic conductive materials are high in density and not easy to carry and use, so that the development of light high electromagnetic shielding materials is a necessary trend in the future. The magnesium alloy is the lightest metal structure material at present, has the characteristics of excellent heat conduction and electric conduction capability, high damping performance and excellent electromagnetic shielding performance, and is one of revolutionary materials in the new century. Generally, magnesium alloy is selected to replace aluminum alloy mainly by utilizing the characteristic of small density, is applied to parts which need to reduce weight urgently, and is designed from the aspect of strength, but functional characteristics of the alloy are usually ignored. In recent years, the development of the functional characteristics of magnesium alloys has been increasing, and typically there are heat conductive magnesium alloys, damping magnesium alloys, biomedical magnesium alloys, and the like, and the research and development of electromagnetic shielding magnesium alloys are in the initial stage. Theoretically, the magnesium alloy with the electromagnetic shielding function needs to have better electric conduction capability, and a typical alloy system is an Mg-Zn system, such as Mg-Zn-Ce system and Mg-Zn-Y system electromagnetic shielding magnesium alloys developed by Chen Chunhua professor of Chongqing university. At present, the research on magnesium alloy wires is limited, on one hand, the preparation and processing of the magnesium alloy wires are difficult, and on the other hand, the application range of the magnesium alloy wires is narrow, however, from the perspective of electromagnetic shielding structural materials, a magnesium alloy mesh composed of the magnesium alloy wires also has considerable advantages, and the application development in the future will be increased continuously.
Disclosure of Invention
The invention aims to provide a magnesium alloy with an electromagnetic shielding function and a magnesium alloy net made of the magnesium alloy, which is based on Mg-Zn base alloy and is added with Cu, Co and Y elements in proper amount.
The magnesium alloy with the electromagnetic shielding function comprises the following specific components in percentage by mass: 0.5-3.5%, Y: 0.2-1.5%, Cu: 0.2-1.0%, Co: 0.2-0.8%, wherein the total content of Cu and Co is not more than 1.5%, and the balance is Mg.
In the alloy, Zn is the main alloy element which does not basically influence the electric conduction and heat conduction capability of the alloy, and Y and Zn can form a quasicrystal phase to strengthen the alloy.
A magnesium alloy mesh with an electromagnetic shielding function is prepared from the components and the magnesium alloy in percentage by mass. The magnesium alloy is prepared into magnesium alloy wires, and the magnesium alloy wires are woven into a net, and the net is taken as a final product.
The invention also provides a preparation method of the magnesium alloy with the electromagnetic shielding function and a magnesium alloy mesh.
A preparation method of magnesium alloy with electromagnetic shielding function comprises the following steps:
(1) alloy smelting: proportioning according to the alloy components, wherein Cu and Co are added in a form of intermediate alloy, and other main alloy elements are added in pure metals; firstly, preheating a pure magnesium ingot and other main alloy elements to 300-450 ℃ for more than 5 min; then placing pure magnesium with the weight of 1/2-3/5 into a smelting furnace, raising the temperature to 700-750 ℃, adding protective gas at the moment, and after magnesium is molten, adding the rest magnesium ingot until the magnesium ingot is completely dissolved; sequentially adding preheated pure metal elements Zn and Y into a pure magnesium melt, stirring and standing at the same time, increasing the temperature of the melt to be more than 800 ℃, adding a Cu intermediate alloy and a Co intermediate alloy, continuously preserving heat after all the added metal is melted, keeping the temperature for 60-100 minutes, then cooling to 700-720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 600-650 ℃;
(2) homogenizing: and (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 320-400 ℃, preserving heat for 10-50 h, then continuously heating to 400-450 ℃, and preserving heat for 5-50 h.
In the step (1), the Cu intermediate alloy is Mg-20Cu, and the Co intermediate alloy is Mg-10 Co. Preheating time of pure magnesium ingot and main additive elements is generally 15min-20min to ensure main sourceThe surface of the material has no water vapor. The protective gas is Ar and SF6The volume ratio of the mixture (2) is 10-20: 1. The extrusion ratio of the semi-solid extrusion is more than 20.
A preparation method of a magnesium alloy mesh with an electromagnetic shielding function comprises the following steps:
(1) plastic deformation of the alloy: according to the steps (1) and (2) in the method, cooling the prepared homogenized bar to 320-370 ℃, carrying out hot drawing or hot extrusion, reducing the diameter to 10-15 mm, then further carrying out rotary swaging, and continuously annealing in the rotary swaging process to obtain a wire with the diameter of 0.2-1.0 mm;
(2) netting: and (4) netting the obtained magnesium alloy wire.
In the step (2), the mesh number of the netting is 10-80 meshes; the netting can be an artificial netting or a machine netting, and the netting can be directly used or subjected to bending treatment after being woven.
The invention has the advantages that: the alloy has better electromagnetic shielding performance, can further reduce the weight of the whole structural member on the basis of the existing sealing material, has the shielding effectiveness actually measured by a typical member reaching more than 60dB, and can be applied to the military industry.
Detailed Description
The invention relates to a preparation method of a magnesium alloy mesh with an electromagnetic shielding function, which comprises the following specific preparation processes:
1. and (4) alloy smelting. The alloy components are proportioned, wherein Cu and Co are added in a form of intermediate alloy, and other main alloy elements are added in pure metals. The Cu intermediate alloy is Mg-20Cu, and the Co intermediate alloy is Mg-10 Co. Firstly, preheating a pure magnesium ingot and main additive elements to 300-450 ℃ for more than 5min (generally 15-20 min), and ensuring that no water vapor exists on the surface of the main raw material. Then placing pure magnesium 1/2-3/5 weight parts into a smelting furnace, raising the temperature to 700-750 ℃, and adding protective gas, wherein the protective gas is Ar and SF6The volume ratio of the mixture is 10-20: 1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. The preheated pure metal elements are sequentially added into the pure magnesium melt and stirred simultaneouslyAnd standing, raising the temperature of the melt to be more than 800 ℃, adding the rest intermediate alloy, keeping the temperature for 60-100 minutes after all the added metal is melted, then cooling to 700-720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and beginning to perform semi-solid extrusion when the temperature reaches 600-650 ℃, wherein the extrusion ratio is more than 20.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 320-400 ℃, preserving heat for 10-50 h, then continuously heating to 400-450 ℃, and continuously preserving heat for 5-50 h.
3. The alloy is plastically deformed. And cooling the homogenized bar to 320-370 ℃, carrying out hot drawing or hot extrusion, reducing the diameter to 10-15 mm, and then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of the final product is about 0.2-1.0 mm.
4. And (6) netting. The obtained magnesium alloy wire is woven into a net with the mesh number of 10-80 meshes. The netting can be artificial netting or machine netting, and can be bent after netting or directly used.
Example 1
The alloy composition smelted in the embodiment is Mg-0.5Zn-0.2Y-0.6Cu-0.3Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in table 1.
TABLE 1 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 300 ℃ for 20min to ensure that the surface of the main raw material has no water vapor. Then placing 1/2 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 700 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (10) is 10:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat for 60 minutes after all the added metal is melted, then cooling to 710 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 600 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 320 ℃, preserving heat for 50h, then continuously heating to 400 ℃, and continuously preserving heat for 50 h.
3. The alloy is plastically deformed. And cooling the homogenized bar to 320 ℃, carrying out hot drawing, reducing the diameter to 15mm, and then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 1.0 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 10 meshes. The net is an artificial net, and the bending treatment is carried out after the net is woven.
Example 2
The alloy composition smelted in the embodiment is Mg-1.0Zn-1.5Y-0.6Cu-0.3Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 2.
TABLE 2 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 300 ℃ for 20min to ensure that the surface of the main raw material has no water vapor. Then placing 1/2 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 700 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (10) is 10:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat for 60 minutes after all the added metal is melted, then cooling to 720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 600 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 320 ℃, preserving heat for 50h, then continuously heating to 400 ℃, and continuously preserving heat for 50 h.
3. The alloy is plastically deformed. And cooling the homogenized bar to 320 ℃, carrying out hot drawing, reducing the diameter to 15mm, and then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 1.0 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 80 meshes. The net weaving is an artificial net weaving, and the bending treatment is carried out after the net weaving.
Example 3
The alloy composition smelted in the embodiment is Mg-1.0Zn-0.6Y-0.2Cu-0.8Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 3.
TABLE 3 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 340 ℃ for 20min to ensure that the surface of the main raw material has no water vapor. Then placing 1/2 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 720 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (10) is 10:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 70 minutes, then cooling to 720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 610 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 340 ℃, preserving heat for 40h, then continuously heating to 410 ℃, and continuously preserving heat for 40 h.
3. The alloy is plastically deformed. And (3) cooling the homogenized bar to 340 ℃, carrying out hot drawing, reducing the diameter to 14mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.8 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a mesh with the mesh number of 70. The net is an artificial net, and the bending treatment is carried out after the net is woven.
Example 4
The alloy composition smelted in the embodiment is Mg-1.5Zn-1.5Y-0.6Cu-0.3Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 4.
TABLE 4 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 340 ℃ for 20min to ensure that the surface of the main raw material has no water vapor. Then placing 1/2 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 720 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (10) is 10:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 70 minutes, then cooling to 710 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 610 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 340 ℃, preserving heat for 40h, then continuously heating to 410 ℃, and continuously preserving heat for 40 h.
3. The alloy is plastically deformed. And (3) cooling the homogenized bar to 340 ℃, carrying out hot drawing, reducing the diameter to 14mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.8 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 30 meshes. The net is an artificial net, and the bending treatment is carried out after the net is woven.
Example 5
The alloy composition smelted in the embodiment is Mg-2.0Zn-0.6Y-0.8Cu-0.6Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 5.
TABLE 5 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 380 ℃ for 15min to ensure that the surface of the main raw material has no water vapor. Then placing 3/5 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 730 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (15) is 15:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 80 minutes, then cooling to 705 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 630 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 360 ℃, preserving heat for 30h, then continuously heating to 425 ℃, and continuously preserving heat for 30 h.
3. The alloy is plastically deformed. And (3) cooling the homogenized bar to 350 ℃, carrying out hot drawing, reducing the diameter to 13mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.6 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 80 meshes. The net is an artificial net, and the bending treatment is carried out after the net is woven.
Example 6
The alloy composition smelted in the embodiment is Mg-2.0Zn-1.0Y-1.0Cu-0.2Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 6.
TABLE 6 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 380 ℃ for 15min to ensure that the surface of the main raw material has no water vapor. Then placing 3/5 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 730 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (15) is 15:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 80 minutes, then cooling to 720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 630 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 360 ℃, preserving heat for 30h, then continuously heating to 425 ℃, and continuously preserving heat for 30 h.
3. The alloy is plastically deformed. And cooling the homogenized bar to 350 ℃, carrying out hot extrusion, reducing the diameter to 13mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.6 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 80 meshes. The net is woven by a machine and is directly used after being woven.
Example 7
The alloy composition smelted in the embodiment is Mg-3.0Zn-1.2Y-0.6Cu-0.3Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 7.
TABLE 7 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 420 ℃ for 15min to ensure that the surface of the main raw material has no water vapor. Then placing 3/5 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 740 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (20) is 20:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. Sequentially adding preheated pure metal elements into the pure magnesium melt, stirring and standing, raising the temperature of the melt to 805 ℃, adding the rest intermediate alloy and gold to be addedAnd after the molten aluminum is completely melted, continuously preserving heat for 90 minutes, then cooling to 715 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting to perform semi-solid extrusion when the temperature reaches 640 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 380 ℃, preserving heat for 20 hours, then continuously heating to 440 ℃, and continuously preserving heat for 15 hours.
3. The alloy is plastically deformed. And cooling the homogenized bar to 360 ℃, carrying out hot extrusion, reducing the diameter to 12mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.4 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a mesh with the mesh number of 60. The net is woven by a machine and is directly used after being woven.
Example 8
The alloy composition smelted in the embodiment is Mg-3.0Zn-0.2Y-0.6Cu-0.3Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 8.
TABLE 8 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 420 ℃ for 15min to ensure that the surface of the main raw material has no water vapor. Then placing 3/5 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 740 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of (A) to (B) is 20:1,after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 90 minutes, then cooling to 720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 640 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 380 ℃, preserving heat for 20 hours, then continuously heating to 440 ℃, and continuously preserving heat for 15 hours.
3. The alloy is plastically deformed. And cooling the homogenized bar to 360 ℃, carrying out hot extrusion, reducing the diameter to 12mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.4 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a mesh with the mesh number of 70. The net is woven by a machine and is directly used after being woven.
Example 9
The alloy composition smelted in the embodiment is Mg-3.5Zn-0.6Y-0.6Cu-0.4Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 9.
TABLE 9 alloy design composition and actual raw material addition
Firstly, preheating pure magnesium ingot and main additive elements to 450 ℃, and holdingContinuing for 10min to ensure no water vapor on the surface of the main raw material. Then placing 3/5 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 750 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (20) is 20:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 100 minutes, then cooling to 720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 650 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 400 ℃, preserving heat for 10 hours, then continuously heating to 450 ℃, and continuously preserving heat for 5 hours.
3. The alloy is plastically deformed. And cooling the homogenized bar to 370 ℃, carrying out hot extrusion, reducing the diameter to 10mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.2 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 80 meshes. The net is woven by a machine and is directly used after being woven.
Example 10
The alloy composition smelted in the embodiment is Mg-3.5Zn-0.6Y-1.0Cu-0.5Co (wt.%). According to the experimental material consumption and the crucible size, the experimental design is used for smelting 100 kg.
1. Alloy smelting: the alloy components are proportioned, wherein Cu and Co are added in the form of intermediate alloys Mg-20Cu and Mg-10Co respectively, and other main alloy elements are added in pure metals. In order to ensure quick melting, the raw materials are cut into small pieces, the small pieces are smoothly put into a crucible, oil stains on the surface are removed, and an oxide layer is removed by polishing with abrasive paper. The alloy composition and the raw material addition amount were designed in consideration of the loss of alloy elements during melting, as shown in Table 10.
TABLE 10 alloy design composition and actual raw material addition
Firstly, preheating a pure magnesium ingot and main additive elements to 450 ℃ for 10min to ensure that the surface of the main raw material has no water vapor. Then placing 3/5 weight of pure magnesium into a smelting furnace, simultaneously raising the temperature to 750 ℃, and adding protective gas at the moment, wherein the protective gas is specifically Ar and SF6The volume ratio of the mixture of (1) to (20) is 20:1, and after all magnesium is melted, the rest magnesium ingot is added until all magnesium is dissolved. And sequentially adding the preheated pure metal elements into the pure magnesium melt, stirring and standing, increasing the temperature of the melt to 805 ℃, adding the rest intermediate alloy, continuously preserving heat after all the added metal is melted, preserving the heat for 100 minutes, then cooling to 706 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 650 ℃, wherein the extrusion ratio is 25.
2. And (4) homogenizing. And (3) placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 400 ℃, preserving heat for 10 hours, then continuously heating to 450 ℃, and continuously preserving heat for 5 hours.
3. The alloy is plastically deformed. And cooling the homogenized bar to 370 ℃, carrying out hot extrusion, reducing the diameter to 10mm, then further carrying out rotary swaging, wherein continuous annealing is required in the rotary swaging process, and the diameter of a final product is about 0.2 mm.
4. And (6) netting. The obtained magnesium alloy wire material is woven into a net with the mesh number of 80 meshes. The net is woven by a machine and is directly used after being woven.
TABLE 11 fracture Strength and Shielding effectiveness of the magnesium alloy webs prepared in examples 1-10
The actual measurement of the shielding effectiveness of the typical component of the magnesium alloy mesh prepared by the embodiment of the invention reaches more than 60dB, and the magnesium alloy mesh has better electromagnetic shielding performance.
Claims (8)
1. A magnesium alloy net with electromagnetic shielding function is characterized in that: the magnesium alloy comprises the following components in percentage by mass: 0.5-3.5%, Y: 0.2-1.5%, Cu: 0.2-1.0%, Co: 0.2-0.8%, wherein the total content of Cu and Co is not more than 1.5%, and the balance is Mg;
the preparation method of the magnesium alloy mesh comprises the following steps:
(1) alloy smelting: proportioning according to the alloy components, wherein Cu and Co are added in a form of intermediate alloy, and Zn and Y are added in pure metal; firstly, preheating magnesium ingot, Zn and Y to 300-450 ℃ for more than 5 min; then, placing pure magnesium 1/2-3/5 in weight into a smelting furnace, raising the temperature to 700-750 ℃, adding protective gas, and after magnesium is molten, adding the rest magnesium ingots until the magnesium is completely molten; sequentially adding preheated Zn and Y into a pure magnesium melt, stirring and standing at the same time, increasing the temperature of the melt to be more than 800 ℃, adding a Cu intermediate alloy and a Co intermediate alloy, continuously preserving heat after all the Zn and the Y are melted, keeping the temperature for 60-100 minutes, then cooling to 700-720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 600-650 ℃;
(2) homogenizing: placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 320-400 ℃, preserving heat for 10-50 h, then continuously heating to 400-450 ℃, and preserving heat for 5-50 h;
(3) plastic deformation of the alloy: cooling the homogenized bar to 320-370 ℃, carrying out hot drawing or hot extrusion, reducing the diameter to 10-15 mm, then carrying out rotary swaging, and continuously annealing in the rotary swaging process to obtain a wire with the diameter of 0.2-1.0 mm;
(4) netting: and (4) netting the obtained magnesium alloy wire.
2. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 1, comprising the steps of:
(1) alloy smelting: proportioning according to the alloy components, wherein Cu and Co are added in a form of intermediate alloy, and Zn and Y are added in pure metal; firstly, preheating magnesium ingot, Zn and Y to 300-450 ℃ for more than 5 min; then, placing pure magnesium 1/2-3/5 in weight into a smelting furnace, raising the temperature to 700-750 ℃, adding protective gas, and after magnesium is molten, adding the rest magnesium ingots until the magnesium is completely dissolved; sequentially adding preheated Zn and Y into a pure magnesium melt, stirring and standing, increasing the temperature of the melt to be more than 800 ℃, adding a Cu intermediate alloy and a Co intermediate alloy, continuously preserving heat after all added metals are molten, keeping the temperature for 60-100 minutes, then cooling to 700-720 ℃, filtering, casting into a semi-solid extrusion cylinder, continuously cooling, and starting semi-solid extrusion when the temperature reaches 600-650 ℃;
(2) homogenizing: placing the bar subjected to semi-solid extrusion in a homogenizing heat treatment furnace, heating to 320-400 ℃, preserving heat for 10-50 h, then continuously heating to 400-450 ℃, and preserving heat for 5-50 h;
(3) plastic deformation of the alloy: cooling the homogenized bar to 320-370 ℃, carrying out hot drawing or hot extrusion, reducing the diameter to 10-15 mm, then carrying out rotary swaging, and continuously annealing in the rotary swaging process to obtain a wire with the diameter of 0.2-1.0 mm;
(4) netting: and (4) netting the obtained magnesium alloy wire.
3. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 2, wherein: the Cu intermediate alloy is Mg-20Cu, and the Co intermediate alloy is Mg-10 Co.
4. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 2, wherein: preheating magnesium ingot, Zn and Y for 15-20 min.
5. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 2, wherein: the protective gas is Ar and SF6The volume ratio of the mixture (2) to the mixture (1) is 10-20: 1.
6. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 2, wherein: the extrusion ratio of the semi-solid extrusion is more than 20.
7. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 2, wherein: the mesh number of the netting is 10-80 meshes.
8. The method for preparing a magnesium alloy mesh with an electromagnetic shielding function according to claim 2, wherein: the net is woven manually or mechanically, and is used directly or bent after being woven.
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