CN113444947A - Heat-resistant magnesium alloy with high electromagnetic shielding performance and preparation method thereof - Google Patents
Heat-resistant magnesium alloy with high electromagnetic shielding performance 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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- 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
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- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
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- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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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
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- H05K9/0081—Electromagnetic shielding materials, e.g. EMI, RFI shielding
Abstract
The invention relates to a heat-resistant magnesium alloy with high electromagnetic shielding performance and a preparation method thereof, belonging to the technical field of magnesium alloy preparation. The invention provides a heat-resistant magnesium alloy with high electromagnetic shielding performance, which is formed by adding Gd, Y and Sn elements to be combined with Mg to form Mg-Gd-Y, Mg2The high-melting-point second phase such as Sn can provide a nucleation point in the solidification process of the alloy, reduce the grain size of the alloy and play a role in fine grain strengthening; while due to the formation of a second phaseAfter hot extrusion, the rare earth phases are crushed into small particles in a magnesium matrix to play a role in dispersion strengthening, and the rare earth phases have higher melting points and thermal stability and still can play a certain strengthening effect at 200 ℃.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy preparation, and relates to a heat-resistant magnesium alloy with high electromagnetic shielding performance and a preparation method thereof.
Background
The magnesium alloy is the lightest metal structure material in the current engineering application, the density of the magnesium alloy is only equal to 2/3 of aluminum, 1/4 of steel, the magnesium alloy has the advantages of high specific strength, large specific elastic modulus, good damping and shock absorption performance, good thermal conductivity, good electrostatic shielding performance, low density and the like, and the magnesium alloy has important application value and wide application prospect in the industries of aerospace, vehicles, 3C and the like. Although magnesium alloys have many advantages, their strength rapidly decreases at temperatures above 125 ℃, greatly limiting their potential applications.
For this reason, the development and research of heat-resistant magnesium alloys suitable for various application temperature ranges have been a hot spot in their research and application fields. Meanwhile, with the rapid update of electronic products, electromagnetic waves generated by electronic equipment fill living and working spaces, and excessive electromagnetic radiation causes electromagnetic pollution. Electromagnetic shielding is the most effective protection measure, is increasingly important, has become the key point of research in various countries, and is an extremely important link for developing high-performance shielding materials. Magnesium is the most light environment-friendly engineering structure material at present, has better electromagnetic shielding performance, is a potential electromagnetic shielding material, improves the electromagnetic shielding performance of magnesium alloy, and has important significance for expanding the industrial application of the magnesium alloy.
At present, the design and development of the heat-resistant magnesium alloy generally comprehensively uses methods such as solid solution strengthening, second phase strengthening, fine grain strengthening and the like on the basis of alloying, and the high-temperature performance of the heat-resistant magnesium alloy is improved by jointly strengthening a matrix and a crystal boundary and preventing the sliding and dislocation movement of the crystal boundary. The research of magnesium alloy containing Rare Earth (RE) is an important field of the research of heat-resistant magnesium alloy. London et al found that the addition of Y element can significantly improve the performance of magnesium alloy. Meanwhile, Mordike and the like research that the high-temperature performance of the alloy can be obviously improved by adding Nd element into Mg-Y alloy. The typical components of the Mg-Y-mixed rare earth series heat-resistant alloy which is successfully developed at present are WE54 and WE43, and the two alloys have very excellent comprehensive mechanical properties and can be applied to the high-temperature environment of 200-250 ℃. Subsequently, researches of many scholars find that excellent mechanical properties can be obtained after Gd and Dy are added into the alloy, and particularly when the addition amount is more than 10%, researches of Drits and the like find that the Mg-Gd-Y alloy has good comprehensive mechanical properties at room temperature and high temperature, and meanwhile, the heat resistance of the Mg-Gd-Y alloy is superior to that of WE alloy series. Although the alloys have excellent mechanical properties, the high rare earth content of the alloys causes high preparation cost of the alloys and is difficult to meet industrial requirements, so that the content of rare earth elements is reduced by using other elements, the mechanical properties of the alloys are improved, the production cost is reduced, and further application of the magnesium alloys can be promoted.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a heat-resistant magnesium alloy with high electromagnetic shielding performance; the second purpose of the present invention is to provide a method for preparing a heat-resistant magnesium alloy with high electromagnetic shielding performance.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a heat-resistant magnesium alloy with high electromagnetic shielding performance and a preparation method thereof are disclosed, wherein the heat-resistant magnesium alloy comprises the following components in percentage by weight: 11.5-13.1 wt.% of Gd, 2.6-3.5 wt.% of Y, 0-1.1 wt.% of Sn, less than or equal to 0.02 wt.% of unavoidable impurities, and the balance of Mg.
2. The preparation method of the heat-resistant magnesium alloy comprises the following steps:
(1) preheating a crucible in a smelting furnace at 450-500 ℃, and introducing protective gas;
(2) placing a pure magnesium ingot in a preheated crucible, heating to 730-750 ℃, smelting to be completely molten, and removing slag on the surface of a melt;
(3) after the temperature of the melt is raised to 730-750 ℃ and stabilized, adding Mg-Gd intermediate alloy for continuous melting;
(4) after the Mg-Gd intermediate alloy is melted, continuously raising the temperature of the melt to 730-750 ℃, and after the melt is stabilized, adding the Mg-Y intermediate alloy for continuous melting;
(5) after the Mg-Y intermediate alloy is melted, continuing to raise the temperature of the melt to 730-750 ℃, adding a pure tin ingot to melt the melt, and cleaning slag on the surface of the melt;
(6) stirring the melt for 3-8 min to uniformly distribute alloy elements, then reducing the furnace temperature to 710-730 ℃, preserving the temperature for 15-30 min, fishing floating slag on the surface of the melt after standing, and cooling by water to obtain an ingot;
(7) sawing the cast ingot, pulling the ingot to a required size, homogenizing at 500-530 ℃, and preserving heat for 10-15 h;
(8) preheating the product obtained in the step (7) and an extrusion die at 390-410 ℃ for 2-3 h, carrying out hot extrusion, and carrying out aging treatment to obtain the heat-resistant magnesium alloy with high electromagnetic shielding performance.
Preferably, the purity of the pure magnesium ingot is greater than or equal to 99.8%, and the purity of the pure tin ingot is greater than or equal to 99.9%.
Preferably, the protective gas consists of CO in a volume ratio of 99:12And SF6Mixing the components.
Preferably, the weight percentage of Gd in the Mg-Gd intermediate alloy is 30%, and the weight percentage of Gd in the Mg-Y intermediate alloy is 30%.
Preferably, the hot extrusion conditions are: the hot extrusion temperature is 390-420 ℃, the hot extrusion ratio is 10: 1-11: 1, and the hot extrusion speed is 1.00-1.50 m/min.
Preferably, the aging treatment is specifically performed for 32-40 hours at the temperature of 220-245 ℃.
The invention has the beneficial effects that:
1. the invention provides a heat-resistant magnesium alloy with high electromagnetic shielding performance, which is formed by adding Gd, Y and Sn elements to be combined with Mg to form Mg-Gd-Y, Mg2The high-melting-point second phase such as Sn can provide a nucleation point in the solidification process of the alloy, reduce the grain size of the alloy and play a role in fine grain strengthening; meanwhile, the second phase formed after hot extrusion is inThe magnesium matrix is crushed into small particles to play a role in dispersion strengthening, the rare earth phases have higher melting point and thermal stability, a certain strengthening effect can still be achieved at 200 ℃, after hot extrusion and aging treatment, the tensile strength at 200 ℃ can reach 415MPa, which is far higher than that of the heat-resistant magnesium alloy WE54 in current commercial application, meanwhile, the electromagnetic shielding performance of the as-cast alloy after aging treatment reaches 69-105 dB, the requirement of national defense and military equipment and aerospace equipment on the electromagnetic shielding performance being more than 60dB is met, and therefore the use potential of the magnesium alloy material is fully developed.
2. The invention also provides a preparation method of the heat-resistant magnesium alloy with high electromagnetic shielding performance, which has the characteristics of simple process and easy operation and regulation; in addition, the preparation method of the invention adopts conventional general equipment such as a smelting furnace, a hot extruder and the like, and has the characteristics of strong portability and easy industrial application.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Example 1
The heat-resistant magnesium alloy with high electromagnetic shielding performance is prepared from Mg, Gd and Y, and comprises the following components in percentage by mass: gd: 11.88 percent of Mg, 2.73 percent of Y and the balance of Mg and inevitable impurities (such as Fe, Si and the like) of which the weight percentage is less than or equal to 0.02 percent, wherein the raw materials required to be added in the preparation process of the magnesium alloy are pure magnesium ingots, Mg-Gd intermediate alloys and Mg-Y intermediate alloys with the purity of more than or equal to 99.8 percent, and the specific preparation method is as follows:
(1) preheating a crucible in a smelting furnace at 450 ℃, and introducing protective gas (prepared from CO with a volume ratio of 99: 1)2And SF6Mixed together);
(2) placing a pure magnesium ingot (the purity is more than or equal to 99.8%) in a preheated crucible, heating to 730 ℃, and smelting to be completely molten, so as to clear molten slag on the surface of the melt;
(3) after the temperature of the melt is raised to 730 ℃ and stabilized, adding Mg-Gd intermediate alloy to continue melting;
(4) after the Mg-Gd intermediate alloy is melted, continuously raising the temperature of the melt to 730 ℃, stabilizing the melt, and then adding the Mg-Y intermediate alloy for continuous melting;
(5) stirring the melt for 3-8 min to uniformly distribute alloy elements, then cooling the furnace to 710 ℃, preserving the temperature for 30min, fishing floating slag on the surface of the melt after standing, and cooling by water to obtain an ingot;
(6) sawing the cast ingot, pulling the ingot to a required size, homogenizing at 500 ℃, and preserving heat for 15 h;
(7) preheating the product obtained in the step (6) and an extrusion die at 390 ℃ for 3h, then carrying out hot extrusion (the hot extrusion conditions are that the hot extrusion temperature is 390 ℃, the hot extrusion ratio is 10:1, and the hot extrusion speed is 1.00m/min), and then carrying out aging treatment (specifically, carrying out aging treatment at 220 ℃ for 40h) to obtain the heat-resistant magnesium alloy.
Example 2
The heat-resistant magnesium alloy with high electromagnetic shielding performance is prepared from Mg, Gd, Y and Sn, and comprises the following components in percentage by mass: gd: 12.31 percent, Y2.93 percent and Sn 0.25 percent, and the balance of Mg and inevitable impurities (the inevitable impurities are Fe, Si and the like) which are less than or equal to 0.02wt percent, wherein the raw materials required to be added in the preparation process of the magnesium alloy comprise pure magnesium ingots with the purity of more than or equal to 99.8 percent, Mg-Gd intermediate alloys, Mg-Y intermediate alloys and pure tin ingots with the purity of more than or equal to 99.9 percent, and the specific preparation method is as follows:
(1) preheating a crucible in a smelting furnace at 500 ℃, and introducing protective gas (prepared from CO with a volume ratio of 99: 1)2And SF6Mixed together);
(2) placing a pure magnesium ingot (the purity is more than or equal to 99.8%) in a preheated crucible, heating to 750 ℃ and smelting to be completely molten, and clearing slag on the surface of the melt;
(3) after the temperature of the melt is raised to 750 ℃ and stabilized, adding Mg-Gd intermediate alloy for continuous melting;
(4) after the Mg-Gd intermediate alloy is melted, continuously raising the temperature of the melt to 750 ℃, stabilizing the melt, and then adding the Mg-Y intermediate alloy for continuous melting;
(5) after the Mg-Y intermediate alloy is melted, continuing to raise the temperature of the melt to 750 ℃, adding a pure tin ingot (the purity is more than or equal to 99.9%) to melt the pure tin ingot, and clearly cleaning slag on the surface of the melt;
(6) stirring the melt for 3min to ensure that the alloy elements are uniformly distributed, then reducing the furnace temperature to 730 ℃, preserving the temperature for 15min, fishing floating slag on the surface of the melt after standing, and cooling by water to obtain an ingot;
(7) sawing the cast ingot, pulling the ingot to a required size, homogenizing at 530 ℃, and preserving heat for 10 hours;
(8) preheating the product obtained in the step (7) and an extrusion die at 410 ℃ for 2h, then carrying out hot extrusion (the hot extrusion conditions are that the hot extrusion temperature is 420 ℃, the hot extrusion ratio is 11:1, and the hot extrusion speed is 1.50m/min), and then carrying out aging treatment (specifically, carrying out aging treatment at 245 ℃ for 32h) to obtain the heat-resistant magnesium alloy.
Example 3
The heat-resistant magnesium alloy with high electromagnetic shielding performance is prepared from Mg, Gd, Y and Sn, and comprises the following components in percentage by mass: gd: 12.46 percent, Y3.22 percent and Sn 0.57 percent, and the balance of Mg and inevitable impurities (the inevitable impurities are Fe, Si and the like) which are less than or equal to 0.02wt percent, wherein the raw materials required to be added in the preparation process of the magnesium alloy comprise pure magnesium ingots with the purity of more than or equal to 99.8 percent, Mg-Gd intermediate alloys, Mg-Y intermediate alloys and pure tin ingots with the purity of more than or equal to 99.9 percent, and the specific preparation method is as follows:
(1) preheating a crucible in a 480 ℃ smelting furnace, and introducing protective gas (composed of CO with the volume ratio of 99: 1)2And SF6Mixed together);
(2) placing a pure magnesium ingot (the purity is more than or equal to 99.8%) in a preheated crucible, heating to 740 ℃, and smelting to be completely molten, and clearing slag on the surface of the melt;
(3) after the temperature of the melt is increased to 740 ℃ and stabilized, adding Mg-Gd intermediate alloy for continuous melting;
(4) after the Mg-Gd intermediate alloy is melted, continuously raising the temperature of the melt to 740 ℃, stabilizing the melt, and then adding the Mg-Y intermediate alloy for continuous melting;
(5) after the Mg-Y intermediate alloy is melted, continuing to raise the temperature of the melt to 740 ℃, adding a pure tin ingot (the purity is more than or equal to 99.9%) to melt the pure tin ingot, and clearly cleaning slag on the surface of the melt;
(6) stirring the melt for 5min to ensure that the alloy elements are uniformly distributed, then reducing the furnace temperature to 720 ℃, preserving the temperature for 20min, fishing floating slag on the surface of the melt after standing, and cooling with water to obtain an ingot;
(7) sawing the cast ingot, pulling the ingot to a required size, homogenizing at 500-530 ℃, and preserving heat for 10-15 h;
(8) preheating the product in the step (7) and an extrusion die at 400 ℃ for 2.5h, then carrying out hot extrusion (the hot extrusion conditions are that the hot extrusion temperature is 400 ℃, the hot extrusion ratio is 10.5:1, and the hot extrusion speed is 1.30m/min), and then carrying out aging treatment (specifically, carrying out aging treatment at 240 ℃ for 35h) to obtain the heat-resistant magnesium alloy.
Example 4
The heat-resistant magnesium alloy with high electromagnetic shielding performance is prepared from Mg, Gd, Y and Sn, and comprises the following components in percentage by mass: gd: 12.63%, Y3.35% and Sn 0.89%, the balance being Mg and unavoidable impurities (Fe, Si, etc.) of 0.02 wt.% or less, and the raw materials to be added in the preparation process of the magnesium alloy are a pure magnesium ingot with a purity of 99.8% or more, an Mg-Gd master alloy, an Mg-Y master alloy and a pure tin ingot with a purity of 99.9% or more, and the specific preparation method is as follows:
(1) preheating a crucible in a smelting furnace at 500 ℃, and introducing protective gas (prepared from CO with a volume ratio of 99: 1)2And SF6Mixed together);
(2) placing a pure magnesium ingot (the purity is more than or equal to 99.8%) in a preheated crucible, heating to 750 ℃ and smelting to be completely molten, and clearing slag on the surface of the melt;
(3) after the temperature of the melt is raised to 750 ℃ and stabilized, adding Mg-Gd intermediate alloy for continuous melting;
(4) after the Mg-Gd intermediate alloy is melted, continuously raising the temperature of the melt to 730 ℃, stabilizing the melt, and then adding the Mg-Y intermediate alloy for continuous melting;
(5) after the Mg-Y intermediate alloy is melted, continuously raising the temperature of the melt to 745 ℃, adding pure tin ingots (the purity is more than or equal to 99.9%) to melt the pure tin ingots, and clearly cleaning slag on the surface of the melt;
(6) stirring the melt for 3min to ensure that the alloy elements are uniformly distributed, then reducing the furnace temperature to 710 ℃, preserving the temperature for 20min, fishing floating slag on the surface of the melt after standing, and cooling by water to obtain an ingot;
2. sawing the cast ingot, pulling the ingot to a required size, homogenizing at 500 ℃, and preserving heat for 10 hours;
3. preheating the product obtained in the step (2) and an extrusion die at the temperature of 410 ℃ for 3h, then carrying out hot extrusion (the hot extrusion conditions are that the hot extrusion temperature is 390 ℃, the hot extrusion ratio is 11:1, and the hot extrusion speed is 1.00m/min), and then carrying out aging treatment (specifically, carrying out aging treatment at the temperature of 220 ℃ for 32h) to obtain the heat-resistant magnesium alloy.
Performance detection
1. And (3) testing mechanical properties:
the heat-resistant magnesium alloy extruded bars prepared in examples 1, 2, 3 and 4 were subjected to a room temperature and 200 ℃ high temperature tensile test after aging, and the results are shown in tables 1 and 2, respectively. For comparison, the mechanical property data of commercial heat-resistant magnesium alloy WE43 bar at room temperature and high temperature of 200 ℃ are given in tables 1 and 2.
TABLE 1 mechanical Properties at room temperature of examples 1, 2, 3, 4 and comparative example 1
| Examples | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
| 1 | 425 | 300 | 4.1 |
| 2 | 439 | 308 | 5.3 |
| 3 | 450 | 311 | 6.0 |
| 4 | 476 | 320 | 7.1 |
| WE43 alloy | 285 | 196 | 3.5 |
TABLE 2 high temperature mechanical properties of examples 1, 2, 3, 4 and comparative example 1
2. And (3) testing the electromagnetic shielding performance:
the electromagnetic shielding properties were measured at room temperature after aging of the heat-resistant magnesium alloys prepared in the above examples 1, 2, 3 and 4, and the measured properties are shown in table 3, along with the electromagnetic shielding properties of the commercial magnesium alloy ZK60 for comparison.
TABLE 3 electromagnetic shielding Properties of examples 1, 2, 3, 4 and comparative example 2
| Examples | Shielding effectiveness SE (dB) | SE/dB(f＝900MHz) | SE/dB(f＝1500MHz) |
| 1 | 74～107 | 90 | 74 |
| 2 | 76～109 | 93 | 76 |
| 3 | 77～110 | 94 | 77 |
| 4 | 81～112 | 97 | 81 |
| ZK60 alloy | 50～65 | 55 | 50 |
Through the performance tests, as can be seen from table 1, with the increase of the tin content, the yield strength and the tensile strength of the alloy are both obviously improved, on one hand, the second phase generated is gradually increased due to the addition of the tin element, and the second phase hinders dislocation motion, so that the strength of the alloy is improved; on the other hand, the formed second phase can provide nucleation points to promote the formation of crystal grains, and the strength of the magnesium alloy structure is improved after the magnesium alloy structure is refined. Meanwhile, as can be seen from table 2, the addition of tin is beneficial to improving the strength of the alloy at high temperature, and on one hand, the addition of tin reduces the grain size of the alloy, so that the fine grain strengthening effect can be achieved; on one hand, the formed second phase is crushed into small particles in the magnesium matrix after hot extrusion to play a role in dispersion strengthening, and the rare earth phases have higher melting point and thermal stability and still can play a certain strengthening effect at 200 ℃. It can be seen from table 3 that the electromagnetic shielding performance of the alloy is gradually enhanced with the increase of the tin content, because the increase of the tin content causes the increase of the second phase in the alloy, and the obstruction of the electromagnetic wave in the magnesium matrix is increased, thereby enhancing the reflection loss and enhancing the electromagnetic shielding performance of the alloy.
In conclusion, the invention provides the heat-resistant magnesium alloy with high electromagnetic shielding performance, which is formed by adding Gd, Y and Sn elements to be combined with Mg to form Mg-Gd-Y, Mg2The high-melting-point second phase such as Sn can provide a nucleation point in the solidification process of the alloy, reduce the grain size of the alloy and play a role in fine grain strengthening; meanwhile, the formed second phase is crushed into small particles in a magnesium matrix after hot extrusion to play a role in dispersion strengthening, the rare earth phases have higher melting point and thermal stability and still can play a certain strengthening effect at 200 ℃, after the hot extrusion and aging treatment, the tensile strength at 200 ℃ can reach 415MPa which is far higher than that of the heat-resistant magnesium alloy WE54 commercially applied at present, and meanwhile, the electromagnetic shielding performance of the as-cast alloy subjected to the aging treatment reaches 69-105 dB, so that the requirement of national defense military equipment and aerospace equipment on the electromagnetic shielding performance of more than 60dB is met, and the use potential of the magnesium alloy material is fully developed. The invention also provides a preparation method of the heat-resistant magnesium alloy with high electromagnetic shielding performance, which has the characteristics of simple process and easy operation and regulation; in addition, the preparation method of the invention adopts conventional general equipment such as a smelting furnace, a hot extruder and the like, and has the characteristics of strong portability and easy industrial application.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (7)
1. The heat-resistant magnesium alloy with high electromagnetic shielding performance and the preparation method thereof are characterized in that the heat-resistant magnesium alloy comprises the following components in percentage by weight: 11.5-13.1 wt.% of Gd, 2.6-3.5 wt.% of Y, 0-1.1 wt.% of Sn, less than or equal to 0.02 wt.% of unavoidable impurities, and the balance of Mg.
2. The method for preparing a heat-resistant magnesium alloy according to claim 1, wherein the method comprises the steps of:
(1) preheating a crucible in a smelting furnace at 450-500 ℃, and introducing protective gas;
(2) placing a pure magnesium ingot in a preheated crucible, heating to 730-750 ℃, smelting to be completely molten, and removing slag on the surface of a melt;
(3) after the temperature of the melt is raised to 730-750 ℃ and stabilized, adding Mg-Gd intermediate alloy for continuous melting;
(4) after the Mg-Gd intermediate alloy is melted, continuously raising the temperature of the melt to 730-750 ℃, and after the melt is stabilized, adding the Mg-Y intermediate alloy for continuous melting;
(5) after the Mg-Y intermediate alloy is melted, continuing to raise the temperature of the melt to 730-750 ℃, adding a pure tin ingot to melt the melt, and cleaning slag on the surface of the melt;
(6) stirring the melt for 3-8 min to uniformly distribute alloy elements, then reducing the furnace temperature to 710-730 ℃, preserving the temperature for 15-30 min, fishing floating slag on the surface of the melt after standing, and cooling by water to obtain an ingot;
(7) sawing the cast ingot, pulling the ingot to a required size, homogenizing at 500-530 ℃, and preserving heat for 10-15 h;
(8) preheating the product obtained in the step (7) and an extrusion die at 390-410 ℃ for 2-3 h, carrying out hot extrusion, and carrying out aging treatment to obtain the heat-resistant magnesium alloy with high electromagnetic shielding performance.
3. The method according to claim 2, wherein the purity of the pure magnesium ingot is 99.8% or more, and the purity of the pure tin ingot is 99.9% or more.
4. The method of claim 2, wherein the shielding gas is composed of 99:1 by volume of CO2And SF6Mixing the components.
5. The method of claim 2, wherein the Mg-Gd intermediate alloy has 30% Gd by weight and the Mg-Y intermediate alloy has 30% Gd by weight.
6. The production method according to claim 2, wherein the conditions of the hot extrusion are: the hot extrusion temperature is 390-420 ℃, the hot extrusion ratio is 10: 1-11: 1, and the hot extrusion speed is 1.00-1.50 m/min.
7. The preparation method according to claim 2, wherein the aging treatment is specifically performed at a temperature of 220-245 ℃ for 32-40 h.
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| CN113444947B (en) | 2023-02-28 |
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