CN114686713A - Preparation process of alkaline earth heat-resistant magnesium alloy ingot - Google Patents
Preparation process of alkaline earth heat-resistant magnesium alloy ingot Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 111
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 63
- 239000000956 alloy Substances 0.000 claims abstract description 63
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 62
- 239000007788 liquid Substances 0.000 claims abstract description 48
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 44
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 43
- 238000007670 refining Methods 0.000 claims abstract description 40
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011777 magnesium Substances 0.000 claims abstract description 35
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 33
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 32
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000003723 Smelting Methods 0.000 claims abstract description 27
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 23
- 239000011888 foil Substances 0.000 claims abstract description 21
- 238000000576 coating method Methods 0.000 claims abstract description 20
- 239000011248 coating agent Substances 0.000 claims abstract description 19
- 239000011787 zinc oxide Substances 0.000 claims abstract description 18
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 229910052748 manganese Inorganic materials 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims description 35
- 238000003756 stirring Methods 0.000 claims description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 26
- 238000010438 heat treatment Methods 0.000 claims description 25
- 229910052725 zinc Inorganic materials 0.000 claims description 20
- 239000011701 zinc Substances 0.000 claims description 20
- 235000019353 potassium silicate Nutrition 0.000 claims description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 16
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 15
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 claims description 14
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 239000010439 graphite Substances 0.000 claims description 13
- 229910002804 graphite Inorganic materials 0.000 claims description 13
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 12
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 9
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 8
- 239000001110 calcium chloride Substances 0.000 claims description 8
- 229910001628 calcium chloride Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000000843 powder Substances 0.000 claims description 8
- 229910001626 barium chloride Inorganic materials 0.000 claims description 7
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 7
- 239000011780 sodium chloride Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 4
- 238000007873 sieving Methods 0.000 claims description 4
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 claims description 3
- 238000003825 pressing Methods 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims 1
- 235000012222 talc Nutrition 0.000 claims 1
- 229910052623 talc Inorganic materials 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 18
- 230000008569 process Effects 0.000 abstract description 17
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 description 25
- 238000005266 casting Methods 0.000 description 17
- 230000003647 oxidation Effects 0.000 description 13
- 238000007254 oxidation reaction Methods 0.000 description 13
- 229910052761 rare earth metal Inorganic materials 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 9
- 239000000243 solution Substances 0.000 description 8
- 238000005728 strengthening Methods 0.000 description 8
- 238000002485 combustion reaction Methods 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 239000006104 solid solution Substances 0.000 description 6
- 229910003023 Mg-Al Inorganic materials 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 5
- 238000005275 alloying Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 238000009472 formulation Methods 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- 238000001035 drying Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005496 eutectics Effects 0.000 description 3
- 230000004907 flux Effects 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- 150000002910 rare earth metals Chemical class 0.000 description 3
- 230000035882 stress Effects 0.000 description 3
- 229910000905 alloy phase Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 230000008261 resistance mechanism Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910052790 beryllium Inorganic materials 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000001680 brushing effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
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- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000004512 die casting Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
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- 230000003670 easy-to-clean Effects 0.000 description 1
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- 238000003379 elimination reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005429 filling process Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 239000012770 industrial material Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
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- 229910052712 strontium Inorganic materials 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000011573 trace mineral Substances 0.000 description 1
- 235000013619 trace mineral Nutrition 0.000 description 1
Images
Classifications
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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
- C22C1/02—Making non-ferrous alloys by melting
- C22C1/03—Making non-ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D7/00—Casting ingots, e.g. from ferrous metals
- B22D7/005—Casting ingots, e.g. from ferrous metals from non-ferrous metals
-
- 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
-
- 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
Abstract
The invention discloses a preparation process of an alkaline earth heat-resistant magnesium alloy ingot, which belongs to the technical field of magnesium alloy production technology, and is characterized in that talcum powder coating, zinc oxide coating, covering agent and refining agent are prepared firstly, and then the covering agent is added in the process of smelting magnesium ingots and aluminum ingots to control the smelting stability; then, introducing Mn element into Al-10% Mn intermediate alloy, then adding zinc ingot, then wrapping Mg-30% Ca with aluminum foil, adding into alloy liquid, and then adding refining agent, thereby controlling the refining process; and after the refining is finished, pouring in a die preheated to 200 ℃, and obtaining the magnesium alloy ingot after the pouring is finished. The invention solves the technical problems of high cost and difficult process of the magnesium alloy preparation process in the prior art.
Description
Technical Field
The invention relates to the technical field of magnesium alloy production technology, in particular to a preparation process of an alkaline earth heat-resistant magnesium alloy ingot.
Background
The magnesium alloy has the advantages of low density, high specific strength and specific stiffness, high electric and thermal conductivity, excellent damping and shock absorption performance and electromagnetic shielding performance, good casting and forming performance and cutting processing performance, easy recycling and the like. Therefore, the material has wide application prospect in the fields of aerospace, automobile manufacturing, household appliance instruments, electronic communication and the like, and becomes a very important modern industrial material. The Mg-Al-based alloy has the advantages of good die casting, processing and mechanical properties, small density, high specific strength and specific stiffness and the like, so that the Mg-Al-based alloy is the most widely applied magnesium alloy system at present. In recent years, the requirements of energy conservation, environmental protection and light weight of automobiles promote the large-scale development and application of magnesium alloys in the field of automobiles, most commercial magnesium alloys are mainly Mg-Al series alloys, and a second phase in the Mg-Al series alloys is mainly a eutectic beta phase, and the relative content, shape, distribution and size of the eutectic beta phase have great influence on the strength and toughness of the alloys.
Alloying is one of the most common and effective methods for improving the mechanical properties of magnesium alloys. The alloy elements added to the Mg — Al heat-resistant magnesium alloy can be roughly classified into three types: rare earth elements, alkaline earth elements and other alloying elements. The rare earth element is used as an important alloying element in the magnesium alloy, and has the excellent characteristics of grain refinement, casting property improvement, room temperature improvement, high-temperature mechanical property improvement and the like. Based on this, chinese patent CN102618757A discloses a heat-resistant magnesium alloy, which belongs to the technical field of rare earth element magnesium alloys. The magnesium alloy consists of Mg, Al, Mn, rare earth, Nb, Zr and M elements, and the weight percentage composition of the magnesium alloy is
1.5 to 25 percent of All, 0.13 to 2 percent of Mn0.0002 to 9 percent of rare earth, 0.0002 to 1.5 percent of Nb0.001 to 1 percent of Zr, and M
0.0002-2% of element and the balance of Mg, wherein the M element is at least one of Ti, Sr, Ca, C and B. The heat-resistant magnesium alloy changes the structure of a beta phase by adding rare earth elements and Nb elements into the magnesium alloy; and Zr and M are added to refine the crystal grains, so that the high temperature resistance of the magnesium alloy is improved.
However, the commercial application of the above heat-resistant magnesium alloy is limited due to the high cost of the rare earth magnesium alloy. Specifically, the rare earth element in the magnesium alloy is replaced by the alkaline earth element Ca, so that the cost can be reduced, and the mechanical property of the magnesium alloy can be ensured. Therefore, the addition of the alkaline earth element Ca to alloy the Mg-Al series refractory material improves the comprehensive mechanical property of the existing heat-resistant magnesium alloy, and further develops a novel heat-resistant magnesium alloy containing Ca, which becomes an important market development direction, and not only can refine the microstructure of the magnesium alloy and improve the casting property of the magnesium alloy, but also can improve the mechanical property of the magnesium alloy. Therefore, the application research of Ca in the high-strength heat-resistant magnesium alloy is very important in the current market, and the comprehensive mechanical property of the alloy can be improved by starting from the flame retardant effect, the fine grain strengthening and the dispersion strengthening.
Disclosure of Invention
Therefore, it is necessary to provide a preparation process of an alkaline earth heat-resistant magnesium alloy ingot for solving the technical problems of high cost, difficult preparation process and the like of the magnesium alloy preparation process in the prior art.
A preparation process of an alkaline earth heat-resistant magnesium alloy ingot comprises the following steps:
s1: respectively preparing talcum powder coating, zinc oxide coating, covering agent and refining agent according to a preset formula, preparing smelting raw materials according to the preset formula, and pretreating a smelting tool;
s2: firstly, heating a crucible to 400-500 ℃, then uniformly covering a layer of covering agent on the inner wall and the bottom of the crucible, then respectively adding a pure magnesium ingot and a pure aluminum ingot, and covering a layer of covering agent on the surface of the added smelting raw material;
s3: continuously heating the furnace to 700 ℃, and then, preserving the heat for 25 minutes;
s4: after all the added smelting raw materials are melted, adding preheated Al-10% Mn intermediate alloy into a crucible, uniformly stirring, heating the furnace to 720 ℃, and then preserving the heat for 15 minutes;
s5: continuously adding pure zinc, and uniformly stirring;
s6: heating the furnace to 740 ℃, firstly removing impurities on the alloy liquid surface, then wrapping Mg-30% Ca with aluminum foil, adding the wrapped Mg-30% Ca into the alloy liquid, pressing the wrapped Mg-30% Ca below the alloy liquid surface, adding a refining agent, uniformly stirring, maintaining the furnace temperature at 740 ℃, and keeping the temperature for 15 minutes;
s7: maintaining the temperature of the alloy liquid at 740 ℃, then, wrapping a proper amount of refining agent with aluminum foil, putting the aluminum foil into a bell jar, immersing the bell jar into two thirds of the depth of the alloy liquid, stirring the alloy liquid on one side, continuously and uniformly scattering the refining agent on the other side, refining until white oxide does not appear on the surface of the alloy liquid, removing impurities on the surface of the alloy liquid, and finally, uniformly paving a layer of covering agent on the surface of the alloy liquid;
s8: standing for 20 minutes after refining is finished;
s9: and pouring the alloy liquid cooled to 690 ℃ in a mould preheated to 200 ℃, and obtaining the magnesium alloy ingot after pouring.
Specifically, in step S1, the talc powder, the water glass and the water are mixed in a ratio of 15: 2.5: preparing 82.5 parts by mass; then, firstly pouring water glass; then adding water at room temperature, and continuing to add the talcum powder after fully stirring; and finally, uniformly stirring the mixture to prepare the talcum powder coating.
Further, in step S1, zinc oxide, water glass, and water are mixed in a ratio of 18: 5: 77, then pouring the water glass; then, adding hot water with the temperature of 60 ℃, uniformly stirring, and then adding zinc oxide; finally, it is stirred well to prepare the zinc oxide coating.
Specifically, the covering agent comprises the following components in parts by mass: MgCl2 38~46%、KCl 32~40%、BaCl2 5~8%、CaF2 3~5%、CaCl21.5 percent, NaCl + CaCl 8 percent, MgO 1.5 percent and water 3 percent.
Further, the raw materials are prepared according to the formula of the covering agent, and CaF is removed2Putting the rest of the raw materials into a graphite crucible, heating the graphite crucible to 1023-1073K, stopping heating when the raw materials are heated to boiling, uniformly stirring the raw materials in the graphite crucible, pouring the raw materials into blocks, naturally cooling the block-shaped mixed materials to room temperature, and adding CaF weighed in advance2Mixing and grinding the raw materials into powder, and sieving the powder by using a 20-40-mesh sieve.
In particular, the refiningThe formula of the agent by mass portion is: KCl 43.5%, BaCl2 15%、CaF2 2%、CaCl228 percent of NaCl and CaCl, 8 percent of MgO, 1.5 percent of MgO and 2 percent of water.
Specifically, the smelting raw materials comprise the following components in parts by mass: 82.8-87.4% of pure magnesium ingot, 4% of pure aluminum ingot, 8-12% of pure zinc ingot, 0.05% of aluminum foil, 0.25% of Al-10% of Mn and 0.3-0.9% of Mg-30% of Ca.
Specifically, in step S2, the amount of the covering agent is 1 to 2% by mass of the charged charge.
Specifically, the magnesium alloy ingot obtained in step S9 is subjected to solution aging heat treatment at 350 ℃.
In conclusion, the preparation process of the alkaline earth heat-resistant magnesium alloy ingot improves the comprehensive performances of the magnesium alloy, such as room temperature, high temperature and the like, by utilizing low-cost alloy elements as much as possible, and the high-temperature creep resistance mechanism of the alkaline earth heat-resistant magnesium alloy ingot is mainly realized by increasing the content of zinc and controlling the input proportion of zinc and aluminum, so that heat-resistant alloy phases, such as magnesium, aluminum, zinc and the like, can be formed in the magnesium alloy, and the creep resistance of the magnesium alloy is obviously improved. In addition, the metal zinc is an alloy element which is beneficial to improving the high-temperature strength of the magnesium alloy, and the solid solubility of zinc in magnesium is higher and can reach 6.2 percent, so that the solid solution amount of zinc in the magnesium alloy can be increased by increasing the content of the zinc element, the solid solution strengthening effect of zinc can be fully exerted, and the alloy element is also beneficial to improving the high-temperature strength and the creep resistance of the magnesium alloy. In addition, the addition of calcium in the magnesium alloy can promote the refinement of the ternary heat-resistant strengthening phase and make the ternary heat-resistant strengthening phase uniformly distributed, thereby effectively improving the heat resistance and creep resistance of the magnesium alloy, particularly for the magnesium alloy with the aluminum content less than or equal to 4 percent. Therefore, the expensive rare earth elements can be replaced by adding the alkaline earth elements with low cost, and good alloy performance can be obtained. Furthermore, the invention also solves the problem of difficult process for smelting magnesium alloy in the prior art by introducing the use of a covering agent and a refining agent. Prevention of oxidation and combustion is a very important problem in the magnesium alloy melting process. Because magnesium has a great affinity with oxygen, when magnesium alloy is smelted in air, metal magnesium can be rapidly combined with oxygen to generate a loose oxide film, and the density coefficient of the oxide film is 0.7, while that of aluminum oxide is 1.28. The above-mentioned non-dense oxide film does not hinder the passage of the reaction substance, and therefore, the oxidation process can be continuously performed. In addition, the magnesium oxide generated by the reaction has good heat insulation property during oxidation, so that heat generated by a reaction interface cannot be dissipated outwards rapidly in time, the oxidation process is accelerated until oxidation combustion is carried out, and water vapor in the air can also have violent exothermic reaction with the magnesium melt. Therefore, in order to prevent oxidation and combustion in the magnesium alloy melt process, the covering agent and the refining agent are adopted to protect smelting. Therefore, the preparation process of the alkaline earth heat-resistant magnesium alloy ingot solves the technical problems of high preparation cost and difficult process of magnesium alloy in the prior art.
Drawings
FIG. 1 is a flow chart of a process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to the invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention more comprehensible, embodiments accompanying figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will recognize without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise explicitly stated or limited, the terms "mounted," "connected," "fixed," and the like are to be construed broadly, e.g., as being permanently connected, detachably connected, or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are for purposes of illustration only and do not denote a single embodiment.
Referring to fig. 1, fig. 1 is a flow chart illustrating a process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to the present invention. As shown in figure 1, the preparation process of the alkaline earth heat-resistant magnesium alloy ingot comprises the following steps:
s1: respectively preparing a talcum powder coating, a zinc oxide coating, a covering agent and a refining agent according to a preset formula, preparing smelting raw materials according to the preset formula, and pretreating a smelting tool;
s2: firstly, heating a crucible to 400-500 ℃, then uniformly covering a layer of covering agent on the inner wall and the bottom of the crucible, then respectively adding a pure magnesium ingot and a pure aluminum ingot, and covering a layer of covering agent on the surface of the added smelting raw material;
s3: continuously heating the furnace to 700 ℃, and then preserving the heat for 25 minutes;
s4: after the added smelting raw materials are completely melted, adding preheated Al-10% Mn intermediate alloy into a crucible, uniformly stirring, heating the furnace to 720 ℃, and then, preserving the heat for 15 minutes;
s5: continuously adding pure zinc, and uniformly stirring;
s6: heating the furnace to 740 ℃, firstly removing impurities on the alloy liquid surface, then wrapping Mg-30% Ca with aluminum foil, adding the wrapped Mg-30% Ca into the alloy liquid, pressing the wrapped Mg-30% Ca below the alloy liquid surface, adding a refining agent, uniformly stirring, maintaining the furnace temperature at 740 ℃, and keeping the temperature for 15 minutes;
s7: maintaining the temperature of the alloy liquid at 740 ℃, then, wrapping a proper amount of refining agent with aluminum foil, putting the aluminum foil into a bell jar, immersing the bell jar into two thirds of the depth of the alloy liquid, stirring the alloy liquid on one side, continuously and uniformly scattering the refining agent on the other side, refining until white oxide does not appear on the surface of the alloy liquid, removing impurities on the surface of the alloy liquid, and finally, uniformly paving a layer of covering agent on the surface of the alloy liquid;
s8: standing for 20 minutes after refining is finished;
s9: and pouring the alloy liquid cooled to 690 ℃ in a mould preheated to 200 ℃, and obtaining the magnesium alloy ingot after pouring.
Specifically, in the step S1, the talc powder coating includes the following components in parts by mass: 15% of talcum powder, 2.5% of water glass and 82.5% of water; the preparation method comprises pouring water glass, adding water at room temperature, stirring, adding pulvis Talci, and stirring. The talcum powder coating is mainly applied to brushing crucibles, crucible covers and other smelting tools.
Further, the zinc oxide coating comprises the following components in parts by mass: 18 percent of zinc oxide, 5 percent of water glass and 77 percent of water, and the preparation method comprises the steps of firstly pouring 5 percent of water glass, then flushing 77 percent of hot water with the temperature of 60 ℃, uniformly stirring, then adding 18 percent of zinc oxide, and finally, fully and uniformly stirring. The zinc oxide coating is mainly applied to painting of a mold, and talc powder type coatings cannot be used in the painting process of the mold so as not to influence the smoothness of the surface of the mold. Therefore, a paint of zinc oxide and water glass can be used. Because the zinc oxide has stronger high-temperature dry cracking resistance, new impurities cannot be introduced into the corresponding high-temperature magnesium alloy melt; the water glass has good viscosity, so that the water glass can keep dehydration at high temperature and does not generate decomposition; moreover, the water solution of the water glass and the water solution of the zinc oxide have good intersolubility, so that a smooth and wrinkle-free surface can be formed after the casting mold is coated. Therefore, the zinc oxide coating can protect the metal mold, adjust the cooling speed of each part of the casting in the metal mold, improve the surface quality of the casting, improve the removing condition of gas in the cavity and the like.
Specifically, the pretreatment of the smelting tool comprises operations of heating, drying, coating and the like. The reaction between water vapor and magnesium melt is violent; therefore, all raw materials, flux, smelting and casting tools are heated and dried before the magnesium alloy is smelted, so as to completely remove moisture. The tool in contact with the melt is preheated to a dark red color before use and washed sufficiently in the melt of the covering or refining agent to remove impurities from its surface. Further, before smelting, the inner wall of the die, a slag removing tool and a refining tool need to be subjected to rust removal treatment and coated with talcum powder coating; meanwhile, the furnace burden is required to be subjected to oil removal, water removal, surface oxide and other dirt treatment, and all the additives are put into a drying box at 200 ℃ for drying for later use. Further, if the crucible used is new, the covering agent should be used for at least 8 hours; if the used crucible is used after the smelting is finished, the residual magnesium liquid is poured out firstly, hot water is filled firstly after the crucible is naturally cooled to be below 100 ℃, and then the crucible is soaked for a plurality of hours, so that the residual slag in the crucible is easy to clean. Before each smelting, the crucible used needs to be ensured to be in a clean state.
Specifically, in the step S1, the formula of the covering agent in parts by mass is: MgCl2 38~46%、KCl 32~40%、BaCl2 5~8%、CaF2 3~5%、CaCl21.5 percent, NaCl + CaCl 8 percent, MgO 1.5 percent and water 3 percent. One preferred embodiment is: MgCl2 40%、KCl 36%、BaCl2 6%、CaF2 4%、CaCl2 1.5%、NaCl+CaCl28%, MgO 1.5% and water 3%. More specifically, the detailed preparation process of the covering agent comprises the following steps: preparing raw materials according to the preset component formula of the covering agent, and removing CaF2Putting the rest of the raw materials into a graphite crucible, heating the graphite crucible to 1023-1073K, stopping heating when the raw materials are heated to boiling, uniformly stirring the raw materials in the graphite crucible, pouring the raw materials into blocks, naturally cooling the block-shaped mixed materials to room temperature, and adding CaF weighed in advance2Mixing and grinding the materials into powder, and sieving the powder by using a sieve with 20-40 meshes.
Further, in the step S1, the refining agent is prepared from the following components in parts by mass: KCl 43.5%, BaCl2 15%、CaF2 2%、CaCl228 percent of NaCl and CaCl, 8 percent of MgO, 1.5 percent of MgO and 2 percent of water. The detailed preparation process of the refining agent comprises the following steps: preparing raw materials according to the preset component formula of the refining agent, and removing CaF2External onePutting the rest raw materials into a graphite crucible, heating the graphite crucible to 1023-1073K, stopping heating when the graphite crucible is heated to boiling, uniformly stirring the raw materials in the graphite crucible, pouring the raw materials into blocks, naturally cooling the block-shaped mixed materials to room temperature, and adding CaF (calcium fluoride) weighed in advance2Mixing and grinding the raw materials into powder, and sieving the powder by using a sieve with 20-40 meshes.
Further, the smelting raw materials used in the preparation process of the alkaline earth heat-resistant magnesium alloy ingot comprise the following components in parts by mass: 82.8-87.4% of pure magnesium ingot, 4% of pure aluminum ingot, 8-12% of pure zinc ingot, 0.05% of aluminum foil, 0.25% of Al-10% of Mn and 0.3-0.9% of Mg-30% of Ca. One preferred embodiment is: 83.4 percent of pure magnesium ingot, 4 percent of pure aluminum ingot, 12 percent of pure zinc ingot, 0.05 percent of aluminum foil, 0.25 percent of Al-10 percent of Mn and 0.3 percent of Mg-30 percent of Ca. Specifically, the purity of the pure magnesium ingot, the pure aluminum ingot and the pure zinc ingot is not lower than 99.5%. In addition, trace elements Be, Mn and Ca are added in the form of aluminum foil, Al-10% Mn master alloy and Mg-30% Ca master alloy, respectively.
Specifically, in the step S1, when the crucible is heated to 400 to 500 ℃, the surface of the crucible is dark red; at the moment, a layer of covering agent is required to be uniformly scattered on the bottom and the inner wall of the crucible in time, and then pure magnesium ingots and pure aluminum ingots are respectively added; moreover, a layer of covering agent is uniformly scattered on the material surface of the added pure magnesium ingot and the pure aluminum ingot. At this time, the amount of the covering agent added is 1-2% of the mass of the added pure magnesium ingot and the pure aluminum ingot.
Further, in step S5, since pure zinc ingot is chemically active, when it is found that pure zinc ingot is exposed to the outside of the alloy liquid and burned during charging or melting after adding pure zinc, it is necessary to promptly replenish the covering agent and extinguish it.
Further, in step S7, when the temperature of the magnesium alloy liquid at this time is adjusted to 740 ℃, refining may be started. Specifically, the added refining agent needs to be wrapped with aluminum foil and then put into a bell jar together with the aluminum foil. When the bell jar is immersed in the depth of two thirds of the magnesium alloy liquid, strong circulating convection of the magnesium alloy liquid in the vertical direction needs to be generated by stirring, and meanwhile, a refining agent needs to be continuously scattered on the surface of the magnesium alloy liquid. In this case, it is necessary to take care that the refining agent is mainly sprinkled on the magnesium bath from the lower part to the surface, so that the entire surface of the bath is covered with a layer of refining agent. Then, the refining was continued until the surface of the molten magnesium was no longer turned up by white oxides from the lower portion of the molten pool and the surface of the alloy liquid was a bright mirror surface. Finally, after impurities such as flux or slag on the crucible wall and the surface of the molten alloy are removed, a new layer of covering agent is sprayed on the crucible wall and the surface of the molten alloy. In the re-refining process, the used refining agent accounts for 1.5-2.5% of the total mass of all the charged furnace charges.
Further, in the above step S9, the casting mold may be preheated using a resistance furnace. Specifically, when the temperature of the magnesium alloy liquid is naturally cooled to about 690 ℃, taking out the die preheated to 200 ℃ from the resistance furnace; firstly, removing a flux on the surface of the magnesium alloy liquid, and simultaneously enabling a pouring gate to be close to a mold as much as possible; and the opportunity that the surface of the magnesium liquid is contacted with the atmosphere is reduced as much as possible in the casting process, and the sulphur bloom can be properly withdrawn to the magnesium liquid in the casting process if necessary so as to establish a protective atmosphere around the casting mould. The above-mentioned thioflavin is S: H3BO =1: 1. During pouring, the magnesium alloy liquid flows stably under stress so as to reduce eddy and splash as much as possible. More specifically, it is necessary to control the slow tilting of the crucible just before the start of casting to prevent the occurrence of turbulence and fluctuation in the crucible level. After the liquid level and the flowing speed are stable, accelerated pouring is needed to ensure that the liquid is quickly filled. And after the pouring is finished, pouring the residual magnesium alloy liquid out of the crucible, and removing the residual slag. In particular, the preheating of the casting mold to 200 ℃ in advance is intended to prevent its solidification and clogging in the runners during the liquid filling process. The reason why the temperature of the magnesium alloy liquid is reduced to 680 ℃ before casting is that if the casting temperature is too high, the oxidation combustion of the magnesium alloy in the casting process can be accelerated.
Further, after step S9, the heat treatment may be continued on the prepared magnesium alloy ingot to further enhance the material properties of the magnesium alloy ingot. The most important process of the conventional heat treatment of magnesium alloy is the solution aging. Whether magnesium alloys can be heat treated depends entirely on whether the solubility of the alloying elements in the alloy matrix changes with temperature. When the solubility of the added solute alloy elements in the magnesium alloy is obviously changed along with the temperature, the alloy is optimally strengthened by adopting the solution treatment. In the preparation process of the alkaline earth heat-resistant magnesium alloy ingot, the temperature of the solid solution aging treatment is 350 ℃. The upper limit of the temperature of the solution treatment is the solidus temperature of the alloy, and if the solution treatment temperature is too high, an overburnt structure is likely to be generated, and the structure of the magnesium alloy after the treatment is coarse, so that the performance is rapidly reduced. To prevent over-firing, the solution treatment temperature must be below the eutectic temperature, or must be below the temperature at which the alloy constituents have maximum solubility. When the solid solution temperature is too low, the homogenization time is required
Prolonged, energy-wasting, long process cycle, and not good elimination of compositional and tissue inhomogeneities.
Further, the magnesium alloy ingot sample prepared by the alkaline earth heat-resistant magnesium alloy ingot preparation process is continuously subjected to high-temperature mechanical property test, specifically, before the high-temperature sample is stretched, the temperature of an environment box of an electronic universal testing machine with the environment box is raised to 150 ℃, then the environment box is kept for 10 minutes, and after the temperature in the environment box is stable and the heat is uniform, the sample is loaded to test the high-temperature mechanical property of the sample. Stress and strain signals are respectively obtained by a stress sensor and a displacement sensor of the electronic universal tester, a stress-strain curve is generated by a computer and software matched with the computer, and then the yield strength and the tensile strength of a corresponding sample are calculated. The elongation of the specimen was calculated by measuring the length of the specimen before and after the fracture. In the test process, the stretching speed is controlled to be 0.5mm/min, and the result is the average value of three samples. And before stretching, the sample is polished to be bright by a file and abrasive paper so as to remove surface defects such as flash, burr and the like generated in the casting process. The formulation for sample 1 was: 83.4 percent of pure magnesium ingot, 4 percent of pure aluminum ingot, 12 percent of pure zinc ingot, 0.05 percent of aluminum foil and 0.25 percent of Al-10 percent of Mn; the formulation of test 2 was: 83.4 percent of pure magnesium ingot, 4 percent of pure aluminum ingot, 12 percent of pure zinc ingot, 0.05 percent of aluminum foil, 0.25 percent of Al-10 percent of Mn and 0.3 percent of Mg-30 percent of Ca; the formulation for sample 3 was: 83.4 percent of pure magnesium ingot, 4 percent of pure aluminum ingot, 12 percent of pure zinc ingot, 0.05 percent of aluminum foil, 0.25 percent of Al-10 percent of Mn and 0.6 percent of Mg-30 percent of Ca; the formulation for sample 4 was: 83.4 percent of pure magnesium ingot, 4 percent of pure aluminum ingot, 12 percent of pure zinc ingot, 0.05 percent of aluminum foil, 0.25 percent of Al-10 percent of Mn and 0.9 percent of Mg-30 percent of Ca. From the test results, it can be seen that the tensile strength and yield strength of the test alloy both increased and then decreased as the calcium content increased. As for the tensile strength, the maximum value of the tensile strength of the sample at a calcium content of 0.3% was obtained, that is, the maximum value of the tensile strength of the sample 2 was 203MPa, whereas the tensile strength of the sample 1 was only 129MPa, the tensile strength of the sample 3 was 175MPa, and the tensile strength of the sample 4 was 159 MPa. For yield strength, sample 3 reached a maximum of 151MPa at 0.6% calcium, the remaining three groups were 126MPa, 145MPa and 149MPa, respectively; and then as the tensile strength decreases, the yield strength also decreases. The elongation of the four groups of samples was: 3.2%, 17.3%, 5.6% and 5.5%, that is, the elongation of sample 2 is the most preferable, and increasing the calcium content in the magnesium alloy is advantageous for increasing the total elongation. Therefore, the addition of a proper amount of alkaline earth elements in the preparation of the magnesium alloy is beneficial to improving the heat resistance of the magnesium alloy.
In conclusion, the preparation process of the alkaline earth heat-resistant magnesium alloy ingot improves the comprehensive properties of the magnesium alloy, such as room temperature, high temperature and the like, by utilizing low-cost alloy elements as much as possible, and the high-temperature creep resistance mechanism of the alkaline earth heat-resistant magnesium alloy ingot is mainly realized by increasing the content of zinc and controlling the input proportion of zinc and aluminum, so that heat-resistant alloy phases, such as magnesium, aluminum, zinc and the like, can be formed in the magnesium alloy, and the creep resistance of the magnesium alloy is obviously improved. In addition, the metal zinc is an alloy element which is beneficial to improving the high-temperature strength of the magnesium alloy, and the solid solubility of zinc in magnesium is higher and can reach 6.2 percent, so that the solid solution amount of zinc in the magnesium alloy can be increased by increasing the content of the zinc element, the solid solution strengthening effect of zinc can be fully exerted, and the alloy element is also beneficial to improving the high-temperature strength and the creep resistance of the magnesium alloy. In addition, the addition of calcium in the magnesium alloy can promote the refinement of the ternary heat-resistant strengthening phase and make the ternary heat-resistant strengthening phase uniformly distributed, thereby effectively improving the heat resistance and creep resistance of the magnesium alloy, particularly for the magnesium alloy with the aluminum content of less than or equal to 4 percent. Therefore, the expensive rare earth elements can be replaced by adding the alkaline earth elements with low cost, and good alloy performance can be obtained. Furthermore, the invention also solves the problem of difficult process for smelting magnesium alloy in the prior art by introducing the use of a covering agent and a refining agent. Prevention of oxidation and combustion is a very important problem in the magnesium alloy melting process. Because magnesium has a high affinity with oxygen, when magnesium alloy is smelted in air, metal magnesium can be rapidly combined with oxygen to generate a loose oxide film, and the compactness coefficient of the oxide film is 0.7, while that of aluminum oxide is 1.28. The above-mentioned non-dense oxide film does not hinder the passage of the reaction substance, and therefore, the oxidation process can be continuously performed. In addition, the magnesium oxide generated by the reaction has good heat insulation property during oxidation, so that heat generated by a reaction interface cannot be dissipated outwards rapidly in time, the oxidation process is accelerated until oxidation combustion is carried out, and water vapor in the air can also have violent exothermic reaction with the magnesium melt. Therefore, in order to prevent oxidation and combustion in the magnesium alloy melt process, the covering agent and the refining agent are adopted to protect smelting. Therefore, the preparation process of the alkaline earth heat-resistant magnesium alloy ingot solves the technical problems of high preparation cost and difficult process of magnesium alloy in the prior art.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. The preparation process of the alkaline earth heat-resistant magnesium alloy ingot is characterized by comprising the following steps of:
s1: respectively preparing talcum powder coating, zinc oxide coating, covering agent and refining agent according to a preset formula, preparing smelting raw materials according to the preset formula, and pretreating a smelting tool;
s2: firstly, heating a crucible to 400-500 ℃, then uniformly covering a layer of covering agent on the inner wall and the bottom of the crucible, then respectively adding a pure magnesium ingot and a pure aluminum ingot, and covering a layer of covering agent on the surface of the added smelting raw material;
s3: continuously heating the furnace to 700 ℃, and then, preserving the heat for 25 minutes;
s4: after the added smelting raw materials are completely melted, adding preheated Al-10% Mn intermediate alloy into a crucible, uniformly stirring, heating the furnace to 720 ℃, and then, preserving the heat for 15 minutes;
s5: continuously adding pure zinc, and uniformly stirring;
s6: heating the furnace temperature to 740 ℃, firstly removing impurities on the alloy liquid level, then wrapping Mg-30% Ca with aluminum foil, adding the wrapped Mg-30% Ca into the alloy liquid, pressing the wrapped Mg-30% Ca below the alloy liquid level, adding a refining agent, stirring uniformly, maintaining the furnace temperature at 740 ℃, and preserving the temperature for 15 minutes;
s7: maintaining the temperature of the alloy liquid at 740 ℃, then, wrapping a proper amount of refining agent with aluminum foil, putting the aluminum foil into a bell jar, immersing the bell jar into two thirds of the depth of the alloy liquid, stirring the alloy liquid on one side, continuously and uniformly scattering the refining agent on the other side, refining until white oxide does not appear on the surface of the alloy liquid, removing impurities on the surface of the alloy liquid, and finally, uniformly paving a layer of covering agent on the surface of the alloy liquid;
s8: standing for 20 minutes after refining is finished;
s9: and pouring the alloy liquid cooled to 690 ℃ in a mould preheated to 200 ℃, and obtaining the magnesium alloy ingot after pouring.
2. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 1, wherein: in step S1, talc, water glass, and water are mixed in a ratio of 15: 2.5: preparing 82.5 parts by mass; then, firstly pouring water glass; then adding water at room temperature, and continuing to add the talcum powder after fully stirring; and finally, uniformly stirring the mixture to prepare the talcum powder coating.
3. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 2, wherein: in step S1, zinc oxide, water glass, and water are mixed in a ratio of 18: 5: 77, then pouring the water glass; then, adding hot water with the temperature of 60 ℃, uniformly stirring, and then adding zinc oxide; and finally, fully and uniformly stirring the mixture to prepare the zinc oxide coating.
4. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 1, wherein: the formula of the covering agent in parts by mass is as follows: MgCl2 38~46%、KCl 32~40%、BaCl2 5~8%、CaF2 3~5%、CaCl21.5 percent, NaCl + CaCl 8 percent, MgO 1.5 percent and water 3 percent.
5. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 4, wherein: preparing raw materials according to the formula of the covering agent, and removing CaF2Putting the rest of the raw materials into a graphite crucible, heating the graphite crucible to 1023-1073K, stopping heating when the raw materials are heated to boiling, uniformly stirring the raw materials in the graphite crucible, pouring the raw materials into blocks, naturally cooling the block-shaped mixed materials to room temperature, and adding CaF weighed in advance2Mixing and grinding the raw materials into powder, and sieving the powder by using a 20-40-mesh sieve.
6. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 1, wherein: the refining agent comprises the following components in parts by mass: KCl 43.5%, BaCl2 15%、CaF2 2%、CaCl228 percent of NaCl and CaCl, 8 percent of MgO, 1.5 percent of MgO and 2 percent of water.
7. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 1, wherein: the smelting raw materials comprise the following components in parts by mass: 82.8-87.4% of pure magnesium ingot, 4% of pure aluminum ingot, 8-12% of pure zinc ingot, 0.05% of aluminum foil, 0.25% of Al-10% of Mn and 0.3-0.9% of Mg-30% of Ca.
8. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 1, wherein: in step S2, the amount of the covering agent is 1-2% by mass of the charged charge.
9. The process for preparing an alkaline earth heat-resistant magnesium alloy ingot according to claim 8, wherein: and (5) continuing to perform solution aging heat treatment on the magnesium alloy ingot obtained in the step S9, wherein the treatment temperature is 350 ℃.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104901A (en) * | 2007-08-14 | 2008-01-16 | 太原理工大学 | Flame-proof magnesium alloy added with beryllium and strontium and preparation method thereof |
| CN101857934A (en) * | 2010-06-23 | 2010-10-13 | 周天承 | Heat-resistant magnesium alloy and preparation method thereof |
| JP2011099136A (en) * | 2009-11-04 | 2011-05-19 | Ahresty Corp | Heat-resistant magnesium alloy and method for manufacturing alloy casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101104901A (en) * | 2007-08-14 | 2008-01-16 | 太原理工大学 | Flame-proof magnesium alloy added with beryllium and strontium and preparation method thereof |
| JP2011099136A (en) * | 2009-11-04 | 2011-05-19 | Ahresty Corp | Heat-resistant magnesium alloy and method for manufacturing alloy casting |
| CN101857934A (en) * | 2010-06-23 | 2010-10-13 | 周天承 | Heat-resistant magnesium alloy and preparation method thereof |
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