A preparation method of a high-strength and corrosion-resistant aluminum-lithium alloy profile

Abstract

The present application discloses a preparation method of a high-strength and corrosion-resistant aluminum-lithium alloy profile, belonging to the field of metal materials engineering. The method includes Step 1: melting metal raw materials into a metal melt; Step 2: casting and molding the metal melt into a forging. In Step 1, the following equipment is used for metal melting. The equipment includes an external structure, an internal structure, a feeding and storage container, and a storage container. The melting chamber housing serves as a positioning foundation. The feeding channel vacuum tube is fixedly connected to the melting housing through a cube box body. The blanking channel is a vertically arranged cylindrical tube, and the bottom end of the blanking channel is parallel to the bottom end of the upper frame of the melting chamber housing and is fixedly connected to the melting chamber housing. The storage container is an aluminum can, and metal lithium is encapsulated inside. This method uses an aluminum can to encapsulate metal lithium, making the dissolution of lithium in aluminum more uniform.

Description

Technical Field

[0001] The present invention belongs to the field of metal materials engineering, and particularly relates to a preparation method of a new type of aluminum-lithium alloy Background Art

[0002] Aluminum-lithium alloys have the advantages of low density, high strength, good corrosion resistance and easy processing, and are widely used in industries such as aerospace, transportation, and electronic power. As the lightest metal in the world, lithium can form a solid solution with aluminum

[0003] The preparation of aluminum-lithium alloys mainly relies on the method of melting and casting. However, due to the low density, low melting point, high activity and certain toxicity of lithium, it causes certain difficulties in the casting of aluminum-lithium alloys. Therefore, aluminum-lithium alloys will react with oxygen, carbon dioxide, water vapor and nitrogen in the air in the molten state. Therefore, the melting of aluminum-lithium alloys is generally carried out under a protective gas atmosphere or with a molten salt covering the surface of the melt containing lithium, or directly in a vacuum environment. In addition, due to the relatively large density difference between lithium and aluminum, obtaining a uniform dispersion of lithium during the casting process is also a key issue

[0004] Powder metallurgy is a new technology developed in recent years for directly preparing alloys or composite materials using metal powders, and has been widely used in fields such as transportation, machinery, electronics, aerospace, weapons, biology, and new energy, becoming one of the most dynamic branches in new materials science. Powder metallurgy technology has the advantages of significant energy saving, material saving, excellent performance, high product precision and good stability. However, due to the high activity of lithium and the lack of industrial lithium powder available, the present invention therefore uses lithium pellets for treatment Summary of the Invention

[0005] The embodiments of the present application provide a preparation method of a high-strength and corrosion-resistant aluminum-lithium alloy profile; solving the problem in the prior art that the density difference between aluminum and lithium is relatively large, resulting in uneven melting of lithium during the casting process, and achieving the effect of uniform melting of lithium in the molten liquid

[0006] The present application provides a preparation method of a high-strength and corrosion-resistant aluminum-lithium alloy profile, including Step 1: melting metal raw materials into a metal melt; Step 2: casting the metal melt into a forged part

[0007] In the above Step 1, the following equipment is used for metal melting

[0008] The equipment includes an external structure, an internal structure, a feeding and storage container, and a storage container

[0009] The melting chamber housing serves as a positioning basis

[0010] The feeding channel vacuum tube is fixedly connected to the melting housing through a cube box

[0011] The blanking channel is a vertical cylindrical pipe. The bottom end of the blanking channel is parallel to the bottom end of the upper frame of the smelting chamber housing and is fixedly connected to the smelting chamber housing.

[0012] The chute chamber is a cuboid channel, and the chute chamber is fixedly connected to the bottom position of the left frame of the smelting chamber housing.

[0013] The evacuation pipe of the smelting chamber is a cylindrical pipe located at the upper part of the front frame of the smelting chamber housing and is fixedly connected to the smelting chamber housing.

[0014] The inner cavity of the smelting chamber housing includes a movable connection assembly, a telescopic rod, a smelting furnace, and molten liquid.

[0015] The smelting furnace is a cylindrical cavity with an opening at the upper end, which is used to store molten liquid and conduct smelting.

[0016] One end of the telescopic rod is fixedly connected to the smelting furnace, and the other end is fixedly connected to the upper surface of the bottom surface of the inner cavity of the smelting chamber housing.

[0017] The buffer area is a convex platform at the bottom end of the blanking channel, which is used to hold and place the storage container for casting so that it can be static at the channel.

[0018] The storage container is an aluminum can, which encapsulates metallic lithium inside.

[0019] Furthermore, the storage container is a cylindrical can, with an inert gas inside. The inert gas accounts for 1 / 5 - 1 / 4 of the volume of the can, and one end face of the can has a cross-shaped notch.

[0020] Furthermore, the thickness of the storage container is different, and after blanking, the storage container melts at different longitudinal positions in the molten metal liquid.

[0021] Furthermore, the storage container is a capsule body that is thick in the middle and flat at both ends, with a cavity inside. The cavity has an inner capsule body with the same shape as the outer capsule body; the inner capsule body is used to store lithium. The outer shape of the capsule body is an aluminum metal packaging container that is thick in the middle and flat at both ends. The capsule body includes an outer capsule and an inner capsule, and the outer capsule is made of aluminum metal as the outer shell.

[0022] Furthermore, the storage container is compacted with metallic lithium into one body, and there is no gas in the cavity.

[0023] Furthermore, an inert gas is retained in the inner capsule body, and the size of the storage container is reduced to a maximum length not greater than 5 cm.

[0024] The beneficial effects of the embodiments of the present application are as follows:

[0025] 1) By encapsulating lithium particles in a container, long-term storage is achieved.

[0026] 2) By adopting the delivery method of crack rupture, the volatilization of lithium particles can be reduced, the possibility of reaction with other substances in the air can be decreased, and the loss of lithium can be minimized.

[0027] 3) Through the structure of the storage container, by increasing the thickness of the outer capsule, the reaction time between the aluminum of the outer capsule and the molten liquid can be controlled, enabling it to sink to different positions, and thus the molten liquid can be evenly distributed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the preparation device of the present invention;

[0029] Figure 2 It is a cross-sectional view of the overall internal structure of the preparation device of the present invention;

[0030] Figure 3 It is a schematic diagram of the overall external structure of the delivery and storage container of the present invention;

[0031] Figure 4 It is a cross-sectional view of the overall internal structure of the delivery and storage container of the present invention;

[0032] Figure 5 It is a top internal cross-sectional view of the storage container of the present invention;

[0033] In the figure: external structure 100, blanking channel 110, feeding channel extraction vacuum tube 120, smelting chamber extraction vacuum tube 121, smelting chamber housing 130, flow channel chamber 140;

[0034] Internal structure 200, delivery and storage container 210, buffer zone 211, movable connection assembly 220, telescopic rod 230, smelting furnace 240, molten liquid 250;

[0035] Fracture mark 310;

[0036] Storage container 400, outer capsule body 410, inner capsule body 411, lithium particles 420. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To facilitate the understanding of the present invention, the present application will be described more comprehensively with reference to the relevant drawings; the preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein; on the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0038] It should be noted that the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this invention belongs; the terms used in the description of the present invention herein are for the purpose of describing specific embodiments only and are not intended to limit the present invention; the term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0040] A high-strength corrosion-resistant aluminum-lithium alloy of the present application includes an external structure 100, an internal structure 200, a feeding and storage container 300, and a storage container 400.

[0041] The melting chamber housing 130 serves as a positioning basis;

[0042] The feeding channel vacuum tube 120 is fixedly connected to the melting housing 130 through a cube box body;

[0043] The blanking channel 110 is a cylindrical tube arranged vertically, and the bottom end of the blanking channel 110 is parallel to the bottom end of the upper frame of the melting chamber housing 130 and is fixedly connected to the melting chamber housing 130;

[0044] The runner chamber 140 is a cuboid channel, and the runner chamber 140 is fixedly communicated with the bottom position of the left side frame of the melting chamber housing 130;

[0045] The melting chamber evacuation vacuum tube 121 is a cylindrical pipe located at the upper part of the front frame of the melting chamber housing 130 and is fixedly communicated with the melting chamber housing 130;

[0046] The internal cavity of the melting chamber housing 130 includes a movable connection assembly 220, a telescopic rod 230, a melting furnace 240, and a molten liquid 250;

[0047] The melting furnace 240 is a cylindrical cavity with an opening at the upper end for storing the molten liquid 250 and melting;

[0048] One end of the telescopic rod 230 is fixedly connected to the melting furnace 240, and the other end is fixedly connected to the upper surface of the bottom surface of the internal cavity of the melting chamber housing 130;

[0049] The buffer area 211 is a convex platform at the bottom end position of the blanking channel 110 for clamping and placing the feeding and storage container 210 to make it stand still at the channel;

[0050] The present invention also provides a method for preparing a high-strength and corrosion-resistant aluminum-lithium alloy, which includes the following steps: In the prior art, aluminum, silver, copper source, chromium source, manganese source and titanium source are sequentially added into a vacuum melting furnace and melted at 775 °C. After complete melting, degassing treatment is carried out, then magnesium and lithium are added, and after complete melting, degassing treatment is carried out again to obtain a molten alloy; Since lithium has low density, low melting point, high activity and certain toxicity, it causes certain difficulties in the casting of aluminum-lithium alloy. To solve the above problems, lithium particles are sealed in a container to reduce the loss of lithium; Therefore, a feeding storage container 210 is added. A rupture notch 310 is opened at the bottom of the feeding storage container 210, such as the cylindrical metal shown in the figure. There is an inert gas in the cavity of the feeding storage container 210; The inert gas is used to protect lithium from being contaminated. At the same time, when the feeding storage container 210 slides through the feeding channel 110 to the buffer area and remains static at the position.

[0051] The feeding channel vacuum tube 120 is connected to a vacuum pumping device, which is used to change the air pressure around the feeding storage container 210; The rupture notch 310 is a cross-notch groove. When the air pressure in the feeding storage container 210 is higher than the air pressure value around; The inert gas in the cavity of the feeding storage container 210 will break the rupture notch 310 at the bottom of the feeding storage container 210, and then discharge the lithium particles in the feeding storage container 210.

[0052] Embodiment 2

[0053] During actual use, when spraying powder from the container, splashing may occur, which may contaminate the equipment; The structure of the storage container is further improved.

[0054] The storage container 400 is a capsule body with a thick middle and flat ends, and a cavity is opened inside. The cavity has an inner capsule body 411 with the same shape as the outer capsule body 410; The inner capsule body 411 is used to store lithium. The outer shape of the capsule body is an aluminum metal encapsulation container with a thick middle and flat ends. The capsule body includes an outer capsule and an inner capsule. The outer capsule is made of aluminum metal as the outer shell. By increasing the thickness of the outer capsule, the reaction time of the aluminum in the outer capsule with the molten liquid can be controlled, so that it sinks to different positions, and then the molten liquid can be evenly distributed. Since there is actually air in the inner capsule of the capsule body, splashing will occur when it enters the molten liquid. Therefore, by squeezing the outside of the storage container 400, the gas in the inner capsule body 411 is discharged to reduce the occurrence of splashing.

[0055] Embodiment 3

[0056] In actual melting, the feed is usually in the form of blocks, particles or powders. After the materials are added to the molten metal, it is impossible to control their falling positions. Only by stirring the materials as a whole can the uniformity be improved.

[0057] Therefore, on the basis of the second embodiment, by retaining different volumes of inert gas in the inner capsule body 411, the storage container floats at different positions in the molten metal. In addition, the size of the storage container 400 is reduced to a maximum length not greater than 5 cm. In this way, during the casting process, there will be a substantially uniform distribution of materials in the molten metal, and then stirring is carried out, making it easier to achieve a uniform overall alloy ratio.

Claims

1. A preparation method of a high-strength and corrosion-resistant aluminum-lithium alloy profile, including Step 1: melting metal raw materials into a metal melt; Step 2. Pour the molten metal into a mold to form a forging, characterized in that, In the said Step 1, the following equipment is used for metal melting; The equipment includes an external structure, an internal structure, a feeding storage container, and a storage container; The smelting chamber housing serves as a positioning basis; The feeding channel vacuum tube is fixedly connected to the smelting chamber housing through a cube box body; The discharging channel is a vertically arranged cylindrical tube, and the bottom end of the discharging channel is parallel to the bottom end of the upper frame of the smelting chamber housing and is fixedly connected to the smelting chamber housing; The launder chamber is a cuboid channel, and the launder chamber is fixedly connected to the bottom position of the left side frame of the smelting chamber housing; The smelting chamber evacuation tube is a cylindrical pipe located at the upper part of the front frame of the smelting chamber housing and is fixedly connected to the smelting chamber housing; The internal cavity of the smelting chamber housing includes a movable connection assembly, a telescopic rod, a smelting furnace, and a molten liquid; The smelting furnace is a cylindrical cavity with an opening at the upper end, used for storing molten liquid and smelting; One end of the telescopic rod is fixedly connected to the smelting furnace, and the other end is fixedly connected to the upper surface of the bottom surface of the internal cavity of the smelting chamber housing; The buffer zone is a convex platform located at the bottom end of the discharging channel, used for clamping and placing the feeding storage container to make it static at the channel; The storage container is an aluminum can, internally encapsulating metallic lithium; The storage container is a cylindrical can, with an inert gas inside the can, the inert gas accounting for 1 / 5 - 1 / 4 of the volume of the can, and one end face of the can has a cross-shaped indentation; The thickness of the storage container is different, and after feeding, the storage container melts at different longitudinal positions in the molten metal liquid.

2. The preparation method of the high-strength and corrosion-resistant aluminum-lithium alloy profile according to claim 1, wherein The storage container is a capsule body thick in the middle and flat at both ends, with an internal cavity, and an inner capsule body with the same shape as the outer capsule body; the inner capsule body is used for storing lithium, and the outer shape of the capsule body is an aluminum metal encapsulation container thick in the middle and flat at both ends, and the capsule body includes an outer capsule and an inner capsule, and the outer capsule is made of aluminum metal as the outer shell.

3. The preparation method of the high-strength and corrosion-resistant aluminum-lithium alloy profile according to claim 1 or 2, characterized in that The storage container is compacted with metallic lithium into one body, and there is no gas in the cavity.

4. The preparation method of the high-strength and corrosion-resistant aluminum-lithium alloy profile according to claim 1 or 2, characterized in that, An inert gas is reserved in the inner capsule body, and the size of the storage container is reduced to a maximum length not exceeding 5 cm.

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