Magnesium-aluminum alloy and preparation method thereof

Abstract

The invention discloses a magnesium-aluminum alloy and a preparation method thereof. The magnesium-aluminum alloy comprises the following elements in percentage by weight: magnesium, aluminum, titanium, manganese, chromium, zinc, strontium, silicon and copper. The preparation method comprises the following steps: S1, putting a mixture of the components into smelting equipment, raising the temperature to 600-700 DEG C at the temperature raising speed of 50-60 DEG C / min, introducing argon into the smelting equipment at the same time, and melting for 8-10 hours; s2, oxide miscellaneous slag floating on the surface of the solution is cleared away through a scum clearing device, and a molten material is obtained; s3, a release agent is sprayed on the surface of a grinding tool of a die casting machine, and the molten material is injected into the grinding tool of the die casting machine to be punched and solidified; s4, after punching is completed, pressure maintaining is conducted for 7-10 minutes, the mold is opened, meanwhile, the spraying device is cooled, and cooling liquid for cooling the magnesium-aluminum alloy in the mold is sprayed to conduct cooling treatment on the magnesium-aluminum alloy in the mold; and S5, the magnesium-aluminum alloy piece sample is taken out for annealing and cooling, oxide miscellaneous slag on the sieve plate is taken out, impurities generated by smelting liquid can be fished out, and the purity of the raw materials is improved.

Description

Technical Field

[0001] This invention relates to the field of magnesium-aluminum alloy production technology, and in particular to a magnesium-aluminum alloy and its preparation method. Background Technology

[0002] Magnesium alloys are alloys composed of magnesium as a base and other elements. Their characteristics include: low density, high specific strength, high specific modulus of elasticity, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloys, and good resistance to corrosion from organic matter and alkalis. The main alloying elements in magnesium alloys are aluminum, zinc, manganese, cerium, thorium, and small amounts of zirconium or cadmium. Currently, magnesium-aluminum alloys are the most widely used, mainly in aerospace, transportation, chemical, and rocket industries. Magnesium is the lightest of the practical metals; its specific gravity is approximately 2 / 3 that of aluminum and 1 / 4 that of iron. It is the lightest of the practical metals, possessing high strength and high rigidity. However, existing magnesium-aluminum alloys, when smelted and processed, produce oxide slag that cannot be completely cleaned; current technology uses manual removal methods. Summary of the Invention

[0003] To address the technical problems existing in the background art, this invention proposes a magnesium-aluminum alloy and its preparation method.

[0004] This invention proposes a magnesium-aluminum alloy and its preparation method. The weight percentage of each element in the magnesium-aluminum casting alloy is as follows: magnesium 65%-68%, aluminum 3%-8%, titanium 0.8%-1.0%, manganese 0.1%-0.8%, chromium 3%-6%, zinc 0.2%-0.4%, strontium 0.5%-1.2%, silicon 0.5%-1.2%, and copper 0.1%-0.8%.

[0005] S1. Place the mixture of the above components into a melting equipment and heat it to 600-700°C at a heating rate of 50-60°C / min, while introducing argon gas into the melting equipment and melting for 8-10 hours.

[0006] S2. Remove the oxide residues floating on the surface of the solution using a scum removal device to obtain the molten material;

[0007] S3. Spray a release agent onto the surface of the die-casting machine mold, and then inject the molten material into the die-casting machine mold to form and solidify it.

[0008] S4. After the punching is completed, hold the pressure for 7-10 minutes, open the mold, and at the same time, use the cooling spray device to spray the cooled liquid to cool the magnesium-aluminum alloy in the mold.

[0009] S5. Remove the magnesium-aluminum alloy sample and anneal and cool it.

[0010] Preferably, the slag cleaning device includes two sets of fixed frames, two sets of winding rollers and a screen plate. The two sets of fixed frames are respectively located on the upper sides of the smelting equipment, and the two sets of winding rollers are respectively located below the two sets of fixed frames. Each set of fixed frames is equipped with a set of fixed pulleys.

[0011] Both sides of the screen plate are fixedly connected to the top of the lifting frame. The top of the two sets of lifting frames are horizontally installed with a horizontal plate. The two sets of horizontal plates are connected with steel cables. The two sets of steel cables are fixedly connected to the side wall of the take-up roller on the same side through a fixed pulley group on the same side. The two sets of take-up rollers are driven to rotate by a drive component. The steel cables are wound around the side wall of the take-up roller.

[0012] Preferably, a telescopic rod is installed at the bottom of both sets of fixing frames, the two sets of telescopic rods are arranged opposite to each other, and a locking block is fixedly connected to the top of each set of telescopic rods.

[0013] Preferably, the smelting equipment is cylindrical, the sieve plate is circular, and there is a gap between the outer wall of the sieve plate and the inner wall of the smelting equipment.

[0014] Preferably, the purity of each powder in the elemental powder filler is not less than 99%, and the powder is ground in a ball mill at a rate of 700 rpm for 1 to 3 hours.

[0015] Preferably, the annealing temperature is between 320 and 350°C.

[0016] This invention proposes a magnesium-aluminum alloy and its preparation method. During the smelting process, oxide slag is generated in the smelting equipment and floats on the surface of the molten metal. At this time, the winding roller rotates, the steel cable is wound up, and the screen plate is lifted upward through the fixed pulley. The screen plate picks out the oxide slag. When the screen plate rises to a certain height, the screen plate is detached from the smelting equipment. The telescopic rods of the two sets of fixed frames push out and support the horizontal plate of the screen plate lifting frame through two sets of clamps, so as to remove the oxide slag on the screen plate. This method can remove impurities generated by the molten metal, improve the purity of the raw materials, and produce magnesium-aluminum alloys with higher hardness and stronger tensile strength.

[0017] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the structure when the sieve plate is lifted according to the present invention;

[0020] Figure 3 This is a partial structural diagram of the present invention.

[0021] The following are the labels in the diagram: 1. Screen plate; 2. Fixed frame; 3. Telescopic rod; 4. Clamping block; 5. Fixed pulley block; 6. Rewinding roller; 7. Steel cable; 8. Lifting frame; 9. Horizontal plate. Detailed Implementation

[0022] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0023] Example 1:

[0024] like Figures 1-3 The invention relates to a magnesium-aluminum alloy and its preparation method. The weight percentage of each element in the magnesium-aluminum casting alloy is as follows: magnesium 65%, aluminum 3%, titanium 0.8%, manganese 0.1%, chromium 3%, zinc 0.2%, strontium 0.5%, silicon 0.5%, and copper 0.1%.

[0025] S1. Place the mixture of the above components into a melting equipment and heat it to 600-700°C at a heating rate of 50-60°C / min, while introducing argon gas into the melting equipment and melting for 8-10 hours.

[0026] S2. Remove the oxide residues floating on the surface of the solution using a scum removal device to obtain the molten material;

[0027] S3. Spray a release agent onto the surface of the die-casting machine mold, and then inject the molten material into the die-casting machine mold to form and solidify it.

[0028] S4. After the punching is completed, hold the pressure for 7-10 minutes, open the mold, and at the same time, use the cooling spray device to spray the cooled liquid to cool the magnesium-aluminum alloy in the mold.

[0029] S5. Remove the magnesium-aluminum alloy sample and anneal and cool it.

[0030] Example 2:

[0031] like Figures 1-3 The invention relates to a magnesium-aluminum alloy and its preparation method. The weight percentage of each element in the magnesium-aluminum casting alloy is as follows: magnesium 66%, aluminum 5%, titanium 0.9%, manganese 0.3%, chromium 5%, zinc 0.3%, strontium 1.0%, silicon 0.8%, and copper 0.5%.

[0032] S1. Place the mixture of the above components into a melting equipment and heat it to 600-700°C at a heating rate of 50-60°C / min, while introducing argon gas into the melting equipment and melting for 8-10 hours.

[0033] S2. Remove the oxide residues floating on the surface of the solution using a scum removal device to obtain the molten material;

[0034] S3. Spray a release agent onto the surface of the die-casting machine mold, and then inject the molten material into the die-casting machine mold to form and solidify it.

[0035] S4. After the punching is completed, hold the pressure for 7-10 minutes, open the mold, and at the same time, use the cooling spray device to spray the cooled liquid to cool the magnesium-aluminum alloy in the mold.

[0036] S5. Remove the magnesium-aluminum alloy sample and anneal and cool it.

[0037] Example 3:

[0038] like Figures 1-3 The invention relates to a magnesium-aluminum alloy and its preparation method. The weight percentage of each element in the magnesium-aluminum casting alloy is as follows: magnesium 68%, aluminum 6%, titanium 0.9%, manganese 0.7%, chromium 5%, zinc 0.4%, strontium 1.2%, silicon 1.2%, and copper 0.8%.

[0039] S1. Place the mixture of the above components into a melting equipment and heat it to 600-700°C at a heating rate of 50-60°C / min, while introducing argon gas into the melting equipment and melting for 8-10 hours.

[0040] S2. Remove the oxide residues floating on the surface of the solution using a scum removal device to obtain the molten material;

[0041] S3. Spray a release agent onto the surface of the die-casting machine mold, and then inject the molten material into the die-casting machine mold to form and solidify it.

[0042] S4. After the punching is completed, hold the pressure for 7-10 minutes, open the mold, and at the same time, use the cooling spray device to spray the cooled liquid to cool the magnesium-aluminum alloy in the mold.

[0043] S5. Remove the magnesium-aluminum alloy sample and anneal and cool it.

[0044]

[0045] The high hardness of Examples 1-3 compared to the control group indicates that the magnesium-aluminum alloy has good mechanical properties and can significantly improve the bonding degree between the various metal components of the magnesium-aluminum alloy, thereby increasing the hardness of the magnesium-aluminum alloy. The high hardness and high tensile strength of Examples 1-3 also indicate that the magnesium-aluminum alloy has better mechanical properties. By adopting the preparation method of this invention, the tensile strength of the magnesium-aluminum alloy can be significantly improved.

[0046] Preferably, the slag cleaning device includes two sets of fixed frames 2, two sets of winding rollers 6 and a screen plate 1. The two sets of fixed frames 2 are respectively located on the upper sides of the smelting equipment, and the two sets of winding rollers 6 are respectively located below the two sets of fixed frames 2. A set of fixed pulleys 5 is installed on each of the two sets of fixed frames 2.

[0047] Both sides of the screen plate 1 are fixedly connected to the top of the lifting frame 8. The top of the two sets of lifting frames 8 are horizontally installed with a horizontal plate 9. Both sets of horizontal plates 9 are connected with steel cables 7. The two sets of steel cables 7 are respectively fixedly connected to the side wall of the winding roller 6 on the same side through the fixed pulley group 5 on the same side. Both sets of winding roller 6 are driven to rotate by the driving component. The steel cables 7 are wound around the side wall of the winding roller 6.

[0048] During the smelting process, oxide slag is generated and floats on the surface of the molten liquid. At this time, the winding roller rotates, the steel cable is wound up, and the screen plate is lifted up through the fixed pulley, and the screen plate picks out the oxide slag.

[0049] Preferably, a telescopic rod 3 is installed at the bottom of both sets of fixing frames 2, the two sets of telescopic rods 3 are arranged opposite to each other, and a locking block 4 is fixedly connected to the top of both sets of telescopic rods 3.

[0050] When the sieve plate rises to a certain height, the telescopic rods of the two sets of fixed frames extend and support the horizontal plate of the sieve plate lifting frame through the two sets of locking blocks, removing the oxide slag on the sieve plate. This can remove impurities generated by the molten liquid and improve the purity of the raw materials.

[0051] Preferably, the smelting equipment is cylindrical, the sieve plate 1 is circular, and there is a gap between the outer wall of the sieve plate 1 and the inner wall of the smelting equipment.

[0052] Preferably, the purity of each powder in the elemental powder filler is not less than 99%, and the powder is ground in a ball mill at a rate of 700 rpm for 1 to 3 hours.

[0053] Preferably, the annealing temperature is between 320 and 350°C.

[0054] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0055] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0056] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0057] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0058] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A magnesium-aluminum alloy, characterized in that, The weight percentage of each element in the magnesium-aluminum casting alloy is as follows: magnesium 65%-68%, aluminum 3%-8%, titanium 0.8%-1.0%, manganese 0.1%-0.8%, chromium 3%-6%, zinc 0.2%-0.4%, strontium 0.5%-1.2%, silicon 0.5%-1.2%, and copper 0.1%-0.8%.

2. A method for preparing a magnesium-aluminum alloy, characterized in that: S1. Place the mixture of the above components into a melting equipment and heat it to 600-700°C at a heating rate of 50-60°C / min, while introducing argon gas into the melting equipment and melting for 8-10 hours. S2. Remove the oxide residues floating on the surface of the solution using a scum removal device to obtain the molten material; S3. Spray a release agent onto the surface of the die-casting machine mold, and then inject the molten material into the die-casting machine mold to form and solidify it. S4. After the punching is completed, hold the pressure for 7-10 minutes, open the mold, and at the same time, use the cooling spray device to spray the cooled liquid to cool the magnesium-aluminum alloy in the mold. S5. Remove the magnesium-aluminum alloy sample and anneal and cool it.

3. The method for preparing a magnesium-aluminum alloy according to claim 2, characterized in that, The slag cleaning device includes two sets of fixed frames (2), two sets of winding rollers (6) and a screen plate (1). The two sets of fixed frames (2) are located on the upper sides of the smelting equipment, and the two sets of winding rollers (6) are located below the two sets of fixed frames (2). Fixed pulley sets (5) are installed on both sets of fixed frames (2). The top of both sides of the screen plate (1) is fixedly connected to a lifting frame (8). The top of the two sets of lifting frames (8) is horizontally installed with a horizontal plate (9). The two sets of horizontal plates (9) are connected with steel cables (7). The two sets of steel cables (7) are respectively fixedly connected to the side wall of the winding roller (6) on the same side through the fixed pulley group (5) on the same side. The two sets of winding rollers (6) are driven to rotate by a driving component. The steel cables (7) are wound around the side wall of the winding roller (6).

4. The method for preparing a magnesium-aluminum alloy according to claim 2, characterized in that, Both sets of the fixing frames (2) are equipped with telescopic rods (3) at their bottoms. The two sets of telescopic rods (3) are arranged opposite to each other, and the tops of the two sets of telescopic rods (3) are fixedly connected with locking blocks (4).

5. The method for preparing a magnesium-aluminum alloy according to claim 2, characterized in that, The smelting equipment is cylindrical, the sieve plate (1) is circular, and there is a gap between the outer wall of the sieve plate (1) and the inner wall of the smelting equipment.

6. A magnesium-aluminum alloy according to claim 1, characterized in that, The purity of each powder in the elemental powder filler is not less than 99%, and the powder is ground in a ball mill at a rate of 700 rpm for 1 to 3 hours.

7. A magnesium-aluminum alloy according to claim 1, characterized in that, The annealing temperature is between 320 and 350℃.

Images