A method for producing a millimeter-scale ceramic particle-reinforced aluminum alloy sheet member

Abstract

The application is a kind of preparation method of millimeter ceramic particle reinforced aluminum alloy plate component, which comprises the following steps: processing regular and uniform arranged blind holes (7) on the surface of aluminum alloy plate (5), placing millimeter ceramic particles (4) in the blind holes (7), then filling and paving aluminum alloy powder (6) layer by layer and compacting above the ceramic particles (4) until a reinforcing layer is formed to bury the ceramic particles (4) in it, and finally obtaining the millimeter ceramic particle reinforced aluminum alloy plate component. The preparation method solves the problem that the traditional preparation process cannot meet the uniform arrangement of the reinforcing phase, realizes the preparation of the ceramic particle reinforced aluminum alloy plate by powder metallurgy + step strengthening, and improves the overall strength of the armor plate.

Description

Technical Field

[0001] This invention relates to a method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components, belonging to the field of hot working technology. Background Technology

[0002] Currently, researchers abroad are studying the mechanism by which the bonding strength between the aluminum matrix and carbon fibers affects the strength of carbon fiber reinforced aluminum matrix composites. Results show that weakening the bonding strength increases the overall strength of the material, enhancing its resistance to crack propagation. This research will contribute to the development of new composite materials to replace metal components used in the aerospace industry.

[0003] Ceramic particle reinforced aluminum-based alloys are generally used to manufacture armor plates for tanks and armored vehicles. Traditional manufacturing processes include casting and forging. Casting of ceramic particle reinforced aluminum-based alloy plates cannot guarantee the regular arrangement of the reinforcing phases and cannot improve the overall performance of the armor plate. Forging of ceramic particle reinforced aluminum-based alloy plates often requires a large-tonnage hydraulic press to forcefully press the ceramic particles into the aluminum alloy matrix, causing damage to the matrix. Summary of the Invention

[0004] This invention addresses the shortcomings of the existing technology by providing a method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components. Its purpose is to solve the problem that traditional preparation processes cannot achieve uniform arrangement of reinforcing phases, and realize the preparation of ceramic particle-reinforced aluminum alloy plates using powder metallurgy and step strengthening, thereby improving the overall strength of the armor plate.

[0005] The objective of this invention is achieved through the following technical solution:

[0006] The method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components proposed in this invention is characterized by the following: the preparation method involves processing regularly and uniformly arranged blind holes 7 on the surface of an aluminum alloy plate 5, placing millimeter-scale ceramic particles 4 inside the blind holes 7, and then layering aluminum alloy powder 6 on top and compacting it until a reinforcing layer in which the ceramic particles 4 are embedded is formed, thereby obtaining a millimeter-scale ceramic particle-reinforced aluminum alloy plate component.

[0007] This technical solution effectively solves the problem that traditional preparation processes such as embedding, powder metallurgy, and casting cannot achieve uniform arrangement of the reinforcing phase. By pre-embedding and gradient powder metallurgy, the directional distribution of reinforcing particles is effectively guaranteed.

[0008] In practice, the diameter of the blind hole 7 is 1–1.5 mm, and the depth is 0.5–1 mm. The diameter of the blind hole is approximately 8% of the diameter of the reinforcing particle, and the depth is approximately 10%, ensuring that the pre-embedded part only serves a positioning function, and the subsequent strengthening mainly relies on gradient powder metallurgy.

[0009] Furthermore, the blind holes 7 are arranged in rows at equal intervals, with the center-to-center spacing being twice the diameter of the ceramic particles 4.

[0010] In practice, the millimeter-sized ceramic particles 4 are biconical in shape, with a diameter of 7-10 mm and a height of 10-15 mm.

[0011] During implementation, before each layer of aluminum alloy powder 6 is laid and compacted, the laid aluminum alloy powder 6 is heated and kept at a temperature of 350-480℃ and a holding time of 0.5-1h.

[0012] Furthermore, before each layer of aluminum alloy powder 6 is laid and compacted, a plasma discharger 2 is used to treat the laid aluminum alloy powder 6 to break off the oxides on the surface of the aluminum alloy powder 6.

[0013] In practice, the device used to prepare millimeter-sized ceramic particle reinforced aluminum alloy plate components includes a pressure head 1, a plasma discharger 2, and a heating device 3. The plasma discharger 2 is placed inside the pressure head 1, and a cylindrical heating device 3 surrounds the outer edge of the pressure head 1. The pressure head 1 can move up and down along the inner cavity of the heating device 3. An aluminum alloy plate 5 is placed at the bottom of the heating device 3. Blind holes 7 are machined on the upper surface of the aluminum alloy plate 5 for placing millimeter-sized ceramic particles 4, and aluminum alloy powder 6 is filled on it. Then, the pressure head 1 is used to compact the particles layer by layer.

[0014] In practice, the preparation method involves the following steps:

[0015] Step 1: Preparation of Aluminum Alloy Plate Blank

[0016] Prepare an aluminum alloy plate with a thickness of 5-10mm. Machine blind holes 7 in rows on the surface of the aluminum alloy plate. The spacing between adjacent blind holes 7 is the same. The diameter of the blind holes is 1-1.5mm and the depth is 0.5-1mm. Then clean the surface of the aluminum alloy plate and the blind holes 7.

[0017] Step 2: Preparation of the preparation apparatus

[0018] The apparatus used to prepare millimeter-sized ceramic particle-reinforced aluminum alloy plate components includes a pressure head 1, a plasma discharger 2, and a heating device 3. The plasma discharger 2 is placed inside the pressure head 1, and a cylindrical heating device 3 surrounds the outer edge of the pressure head 1. The pressure head 1 can move up and down along the inner cavity of the heating device 3. An aluminum alloy plate 5 is placed at the bottom of the heating device 3. The outer edge shape and size of the aluminum alloy plate 5 match the shape and size of the inner surface of the heating device 3. Blind holes 7 are machined on the upper surface of the aluminum alloy plate 5 for placing millimeter-sized ceramic particles 4.

[0019] Step 3, Suppression

[0020] Place the aluminum alloy plate 5 flat at the bottom of the heating device (3). Place millimeter-sized ceramic particles 4 in the blind holes 7 on the upper surface of the aluminum alloy plate 5. The ceramic particles 4 are biconical, with a diameter of 7-10 mm and a height of 10-15 mm. Then, spread aluminum alloy powder 6 on the upper surface of the aluminum alloy plate 5. The layer height of the aluminum alloy powder 6 should exceed the top of the ceramic particles 4. Start the heating device 3 to heat the aluminum alloy powder 6 layer. When the temperature reaches 350-480℃, start heat preservation. The heat preservation time is... For 0.5 to 1 hour, while heating, the plasma discharger 2 is started to break off the oxides on the surface of the aluminum alloy powder 6. Then, the pressure head 1 is moved downward at a speed of 0.0005 to 0.01 s-1 until the lower surface of the pressure head 1 contacts the top of the ceramic particles (4). The pressure head 1 is then moved upward, and aluminum alloy powder 6 is added again. The above operation is repeated until the lower surface of the pressure head 1 can no longer contact the top of the ceramic particles 4 and a reinforcing layer is formed to embed the ceramic particles 4 in it, thus completing the pressing process.

[0021] In the process of preparing ceramic particle reinforced aluminum alloy plate components, the aluminum alloy powder is added quantitatively multiple times and compacted repeatedly, which indirectly weakens the bonding strength between some layers of aluminum alloy powder, matrix and reinforcing particles, but the effect is to improve the overall strength, which is equivalent to the overall component being tough on the outside and tough on the inside, with stronger impact resistance.

[0022] Step 4: Post-processing

[0023] After the aluminum alloy plate with the reinforced layer is cooled to room temperature, it is taken out and sandblasted to obtain a millimeter-scale ceramic particle reinforced aluminum alloy plate component.

[0024] The features and beneficial effects of the technical solution of this invention are as follows:

[0025] 1. The technical solution of the present invention uses the regularly and uniformly arranged blind holes 7 in the aluminum alloy plate 5 to fix the position of ceramic particles (4). This technical measure can effectively solve the problem that the traditional preparation process cannot make the reinforcing phase uniformly arranged. In addition to enhancing the mechanical properties of the particles and the matrix itself, the component interface characteristics provided by this technical measure compared with the traditional forging embedding method also help to enhance the mechanical properties of the entire component. Because if the reinforcing particles are too strong in bonding with the matrix, they cannot prevent the expansion of cracks in the component, resulting in premature failure of the component. Therefore, the preparation method of the present invention is more effective, simpler and lower in cost.

[0026] 2. In the process of preparing ceramic particle reinforced aluminum alloy plate components, the aluminum alloy powder is added quantitatively multiple times and compacted repeatedly, which indirectly weakens the bonding strength between some layers of aluminum alloy powder, matrix and reinforcing particles, but the effect is to improve the overall strength, which is equivalent to the overall component being tough on the outside and tough on the inside, and has stronger impact resistance.

[0027] 3. The mechanical properties of the ceramic particle reinforced aluminum alloy plate components prepared by the method of the present invention show an almost linear change. The strength of the matrix and interface decreases, but the strength of the entire material increases from 1450MPa to 2365MPa. This is because the load distribution of the reinforcing particles in the technical solution of the present invention is more uniform and the stress at the crack end is more concentrated. This reason and effect can also be further explained as the weak boundary being a mechanical melting mechanism for crack propagation.

[0028] 4. The preparation method described in this invention can also be extended to the design and manufacture of multilayer heterogeneous transition materials. During the entire pressing process, the component is always under heating and pressure, which can prioritize pressing powders that require a long diffusion time and press powders with a short diffusion time last, so that the component as a whole maintains both connection strength and uniformity of structure. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the preparation method of the millimeter-scale ceramic particle reinforced aluminum alloy plate component described in this invention;

[0030] Figure 2 This is a schematic diagram of processing blind holes on the surface of an aluminum alloy plate in the technical solution of the present invention; Detailed Implementation

[0031] The technical solution of the invention will be further described in detail below with reference to the accompanying drawings and embodiments:

[0032] See appendix Figure 1 , 2 As shown, in this embodiment, the preparation method comprises the following steps:

[0033] Step 1: Preparation of Aluminum Alloy Plate Blank

[0034] Prepare an aluminum alloy plate with a thickness of 5-10mm. Machine blind holes 7 in rows on the surface of the aluminum alloy plate. The spacing between adjacent blind holes 7 is the same. The diameter of the blind holes is 1-1.5mm and the depth is 0.5-1mm. Then clean the surface of the aluminum alloy plate and the blind holes 7.

[0035] Step 2: Preparation of the preparation apparatus

[0036] The apparatus used to prepare millimeter-sized ceramic particle-reinforced aluminum alloy plate components includes a pressure head 1, a plasma discharger 2, and a heating device 3. The plasma discharger 2 is placed inside the pressure head 1, and a cylindrical heating device 3 surrounds the outer edge of the pressure head 1. The pressure head 1 can move up and down along the inner cavity of the heating device 3. An aluminum alloy plate 5 is placed at the bottom of the heating device 3. The outer edge shape and size of the aluminum alloy plate 5 match the shape and size of the inner surface of the heating device 3. Blind holes 7 are machined on the upper surface of the aluminum alloy plate 5 for placing millimeter-sized ceramic particles 4.

[0037] Step 3, Suppression

[0038] Place the aluminum alloy plate 5 flat at the bottom of the heating device (3). Place millimeter-sized ceramic particles 4 in the blind holes 7 on the upper surface of the aluminum alloy plate 5. The ceramic particles 4 are biconical, with a diameter of 7-10 mm and a height of 10-15 mm. Then, spread aluminum alloy powder 6 on the upper surface of the aluminum alloy plate 5. The layer height of the aluminum alloy powder 6 should exceed the top of the ceramic particles 4. Start the heating device 3 to heat the aluminum alloy powder 6 layer. When the temperature reaches 350-480℃, start heat preservation. The heat preservation time is... For 0.5 to 1 hour, while heating, the plasma discharger 2 is started to break off the oxides on the surface of the aluminum alloy powder 6. Then, the pressure head 1 is moved downward at a speed of 0.0005 to 0.01 s-1 until the lower surface of the pressure head 1 contacts the top of the ceramic particles (4). The pressure head 1 is then moved upward, and aluminum alloy powder 6 is added again. The above operation is repeated until the lower surface of the pressure head 1 can no longer contact the top of the ceramic particles 4 and a reinforcing layer is formed to embed the ceramic particles 4 in it, thus completing the pressing process.

[0039] Step 4: Post-processing

[0040] After the aluminum alloy plate with the reinforced layer is cooled to room temperature, it is taken out and sandblasted to obtain a millimeter-scale ceramic particle reinforced aluminum alloy plate component.

Claims

1. A method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components, characterized in that: The preparation method involves processing regular and uniformly arranged blind holes (7) on the surface of an aluminum alloy plate (5), placing millimeter-sized ceramic particles (4) inside the blind holes (7), and then layering aluminum alloy powder (6) on top of them and compacting it until a reinforcing layer is formed in which the ceramic particles (4) are embedded, thus obtaining a millimeter-sized ceramic particle-reinforced aluminum alloy plate component; before each layer of aluminum alloy powder (6) is filled and compacted, the filled aluminum alloy powder (6) is heated and kept at a temperature of 350-480℃ and a holding time of 0.5-1h; before each layer of aluminum alloy powder (6) is filled and compacted, a plasma discharger (2) is used to treat the filled aluminum alloy powder (6) to break off the oxides on the surface of the aluminum alloy powder (6).

2. The method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components according to claim 1, characterized in that: The diameter of the blind hole (7) is 1 to 1.5 mm and the depth is 0.5 to 1 mm.

3. The method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components according to claim 1 or 2, characterized in that: The blind holes (7) are arranged in rows at equal intervals, with the center-to-center spacing being twice the diameter of the ceramic particles (4).

4. The method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components according to claim 1, characterized in that: The millimeter-sized ceramic particles (4) are biconical in shape, with a diameter of 7-10 mm and a height of 10-15 mm.

5. The method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components according to claim 1, characterized in that: The device used to prepare millimeter-sized ceramic particle reinforced aluminum alloy plate components includes a pressure head (1), a plasma discharger (2) and a heating device (3). The plasma discharger (2) is placed inside the pressure head (1). A cylindrical heating device (3) surrounds the outer edge of the pressure head (1). The pressure head (1) can move up and down along the inner cavity of the heating device (3). An aluminum alloy plate (5) is placed at the bottom of the heating device (3). Blind holes (7) are machined on the upper surface of the aluminum alloy plate (5) for placing millimeter-sized ceramic particles (4). Aluminum alloy powder (6) is then filled on it and compacted layer by layer by the pressure head (1).

6. The method for preparing millimeter-scale ceramic particle-reinforced aluminum alloy plate components according to claim 1, characterized in that: The preparation method involves the following steps: Step 1: Preparation of Aluminum Alloy Plate Blank Prepare an aluminum alloy plate with a thickness of 5-10mm. Process blind holes (7) arranged in rows on the surface of the aluminum alloy plate. The spacing between adjacent blind holes (7) is the same. The diameter of the blind holes is 1-1.5mm and the depth is 0.5-1mm. Then clean the surface of the aluminum alloy plate and the blind holes (7). Step 2: Preparation of the preparation apparatus The device used to prepare millimeter-sized ceramic particle reinforced aluminum alloy plate components includes a pressure head (1), a plasma discharger (2) and a heating device (3). The plasma discharger (2) is placed inside the pressure head (1). A cylindrical heating device (3) surrounds the outer edge of the pressure head (1). The pressure head (1) can move up and down along the inner cavity of the heating device (3). An aluminum alloy plate (5) is placed at the bottom of the heating device (3). The outer edge shape and size of the aluminum alloy plate (5) match the shape and size of the inner surface of the heating device (3). Blind holes (7) are machined on the upper surface of the aluminum alloy plate (5) for placing millimeter-sized ceramic particles (4). Step 3, Suppression Place the aluminum alloy plate (5) flat at the bottom of the heating device (3). Place millimeter-sized ceramic particles (4) in the blind holes (7) on the upper surface of the aluminum alloy plate (5). The ceramic particles (4) are biconical with a diameter of 7-10 mm and a height of 10-15 mm. Then, spread aluminum alloy powder (6) on the upper surface of the aluminum alloy plate (5). The layer height of the aluminum alloy powder (6) should exceed the top of the ceramic particles (4). Start the heating device (3) to heat the aluminum alloy powder (6) layer. When the temperature reaches 350-480℃, start heat preservation. The heat preservation time is... For 0.5~1h, while heating, the plasma discharger (2) is started to break off the oxides on the surface of the aluminum alloy powder (6). Then, the pressure head (1) is moved downward at a speed of 0.0005~0.01s-1 until the lower surface of the pressure head (1) contacts the top of the ceramic particles (4). The pressure head (1) is then moved upward, and aluminum alloy powder (6) is added again. The above operation is repeated until the lower surface of the pressure head (1) can no longer contact the top of the ceramic particles (4) and a reinforcing layer is formed to embed the ceramic particles (4) in it, thus completing the pressing process. Step 4: Post-processing After the aluminum alloy plate (5) with the reinforced layer is cooled to room temperature, it is taken out and sandblasted to obtain a millimeter-sized ceramic particle reinforced aluminum alloy plate component.

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