A method for preparing a titanium-magnesium layered composite plate by using titanium-magnesium oxide

Abstract

This invention discloses a method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide, belonging to the field of metal composite materials. The method includes: surface pretreatment, intermediate layer coating, titanium plate surface oxidation treatment, billet preheating, hot rolling composite, and post-rolling annealing. This invention utilizes magnesium oxide powder and the titanium oxide layer as diffusion barrier layers and interfacial reaction layers. During hot rolling, high temperature and large deformation achieve strong metallurgical bonding and mechanical interlocking at the interface, suppressing the formation of harmful brittle phases and avoiding defects such as interfacial cracking and delamination caused by brittle phase aggregation. Unlike traditional preparation methods, the preparation method described in this invention is simple and can achieve high interfacial strength at relatively low pressure. After annealing, the interfacial strength and the toughness of the composite plate can be further improved, providing an effective way to prepare high-performance titanium-magnesium layered composite materials.

Description

Technical Field

[0001] This invention belongs to the field of metal layered composite material preparation technology, specifically relating to a method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide. Background Technology

[0002] Titanium alloys and magnesium alloys have attracted much attention due to their respective excellent properties (titanium alloys have high strength and corrosion resistance, while magnesium alloys have low density and high specific strength). Combining these two alloys to prepare layered materials holds promise for obtaining novel structural materials that combine lightweight, high strength, and good functionality. However, the significant differences in the physicochemical properties of titanium and magnesium, along with their low miscibility, make it difficult to obtain titanium-magnesium composite materials with high bonding strength and stable interfaces using traditional composite methods.

[0003] In existing technologies, liquid-liquid phase composites cannot be performed due to the huge difference in melting points between the two; solid-solid phase composites require extremely high interface cleanliness and precise control of interface reactions and mechanical structures; while liquid-solid phase composites require a vacuum environment due to the easy oxidation of magnesium, resulting in low safety and high cost.

[0004] Hot rolling composite processes offer advantages over other rolling techniques, including high efficiency and low cost. However, due to the significant differences in properties between titanium and magnesium, a certain reduction rate is still required during hot rolling to achieve initial bonding. At this stage, the bonding strength is low, and further heat treatment has limited effect in improving the bonding strength. Therefore, developing a titanium-magnesium composite method that can effectively control interfacial reactions and achieve high-strength metallurgical bonding is of great significance. Summary of the Invention

[0005] To address the aforementioned technical problems, the present invention aims to overcome the shortcomings of the prior art and provide a method for preparing titanium-magnesium composite plates that is simple in process, has high-quality interfacial bonding, and can effectively suppress the formation of brittle phases.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide includes the following steps: Step S1, Surface pretreatment: Mechanically grind the surfaces of the titanium and magnesium plates cut to appropriate sizes to remove the oxide layer and dirt; then clean with organic solvents to remove oil and particulate impurities, and obtain a clean metal surface.

[0007] Step S2, Intermediate layer coating: A layer of magnesium oxide (MgO) powder is uniformly coated on the clean surface of the magnesium plate described in S1 as an interface control layer.

[0008] Step S3, Titanium plate surface oxidation treatment: The titanium plate surface to be composited described in step S1 is subjected to oxidation treatment.

[0009] Step S4, preheating of billet assembly: Magnesium plates coated with magnesium oxide powder are assembled with titanium plates after oxidation treatment, so that the surface of the powder coating comes into contact with the oxide surface of the titanium plate to form a titanium / magnesium double-layer structure billet; then the assembled billet is heated to make the temperature distribution of the billet uniform.

[0010] Step S5, Hot Rolling Composite: The composite billet preheated in step S4 is immediately fed into the rolling mill for hot rolling composite. The rolling is carried out in an atmospheric environment, and the titanium layer and magnesium layer are bonded through single-pass deformation.

[0011] Step S6, Post-rolling annealing: The titanium-magnesium layered composite material obtained in step S5 is kept at 200~500℃ for 60~240min.

[0012] Preferably, in step S1, the mechanical polishing is performed using a wire brush or sandpaper.

[0013] Preferably, the organic solvent is acetone or alcohol, and the cleaning is performed using alcohol, acetone, and alcohol in sequence.

[0014] Preferably, in step S2, the particle size of the magnesium oxide powder is 1-50 micrometers, and the coating amount is based on forming a continuous and uniform thin layer on the surface of the magnesium plate.

[0015] Preferably, in step S3, the oxidation treatment is carried out by heating in a resistance furnace at a temperature of 400℃~550℃ for a preheating time of 8~15 minutes, followed by air cooling. After the oxidation is completely cooled to room temperature, the billets are assembled.

[0016] Preferably, in step S4, the slab needs to be kept at 300℃~500℃ for 20~30 minutes to ensure that each component layer is fully heated.

[0017] Preferably, in step 5, the total deformation of the hot rolling should be greater than 30% to achieve the initial bonding of titanium and magnesium, and the rolling speed is 0.0039m / s to 0.0471m / s.

[0018] Preferably, in step 1, the titanium is a TA1 pure titanium plate and the magnesium is an AZ31 magnesium alloy plate.

[0019] The beneficial effects of this invention compared with the prior art are: (1) The magnesium oxide (MgO) powder layer introduced in this invention can effectively block the direct interdiffusion of atoms such as titanium, magnesium, and aluminum during the heating stage, thereby significantly suppressing brittle intermetallic compounds (such as Ti3Al, TiAl, MgO). 17 Al 12(1) The excessive generation of Mg2Al3 and other substances at the interface can effectively prevent the delamination failure of the composite plate during heating; (2) The present invention oxidizes the surface of the titanium plate, which can cause the titanium oxide layer to break and disperse during the subsequent hot rolling process through the combined action of high temperature and large deformation force. The clean titanium and magnesium fresh metal surfaces are forced to contact closely under the action of large deformation force, and form a strong and tough interface mainly based on mechanical interlocking and local metallurgical bonding through atomic diffusion. The small amount of MgO particles dispersed on the interface may play a pinning and strengthening role, effectively improving the bonding strength of the composite plate; (3) Through the above synergistic effect, the titanium-magnesium composite plate obtained can obtain high interface bonding strength with a small reduction rate. Through subsequent annealing, the elongation and bonding strength of the composite plate are further improved, thereby obtaining a titanium-magnesium composite plate with better mechanical properties than traditional rolling. Attached Figure Description

[0020] Figure 1 This is a flowchart of the method for preparing the titanium-magnesium composite plate according to the present invention.

[0021] Figure 2 This is a schematic diagram of the process for preparing the titanium-magnesium composite plate according to the present invention.

[0022] Figure 3a (This is a scanning electron microscope image of the composite interface in Comparative Example 1.)

[0023] Figure 3b The image shown is a scanning electron microscope image of the composite interface from Example 1.

[0024] Figure reference numerals: 1-Titanium plate; 2-Magnesium plate; 3-Wire brush; 4-Magnesium oxide particles; 5-Electric resistance furnace; 6-Titanium-magnesium slab; 7-Roll; 8-Titanium-magnesium layered composite material. Detailed Implementation

[0025] The technical solution of the present invention will be further described below with reference to specific embodiments.

[0026] The accompanying drawings are used to illustrate embodiments of the present invention and related technologies. These drawings are only some examples, and those skilled in the art can obtain other embodiments based on the drawings without creative effort. The scope of protection of the present invention is not limited to the following embodiments.

[0027] The present invention proposes a method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide, such as... Figure 1 and 2 As shown, the specific implementation process is as follows: Step S1: Surface pretreatment of titanium and magnesium plates: Cut the titanium and magnesium plates to be laminated to appropriate sizes, determined according to actual production needs. The titanium is TA1 pure titanium plate, and the magnesium is AZ31 magnesium alloy plate. Precision cutting equipment is used during the cutting process to avoid defects such as burrs and warping on the edges of the plates. Clean the original hardened layer and dirt from the surfaces to be laminated. Specifically, use a wire brush or sandpaper to polish the surfaces to be laminated to remove the surface oxide layer and hardened layer. Then, use acetone and alcohol to clean the polished surfaces to be laminated. Finally, use a hair dryer to dry the surfaces to be laminated. Step S2, Intermediate layer coating: Magnesium oxide (MgO) powder is uniformly coated on the surface of the magnesium plate to be composited. The particle size of the magnesium oxide powder is 1~50 micrometers. A soft brush is used during the coating process to ensure that the powder layer thickness is uniform and consistent, and to avoid missed coating, accumulation and other situations. Step S3: Surface oxidation treatment of titanium plate: The titanium plate treated in step S1 is subjected to surface oxidation treatment; the oxidation treatment method is resistance furnace heating oxidation, the specific oxidation process is to hold at 400℃~550℃ for 8~15min, and then cool in air. The purpose of oxidation treatment is to form a uniform titanium oxide film on the surface of titanium plate as a transition layer for subsequent interface bonding, and at the same time further improve the surface activity of titanium plate. Step S4, Preheating of billet assembly: The magnesium plate and titanium plate obtained in steps S2 and S3 are assembled into a billet. During assembly, ensure that the magnesium oxide coating surface of the magnesium plate and the oxide surface of the titanium plate are precisely aligned and tightly bonded to avoid misalignment, gaps and other problems. The billet is preheated in an electric resistance furnace at 300℃~500℃ for 20~30 minutes to ensure that each layer of metal is heated evenly. Step S5, hot rolling composite: The uniformly heated slab obtained in step S4 is rolled at a rolling speed of 0.0039m / s to 0.0471m / s and a reduction of more than 30% to achieve the initial composite of the two and obtain a preliminary titanium-magnesium composite plate. Step S6, Post-rolling annealing: The titanium-magnesium composite plate obtained in step S5 is annealed under the following conditions: 200~500℃ for 60~240min. The annealing temperature can be flexibly adjusted according to the thickness and performance requirements of the composite plate. When the thickness is thicker, the temperature can be increased and the holding time can be extended. Then, the plate is cooled in the furnace to obtain the final titanium-magnesium composite plate.

[0028] Example 1: As Figure 2 As shown, Example 1 is an example of composite rolling of TA1 titanium plate 1 to be rolled and AZ31 magnesium plate 2 to be rolled; Step S1, Surface Pretreatment: Perform surface pretreatment on titanium and magnesium plates: cut the titanium plate to 2*70*110mm. 3 Magnesium plates were cut to 3*70*110mm. 3Then, a 0.3mm diameter steel wire brush was used to polish the surfaces of the TA1 titanium plate and AZ31 magnesium plate to be laminated to remove the surface oxide layer and hardened layer. Then, acetone and alcohol were used to clean the polished surfaces. Finally, a hair dryer was used to dry the surfaces. Step S2, Intermediate Layer Coating: Use a soft brush to evenly coat magnesium oxide powder onto the surface of the AZ31 magnesium plate to be laminated; Step S3: Surface oxidation treatment of TA1 titanium plate: Heat the titanium plate at 400℃ for 10 min, then air cool it to obtain a uniform oxide layer on the surface of the titanium plate. Step S4, preheating of billet assembly: The magnesium plate and titanium plate obtained in steps S2 and S3 are assembled into a billet, and then held at 400℃ for 20~30min to ensure that each layer of metal is heated evenly. Step S5, Hot rolling composite: The uniformly heated slab obtained in step S4 is rolled at a rolling speed of 0.04 m / s and a reduction of 35% to achieve the initial composite of the two and obtain a titanium-magnesium composite plate. Step S6, Post-rolling annealing: The titanium-magnesium composite plate obtained in step S5 is annealed under the following conditions: 200℃ for 180 min, followed by furnace cooling.

[0029] Comparative Example 1: No magnesium oxide powder was coated, and the titanium plate was not preheated and oxidized separately. Other steps were the same as in Example 1.

[0030] Figure 3a (This is a scanning electron microscope image of the composite interface in Comparative Example 1.) Figure 3b The image shown is a scanning electron microscope image of the composite interface in Example 1. In Example 1, the tensile shear strength of the sheet material under 35% compression was 74.53 MPa, while the strength of the titanium-magnesium layered composite material in Comparative Example 1 was only 48.74 MPa. The tensile shear strength of the sheet material in Example 1 was increased by approximately 53% compared to Comparative Example 1. After annealing, the tensile shear strength of Example 1 further increased to 106.80 MPa, while that of Comparative Example 1 only reached 80.03 MPa. This indicates that the material treated by the method of the present invention not only has high initial bonding strength, but also exhibits greater performance enhancement during the annealing process, resulting in a significant final strength advantage.

[0031] The above embodiments demonstrate that the present invention can effectively prepare titanium-magnesium composite plates with excellent interfacial bonding by introducing magnesium oxide powder, oxidizing the surface of titanium plates, and combining it with a specific hot rolling process.

[0032] All matters not covered in this invention are common knowledge.

[0033] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide, characterized in that, Includes the following steps: S1. Surface pretreatment: Cut the titanium and magnesium plates to be laminated to appropriate sizes, and grind and clean the surfaces of the titanium and magnesium plates to be laminated to obtain a clean surface. S2, Intermediate layer coating: Coat the surface of the magnesium plate after step S1 with a layer of magnesium oxide (MgO) powder; S3. Surface oxidation treatment of titanium plate: The titanium plate after step S1 is subjected to surface oxidation treatment. S4. Preheating of billet assembly: The magnesium plate obtained in step S2 and the titanium plate obtained in step S3 are assembled into billets and preheated in an electric resistance furnace. S5. Hot rolling composite: The preheated billet from step S4 is hot rolled composite to obtain a preliminary titanium-magnesium composite plate. S6. Post-rolling annealing: The titanium-magnesium composite plate obtained in step S5 is annealed by holding it at a temperature range of 200~500℃ for 60~240min to obtain the final titanium-magnesium composite plate.

2. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, The polishing method in step S1 is to use a wire brush or sandpaper.

3. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, The cleaning agents in step S1 are acetone and alcohol.

4. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, The particle size of the magnesium oxide powder in step S2 is 1~50 micrometers.

5. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, The oxidation process of the titanium plate surface in step S3 involves holding it at 400~550℃ in a resistance furnace for 8~15 minutes, followed by cooling in air.

6. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, The heating temperature in step S4 is 300~500℃, and the heating time is 20~30min.

7. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, The hot rolling speed in step S5 is 0.0039 m / s to 0.0471 m / s, and the single-pass rolling reduction rate should be greater than 30% to achieve the initial composite of titanium and magnesium.

8. The method for preparing titanium-magnesium layered composite plates using titanium-magnesium oxide according to claim 1, characterized in that, In step S1, the titanium is TA1 pure titanium plate and the magnesium is AZ31 magnesium alloy plate.

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