A low-cost high-performance titanium matrix composite plate manufacturing method

Abstract

The application relates to a low-cost high-performance titanium-based composite plate preparation method. First, ingredients are prepared, smelting is carried out, an ingot is prepared, and a titanium-based composite slab is obtained through cutting. The raw materials include 3%-6% of high-purity Cr3C2 powder, and the balance is 0-grade titanium sponge particles; then the surface of the titanium-based composite slab is polished, alkali-washed, acid-washed, and air-dried, a high-temperature oxidation-resistant coating is coated on the surface of the slab, the slab is subjected to incremental gradient deformation hot rolling treatment, and the slab is air-cooled to room temperature to obtain a semi-finished titanium-based composite plate; finally, the plate is subjected to annealing treatment, the surface of the plate is polished, alkali-washed, acid-washed, and air-dried after the annealing treatment, and a finished titanium-based composite plate is obtained. The application shortens the hot rolling process, avoids the oxidation problem of the plate caused by multiple times of hot rolling treatment, effectively controls the distribution mode of the reinforcing phase in the titanium-based composite plate, realizes the uniform distribution of the reinforcing phase, and is simple in process, so the production cost is lower.

Description

Technical Field

[0001] This invention belongs to the field of metal matrix composite technology, specifically relating to a low-cost, high-performance titanium matrix composite material plate preparation method. Background Technology

[0002] Titanium alloys possess characteristics such as low density, high specific strength, good corrosion resistance, and good biocompatibility, leading to their widespread application in aerospace, marine engineering, petrochemical, and biomedical fields. However, titanium and titanium alloys have relatively low hardness and poor wear resistance, failing to meet the high hardness and high wear resistance requirements of specialized applications. Titanium-based composite materials also exhibit low density, high specific strength, and good corrosion resistance. Furthermore, compared to traditional titanium and titanium alloys, titanium-based composite materials possess higher elastic modulus, superior wear resistance, and high-temperature performance. Therefore, addressing the urgent need for high-performance metallic structural materials in aerospace, defense, and marine engineering, low-cost, high-performance titanium-based composite material sheets are excellent candidate materials for meeting performance indicators such as low density, high specific strength, high elastic modulus, high hardness, and high wear resistance.

[0003] However, due to the significant differences in mechanical properties, physical properties, and microstructure between the reinforcing phase and the titanium matrix in titanium-based composites, the processing and molding of titanium-based composites is quite challenging, especially the preparation technology for titanium-based composite sheets, which is still not mature. Existing related technologies mainly employ powder metallurgy or casting methods to prepare titanium-based composite ingots, followed by hot rolling to prepare titanium-based composite sheets. Patent CN113828776A discloses a method for preparing TiBw-reinforced titanium-based composite sheets, which involves: powder metallurgy ingot preparation, multi-stage hot rolling, and annealing to obtain titanium-based composite sheets. However, this method has high processing costs, produces sheets with low density, and is prone to sintering porosity. Furthermore, this method requires 5-10 stages of hot rolling, which can lead to the absorption of excessive oxygen, carbon, nitrogen, and other impurities during the hot rolling process, reducing the performance of the titanium-based composite sheets. Patent CN111500957A uses a process of "melting and casting ingots + forging + hot rolling" to prepare titanium-based composite material plates. This process requires 16 hot rolling passes. The multiple hot rolling processes can also cause the plates to absorb too many impurity elements during the hot rolling process, thereby reducing the mechanical properties of the titanium-based composite material plates.

[0004] In summary, shortening and simplifying the rolling process of titanium-based composite sheet, reducing sheet oxidation, optimizing the rolling process, and lowering process costs have significant engineering application value and importance. Summary of the Invention

[0005] This invention provides a low-cost, high-performance titanium-based composite material sheet preparation method to solve the problems of long rolling process, sheet oxidation, and high process cost in the existing technology.

[0006] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing low-cost, high-performance titanium-based composite material plates, comprising the following steps:

[0007] Step 1: Batching, smelting, preparing ingots, and cutting to obtain titanium-based composite material slabs. The raw materials include 2%-6% high-purity Cr3C2 powder by weight, with the remainder being grade 0 sponge titanium particles.

[0008] Step 2: Grind, alkali wash, acid wash, and air dry the surface of the titanium-based composite material slab. Coat the slab surface with a high-temperature anti-oxidation coating. Perform incremental gradient deformation hot rolling on the slab. After hot rolling, air cool the slab to room temperature to obtain a semi-finished titanium-based composite material slab.

[0009] Step 3: Anneal the semi-finished titanium-based composite material sheet. After annealing, the surface of the sheet is polished, alkali-washed, acid-washed, and dried to obtain the finished titanium-based composite material sheet.

[0010] Furthermore, the purity of the aforementioned Grade 0 sponge titanium is ≥99.97%, the particle size of the Grade 0 sponge titanium particles is 2-10 mm, the purity of the Cr3C2 powder is ≥99.95%, and the particle size of the Cr3C2 powder is 0.325 mm.

[0011] Furthermore, in step one above, a vacuum induction levitation melting furnace is used to melt the titanium-based composite material. Before melting, the inside of the melting furnace is evacuated to a vacuum level of 3-5 × 10⁻⁶. -3 Pa, and argon gas is introduced for atmosphere protection; the induction power supply during melting is 200-400kW, the melting time is 20-40min, and after melting, it is cooled to room temperature to obtain titanium-based composite material ingot.

[0012] Furthermore, in step two above, the incremental gradient deformation rolling process is as follows: the rolling pressure is 500T, the rolling speed is 3m / s; the deformation amount of the first pass is 10%, the deformation amount of the second pass is 20%, and the deformation amount of the third pass is 30%. Before each pass, the plate is placed in a heating furnace at 1000℃ and kept warm for 10 minutes. After the last rolling pass, the plate is air-cooled to room temperature to obtain a semi-finished titanium-based composite material plate with a total rolling deformation of about 60%.

[0013] Furthermore, in step three above, the semi-finished titanium-based composite material sheet is placed in a heating furnace at 600°C and kept at that temperature for 120 minutes for annealing treatment, and then air-cooled to room temperature to obtain the titanium-based composite material sheet.

[0014] Compared with the prior art, the present invention has the following advantages:

[0015] 1. This invention proposes an "incremental gradient deformation" hot rolling technology for rolling titanium-based composite sheet, which allows the titanium-based composite slab to quickly achieve the expected deformation amount in only three hot rolling processes, shortening the hot rolling process and avoiding the oxidation problem caused by multiple hot rolling processes. This invention prepares titanium-based composite ingots through vacuum induction suspension melting technology, resulting in strong bonding between the reinforcing phase and the titanium matrix in the titanium-based composite, high density, and good overall performance. The "incremental gradient deformation" hot rolling technology of this invention can effectively control the distribution morphology of the reinforcing phase in the titanium-based composite sheet, achieving a uniform distribution of the reinforcing phase.

[0016] 2. The process of this invention is simple, thus resulting in lower production costs. The titanium-based composite material sheet prepared by this invention exhibits excellent comprehensive mechanical properties after annealing at 600℃ for 120 minutes. The room temperature tensile strength is 584 MPa, and the elongation after fracture reaches 17%, demonstrating excellent strength-plasticity balance. Attached Figure Description

[0017] Figure 1 The image shows the macroscopic morphology of the low-cost titanium-based composite material plate of Example 1 of the present invention.

[0018] Figure 2 This is the microstructure of the low-cost titanium-based composite material plate of Example 1 of the present invention.

[0019] Figure 3 The room temperature tensile properties of the annealed titanium-based composite material sheet of Example 1 of the present invention. Detailed Implementation

[0020] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0021] Example 1: A method for preparing a low-cost, high-performance titanium-based composite material plate, comprising the following steps:

[0022] Step 1: Prepare a raw material package containing titanium particles and chromium carbide powder by weight percentage. The titanium particles are grade 0 sponge titanium particles with a purity ≥99.97% and a particle size of 2-10 mm. The chromium carbide powder is high-purity Cr3C2 powder with a purity ≥99.95% and a particle size of 0.325 mm. The high-purity Cr3C2 powder accounts for 3% of the weight percentage, with the remainder being grade 0 sponge titanium particles. The titanium-based composite material is smelted using a vacuum induction levitation melting furnace. Before vacuum induction levitation melting, the furnace is evacuated to a vacuum level of 5 × 10⁻⁶. -3 Pa, and argon gas is introduced for atmosphere protection. The induction power supply during the vacuum induction suspension melting is 300kW, the melting time is 30min, and the furnace is cooled to room temperature after melting to obtain a titanium-based composite material ingot. The ingot is cut to obtain a 10mm thick titanium-based composite material slab.

[0023] Step 2: Grind, alkali wash, acid wash, and air dry the surface of the titanium-based composite slab from Step 1, and coat the slab surface with a high-temperature anti-oxidation coating; place the titanium-based composite slab in a heating furnace at 1000℃ and hold for 30 minutes, then perform "incremental gradient deformation" rolling on a rolling mill with a rolling pressure of 500T and a rolling speed of 3m / s. The deformation amount of the first pass is 10%, the deformation amount of the second pass is 20%, and the deformation amount of the third pass is 30%. During the interval between each rolling pass, place the plate in a heating furnace at 1000℃ and hold for 10 minutes. After the last rolling pass, air cool the plate to room temperature to obtain a semi-finished titanium-based composite slab with a total rolling deformation of 60%.

[0024] Step 3: Place the semi-finished titanium-based composite material sheet in a heating furnace at 600℃ for 120 minutes for annealing treatment, then air cool to room temperature. After annealing, grind, alkali wash, acid wash, and air dry the surface of the titanium-based composite material sheet to obtain a finished titanium-based composite material sheet with a thickness of about 4mm.

[0025] from Figure 1 As can be seen, the low-cost titanium-based composite material sheet prepared in Example 1 of this invention has a perfect and defect-free appearance.

[0026] from Figure 2 It can be seen that the reinforcing phase is uniformly distributed in the low-cost titanium-based composite material plate prepared in Example 1 of the present invention.

[0027] from Figure 3 It can be seen that the low-cost titanium-based composite material sheet prepared in Example 1 of the present invention has good room temperature tensile properties, with a room temperature tensile strength of 584 MPa and an elongation after fracture of 17%, exhibiting a good strength-plasticity match.

[0028] Example 2 differs from Example 1 in that the weight percentage of high-purity Cr3C2 powder added to the titanium-based composite material is 6%, while the rest is the same as in Example 1.

[0029] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the inventive essence shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing low-cost, high-performance titanium-based composite material plates, characterized in that, Includes the following steps: Step 1: Batching, smelting, preparing ingots, and cutting to obtain titanium-based composite material slabs. The raw materials include 2%-6% high-purity Cr3C2 powder by weight, with the remainder being grade 0 sponge titanium particles. Step 2: Grind, alkali wash, acid wash, and air dry the surface of the titanium-based composite material slab. Coat the slab surface with a high-temperature anti-oxidation coating. Perform incremental gradient deformation hot rolling on the slab. After hot rolling, air cool the slab to room temperature to obtain a semi-finished titanium-based composite material slab. Step 3: Anneal the semi-finished titanium-based composite material sheet. After annealing, grind, alkali wash, acid wash, and dry the surface of the sheet to obtain the finished titanium-based composite material sheet. The purity of the grade 0 sponge titanium is ≥99.97%, and the particle size of the grade 0 sponge titanium particles is 2-10 mm. The purity of the Cr3C2 powder is ≥99.95%, and the particle size of the Cr3C2 powder is 0.325 mm. In Step 1, a vacuum induction levitation melting furnace is used to melt the titanium-based composite material. Before melting, the inside of the melting furnace is evacuated to a vacuum degree of 3-5 × 10⁻⁶. -3 Pa, and argon gas is introduced for atmosphere protection; the induction power supply during melting is 200-400 kW, the melting time is 20-40 min, and after melting, it is cooled to room temperature to obtain a titanium-based composite material ingot; in step two, the incremental gradient deformation rolling process is as follows: the rolling pressure is 500 T, the rolling speed is 3 m / s; the deformation amount of the first pass is 10%, the deformation amount of the second pass is 20%, the deformation amount of the third pass is 30%, and the plate is placed in a heating furnace at 1000℃ for 10 min between each pass rolling interval. After the last rolling, the plate is air-cooled to room temperature to obtain a semi-finished titanium-based composite material plate with a total rolling deformation of 60%.

2. The method for preparing a low-cost, high-performance titanium-based composite material plate according to claim 1, characterized in that: In step three, the semi-finished titanium-based composite material sheet is placed in a heating furnace at 600°C and kept at that temperature for 120 minutes for annealing treatment, and then air-cooled to room temperature to obtain the titanium-based composite material sheet.

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