Preparation method of titanium metal surface laser sintering rare earth metal modified polyether-ether-ketone composite material

Abstract

The invention discloses a preparation method of a titanium metal surface laser sintering rare earth metal modified polyether-ether-ketone composite material, and belongs to the field of dental implants. The invention aims to solve the technical problem of poor interface bonding property between polyether-ether-ketone and titanium metal. The method comprises the following steps: completely dissolving CeCl3 and urea in an ethanol water solution, immersing hydroxylated polyether-ether-ketone in the CeCl3 solution at room temperature, heating for reaction, cooling to room temperature, cleaning and drying to obtain cerium oxide modified polyether-ether-ketone powder; the surface of a titanium metal substrate is pretreated, the titanium metal substrate is placed in a forming cavity of additive manufacturing equipment, cerium oxide modified polyether-ether-ketone powder is formed in a powder feeding cavity under the protection of inert gas through a laser powder bed melting technology, heat preservation treatment is conducted after printing is finished, and then the method is completed. According to the method, a Ti-O-Ce bonding or CeTiO4 spinel structure is formed on the surface of cerium oxide and titanium, an interface inert layer is broken, chemical bond bonding of polyether-ether-ketone and a titanium matrix is achieved, and the interface bonding strength is remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of dental implants, and more specifically, relates to a method for preparing a rare earth metal modified polyether ether ketone composite material with a titanium metal surface by laser sintering. Background Technology

[0002] Titanium, as the "gold standard" material in dentistry, presents significant stress shielding challenges. Polyetheretherketone (PEEK), widely used in bone implants due to its excellent biocompatibility and elastic modulus similar to bone, is a viable alternative to traditional metals. Compared to traditional metals, PEEK does not interfere with medical examinations such as X-rays and MRI, and is lightweight and high-strength. However, titanium's low tensile strength (approximately 265-390 MPa) makes it unsuitable for long-term oral chewing forces, and its elastic modulus mismatch with natural bone can lead to stress shielding issues, bone resorption, and the potential release of aluminum and vanadium ions from some titanium alloys (such as Ti-6Al-4V), potentially causing osteomalacia or neuropathy. Researchers have developed a high-performance hybrid composite laminate combining PEEK and titanium. This composite structure integrates the metallic properties of titanium with the biological advantages of PEEK, offering a superior solution for dental implants. Widely used in the medical industry, titanium metal suffers from low interfacial bonding strength with polyetheretherketone (PEEK), severely impacting material properties. Rare earth elements exhibit varying interfacial bonding properties with titanium. First-principles calculations reveal that lanthanum (La), cerium (Ce), neodymium (Nd), and samarium (Sm) have lower formation energies at the TiAl / Ti3Al grain boundaries than within the matrix, tending to segregate at these boundaries. Specifically, the G / B ratios for Ce replacing Al3 atoms and Sm replacing Ti3 atoms are both less than 0.5, which helps improve the interfacial ductility between titanium and rare earth metals, allowing the interface to undergo plastic deformation without fracturing under stress.

[0003] Rare earth element modified polyether ether ketone / titanium metal composites prepared by the traditional ultrasonic impregnation method mainly rely on physical adsorption, resulting in relatively poor strength and uniformity of the loaded layer. Summary of the Invention

[0004] This invention addresses the technical problem of poor interfacial bonding between polyetheretherketone (PEEK) and titanium by providing a method for preparing rare-earth metal-modified PEEK composite materials by laser sintering onto a titanium surface. This invention enables the formation of strong chemical and coordination bonds between cerium oxide and the PEEK surface, resulting in a uniform, stable, and highly active nanostructured composite coating. This significantly improves the interfacial bonding strength between titanium and PEEK. Compared to traditional ultrasonic impregnation, its mechanical properties are improved by 1.15 times.

[0005] To address the aforementioned technical problems, the present invention adopts the following technical solution: The purpose of this invention is to provide a method for preparing a rare-earth metal-modified polyetheretherketone composite material by laser sintering on a titanium metal surface, characterized by comprising the following steps: Step 1: Pour CeCl3 and urea into an ethanol-water solution and sonicate until completely dissolved to obtain a CeCl3 solution; Step 2: Immerse the hydroxylated polyether ether ketone in CeCl3 solution at room temperature, stir until homogeneous, heat to react, cool to room temperature, wash with anhydrous ethanol and deionized water in sequence, and dry to obtain cerium oxide modified polyether ether ketone powder. Step 3: Sandblast the surface of the titanium metal substrate, then ultrasonically clean it with anhydrous ethanol and deionized water in sequence, and let it air dry. Step 4: Place the titanium metal substrate processed in step 3 into the forming cavity of the additive manufacturing equipment. At the same time, cerium oxide modified polyether ether ketone powder is placed in the powder feeding cavity and formed using laser powder bed melting process under inert gas protection. After printing, heat preservation treatment is performed to complete the process.

[0006] Further specifying, in step 1, the volume concentration of the ethanol-water solution is 10-25%.

[0007] Further specifying, in step 1, the mass ratio of CeCl3 to urea is (1~5):(10~20).

[0008] Further specifying, the concentration of the CeCl3 solution obtained in step 1 is 0.5wt%~1wt%.

[0009] Further specifying, in step 2, the hydroxylated polyether ether ketone is prepared according to the following steps: dry PEEK and strong reducing agent sodium borohydride are uniformly poured into a dimethyl sulfoxide solution at a mass ratio of 1.5~5:1, reacted at 100~160℃ for 16~24h, cooled to room temperature, and the solid precipitate is washed successively with ethanol, hydrochloric acid solution and deionized water, and then vacuum dried at 80℃ for 24h to obtain the hydroxylated polyether ether ketone material.

[0010] Further specifying, in step 2, the reaction is carried out at a temperature of 200℃~260℃.

[0011] Further specifying step 3, sandblasting: use 60-mesh coarse sand to perform sandblasting treatment at a distance of 100 mm-150 mm from the surface of the titanium sheet, with a spraying pressure of 0.2 MPa and a duration of 20 s.

[0012] To further specify, in step 4, the inert gas is argon.

[0013] Further specifying the process, the pretreated titanium metal substrate is placed in the forming cavity of the additive manufacturing equipment and heated to 350~375℃ while maintaining a stable temperature. Simultaneously, the cerium oxide-modified PEEK powder is preheated to 120~160℃ in the powder feeding cavity, and a thin layer of metal powder is laid on the building platform. A laser beam scans and melts the powder according to the cross-sectional contour of the part, forming a molten pool and solidifying it. The building platform descends by one layer thickness, and the powder laying and scanning process is repeated until the part is completed.

[0014] Further specifying the process parameters for the laser powder bed melting process in step 4: laser power of 65-100W, scanning speed of 500-1400mm / s, scanning spacing of 60-120μm, powder thickness of 30-100μm, scanning strategy of strip scanning, strip width of 0.05-0.15mm, and rotation of the scanning vector direction between layers of 57°-90°.

[0015] Furthermore, the heat preservation time in step 4 is specified to be 2-4 hours to eliminate internal stress and improve bonding quality and product performance.

[0016] Another object of the present invention is to provide a rare earth metal modified polyether ether ketone composite material for titanium metal surface laser sintering prepared by any of the above methods.

[0017] This invention utilizes the interfacial chemical reaction between oxygen atoms on the cerium oxide surface and Ti atoms on the Ti metal surface to form Ti-O-Ce bonds, breaking the inert layers on both surfaces and constructing a chemical bond connection. Cerium oxide can also form a spinel structure (such as CeTiO4) with the natural oxide film (TiO2) on the Ti surface, eliminating the barrier effect of the interfacial oxide layer and transforming the interface from "physical contact" to "chemical fusion." This results in a uniform, stable, and highly active nanostructured composite coating, thereby improving the interfacial bonding strength between titanium metal and PEEK.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention relates to a method for preparing titanium-supported polyetheretherketone (PEEK) composite materials based on a rare-earth coordination method. First, PEEK is hydroxylated using a strong reducing agent. Then, cerium oxide-modified PEEK material is prepared via a solvothermal method. Finally, the resulting material is coated onto a titanium metal surface using laser sintering technology. In this process, cerium oxide acts as a rare-earth medium, and its cerium element has a unique outer electron configuration (4f...). 1 5d 1 6s 2It exhibits high chemical reactivity and readily reacts with the oxide layer (TiO2) on the surface of titanium metal to form Ce-O-Ti chemical bonds. Simultaneously, it can coordinate or charge-transfer with the ether bonds and carbonyl groups on the polyether ether ketone (PEEK) molecular chain. The formation of these chemical and coordination bonds effectively lowers the interfacial energy barrier, significantly enhancing the interfacial bonding force between PEEK and titanium metal.

[0019] This invention utilizes the rare earth element coordination principle to modify polyether ether ketone (PEEK) with rare earth element cerium, and combines it with titanium metal that has undergone surface sandblasting, thereby improving the interfacial bonding strength between titanium metal and PEEK.

[0020] This invention successfully prepared a polyetheretherketone / titanium metal composite material with excellent interfacial bonding performance by introducing the rare earth oxide cerium oxide and combining it with laser sintering. Compared with the system without rare earth materials, the mechanical properties of the composite material obtained by this method are improved by 3.45 times, demonstrating a significant interfacial reinforcement effect. Detailed Implementation

[0021] The present invention will be described in detail below with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but should not be considered as limiting the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention. Example 1: The preparation method of the rare earth metal modified polyether ether ketone composite material on the surface of titanium metal by laser sintering in this example is carried out according to the following steps: Step 1: Place 100g of polyetheretherketone powder into a vacuum drying oven and dry at 160℃ for 6 hours.

[0022] Step 2: 100g of dry PEEK and strong reducing agent sodium borohydride were uniformly poured into dimethyl sulfoxide solution at a mass ratio of 2:1. After reacting at 120℃ for 20h, the mixture was cooled to room temperature and washed with ethanol, hydrochloric acid solution and deionized water respectively. The solid precipitate was then dried under vacuum at 80℃ for 24h to obtain hydroxylated polyether ether ketone material. Step 3: Pour 3g of CeCl3 and urea mixture (CeCl3 to urea mass ratio of 1:2.25) into 600mL of ethanol aqueous solution (volume concentration of 20%) and disperse it by ultrasonic treatment until it is completely dissolved to obtain a 0.5wt% CeCl3 solution; then immerse the hydroxylated polyether ether ketone into the solution at room temperature and stir for 6h; then transfer the mixed solution to a stainless steel high-pressure reactor with a polytetrafluoroethylene liner and react at 260℃ for 48h, and cool to room temperature; after washing repeatedly with anhydrous ethanol and deionized water, place the product obtained from the reaction in an oven at 140℃ for 24h to obtain cerium oxide modified polyether ether ketone powder.

[0023] Step 4: Sandblast the titanium metal surface; use 60-mesh coarse sand to sandblast at a distance of 100 mm from the titanium sheet surface, with a spray pressure of 0.2 MPa for 20 seconds to increase the bonding force between the titanium metal and PEEK. Then place it in an ultrasonic cleaning device and clean it with anhydrous ethanol for 15 minutes, then with distilled water for 10 minutes, and finally dry it at room temperature for 120 minutes for later use.

[0024] Step 5: Place the pretreated titanium substrate from Step 4 into the forming cavity of the additive manufacturing equipment, heat it to 375°C and maintain a stable temperature; simultaneously, preheat the cerium oxide-modified PEEK powder to 140°C in the powder feeding cavity, and form it using a laser powder bed melting process under argon protection. A thin layer of metal powder is laid on the build platform, and the laser beam scans and melts the powder according to the cross-sectional contour of the part, forming a molten pool and solidifying it. The build platform is lowered by one layer thickness, and the powder laying and scanning process is repeated until the part is completed. After printing, the resulting composite material is subjected to heat preservation treatment for 4 hours to eliminate internal stress generated during the forming process, thereby obtaining an interface-bonded reinforced polyetheretherketone / titanium metal composite material, denoted as 3wt%Ce@HPT.

[0025] Process parameters of laser powder bed melting process: Laser power is 100W, scanning speed is 800mm / s, scanning spacing is 100μm, powder thickness is 50μm, scanning strategy is strip scanning, strip width is 0.05mm, and the scanning vector direction is rotated 75° between layers.

[0026] Example 2: The preparation method of the rare earth metal modified polyether ether ketone composite material on the surface of titanium metal by laser sintering in this example is carried out according to the following steps: Step 1: Place 100g of polyetheretherketone powder into a vacuum drying oven and dry at 160℃ for 6 hours; Step 2: Pour 100g of dry PEEK and strong reducing agent sodium borohydride into a dimethyl sulfoxide solution at a mass ratio of 2:1. After reacting at 120℃ for 20h, cool to room temperature and wash the solid precipitate with ethanol, hydrochloric acid solution and deionized water respectively. Dry under vacuum at 80℃ for 24h to obtain hydroxylated polyether ether ketone material; for later use. Step 3: Pour 1g of CeCl3 and urea mixture (CeCl3 to urea mass ratio of 1:2.25) into 200mL of ethanol aqueous solution (volume concentration 20%) and disperse by ultrasonic treatment until completely dissolved to obtain a 0.5wt% CeCl3 solution; then immerse the hydroxylated polyether ether ketone into the solution at room temperature and stir for 6h; then transfer the mixed solution to a stainless steel high-pressure reactor with a polytetrafluoroethylene liner and react at 260℃ for 48h, then cool to room temperature; wash repeatedly with anhydrous ethanol and deionized water, and then dry the product obtained from the reaction in an oven at 140℃ for 24h to obtain cerium oxide modified polyether ether ketone powder.

[0027] Step 4: Sandblast the titanium metal surface; use 60-mesh coarse sand to sandblast at a distance of 100 mm from the titanium sheet surface, with a spray pressure of 0.2 MPa for 20 seconds, to increase the bonding force between the titanium metal and PEEK. Then place it in an ultrasonic cleaning device and clean it with ethanol for 15 minutes and distilled water for 10 minutes in sequence. Finally, dry it at room temperature for 120 minutes for later use.

[0028] Step 5: Place the pretreated titanium substrate from Step 4 into the forming cavity of the additive manufacturing equipment, heat it to 375°C and maintain a stable temperature; simultaneously, preheat the cerium oxide-modified PEEK powder to 140°C in the powder feeding cavity, and form it using a laser powder bed melting process under argon protection. A thin layer of metal powder is laid on the build platform, and the laser beam scans and melts the powder according to the cross-sectional contour of the part, forming a molten pool and solidifying it. The build platform is lowered by one layer thickness, and the powder laying and scanning process is repeated until the part is completed. After printing, the resulting composite material is subjected to heat preservation treatment for 4 hours to eliminate internal stress generated during the forming process, thereby obtaining an interface-bonded reinforced polyetheretherketone / titanium metal composite material, denoted as 1wt%Ce@HPT.

[0029] Process parameters of laser powder bed melting process: Laser power is 100W, scanning speed is 800mm / s, scanning spacing is 100μm, powder thickness is 50μm, scanning strategy is strip scanning, strip width is 0.05mm, and the scanning vector direction is rotated 75° between layers.

[0030] Example 3: The preparation method of the rare earth metal modified polyether ether ketone composite material on the surface of titanium metal by laser sintering in this example is carried out according to the following steps: Step 1: Place 100g of polyetheretherketone powder into a vacuum drying oven and dry at 160℃ for 6 hours; Step 2: Pour 100g of dry PEEK and strong reducing agent sodium borohydride into a dimethyl sulfoxide solution at a mass ratio of 2:1. After reacting at 120℃ for 20h, cool to room temperature and wash the solid precipitate with ethanol, hydrochloric acid solution and deionized water respectively. Dry under vacuum at 80℃ for 24h to obtain hydroxylated polyether ether ketone material; for later use. Step 3: Pour 5g of CeCl3 and urea mixture (CeCl3 to urea mass ratio of 1:2.25) into 1000mL of ethanol aqueous solution (volume fraction of 20%) and disperse by ultrasonic treatment until completely dissolved to obtain a 0.5wt% CeCl3 solution; then immerse the hydroxylated polyether ether ketone into the solution at room temperature and stir for 6h; then transfer the mixed solution to a stainless steel high-pressure reactor with a polytetrafluoroethylene liner and react at 260℃ for 48h. After cooling to room temperature, wash repeatedly with anhydrous ethanol and deionized water, and then place the product obtained from the reaction in an oven at 140℃ for 24h to obtain cerium oxide modified sulfonated polyether ether ketone powder.

[0031] Step 4: Sandblast the titanium surface; use 60-mesh coarse sand to sandblast at a distance of 100 mm from the titanium sheet surface, with a spray pressure of 0.2 MPa for 20 seconds. This increases the bonding force between the titanium and PEEK. Then, place it in an ultrasonic cleaning device and clean it sequentially with ethanol for 15 minutes, then with distilled water for 10 minutes, and finally dry it at room temperature for 120 minutes for later use.

[0032] Step 5: Place the pretreated titanium substrate from Step 4 into the forming cavity of the additive manufacturing equipment, heat it to 375°C and maintain a stable temperature; simultaneously, preheat the cerium oxide-modified PEEK powder to 140°C in the powder feeding cavity, and form it using a laser powder bed melting process under argon protection. A thin layer of metal powder is laid on the build platform, and the laser beam scans and melts the powder according to the cross-sectional contour of the part, forming a molten pool and solidifying it. The build platform is lowered by one layer thickness, and the powder laying and scanning process is repeated until the part is completed. After printing, the resulting composite material is subjected to heat preservation treatment for 4 hours to eliminate internal stress generated during the forming process, thereby obtaining an interface-bonded reinforced polyetheretherketone / titanium metal composite material, denoted as 5wt%Ce@HPT.

[0033] Process parameters of laser powder bed melting process: Laser power is 100W, scanning speed is 800mm / s, scanning spacing is 100μm, powder thickness is 50μm, scanning strategy is strip scanning, strip width is 0.05mm, and the scanning vector direction is rotated 75° between layers.

[0034] Comparative Example 1 Step 1) Place 100g of polyetheretherketone powder into a vacuum drying oven and dry at 160℃ for 6 hours; Step 2) 100g of dry PEEK and strong reducing agent sodium borohydride were uniformly poured into dimethyl sulfoxide solution at a mass ratio of 2:1. After reacting at 120℃ for 20h, the mixture was cooled to room temperature and washed with ethanol, hydrochloric acid solution and deionized water respectively. The solid precipitate was then dried under vacuum at 80℃ for 24h to obtain hydroxylated polyether ether ketone material for later use. Step 3) Sandblast the titanium surface; use 60-mesh coarse sandblasting at a distance of 100 mm from the titanium sheet surface, with a spray pressure of 0.2 MPa for 20 seconds. Then place it in an ultrasonic cleaning device, clean with ethanol for 15 minutes, clean with distilled water for 10 minutes, and finally dry at room temperature for 120 minutes. Set aside for later use.

[0035] Step 4) Pour 3g of CeCl3 powder into anhydrous ethanol and disperse it using ultrasound until completely dissolved to obtain a 0.5wt% CeCl3 solution. Then, immerse Ti in the solution at room temperature for 2 h to allow CeCl3 to adsorb onto the titanium sheet. Rinse off excess solution with anhydrous ethanol, dry at 80 °C for 4 h, and then heat-treat at 300 °C for 30 min. Step 6) The treated titanium metal is placed in the additive manufacturing equipment forming cavity and heated to 375°C. Simultaneously, the obtained hydroxylated PEEK powder is preheated to 140°C and placed in the powder feeding cavity for laser sintering. After the experiment, a heat treatment is performed for 4 hours to eliminate internal stress and obtain the final material. This is denoted as 3wt%CeT@HP.

[0036] Comparative Example 2 Step 1) Place 100g of polyetheretherketone powder into a vacuum drying oven and dry at 160℃ for 6 hours; set aside for later use. Step 2) Sandblast the titanium surface; use 60-mesh coarse abrasive to sandblast at a distance of 100 mm from the titanium sheet surface, with a spray pressure of 0.2 MPa for 20 seconds. Then place it in an ultrasonic cleaning device, clean with ethanol for 15 minutes, clean with distilled water for 10 minutes, and finally dry at room temperature for 120 minutes. Set aside for later use.

[0037] Step 3) Pour 3g of CeCl3 powder into anhydrous ethanol and disperse it using ultrasound until completely dissolved to obtain a 0.5wt% CeCl3 solution. Then, immerse Ti in the solution at room temperature for 2 h to allow CeCl3 to adsorb onto the titanium sheet. Rinse off excess solution with anhydrous ethanol, dry at 80 °C for 4 h, and then heat-treat at 300 °C for 30 min. Step 4) The treated titanium metal is placed in the additive manufacturing equipment forming cavity and heated to 375°C. Simultaneously, the PEEK powder is preheated to 140°C and placed in the powder feeding cavity for laser sintering. After the experiment, a heat treatment is performed for 4 hours to eliminate internal stress and obtain the final material. This is denoted as 3wt%CeT@P.

[0038] Comparative Example 3 Step 1) Place 100g of polyetheretherketone powder into a vacuum drying oven and dry at 160℃ for 6 hours; Step 2) 100g of dry PEEK and strong reducing agent sodium borohydride were uniformly poured into dimethyl sulfoxide solution at a mass ratio of 2:1. After reacting at 120℃ for 20h, the mixture was cooled to room temperature and washed with ethanol, hydrochloric acid solution and deionized water respectively. The solid precipitate was then dried under vacuum at 80℃ for 24h to obtain hydroxylated polyether ether ketone material for later use. Step 3) Place titanium metal in the additive manufacturing equipment forming cavity and heat it to 375°C. Simultaneously, preheat the obtained hydroxylated PEEK powder to 140°C and place it in the powder feeding cavity for laser sintering. After the experiment, perform a heat treatment for 4 hours to eliminate internal stress and obtain the final material. This is denoted as T@HP.

[0039] The experimental results of Examples 1-3 and Comparative Examples 1-3 are shown in Table 1: Table 1

[0040] As shown in Table 1, the tensile strength and shear strength of the 3wt%Ce@HPT composite material are 4.31 MPa and 4.22 MPa, respectively, which are 1.15 and 1.19 times higher than those of the 3wt%CeT@HP composite material. The chemical bonding of cerium effectively enhances the bonding force between titanium and PEEK, playing a crucial role in the interfacial bonding between titanium and polyetheretherketone.

[0041] The specific embodiments of the present invention have been described in detail above. It should be noted that the present invention is not limited to the specific embodiments described above. Various modifications or alterations can be made by those skilled in the art without departing from the scope of protection defined by the claims, and all such modifications or alterations fall within the scope of the present invention.

Claims

1. A method for preparing a rare-earth metal-modified polyetheretherketone composite material with laser sintering on a titanium metal surface, characterized in that, Includes the following steps: Step 1: Pour CeCl3 and urea into an ethanol-water solution and sonicate until completely dissolved to obtain a CeCl3 solution; Step 2: Immerse the hydroxylated polyether ether ketone in CeCl3 solution at room temperature, stir until homogeneous, heat to react, cool to room temperature, wash with anhydrous ethanol and deionized water in sequence, and dry to obtain cerium oxide modified polyether ether ketone powder. Step 3: Sandblast the surface of the titanium metal substrate, then ultrasonically clean it with anhydrous ethanol and deionized water in sequence, and let it air dry. Step 4: Place the titanium metal substrate processed in step 3 into the forming cavity of the additive manufacturing equipment. At the same time, cerium oxide modified polyether ether ketone powder is placed in the powder feeding cavity and formed using laser powder bed melting process under inert gas protection. After printing, heat preservation treatment is performed to complete the process.

2. The method according to claim 1, characterized in that, In step 1, the volume concentration of the ethanol aqueous solution is 10-25%.

3. The method according to claim 1, characterized in that, In step 1, the mass ratio of CeCl3 to urea is (1~5):(10~20).

4. The method according to claim 1, characterized in that, The concentration of the CeCl3 solution is 0.5wt%~1wt%.

5. The method according to claim 1, characterized in that, Hydroxylated polyether ether ketone is prepared by the following steps: dry PEEK and strong reducing agent sodium borohydride are uniformly poured into a dimethyl sulfoxide solution at a mass ratio of 1.5~5:

1. After reacting at 100~160℃ for 16~24h, the mixture is cooled to room temperature and then washed with ethanol, hydrochloric acid solution and deionized water respectively. The solid precipitate is then dried under vacuum at 80℃ for 24h to obtain the hydroxylated polyether ether ketone material.

6. The method according to claim 1, characterized in that, In step 2, the reaction is carried out at a temperature of 200℃~260℃.

7. The method according to claim 1, characterized in that, Sandblasting: Use 60-mesh coarse sand to perform sandblasting at a distance of 100 mm-150 mm from the surface of the titanium sheet, with a spraying pressure of 0.2 MPa and a duration of 20 s.

8. The method according to claim 1, characterized in that, The inert gas is argon.

9. The method according to claim 1, characterized in that, The process parameters for laser powder bed melting are as follows: laser power is 65-100W, scanning speed is 500-1400mm / s, scanning spacing is 60-120μm, powder thickness is 30-100μm, scanning strategy is strip scanning, strip width is 0.05-0.15mm, and the scanning vector direction is rotated 57°-90° between layers.

10. A rare earth metal modified polyether ether ketone composite material with laser sintered titanium metal surface prepared by the method of any one of claims 1-9.

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