Wear-resistant and corrosion-resistant laser cladding powder and preparation method thereof

Abstract

The invention relates to the field of laser cladding powder, in particular to wear-resistant and corrosion-resistant laser cladding powder and a preparation method thereof. The laser cladding powder is used for solving the problem that a cladding layer formed by existing laser cladding powder is poor in abrasion resistance and corrosion resistance. According to the laser cladding powder, the carbon nano tube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder are added, and the carbon nano tube and the lanthanum-yttrium oxide have a synergistic effect to refine grains, so that the corrosion resistance of a cladding layer is improved, and the carbon nano tube has good wear resistance; after the surface of the titanium diboride powder is coated with the copolymer, the dispersity of the titanium diboride is improved, a product decomposed by the copolymer reacts with the titanium diboride under the action of laser to generate titanium carbide, and the wear resistance of a cladding layer is enhanced; the laser cladding powder is suitable for prolonging the service cycle of a mold, can be used for surface strengthening of mine equipment parts, enhances the wear resistance and corrosion resistance of the mine equipment parts, reduces the maintenance frequency of the equipment, and can provide an effective solution for surface strengthening of parts in various industrial fields.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of laser cladding powder, and particularly relates to a laser cladding powder with wear resistance and corrosion resistance and a preparation method thereof. BACKGROUND

[0002] The laser cladding technology is a surface modification technology that melts and solidifies a cladding material and a substrate surface rapidly by a high-energy laser beam to form a cladding layer that is metallurgically combined with the substrate. The technology can significantly improve the wear resistance, corrosion resistance and high-temperature resistance of the surface of a part, thereby prolonging the service life of the part and being widely applied in the fields of aerospace, petrochemical industry, automobile manufacturing and mold processing. The existing powder still has some deficiencies in use. The self-fluxing alloy powder has good wettability and weldability, but the wear resistance and corrosion resistance are relatively poor. The ceramic powder has high hardness and wear resistance, but is brittle and has low bonding strength with the substrate, which limits its application range. The present application provides a laser cladding powder with wear resistance and corrosion resistance, which has excellent wear resistance and corrosion resistance and can significantly improve the service life of the cladding layer and is suitable for surface strengthening of parts in various industrial fields. SUMMARY

[0003] In order to overcome the above technical problems, the present application aims to provide a laser cladding powder with wear resistance and corrosion resistance and a preparation method thereof, which solves the problem that the cladding layer formed by the existing laser cladding powder has relatively poor wear resistance and corrosion resistance in a high-temperature and highly corrosive environment.

[0004] The object of the present application can be achieved by the following technical solutions. In a first aspect, the present application provides a laser cladding powder with wear resistance and corrosion resistance, which comprises the following components by weight: Al 0.7 CoCrFeNi 2.1 20-40 parts of high-entropy alloy, 5-10 parts of tungsten powder, 8-16 parts of zirconium powder, 11-22 parts of niobium powder, 5-10 parts of carbon nanotube loaded lanthanum-yttrium oxide powder and 5-10 parts of copolymer coated titanium diboride powder; The carbon nanotube loaded lanthanum-yttrium oxide powder is prepared by the following steps: Step A1: carbon nanotubes and N,N-dimethylformamide are added to a single-neck flask, ultrasonic dispersion is performed for 5-10 min, lanthanum nitrate solution is added, ultrasonic dispersion is performed for 5-10 min, the single-neck flask is transferred to a heating table, stirring is performed at 80-90℃ for 3-4 h, cooling is performed to 24-26℃, centrifugation is performed, ethanol washing is performed for 3 times, and vacuum drying is performed at 70-80℃ for 30-40 min in a drying box to obtain lanthanum hydroxide-carbon nanotube composite powder; Step A2: Put the lanthanum hydroxide-carbon nanotube composite powder into a tube furnace, protect by passing in argon, react at 200-300℃ for 1h, to obtain lanthanum oxide-carbon nanotube composite carrier powder; Step A3: Put the lanthanum oxide-carbon nanotube composite carrier powder, deionized water into a single-necked flask, ultrasonic dispersion for 20-30min, add yttrium chloride, ultrasonic dispersion for 20-30min, transfer the single-necked flask to a heating table, add ethylene glycol, stir at 230-240℃ for 5-10min, cool to 24-26℃, centrifugal, wash with deionized water, freeze-drying, to obtain carbon nanotube loaded lanthanum oxide-yttrium powder.

[0005] As a further scheme of the present application: the amount ratio of the carbon nanotube, N,N-dimethylformamide and lanthanum nitrate solution in step A1 is 8-16mg:16-32mL:3.2-6.4mL.

[0006] As a further scheme of the present application: the molar concentration of the lanthanum nitrate solution in step A1 is 0.2mol / L.

[0007] As a further scheme of the present application: the amount ratio of the lanthanum oxide-carbon nanotube composite carrier powder, deionized water, yttrium chloride and ethylene glycol in step A3 is 10-20mg:4-8mL:0.024-0.048mmol:5-10mL.

[0008] As a further scheme of the present application: the copolymer wrapped titanium diboride powder is prepared by the following steps: Step B1: Put chitosan, acetic acid solution into a three-necked flask equipped with a stirrer and a thermometer, drop in sodium alginate solution, add calcium chloride, stir at 50-60℃ for 3-4h, wash with deionized water for 3-5 times, freeze-drying, crush to obtain chitosan-sodium alginate copolymer powder; Step B2: Put chitosan-sodium alginate copolymer powder, acetic acid solution into a three-necked flask equipped with a stirrer and a thermometer, drop in tetrabutyl titanate mixed with ethanol into the three-necked flask, stir at 200-300r / min for 20-30min, add deionized water, heat to 30-40℃, react for 2-3h, after the reaction, pour the mixture into a mold, stand for 12-14h, soak in deionized water for 22-24h, freeze-drying at-80℃, to obtain Ti-chitosan-sodium alginate copolymer powder; Step B3: Put titanium diboride, Ti-chitosan-sodium alginate copolymer powder, deionized water and polyvinylpyrrolidone into a three-necked flask equipped with a stirrer, mix at 20-30r / min for 1-2h, spray-drying to obtain copolymer wrapped titanium diboride powder.

[0009] As a further scheme of the present application: the dosage ratio of the chitosan, acetic acid solution, sodium alginate solution and calcium chloride in step B1 is 100-200 mg: 100-200 mL: 100-200 mL: 5-10 g.

[0010] As a further scheme of the present application: the deacetylation degree of the chitosan in step B1 is 85%.

[0011] As a further scheme of the present application: the mass fraction of the acetic acid solution in step B1 is 2%.

[0012] As a further scheme of the present application: the concentration of the sodium alginate solution in step B1 is 1 mg / mL.

[0013] As a further scheme of the present application: the dosage ratio of the chitosan-sodium alginate copolymer powder, acetic acid solution, tetrabutyl titanate, ethanol and deionized water in step B2 is 5-10 g: 100-200 mL: 1-2 g: 20-40 mL: 0.1-0.2 mL.

[0014] As a further scheme of the present application: the mass fraction of the acetic acid solution in step B2 is 1%.

[0015] As a further scheme of the present application: the dosage ratio of the titanium diboride, Ti-chitosan-sodium alginate copolymer powder, deionized water and polyvinylpyrrolidone in step B3 is 23.75-47.5 g: 1.25-2.5 g: 50-100 mL: 0.05-0.1 g.

[0016] As a further scheme of the present application: the model of the polyvinylpyrrolidone in step B3 is PVP-K17.

[0017] In a second aspect, the present application provides a preparation method of a wear-resistant and corrosion-resistant laser cladding powder, comprising the following steps: Step one: Al 0.7 CoCrFeNi 2.1 High-entropy alloy 20-40 parts, tungsten powder 5-10 parts, zirconium powder 8-16 parts, niobium powder 11-22 parts, carbon nanotube loaded lanthanum-yttrium oxide powder 5-10 parts and copolymer wrapped titanium diboride powder 5-10 parts; Step two: Al 0.7 CoCrFeNi 2.1 High-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotube loaded lanthanum-yttrium oxide powder and copolymer wrapped titanium diboride powder are added to a planetary ball mill, argon gas is introduced for protection, and the laser cladding powder is obtained by ball milling.

[0018] The present application has the following advantages: The application discloses a wear-resistant and corrosion-resistant laser cladding powder and a preparation method thereof. 0.7 CoCrFeNi 2.1 The tungsten powder, the zirconium powder and the niobium powder are added into the high-entropy alloy to improve the hardness and wear resistance of the laser cladding powder; the rare earth element is loaded on the carbon nanotube to improve the corrosion resistance of the laser cladding powder; the titanium tetrabutoxide is grafted on the chitosan-sodium alginate copolymer to improve the compatibility with titanium diboride, and the titanium diboride is wrapped on the surface of the titanium diboride, so that the titanium diboride refiner and the chitosan-sodium alginate copolymer are efficiently cooperated, and the grain refinement effect is significantly improved; under the action of laser, the Al 0.7 CoCrFeNi 2.1 The high-entropy alloy, the tungsten powder, the zirconium powder and the niobium powder are fused to form a cladding layer; the carbon nanotube loaded lanthanum-yttrium oxide powder improves the compactness of the surface of the cladding layer; the copolymer wraps the titanium diboride powder, and the copolymer is decomposed to form CO2, H2O and other substances; the residual carbon reacts with the titanium diboride to generate boron carbide, the interface bonding between the cladding layer and the metal matrix is enhanced, the stability of the cladding layer is improved, the stable operation of mechanical parts under various harsh working conditions can be ensured, and the laser cladding powder can be widely applied to the fields of navigation and petrochemical industry.

[0019] The application discloses a kind of wear-resistant corrosion-resistant laser cladding powder, first prepare carbon nanotube supported lanthanum oxide-yttrium powder, carbon nanotube is supported by lanthanum hydroxide by the reaction of carbon nanotube and lanthanum nitrate solution, lanthanum hydroxide is generated lanthanum oxide at high temperature, obtain lanthanum oxide-carbon nanotube composite carrier powder, by the reaction of lanthanum oxide-carbon nanotube composite carrier powder and yttrium chloride, carbon nanotube supported lanthanum oxide-yttrium powder is obtained, rare earth elements have good purification effect, can effectively remove impurity elements in alloy, improve the compactness and chemical stability of cladding layer, carbon nanotube has good wear resistance, and carbon nanotube is added to refine grain by synergistic effect, solve the problem of traditional rare earth elements easy to agglomerate, improve the corrosion resistance of cladding layer, obtain Ti-chitosan-sodium alginate copolymer by polymerizing and grafting tetrabutyl titanate to chitosan and sodium alginate, improve the compatibility with titanium diboride, titanium diboride is mixed with Ti-chitosan-sodium alginate copolymer, and the copolymer is wrapped on the surface of titanium diboride, titanium diboride itself is a grain refiner, after the surface is wrapped with copolymer, the dispersibility and high-temperature stability of titanium diboride grain refiner are significantly improved, the copolymer decomposes to form CO2, H2O and other substances at high temperature, the residual carbon reacts with titanium diboride to generate boron carbide, enhances the interface bonding of cladding layer and metal matrix, and improves the wear resistance of cladding layer;The laser cladding powder is melted and rapidly diffused under the action of laser, and a cladding layer is formed on the surface of the substrate, the cladding layer has excellent wear resistance and corrosion resistance, and can be applied to the surface treatment of key parts such as automobile engine, to improve the wear resistance and service life of the parts, and is suitable for surface protection of petroleum pipeline and other equipment, to enhance the corrosion resistance and wear resistance of the equipment, and reduce equipment failure caused by corrosion and wear. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to facilitate those skilled in the art to understand, the application will be further described below with reference to the drawings.

[0021] Figure 1 The wear resistance test results of examples 1-3 and comparative examples 1-3 of the application are shown in the figure. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the application will be described below in detail with reference to the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, not all. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the application.

[0023] Example 1: The embodiment is a preparation method of a wear-resistant corrosion-resistant laser cladding powder, comprising the following steps: Step S1: 8 mg of carbon nanotubes, 16 mL of N, N-dimethylformamide were added to a single-necked flask, ultrasonic dispersion for 5 min, 3.2 mL of lanthanum nitrate solution was added, ultrasonic dispersion for 5 min, the single-necked flask was transferred to a heating table, stirring at 80℃ for 3h, cooling to 24℃, centrifugation, washing with ethanol for 3 times, placing in a drying box for vacuum drying at 70℃ for 30 min, to obtain lanthanum hydroxide-carbon nanotube composite powder; Step S2: The lanthanum hydroxide-carbon nanotube composite powder was placed in a tube furnace, argon was introduced for protection, and reaction was carried out at 200℃ for 1h to obtain lanthanum oxide-carbon nanotube composite carrier powder; Step S3: 10 mg of lanthanum oxide-carbon nanotube composite carrier powder, 4 mL of deionized water were added to a single-necked flask, ultrasonic dispersion for 20 min, 0.024 mmol of yttrium chloride was added, ultrasonic dispersion for 20 min, the single-necked flask was transferred to a heating table, 5 mL of ethylene glycol was added, stirring at 230℃ for 5 min, cooling to 24℃, centrifugation, washing with deionized water, freeze-drying to obtain carbon nanotube supported lanthanum oxide-yttrium powder; Step S4: 100 mg of chitosan, 100 mL of acetic acid solution were added to a three-necked flask equipped with a stirrer and a thermometer, 100 mL of sodium alginate solution was added dropwise, 5 g of calcium chloride was added, stirring at 50℃ for 3h, washing with deionized water for 3 times, freeze-drying, and then crushing to obtain chitosan-sodium alginate copolymer powder; Step S5: 5 g of chitosan-sodium alginate copolymer powder, 100 mL of acetic acid solution were added to a three-necked flask equipped with a stirrer and a thermometer, 1 g of tetrabutyl titanate was mixed with 20 mL of ethanol and added dropwise to the three-necked flask, stirring at 200 r / min for 20 min, 5 mL of deionized water was added, and the temperature was raised to 30℃, and the reaction was carried out for 2h, after the reaction was completed, the mixture was added to a mold, and was placed for 12h, soaked in deionized water for 22h, and freeze-dried at -80℃ to obtain Ti-chitosan-sodium alginate copolymer powder; Step S6: 23.75 g of titanium diboride, 1.25 g of Ti-chitosan-sodium alginate copolymer powder, 50 mL of deionized water, and 0.05 g of polyvinylpyrrolidone were added to a three-necked flask equipped with a stirrer, mixed at 20 r / min for 1h, and spray-dried to obtain copolymer-coated titanium diboride powder; Step S7: Al 0.7 CoCrFeNi 2.1 High-entropy alloy 20 parts, tungsten powder 5 parts, zirconium powder 8 parts, niobium powder 11 parts, carbon nanotube supported lanthanum oxide-yttrium powder 5 parts, and copolymer-coated titanium diboride powder 5 parts; Step S8: Al 0.7 CoCrFeNi 2.1The high-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotube loaded lanthanum oxide-yttrium powder and copolymer wrapped titanium diboride powder are added into a planetary ball mill, argon gas is introduced for protection, and laser cladding powder is obtained by ball milling.

[0024] Embodiment 2: The embodiment is a preparation method of a wear-resistant and corrosion-resistant laser cladding powder, which comprises the following steps: Step S1: 12 mg of carbon nanotubes and 24 mL of N, N-dimethylformamide are added into a single-neck flask, ultrasonic dispersion is performed for 7 min, 4.8 mL of lanthanum nitrate solution is added, ultrasonic dispersion is performed for 7 min, the single-neck flask is transferred to a heating table, stirring is performed at 85°C for 3.5 h, cooling is performed to 25°C, centrifugation is performed, ethanol washing is performed for 3 times, and vacuum drying is performed at 75°C for 35 min in a drying box to obtain lanthanum hydroxide-carbon nanotube composite powder; Step S2: The lanthanum hydroxide-carbon nanotube composite powder is placed into a tube furnace, argon gas is introduced for protection, and reaction is performed at 250°C for 1 h to obtain lanthanum oxide-carbon nanotube composite carrier powder; Step S3: 15 mg of lanthanum oxide-carbon nanotube composite carrier powder and 6 mL of deionized water are added into a single-neck flask, ultrasonic dispersion is performed for 25 min, 0.036 mmol of yttrium chloride is added, ultrasonic dispersion is performed for 25 min, the single-neck flask is transferred to a heating table, 7.5 mL of ethylene glycol is added, stirring is performed at 235°C for 7 min, cooling is performed to 25°C, centrifugation is performed, deionized water washing is performed, and freeze drying is performed to obtain carbon nanotube loaded lanthanum oxide-yttrium powder; Step S4: 150 mg of chitosan and 150 mL of acetic acid solution are added into a three-neck flask provided with a stirrer and a thermometer, 150 mL of sodium alginate solution is added dropwise, 7.5 g of calcium chloride is added, stirring is performed at 55°C for 3.5 h, deionized water washing is performed for 4 times, and freeze drying is performed to obtain chitosan-sodium alginate copolymer powder after crushing; Step S5: 7.5 g of chitosan-sodium alginate copolymer powder and 150 mL of acetic acid solution are added into a three-neck flask provided with a stirrer and a thermometer, 1.5 g of tetrabutyl titanate is mixed with 30 mL of ethanol and added dropwise into the three-neck flask, stirring is performed at 250 r / min for 25 min, 7 mL of deionized water is added, the temperature is increased to 35°C, reaction is performed for 2.5 h, after the reaction is completed, the mixture is added into a mold, standing is performed for 13 h, deionized water soaking is performed for 23 h, and freeze drying is performed at-80°C to obtain Ti-chitosan-sodium alginate copolymer powder; Step S6: 35.63 g of titanium diboride, 1.875 g of Ti-chitosan-sodium alginate copolymer powder, 75 mL of deionized water and 0.075 g of polyvinylpyrrolidone are added into a three-neck flask provided with a stirrer, mixing is performed at 25 r / min for 1.5 h, and spray drying is performed to obtain copolymer wrapped titanium diboride powder. Step S7: Al was weighed according to parts by weight 0.7 CoCrFeNi 2.1 high-entropy alloy 30 parts, tungsten powder 7.5 parts, zirconium powder 12 parts, niobium powder 16.5 parts, carbon nanotube loaded lanthanum-yttrium oxide powder 7.5 parts, and copolymer coated titanium diboride powder 7.5 parts; Step S8: Al was weighed according to parts by weight 0.7 CoCrFeNi 2.1 high-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotube loaded lanthanum-yttrium oxide powder, and copolymer coated titanium diboride powder were added to a planetary ball mill, argon was introduced for protection, and laser cladding powder was obtained by ball milling.

[0025] Example 3: The present embodiment is a preparation method of a wear-resistant and corrosion-resistant laser cladding powder, comprising the following steps: Step S1: 16 mg of carbon nanotubes and 32 mL of N, N-dimethylformamide were added to a single-neck flask and ultrasonically dispersed for 10 min. 6.4 mL of lanthanum nitrate solution was added and ultrasonically dispersed for 10 min. The single-neck flask was transferred to a heating table and stirred at 90°C for 4 h. It was cooled to 26°C, centrifuged, washed with ethanol 3 times, and placed in a drying box for vacuum drying at 80°C for 40 min to obtain lanthanum hydroxide-carbon nanotube composite powder; Step S2: The lanthanum hydroxide-carbon nanotube composite powder was placed in a tube furnace, argon was introduced for protection, and reacted at 300°C for 1 h to obtain lanthanum oxide-carbon nanotube composite carrier powder; Step S3: 20 mg of lanthanum oxide-carbon nanotube composite carrier powder and 8 mL of deionized water were added to a single-neck flask and ultrasonically dispersed for 30 min. 0.048 mmol of yttrium chloride was added and ultrasonically dispersed for 30 min. The single-neck flask was transferred to a heating table, 10 mL of ethylene glycol was added, and stirred at 240°C for 10 min. It was cooled to 26°C, centrifuged, washed with deionized water, and freeze-dried to obtain carbon nanotube loaded lanthanum-yttrium oxide powder; Step S4: 200 mg of chitosan and 200 mL of acetic acid solution were added to a three-neck flask equipped with a stirrer and a thermometer. 200 mL of sodium alginate solution was added dropwise, 10 g of calcium chloride was added, and stirred at 60°C for 4 h. It was washed with deionized water 5 times, freeze-dried, and crushed to obtain chitosan-sodium alginate copolymer powder; Step S5: 10 g of chitosan-sodium alginate copolymer powder, 200 mL of acetic acid solution were added to a three-necked flask equipped with a stirrer and a thermometer, 2 g of tetrabutyl titanate was mixed with 40 mL of ethanol and added dropwise to the three-necked flask, stirred at 300 r / min for 30 min, 10 mL of deionized water was added, and the temperature was raised to 40℃, and the reaction was carried out for 3 h. After the reaction was completed, the mixture was added to a mold, and after standing for 14 h, it was soaked in deionized water for 24 h, and then freeze-dried at -80℃ to obtain Ti-chitosan-sodium alginate copolymer powder; Step S6: 47.5 g of titanium diboride, 2.5 g of Ti-chitosan-sodium alginate copolymer powder, 100 mL of deionized water, and 0.1 g of polyvinylpyrrolidone were added to a three-necked flask equipped with a stirrer, and mixed at 30 r / min for 2 h, and then spray dried to obtain copolymer-coated titanium diboride powder; Step S7: Al 0.7 CoCrFeNi 2.1 High-entropy alloy 40 parts, tungsten powder 10 parts, zirconium powder 16 parts, niobium powder 22 parts, carbon nanotube loaded lanthanum-yttrium oxide powder 10 parts, and copolymer-coated titanium diboride powder 10 parts; Step S8: Al 0.7 CoCrFeNi 2.1 High-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotube loaded lanthanum-yttrium oxide powder, and copolymer-coated titanium diboride powder were added to a planetary ball mill, and argon was introduced for protection, and then ball milled to obtain laser cladding powder.

[0026] Comparative Example 1: The present comparative example is a method for preparing a wear-resistant and corrosion-resistant laser cladding powder, comprising the following steps: Step S1: 200 mg of chitosan, 200 mL of acetic acid solution were added to a three-necked flask equipped with a stirrer and a thermometer, 200 mL of sodium alginate solution was added dropwise, 10 g of calcium chloride was added, and stirred at 60℃ for 4 h, washed with deionized water for 5 times, freeze-dried, and then crushed to obtain chitosan-sodium alginate copolymer powder; Step S2: 10 g of chitosan-sodium alginate copolymer powder, 200 mL of acetic acid solution were added to a three-necked flask equipped with a stirrer and a thermometer, 2 g of tetrabutyl titanate was mixed with 40 mL of ethanol and added dropwise to the three-necked flask, stirred at 300 r / min for 30 min, 10 mL of deionized water was added, and the temperature was raised to 40℃, and the reaction was carried out for 3 h. After the reaction was completed, the mixture was added to a mold, and after standing for 14 h, it was soaked in deionized water for 24 h, and then freeze-dried at -80℃ to obtain Ti-chitosan-sodium alginate copolymer powder; Step S3: 47.5 g of titanium diboride, 2.5 g of Ti-chitosan-sodium alginate copolymer powder, 100 mL of deionized water, and 0.1 g of polyvinylpyrrolidone were added to a three-necked flask equipped with a stirrer, mixed at 30 r / min for 2 h, and spray dried to obtain copolymer-coated titanium diboride powder; Step S4: Al 0.7 CoCrFeNi 2.1 High-entropy alloy 40 parts, tungsten powder 10 parts, zirconium powder 16 parts, niobium powder 22 parts, carbon nanotubes 10 parts, and copolymer-coated titanium diboride powder 10 parts; Step S5: Al 0.7 CoCrFeNi 2.1 High-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotubes, and copolymer-coated titanium diboride powder were added to a planetary ball mill, argon was introduced for protection, and ball milling was performed to obtain laser cladding powder.

[0027] Comparative Example 2: The present comparative example is a method for preparing a wear-resistant and corrosion-resistant laser cladding powder, comprising the following steps: Step S1: 16 mg of carbon nanotubes and 32 mL of N, N-dimethylformamide were added to a single-necked flask and ultrasonically dispersed for 10 min. 6.4 mL of lanthanum nitrate solution was added and ultrasonically dispersed for 10 min. The single-necked flask was transferred to a heating table and stirred at 90°C for 4 h. It was cooled to 26°C, centrifuged, washed with ethanol three times, and placed in a drying box for vacuum drying at 80°C for 40 min to obtain lanthanum hydroxide-carbon nanotube composite powder; Step S2: The lanthanum hydroxide-carbon nanotube composite powder was placed in a tube furnace, argon was introduced for protection, and reaction was carried out at 300°C for 1 h to obtain lanthanum oxide-carbon nanotube composite carrier powder; Step S3: 20 mg of lanthanum oxide-carbon nanotube composite carrier powder and 8 mL of deionized water were added to a single-necked flask and ultrasonically dispersed for 30 min. 0.048 mmol of yttrium chloride was added and ultrasonically dispersed for 30 min. The single-necked flask was transferred to a heating table, 10 mL of ethylene glycol was added, and stirring was carried out at 240°C for 10 min. It was cooled to 26°C, centrifuged, washed with deionized water, and freeze-dried to obtain carbon nanotube-supported lanthanum oxide-yttrium powder; Step S4: Al 0.7 CoCrFeNi 2.1 High-entropy alloy 40 parts, tungsten powder 10 parts, zirconium powder 16 parts, niobium powder 22 parts, carbon nanotube-supported lanthanum oxide-yttrium powder 10 parts, and titanium diboride powder 10 parts; Step S5: Al 0.7 CoCrFeNi 2.1High-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotube-supported lanthanum-yttrium oxide powder, and titanium diboride powder are added to a planetary ball mill, protected by argon gas, and ball milled to obtain laser cladding powder.

[0028] Comparative Example 3: This comparative example illustrates a method for preparing a wear-resistant and corrosion-resistant laser cladding powder, comprising the following steps: Step S1: Weigh Al according to the weight percentage. 0.7 CoCrFeNi 2.1 40 parts of high-entropy alloy, 10 parts of tungsten powder, 16 parts of zirconium powder, 22 parts of niobium powder, 10 parts of carbon nanotubes, and 10 parts of titanium diboride powder; Step S2: Place Al 0.7 CoCrFeNi 2.1 High-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotubes, and titanium diboride powder are added to a planetary ball mill, protected by argon gas, and ball milled to obtain laser cladding powder.

[0029] Performance testing The laser cladding powders from Examples 1-3 and Comparative Examples 1-3 were directly placed in a powder feeder, using argon as a protective gas. The laser power was 800W, the scanning rate was 16mm / s, the defocusing distance was 35mm, the overlap rate was 30%, and the protective gas flow rate was 15L / min. After cladding was completed, surface oxides and other impurities were cleaned, and then the powders were cut into 10×10×6mm pieces using wire cutting. 3 15×15×6mm 3 The samples were ground and polished before use.

[0030] The friction and wear properties of the cladding layer were tested using a reciprocating wear tester (HSR-2M) to obtain the wear volume. The test results are as follows: Figure 1 As shown.

[0031] The cladding layer was electrochemically tested at room temperature using an electrochemical workstation (Interface1000) in a 3.5 wt% sodium chloride solution. The test results are shown in the table below:

[0032] See Figure 1 As shown in the table above, a comparison between Examples 1-3 and Comparative Examples 1-3 shows that adding carbon nanotube-loaded lanthanum oxide-yttrium powder and copolymer-coated titanium diboride powder to the laser cladding powder can improve the wear resistance and corrosion resistance of the cladding layer.

[0033] According to the comparison between Example 3 and Comparative Example 1, it can be seen that the wear resistance and corrosion resistance of the cladding layer prepared by adding the carbon nanotube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder into the laser cladding powder are better than those of the cladding layer prepared by adding the carbon nanotube powder and the copolymer coated titanium diboride powder into the laser cladding powder, which indicates that the carbon nanotube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder have excellent wear resistance and corrosion resistance. According to the comparison between Example 3 and Comparative Example 2, it can be seen that the wear resistance and corrosion resistance of the cladding layer prepared by adding the carbon nanotube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder into the laser cladding powder are better than those of the cladding layer prepared by adding the carbon nanotube loaded lanthanum-yttrium oxide powder and the titanium diboride powder into the laser cladding powder, which indicates that the carbon nanotube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder have excellent wear resistance and corrosion resistance. According to the comparison between Example 3 and Comparative Example 3, it can be seen that the wear resistance and corrosion resistance of the cladding layer prepared by adding the carbon nanotube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder into the laser cladding powder are better than those of the cladding layer prepared by adding the carbon nanotube powder and the titanium diboride powder into the laser cladding powder, which indicates that the carbon nanotube loaded lanthanum-yttrium oxide powder and the copolymer coated titanium diboride powder have excellent wear resistance and corrosion resistance. In the description of the present specification, the description referring to the terms "one embodiment", "an example", "a specific example" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0034] The above is only an example and description of the present application, and those skilled in the art can make various modifications or supplements or use similar ways to replace the described specific embodiments, as long as they do not deviate from the invention or exceed the scope defined in the present application, which shall be within the protection scope of the present application.

Claims

1. A wear-resistant and corrosion-resistant laser cladding powder, characterized in that, Includes the following components by weight: Al 0.7 CoCrFeNi 2.1 20-40 parts of high-entropy alloy, 5-10 parts of tungsten powder, 8-16 parts of zirconium powder, 11-22 parts of niobium powder, 5-10 parts of carbon nanotube-supported lanthanum oxide-yttrium powder, and 5-10 parts of copolymer-coated titanium diboride powder; The carbon nanotube-supported lanthanum oxide-yttrium powder is prepared by the following steps: Step A1: Add carbon nanotubes and N,N-dimethylformamide to a single-necked flask, disperse by ultrasonication, add lanthanum nitrate solution and disperse by ultrasonication, transfer the single-necked flask to a heating table for stirring, cool and centrifuge, wash with ethanol, and vacuum dry to obtain lanthanum hydroxide-carbon nanotube composite powder. Step A2: Place the lanthanum hydroxide-carbon nanotube composite powder into a tube furnace and introduce argon gas to react, thereby obtaining lanthanum oxide-carbon nanotube composite carrier powder. Step A3: Add lanthanum oxide-carbon nanotube composite carrier powder and deionized water to a single-necked flask, disperse by ultrasonication, add yttrium chloride and disperse by ultrasonication, transfer the single-necked flask to a heating stage, add ethylene glycol and stir, cool and centrifuge, wash with deionized water, freeze dry to obtain carbon nanotube-supported lanthanum oxide-yttrium powder.

2. The wear-resistant and corrosion-resistant laser cladding powder according to claim 1, characterized in that, In step A1, the ratio of carbon nanotubes, N,N-dimethylformamide, and lanthanum nitrate solution is 8-16 mg: 16-32 mL: 3.2-6.4 mL; the molar concentration of the lanthanum nitrate solution is 0.2 mol / L.

3. The wear-resistant and corrosion-resistant laser cladding powder according to claim 1, characterized in that, In step A3, the ratio of lanthanum oxide-carbon nanotube composite carrier powder, deionized water, yttrium chloride, and ethylene glycol is 10-20 mg: 4-8 mL: 0.024-0.048 mmol: 5-10 mL.

4. The wear-resistant and corrosion-resistant laser cladding powder according to claim 1, characterized in that, The copolymer-encapsulated titanium diboride powder was prepared by the following steps: Step B1: Add chitosan and acetic acid solution to a three-necked flask, add sodium alginate solution dropwise, add calcium chloride and stir, wash with deionized water, freeze dry, and pulverize to obtain chitosan-sodium alginate copolymer powder; Step B2: Chitosan-sodium alginate copolymer powder and acetic acid solution are added to a three-necked flask. Tetrabutyl titanate and ethanol are mixed and added dropwise to the three-necked flask and stirred. Deionized water is added and the mixture is heated to react. After the reaction is completed, the mixture is added to a mold, allowed to stand, soaked in deionized water, and freeze-dried to obtain Ti-chitosan-sodium alginate copolymer powder. Step B3: Add titanium diboride, Ti-chitosan-sodium alginate copolymer powder, deionized water and polyvinylpyrrolidone to a three-necked flask and mix. Spray dry to obtain copolymer-coated titanium diboride powder.

5. The wear-resistant and corrosion-resistant laser cladding powder according to claim 4, characterized in that, In step B1, the ratio of chitosan, acetic acid solution, sodium alginate solution, and calcium chloride is 100-200 mg: 100-200 mL: 100-200 mL: 5-10 g; the degree of deacetylation of chitosan is 85%; the mass fraction of acetic acid solution is 2%; and the concentration of sodium alginate solution is 1 mg / mL.

6. The wear-resistant and corrosion-resistant laser cladding powder according to claim 4, characterized in that, In step B2, the ratio of chitosan-sodium alginate copolymer powder, acetic acid solution, tetrabutyl titanate, ethanol, and deionized water is 5-10g: 100-200mL: 1-2g: 20-40mL: 0.1-0.2mL; the mass fraction of the acetic acid solution is 1%.

7. The wear-resistant and corrosion-resistant laser cladding powder according to claim 4, characterized in that, In step B3, the ratio of titanium diboride, Ti-chitosan-sodium alginate copolymer powder, deionized water, and polyvinylpyrrolidone is 23.75-47.5g: 1.25-2.5g: 50-100mL: 0.05-0.1g; the polyvinylpyrrolidone is of type PVP-K17.

8. A method for preparing a wear-resistant and corrosion-resistant laser cladding powder, characterized in that, Includes the following steps: Step 1: Weigh Al according to the weight percentage. 0.7 CoCrFeNi 2.1 20-40 parts of high-entropy alloy, 5-10 parts of tungsten powder, 8-16 parts of zirconium powder, 11-22 parts of niobium powder, 5-10 parts of carbon nanotube-supported lanthanum oxide-yttrium powder, and 5-10 parts of copolymer-coated titanium diboride powder; Step 2: Place Al 0.7 CoCrFeNi 2.1 High-entropy alloy, tungsten powder, zirconium powder, niobium powder, carbon nanotube-supported lanthanum-yttrium oxide powder, and copolymer-coated titanium diboride powder are added to a planetary ball mill, protected by argon gas, and ball milled to obtain laser cladding powder.

Images