Nano TiN net structure metal-based coating and preparation method thereof

Abstract

The invention provides a nano TiN net structure metal-based coating and a preparation method thereof.The nano TiN net structure metal-based coating is prepared from, by mass, 90-97% of IN718 alloy powder and 3-10% of TiN powder.The preparation method comprises the following steps that S1, the material for preparing the nano TiN net structure metal-based coating is obtained; s2, a base material needing to be coated with a nano TiN net structure metal-based coating is obtained; and S3, the base material is coated with the material obtained in the step S1, meanwhile, the material is scanned through double-laser irradiation, and the nano TiN net-shaped structure metal-based coating is obtained.The TiN powder is added, so that nano TiN particles are evenly distributed in the coating, the nano TiN particles are connected through a large number of dislocation winding, and the nano TiN net-shaped microstructure reinforced coating is formed. And the corrosion resistance of the coating is improved.

Description

Technical Field

[0001] The invention relates to the technical field of material surface treatment, and in particular to a nano TiN mesh structure metal-based coating and a preparation method thereof. Background Art

[0002] Since marine structures such as ships, offshore platforms, bridges, etc. are exposed to harsh marine environments for a long time, they are susceptible to seawater corrosion and wear, resulting in a reduced service life. At present, in order to improve the corrosion resistance of marine structures, metal corrosion-resistant coatings such as IN718 nickel alloy are applied on their surfaces, but the corrosion resistance is weak. Summary of the invention

[0003] In view of this, the present invention proposes a nano-TiN network structure metal-based coating and a preparation method. By adding TiN powder, nano-TiN particles are evenly distributed in the coating, and the nano-TiN particles are connected by a large number of dislocation entanglements to form a nano-TiN network microstructure reinforced coating, thereby improving the corrosion resistance of the coating.

[0004] The technical solution of the present invention is implemented as follows: the present invention provides a nano-TiN network structure metal-based coating, comprising the following materials by mass fraction: 90-97% IN718 alloy powder; and 3-10% TiN powder.

[0005] On the basis of the above technical scheme, preferably, the diameter of the IN718 alloy powder is not less than 35 μm, the oxygen content of the IN718 alloy powder is not less than 100 ppm, and the fluidity of the IN718 alloy powder is not less than 30 s / 50 g; and / or, the diameter of the TiN powder is not less than 35 μm, the oxygen content of the TiN powder is not less than 100 ppm, and the fluidity of the IN718 alloy powder is not less than 30 s / 50 g. The nano-TiN network structure metal-based coating prepared under these conditions has good effect.

[0006] The present invention also provides a method for preparing a nano-TiN network structure metal-based coating, comprising the following steps:

[0007] S1. Obtaining materials for preparing a nano-TiN network structure metal-based coating;

[0008] S2, obtaining a substrate to be coated with a nano-TiN network structure metal-based coating;

[0009] S3, coating the material obtained in step S1 on the substrate, and scanning the material by dual laser irradiation to obtain a nano-TiN network structure metal-based coating.

[0010] Based on the above technical solution, preferably, in step S3, the thickness of the obtained nano-TiN network structure metal-based coating is 10-15 μm, for example, its thickness can be 10 μm, 12 μm, 15 μm, etc. Within this range, the corrosion resistance is good and material is saved.

[0011] On the basis of the above technical solution, preferably, the dual laser includes a linear moving fiber laser and a circular moving green laser, and the circular moving green laser can make up for the shortcomings of insufficient melting of the linear moving fiber laser, increase the flow dynamics of the molten pool, and promote the uniform distribution of nano TiN particles.

[0012] On the basis of the above technical solution, preferably, the power of the dual laser is 100-150W; and / or the scanning speed of the dual laser is 1200-1600mm / s; and / or the scanning interval of the dual laser is 10-15μm.

[0013] Based on the above technical solution, preferably, step S2 includes:

[0014] S21, modeling the substrate using three-dimensional software to obtain dual laser scanning trajectory data;

[0015] S22, while coating the material obtained in step S1 on the substrate, according to the dual laser scanning trajectory data, the dual laser irradiates and scans the material to obtain a nano-TiN network structure metal-based coating.

[0016] The nano-TiN mesh structure metal-based coating and the preparation method thereof of the present invention have the following beneficial effects compared with the prior art:

[0017] (1) The present invention adds TiN powder to IN718 alloy powder, so that nano-TiN particles are evenly distributed in the coating, and the nano-TiN particles are connected by a large number of dislocation entanglements to form a nano-TiN network microstructure reinforced coating, thereby improving the corrosion resistance of the coating.

[0018] (2) The preparation method of the present invention uses dual laser coupling processing, wherein the dual lasers include a linear moving fiber laser and a circular moving green laser. The circular moving green laser can supplement the deficiency of linear moving fiber laser melting, increase the flow dynamics of the molten pool, and promote the uniform distribution of nano TiN particles. DETAILED DESCRIPTION

[0019] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1

[0021] Provided is a nano-TiN network structure metal-based coating, comprising 90kg IN718 alloy powder and 10kg TiN powder, the preparation method comprising the following steps:

[0022] S1. Mix 90 kg of IN718 alloy powder and 3 kg of TiN powder, and then ball mill them to prepare a mixed powder having a diameter of not less than 35 μm, an oxygen content of not less than 100 ppm, and a fluidity of not less than 30 s / 50 g;

[0023] S2. Obtain the substrate to be coated, such as a handrail or other component structure on the hull;

[0024] S3, modeling the substrate by 3D software, slicing the model and setting the printing path, the slice thickness is 10μm, the scanning path is an orthogonal scanning strategy, the purpose is to obtain the scanning trajectory data required by the linear moving fiber laser and the circular moving green laser, after obtaining the data, the material obtained by step S1 is coated on the substrate, and according to the dual laser scanning trajectory data, the dual laser irradiation scans the material to melt the material to obtain a nano TiN mesh structure metal-based coating. Wherein, the power of the dual laser is 100W, the scanning speed is 1500mm / s, the scanning spacing is 10μm, and the thickness of the nano TiN mesh structure metal-based coating is 10μm.

[0025] Example 2

[0026] A nano-TiN network structure metal-based coating is provided, and the preparation method is the same as that of Example 1, except that it includes 92 kg IN718 alloy powder and 8 kg TiN powder.

[0027] Example 3

[0028] A nano-TiN network structure metal-based coating is provided, and the preparation method is the same as that of Example 1, except that it includes 95 kg IN718 alloy powder and 5 kg TiN powder.

[0029] Example 4

[0030] A nano-TiN network structure metal-based coating is provided, and the preparation method is the same as that of Example 1, except that it includes 97 kg IN718 alloy powder and 3 kg TiN powder.

[0031] Example 5

[0032] Provided is a nano-TiN network structure metal-based coating, comprising 90kg IN718 alloy powder and 10kg TiN powder (the same as in Example 1), and the preparation method is the same as in Example 1, except that the thickness of the nano-TiN network structure metal-based coating is 15μm.

[0033] Example 6

[0034] Provided is a nano-TiN network structure metal-based coating, comprising 90kg IN718 alloy powder and 10kg TiN powder (the same as in Example 1), and a preparation method is the same as in Example 1, except that the power of the dual laser is 120W, the scanning speed is 1200mm / s, the scanning spacing is 12μm, and the thickness of the nano-TiN network structure metal-based coating is 10μm.

[0035] Comparative Example 1

[0036] A nano-TiN network structure metal-based coating is provided, and the preparation method is the same as that of Example 1, except that 100 kg of IN718 alloy powder is included.

[0037] Comparative Example 2

[0038] A nano-TiN network structure metal-based coating is provided, and the preparation method is the same as that of Example 1, except that it includes 88 kg IN718 alloy powder and 12 kg TiN powder.

[0039] Comparative Example 3

[0040] A nano-TiN network structure metal-based coating is provided, comprising 90 kg IN718 alloy powder and 10 kg TiN powder (the same as in Example 1). The preparation method is the same as in Example 1, except that the dual lasers in Example 1 are replaced with a single ring-shaped moving green laser, and the power of the single ring-shaped moving green laser is 200 W.

[0041] Comparative Example 4

[0042] A nano-TiN mesh structure metal-based coating is provided, comprising 100kg IN718 alloy powder, and the preparation method is the same as that of Example 1, except that the dual lasers in Example 1 are replaced with a single annular moving green laser, and the power of the single annular moving green laser is 200W.

[0043] Performance testing and results

[0044] The nano-TiN network structure metal-based coatings prepared in Examples 1-6 and Comparative Examples 1-4 were subjected to hardness and corrosion resistance tests in the same environment and using the same method, wherein a Vickers hardness tester was used to test the hardness of the nano-TiN network structure metal-based coatings prepared in Examples 1-6 and Comparative Examples 1-4 in accordance with the "GB / T7997-2014 Cemented Carbide Vickers Hardness Test Method"; the tensile strength test was performed on the nano-TiN network structure metal-based coatings prepared in Examples 1-6 and Comparative Examples 1-4 in accordance with the "GB / T17720-1999 Metal Covering Layer Porosity Test Evaluation Standard"; the nano-TiN network structure metal-based coatings prepared in Examples 1-6 and Comparative Examples 1-4 were cut into test samples of 10 cm×10 cm×0.8 cm, immersed in 1 mol / L hydrochloric acid aqueous solution, and an electrochemical corrosion test was performed using a three-electrode electrochemical cell system, wherein the test sample, platinum electrode, and saturated calomel electrode corresponded to the working electrode, the counting electrode, and the reference electrode, respectively. After reaching a stable open circuit potential, -2 -10 5 The test was conducted in the frequency range of 100 Hz, with a potential disturbance of 10 mV. In the voltage range of -1-3 V, the potential was scanned at 1 mV / s, and the composite corrosion potential and corrosion current during the corrosion process were detected and recorded. The results are shown in Table 1.

[0045] Table 1 Performance test data of nano-TiN network structure metal-based coatings in embodiments and comparative examples

[0046] Hardness / HV Void ratio / % Example 1 420 0.21 Example 2 413 0.31 Example 3 413 0.22 Example 4 400 0.15 Example 5 416 0.24 Comparative Example 1 360 0.21 Comparative Example 2 428 0.12 Comparative Example 3 424 0.13 Comparative Example 4 310 1.24

[0047] From Table 1, we can draw the following conclusions:

[0048] (1) Strengthening alloy structure: The addition of nanoparticles can form strengthening phases at grain boundaries and within grains, hindering dislocation movement and improving the tensile strength and hardness of the alloy.

[0049] (2) Improve corrosion resistance: The dispersion of nanoparticles can inhibit the grain growth of the alloy, thereby improving the corrosion resistance of the alloy.

[0050] (3) Local heating and rapid cooling: Laser shock can heat the alloy with high energy in a local area, causing it to melt and solidify rapidly, thereby forming fine grains and a uniform organizational structure.

[0051] (4) Precision control: Laser shock technology can achieve precise control of the heating area, thereby achieving fine regulation of the alloy microstructure and improving the performance and stability of the alloy.

[0052] (5) Reducing residual stress: Laser shock processing can reduce the residual stress of the alloy and reduce the risk of stress relaxation and deformation of the alloy during use.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A nano-TiN network structure metal-based coating, characterized in that: Includes the following materials by mass: 90-97% IN718 alloy powder; and, 3-10% TiN powder.

2. The nano-TiN network structure metal-based coating according to claim 1, characterized in that: The diameter of the IN718 alloy powder is not less than 35 μm, the oxygen content of the IN718 alloy powder is not less than 100 ppm, and the fluidity of the IN718 alloy powder is not less than 30 s / 50 g; and / or, The diameter of the TiN powder is not less than 35 μm, the oxygen content of the TiN powder is not less than 100 ppm, and the fluidity of the IN718 alloy powder is not less than 30 s / 50 g.

3. The method for preparing the nano-TiN network structure metal-based coating according to claim 1 or 2, characterized in that: The following steps are involved: S1. Obtaining materials for preparing a nano-TiN network structure metal-based coating; S2, obtaining a substrate to be coated with a nano-TiN network structure metal-based coating; S3, coating the material obtained in step S1 on the substrate, and scanning the material by dual laser irradiation to obtain a nano-TiN network structure metal-based coating.

4. The method for preparing the nano-TiN network structure metal-based coating according to claim 3, characterized in that: In step S3, the thickness of the obtained nano-TiN network structure metal-based coating is 10-15 μm.

5. The method for preparing the nano-TiN network structure metal-based coating according to claim 3, characterized in that: The dual lasers include a linearly movable optical fiber laser and a circularly movable green laser.

6. The method for preparing the nano-TiN network structure metal-based coating according to claim 3, characterized in that: The power of the dual laser is 100-150W; and / or, The scanning speed of the dual laser is 1200-1600 mm / s; and / or, The scanning interval of the dual lasers is 10-15 μm.

7. The method for preparing the nano-TiN network structure metal-based coating according to claim 3, characterized in that: Step S2 includes: S21, modeling the substrate using three-dimensional software to obtain dual laser scanning trajectory data; S22, while coating the material obtained in step S1 on the substrate, according to the dual laser scanning trajectory data, the dual laser irradiates and scans the material to obtain a nano-TiN network structure metal-based coating.