Additive manufacturing part with coating and preparation method and application thereof

Abstract

The invention relates to the technical field of surface treatment of three-dimensional additive manufacturing parts, in particular to an additive manufacturing part with a coating and a preparation method and application of the additive manufacturing part, the surface of the additive manufacturing part is provided with the coating, and the coating is prepared from a polyaryletherketone solution with the mass concentration of 6%-16%. The polyaryletherketone solution with the concentration of 6%-16% is adopted to form the polyaryletherketone coating on the surface of the additive manufacturing part, the coating has strong binding force with the surface of the additive manufacturing part, and the coating is stable and not prone to falling off; the surface hydrolysis resistance, corrosion resistance and wear resistance of the additive manufacturing part can be remarkably improved, the surface roughness of the additive manufacturing part is reduced, the wear rate is remarkably reduced, the surface quality of the additive manufacturing part is effectively improved, and the additive manufacturing part can be suitable for a more stringent service environment.

Description

Technical Field

[0001] The present invention relates to the technical field of surface treatment of three-dimensional additively manufactured parts, and in particular to an additively manufactured part with a coating, a preparation method thereof, and an application thereof. Background Art

[0002] Three-dimensional additive manufacturing technology, also known as 3D printing technology, constructs three-dimensional entities by accumulating materials layer by layer, and has been widely used in many fields such as industrial manufacturing, biomedicine, aerospace, etc. In order to improve the surface quality and wear resistance of some engineering plastics and fiber three-dimensional additive parts, it is usually necessary to post-process the printed samples. Although traditional post-processing technologies such as mechanical grinding, chemical etching and sandblasting can improve surface quality and wear resistance to a certain extent, they are often inefficient, have limited improvement effects, and may damage the microstructure of the material.

[0003] Therefore, it is necessary to develop a coating suitable for three-dimensional additively manufactured parts to improve the surface properties of three-dimensional additively manufactured parts. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the prior art at least to a certain extent. To this end, one object of the present invention is to provide an additively manufactured part with a coating and a preparation method and application thereof.

[0005] In a first aspect of the present invention, the present invention provides an additively manufactured part with a coating, wherein the surface of the additively manufactured part has a coating, and the coating is prepared using a polyaryletherketone solution with a mass concentration of 6% to 16%.

[0006] According to the above-mentioned additively manufactured part with coating of the present invention, the surface of the additively manufactured part has a coating, and the polyaryletherketone coating is formed on the surface of the additively manufactured part by using a polyaryletherketone solution with a mass concentration of 6% to 16%, for example, the mass concentration of polyaryletherketone in the polyaryletherketone solution is 6%, 9%, 11%, 13%, 15%, 16%, etc., or the range between any two of the above values. On the one hand, the formed polyaryletherketone coating has a strong bonding force with the surface of the additively manufactured part, and the coating is stable and not easy to fall off. On the other hand, the formed polyaryletherketone coating can significantly improve the surface quality of the additively manufactured part, for example, reduce the surface roughness of the additively manufactured part, and improve the surface corrosion resistance and wear resistance of the additively manufactured part. As a result, the additively manufactured part with coating has a high-quality surface and strong corrosion resistance and wear resistance.

[0007] According to the above-mentioned additive manufacturing part with coating of the present invention, the mass proportion of the solvent in the polyaryletherketone solution is 76% to 94%. For example, the mass proportion of the solvent is 76%, 80%, 85%, 90%, 94%, etc., or the range between any two of the above values. By controlling the mass proportion of the solvent in the polyaryletherketone solution within the above range, the roughness of the surface of the additive manufacturing part can be significantly reduced, and the surface of the coating formed is smooth, and has excellent wear resistance and corrosion resistance, and at the same time, the bonding strength between the coating and the surface of the additive manufacturing part is high.

[0008] According to the additively manufactured part with coating described above of the present invention, the solvent includes at least one of dichloromethane, dimethylformamide, trichloroethane and dichloroethane, preferably dichloromethane, and polyaryletherketone has a greater solubility in dichloromethane.

[0009] According to the additively manufactured part with coating of the present invention, the polyaryletherketone solution further comprises at least one of a leveling agent and a defoaming agent. By adding the leveling agent, the surface tension of the solution is reduced, thereby improving the quality of the coating; by adding the defoaming agent, the foam generated during the preparation of the polyaryletherketone solution can be eliminated.

[0010] According to the above-mentioned additively manufactured part with coating of the present invention, the leveling agent includes a water-based polysiloxane leveling agent; for example, the leveling agent includes but is not limited to one or more of AFCONA-3580, AFCONA-3581, AFCONA-3590, AFCONA-3593, EFKA-3522, and EFKA-3580.

[0011] According to the above-mentioned additively manufactured part with coating of the present invention, the defoaming agent includes an aqueous polysiloxane defoaming agent; for example, the defoaming agent includes but is not limited to one or more of FM-3110, AFCONA-2507, AFCONA-2508, AFCONA-2025, AFCONA-2524, AFCONA-2530, and AFCONA-2590.

[0012] According to the additively manufactured part with coating of the present invention, the mass proportion of the leveling agent is no more than 4% based on the total mass of the polyaryletherketone solution. For example, the mass proportion of the leveling agent is 1%, 2%, 3%, 4%, etc., or a range between any two of the above values.

[0013] According to the additively manufactured part with a coating of the present invention, the mass proportion of the defoamer is no more than 4% based on the total mass of the polyaryletherketone solution. For example, the mass proportion of the defoamer is 1%, 2%, 3%, 4%, etc., or a range between any two of the above values.

[0014] Preferably, the polyaryletherketone solution comprises 6wt% to 16wt% of polyaryletherketone, 76wt% to 94wt% of solvent, 0wt% to 4wt% of leveling agent and 0wt% of defoaming agent. The coating prepared by using the polyaryletherketone solution has excellent flatness, high bonding strength between the coating and the surface of the additively manufactured part, and corrosion resistance and friction resistance.

[0015] According to the above-mentioned additively manufactured part with coating of the present invention, the polyaryletherketone in the polyaryletherketone solution includes at least one of polyetherketoneketone, polyetheretherketone, polyetherketone, polyetheretherketoneketone, and polyetherketoneetherketoneketone, preferably polyetherketoneketone.

[0016] As an example, the chemical structure of polyaryletherketone is as follows: According to the additive manufacturing part with coating of the present invention, the material of the additive manufacturing part includes polyetheretherketone, polyetherketoneketone, polyphenylene sulfide, carbon fiber or glass fiber, preferably polyetheretherketone and polyetherketoneketone. The additive manufacturing part of the above material has good bonding strength with the polyaryletherketone coating, and the coating is stable and does not fall off.

[0017] According to the above-mentioned additively manufactured part with coating of the present invention, the preparation process of the additively manufactured part includes but is not limited to powder bed fusion process (PBF), fused wire manufacturing process (FFF), sheet lamination process (LOM) and the like.

[0018] In a second aspect of the present invention, the present invention provides a method for preparing the above-mentioned additively manufactured part with a coating, the method comprising: dissolving polyaryletherketone in a solvent to obtain a polyaryletherketone solution; The polyaryletherketone solution is applied on the surface of the additively manufactured part.

[0019] First, the polyaryletherketone is dissolved in a solvent to obtain a polyaryletherketone solution. During the dissolution process, stirring can be performed to accelerate the dissolution. Furthermore, the stirring rate is 100r / min~1000r / min. Then the polyaryletherketone solution obtained above is applied to the surface of the additive manufacturing part. After the solvent evaporates, a polyaryletherketone coating is formed on the surface of the additive manufacturing part. Thus, the method can be used to prepare an additive manufacturing part with a polyaryletherketone coating. The coating preparation process can be referred to Figure 1 .

[0020] It should be noted that the temperature of the dissolved solvent is not higher than the boiling point of the solvent, so as to prevent the solvent from volatilizing due to the stirring and heating. Further, the temperature of the solvent is kept constant as much as possible during the dissolution process to avoid the dissolved polyaryletherketone from precipitating again due to temperature fluctuations. Specifically, a circulating water bath can be used to control the solution temperature, and the solution temperature is kept constant until the polyaryletherketone raw material is completely dissolved. The present invention does not particularly limit the shape of the polyaryletherketone, for example, it can be a powdered polyaryletherketone or a granular polyaryletherketone, as long as it is soluble in the solvent.

[0021] According to the above method for preparing an additively manufactured part with a coating of the present invention, the temperature at which the polyaryletherketone dissolves in the solvent is not higher than 40°C. For example, the temperature at which the polyaryletherketone dissolves is 35°C, 30°C, 25°C, 20°C, etc., or a range between any two of the above values. By controlling the dissolution temperature within the above range, the volatilization of the solvent caused by excessive temperature can be avoided, the concentration of the polyaryletherketone in the polyaryletherketone solution can be kept unchanged, the coating quality can be improved, and the energy consumption can be reduced.

[0022] According to the above method for preparing an additively manufactured part with a coating of the present invention, the polyaryletherketone solution is applied to the surface of the additively manufactured part in a manner including but not limited to spraying or dipping. Further, the spraying process can be applied to conventional shaped parts, and the dipping process can be applied to special-shaped parts.

[0023] In a third aspect of the present invention, the present invention proposes the application of the above-mentioned additively manufactured part with coating or the additively manufactured part with coating prepared by the above-mentioned method in the field of industrial manufacturing, biomedicine or aerospace.

[0024] The present invention has at least the following technical effects: (1) The present invention forms a polyaryletherketone coating on the surface of the additively manufactured part. The coating has a strong bonding force with the surface of the additively manufactured part. The coating is stable and not easy to fall off. It can significantly improve the surface corrosion resistance and wear resistance of the additively manufactured part and reduce the surface roughness of the additively manufactured part. The wear rate is significantly reduced, and the surface quality of the additively manufactured part is effectively improved, which can be applied to more severe service environments.

[0025] (2) The coating solution of the present invention is prepared by mixing and stirring at room temperature to dissolve. After coating, it only needs to be dried and solidified at room temperature. There is no need for post-treatment such as secondary high-temperature sintering used in polymer coatings such as polyaryletherketone. The preparation time is short, the process is simple and easy, and it is easy to realize industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 is a process flow chart of the additive manufacturing part preparation process with coating of the present invention; Figure 2 is a 3D image of an additively manufactured sample of a concentration coating in Example 1 of the present invention; Figure 3 is a 3D image of an additively manufactured sample of a concentration coating in Example 2 of the present invention; Figure 4 is a 3D image of an additively manufactured sample of a concentration coating in Example 3 of the present invention; Figure 5 is a 3D image of an additively manufactured sample of a concentration coating in Example 4 of the present invention; Figure 6 It is a 3D image of the additively manufactured sample without dip coating in Comparative Example 1 of the present invention; Figure 7 This is a scanning electron microscope comparison of the additively manufactured sample of Example 2 with dip coating in the present invention and the sample of Comparative Example 1 without dip coating. DETAILED DESCRIPTION

[0028] 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. The present invention is described below with reference to specific embodiments. It should be noted that these embodiments are merely illustrative and do not limit the present invention in any way.

[0029] Example 1 This embodiment provides a surface treatment (coating preparation) method for a 3D printed flat plate based on soluble polyaryletherketone, and the surface treatment method mainly includes the following steps: (1) 10 g of soluble polyaryletherketone raw material, 100 ml of solvent dichloromethane, 3 g of leveling agent (AFCONA-3580), and 2 g of defoaming agent (AFCONA-2507) were mixed and added to the reaction container, and stirred at a constant speed of 800 r / min. At the same time, a circulating water bath was used to control the solution temperature to be constant (25°C) until the polyaryletherketone raw material was completely dissolved; The chemical structure of polyaryletherketone is as follows: .

[0030] (2) Soak the flat plate printed by the three-dimensional additive manufacturing process in the polyaryletherketone solution prepared in step (1) for 2s-3s, take it out and dry it naturally. The three-dimensional additive manufacturing process adopts fused filament manufacturing (FFF). The material of the flat plate is polyetheretherketone. A three-dimensional additive manufacturing flat plate with a coating is obtained. The specific surface morphology 3D image can be referred to Figure 2 .

[0031] Example 2 This embodiment provides a surface treatment method for a 3D printed porous hollow cylindrical part based on soluble polyaryletherketone, and the surface treatment method mainly comprises the following steps: (1) 15 g of soluble polyaryletherketone raw material, 100 ml of solvent dichloromethane, 3 g of leveling agent (AFCONA-3580), and 2 g of defoaming agent (AFCONA-2507) were mixed and added to the reaction container, and stirred at a constant speed of 800 r / min. At the same time, a circulating water bath was used to control the solution temperature to be constant (25°C) until the polyaryletherketone raw material was completely dissolved; (2) Soak the flat plate printed by the three-dimensional additive manufacturing process in the polyaryletherketone solution prepared in step (1) for 2s-3s, take it out and dry it naturally. The three-dimensional additive manufacturing process adopts fused filament manufacturing (FFF), and the material of the flat plate is polyetheretherketone, so as to obtain a three-dimensional additive manufacturing flat plate with a coating. For specific surface morphology 3D images, please refer to Figure 3 .

[0032] Example 3 This embodiment provides a surface treatment (coating preparation) method for a 3D printed flat plate based on soluble polyaryletherketone, and the surface treatment method mainly includes the following steps: (1) 20 g of soluble polyaryletherketone raw material, 100 ml of solvent dichloromethane, 3 g of leveling agent (AFCONA-3580), and 2 g of defoaming agent (AFCONA-2507) were mixed and added into a reaction vessel. The mixture was stirred at a constant speed of 800 r / min. At the same time, a circulating water bath was used to control the solution temperature to be constant (25°C) until the polyaryletherketone raw material was completely dissolved. (2) Soak the flat plate printed by the three-dimensional additive manufacturing process in the polyaryletherketone solution prepared in step (1) for 2s-3s, take it out and dry it naturally. The three-dimensional additive manufacturing process adopts fused filament manufacturing (FFF), and the material of the flat plate is polyetheretherketone, so as to obtain a three-dimensional additive manufacturing flat plate with a coating. For specific surface morphology 3D images, please refer to Figure 4 .

[0033] Example 4 This embodiment provides a surface treatment (coating preparation) method for a 3D printed flat plate based on soluble polyaryletherketone, and the surface treatment method mainly includes the following steps: (1) 25 g of soluble polyaryletherketone raw material, 100 ml of solvent dichloromethane, 3 g of leveling agent (AFCONA-3580) and 2 g of defoaming agent (AFCONA-2507) were mixed and added into a reaction vessel. The mixture was stirred at a constant speed of 800 r / min. At the same time, a circulating water bath was used to control the solution temperature to be constant (25°C) until the polyaryletherketone raw material was completely dissolved. (2) Soak the flat plate printed by the three-dimensional additive manufacturing process in the polyaryletherketone solution prepared in step (1) for 2s-3s, take it out and dry it naturally. The three-dimensional additive manufacturing process adopts fused filament manufacturing (FFF), and the material of the flat plate is polyetheretherketone, so as to obtain a three-dimensional additive manufacturing flat plate with a coating. For specific surface morphology 3D images, please refer to Figure 5 .

[0034] Comparative Example 1 Comparative Example 1 provides a 3D printed flat plate, the preparation process of which is the same as that of Examples 1-4, without coating design, the three-dimensional additive manufacturing process adopts fused filament manufacturing (FFF), the material of the flat plate is polyetheretherketone, and a three-dimensional additive manufacturing flat plate with a coating is obtained, and the surface 3D image is shown in Figure 6 .

[0035] Test example In order to verify the quality of the additively manufactured parts with coatings of the present invention, the additively manufactured parts with coatings of the embodiments and comparative examples were tested, and the specific method is as follows: Roughness detection: Use a three-dimensional profiler to test surface roughness data.

[0036] Wear resistance test: The wear resistance is tested using a three-dimensional profiler. The experimental conditions are as follows: (1) Steel ball diameter, 6 mm (2) Normal force, 25.0 N, (3) Stroke length, 10.0 mm, (4) Oscillation frequency, 5.0 Hz, (5) Test duration, 16 minutes and 40 seconds (sliding distance 100 meters), (6) Ambient temperature, 22°C 6 3°C, (7) Relative humidity, 40% to 60%, and (8) Lubrication, not applied.

[0037] The quality test results of the additively manufactured parts with coatings of the embodiments and comparative examples are shown in Table 1.

[0038] Table 1

[0039] It can be seen from the data in Table 1 that the roughness and wear rate of the manufactured parts after dip coating in the embodiment are lower than the roughness and wear rate of the uncoated manufactured parts in comparative example 1, indicating that the surface of the manufactured parts of the present invention is smoother and the wear resistance is significantly improved.

[0040] The electron microscope image of the surface of the 3D printed flat plate of Example 2 after dip coating and the electron microscope image of the surface of the 3D printed flat plate of Comparative Example 1 are as follows: Figure 7 As shown, from Figure 7 It can be seen that the coated surface of Example 3 is more dense and smooth.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An additively manufactured part having a coating, characterized in that: The surface of the additively manufactured part has a coating, and the coating is prepared by using a polyaryletherketone solution with a mass concentration of 6% to 16%.

2. The additively manufactured part with coating according to claim 1, characterized in that: The mass proportion of the solvent in the polyaryletherketone solution is 76% to 94%.

3. The additively manufactured part with coating according to claim 1 or 2, characterized in that: The solvent in the polyaryletherketone solution includes at least one of dichloromethane, dimethylformamide, trichloroethane and dichloroethane.

4. The additively manufactured part with coating according to claim 1 or 2, characterized in that: The polyaryletherketone solution further comprises at least one of a leveling agent and a defoaming agent.

5. The additively manufactured part with coating according to claim 4, characterized in that: The mass fraction of the leveling agent in the polyaryletherketone solution is not more than 4%; And / or, the mass fraction of the defoaming agent in the polyaryletherketone solution is not greater than 4%.

6. The additively manufactured part with coating according to claim 4, characterized in that: The polyaryletherketone solution comprises 6wt% to 16wt% of polyaryletherketone, 76wt% to 94wt% of a solvent, 0wt% to 4wt% of a leveling agent and 0wt% to 4wt% of a defoaming agent.

7. The additively manufactured part with coating according to claim 1 or 2, characterized in that: The polyaryletherketone in the polyaryletherketone solution comprises at least one of polyetherketoneketone, polyetheretherketone, polyetherketone, polyetheretherketoneketone, and polyetherketoneetherketoneketone; And / or, the material of the additively manufactured part includes polyetheretherketone, polyetherketoneketone, polyphenylene sulfide, carbon fiber or glass fiber, preferably polyetheretherketone and polyetherketoneketone.

8. A method for preparing an additively manufactured part having a coating as claimed in any one of claims 1 to 7, characterized in that: include: dissolving polyaryletherketone in a solvent to obtain a polyaryletherketone solution; The polyaryletherketone solution is applied on the surface of the additively manufactured part.

9. The method according to claim 8, characterized in that: The temperature at which the polyaryletherketone dissolves in the solvent is not higher than 40°C; And / or, the applying method includes spraying or dipping.

10. Application of the additively manufactured part with a coating according to any one of claims 1 to 7 or the additively manufactured part with a coating prepared by the method according to claim 8 or 9 in the fields of industrial manufacturing, biomedicine or aerospace.

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