Coating dispersion disc and manufacturing method thereof

Abstract

The invention relates to a coating dispersion disc and a manufacturing method thereof. The manufacturing method of the coating dispersion disc comprises the following steps: manufacturing a disc body of the dispersion disc by using an additive manufacturing process, so that the disc body is integrally formed; based on a physical vapor deposition method, an arc ion plating machine is used for manufacturing a multi-layer coating on the outer surface of a disc body, the multi-layer coating comprises at least four layers of first sub-coatings and at least four layers of second sub-coatings, and the first sub-coatings and the second sub-coatings are the same in arrangement layer number and are sequentially and alternately arranged in a stacked mode. The first sub-coating is a CrN coating, and the second sub-coating is a TiN coating. The dispersing disc has higher mechanical strength, higher wear resistance and higher corrosion resistance, so that the problem of coating stripping of the dispersing disc is avoided, the lithium battery slurry is prevented from being polluted, and the quality of the slurry is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of stirring equipment, in particular to a coating dispersion disc and a manufacturing method thereof. Background Art

[0002] Dispersing discs are widely used in the fields of new energy, food, and chemical mixing. Since the material of the dispersing disc is mainly austenitic stainless steel such as 304 and 316L, the material is relatively soft, with low strength and poor wear resistance, it is difficult to be used in the production of lithium battery slurry.

[0003] In the related technology, the dispersion disk improves the wear resistance and hardness by spraying tungsten carbide coating on the surface. The tungsten carbide coating uses metals such as cobalt as a bonding phase to improve the strength and bonding properties of the coating.

[0004] However, although the tungsten carbide coating has high hardness in data, it is affected by multiple factors in actual use, which makes the dispersion disk sprayed with tungsten carbide coating have the following problems:

[0005] (1) The bonding strength between tungsten carbide coating and 304 and 316L is low, and the coating will peel off during the use of the dispersion disc;

[0006] (2) For the lithium battery industry, solvents such as CMC in battery slurry can cause corrosion and precipitation of the binding phase (such as cobalt and other metals) in the tungsten carbide coating, thereby contaminating the lithium battery slurry and affecting the slurry quality. Summary of the invention

[0007] In view of the shortcomings of the above-mentioned existing production technology, the applicant provides a coated dispersion disk and a method for manufacturing the same, which can make the dispersion have higher mechanical strength, higher wear resistance, and stronger corrosion resistance, thereby avoiding the problem of coating peeling on the dispersion disk, preventing contamination of lithium battery slurry, and ensuring the quality of the slurry.

[0008] The technical solution adopted by the present invention is as follows:

[0009] A method for manufacturing a coating dispersion disc comprises the following steps:

[0010] The disc body of the dispersion disc is manufactured by using an additive manufacturing process, so that the disc body is integrally formed;

[0011] Based on the physical vapor deposition method, an arc ion plating machine is used to make a multi-layer coating on the outer surface of the disk body. The multi-layer coating includes at least four layers of first sub-coatings and at least four layers of second sub-coatings. The first sub-coatings and the second sub-coatings have the same number of layers and are alternately stacked in sequence. The first sub-coating is a CrN coating, and the second sub-coating is a TiN coating.

[0012] The manufacturing process of the plate body comprises the following steps:

[0013] First, the Cx printing powder and the binder are kneaded and mixed to form granules using additive manufacturing equipment to obtain printing particles;

[0014] Subsequently, the additive manufacturing device heats and melts the printing particles and ejects them from a nozzle, thereby performing layer printing;

[0015] Then, the additive manufacturing device forms the printed particles into the required shape of the disc body through layer printing, and after cooling and solidification, a disc body made of Cx material is manufactured. At this time, the residual austenite content in the Cx material forming the disc body is 18%-22%;

[0016] Next, the disk obtained after cooling and solidification is subjected to a solution treatment, the solution holding temperature is 850° C., and the solution holding time is 30 min, so that the content of retained austenite in the Cx material forming the disk is reduced to ≤4%;

[0017] Finally, the disk body after solution treatment is subjected to aging treatment, with the aging insulation temperature being 525°C and the aging insulation time being 4 hours, so that the hardness of the disk body reaches 50HRC and the yield strength of the disk body reaches 1600MPa.

[0018] During the layer printing process, the layer thickness of the additive manufacturing equipment is 30μm, the layer thickness laser power of the additive manufacturing equipment is 200W, the scanning speed of the additive manufacturing equipment is 720mm / s, and the scanning spacing of the additive manufacturing equipment is 0.12mm.

[0019] After the solution treatment is completed, the tray needs to be air-cooled to room temperature.

[0020] After the aging treatment is completed, the plate needs to be air-cooled to room temperature.

[0021] The manufacturing process of the multi-layer coating comprises the following steps:

[0022] First, the vacuum system of the arc ion plating machine is evacuated to make the coating environment pressure inside the arc ion plating machine reach 3.5×10 -3 Pa, and then introduce argon gas with a purity of 99.99% into the arc ion plating machine, so that the coating environment pressure inside the arc ion plating machine reaches 0.4Pa;

[0023] Then, the arc ion plating machine generates a bias voltage, and the disc body is cleaned by the bias voltage for 10 minutes, thereby removing pollutants on the outer surface of the disc body.

[0024] The amplitude of the bias voltage is 400V, and the frequency of the bias voltage is 42KHz;

[0025] Finally, nitrogen gas with a purity of 99.99% is introduced into the arc ion plating machine so that the coating environment pressure inside the arc ion plating machine reaches 4Pa. At the same time, the arc starting system of the arc ion plating machine ignites the metal target arc to obtain metal plasma, which is deposited on the outer surface of the disk to form a multi-layer coating.

[0026] The multilayer coating 2 is made of a Cr / Ti alloy material with a purity of 99.99%.

[0027] During the metal plasma deposition process, the deposition temperature was 300°C and the deposition time was 300 min.

[0028] The ratio of the thickness of the first sub-coating layer to the thickness of the second sub-coating layer is 1:2.

[0029] A coating dispersion disk manufactured based on the above-mentioned coating dispersion disk manufacturing method includes a disc-shaped disk body, a through hole is opened in the middle of the disk body, and dispersion teeth are evenly arranged along the circumference of the edge of the disk body. The dispersion teeth are integrally formed with the disk body, and the outer surface of the dispersion teeth and the disk body are covered with multiple layers of coating at the same time.

[0030] The beneficial effects of the present invention are as follows:

[0031] The present invention adopts an additive manufacturing process to manufacture a disk body of Cx material, so that the dispersion disk of the present invention has higher strength than a traditional dispersion disk, and the disk body and the dispersion teeth are an integrated structure, which is integrally formed by the additive manufacturing process, and can avoid the problem of being unable to bend due to the excessive hardness of the dispersion teeth.

[0032] The present invention adopts PVD arc ion plating CrN / TiN multilayer coating, so that the dispersion disk of the present invention can have high strength, high hardness and high wear resistance while ensuring corrosion resistance, thereby improving the service life of the dispersion disk.

[0033] The multi-layer coating and the disc body in the present invention have high adhesion strength, which can avoid the problem of coating shedding, thereby making the dispersion disc of the present invention more suitable for lithium battery slurry production, avoiding the problem of corrosion and precipitation of metals such as cobalt in the bonding phase of the coating due to solvents such as CMC during the preparation of battery slurry to pollute the lithium battery slurry, thereby ensuring the slurry quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the present invention.

[0035] Figure 2 Schematic diagram of the distribution of the coating in the present invention.

[0036] Wherein: 1. disc body; 2. multi-layer coating; 201. first sub-coating; 202. second sub-coating; 3. dispersed teeth. DETAILED DESCRIPTION

[0037] The specific implementation of the present invention is described below in conjunction with the accompanying drawings.

[0038] Embodiment 1:

[0039] like Figure 1-Figure 2 As shown, the method for making the coating dispersion disk of this embodiment comprises the following steps:

[0040] S1. The disc body 1 of the dispersion disc is manufactured by using an additive manufacturing process, so that the disc body 1 is integrally formed;

[0041] The manufacturing process of the disk body 1 includes the following steps:

[0042] S1.1. First, the Cx printing powder and the binder are kneaded and mixed to form granules using an additive manufacturing device to obtain printing particles;

[0043] In this embodiment, the additive manufacturing equipment is an SLM280 equipment;

[0044] During the manufacturing process, Cx materials have good dimensional stability, small deformation, excellent polishability and corrosion resistance;

[0045] S1.2. Then, the additive manufacturing device heats and melts the printing particles and ejects them from the nozzle, thereby performing layer printing;

[0046] During the layer printing process, the layer thickness of the additive manufacturing equipment is 30 μm, the layer thickness laser power of the additive manufacturing equipment is 200 W, the scanning speed of the additive manufacturing equipment is 720 mm / s, and the scanning spacing of the additive manufacturing equipment is 0.12 mm;

[0047] S1.3. Then, the additive manufacturing device forms the printed particles into the desired shape of the disc body 1 by layer printing, and after cooling and solidification, the disc body 1 made of Cx material is manufactured. At this time, the residual austenite content in the Cx material forming the disc body 1 is 18%-22%;

[0048] The disc body 1 is disc-shaped, a through hole is provided in the middle of the disc body 1, and dispersion teeth 3 are evenly arranged along the circumference of the edge of the disc body 1;

[0049] S1.4. Then, the disk body 1 obtained after cooling and solidification is subjected to a solution treatment, the solution holding temperature is 850°C, and the solution holding time is 30 minutes, so that the content of retained austenite in the Cx material forming the disk body 1 is reduced to ≤4%;

[0050] After the solution treatment is completed, the disk 1 needs to be air-cooled to room temperature;

[0051] S1.5. Finally, the disk body 1 after the solution treatment is subjected to aging treatment, the aging holding temperature is 525°C, and the aging holding time is 4 hours, so that the hardness of the disk body 1 reaches 50HRC, and the yield strength of the disk body 1 reaches 1600MPa;

[0052] After the aging treatment is completed, the disk 1 needs to be air-cooled to room temperature;

[0053] S2. Based on the physical vapor deposition method, an arc ion coating machine is used to form a multilayer coating 2 on the outer surface of the disk body 1, wherein the multilayer coating 2 includes at least four layers of a first sub-coating 201 and at least four layers of a second sub-coating 202, wherein the first sub-coating 201 and the second sub-coating 202 have the same number of layers and are alternately stacked in sequence;

[0054] The first sub-coating layer 201 is a CrN coating layer, and the second sub-coating layer 202 is a TiN coating layer;

[0055] The ratio of the thickness of the first sub-coating 201 to the thickness of the second sub-coating 202 is 1:2;

[0056] The first sub-coating 201 and the second sub-coating 202 are both crystalline structures without amorphous regions. Both CrN and TiN are face-centered cubic structures, so that the multilayer coating 2 has more interfaces than the single-layer coating, and has higher crack propagation resistance, wear resistance and mechanical strength. The lowest wear rate is 0.15×10 -11 m 3 / Nm, adhesion strength L is 53±1N, hardness is 1800HV-2500HV;

[0057] The manufacturing process of the multilayer coating 2 includes the following steps:

[0058] S2.1. First, the vacuum system of the arc ion plating machine is evacuated to make the coating environment pressure inside the arc ion plating machine reach 3.5×10 -3 Pa, and then introduce argon gas with a purity of 99.99% into the arc ion plating machine, so that the coating environment pressure inside the arc ion plating machine reaches 0.4Pa;

[0059] S2.2. Then, the arc ion plating machine generates a bias voltage, and the disc body 1 is cleaned by the bias voltage, thereby removing the pollutants on the outer surface of the disc body 1, and the cleaning time is 10min;

[0060] The amplitude of the bias voltage is 400V, and the frequency of the bias voltage is 42KHz;

[0061] S2.3. Finally, nitrogen gas with a purity of 99.99% is introduced into the arc ion plating machine so that the coating environment pressure inside the arc ion plating machine reaches 4 Pa. At the same time, the arc ignition system of the arc ion plating machine ignites the metal target arc to obtain metal plasma, and the metal plasma is deposited on the outer surface of the disk body 1, thereby forming a multi-layer coating 2;

[0062] The multilayer coating 2 is made of Cr / Ti alloy material with a purity of 99.99%;

[0063] During the metal plasma deposition process, the deposition temperature was 300 °C and the deposition time was 300 min;

[0064] The formed multilayer coating 2 has a dense columnar structure and can effectively adhere to the disk body 1. The multilayer coating 2 can effectively avoid the generation of sharp interfaces inside it, thereby improving its adhesion strength. In addition, the increase in the interfaces of the multilayer coating 2 can interrupt the growth of the grains and change the preferred orientation of the grains, so that the multilayer coating 2 with a larger number of bilayers has a finer grain size. These interfaces can generate stress fields to prevent the movement of dislocations at the interfaces, thereby improving the hardness of the multilayer coating 2. The multilayer coating 2 made of CrN / TiN material can reach a hardness of 1800HV.

[0065] Embodiment 2:

[0066] like Figure 1 As shown, based on a method for manufacturing a coating dispersion disk provided in Example 1, this embodiment provides a coating dispersion disk, including a disc-shaped disk body 1, a through hole is opened in the middle of the disk body 1, and dispersion teeth 3 are evenly arranged along the circumference of the edge of the disk body 1. The dispersion teeth 3 and the disk body 1 are integrally formed, and the outer surface of the dispersion teeth 3 and the disk body 1 are covered with multiple layers of coating 2 at the same time.

[0067] When the hardness of the coating is much greater than the hardness of the substrate, the coating is more likely to peel off and be scratched during service. For example, when the substrate is made of austenitic stainless steel with lower hardness, the coating covering the surface of the austenitic stainless steel is more likely to fall off. Therefore, using Cx as the substrate can ensure the adhesion between the multi-layer coating 2 and the disk body 1 in the present invention. Furthermore, increasing the thickness of the multi-layer coating 2 is more conducive to improving the hardness of the coating. In a preferred embodiment of the present invention, the total thickness of the multi-layer coating 2 is 9μm-14μm.

[0068] At present, the service environment temperature of the disperser disk in the lithium battery industry can reach above 300°C. The multilayer coating 2 has better adhesion strength and higher hardness, and an oxide layer can be formed on its surface. Therefore, covering the outer surface of the disk body 1 with the multilayer coating 2 is beneficial to improving the wear performance of the disperser disk at high temperatures; in addition, the multilayer coating 2 has multiple interfaces, thereby forming multiple barriers to prevent crack propagation, thereby reducing the wear rate of the disperser disk by crack deflection.

[0069] The above description is an explanation of the present invention, not a limitation of the present invention. The scope of the present invention is defined in the claims. Any form of modification may be made within the scope of protection of the present invention.

Claims

1. A method for manufacturing a coating dispersion disc, characterized in that: The steps include: The disc body (1) of the dispersion disc is manufactured using an additive manufacturing process, so that the disc body (1) is integrally formed; Based on a physical vapor deposition method, an arc ion coating machine is used to produce a multilayer coating (2) on the outer surface of a disk body (1), wherein the multilayer coating (2) comprises at least four layers of a first sub-coating (201) and at least four layers of a second sub-coating (202), wherein the first sub-coating (201) and the second sub-coating (202) have the same number of layers and are alternately stacked in sequence, wherein the first sub-coating (201) is a CrN coating and the second sub-coating (202) is a TiN coating.

2. The method for manufacturing a coating dispersion disk according to claim 1, characterized in that: The manufacturing process of the plate body (1) comprises the following steps: First, the Cx printing powder and the binder are kneaded and mixed to form granules using additive manufacturing equipment to obtain printing particles; Subsequently, the additive manufacturing device heats and melts the printing particles and ejects them from a nozzle, thereby performing layer printing; Then, the additive manufacturing device forms the required shape of the disc body (1) by printing the printed particles through layering, and after cooling and solidification, the disc body (1) made of Cx material is manufactured. At this time, the content of residual austenite in the Cx material forming the disc body (1) is 18%-22%; Next, the disk body (1) obtained after cooling and solidification is subjected to a solution treatment, the solution holding temperature is 850° C., and the solution holding time is 30 minutes, so that the content of retained austenite in the Cx material forming the disk body (1) is reduced to ≤4%; Finally, the disk body (1) after the solution treatment is subjected to aging treatment, with the aging holding temperature being 525° C. and the aging holding time being 4 h, so that the hardness of the disk body (1) reaches 50 HRC and the yield strength of the disk body (1) reaches 1600 MPa.

3. The method for making a coating dispersion disc according to claim 2, characterized in that: During the layer printing process, the layer thickness of the additive manufacturing equipment is 30μm, the layer thickness laser power of the additive manufacturing equipment is 200W, the scanning speed of the additive manufacturing equipment is 720mm / s, and the scanning spacing of the additive manufacturing equipment is 0.12mm.

4. The method for manufacturing a coating dispersion disk according to claim 2, characterized in that: After the solution treatment is completed, the plate (1) needs to be air-cooled to room temperature.

5. The method for manufacturing a coating dispersion disk according to claim 2, characterized in that: After the aging treatment is completed, the plate (1) needs to be air-cooled to room temperature.

6. The method for manufacturing a coating dispersion disk according to claim 1, characterized in that: The manufacturing process of the multilayer coating (2) comprises the following steps: First, the vacuum system of the arc ion plating machine is evacuated to make the coating environment pressure inside the arc ion plating machine reach 3.5×10 -3 Pa, and then introduce argon gas with a purity of 99.99% into the arc ion plating machine, so that the coating environment pressure inside the arc ion plating machine reaches 0.4Pa; Then, the arc ion plating machine generates a bias voltage, and the disc body (1) is cleaned by the bias voltage, and the cleaning time is 10 minutes, so as to remove pollutants on the outer surface of the disc body (1), the amplitude of the bias voltage is 400V, and the frequency of the bias voltage is 42KHz; Finally, nitrogen gas with a purity of 99.99% is introduced into the arc ion plating machine so that the coating environment pressure inside the arc ion plating machine reaches 4 Pa. At the same time, the arc ignition system of the arc ion plating machine ignites the metal target arc to obtain metal plasma, and the metal plasma is deposited on the outer surface of the disk body (1), thereby forming a multi-layer coating (2).

7. The method for manufacturing a coating dispersion disk according to claim 6, characterized in that: The multilayer coating 2 is made of a Cr / Ti alloy material with a purity of 99.99%.

8. The method for manufacturing a coating dispersion disk according to claim 1, characterized in that: During the metal plasma deposition process, the deposition temperature was 300°C and the deposition time was 300 min.

9. The method for manufacturing a coating dispersion disk according to claim 1, characterized in that: The ratio of the thickness of the first sub-coating (201) to the thickness of the second sub-coating (202) is 1:

2.

10. A coating dispersion disc manufactured based on the manufacturing method of the coating dispersion disc according to claim 1, characterized in that: The invention comprises a disc-shaped disc body (1), wherein a through hole is provided in the middle of the disc body (1), and dispersion teeth (3) are evenly arranged along the circumference of the edge of the disc body (1), wherein the dispersion teeth (3) and the disc body (1) are integrally formed, and the outer surfaces of the dispersion teeth (3) and the disc body (1) are simultaneously covered with a multi-layer coating (2).

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