Y2o3 suspension for plasma spraying, preparation method and application

Abstract

The application relates to the field of spraying technology, in particular to a Y2O3 suspension for plasma spraying, a preparation method and application, the Y2O3 suspension for plasma spraying comprises the following raw materials in mass ratio: 8-20% of a solvent, 1-3% of a surfactant, 10-40% of Y2O3 powder and the balance of water. The Y2O3 suspension can not only improve the bonding strength with a metal surface, cold and hot impact resistance, plasma etching resistance and other performances when being used for spraying of aluminum alloy, but also can improve the hardening resistance of the Y2O3 suspension.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of spraying technology, in particular to a Y2O3 suspension for plasma spraying, a preparation method and application. BACKGROUND

[0002] With the rapid development of 5G communication technology, Internet of Things, and artificial intelligence (AI), and the continuous expansion of the market for consumer electronic products such as smartphones and tablets, the demand for high-performance electronic materials is growing at an unprecedented rate. This trend not only promotes the progress of related industries, but also opens up broad prospects for the application of high-purity Y2O3 and its derivative materials in the electronics industry.

[0003] Traditional atmospheric plasma spraying (APS) of high-purity Y2O3 plasma-erosion-resistant coating has high porosity, the preparation process of Y2O3 powder for spraying is complex, and the cost of coating preparation is high. The suspension plasma spraying (SPS) directly feeds submicron or nanometer powder into the plasma jet in the form of a suspension. Because the powder size is reduced by more than one order of magnitude compared to the traditional APS method, the prepared Y2O3 coating has high density, uniform structure, high hardness, and strong plasma etching resistance. However, when used for spraying aluminum alloys, there are problems such as insufficient bonding strength and poor cold and hot impact resistance. SUMMARY

[0004] Therefore, the purpose of the present application is to provide a Y2O3 suspension for plasma spraying, a preparation method and application, so that the Y2O3 suspension can not only improve the bonding strength, cold and hot impact resistance, plasma etching resistance and other properties when used for spraying aluminum alloys, but also improve the hardening resistance of the Y2O3 suspension.

[0005] The present application solves the above technical problems by the following technical means:

[0006] A Y2O3 suspension for plasma spraying, comprising the following raw materials in mass ratio: 8-20% solvent, 1-3% surfactant, 10-40% Y2O3 powder, and the balance water.

[0007] According to the above technical means, by mixing Y2O3 powder with solvent, surfactant and water, Y2O3 suspension can be obtained. The raw materials are simple and easy to obtain. The Y2O3 suspension not only improves the bonding strength, cold and hot impact resistance, plasma etching resistance and other properties with the metal surface, but also improves the hardening resistance of the Y2O3 suspension.

[0008] As a preferred, the solvent is one or a combination of high-flash-point alcohol solvents and high-flash-point polyol solvents.

[0009] Further preferably, the high flash point alcohol solvent is an alcohol solvent with a flash point ≥ 95℃.

[0010] Further preferably, the alcohol solvent with a flash point ≥ 95℃ is a long-chain alcohol.

[0011] Further preferably, the long-chain alcohol is one or a combination of oleyl alcohol, trans-9-octadecenol, and 3-tetradecyne-1-ol.

[0012] Further preferably, the high flash point polyhydric alcohol solvent is a polyhydric alcohol solvent with a flash point ≥ 95℃.

[0013] Further preferably, the polyhydric alcohol solvent with a flash point ≥ 95℃ is one or a combination of diethylene glycol monobutyl ether, triethylene glycol dimethyl ether, PEG200, PEG400, PEG600, neopentyl glycol, and pentaerythritol.

[0014] According to the above technical means, by using an alcohol solvent or a polyhydric alcohol solvent with a flash point ≥ 95℃, not only is the suspension safer to transport and store, but after spraying, it also enhances the weather resistance and cold-heat shock resistance of the product.

[0015] As a preferred embodiment, the surfactant is a phosphate anionic surfactant.

[0016] Further preferably, the phosphate anionic surfactant is one or a combination of alkyl polyoxyethylene ether phosphate, alkyl phosphate, siloxane phosphate, and alkyl alcohol amide phosphate.

[0017] Further preferably, the phosphate anionic surfactant is alkyl phosphate.

[0018] Further preferably, the alkyl phosphate is one or a combination of alkyl phosphate monoester and alkyl phosphate diester.

[0019] Further preferably, the alkyl phosphate monoester is one or a combination of alkyl phosphate monoester sodium salt, alkyl phosphate monoester potassium salt, and alkyl phosphate monoester alcohol amine salt.

[0020] Further preferably, the alkyl phosphate diester is one or a combination of alkyl phosphate diester sodium salt, alkyl phosphate diester potassium salt, and alkyl phosphate diester alcohol amine salt.

[0021] According to the above technical means, by using alkyl phosphate as a surfactant, it has good corrosion inhibition, oxidation resistance, emulsification, chemical stability, and biodegradability, so that it can be mixed uniformly with other raw materials when used, improving the stability of the suspension; on the other hand, when used in products, it can improve the performance of the products.

[0022] Preferably, the Y2O3 powder has a particle size of 1-10 um.

[0023] Further preferably, the Y2O3 powder has a particle size of 2-6 um.

[0024] According to the above technical means, by using micron-sized Y2O3 powder, the Y2O3 powder can be more uniformly distributed in the suspension, thereby improving the density and structural uniformity during use, and cooperating with the solvent and surfactant to synergistically improve the corrosion resistance.

[0025] The application also discloses a preparation method of the Y2O3 suspension for plasma spraying.

[0026] The solvent and water are added into a container and stirred uniformly, and then the Y2O3 powder and the surfactant are added and stirred at high speed to obtain the Y2O3 suspension.

[0027] The application also discloses an application of the Y2O3 suspension for plasma spraying, which is used for preparing a Y2O3 coating on the surface of an aluminum alloy.

[0028] Preferably, the gas comprises argon, nitrogen and hydrogen, the content of the argon is 70-80%, and the contents of the nitrogen and hydrogen are both 10-15%.

[0029] Preferably, the voltage of the plasma torch is 140-155 V, and the current is 220 A.

[0030] According to the above technical means, by controlling the parameters of plasma spraying, a more dense and uniform coating can be formed on the surface of the aluminum alloy.

[0031] The application adopting the above scheme has the following beneficial effects:

[0032] 1. In the application, the Y2O3 suspension can be obtained by mixing the Y2O3 powder, the solvent, the surfactant and water, and the raw materials are simple and easy to obtain.

[0033] 2. In the present application, the alcohol solvent or polyol solvent with a flash point of 95℃ or more not only makes the suspension safer to transport and store, but also enhances the weather resistance, cold and hot impact resistance and other properties after spraying.

[0034] 3. In the present application, alkyl phosphate ester salt is used as a surfactant, which has good corrosion inhibition, oxidation resistance, emulsification, chemical stability and biodegradability. When used, on the one hand, it can be mixed uniformly with other raw materials to improve the stability of the suspension; on the other hand, when used in products, it can improve the performance of the products.

[0035] 4. The Y2O3 suspension in the present application has a simple preparation method, is easy to mass-produce, and can save processing costs when used by directly spraying Y2O3 suspension. BRIEF DESCRIPTION OF DRAWINGS

[0036] The present application can be further illustrated by the non-limiting examples shown in the accompanying drawings;

[0037] Figure 1 is a schematic diagram of the Y2O3 suspension for plasma spraying in the embodiment of the present application in a beam state. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application:

[0039] In the present application, the following raw materials are used:

[0040] The solvent is a mixture of oleyl alcohol and pentaerythritol, and the ratio of oleyl alcohol to pentaerythritol is 1:3.

[0041] The surfactant is a mixture of alkyl phosphate monoester triethanolamine salt and alkyl phosphate diester diethanolamine salt, and the ratio of alkyl phosphate monoester triethanolamine salt to alkyl phosphate diester diethanolamine salt is 2:1.

[0042] The particle size of Y2O3 powder is 2um, and the purity is 99% or more.

[0043] The water is deionized water.

[0044] Example 1, preparation of Y2O3 suspension for plasma spraying

[0045] Into a container, 2 parts by mass of oleyl alcohol and 6 parts by weight of pentaerythritol and 49 parts by weight of deionized water were added, stirred uniformly, then 40 parts by weight of Y2O3 powder, 2 parts by weight of alkyl phosphate monoester triethanolamine salt and 1 part by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain a Y2O3 suspension.

[0046] Example 2, Preparation of Y2O3 suspension for plasma spraying

[0047] Into a container, 2.5 parts by mass of oleyl alcohol and 7.5 parts by weight of pentaerythritol and 58.5 parts by weight of deionized water were added, stirred uniformly, then 30 parts by weight of Y2O3 powder, 1 part by weight of alkyl phosphate monoester triethanolamine salt and 0.5 part by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain a Y2O3 suspension.

[0048] Example 3, Preparation of Y2O3 suspension for plasma spraying

[0049] Into a container, 4 parts by mass of oleyl alcohol and 12 parts by weight of pentaerythritol and 60.8 parts by weight of deionized water were added, stirred uniformly, then 20 parts by weight of Y2O3 powder, 0.8 part by weight of alkyl phosphate monoester triethanolamine salt and 0.4 part by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain a Y2O3 suspension.

[0050] Example 4, Preparation of Y2O3 suspension for plasma spraying

[0051] Into a container, 5 parts by mass of oleyl alcohol and 15 parts by weight of pentaerythritol and 69 parts by weight of deionized water were added, stirred uniformly, then 10 parts by weight of Y2O3 powder, 0.67 part by weight of alkyl phosphate monoester triethanolamine salt and 0.33 part by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain a Y2O3 suspension.

[0052] Example 5 (Comparative Example 1), Preparation of Y2O3 suspension for plasma spraying

[0053] In this example, the solvent is oleyl alcohol.

[0054] Into a container, 10 parts by mass of oleyl alcohol and 58.5 parts by weight of deionized water were added, stirred uniformly, then 30 parts by weight of Y2O3 powder, 1 part by weight of alkyl phosphate monoester triethanolamine salt and 0.5 part by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain a Y2O3 suspension.

[0055] Example 6 (Comparative Example 2), Preparation of Y2O3 suspension for plasma spraying

[0056] In this example, the solvent is pentaerythritol.

[0057] 10 parts by mass of pentaerythritol and 58.5 parts by weight of deionized water were added into a container and stirred uniformly, then 30 parts by weight of Y2O3 powder, 1 part by weight of alkyl phosphate monoester triethanolamine salt and 0.5 part by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain the Y2O3 suspension.

[0058] Example 7 (Comparative Example 3), Preparation of Y2O3 suspension for plasma spraying

[0059] In this example, the solvent is PEG400 and the surfactant is alkyl phosphate monoester triethanolamine salt

[0060] 10 parts by mass of PEG400 and 58.5 parts by weight of deionized water were added into a container and stirred uniformly, then 30 parts by weight of Y2O3 powder, 1.5 parts by weight of alkyl phosphate monoester triethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain the Y2O3 suspension.

[0061] Example 8 (Comparative Example 4), Preparation of Y2O3 suspension for plasma spraying

[0062] In this example, the solvent is oleyl alcohol and the surfactant is alkyl phosphate monoester triethanolamine salt

[0063] 10 parts by mass of oleyl alcohol and 58.5 parts by weight of deionized water were added into a container and stirred uniformly, then 30 parts by weight of Y2O3 powder, 1.5 parts by weight of alkyl phosphate monoester triethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain the Y2O3 suspension.

[0064] Example 9 (Comparative Example 5), Preparation of Y2O3 suspension for plasma spraying

[0065] In this example, the solvent is oleyl alcohol and the surfactant is alkyl phosphate diester diethanolamine salt

[0066] 10 parts by mass of oleyl alcohol and 58.5 parts by weight of deionized water were added into a container and stirred uniformly, then 30 parts by weight of Y2O3 powder, 1.5 parts by weight of alkyl phosphate diester diethanolamine salt were added, stirred at a speed of 600 r / min for 12 min to obtain the Y2O3 suspension.

[0067] Example 10, Application of Y2O3 suspension in plasma spraying

[0068] Aluminum alloy as the base, the aluminum alloy base is the aluminum alloy after surface cleaning, using Y2O3 suspension in example 1-4, plasma spraying on the surface of aluminum alloy to prepare Y2O3 coating with thickness of 200-300 μm:

[0069] The feeding rate of Y2O3 suspension into the plasma jet is 45 ml / min, the spraying distance is 90 mm, and the enthalpy value of the plasma spray gun is 8. The 100HE plasma spray gun produced by Progressive Surface is used, the voltage of the spray gun is 141-152 V, the current is 220 A, the working power of the spray gun is 31-33 kW, and the plasma gas flow rate is: Ar 171.5 L / min, H2 36.75 L / min, N2 36.75 L / min.

[0070] After the Y2O3 suspension in examples 1-4 is sprayed by the spraying method in example 10, the coating is tested, and the following items are tested:

[0071] Bonding strength, technical requirements, using pull-off method to test the bonding strength of the coating, the average bonding strength is ≥14 MPa;

[0072] Corrosion resistance, technical requirements, 5% HCl solution, room temperature environment (23-25℃), soaking for 4h without any continuous bubble phenomenon;

[0073] Coating density, technical requirements, APS average porosity <2.5%, SPS average porosity <1%;

[0074] Coating hardness, technical requirements, testing the Vickers hardness of the coating cross section, and the average coating hardness is required to be >4GPa (409.6HV);

[0075] Coating thickness, technical requirements, the average total thickness of the coating is 200-300 μm;

[0076] Cold and hot impact, technical requirements, the test piece is baked at 200℃ for 30 minutes, then quickly put into room temperature water, and repeated for 30 times of cold and hot impact, then the bonding strength of the coating is tested by using pull-off method, and the average bonding strength is ≥10 MPa;

[0077] Voltage breakdown resistance, technical requirements, according to the method of ASTM D149, using voltage breakdown tester to test the breakdown voltage resistance of the coating, and the breakdown voltage resistance of the coating is required to be not less than 500V / mil (25000V / mm), that is, the coating thickness is between 200 μ-300 μ, and the breakdown voltage resistance is 5000V-7500V;

[0078] Plasma etching resistance (μ / hr), technical requirements, resistance to etching in vacuum / fluoride atmosphere;

[0079] The test results are shown in Table 1:

[0080] Table 1 Test results

[0081] Item Example 1 Example 2 Example 3 Example 4 Bond strength / MPa 14.5 15.3 14.9 14.3 Corrosion resistance No continuous bubble out No continuous bubble out No continuous bubble out No continuous bubble out Coating density sps = 0.92% sps = 0.86% sps = 0.91% sps = 0.94% Coating hardness 409.6 HV 412.6 HV 410.3 HV 407.8 HV Coating thickness 268 um 268 um 272 um 269 um Cold thermal shock performance 10.8 MPa 11.1 MPa 10.5 MPa 10.1 MPa Voltage breakdown resistance 7200V 6800V 6100V 5200V Plasma etch resistance (μ / hr) 0.45 μ 0.48 μ 0.53 μ 0.59 μ

[0082] According to the above data, it can be seen that the Y2O3 suspension prepared in Examples 1-4 has good bonding strength, corrosion resistance, cold and hot impact resistance, voltage breakdown resistance and plasma etching resistance on the surface of the aluminum alloy, and at the same time, after spraying, the compactness, thickness and hardness of the coating can meet the requirements. Relatively speaking, in terms of bonding strength, coating compactness, coating hardness, impact resistance and voltage breakdown resistance, the Y2O3 suspension ratio in Example 2 is relatively better, and in terms of corrosion resistance and coating thickness, there is little difference between each example.

[0083] After the Y2O3 suspension in Examples 5-9 is sprayed by the spraying method in Example 10, the coating is tested, and the test items are the same as those in Examples 1-4. The test results are shown in Table 2:

[0084] Table 2 Test results

[0085] Item Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Bond strength / MPa 14.1 14.1 14.2 14.1 14.1 Corrosion resistance No continuous bubble out No continuous bubble out Bubble out Bubble out Bubble out Coating density sps = 0.99% sps = 0.98% sps = 0.95% sps = 0.99% sps = 0.99% Coating hardness 399.2 HV 406.7 HV 378.4 HV 367.9 HV 367.8 HV Coating thickness 267 um 269 um 271 um 270 um 273 um Cold thermal shock performance 9.6 MPa 10.0 MPa 9.9 MPa 9.2 MPa 9.2 MPa Voltage breakdown resistance 5000V 5100V 4300V 4500V 4500V Plasma etch resistance (μ / hr) 0.68 μ 0.65 μ 0.73 μ 0.75 μ 0.75 μ

[0086] According to the above data, compared with Example 2, in Comparative Examples 1-2, since only oleyl alcohol or pentaerythritol is used as the solvent, the coating has a slight decrease in bonding strength, coating compactness and coating thickness, but the decrease is not very obvious, and in terms of corrosion resistance, there is no obvious change, but in terms of coating hardness and cold and hot impact resistance, voltage breakdown resistance and plasma etching resistance, there is a decrease, which shows that by using oleyl alcohol and pentaerythritol in combination, the coating hardness and cold and hot impact resistance, voltage breakdown resistance and plasma etching resistance of the coating can be synergistically improved.

[0087] According to the above data, compared with Example 2, in Comparative Examples 3-5, when other solvents or only one surfactant is used, the coating has a decrease in bonding strength, coating compactness, coating thickness, corrosion resistance, coating hardness and cold and hot impact resistance, voltage breakdown resistance and plasma etching resistance, which shows that by using two surfactants and two solvents in combination, the performance of the coating can be synergistically improved

[0088] The Y2O3 suspension for plasma spraying, the preparation method and the application provided by the present application are described in detail above. The description of the specific embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

[0089] It should be particularly pointed out that, if the specific experimental steps or conditions are not indicated in the examples, the operations or conditions can be performed according to the conventional experimental steps described in the literature in the field. If the reagents or instruments are not indicated by the manufacturers, they are all conventional reagent products that can be obtained by purchase.

[0090] The above examples are for better understanding of the present application and are not limited to the best embodiments, and do not limit the content and protection scope of the present application. Any person who obtains any product identical or similar to the present application under the inspiration of the present application or by combining the present application with other existing technical features falls within the protection scope of the present application.

Claims

1. A Y2O3 suspension for plasma spraying, characterized in that, The raw material comprises the following quality ratio: 8-20% solvent, 1-3% surfactant, 10-40% Y2O3 powder and the rest water; the solvent is a mixture of oleyl alcohol and pentaerythritol, the mass ratio of oleyl alcohol and pentaerythritol is 1:3; the surfactant is a mixture of alkyl phosphate monoester triethanolamine salt and alkyl phosphate diester diethanolamine salt, the mass ratio of alkyl phosphate monoester triethanolamine salt and alkyl phosphate diester diethanolamine salt is 2:

1.

2. The Y203 suspension for plasma spraying according to claim 1, characterized in that, The particle size of the Y2O3 powder is 1-10 um.

3. A method for the preparation of a Y2O3 suspension for plasma spraying according to any one of claims 1-2, characterized in that, The preparation method is specifically as follows: The solvent and water are added into a container and stirred uniformly, then the Y2O3 powder and the surfactant are added and stirred at high speed to obtain a Y2O3 suspension.

4. Use of a Y2O3 suspension for plasma spraying according to any one of claims 1 to 2, characterized in that The Y2O3 suspension is used for spraying on the surface of an aluminum alloy to prepare a Y2O3 coating, and the process parameters of the plasma spraying are as follows: the working power of the plasma spraying gun is 30-35 kW, the enthalpy value of the plasma spraying gun is 7-10, the spraying distance is 80-100 mm, the feeding rate is 40-50 ml / min, and the total amount of gas is 240-250 L / min.

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