Anti-oxidation low-wear heat-resistant turbine blade coating and preparation method thereof

Abstract

The invention provides an antioxidant low-wear heat-resistant turbine blade coating and a preparation method thereof, and relates to the technical field of material surface treatment. Comprising the following components in parts by mass: 20-30 parts of nickel-cobalt-chromium-aluminum-yttrium alloy, 30-40 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, 10-15 parts of hafnium powder and rhenium powder mixture, 5-10 parts of chromium sesquioxide, 3-5 parts of rare earth oxide, 2-4 parts of cerium dioxide, 3-5 parts of silicon dioxide, 5-8 parts of titanium carbide and 2-4 parts of zirconium boride. The nickel-cobalt-chromium-aluminum-yttrium alloy and the zirconium oxide-yttrium oxide-aluminum oxide composite ceramic are adopted, a stable oxidation film can be formed at a high temperature, further diffusion of oxygen is effectively prevented, rare earth oxide and cerium dioxide can promote repair and stability of the oxidation film, the oxidation resistance of the coating is improved, and the service life of the coating is prolonged. And the blade can keep good performance for a long time in a high-temperature environment.

Description

Technical Field

[0001] The present invention relates to the technical field of material surface treatment, and in particular to an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating and a preparation method thereof. Background Art

[0002] Steam turbines are key equipment for energy conversion and power output. Their blades operate under high temperature, high pressure, high speed, and corrosive media for long periods of time. These blades face multiple damage risks, including oxidation, wear, and thermal fatigue. Oxidation can cause scale to form on the blade surface, reducing its mechanical properties. Wear can reduce blade dimensional accuracy, affecting turbine efficiency. Thermal fatigue can cause blade cracks or even fractures, seriously threatening safe turbine operation. Therefore, blade coatings play a crucial role.

[0003] In the existing technology, traditional coatings include nickel-based alloys (NiCrAlY) and ceramic coatings (YSZ), which have the following main problems: Nickel-based coatings: high oxidation rate at high temperature (weight increase of 4.0 mg / cm after 100 hours of oxidation at 1000 ° C) 2 ), and its toughness is insufficient and it is prone to cracking; ceramic coating: the thermal expansion coefficient is greatly different from that of the substrate, and it is easy to peel off after 50 thermal shock cycles; composite coating: such as NiCrAlY / YSZ / TiC coating, its wear rate is high and its antioxidant performance is insufficient. Therefore, the present invention proposes an antioxidant, low-wear and heat-resistant turbine blade coating and its preparation method to solve the problems existing in the prior art. Summary of the Invention

[0004] In response to the above problems, the present invention proposes an antioxidant, low-wear, heat-resistant turbine blade coating and a preparation method thereof. The antioxidant, low-wear, heat-resistant turbine blade coating has strong antioxidant ability, enabling the blade to maintain good performance for a long time in a high-temperature environment.

[0005] To achieve the purpose of the present invention, the present invention is implemented through the following technical scheme: an oxidation-resistant, low-wear and heat-resistant turbine blade coating, comprising the following components in mass ratio: 20-30 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 30-40 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 10-15 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 5-10 parts of chromium oxide (Cr2O3), 3-5 parts of rare earth oxide, 2-4 parts of cerium dioxide (CeO2), 3-5 parts of silicon dioxide (SiO2), 5-8 parts of titanium carbide (TiC), and 2-4 parts of zirconium boride (ZrB2).

[0006] The further improvement is that it includes the following components in mass ratio: 25 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 35 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 12 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 8 parts of chromium oxide (Cr2O3), 4 parts of rare earth oxide, 3 parts of cerium dioxide (CeO2), 4 parts of silicon dioxide (SiO2), 6 parts of titanium carbide (TiC), and 3 parts of zirconium boride (ZrB2).

[0007] A further improvement is that the Al content in the nickel-cobalt-chromium-aluminum-yttrium alloy is 8-10%, and the Y content is 0.5-1.5%.

[0008] A further improvement is that: in the mixture of hafnium powder and rhenium powder, the mass ratio of hafnium powder to rhenium powder is 1:1.

[0009] A further improvement is that in the zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, the mass percentages of ZrO2, Y2O3, and Al2O3 are 87%:8%:5%, and the rare earth oxide is a mixture of La2O3 and Nd2O3 in a mass ratio of 2:1.

[0010] A method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating comprises the following steps:

[0011] S1: Micronize and dry the raw materials, then put them into a mixer for thorough mixing;

[0012] S2: adding an organic solvent and a binder to the mixed powder and stirring evenly to obtain a coating slurry;

[0013] S3: Plasma spraying is used to evenly coat the coating slurry on the surface of the turbine blade;

[0014] S4: After coating is completed, the blade is heat treated to tighten the coating.

[0015] A further improvement is that in S1, the nickel-cobalt-chromium-aluminum-yttrium alloy, hafnium powder and rhenium powder are ground separately to achieve a micron-level particle size; the zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, chromium oxide, rare earth oxide, cerium dioxide, silicon dioxide, titanium carbide and zirconium boride are dried to remove moisture, and when fully mixed in a mixer, the mixing time is controlled to 6-8 hours to ensure uniform distribution of the raw materials.

[0016] A further improvement is that in S2, an organic solvent and a binder are added to the mixed powder, the mass ratio of the organic solvent to the powder is controlled to be 2:1, the amount of the binder added is 4%-6% of the mass of the powder, and the mixture is stirred evenly to prepare a coating slurry with viscosity and fluidity.

[0017] A further improvement is that in S3, during spraying, the spraying power is controlled to be 30-40kW, the spraying distance is 100-120mm, and the powder feeding rate is 5-8g / min to ensure uniform coating thickness.

[0018] A further improvement is that: said S4 includes the following steps:

[0019] First, vacuum hot pressing is performed on the blades, with the holding time at 900-1100℃ for 2-3 hours and the pressure controlled at 20MPa;

[0020] Then, laser cladding was performed with a controlled wavelength of 1064nm, power of 3-4kW, and spot diameter of 3mm;

[0021] After completion, cool to room temperature to improve the density of the coating and its bonding strength with the blade substrate.

[0022] The beneficial effects of the present invention are:

[0023] 1. The present invention adopts nickel-cobalt-chromium-aluminum-yttrium alloy and zirconium oxide-yttrium oxide-aluminum oxide composite ceramics, which can form a stable oxide film at high temperature, effectively preventing the further diffusion of oxygen. Rare earth oxides and cerium dioxide can promote the repair and stabilization of the oxide film, improve the oxidation resistance of the coating, and enable the blade to maintain good performance for a long time in a high temperature environment.

[0024] 2. The present invention uses a mixture of titanium carbide, hafnium powder and rhenium powder, which has the characteristics of high hardness and high strength, and can enhance the wear resistance of the coating. Chromium trioxide can further improve the hardness and wear resistance of the coating, reduce the wear of the blades during operation, and extend the service life of the blades.

[0025] 3. The present invention uses zirconium boride and silicon dioxide, which have excellent high temperature resistance and thermal stability, can improve the thermal shock resistance of the coating and prevent the coating from cracking and peeling at high temperatures. At the same time, the composite ceramic material can also enhance the heat resistance of the coating, so that the coating can withstand the high temperature environment during the operation of the turbine.

[0026] 4. The present invention uses plasma spraying and subsequent heat treatment processes to form a good bond between the coating and the blade substrate, thereby improving the adhesion and anti-peeling ability of the coating, ensuring that the coating will not fall off during long-term use, and can effectively protect the turbine blades and improve the operating efficiency and reliability of the turbine. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Flowchart of the present invention. DETAILED DESCRIPTION

[0028] In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to the examples. The examples are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0029] Example 1

[0030] according to Figure 1 As shown, this embodiment proposes an oxidation-resistant, low-wear, and heat-resistant turbine blade coating, comprising the following components in mass ratio: 20 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 30 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 10 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 5 parts of chromium oxide (Cr2O3), 3 parts of rare earth oxide, 2 parts of cerium dioxide (CeO2), 3 parts of silicon dioxide (SiO2), 5 parts of titanium carbide (TiC), and 2 parts of zirconium boride (ZrB2).

[0031] Nickel-cobalt-chromium-aluminum-yttrium alloy is used as a bonding layer to improve bonding strength and initial oxidation resistance.

[0032] A mixture of hafnium powder and rhenium powder, chromium oxide and rare earth oxides are used as an anti-diffusion layer to inhibit the mutual diffusion of elements and delay the degradation of the coating.

[0033] Zirconia-yttria-alumina composite ceramics are used as the energy supply layer, which is resistant to high temperatures and has low wear.

[0034] Cerium dioxide and silicon dioxide are used as surface modification layers for nano-sealing to improve oxidation resistance.

[0035] The nickel-cobalt-chromium-aluminum-yttrium alloy has an Al content of 8-10% and a Y content of 0.5-1.5%. The hafnium powder and rhenium powder mixture has a mass ratio of 1:1. The zirconium oxide-yttria-aluminum oxide composite ceramic has a mass percentage of ZrO2, Y2O3, and Al2O3 of 87%:8%:5%. The rare earth oxide is a mixture of La2O3 and Nd2O3 in a mass ratio of 2:1.

[0036] A method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating comprises the following steps:

[0037] The raw materials are micronized and dried, and then placed in a mixer for thorough mixing. The nickel-cobalt-chromium-aluminum-yttrium alloy, hafnium powder, and rhenium powder are separately ground to a micron-level particle size. The zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, chromium oxide, rare earth oxides, cerium dioxide, silicon dioxide, titanium carbide, and zirconium boride are dried to remove moisture and thoroughly mixed in a mixer for 6-8 hours to ensure uniform distribution of the raw materials.

[0038] Adding an organic solvent and a binder to the mixed powder, stirring evenly to obtain a coating slurry; controlling the mass ratio of the organic solvent to the powder to be 2:1, and adding the binder in an amount of 4% to 6% of the mass of the powder, stirring evenly to prepare a coating slurry with viscosity and fluidity;

[0039] The coating slurry is evenly applied to the surface of the turbine blade using plasma spraying. During spraying, the spraying power is controlled at 30-40kW, the spraying distance is 100-120mm, and the powder feeding rate is 5-8g / min to ensure uniform coating thickness.

[0040] After coating, the blades undergo heat treatment to solidify the coating. This process involves vacuum hot-pressing the blades at 900-1100°C for 2-3 hours at a controlled pressure of 20 MPa. Laser cladding is then performed at a controlled wavelength of 1064 nm, a power of 3-4 kW, and a spot diameter of 3 mm. After completion, the blades are cooled to room temperature to improve the coating's density and adhesion to the blade substrate.

[0041] Example 2

[0042] according to Figure 1 As shown, this embodiment proposes an oxidation-resistant, low-wear, and heat-resistant turbine blade coating, comprising the following components in mass ratio: 25 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 35 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 12 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 8 parts of chromium oxide (Cr2O3), 4 parts of rare earth oxide, 3 parts of cerium dioxide (CeO2), 4 parts of silicon dioxide (SiO2), 6 parts of titanium carbide (TiC), and 3 parts of zirconium boride (ZrB2).

[0043] Nickel-cobalt-chromium-aluminum-yttrium alloy is used as a bonding layer to improve bonding strength and initial oxidation resistance.

[0044] A mixture of hafnium powder and rhenium powder, chromium oxide and rare earth oxides are used as an anti-diffusion layer to inhibit the mutual diffusion of elements and delay the degradation of the coating.

[0045] Zirconia-yttria-alumina composite ceramics are used as the energy supply layer, which is resistant to high temperatures and has low wear.

[0046] Cerium dioxide and silicon dioxide are used as surface modification layers for nano-sealing to improve oxidation resistance.

[0047] The nickel-cobalt-chromium-aluminum-yttrium alloy has an Al content of 8-10% and a Y content of 0.5-1.5%. The hafnium powder and rhenium powder mixture has a mass ratio of 1:1. The zirconium oxide-yttria-aluminum oxide composite ceramic has a mass percentage of ZrO2, Y2O3, and Al2O3 of 87%:8%:5%. The rare earth oxide is a mixture of La2O3 and Nd2O3 in a mass ratio of 2:1.

[0048] A method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating comprises the following steps:

[0049] The raw materials are micronized and dried, and then placed in a mixer for thorough mixing. The nickel-cobalt-chromium-aluminum-yttrium alloy, hafnium powder, and rhenium powder are separately ground to a micron-level particle size. The zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, chromium oxide, rare earth oxides, cerium dioxide, silicon dioxide, titanium carbide, and zirconium boride are dried to remove moisture and thoroughly mixed in a mixer for 6-8 hours to ensure uniform distribution of the raw materials.

[0050] Adding an organic solvent and a binder to the mixed powder, stirring evenly to obtain a coating slurry; controlling the mass ratio of the organic solvent to the powder to be 2:1, and adding the binder in an amount of 4% to 6% of the mass of the powder, stirring evenly to prepare a coating slurry with viscosity and fluidity;

[0051] The coating slurry is evenly applied to the surface of the turbine blade using plasma spraying. During spraying, the spraying power is controlled at 30-40kW, the spraying distance is 100-120mm, and the powder feeding rate is 5-8g / min to ensure uniform coating thickness.

[0052] After coating, the blades undergo heat treatment to solidify the coating. This process involves vacuum hot-pressing the blades at 900-1100°C for 2-3 hours at a controlled pressure of 20 MPa. Laser cladding is then performed at a controlled wavelength of 1064 nm, a power of 3-4 kW, and a spot diameter of 3 mm. After completion, the blades are cooled to room temperature to improve the coating's density and adhesion to the blade substrate.

[0053] Example 3

[0054] according to Figure 1As shown, this embodiment proposes an oxidation-resistant, low-wear, and heat-resistant turbine blade coating, comprising the following components in mass ratio: 30 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 40 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 15 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 10 parts of chromium oxide (Cr2O3), 5 parts of rare earth oxide, 4 parts of cerium dioxide (CeO2), 5 parts of silicon dioxide (SiO2), 8 parts of titanium carbide (TiC), and 4 parts of zirconium boride (ZrB2).

[0055] Nickel-cobalt-chromium-aluminum-yttrium alloy is used as a bonding layer to improve bonding strength and initial oxidation resistance.

[0056] A mixture of hafnium powder and rhenium powder, chromium oxide and rare earth oxides are used as an anti-diffusion layer to inhibit the mutual diffusion of elements and delay the degradation of the coating.

[0057] Zirconia-yttria-alumina composite ceramics are used as the energy supply layer, which is resistant to high temperatures and has low wear.

[0058] Cerium dioxide and silicon dioxide are used as surface modification layers for nano-sealing to improve oxidation resistance.

[0059] The nickel-cobalt-chromium-aluminum-yttrium alloy has an Al content of 8-10% and a Y content of 0.5-1.5%. The hafnium powder and rhenium powder mixture has a mass ratio of 1:1. The zirconium oxide-yttria-aluminum oxide composite ceramic has a mass percentage of ZrO2, Y2O3, and Al2O3 of 87%:8%:5%. The rare earth oxide is a mixture of La2O3 and Nd2O3 in a mass ratio of 2:1.

[0060] A method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating comprises the following steps:

[0061] The raw materials are micronized and dried, and then placed in a mixer for thorough mixing. The nickel-cobalt-chromium-aluminum-yttrium alloy, hafnium powder, and rhenium powder are separately ground to a micron-level particle size. The zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, chromium oxide, rare earth oxides, cerium dioxide, silicon dioxide, titanium carbide, and zirconium boride are dried to remove moisture and thoroughly mixed in a mixer for 6-8 hours to ensure uniform distribution of the raw materials.

[0062] Adding an organic solvent and a binder to the mixed powder, stirring evenly to obtain a coating slurry; controlling the mass ratio of the organic solvent to the powder to be 2:1, and adding the binder in an amount of 4% to 6% of the mass of the powder, stirring evenly to prepare a coating slurry with viscosity and fluidity;

[0063] The coating slurry is evenly applied to the surface of the turbine blade using plasma spraying. During spraying, the spraying power is controlled at 30-40kW, the spraying distance is 100-120mm, and the powder feeding rate is 5-8g / min to ensure uniform coating thickness.

[0064] After coating, the blades undergo heat treatment to solidify the coating. This process involves vacuum hot-pressing the blades at 900-1100°C for 2-3 hours at a controlled pressure of 20 MPa. Laser cladding is then performed at a controlled wavelength of 1064 nm, a power of 3-4 kW, and a spot diameter of 3 mm. After completion, the blades are cooled to room temperature to improve the coating's density and adhesion to the blade substrate.

[0065] According to Example 1, Example 2 and Example 3, it can be concluded that the coating of the present invention is prepared by the following mass ratio components: 20-30 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 30-40 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 10-15 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 5-10 parts of chromium oxide (Cr2O3), 3-5 parts of rare earth oxide, 2-4 parts of cerium dioxide (CeO2), 3-5 parts of silicon dioxide (SiO2), 5-8 parts of titanium carbide (TiC), and 2-4 parts of zirconium boride (ZrB2).

[0066] By rationally combining a variety of materials such as nickel-cobalt-chromium-aluminum-yttrium alloy, zirconium oxide-yttrium oxide-aluminum oxide composite ceramics, a mixture of hafnium powder and rhenium powder, chromium trioxide, rare earth oxides, cerium dioxide, silicon dioxide, titanium carbide and zirconium boride, and giving full play to the advantages of each material, a synergistic improvement in the coating's antioxidant, wear resistance and heat resistance is achieved. Compared with existing coating formulas, it has better comprehensive performance. A series of process steps, including raw material pretreatment, mixing and batching, coating slurry preparation, plasma spraying and post-processing, are adopted, and the parameters of each step are precisely controlled to ensure the quality and performance of the coating. In particular, the plasma spraying method can form a good bond between the coating and the blade substrate, and the heat treatment process improves the density and bonding strength of the coating. Experimental data show that the coating of the present invention is significantly better than uncoated blades in terms of antioxidant, wear resistance and heat resistance, and can effectively solve the problems existing in existing turbine blade coatings, providing a new and effective solution for the protection of turbine blades.

[0067] Verification example:

[0068]

[0069] The present invention utilizes a nickel-cobalt-chromium-aluminum-yttrium alloy and a zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, which can form a stable oxide film at high temperatures and effectively prevent further oxygen diffusion. Rare earth oxides and cerium dioxide promote the repair and stabilization of the oxide film, improving the coating's antioxidant capacity and enabling the blades to maintain good performance over time in high-temperature environments. Furthermore, the present invention utilizes a mixture of titanium carbide, hafnium powder, and rhenium powder, which exhibits high hardness and strength and can enhance the coating's wear resistance. Chromium trioxide further enhances the coating's hardness and wear resistance, reducing blade wear during operation and extending the blade's service life. Furthermore, the present invention utilizes zirconium boride and silicon dioxide, which exhibit excellent high-temperature resistance and thermal stability, enhancing the coating's resistance to thermal shock and preventing cracking and flaking at high temperatures. Furthermore, the composite ceramic material also enhances the coating's heat resistance, enabling it to withstand the high-temperature environment experienced during turbine operation. In addition, the present invention uses plasma spraying and subsequent heat treatment processes to form a good bond between the coating and the blade substrate, thereby improving the adhesion and anti-peeling ability of the coating, ensuring that the coating will not fall off during long-term use, and can effectively protect the turbine blades and improve the operating efficiency and reliability of the turbine.

[0070] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. An anti-oxidation, low-wear, and heat-resistant steam turbine blade coating, characterized in that: The invention comprises the following components in mass ratio: 20-30 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 30-40 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 10-15 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 5-10 parts of chromium oxide (Cr2O3), 3-5 parts of rare earth oxide, 2-4 parts of cerium dioxide (CeO2), 3-5 parts of silicon dioxide (SiO2), 5-8 parts of titanium carbide (TiC), and 2-4 parts of zirconium boride (ZrB2).

2. The oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 1, characterized in that: It includes the following components in mass ratio: 25 parts of nickel-cobalt-chromium-aluminum-yttrium alloy (Ni-Co-Cr-Al-Y), 35 parts of zirconium oxide-yttrium oxide-aluminum oxide composite ceramic (ZrO2-Y2O3-Al2O3), 12 parts of a mixture of hafnium powder and rhenium powder (Hf:Re), 8 parts of chromium oxide (Cr2O3), 4 parts of rare earth oxide, 3 parts of cerium dioxide (CeO2), 4 parts of silicon dioxide (SiO2), 6 parts of titanium carbide (TiC), and 3 parts of zirconium boride (ZrB2).

3. The oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 1, characterized in that: The Al content of the nickel-cobalt-chromium-aluminum-yttrium alloy is 8-10%, and the Y content is 0.5-1.5%.

4. The oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 1, characterized in that: In the mixture of hafnium powder and rhenium powder, the mass ratio of hafnium powder to rhenium powder is 1:

1.

5. The oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 1, characterized in that: In the zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, the mass percentages of ZrO2, Y2O3, and Al2O3 are 87%:8%:5%, and the rare earth oxide is a mixture of La2O3 and Nd2O3 in a mass ratio of 2:

1.

6. A method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating, applied to the oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to any one of claims 1 to 6, characterized in that: The following steps are involved: S1: Micronize and dry the raw materials, then put them into a mixer for thorough mixing; S2: adding an organic solvent and a binder to the mixed powder and stirring evenly to obtain a coating slurry; S3: Plasma spraying is used to evenly coat the coating slurry on the surface of the turbine blade; S4: After coating is completed, the blade is heat treated to tighten the coating.

7. The method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 6, characterized in that: In S1, the nickel-cobalt-chromium-aluminum-yttrium alloy, hafnium powder and rhenium powder are respectively ground to a micron-level particle size; the zirconium oxide-yttrium oxide-aluminum oxide composite ceramic, chromium oxide, rare earth oxides, cerium dioxide, silicon dioxide, titanium carbide and zirconium boride are dried to remove moisture, and are fully mixed in a mixer for a mixing time of 6-8 hours to ensure uniform distribution of the raw materials.

8. The method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 6, characterized in that: In S2, an organic solvent and a binder are added to the mixed powder, the mass ratio of the organic solvent to the powder is controlled to be 2:1, the amount of the binder added is 4%-6% of the mass of the powder, and the mixture is stirred evenly to prepare a coating slurry with viscosity and fluidity.

9. The method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 6, characterized in that: In S3, during spraying, the spraying power is controlled to be 30-40 kW, the spraying distance is 100-120 mm, and the powder feeding rate is 5-8 g / min to ensure uniform coating thickness.

10. The method for preparing an oxidation-resistant, low-wear, and heat-resistant steam turbine blade coating according to claim 6, characterized in that: The S4 comprises the following steps: First, vacuum hot pressing is performed on the blades, with the holding time at 900-1100℃ for 2-3 hours and the pressure controlled at 20MPa; Then, laser cladding was performed with a controlled wavelength of 1064nm, power of 3-4kW, and spot diameter of 3mm; After completion, cool to room temperature to improve the density of the coating and its bonding strength with the blade substrate.

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