An anti-cavitation wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating and a preparation method thereof

Abstract

A cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating is disclosed. The composite coating material comprises the following components by mass percentage: 15%–65% WC powder, 0.5%–3% TaC powder, 0.2%–1% rare earth oxide powder, and 31%–84.3% FeCrNiAlTi alloy powder. This invention utilizes laser cladding to prepare the FeCrNiAlTi high-entropy alloy / ceramic composite coating, which exhibits a metallurgical bond with the substrate. The coating is dense and uniform, with a porosity below 0.15%, essentially pore-free. The microhardness is increased to 350–580 HV. Under the same cavitation erosion test parameters, the coating's cavitation erosion resistance after 20 hours is 2.0–11.2 times that of the substrate. In wear tests, the volumetric wear rate of the coating after 2 hours is 1.0 × 10⁻⁶. ‑5 mm 3 ·N ‑1 ·m ‑1 ~1.28×10 ‑5 mm 3 ·N ‑1 ·m ‑1 Compared to stainless steel substrates, the corrosion resistance is reduced to 43.3-75%, offering the dual advantages of cavitation resistance and wear resistance.

Description

Technical Field

[0001] This invention relates to a cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating and its preparation method, belonging to the field of composite coating material technology. Background Technology

[0002] Cavitation erosion is the most common failure mode of flow-through components such as turbines, pumps, and ship propellers. When the local pressure of a fluid drops below its saturated vapor pressure, vapor-filled cavitation bubbles are generated inside the fluid or at the liquid-solid interface. These bubbles then grow and collapse due to changes in the flow field environment, a process known as cavitation. The instantaneous collapse of these bubbles releases intense microjets and shock waves. When these microjets and shock waves act on the material surface, they generate highly localized stress. The repeated collapse of countless bubbles causes the material surface to be subjected to microjets and shock waves, ultimately leading to localized fatigue and spalling of the material surface. This surface wear caused by cavitation bubble collapse is called cavitation erosion. For a long time, cavitation erosion has been prevalent in hydropower, marine machinery, and offshore platforms, directly causing premature failure of flow-through components such as turbines, pumps, and ship propellers, as well as core components in direct contact with the fluid. In some extreme silty environments, cavitation erosion and wear can interact, seriously jeopardizing the stable operation of equipment. Cavitation and wear not only severely affect power generation efficiency, shorten unit maintenance cycles, increase maintenance complexity, and cause huge economic losses, but also threaten the operational safety of hydropower stations.

[0003] Currently, common technical means to solve cavitation erosion and wear include: using materials with excellent cavitation erosion and wear resistance, coating the substrate surface with organic coatings, supersonic flame spraying, and laser cladding.

[0004] High-entropy alloys have attracted widespread attention in the materials science community due to their excellent ductility, high strength, high hardness, and good wear and corrosion resistance, making them a research hotspot. The properties of high-entropy alloys stem from the synergistic effect of their various constituent elements, resulting in significant advantages in overall performance compared to traditional alloys. This provides a new approach to solving the problems of cavitation erosion and wear on hydraulic equipment blades. In practical applications, cavitation resistance requires materials to possess a certain degree of toughness to buffer the impact force of microjets. However, in existing technologies, there is an inherent contradiction between cavitation resistance and wear resistance in high-entropy alloys: cavitation resistance requires high toughness to absorb the impact load generated by cavitation collapse, while wear resistance depends on high hardness to resist abrasive cutting. Increasing hardness often leads to increased brittleness, thus reducing cavitation resistance, and vice versa. Therefore, how to achieve synergistic optimization of hardness and toughness is a key problem that urgently needs to be solved in this field.

[0005] For example, patent CN115505816A discloses a cavitation erosion resistant Fe-based high-entropy alloy powder and its coating. The coating prepared by laser cladding has excellent cavitation erosion resistance. However, since it is a single high-entropy alloy system, it mainly relies on solid solution strengthening and lattice distortion effect, and lacks an effective hard phase strengthening mechanism. Therefore, its wear resistance is not significantly improved compared with the base material.

[0006] Laser cladding, as a commonly used coating preparation technology, still faces many technical challenges in the preparation of high-entropy alloy composite coatings. For example, under the action of high-energy-density lasers, hard phases such as WC are prone to decomposition, leading to the failure of the reinforcing phase; the thermal stress generated by rapid heating and cooling during cladding can easily cause coating cracking; insufficient fluidity of the molten pool makes it difficult to remove pores and inclusions, becoming preferential sites for cavitation erosion damage; and the microstructure segregation problem caused by uneven element distribution in multi-component systems can all seriously affect the overall performance of the coating.

[0007] Furthermore, existing laser cladding technology cannot simultaneously achieve excellent cavitation resistance and wear resistance in the same system. There is an urgent need to construct a composite coating system with both high hardness and high toughness through synergistic optimization of composition design and process control. Summary of the Invention

[0008] To overcome the shortcomings of existing technologies, this invention provides a cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating and its preparation method. By introducing WC, TaC and rare earth oxides, a high-entropy alloy / ceramic composite coating is prepared using laser cladding technology, achieving multi-scale strengthening and microstructure control, thereby breaking through the technical bottleneck of the existing technology where it is difficult to simultaneously achieve cavitation resistance and wear resistance.

[0009] The technical solution adopted by this invention to solve its technical problem is: A cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating, wherein the composite coating material comprises the following components in the following mass percentages: WC powder 15%~65%, TaC powder 0.5~3%, rare earth oxide powder 0.2~1%, and FeCrNiAlTi alloy powder 31%~84.3%.

[0010] The aforementioned cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating, wherein the FeCrNiAlTi alloy powder has the following composition by atomic percentage: Cr: 20~35%, Ni: 15~35%, Al: 3~8%, Ti: 3~8%, Fe: balance.

[0011] In the aforementioned cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating, the rare earth oxide powder has a particle size of 100 nm, and the other powders have a particle size of 3~45 μm.

[0012] The rare earth oxides in the aforementioned cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating include one or both of CeO2 and La2O3.

[0013] A method for preparing a cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating, the method comprising the following steps: Step 1: Prepare Fe, Cr, Ni, Al, and Ti powders according to the following atomic ratio: Cr: 20~35%, Ni: 15~35%, Al: 3~8%, Ti: 3~8%, Fe: balance. Obtain FeCrNiAlTi alloy powder by ball milling or other powder mixing equipment. Step 2: Mix WC powder, TaC powder, rare earth oxide powder and FeCrNiAlTi alloy powder prepared in Step 1 according to the formula content to form FeCrNiAlTi high entropy alloy / ceramic composite powder by mechanical mixing. Step 3: Spread the powder prepared above evenly and dry the material at a temperature of 100~120℃ for 2~4 hours; Step 4: Clean the substrate surface with alcohol and dry it at 50~60 ℃ to remove oil stains and dirt from the surface; Step 5: Set up a laser cladding process to clad the dried FeCrNiAlTi high-entropy alloy / ceramic composite powder onto the substrate surface to obtain a high-entropy alloy / ceramic composite coating.

[0014] The above-mentioned method for preparing the cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating, wherein the thickness of the high-entropy alloy / ceramic composite coating is 1~2mm.

[0015] The laser cladding process parameters for the above-mentioned cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating are as follows: spot diameter of 3.5~6.5 mm, laser power of 2.6~4.5 kW, overlap rate of 40~60%, cladding head scanning speed of 6~30 mm / s, and powder feeding rate of 15~100 g / min.

[0016] The beneficial effects of this invention are: This invention optimizes the powder composition and preparation process of the FeCrNiAlTi high-entropy alloy / ceramic composite coating. The FeCrNiAlTi high-entropy alloy / ceramic composite coating, prepared by laser cladding, exhibits a metallurgical bond with the substrate. The coating is dense and uniform, with a porosity below 0.15%, essentially pore-free. The microhardness is increased to 350-580 HV. Under the same test parameters, the cavitation erosion resistance of the substrate coated with the composite coating is reduced to 1.1-8.5 mg after 20 hours, demonstrating cavitation erosion resistance 2.0-11.2 times that of the pure substrate (ZG04Cr13Ni5Mo stainless steel), effectively solving the problem of WC particle spalling under impact. In wear tests, the volumetric wear rate of the coating after 2 hours is 1.0 × 10⁻⁶. -5 mm 3 ·N -1 ·m -1 ~1.28×10 -5 mm 3 ·N -1 ·m -1 Compared to the stainless steel substrate (ZG04Cr13Ni5Mo martensitic stainless steel), the viscosity is reduced to 43.3-75%. Furthermore, the coating's preparation process is reliable and its performance is stable, making it suitable not only for turbine flow components but also for applications in pumps, ship propellers, and other flow components that come into direct contact with fluids. Attached Figure Description

[0017] Figure 1 The microstructure of the FeCrNiAlTi high-entropy alloy / ceramic composite coating obtained in Examples 1-3 of this invention is shown in the cross-sectional microstructure diagram. Figure 2 This is a SEM image of the high-entropy alloy / ceramic composite coating after cavitation erosion in Example 1. Figure 3 This is a SEM image of the high-entropy alloy / ceramic composite coating after cavitation erosion in Example 2. Figure 4 This is a SEM image of the high-entropy alloy / ceramic composite coating after cavitation erosion in Example 3. Detailed Implementation

[0018] The FeCrNiAlTi high-entropy alloy coating substrate of this invention is composed of BCC and a small amount of FCC phase. WC, TaC, CeO2, and La2O3 powders are introduced into the high-entropy alloy to form a composite coating consisting of BCC, FCC, WC, TaC, W2C, and W... C1-x M 23 A multi-component composite reinforcement system composed of C6 and other components. The addition of TaC not only provides extremely high hardness support, but also, due to its superior thermal stability compared to WC, it can form a composite hard skeleton with WC, effectively suppressing the burning and shedding of the hard phase during laser cladding, and enhancing the coating's resistance to cutting by hard mud and sand.

[0019] In this invention, CeO2 and / or La2O3 rare earth oxide powders are added to the coating. Rare earth oxides possess strong surface activity, which can reduce the surface tension of the molten metal in the molten pool during laser cladding, improving the flowability of the molten pool. This facilitates the removal of gases and inclusions, increases the coating density, and reduces porosity (to below 0.15%), significantly reducing the probability of cavitation initiation at defects during the cavitation erosion stage. Furthermore, during solidification, rare earth elements can act as heterogeneous nucleation sites, promoting grain refinement and inhibiting dendrite coarsening. Additionally, the segregation of rare earth elements at grain boundaries can purify the grain boundaries, improve interfacial bonding strength, and enhance the bond between the ceramic strengthening phases (WC, TaC) and the high-entropy alloy matrix, thereby reducing the tendency of the hard phase to detach under cavitation erosion.

[0020] In this invention, by controlling the content of rare earth oxides and combining the rapid heating and cooling characteristics of laser cladding process, comprehensive regulation of molten pool behavior, microstructure and interface state is achieved, so that the resulting coating has good anti-cavitation performance, high wear resistance and structural stability.

[0021] This invention achieves the matching and optimization of cavitation resistance and wear resistance through the synergistic effect of component design and laser cladding process parameters, thereby obtaining better overall performance.

[0022] When FeCrNiAlTi high-entropy alloy is combined with WC and TaC ceramic materials, WC and TaC undergo minor decomposition in the molten pool, allowing W, Ta, and C atoms to dissolve into the FeCrNiAlTi binder phase of the high-entropy alloy, resulting in solid solution strengthening. C atoms also precipitate M atoms in situ from the matrix elements. 23 C6 type metal carbides play a role in refining the microstructure, achieving both grain refinement and second-phase reinforcement, and synergistically improving strength and toughness.

[0023] In this invention, the WC hard phase in the composite coating primarily resists wear, while the high-melting-point TaC powder cannot be completely melted during laser cladding. The undissolved TaC acts as a heterogeneous nucleation agent, achieving the goal of refining the microstructure. The nano-rare earth oxide powder has a strong effect on purifying grain and phase boundaries, improving the interfacial bonding strength between the WC hard phase and the FeCrNiAlTi binder phase, and reducing cavitation erosion damage. Adjusting the TaC and rare earth oxide content allows for the control of the overall performance of the composite coating in terms of cavitation erosion resistance and wear resistance.

[0024] This invention limits the TaC powder content to 0.5-3%. When the TaC content is below 0.5%, the insufficient amount of hard phase makes it difficult to form an effective reinforcing framework structure, limiting the strengthening effect of the second phase. Simultaneously, the number of heterogeneous nucleation sites decreases, resulting in insignificant grain refinement and limited improvement in coating hardness and wear resistance. When the TaC content is in the range of 0.5-3%, a dispersed hard reinforcing phase can be formed in the high-entropy alloy matrix. This provides high hardness support while achieving a synergistic effect of strength and toughness through grain refinement, improving the coating's cavitation erosion resistance and wear resistance. When the TaC content exceeds 3%, the ceramic phase ratio is too high, easily forming a continuous or semi-continuous brittle phase network in the coating. Furthermore, due to the significant difference in thermal expansion coefficients between the ceramic phase and the metal matrix, large thermal stress is easily generated during the rapid cooling process of laser cladding, leading to coating cracking or a decrease in interfacial bonding strength, thereby reducing cavitation erosion resistance.

[0025] This invention limits the content of rare earth oxide powder to 0.2% to 1%. When the rare earth oxide content is below 0.2%, its surface activity is insufficient, making it difficult to significantly improve the fluidity and purification effect of the molten pool. This results in the ineffective removal of pores and inclusions, poor coating density, and a tendency to become the initiation site for cavitation erosion damage. When the rare earth oxide content is in the range of 0.2% to 1%, it can effectively reduce the surface tension of the molten pool, improve fluidity, promote gas escape, and at the same time purify grain boundaries and refine the microstructure, thereby significantly improving the coating density and cavitation erosion resistance. When the rare earth oxide content exceeds 1%, it is prone to agglomeration to form inclusion phases, which disrupts the continuity of the matrix, reduces the interfacial bonding strength, and may become a crack source, thus hindering the improvement of the overall performance of the coating.

[0026] This invention utilizes laser cladding technology to clad FeCrNiAlTi high-entropy alloy / ceramic composite material onto the surface of a stainless steel substrate to form a composite coating. The high cooling rate of laser cladding, combined with TaC, CeO2, and other non-uniform nucleation particles, significantly refines the coating grains, transforming the microstructure from coarse dendrites to uniform and fine equiaxed grains. Based on the Hall-Page effect, this also improves the coating's hardness and impact toughness.

[0027] To make the technical problems, solutions, and beneficial effects of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0028] In this embodiment of the invention, the substrate for spraying can be ZG04Cr13Ni5Mo stainless steel.

[0029] In the following examples, the FeCrNiAlTi alloy powder was prepared by ball milling Fe, Cr, Ni, Al, and Ti powders in the following atomic ratio: Cr: 25%, Ni: 20%, Al: 5%, Ti: 5%, Fe: 45%. Example 1

[0030] (1) Ingredients: Take the following components by mass ratio: WC powder: 15%, TaC powder: 0.5%, CeO2 powder: 0.5%, FeCrNiAlTi alloy powder: 83.5%, and prepare high-entropy alloy / ceramic composite powder by mechanical mixing. (2) Drying: Place the high-entropy alloy / ceramic composite powder flat and dry it in an insulated box at 100℃ for 4 hours. (3) Substrate pretreatment: Clean the substrate surface with alcohol and dry it at 50°C to remove oil stains and dirt from its surface. (4) Laser cladding process parameters: spot diameter is 5mm, laser power is 2.6kW, overlap rate is 50%, cladding head scanning speed is 10mm / s, powder feeding rate is 30g / min.

[0031] (5) Performance Results: The prepared high-entropy alloy / ceramic composite coating had a thickness of 1.6 mm, a porosity of <0.6%, and a microhardness of 345 HV. Under the same cavitation erosion test parameters, the coating's cavitation erosion resistance after 20 h was 2.07 times that of the substrate (cavitation erosion weight loss of the coating was 0.0073 g, while that of the substrate (ZG04Cr13Ni5Mo steel) was 0.01513 g). In the wear test, the volumetric wear rate of the coating after 2 h was reduced to 50.8% compared to the substrate (volume loss rate of the coating after 2 h: 1.28 × 10⁻⁶). -5 mm 3 ·N -1 ·m -1 Matrix volume loss rate over 2 hours: 2.52 × 10⁻⁶ -5 mm 3 ·N -1 ·m -1 Composite coating structure such as Figure 1 As shown in (a), the cavitation morphology is as follows: Figure 2 As shown. Example 2

[0032] (1) Ingredients: Take the following components by mass ratio: WC powder: 30%, TaC powder: 1%, La2O3 powder: 0.5%, FeCrNiAlTi alloy powder: 68.5% to prepare high-entropy alloy / ceramic composite powder; (2) Drying: Place the high-entropy alloy / ceramic composite powder flat and dry it in an insulated box at 120°C for 2 hours. (3) Substrate pretreatment: Clean the substrate surface with alcohol and dry it at 60°C to remove oil stains and dirt from its surface. (4) Laser cladding process parameters: spot diameter is 5 mm, laser power is 3.4 kW, overlap rate is 50%, cladding head scanning speed is 15 mm / s, powder feeding rate is 70 g / min.

[0033] (5) Performance Results: The prepared high-entropy alloy / ceramic composite coating was 1.4 mm thick. Testing showed that the coating had a porosity of <0.6% and a microhardness of 455 HV. Under the same cavitation erosion test parameters, the coating's cavitation erosion resistance after 20 hours was 2.59 times that of the substrate ZG04Cr13Ni5Mo stainless steel (cavitation erosion weight loss of the coating was 0.00584 g, while that of the substrate ZG04Cr13Ni5Mo stainless steel was 0.01513 g). In the wear test, the volume loss rate of the coating after 2 hours was reduced to 48% compared to the substrate (coating: 1.21 × 10⁻⁶). -5 mm 3 ·N -1 ·m -1 Matrix: 2.52×10 -5 mm 3 ·N -1 ·m -1 Composite coating structure such as Figure 1 As shown in (b), the cavitation morphology is as follows: Figure 3 As shown. Example 3

[0034] (1) Ingredients: Take the following components by mass ratio: WC powder: 45%, TaC powder: 1%, La2O3 powder: 0.5%, FeCrNiAlTi alloy powder: 53.5% to prepare high-entropy alloy / ceramic composite powder; (2) Drying: Place the high-entropy alloy / ceramic composite powder flat and dry it in an insulated box at 100℃ for 2 hours. (3) Substrate pretreatment: Clean the substrate surface with alcohol and dry it at 60°C to remove oil stains and dirt from its surface. (4) Laser cladding process parameters: spot diameter is 5mm, laser power is 3.0kW, overlap rate is 50%, cladding head scanning speed is 18mm / s, powder feeding rate is 60g / min.

[0035] (5) Performance Results: The prepared high-entropy alloy / ceramic composite coating has a thickness of 1.7 mm. Testing showed a porosity of <0.6%. Due to the skeletal effect of high WC and TaC content and the rare earth refining effect, the microhardness reached 540 HV. Under the same cavitation erosion test parameters, the coating's cavitation erosion resistance after 20 hours was 11.125 times that of the substrate ZG04Cr13Ni5Mo stainless steel (cavitation erosion weight loss of the coating was 0.00136 g, while that of the substrate ZG04Cr13Ni5Mo stainless steel was 0.01513 g). In the wear test, the volume loss rate of the coating after 2 hours was reduced to 43.3% compared to the substrate (coating: 1.09 × 10⁻⁶). -5 mm 3 ·N -1 ·m -1 Matrix: 2.52×10 -5 mm 3 ·N -1 ·m -1 Composite coating structure such as Figure 1 As shown in (c), the cavitation morphology is as follows Figure 4 As shown.

[0036] Depend on Figure 1 It can be seen that the microstructure of the composite coatings prepared in Examples 1 to 3 of the present invention is significantly refined as the WC content increases, which is beneficial to improving the matching of strength and toughness, and improving cavitation erosion and wear resistance.

[0037] Figure 2 , Figure 3 and Figure 4 The figures represent the surface damage morphology of the composite coating after cavitation erosion. It can be seen that with the increase of WC content, the cavitation erosion damage of the composite coating decreases and the proportion of brittle cleavage morphology decreases. This indicates that the increase of WC content promotes the dissolution of more WC phases, promotes the formation of FCC phase, improves the toughness of the composite coating, and reduces the occurrence of brittle cleavage fracture.

[0038] Microhardness testing method: The hardness distribution of four alloy coatings was measured using a Vickers hardness tester (model HXD-1000TMC). The test conditions were a 500 g load and a 10-second dwell time. Nine indentations were made on each sample in a 3×3 matrix distribution with an indentation spacing greater than 100 μm. The average value was taken as the hardness value of the sample.

[0039] Cavitation erosion test method: The cavitation erosion resistance of the laser cladding coating was tested using an ultrasonic cavitation erosion tester at 25±2°C. The test sample size was Φ 22 mm, fixed 6 mm below the horn head, the ultrasonic frequency was 20 kHz, the wavelength was 50 μm, and the test medium was deionized water.

[0040] Wear test method: The wear resistance of the coating was evaluated using a tribological testing machine under dry sliding conditions at room temperature. Si3N4 ceramic balls were selected as the grinding pair, and a normal load of 10 N was applied. The test adopted a reciprocating friction mode with a stroke length of 10 mm, a frequency of 5 Hz, and a total duration of 2 hours.

Claims

1. A cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating, characterized in that: The composite coating material comprises the following components in the indicated mass percentages: WC powder 15%~65%, TaC powder 0.5~3%, rare earth oxide powder 0.2~1%, and FeCrNiAlTi alloy powder 31%~84.3%.

2. The cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating according to claim 1, characterized in that: The composition of the FeCrNiAlTi alloy powder, by atomic percentage, is Cr: 20~35%, Ni: 15~35%, Al: 3~8%, Ti: 3~8%, Fe: balance.

3. The cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating according to claim 1, characterized in that: The rare earth oxide powder has a particle size of 100 nm, while the other powders have a particle size of 3~45 μm.

4. The cavitation-resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating according to claim 1, characterized in that: The rare earth oxides include one or both of CeO2 and La2O3.

5. A method for preparing a cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating as described in any one of claims 1-4, characterized in that: The preparation method includes the following steps: Step 1: Prepare Fe, Cr, Ni, Al, and Ti powders according to the following atomic ratio: Cr: 20~35%, Ni: 15~35%, Al: 3~8%, Ti: 3~8%, Fe: balance. Obtain FeCrNiAlTi alloy powder by ball milling or other powder mixing equipment. Step 2: Mix WC powder, TaC powder, rare earth oxide powder and FeCrNiAlTi alloy powder prepared in Step 1 according to the formula content to form FeCrNiAlTi high entropy alloy / ceramic composite powder by mechanical mixing. Step 3: Spread the powder prepared above evenly and dry the material at a temperature of 100~120℃ for 2~4 hours; Step 4: Clean the substrate surface with alcohol and dry it at 50~60 ℃ to remove oil stains and dirt from the surface; Step 5: Set up a laser cladding process to clad the dried FeCrNiAlTi high-entropy alloy / ceramic composite powder onto the substrate surface to obtain a high-entropy alloy / ceramic composite coating.

6. The method for preparing the cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating according to claim 5, characterized in that: The thickness of the high-entropy alloy / ceramic composite coating is 1~2mm.

7. The method for preparing the cavitation erosion resistant and wear-resistant FeCrNiAlTi high-entropy alloy / ceramic composite coating according to claim 5, characterized in that: The laser cladding process parameters are as follows: spot diameter is 3.5~6.5 mm, laser power is 2.6~4.5kW, overlap rate is 40~60%, cladding head scanning speed is 6~30mm / s, and powder feeding rate is 15~100g / min.

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