Nickel-based amorphous / yttrium-stabilized zirconia gradient coating as well as preparation method and application thereof

Abstract

The invention discloses a nickel-based amorphous / yttrium-stabilized zirconia gradient coating as well as a preparation method and application thereof. The coating comprises a first functional layer, a second functional layer and a third functional layer from inside to outside of a matrix, the coating is formed by compounding 80 to 95 weight percent of nickel-based amorphous powder and 5 to 20 weight percent of YSZ (Yttria Stabilized Zirconia) powder; wherein the YSZ mass percent is distributed in a gradient increasing mode from the first functional layer to the third functional layer. The preparation method comprises the following steps: (1) nickel-based amorphous powder and YSZ powder are mixed in proportion, ball-milled and dried, and mixed powder is obtained; (2) the surface of a base body is polished, cleaned, dried and preheated; and (3) sequentially preparing a first functional layer, a second functional layer and a third functional layer on the pretreated substrate by adopting a laser directional energy deposition technology. The coating has excellent corrosion resistance, abrasion resistance and high-temperature stability, and is particularly suitable for protection of key components under severe working conditions such as ocean engineering, aerospace engine parts and oil drilling tools.

Description

Technical Field

[0001] This invention relates to the fields of laser additive manufacturing and material surface engineering, specifically to a nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating and its preparation method. Background Technology

[0002] Nickel-based amorphous alloys, due to their long-range disordered atomic structure and the absence of crystal defects such as grain boundaries and dislocations, exhibit high strength, high hardness, and excellent corrosion and wear resistance, making them ideal coating substrate materials widely used for surface protection under harsh working conditions. However, single amorphous coatings still lack sufficient hardness and toughness when dealing with extremely high mechanical wear damage, and are prone to cracking and peeling under high temperature or high stress environments.

[0003] Yttrium-stabilized zirconia (YSZ), as a high-performance ceramic material, possesses extremely high hardness, excellent wear resistance, and low thermal conductivity, and is often used to prepare thermal barrier coatings. However, YSZ itself is highly brittle, and its physical properties (such as the coefficient of thermal expansion) differ significantly from those of the metal substrate. Direct lamination can easily lead to poor interfacial bonding and high residual stress, which in turn can cause the coating to crack or peel off.

[0004] In existing technologies, such as the nickel-based tungsten carbide gradient coating disclosed in CN 120556020 A, thermal stress is alleviated through layered design, but problems such as tungsten carbide burn-off and high porosity still exist. While the medium-entropy coating in CN 120796909 A exhibits strong adhesion, its preparation process is complex and costly. Laser-directed energy deposition (LDED), as an advanced additive manufacturing method, utilizes a high-energy laser beam to form a micro-molten pool on the substrate surface, which is then combined with synchronously transported alloy powder metallurgy. This allows for the preparation of high-performance coatings with strong metallurgical bonding to the substrate, dense structure, and extremely low porosity, making it suitable for preparing metal-ceramic composite coatings with complex geometries.

[0005] In summary, there is an urgent need for an innovative composition and structure design that can fully utilize the corrosion resistance of nickel-based amorphous materials and effectively leverage the wear resistance and toughening advantages of YSZ, thereby preparing a metal-ceramic composite coating with excellent comprehensive performance. Summary of the Invention

[0006] Purpose of the invention: In order to overcome the shortcomings of the prior art, the present invention provides a nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating with reasonable composition design, optimized structure, metallurgical interface bonding, and excellent corrosion resistance and wear resistance, as well as its preparation method and application.

[0007] To achieve the above objectives, the technical solution of the present invention is as follows:

[0008] This invention provides a nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating, the coating comprising a first functional layer, a second functional layer, and a third functional layer from the inside to the outside of the substrate; the coating is composed of 80-95 wt.% nickel-based amorphous powder and 5-20 wt.% yttrium-stabilized zirconium oxide; wherein the mass percentage of yttrium-stabilized zirconium oxide increases in a gradient from the first functional layer to the third functional layer.

[0009] The design principle of this invention is as follows: the nickel-based amorphous / yttrium-stabilized zirconia gradient coating is designed as a three-layer structure, with the yttrium-stabilized zirconia content increasing progressively from the first functional layer closest to the substrate to the third functional layer on the surface. This continuous transition in composition smooths out the significant difference in thermal expansion coefficients between the coating and the substrate, thereby significantly reducing residual stress caused by rapid heating and cooling in laser-directed energy deposition (LDED) technology, effectively suppressing crack initiation and propagation, and achieving a smooth transition of coating performance from the substrate to the surface. The inner layer of the coating primarily utilizes the toughness and corrosion resistance of the nickel-based amorphous material, while the outer layer, through the increasing yttrium-stabilized zirconia content, enhances the coating's hardness and wear resistance.

[0010] Preferably, the nickel-based amorphous powder comprises 51.5-54 wt.% Ni, 10-15 wt.% Nb, 10-15 wt.% Zr, 3-5 wt.% Ti, 5-10 wt.% Ta, 3-5 wt.% Co, 3-5 wt.% B, 1-2 wt.% Si, and 1-2 wt.% Er, with the balance being unavoidable impurities.

[0011] In the design of nickel-based amorphous alloy composition, the elements are combined within specific content ranges to produce the following synergistic effects: Ni serves as the matrix element, providing the basis for amorphous formation. Nb and Zr are core amorphous forming elements; their large atomic size difference and negative mixing enthalpy with Ni significantly improve glass-forming ability (GFA) and thermal stability; Nb also contributes excellent corrosion resistance. Ti synergistically optimizes glass-forming ability (GFA) and significantly increases the reduced glass transition temperature. Ta is a key corrosion-resistant element, especially capable of forming a stable passivation film in acidic environments, improving thermal stability and strength. Co is a core wear-resistant reinforcing element, significantly improving the width of the supercooled liquid phase region (ΔTx), hardness, and strength. B and Si are metalloid elements; their small atomic size increases atomic packing density, reduces the critical cooling rate of amorphous alloys, and facilitates the formation of the amorphous phase. Furthermore, they can form a hard phase, improving coating hardness and wear resistance. Er, a rare earth element, reduces oxygen impurities, improves the uniformity of amorphous formation and thermal stability, and simultaneously enhances corrosion resistance.

[0012] Preferably, the yttrium-stabilized zirconium oxide content in the first functional layer is 5-10 wt.%; the yttrium-stabilized zirconium oxide content in the second functional layer is 10-15 wt.%; the yttrium-stabilized zirconium oxide content in the third functional layer is 15-20 wt.%; and the thickness of the first, second, and third functional layers is 200-300 μm.

[0013] This invention designs the yttrium-stabilized zirconium oxide (YSZ) content within the aforementioned range. When the YSZ content is below 5%, the ceramic reinforcement effect is limited, making it difficult to significantly improve hardness and wear resistance. A YSZ content exceeding 20 wt.% easily leads to increased coating porosity, with little improvement in hardness and wear resistance. The gradient design of 5–20 wt.% allows for a synergistic improvement in coating hardness and wear resistance through the gradual introduction of the ceramic phase, while ensuring coating density and good bonding, and simultaneously maintaining the inherent excellent corrosion resistance of the nickel-based amorphous system.

[0014] Preferably, in step (1), the nickel-based amorphous powder has a particle size of 50-150 μm; and the yttrium-stabilized zirconium oxide powder has a particle size of 45-75 μm.

[0015] This invention also provides a method for preparing a nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating, comprising the following steps:

[0016] (1) Nickel-based amorphous powder and yttrium-stabilized zirconium oxide powder were mixed in a certain proportion, ball-milled and dried to obtain a mixed powder;

[0017] (2) Polish the substrate surface until smooth, clean and dry it, and then preheat it;

[0018] (3) Using laser-directed energy deposition technology, a first functional layer, a second functional layer and a third functional layer are sequentially prepared on the pretreated substrate; wherein the yttrium-stabilized zirconium oxide content in the first functional layer, the second functional layer and the third functional layer is distributed in a gradient increasing manner;

[0019] Preferably, in step (1), the specific process of ball milling and drying after mixing the nickel-based amorphous powder and yttrium-stabilized zirconium oxide powder in a certain proportion is as follows: the nickel-based amorphous powder and YSZ powder are mixed in a ball mill for 10-15 hours, the ball-to-material ratio is 2:1-3:1, the ratio of large, medium and small steel balls is 1:3:6, and then dried in a vacuum drying oven at 100-120℃ for 1-2 hours.

[0020] Preferably, in step (2), the substrate is preheated to 350-500°C.

[0021] Preferably, in step (3), the specific process parameters of the laser directional energy deposition are: laser power 800~1400 W, scanning speed 8~12 mm / s, powder feeding rate 0.4~0.6 r / min, protective gas Ar flow rate 5 L / min, and overlap rate 30%~50%.

[0022] This invention also provides the application of a nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating in the preparation of corrosion-resistant and wear-resistant components.

[0023] Preferably, the component is a marine engineering equipment part, an aerospace engine component, or an oil drill pipe joint.

[0024] Beneficial effects: Compared with the prior art, the present invention has the following significant effects:

[0025] 1. The nickel-based amorphous / yttrium-stabilized zirconia gradient coating of this invention combines the strong corrosion resistance of nickel-based amorphous materials with the high hardness and wear resistance of yttrium-stabilized zirconia ceramics through synergistic design of composition and structure. The yttrium-stabilized zirconia content in the coating exhibits a gradient increase, effectively mitigating the significant difference in thermal expansion coefficients between the coating and the substrate, inhibiting crack initiation and propagation. This achieves a gradient improvement in coating hardness and wear resistance while maintaining a high internal amorphous content. Furthermore, the introduction of elements such as Ta, Nb, and Er further enhances the coating's corrosion resistance in harsh environments.

[0026] 2. The preparation method of this invention uses laser-directed energy deposition (LDED) technology, combined with optimized composition gradient design, laser process parameters and powder pretreatment process to obtain a dense coating with porosity ≤1.5%, microhardness ≥650 HV and corrosion rate ≤0.05 mm / a.

[0027] 3. The nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating of the present invention is suitable for the protection of critical components under harsh working conditions such as marine engineering, aerospace engine parts, and oil drilling tools, and has broad industrial application prospects. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating structure prepared in Example 1 of the present invention. Detailed Implementation

[0029] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] Example 1

[0031] Nickel-based amorphous powder is prepared with the following composition: 51.5 wt.% Ni, 10 wt.% Nb, 10 wt.% Zr, 3 wt.% Ti, 5 wt.% Ta, 3 wt.% Co, 3 wt.% B, 1 wt.% Si, and 1 wt.% Er. Vacuum induction melting gas atomization can be used for this process.

[0032] Three different amounts of nickel-based amorphous powder with a particle size of 50 μm and YSZ powder with a particle size of 45 μm were taken, specifically: 95 wt.% nickel-based amorphous powder + 5 wt.% 5YSZ, 90 wt.% nickel-based amorphous powder + 10 wt.% 5YSZ, and 85 wt.% nickel-based amorphous powder + 15 wt.% 5YSZ. The three different amounts of mixed powder were placed in a planetary ball mill and mixed for 10 hours, with a ball-to-powder ratio of 2:1 and a ratio of large, medium, and small steel balls of 1:3:6. The mixtures were then dried in a vacuum drying oven at 100℃ for 1 hour.

[0033] The oxide layer on the surface of the 20G steel substrate is removed by grinding, cleaned with anhydrous ethanol and dried, and then preheated to 350°C.

[0034] A three-bucket synchronous coaxial powder feeding system was employed for laser-directed energy deposition (EDD), using argon as the protective gas. The coatings were deposited sequentially according to the following parameters: laser power 800 W, scanning speed 8 mm / s, powder feeding rate 0.4 r / min, protective gas flow rate 5 L / min, and overlap ratio 30%. Three mixed powders were placed in three separate buckets for layered deposition, resulting in the following functional layers: first functional layer: 5 wt.% yttrium-stabilized zirconia, 200 μm thickness; second functional layer: 10 wt.% yttrium-stabilized zirconia, 200 μm thickness; third functional layer: 15 wt.% yttrium-stabilized zirconia, 200 μm thickness. This yielded a nickel-based amorphous / yttrium-stabilized zirconia gradient coating.

[0035] The schematic diagram of the nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating structure in this embodiment is shown below. Figure 1 As shown.

[0036] Example 2

[0037] Nickel-based amorphous powder is prepared with the following composition: 52.9 wt.% Ni, 12 wt.% Nb, 12 wt.% Zr, 4 wt.% Ti, 8 wt.% Ta, 4 wt.% Co, 4 wt.% B, 1.6 wt.% Si, and 1.5 wt.% Er. Vacuum induction melting gas atomization can be used for this purpose.

[0038] Three different amounts of mixed powders containing 100 μm nickel-based amorphous oxide and 60 μm yttrium-stabilized zirconium oxide were taken: 92 wt.% nickel-based amorphous oxide + 8 wt.% 5YSZ, 86 wt.% nickel-based amorphous oxide + 14 wt.% 5YSZ, and 80 wt.% nickel-based amorphous oxide + 20 wt.% 5YSZ. The three different amounts of mixed powders were placed in a planetary ball mill and mixed for 12 hours, with a ball-to-powder ratio of 2:1 and a ratio of large, medium, and small steel balls of 1:3:6. The mixtures were then dried in a vacuum drying oven at 110℃ for 1.5 hours.

[0039] The oxide layer on the surface of the 20G steel substrate is removed by grinding, cleaned with anhydrous ethanol and dried, and then preheated to 400℃.

[0040] A three-bucket synchronous coaxial powder feeding system was employed for laser-directed energy deposition (EDD), using argon as the protective gas. The coatings were deposited sequentially according to the following parameters: laser power 1100 W, scanning speed 10 mm / s, powder feeding rate 0.5 r / min, protective gas flow rate 5 L / min, and overlap ratio 40%. Three mixed powders were placed in three separate buckets for layered deposition, resulting in the following functional layers: first functional layer: 8 wt.% yttrium-stabilized zirconium oxide, single-layer thickness 250 μm; second functional layer: 14 wt.% yttrium-stabilized zirconium oxide, single-layer thickness 250 μm; third functional layer: 20 wt.% yttrium-stabilized zirconium oxide, single-layer thickness 250 μm. This yielded a nickel-based amorphous / yttrium-stabilized zirconium oxide gradient coating.

[0041] Example 3

[0042] Nickel-based amorphous powder is prepared with the following composition: 54 wt.% Ni, 15 wt.% Nb, 15 wt.% Zr, 5 wt.% Ti, 10 wt.% Ta, 5 wt.% Co, 5 wt.% B, 2 wt.% Si, and 2 wt.% Er. Vacuum induction melting gas atomization can be used for this process.

[0043] Three different amounts of mixed powders containing 150 μm nickel-based amorphous oxide and 75 μm yttrium-stabilized zirconium oxide were taken: 90 wt.% nickel-based amorphous oxide + 10 wt.% 5YSZ, 85 wt.% nickel-based amorphous oxide + 15 wt.% 5YSZ, and 80 wt.% nickel-based amorphous oxide + 20 wt.% 5YSZ. The three different amounts of mixed powders were placed in a planetary ball mill and mixed for 15 hours, with a ball-to-powder ratio of 3:1 and a ratio of large, medium, and small steel balls of 1:3:6. The mixtures were then dried in a vacuum drying oven at 120℃ for 2 hours.

[0044] The oxide layer on the surface of the 20G steel substrate is removed by grinding, cleaned with anhydrous ethanol and dried, and then preheated to 500℃.

[0045] A three-bucket synchronous coaxial powder feeding system was employed for laser-directed energy deposition (EDD), using argon as the protective gas. The coatings were deposited sequentially according to the following parameters: laser power 1400 W, scanning speed 12 mm / s, powder feeding rate 0.6 r / min, protective gas flow rate 5 L / min, and overlap ratio 50%. Three mixed powders were placed in three separate buckets for layered deposition, resulting in the following functional layers: first functional layer: 10 wt.% yttrium-stabilized zirconia, 300 μm thickness; second functional layer: 15 wt.% yttrium-stabilized zirconia, 300 μm thickness; third functional layer: 20 wt.% yttrium-stabilized zirconia, 300 μm thickness. This yielded a nickel-based amorphous / yttrium-stabilized zirconia gradient coating.

[0046] Comparative Example 1

[0047] A three-layer pure nickel-based amorphous coating without yttrium-stabilized zirconium oxide (YSZ) was prepared as a control coating. The preparation method was the same as in Example 1, except that YSZ was not added.

[0048] Nickel-based amorphous powder was prepared with the following composition: 51.5 wt.% Ni, 10 wt.% Nb, 10 wt.% Zr, 3 wt.% Ti, 5 wt.% Ta, 3 wt.% Co, 3 wt.% B, 1 wt.% Si, and 1 wt.% Er. Vacuum induction melting and gas atomization were employed. Three layers were sequentially deposited on the substrate, each with a thickness of 200 μm.

[0049] Comparative Example 2

[0050] A nickel-based amorphous / yttrium-stabilized zirconia gradient coating with a YSZ content of <5% was prepared as a comparative coating. The preparation method was the same as in Example 1. The difference was that the YSZ content of the first functional layer was 3 wt.%.

[0051] Three different mixtures of nickel-based amorphous powder with a particle size of 50 μm and YSZ powder with a particle size of 45 μm were taken, specifically: 97 wt.% nickel-based amorphous powder + 3 wt.% 5YSZ, 90 wt.% nickel-based amorphous powder + 10 wt.% 5YSZ, and 85 wt.% nickel-based amorphous powder + 15 wt.% 5YSZ. Three layers were sequentially deposited on the substrate, each with a thickness of 200 μm.

[0052] Comparative Example 3

[0053] A nickel-based amorphous / yttrium-stabilized zirconia gradient coating with a YSZ content >20% was prepared as a comparative coating. The preparation method was the same as in Example 1. The difference was that the YSZ content of the third functional layer was 24 wt.%.

[0054] Three different mixtures of nickel-based amorphous powder with a particle size of 50 μm and YSZ powder with a particle size of 45 μm were taken, specifically: 95 wt.% nickel-based amorphous powder + 5 wt.% 5YSZ, 90 wt.% nickel-based amorphous powder + 10 wt.% 5YSZ, and 76 wt.% nickel-based amorphous powder + 24 wt.% 5YSZ. Three layers were sequentially deposited on the substrate, each with a thickness of 200 μm.

[0055] The coatings prepared in Examples 1-3 and Comparative Examples 1-3 were subjected to performance tests. The electrochemical corrosion experiments were conducted using a CS2350 electrochemical workstation with a traditional three-electrode system. A platinum sheet was used as the auxiliary electrode, saturated calomel as the reference electrode, and the test sample as the working electrode. The corrosion electrolyte was an aqueous solution containing 3.5 wt.% NaCl, and the sample surface area was 1 cm². 2 Open circuit potential (OCP) set time 60 min, electrochemical impedance spectroscopy frequency 10 -2 ~10 5 The test was conducted at Hz, amplitude 10 mV, dynamic potential polarization, scan rate 1 mV / s, and scan range -1.5 ~ 1.5 V. The wear test conditions were a load of 50 kg and a wear time of 0.5 h. The results are shown in the table below:

[0056] Table 1 shows the performance tests of the coatings prepared in Examples 1-3 and Comparative Examples 1-3.

[0057] Sample Porosity (%) Microhardness (HV) Corrosion rate (mm / a) Wear volume (mm³ / min) Example 1 0.95 789 0.05 5.98 Example 2 1.21 734 0.05 6.43 Example 3 1.32 753 0.05 6.79 Comparative Example 1 0.84 583 0.05 12.67 Comparative Example 2 1.12 685 0.06 8.51 Comparative Example 3 1.36 652 0.07 9.34

[0058] As shown in Table 1, the nickel-based amorphous / yttrium-stabilized zirconia gradient coatings prepared in Examples 1-3 of this invention, while maintaining similar low porosity, high bonding strength, and excellent corrosion resistance as Comparative Example 1, exhibit significantly improved microhardness and approximately twice the wear resistance. Although the nickel-based amorphous coating prepared in Comparative Example 1 has good corrosion resistance, its hardness and wear resistance are insufficient, making it difficult to meet the requirements of high-stress wear conditions. The nickel-based amorphous / yttrium-stabilized zirconia gradient coatings prepared in Comparative Examples 2-3 show decreased corrosion resistance and wear resistance, making them unsuitable for harsh working conditions.

[0059] This comparison powerfully demonstrates that the introduction of yttrium-stabilized zirconia (YSZ) and its gradient design are key to synergistically improving coating hardness and wear resistance without compromising its bonding strength and corrosion resistance.

[0060] This invention successfully prepared a gradient coating with high bonding strength, excellent corrosion resistance, and significantly enhanced wear resistance through innovative nickel-based amorphous composition design, the introduction and gradient structure optimization of yttrium-stabilized zirconia (YSZ), and controlled laser-directed energy deposition process. Compared with pure nickel-based amorphous coatings prepared by the same process, its overall performance, especially wear resistance, has achieved a leap forward, solving the problem of insufficient hardness and wear resistance of single amorphous coatings. It has broad application prospects in the field of surface protection for components requiring high corrosion resistance and wear resistance.

Claims

1. A nickel-based amorphous / yttrium-stabilized zirconia gradient coating, characterized by, The coating comprises a first functional layer, a second functional layer and a third functional layer from the inside to the outside of the substrate; the coating is composed of 80-95 wt.% of nickel-based amorphous powder and 5-20 wt.% of yttrium stabilized zirconia powder; wherein the yttrium stabilized zirconia content is gradiently and increasingly distributed from the first functional layer to the third functional layer.

2. The nickel-based amorphous / yttrium-stabilized zirconia gradient coating of claim 1, wherein, The nickel-based amorphous powder composition comprises 51.5-54 wt.% Ni, 10-15 wt.% Nb, 10-15 wt.% Zr, 3-5 wt.% Ti, 5-10 wt.% Ta, 3-5 wt.% Co, 3-5 wt.% B, 1-2 wt.% Si, 1-2 wt.% Er, and the balance is inevitable impurities.

3. The nickel-based amorphous / yttrium-stabilized zirconia gradient coating of claim 1, wherein, The yttrium stabilized zirconia content in the first functional layer is 5-10 wt.%; the yttrium stabilized zirconia content in the second functional layer is 10-15 wt.%; the yttrium stabilized zirconia content in the third functional layer is 15-20 wt.%; the thickness of the first functional layer, the second functional layer and the third functional layer is 200-300 μm.

4. The nickel-based amorphous / yttrium-stabilized zirconia gradient coating of claim 1, wherein, The particle size of the nickel-based amorphous powder is 50-150 μm; the particle size of the yttrium stabilized zirconia powder is 45-75 μm.

5. The method of producing a nickel-based amorphous / yttrium stabilized zirconia gradient coating according to any one of claims 1 to 4, wherein The method comprises the following steps: (1) mixing the nickel-based amorphous powder and the yttrium stabilized zirconia powder in proportion, ball milling and drying to obtain a mixed powder; (2) polishing, cleaning and drying the surface of the substrate and preheating; (3) using laser directed energy deposition technology to sequentially prepare the first functional layer, the second functional layer and the third functional layer on the pretreated substrate to obtain the nickel-based amorphous / yttrium stabilized zirconia gradient coating; wherein the yttrium stabilized zirconia content in the first functional layer, the second functional layer and the third functional layer is gradiently and increasingly distributed.

6. The method of claim 5, wherein the method further comprises: In step (1), the specific process of ball milling and drying the mixed nickel-based amorphous powder and yttrium stabilized zirconia powder is as follows: the nickel-based amorphous powder and yttrium stabilized zirconia powder are mixed by a ball mill for 10-15 hours, the ball-to-material ratio is 2:1-3:1, the number ratio of large, medium and small steel balls is 1:3:6, and the mixture is dried in a vacuum drying oven at 100-120℃ for 1-2 hours.

7. The method of claim 5, wherein the method further comprises: In step (2), the substrate is preheated to 350-500℃.

8. The method of claim 5, wherein the method further comprises: In step (3), the specific process parameters of the laser directed energy deposition are as follows: laser power 800~1400 W, scanning speed 8~12 mm / s, powder feeding rate 0.4~0.6 r / min, protective gas Ar flow rate 5 L / min, and overlap rate 30%~50%.

9. Use of the nickel-based amorphous / yttrium stabilized zirconia gradient coating according to any one of claims 1-8 in the preparation of a corrosion-resistant and wear-resistant component.

10. Use of the nickel-based amorphous / yttrium stabilized zirconium oxide gradient coating according to claim 9 for the production of a corrosion-resistant, wear-resistant component, characterized in that The component is a marine engineering equipment part, an aerospace engine part or an oil drill pipe joint.

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