Alloy powder suitable for oil screw surface treatment and application method thereof

Abstract

This application relates to the field of metal powder processing technology, specifically disclosing an alloy powder suitable for surface treatment of oil screws and its application method. An alloy powder suitable for surface treatment of oil screws includes a first powder raw material, a second powder raw material, and a functional auxiliary mixture raw material. The first powder raw material contains the following components by weight: 65-75 parts tungsten; 20-25 parts cobalt; 4-8 parts carbon; and 3-5 parts alumina. The second powder raw material contains the following components by weight: 9-12 parts chromium; 5-8 parts boron; 4-6 parts silicon; and 50-80 parts nickel. The functional auxiliary mixture raw material contains the following components by weight: 8-10 parts molybdenum; 80-90 parts titanium; and 3-5 parts niobium. The weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is (0.8-1.2):1:(0.2-0.4). This application can improve the interfacial bonding performance between different powder raw materials, obtaining an alloy powder suitable for oil screws that is high-temperature resistant, corrosion-resistant, and wear-resistant.

Description

Technical Field

[0001] This application relates to the field of metal powder processing technology, and more specifically, to an alloy powder suitable for surface treatment of oil screws and its application method. Background Technology

[0002] Oilfield screw pumps are widely used equipment in oil extraction, particularly suitable for conveying high-viscosity, sand-containing, and gas-containing crude oil. Their working principle involves a power source transmitting power to the drive head, then a reduction gear transmitting power to the polished rod, and finally to the screw pump at the bottom of the well. The rotor and stator of the screw pump form a sealed cavity; as the rotor rotates, this sealed cavity continuously moves, thereby achieving the intake and discharge of crude oil.

[0003] The screw rotors used in oilfield screw pumps face harsh operating conditions characterized by high temperatures, strong corrosion, and high wear. Ordinary alloy steel is simply insufficient to meet these requirements. Currently, most rotors produced domestically and internationally are plated with hard chrome. However, these rotors exhibit poor corrosion resistance in saline cement slurries, potentially rendering the entire motor assembly unusable and directly impacting the screw's lifespan. Stainless steel rotors, on the other hand, are significantly more expensive, typically 4-5 times the cost of hard chrome plating, thus limiting their application. Therefore, spraying a heat-resistant, corrosion-resistant, and wear-resistant alloy onto the screw rotor surface is a highly suitable surface treatment method.

[0004] For example, patent application CN115383110A discloses a spherical tungsten carbide and nickel-based alloy mixed powder for screw reinforcement and a laser cladding method. The mixed powder is composed of spherical tungsten carbide powder and nickel-based alloy powder. Based on the total mass of the mixed powder, the mass percentage of spherical tungsten carbide powder is 60-85%, and the remainder is nickel-based alloy powder. This invention clads the mixed spherical tungsten carbide powder and nickel-based alloy powder onto the working surface of the part. By controlling the specific gravity of the spherical tungsten carbide powder and nickel-based alloy powder, the performance of spherical tungsten carbide is maximized. The two powders are mixed to form a high-hardness, high-toughness, and wear-resistant reinforcing layer on the surface of the workpiece with complex curved surfaces.

[0005] Regarding the aforementioned technologies, the inventors believe that although laser cladding of two or more mixed powders on the screw surface can bring about a superimposed enhancement of the corresponding effects, the interfacial bonding performance between different powders is not good, making it difficult to achieve the expected enhancement effect. The overall effect of the application still needs to be improved.

[0006] Therefore, there is an urgent need to propose a solution to address the aforementioned technical problems. Summary of the Invention

[0007] In order to improve the interfacial bonding performance between different powder raw materials and obtain alloy powders that are resistant to high temperature, corrosion and wear and suitable for oil screws, this application provides an alloy powder suitable for surface treatment of oil screws and its application method.

[0008] In a first aspect, this application provides an alloy powder suitable for surface treatment of oil screws, employing the following technical solution:

[0009] An alloy powder suitable for surface treatment of oil screws, comprising a first powder raw material, a second powder raw material, and a functional auxiliary mixing agent raw material;

[0010] The first powder raw material comprises the following components in parts by weight:

[0011] 65-75 parts tungsten;

[0012] 20-25 parts cobalt;

[0013] Carbon 4-8 parts;

[0014] 3-5 parts aluminum oxide;

[0015] The second powder raw material comprises the following components in parts by weight:

[0016] Chromium 9-12 parts;

[0017] 5-8 parts boron;

[0018] 4-6 parts silicon;

[0019] Nickel 50-80 parts;

[0020] The functional auxiliary mixture raw material comprises the following components in parts by weight:

[0021] 8-10 parts of molybdenum;

[0022] 80-90 parts titanium;

[0023] 3-5 parts of niobium;

[0024] The weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is (0.8-1.2):1:(0.2-0.4).

[0025] By adopting the above technical solution, in the first powder raw material, tungsten can improve hardness, wear resistance, high-temperature resistance, and chemical stability; cobalt can promote the formation of crystal nuclei in the liquid alloy, thereby improving the alloy's processing performance, corrosion resistance, and strength; carbon can promote grain boundary movement in the alloy, improve intergranular strength and plasticity, thereby enhancing the alloy's hardness and wear resistance; alumina can effectively resist mechanical wear and exhibit good corrosion resistance. In the second powder raw material, chromium can improve strength and hardness, enhance wear resistance, improve corrosion resistance and heat resistance; boron can enhance hardness and improve wear resistance; silicon can enhance mechanical properties, improve corrosion resistance, improve heat resistance, and enhance castability and machinability; nickel can improve the alloy's strength, corrosion resistance, high-temperature stability, and oxidation resistance. By mixing the first and second powder raw materials, the screw rotor can exhibit better heat resistance, corrosion resistance, and wear resistance after surface treatment. Meanwhile, the alloy powder also uses functional auxiliary mixing materials. Among them, molybdenum can form solid solutions with other elements and can strengthen and harden the grain boundaries of the alloy, reducing dislocation movement at the grain boundaries; titanium can refine the grains and eliminate and absorb impurity elements in the alloy; niobium enhances the activity of the melt, thereby increasing the degree of interfacial reaction. Through the compounding of the three, the functional auxiliary mixing materials can significantly improve the interfacial bonding performance between different alloy powders when mixed with the first powder material and the second powder material. This allows the combination of the first powder material and the second powder material to achieve a corresponding effect that is far close to the expected effect, ultimately resulting in an alloy powder that is suitable for oil screws, and is resistant to high temperature, corrosion, and wear.

[0026] Preferably, the weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is 1:1:0.3.

[0027] By adopting the above technical solution, the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material in the above weight ratio exhibit excellent synergistic effects when mixed and applied. This allows the functional auxiliary mixture raw material to fully play its role in the common compounding and enhancement of the first powder raw material and the second powder raw material, and brings about a better interface bonding improvement effect. As a result, an alloy powder with excellent high temperature resistance, corrosion resistance and wear resistance is obtained, which is suitable for the surface treatment of oil screws.

[0028] Preferably, the first powder raw material comprises the following components in parts by weight:

[0029] 70 parts of tungsten;

[0030] 22 parts of cobalt;

[0031] 4 parts carbon;

[0032] 4 parts aluminum oxide.

[0033] By adopting the above technical solution, the first powder raw material composed of the above component ratio enables each component to fully play its role in the alloy system of the first powder raw material, and the coordination between them is better, thereby making the application of the first powder raw material more effective in improving the high temperature resistance, corrosion resistance and wear resistance.

[0034] Preferably, the second powder raw material comprises the following components in parts by weight:

[0035] 10 parts chromium;

[0036] Boron 6 parts;

[0037] 5 parts silicon;

[0038] Nickel 65 parts.

[0039] By adopting the above technical solution, the second powder material composed of the above component ratio allows each component to fully play its role in the alloy system of the second powder material, and the coordination between them is better, thereby resulting in better improvement in the high temperature resistance, corrosion resistance and wear resistance brought about by the application of the second powder material.

[0040] Preferably, the functional auxiliary mixture raw material comprises the following components in parts by weight:

[0041] 10 parts of molybdenum;

[0042] 85 parts of titanium;

[0043] Niobium, 5 parts.

[0044] By adopting the above technical solution, when the molybdenum, titanium and niobium components are used in combination, the compounding effect between them is excellent, and it can bring better improvement and enhancement to the interface between the first powder raw material and the second powder raw material. As a result, the alloy powder that is finally suitable for the surface treatment of oil screws can exhibit excellent high temperature resistance, corrosion resistance and wear resistance after application.

[0045] Preferably, the alloy powder suitable for oil screw surface treatment has a particle size of 13-18 μm.

[0046] By adopting the above technical solution, the alloy powder with the above particle size is convenient for treating the surface of the oil screw when applied. Moreover, under this particle size specification, the first powder raw material, the second powder raw material and the functional auxiliary mixing agent raw material can be mixed more fully, and the effect of their cooperation is better when applied, resulting in more outstanding high temperature resistance, corrosion resistance and wear resistance.

[0047] Secondly, this application provides a method for applying alloy powder suitable for surface treatment of oil screws, using the following technical solution:

[0048] A method for applying alloy powder suitable for surface treatment of oil screws includes the following steps:

[0049] (1) Prepare the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material;

[0050] (2) After mixing the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material, thermal spraying is performed on the surface of the screw rotor, and a cladding layer is obtained by laser cladding to complete the surface treatment of the screw rotor.

[0051] By adopting the above technical solution, the first powder raw material, the second powder raw material, and the functional auxiliary agent raw material can be simply mixed and applied, making the overall operation relatively convenient. Then, in the application process, thermal spraying is performed first, followed by laser cladding, which enables the first powder raw material, the second powder raw material, and the functional auxiliary agent raw material to form a more sufficient, complete, and stable interface bond. The resulting cladding layer has better quality and can bring excellent high temperature resistance, corrosion resistance, and wear resistance, thus resulting in a better surface treatment effect on the screw rotor.

[0052] Preferably, the thickness of the cladding layer in step (2) is 20-40 μm.

[0053] By adopting the above technical solution, the cladding layer of the above thickness can meet the surface treatment requirements of the screw rotor and can exhibit excellent and stable high temperature resistance, corrosion resistance and wear resistance during application.

[0054] Preferably, in step (2), the temperature of thermal spraying is 1000-1400℃.

[0055] By adopting the above technical solution, when thermally spraying the mixture of the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material, the selected temperature allows the mixture to adhere to the screw rotor surface more uniformly and stably, and the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material can also form a pre-bonding with each other, which is more conducive to forming a stable and excellent interface bond after subsequent laser cladding.

[0056] Preferably, in step (2), the laser wavelength for laser cladding is 10-12 μm, the laser scanning speed is 0.6 m / min-1.2 m / min, and the laser power density is 10-20 kW / cm². 2 .

[0057] By adopting the above technical solution, the selection of the above process parameters during the laser cladding process can fully combine the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material, which is conducive to obtaining a cladding layer with better application quality, and thus brings a better surface treatment effect to the screw rotor.

[0058] In summary, this application has the following beneficial effects:

[0059] This application uses functional auxiliary additives containing molybdenum, titanium, and niobium, which can bring excellent interfacial bonding improvement to different alloy powders, significantly enhance the bonding between the first powder material and the second powder material, and work in combination with the first powder material and the second powder material to achieve corresponding effects that are close to the expected, thereby finally obtaining alloy powders that are suitable for oil screws, and are resistant to high temperature, corrosion, and wear. Detailed Implementation

[0060] The present application will be further described in detail below with reference to embodiments and comparative examples.

[0061] Example 1

[0062] An alloy powder suitable for surface treatment of oil screws is composed of a first powder raw material, a second powder raw material and a functional auxiliary mixture raw material. The composition and corresponding weight of the first powder raw material are shown in Table 1, the composition and corresponding weight of the second powder raw material are shown in Table 2, and the composition and corresponding weight of the functional auxiliary mixture raw material are shown in Table 3.

[0063] The weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is 1:1:0.3; the particle size of the alloy powder suitable for oil screw surface treatment is 15.5μm.

[0064] Examples 2-4

[0065] An alloy powder suitable for surface treatment of oil screws differs from Example 1 in that the composition and corresponding weight of the first powder raw material are shown in Table 1.

[0066] Table 1. Composition and weight parts (kg / part) of the first powder raw material in Examples 1-4

[0067] raw material Example 1 Example 2 Example 3 Example 4 Tungsten 70 70 65 75 cobalt 22 22.5 20 25 carbon 4 6 4 8 Alumina 4 4 3 5

[0068] Examples 5-7

[0069] An alloy powder suitable for surface treatment of oil screws differs from Example 1 in that the composition and corresponding weight of the second powder raw material are shown in Table 2.

[0070] Table 2. Composition and weight parts (kg / part) of the second powder raw material in Examples 1, 5-7.

[0071] raw material Example 1 Example 5 Example 6 Example 7 chromium 10 10.5 9 12 boron 6 6.5 5 8 silicon 5 5 4 6 nickel 65 65 50 80

[0072] Examples 8-10

[0073] An alloy powder suitable for surface treatment of oil screws differs from Example 1 in that the composition and corresponding weight of the functional auxiliary mixture raw material are shown in Table 3.

[0074] Table 3. Composition and weight parts (kg / part) of the functional auxiliary mixture raw materials in Examples 1, 8-10

[0075]

[0076] Example 11

[0077] An alloy powder suitable for surface treatment of oil screws differs from Example 1 in that the weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is 0.8:1:0.2.

[0078] Example 12

[0079] An alloy powder suitable for surface treatment of oil screws differs from Example 1 in that the weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is 1.2:1:0.4.

[0080] Example 13

[0081] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that the particle size of the alloy powder suitable for surface treatment of oil screws is 13 μm.

[0082] Example 14

[0083] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that the particle size of the alloy powder suitable for surface treatment of oil screws is 18 μm.

[0084] Example 15

[0085] A method for applying alloy powder suitable for surface treatment of oil screws includes the following steps:

[0086] (1) Prepare the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material;

[0087] (2) After mixing the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material, thermal spraying is performed on the surface of the screw rotor, and a cladding layer is obtained by laser cladding to complete the surface treatment of the screw rotor.

[0088] Note: In the above operations, the cladding layer thickness was 40 μm; the thermal spraying temperature was 1200℃; the laser wavelength for laser cladding was 10 μm, the laser scanning speed was 0.9 m / min, and the laser power density was 15 kW / cm². 2 .

[0089] Example 16

[0090] A method for applying alloy powder suitable for the surface treatment of oil screws, which differs from Example 15 in that the cladding layer thickness in step (2) is 20 μm.

[0091] Example 17

[0092] A method for applying alloy powder suitable for the surface treatment of oil screws, which differs from Example 15 in that the cladding layer thickness in step (2) is 30 μm.

[0093] Example 18

[0094] A method for applying alloy powder suitable for the surface treatment of oil screws, which differs from Example 15 in that, in step (2), the temperature of thermal spraying is 1000°C.

[0095] Example 19

[0096] A method for applying alloy powder suitable for the surface treatment of oil screws, which differs from Example 15 in that, in step (2), the temperature of thermal spraying is 1400°C.

[0097] Example 20

[0098] A method for applying alloy powder suitable for surface treatment of oil screws differs from Example 15 in that, in step (2), the laser wavelength for laser cladding is 10 μm, the laser scanning speed is 0.6 m / min, and the laser power density is 10 kW / cm². 2 .

[0099] Example 21

[0100] A method for applying alloy powder suitable for surface treatment of oil screws differs from Example 15 in that, in step (2), the laser wavelength for laser cladding is 12 μm, the laser scanning speed is 1.2 m / min, and the laser power density is 20 kW / cm². 2 .

[0101] Comparative Example 1

[0102] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that no functional auxiliary mixing agent raw material is used.

[0103] Comparative Example 2

[0104] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that molybdenum is not used in the components of the functional auxiliary mixture raw material.

[0105] Comparative Example 3

[0106] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that titanium is not used in the composition of the functional auxiliary mixture raw material.

[0107] Comparative Example 4

[0108] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that niobium is not used in the composition of the functional auxiliary mixture raw material.

[0109] Comparative Example 5

[0110] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that the components of the functional auxiliary mixture raw material do not use molybdenum and titanium.

[0111] Comparative Example 6

[0112] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that the components of the functional auxiliary mixture raw material do not use molybdenum and niobium.

[0113] Comparative Example 7

[0114] An alloy powder suitable for surface treatment of oil screws, which differs from Example 1 in that titanium and niobium are not used in the composition of the functional auxiliary mixture raw material.

[0115] Performance testing

[0116] Test Samples: Commercially available Netzsch screw stator and rotor NM031BY01P05B were selected. The rotor material was cast iron. The rotor was then surface-treated using alloy powders suitable for oilfield screw surface treatment as described in Examples 1-14 and Comparative Examples 1-7. The surface treatment method was obtained in Example 15, resulting in test samples 1-14 and control samples 1-7. Simultaneously, the rotors were surface-treated using the alloy powders suitable for oilfield screw surface treatment described in Example 1, employing the methods described in Examples 16-21, resulting in test samples 15-20.

[0117] Test methods: (1) High temperature resistance test: The screw pump rotor is placed in a high temperature environment for testing. A Bona 1400℃ muffle furnace is used. The test temperature should reach or exceed the designed high temperature resistance limit. The limit temperature of the screw pump rotor is determined by observing the deformation, cracks or other damage of the rotor.

[0118] (2) Corrosion resistance test: Place the screw pump rotor sample in a salt spray test chamber to simulate the salt spray conditions in the industrial atmospheric environment. The test conditions are 35℃±2℃ and salinity is 5%±1% until corrosion is observed on the rotor. Record the test duration.

[0119] (3) Wear resistance test: The screw pump rotor is tested according to the contents of standard GB / T 12444-2006 "Metallic Materials Wear Test Method Test Ring-Block Sliding Wear Test" and the wear amount is recorded;

[0120] The untreated screw rotor was subjected to the above-mentioned high temperature resistance test, corrosion resistance test, and wear resistance test, and the initial values ​​obtained were denoted as A, B, and C, respectively. Then, the surface-treated screw rotor was subjected to the above tests in the same way, and the values ​​obtained were denoted as a, b, and c, respectively. Finally, the improvement rate of high temperature resistance, the improvement rate of corrosion resistance, and the reduction rate of wear resistance were calculated, where the improvement rate of high temperature resistance = (aA) / A, the improvement rate of corrosion resistance = (b - B) / B, and the reduction rate of wear resistance = (C - c) / C.

[0121] After completing the above tests on test samples 1-20 and control samples 1-7 in sequence, the corresponding results are recorded in Table 4.

[0122] Table 4. Test results of test samples 1-20 and control samples 1-7

[0123] sample High temperature resistance improvement rate (%) Corrosion resistance improvement rate (%) Wear resistance reduction rate (%) Test sample 1 37.7 16.3 23.9 Test sample 2 36.2 14.8 22.4 Test sample 3 36.8 15.4 23.0 Test sample 4 36.5 15.1 22.7 Test sample 5 37.1 15.7 23.3 Test sample 6 36.4 15.0 22.6 Test sample 7 37.5 16.1 23.7 Test sample 8 37.2 15.8 23.4 Test sample 9 36.6 15.2 22.8 Test sample 10 38.1 16.7 24.3 Test sample 11 36.9 15.5 23.1 Test sample 12 36.7 15.3 22.9 Test sample 13 37.0 15.6 23.2 Test sample 14 36.3 14.9 22.8 Test sample 15 36.0 14.6 22.2 Test sample 16 37.3 15.9 23.5 Test sample 17 37.5 16.1 23.7 Test sample 18 37.4 16.0 23.6 Test sample 19 36.5 15.1 22.7 Test sample 20 36.9 15.5 23.1 Control sample 1 7.6 2.1 4.2 Control sample 2 19.8 7.0 11.4 Control sample 3 18.1 6.1 10.6 Control sample 4 20.5 7.6 12.2 Control sample 5 12.8 3.8 7.0 Control sample 6 14.9 5.3 8.6 Control sample 7 13.2 4.4 7.8

[0124] Based on Examples 1-10 and Comparative Examples 1-7, and referring to Table 4, it can be seen that by using functional auxiliary additive raw materials containing molybdenum, titanium, and niobium, the first and second powder raw materials can exhibit superior performance in improving high-temperature resistance, corrosion resistance, and wear resistance. If only one or two of molybdenum, titanium, and niobium are used in the functional auxiliary additive raw materials, the improvement in high-temperature resistance, corrosion resistance, and wear resistance is limited, and the effects are merely a simple additive effect. Only when all three are used in combination can a significant improvement effect (1+1>2) be achieved. Furthermore, based on Examples 11-12 and Table 4, it can be seen that when the weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary additive raw material is (0.8-1.2):1:(0.2-0.4), a relatively excellent and stable application effect can be achieved. When the weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary additive raw material is 1:1:0.3, the alloy powder suitable for oil screw surface treatment exhibits the best application effect.

[0125] Combining Examples 1 and 13-14 with Table 4, it can be seen that when the particle size of the alloy powder suitable for oil screw surface treatment is 13-18μm, the synergistic effect between them is better, and it can exhibit excellent and stable improvement in high temperature resistance, corrosion resistance and wear resistance.

[0126] Combining Examples 1 and 16-17 with Table 4, it can be seen that the thickness of the cladding layer in step (2) is 20-40 μm, which can meet the requirements of screw rotor surface treatment and shows excellent and stable high temperature resistance, corrosion resistance and wear resistance improvement effect.

[0127] Combining Examples 1 and 18-21 with Table 4, it can be seen that when using alloy powders suitable for surface treatment of oil screws, the appropriate thermal spraying temperature is 1000-1400℃, and the laser wavelength for laser cladding is 10-12μm, the laser scanning speed is 0.6m / min-1.2m / min, and the laser power density is 10-20kW / cm². 2 All of them can fully combine the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material. The high temperature resistance improvement rate, corrosion resistance improvement rate and wear resistance reduction rate obtained by testing are all excellent.

[0128] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. An alloy powder suitable for surface treatment of oil screws, characterized in that, It includes a first powder raw material, a second powder raw material, and a functional auxiliary mixture raw material; The first powder raw material comprises the following components in parts by weight: 65-75 parts tungsten; 20-25 parts cobalt; Carbon 4-8 parts; 3-5 parts aluminum oxide; The second powder raw material comprises the following components in parts by weight: 9-12 parts chromium; 5-8 parts boron; 4-6 parts silicon; Nickel 50-80 parts; The functional auxiliary mixture raw material comprises the following components in parts by weight: 8-10 parts of molybdenum; 80-90 parts titanium; 3-5 parts of niobium; The weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is (0.8-1.2):1:(0.2-0.4); The alloy powder suitable for oil screw surface treatment is applied by the following application method, including the following steps: (1) Prepare the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material; (2) After mixing the first powder raw material, the second powder raw material and the functional auxiliary mixture raw material, thermal spraying is performed on the surface of the screw rotor, and a cladding layer is obtained by laser cladding to complete the surface treatment of the screw rotor; The thickness of the cladding layer in step (2) is 20-40 μm; In step (2), the temperature of thermal spraying is 1000-1400℃; In step (2), the laser wavelength for laser cladding is 10-12 μm, the laser scanning speed is 0.6 m / min-1.2 m / min, and the laser power density is 10-20 kW / cm². 2 ; The alloy powder suitable for oil screw surface treatment has a particle size of 13-18 μm.

2. The alloy powder suitable for surface treatment of oil screws according to claim 1, characterized in that: The weight ratio of the first powder raw material, the second powder raw material, and the functional auxiliary mixture raw material is 1:1:0.

3.

3. The alloy powder suitable for surface treatment of oil screws according to claim 1, characterized in that: The first powder raw material comprises the following components in parts by weight: 70 parts of tungsten; 22 parts of cobalt; 4 parts carbon; 4 parts aluminum oxide.

4. The alloy powder suitable for surface treatment of oil screws according to claim 1, characterized in that: The second powder raw material comprises the following components in parts by weight: 10 parts chromium; Boron 6 parts; 5 parts silicon; Nickel 65 parts.

5. The alloy powder suitable for surface treatment of oil screws according to claim 1, characterized in that: The functional auxiliary mixture raw material comprises the following components in parts by weight: 10 parts of molybdenum; 85 parts of titanium; Niobium, 5 parts.

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