Wear-resistant shovel blades for engineering machinery and their preparation methods

Abstract

This invention relates to a wear-resistant shovel blade for engineering machinery and its preparation method, belonging to the field of engineering machinery parts manufacturing technology. The specific preparation method involves: after rolling, quenching, and high-temperature tempering, the shovel blade material undergoes carburizing treatment using ion plating. Then, a W transition layer and a WTiTaB boride gradient coating with varying composition are prepared using magnetron sputtering. This invention combines the WTiTaB boride gradient coating, physical vapor deposition, and carburizing technology, which can mitigate the difference in physical properties between the boride coating and the substrate material of the shovel blade, improve the surface hardness and support of the substrate material, and result in high surface hardness, core toughness, and excellent tribological properties. Compared with traditional carburizing processes, the surface hardness is increased by nearly three times, the surface treatment time is shortened by more than 90%, and the wear rate is reduced by 78-83%.

Description

Technical Field

[0001] This invention belongs to the field of engineering machinery parts manufacturing technology, specifically relating to a wear-resistant shovel blade for engineering machinery and its preparation method. Background Technology

[0002] Bulldozers are earthmoving and rock-moving construction machinery that can independently complete various complex earthmoving tasks. They are currently widely used and play an important role in national construction.

[0003] Bulldozing is a cyclical operation, with each cycle involving a series of steps such as cutting, pushing, filling, and leveling. Throughout the bulldozing process, the bulldozer's working mechanism experiences complex forces, including cutting resistance, resistance to the movement of the soil pile in front of the bulldozer blade, resistance to the upward movement of soil chips along the bulldozer blade surface, resistance to the lateral movement of soil chips along the bulldozer blade surface, frictional resistance between the blade cutting edge and the ground, travel resistance, slope resistance, and inertial resistance.

[0004] The blade is the most important and stress-bearing working part of a bulldozer. However, traditional blades cannot meet the actual working requirements of bulldozers, and the alloy steel materials used are expensive, resulting in a shorter service life than expected. Furthermore, this increases energy consumption and reduces work efficiency. Therefore, developing new wear-resistant blades for construction machinery and their manufacturing processes or methods is of great significance.

[0005] Surface coating is one of the important ways to improve the mechanical properties of parts. The coating combines the toughness of the substrate material with the friction-reducing and wear-resistant properties of the coating, greatly improving the original properties of the substrate. Since its successful application in surface modification of parts in the 1970s, nitride single coatings such as TiN have become the most widely used coating materials.

[0006] Currently, there are various deposition methods for coatings, among which magnetron sputtering and multi-arc ion plating are two important methods. Magnetron sputtering deposition is a pulsed unbalanced magnetron sputtering method widely used internationally. Its advantages include the ability to prepare large-area, multi-component, dense, and high-quality coatings. Multi-arc ion plating is an improved vacuum arc ion plating technology. By applying an external magnetic field to improve the arc discharge state, it refines the arc spot and improves the etching of the cathode target, increases the beam density and directionality, reduces the droplet density, and further improves the deposition rate, coating quality, and adhesion performance. This method has a fast deposition rate, high efficiency, uniform coating, and high coating-substrate adhesion strength.

[0007] Because boride coatings possess excellent properties such as high hardness, high strength, chemical stability, heat resistance, and wear resistance, it is expected that the wear resistance of parts can be improved by preparing boride coatings on the surface of parts or by carbonizing the metal surface. Summary of the Invention

[0008] This invention provides a wear-resistant shovel blade for construction machinery and its preparation method, which can improve the service life and wear resistance of current construction machinery shovel blades, increase the working efficiency and service life of construction machinery, and reduce the energy consumption and daily maintenance costs of construction machinery.

[0009] The technical solution of this invention is as follows:

[0010] In one aspect, a method for preparing wear-resistant shovel blades for engineering machinery is disclosed. The shovel blade material is rolled, quenched, and tempered at high temperature, then surface carburized using ion plating. Following this, a W transition layer and a WTiTaB boride gradient coating are deposited on the surface using magnetron sputtering. The deposition process employs one C ion plating target, one W magnetron sputtering target, and one WTiTaB magnetron sputtering composite target. The specific steps include:

[0011] (1) Machining of shovel blade parts: rolling;

[0012] (2) Heat treatment of spade blade parts: Quenching → High-temperature tempering;

[0013] (3) Surface treatment of parts: Place the parts in alcohol and acetone in sequence, and ultrasonically clean each for 30-40 minutes to remove surface impurities and other adhering substances. After thorough drying, place them in a PVD composite coating machine and vacuum to 5.0-5.5×10⁻⁶. -3 Pa, heat to 300-350 ℃, and hold for 30-40 min;

[0014] (4) Surface glow discharge cleaning: Ar gas is introduced at a pressure of 2.0-2.2 Pa and a temperature of 280-300 ℃. The bias power supply voltage is turned on at 650-700 V with a duty cycle of 0.3-0.4. The surface glow discharge cleaning is performed for 30-40 min.

[0015] (5) Surface ion cleaning: adjust the bias voltage to 500-550 V, duty cycle 0.3-0.4, Ar gas pressure 1.2-1.5 Pa, temperature 260-300 ℃, turn on the ion source, ion cleaning for 20-25 min, turn on the arc C target power supply, C target current 100-110 A, ion bombardment for 2-3 min;

[0016] (6) Ion plating and carburizing: The C target ion plating power supply is adjusted to 90-100 A, the Ar gas pressure is 1.0-1.5 Pa, the substrate bias voltage is adjusted to 400-450 V, the temperature is 250-300 ℃, and ion carburizing is carried out for 20-30 min.

[0017] (7) Deposit W transition layer: Ar gas pressure is adjusted to 0.9-1.0 Pa, bias voltage drop is 300-330 V, deposition temperature is 250-300℃, C target current is turned off, W target current is turned on at 100-110 A, and W transition layer is deposited for 5-10 min.

[0018] (8) Deposition of WTiTaB boride gradient coating: Ar gas pressure is adjusted to 0.9-1.0 Pa, bias voltage is adjusted to 230 V, deposition temperature is 230-250 ℃, W target current is turned off, WTiTaB magnetron sputtering target current is turned on to 60 A, and WTiTaB composite layer is deposited for 4-5 min; other parameters remain unchanged, WTiTaB magnetron sputtering target current is increased to 65 A, and WTiTaB composite layer is deposited for 4-5 min; every 4-5 min, the target current is increased by 5 A until the target current is increased to 110 A, and then WTiTaB composite layer is deposited for 4-5 min;

[0019] Post-processing: Turn off the power supply, ion source and gas source of each target. Coating is now complete.

[0020] Preferably, the base material of the shovel blade part is one of Q345, Q460, 45 steel, 40Cr medium carbon steel and its alloy steel.

[0021] Preferably, the carbonization target used in step (6) is a C ion plating target with a particle diameter of 30-50 nm.

[0022] Preferably, the W transition layer deposited in step (7) is a W magnetron sputtering target, and the W powder particles used in the target have a diameter of 50-70 nm.

[0023] Preferably, the WTiTaB boride gradient coating used in step (8) is a WTiTaB magnetron sputtering target with a powder particle diameter of 60-100 nm.

[0024] Preferably, in step (8), the atomic percentage content of each element in the target material powder particles is: W: 50-55 at.%, Ti: 15-25 at.%, Ta: 5-15 at.%, B: 10-20 at.%.

[0025] Secondly, the preparation method described above discloses a spade blade, wherein the spade blade part has a surface carburizing diffusion layer, a W transition layer and a WTiTaB boride gradient coating sequentially outward from the substrate surface.

[0026] This invention ensures sufficient toughness and impact resistance of the core of the scraper blade part through quenching and high-temperature tempering. Ion carburizing treatment of the part surface allows carbon atoms to penetrate into the workpiece, with the carbon concentration gradually decreasing with increasing depth. This facilitates the formation of a high-hardness and high-strength boride gradient diffusion layer, providing a strong supporting substrate and good bonding performance for the subsequent preparation of the WTiTaB boride gradient coating. Furthermore, by preparing a W transition layer and a compositionally gradient WTiTaB boride gradient coating, the performance differences between the boride coating and the substrate material can be mitigated, improving the structural and performance matching, increasing the bonding force between the boride coating and the scraper blade substrate, and enhancing the impact resistance of the boride coating. Simultaneously, in this WTiTaB boride gradient coating, W improves the coating's hardness and chemical diffusion resistance, and enhances its oxidation resistance; Ti improves the coating's hardness and strength; and Ta improves the coating's hardness, strength, compressive strength, wear resistance, and corrosion resistance. The composition-gradient WTiTaB boride coating can prevent the propagation of surface boride coating cracks. The composition gradient is achieved through current parameters, which improves the physical and mechanical properties of the scraper blade workpiece.

[0027] Compared with the prior art, the present invention has the following advantages:

[0028] This invention relates to wear-resistant shovel blades for engineering machinery and their preparation method. It enhances the adhesion between the boride coating and the blade substrate by more than double, reduces friction and wear during machinery operation, and increases surface hardness by more than three times. By employing physical vapor deposition (PVD) for carburizing and coating, the traditional carburizing heat treatment process time is shortened by more than 95%, increasing the average service life of ordinary shovel blades by more than three times. Furthermore, it uses the most commonly used and inexpensive ordinary steel instead of expensive special alloy steels such as 31Si2CrMoB, reducing maintenance and upkeep costs by more than 70%. Simultaneously, because the preparation process temperature can be controlled below 350℃, it does not cause changes in the microstructure and surface dimensions of the blade component, allowing for direct installation and use after processing. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the surface structure of the wear-resistant shovel blade part for engineering machinery prepared according to the present invention.

[0030] In the figure: 1. Part substrate, 2. Surface carburized diffusion layer, 3. W transition layer, 4. WTiTaB boride gradient coating.

[0031] Figure 2 This is the surface morphology of the shovel blade coating prepared in Example 1 of the present invention.

[0032] Figure 3 This is the surface wear morphology of the spade blade coating prepared in Example 1 of the present invention.

[0033] Figure 4 This is the second surface wear morphology of the spade blade coating prepared in Example 1 of the present invention.

[0034] Figure 5 This is a comparison chart of the wear rate of the wear-resistant shovel blade for engineering machinery prepared in Embodiment 1 of the present invention and a traditional shovel blade. Detailed Implementation

[0035] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0036] Example 1

[0037] like Figure 1 As shown, this embodiment provides a method for preparing a wear-resistant shovel blade for engineering machinery. The shovel blade uses a 30 mm thick 40Cr formed steel plate. After rolling, quenching, and high-temperature tempering, the blade material undergoes surface carburizing treatment using ion plating. Then, a W transition layer and a WTiTaB boride gradient coating are deposited on the surface using magnetron sputtering. During deposition, one C ion plating target, one W magnetron sputtering target, and one WTiTaB magnetron sputtering composite target are used. The atomic percentage content of each element in the composite target is: W: 50 at.%, Ti: 25 at.%, Ta: 15 at.%, B: 10 at.%. The specific steps include:

[0038] (1) Processing of blade parts: 40Cr forming steel plate with a thickness of 30 mm is rolled into a blank with a size of 300 mm × 250 mm, deburred with a grinding wheel, and chamfered to C5.

[0039] (2) Heat treatment of shovel blade parts: Quenching (800℃, water cooling) → High temperature tempering (500℃, holding time: 160min; cooling method: air cooling);

[0040] (3) Surface treatment of parts: Place the parts in alcohol and acetone in sequence, and ultrasonically clean for 30 minutes each to remove surface impurities and other adhering substances. After thorough drying, quickly place them in a PVD composite coating machine and vacuum to 5.0×10. -3 Pa, heat to 300℃, and hold for 30 min;

[0041] (4) Surface glow discharge cleaning: Ar gas is introduced at a pressure of 2.0 Pa and a temperature of 280 °C. The bias power supply is turned on with a voltage of 650 V and a duty cycle of 0.3. The surface glow discharge cleaning is performed for 30 min.

[0042] (5) Surface ion cleaning: the bias voltage is adjusted to 500 V, the duty cycle is 0.3, the Ar gas pressure is 1.2 Pa, the temperature is 260 ℃, the ion source is turned on, the ion cleaning is performed for 20 min, the arc C target power supply is turned on, the C target current is 100 A, and the ion bombardment is performed for 2 min.

[0043] (6) Ion plating and carburizing: The C powder used in the target material has a particle diameter of 30nm. The C target ion plating power supply is set to 90A, the Ar gas pressure is 1.0Pa, the substrate bias voltage is set to 400V, the temperature is 250℃, and ion carburizing is carried out for 20min.

[0044] (7) Deposition of W transition layer: The W powder used in the target material has a particle diameter of 50 nm, the Ar gas pressure is adjusted to 0.9 Pa, the bias voltage drop is 300 V, the deposition temperature is 250 ℃, the C target current is turned off, the W target current is turned on at 100 A, and the W transition layer is deposited for 6 min.

[0045] (8) Deposition of WTiTaB boride gradient coating: The powder particle diameter used for the target material is 60 nm. The Ar gas pressure is adjusted to 0.9 Pa, the bias voltage is adjusted to 230 V, the deposition temperature is 230 ℃, the W target current is turned off, the WTiTaB magnetron sputtering target current is turned on to 60 A, and the WTiTaB composite layer is deposited for 4 min; other parameters remain unchanged, the WTiTaB magnetron sputtering target current is increased to 65 A, and the WTiTaB composite layer is deposited for 4 min; every 4 min, the target current is increased by 5 A until the target current is increased to 110 A, and the WTiTaB composite layer is deposited for 4 min again;

[0046] (9) Post-processing: Turn off the power supply, ion source and gas source of each target, and the coating is finished.

[0047] The WTiTaB wear-resistant coating prepared in this embodiment achieved a surface microhardness of HV2730-2760 (testing equipment: HM2000S nano-indentation hardness tester), which is more than 3 times higher than the surface hardness (HV640-660) of the traditional carburizing process alone; the bonding strength is 75-80 N, which is 150-200% higher than the bonding strength (25-30 N) of the PVD coating alone; the coating thickness is approximately 1.7 μm, the surface roughness reaches Ra 12-15 μm, and the surface morphology is as follows. Figure 2As shown (2k times). Under the same friction test conditions (CETR UMT ball-disc friction and wear tester, reciprocating linear motion, grinding balls made of bearing steel with a surface hardness of HRC55-60, load of 100 N, sliding speed of 10 mm / s, grinding time of 30 min), the wear rate of the wear-resistant coating prepared in this invention is only 2.25-2.35×10. -6 mm 3 / N·m, the surface scratch morphology of the coating is as follows Figure 3 and Figure 4 As shown; compared with ordinary shovel blade samples treated by traditional carburizing process, the wear rate was reduced by 80-83%, and the wear rate was significantly lower than that of ordinary shovel blade samples treated by traditional carburizing process. Figure 5 As shown, the entire effective carburizing and coating process takes approximately 1.3 hours, saving more than 90-95% of the processing time compared to traditional carburizing processes.

[0048] Example 2

[0049] The method for preparing the wear-resistant shovel blade for engineering machinery involves using a 25mm thick Q460 steel plate as the blade material. After rolling, quenching, and high-temperature tempering, the blade material undergoes surface carburizing treatment using ion plating. Then, a W transition layer and a WTiTaB boride gradient coating are deposited on the surface using magnetron sputtering. The deposition process employs one C ion plating target, one W magnetron sputtering target, and one WTiTaB magnetron sputtering composite target. The atomic percentage content of each element on the composite target is: W: 55 at.%, Ti: 20 at.%, Ta: 15 at.%, B: 15 at.%. The specific steps include:

[0050] (1) Processing of blade parts: Q460 steel forming plate with a thickness of 25 mm is rolled into a blank with a size of 250 mm × 200 mm, the surface is deburred and the chamfer is C2.

[0051] (2) Heat treatment of shovel blade parts: Quenching (900℃, oil cooling) → High temperature tempering (650℃, holding time: 150min; cooling method: air cooling);

[0052] (3) Surface treatment of parts: The parts are placed in alcohol and acetone in sequence and ultrasonically cleaned for 40 min each to remove surface impurities and other adhering substances. After being fully dried, they are quickly placed in a PVD composite coating machine and vacuumed to 5.5 × 10⁻⁶. -3 Pa, heat to 350℃, and hold for 40 min;

[0053] (4) Surface glow discharge cleaning: Ar gas is introduced at a pressure of 2.2 Pa and a temperature of 300 ℃. The bias power supply is turned on with a voltage of 700V and a duty cycle of 0.3. The surface glow discharge cleaning is performed for 40 min.

[0054] (5) Surface ion cleaning: the bias voltage is adjusted to 550 V, the duty cycle is 0.4, the Ar gas pressure is 1.5 Pa, the temperature is 300 ℃, the ion source is turned on, the ion cleaning is performed for 25 min, the arc C target power supply is turned on, the C target current is 110 A, and the ion bombardment is performed for 3 min.

[0055] (6) Ion plating and carburizing: The C powder used in the target material has a particle diameter of 50 nm; the C target ion plating power supply is set to 100A, the Ar gas pressure is 1.5 Pa, the substrate bias voltage is set to 450 V, the temperature is 300 ℃, and ion carburizing is carried out for 30 min.

[0056] (7) Deposition of W transition layer: The diameter of W powder particles used in the target material is 70 nm; Ar gas pressure is adjusted to 0.9 Pa, bias voltage drop is 300 V, deposition temperature is 280 ℃, C target current is turned off, W target current is turned on at 100 A, and W transition layer is deposited for 10 min.

[0057] (8) Deposition of WTiTaB boride gradient coating: The powder particle diameter used for the target is 90 nm; the Ar gas pressure is adjusted to 1.0 Pa, the bias voltage is adjusted to 230 V, the deposition temperature is 250 ℃, the W target current is turned off, the WTiTaB magnetron sputtering target current is turned on to 60 A, and the WTiTaB composite layer is deposited for 4.5 min; other parameters remain unchanged, the WTiTaB magnetron sputtering target current is increased to 65 A, and the WTiTaB composite layer is deposited for 4.5 min; every 4.5 min, the target current is increased by 5 A until the target current is increased to 110 A, and then the WTiTaB composite layer is deposited for 5 min;

[0058] (9) Post-processing: Turn off the power supply, ion source and gas source of each target, and the coating is finished.

[0059] The WTiTaB wear-resistant coating prepared in this embodiment has a surface microhardness of HV2800-2810, a bonding strength of 80-84 N, a coating thickness of approximately 2.1 μm, a surface roughness of Ra 14-15 μm, and a total effective carburizing and coating time of approximately 1.5 h.

[0060] Example 3

[0061] The method for preparing the wear-resistant shovel blade for engineering machinery involves using a 30 mm thick shaped steel plate made of 45 steel. After rolling, quenching, and high-temperature tempering, the blade material undergoes surface carburizing treatment using ion plating. Then, a W transition layer and a WTiTaB boride gradient coating are deposited on the surface using magnetron sputtering. The deposition process employs one C ion plating target, one W magnetron sputtering target, and one WTiTaB magnetron sputtering composite target. The atomic percentage content of each element on the composite target is: W: 50 at.%, Ti: 15 at.%, Ta: 15 at.%, B: 20 ​​at.%. The specific steps include:

[0062] (1) Processing of blade parts: 30 mm thick 45 steel forming steel plate is rolled into a blank with a size of 250 mm × 200 mm, deburred with a grinding wheel, and chamfered to C2.

[0063] (2) Heat treatment of shovel blade parts: Quenching (900℃, water cooling) → High temperature tempering (610℃, holding time: 200min; cooling method: air cooling).

[0064] (3) Surface treatment of parts: Place the parts in alcohol and acetone in sequence, and ultrasonically clean for 35 minutes each to remove surface impurities and other adhering substances. After drying thoroughly, quickly place them in a PVD composite coating machine and vacuum to 5.1×10⁻⁶. -3 Pa, heat to 310℃, and hold for 35 min;

[0065] (4) Surface glow discharge cleaning: Ar gas is introduced at a pressure of 2.1 Pa and a temperature of 290 ℃. The bias power supply is turned on with a voltage of 680V and a duty cycle of 0.3. The surface glow discharge cleaning is performed for 35 min.

[0066] (5) Surface ion cleaning: the bias voltage is adjusted to 530 V, the duty cycle is 0.3, the Ar gas pressure is 1.3 Pa, the temperature is 280 ℃, the ion source is turned on, the ion cleaning is performed for 20 min, the arc C target power supply is turned on, the C target current is 105 A, and the ion bombardment is performed for 3 min.

[0067] (6) Ion plating and carburizing: The C powder used for the target material has a particle diameter of 40 nm; the C target ion plating power supply is set to 95A, the Ar gas pressure is 1.1 Pa, the substrate bias voltage is set to 430 V, the temperature is 280 ℃, and ion carburizing is carried out for 25 min.

[0068] (7) Deposition of W transition layer: The W powder used in the target material has a particle diameter of 60 nm; Ar gas pressure is adjusted to 1.0 Pa, bias voltage drop is 300 V, deposition temperature is 250 ℃, C target current is turned off, W target current is turned on at 105 A, and W transition layer is deposited for 8 min.

[0069] (8) Deposition of WTiTaB boride gradient coating: The powder particle diameter used for the target is 75 nm; the Ar gas pressure is adjusted to 1.0 Pa, the bias voltage is adjusted to 230 V, the deposition temperature is 240 ℃, the W target current is turned off, the WTiTaB magnetron sputtering target current is turned on to 60 A, and the WTiTaB composite layer is deposited for 4.5 min; other parameters remain unchanged, the WTiTaB magnetron sputtering target current is increased to 65 A, and the WTiTaB composite layer is deposited for 4.5 min; every 4.5 min, the target current is increased by 5 A until the target current is increased to 110 A, and the WTiTaB composite layer is deposited for another 4.5 min;

[0070] (9) Post-processing: Turn off the power supply, ion source and gas source of each target, and the coating is finished.

[0071] The WTiTaB wear-resistant coating prepared in this embodiment has a surface microhardness of HV2760-2790, a bonding strength of 78-83 N, a coating thickness of approximately 1.9 μm, a surface roughness of Ra 12-14 μm, and a total effective carburizing and coating time of approximately 1.4 h.

[0072] Although the present invention has been described in detail with reference to the accompanying drawings and preferred embodiments, the invention is not limited thereto. Various equivalent modifications or substitutions can be made to the embodiments of the invention by those skilled in the art without departing from the spirit and essence of the invention, and such modifications or substitutions should all be within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A method of making a wear-resistant shovel blade for a construction machine, characterized by, After the shovel blade part material is rolled, quenched and high-temperature tempered, the surface is treated by ion plating, then a W transition layer and a WTiTaB boride gradient coating are deposited on the surface by magnetron sputtering, in the deposition process, one C ion plating target, one W magnetron sputtering target and one WTiTaB magnetron sputtering composite target are used, and the specific steps include the following steps: (1) shovel blade part processing: rolling; (2) shovel blade part heat treatment: quenching→high-temperature tempering; (3) Parts surface treatment: the parts are sequentially put into alcohol and acetone, ultrasonic cleaning for 30-40 min, respectively, to remove surface impurities and attachments, and then put into PVD composite plating film machine after drying sufficiently, vacuum extraction to (5.0-5.5) x 10 -3 Pa, heated to 300-350℃, and kept for 30-40 min; (4) surface glow cleaning: Ar gas is passed, the pressure is 2.0-2.2 Pa, the temperature is 280-300 ℃, the bias voltage power supply voltage is opened to 650-700 V, the duty cycle is 0.3-0.4, and the surface glow discharge cleaning is performed for 30-40 min; (5) surface ion cleaning: the bias voltage is adjusted to 500-550 V, the duty cycle is 0.3-0.4, the Ar gas pressure is 1.2-1.5 Pa, the temperature is 260-300 ℃, the ion source is turned on, the ion cleaning is performed for 20-25 min, the C target current is 100-110 A, and the ion bombardment is performed for 2-3 min; (6) ion plating carburizing: the C target ion plating power supply is adjusted to 90-100 A, the Ar gas pressure is 1.0-1.5 Pa, the substrate bias voltage is adjusted to 400-450 V, the temperature is 250-300 ℃, and the ion carburizing is performed for 20-30 min; (7) depositing a W transition layer: the Ar gas pressure is adjusted to 0.9-1.0 Pa, the bias voltage is reduced to 300-330 V, the deposition temperature is 250-300 ℃, the C target current is turned off, the W target current is turned on to 100-110 A, and the W transition layer is deposited for 5-10 min; (8) depositing a WTiTaB boride gradient coating: the Ar gas pressure is adjusted to 0.9-1.0 Pa, the bias voltage is adjusted to 230 V, the deposition temperature is 230-250 ℃, the W target current is turned off, the WTiTaB magnetron sputtering target current is turned on to 60 A, and the WTiTaB composite layer is deposited for 4-5 min; other parameters remain unchanged, the WTiTaB magnetron sputtering target current is increased to 65 A, and the WTiTaB composite layer is deposited for 4-5 min; every 4-5 min, the target current is increased by 5 A until the target current is increased to 110 A, and then the WTiTaB composite layer is deposited for 4-5 min; Post-processing: turn off the target power supply, ion source and gas source, and the coating is completed.

2. The method for preparing wear-resistant shovel blades for engineering machinery as described in claim 1, characterized in that, The shovel blade part substrate material is one of Q345, Q460, 45 steel, 40Cr medium carbon steel and alloy steel.

3. The method of making a wear plate for an earthmoving machine according to claim 1, wherein, The C ion plating target material used in step (6) is used for ion plating carburizing, and the C powder particle diameter of the target material is 30-50 nm.

4. The method of making a wear plate for a construction machine according to claim 1, wherein The W magnetron sputtering target material used in step (7) is used for depositing a W transition layer, and the W powder particle diameter of the target material is 50-70 nm.

5. The method of making a wear plate for an earthmoving machine according to claim 1, wherein, The WTiTaB magnetron sputtering target material used in step (8) is used for depositing a WTiTaB boride gradient coating, and the powder particle diameter of the target material is 60-100 nm.

6. The method for preparing wear-resistant shovel blades for engineering machinery as described in claim 1, characterized in that, The WTiTaB powder particles used in the target material in step (8) have the following atomic percentage content of each element: W: 50-55 at.%, Ti: 15-25 at.%, Ta: 5-15 at.%, and B: 10-20 at.%.

7. The spade blade prepared by the production method according to any one of claims 1 to 6, characterized in that, The surface of the shovel blade part base body (1) has, in sequence from outside, a surface carburizing diffusion layer (2), a W transition layer (3), and a WTiTaB boride gradient coating (4).

Images