Method for preparing diamond / high-entropy alloy transition layer martensitic stainless steel blade

Abstract

The application relates to a preparation method of a diamond / high-entropy alloy transition layer martensitic stainless steel blade, belongs to the technical field of metal surface coating treatment, solves the technical problem that a diamond coating cannot be directly grown on the surface of a martensitic stainless steel blade, and sequentially comprises the following steps: the material of the blade base body is martensitic stainless steel; firstly, micron-sized micro-pyramids are formed into an array on the surface of the blade base body, and a conical blind hole is prepared on the top surface (upper bottom surface) of each micro-pyramid; then, a high-entropy alloy transition layer is prepared on the surface of the blade base body by using a magnetron sputtering or double-layer glow ion metal infiltration process, the high-entropy alloy transition layer completely fills the conical blind hole and covers the pyramid array; finally, the surface of the blade blank is mechanically bred, and then carbonization treatment and diamond growth are carried out by using a microwave plasma chemical vapor deposition technology, so that a diamond / high-entropy alloy coating with high hardness, good wear resistance and good corrosion resistance is formed on the surface of the blade.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of metal surface coating treatment, and particularly relates to a preparation method of a diamond / high-entropy alloy transition layer martensitic stainless steel blade. BACKGROUND

[0002] Cutters play a very important role in the development of manufacturing industry. At present, domestic researchers use martensitic stainless steel to make blades. However, the wear resistance and strength of the steel cannot meet the needs of high-quality blade cutting, and the service life of the blade is short, which restricts the development of the martensitic stainless steel blade.

[0003] Diamond has extremely high hardness, and diamond cutters are widely used in cutting difficult-to-machine metal materials. Diamond-coated cutting tools have excellent mechanical properties, higher working efficiency and longer service life, and have good application prospects. However, the base material of the blade is steel. In the process of preparing diamond-coated cutters, although iron, cobalt and nickel elements can promote the formation of graphite, they are not conducive to the growth of diamond coating, and the diamond coating is easy to fall off. Therefore, directly preparing diamond coating on the surface of the steel base material to prolong its service life is not an effective solution.

[0004] High-entropy alloy is an alloy composed of five or more metal elements in equal atomic ratio or near equal atomic ratio. Its unique high-entropy effect, lattice distortion effect, delayed diffusion effect and cocktail effect make it have many excellent properties. In the Chinese patent document "High-entropy alloy surface carbide / diamond coating and preparation method thereof" (application number: 202110517748.9), it is disclosed that high-entropy alloy surface can effectively form diamond coating, but the coating has poor adhesion to the substrate, and the coating is easy to fall off. In the Chinese patent document "Mo-based high-entropy alloy and its application" (application number: 202211513271.8), a method for growing diamond coating on Mo-based high-entropy alloy is disclosed. The carbonization treatment time is 30 minutes. The diamond coating prepared by this method has certain corrosion resistance and wear resistance, but the diamond coating will still fall off under external force, which cannot meet the application requirements of the blade.

[0005] In summary, it is still difficult to prepare a continuous diamond coating with high adhesion on the surface of the martensitic stainless steel blade substrate. SUMMARY

[0006] The main purpose of the present application is to overcome the deficiencies in the prior art and solve the technical problem that diamond coating cannot be directly grown on the surface of the martensitic stainless steel blade. The present application provides a preparation method of a diamond / high-entropy alloy transition layer martensitic stainless steel blade.

[0007] The design concept of the application is that the material of the blade base is martensitic stainless steel, first, an array of micron-sized micro-pyramids is formed on the surface of the blade base, and a conical blind hole is prepared on the top surface (upper bottom surface) of each micro-pyramid; then, a high-entropy alloy transition layer is prepared on the surface of the blade base by using magnetron sputtering or double-layer glow ion metal infiltration process, so that the high-entropy alloy transition layer completely fills the conical blind hole and covers the array of micro-pyramids; finally, the surface of the blade blank is mechanically bred, and then carbonized and treated by microwave plasma chemical vapor deposition technology, and diamond is grown, to form a diamond / high-entropy alloy coating on the surface of the blade, which has high hardness, good wear resistance and corrosion resistance.

[0008] The application is implemented by the following technical scheme: a method for preparing a diamond / high-entropy alloy transition layer martensitic stainless steel blade, comprising the following steps:

[0009] S1, blade base pretreatment: place the martensitic stainless steel blade base in an argon protective atmosphere for annealing treatment, the annealing temperature is 600 DEG C, the holding time is 2h, then cool to room temperature with the furnace, and take out for standby; the pretreatment process can reduce the residual stress in the blade base, thereby providing an excellent base material for the subsequent process, avoiding the peeling of the coating material, and prolonging the service life of the blade;

[0010] S2, laser processing of the blade base: after the blade base pretreated in step S1 is polished and cleaned, it is clamped on the laser processing equipment, and a pyramid array is processed on the two side surfaces of the blade base; the pyramid array comprises a plurality of micro-pyramids arranged closely, and the shape and size of the micro-pyramids are as follows: the upper bottom surface diameter of the micro-pyramid is 10-500 μm, the lower bottom surface diameter of the micro-pyramid is 1.2-3 times the upper bottom surface diameter of the micro-pyramid, the height of the micro-pyramid is 10-300 μm, and the distance between the micro-pyramids is equal to the diameter of the lower bottom surface of the micro-pyramid; a conical blind hole is arranged at the center of the upper bottom surface of the micro-pyramid, the diameter of the conical blind hole is 5-100 μm, and the depth of the conical blind hole is 5-200 μm;

[0011] S3, preparing a high-entropy alloy transition layer on the surface of the blade base, comprising the following steps:

[0012] S3-1, using an HCl solution with a concentration of 0.1 mol / L to acid wash the blade base after laser processing in step S2, to remove the oxides on the surface of the blade base after laser processing, and then using an alcohol solution to ultrasonically clean the blade base, the ultrasonic cleaning time being 10 min;

[0013] S3-2, according to the height of the pyramid array, a high-entropy alloy transition layer is prepared on the surface of the blade base in the following manner:

[0014] 1) When 10 pm ≤ height of the circular array < 50 pm, a high-entropy alloy transition layer is prepared on the surface of the blade substrate by a magnetron sputtering process, including the following steps: first, the blade substrate prepared in step S3-1 is placed as a substrate in a magnetron sputtering chamber, and a high-entropy alloy is placed as a target material in the magnetron sputtering chamber, a vacuum pump is started to vacuum the magnetron sputtering chamber to a pressure of 1.5 × 10 -3 Pa; then, argon gas is introduced into the magnetron sputtering chamber as a protective gas, the flow rate of the argon gas is 70 sccm, when the pressure in the magnetron sputtering chamber is 0.5 Pa, the magnetron sputtering power is turned on to perform magnetron sputtering on one side of the blade substrate, the power of the magnetron sputtering power supply is 150 W, the magnetron sputtering time is 180 min-360 min, a bias voltage is applied during the magnetron sputtering process, the bias voltage is -150 V, the application of the bias voltage during the magnetron sputtering process can effectively improve the adhesion between the blade and the thin film, the high-entropy alloy transition layer is prepared on one side of the blade substrate by magnetron sputtering, the high-entropy alloy transition layer fills the conical blind hole of the micro circular array and completely covers the circular array; finally, after the magnetron sputtering process is completed, the magnetron sputtering power supply is turned off, and the blade blank is taken out for standby;

[0015] 2) When 50 pm ≤ height of the circular array ≤ 300 pm, a high-entropy alloy transition layer is prepared on the surface of the blade substrate by a double-layer glow ion metal infiltration process, including the following steps:

[0016] First, the blade substrate prepared in step S3-1 is placed in a double-layer glow metal infiltration furnace, argon gas is introduced into the double-layer glow metal infiltration furnace as a protective gas, the flow rate of the argon gas is 70 sccm; then, the double-layer glow metal infiltration furnace is started, and the high-entropy alloy is infiltrated into the surface of the blade substrate, the metal infiltration time is 180 min-360 min, the high-entropy alloy transition layer is prepared on the surface of the blade substrate by double-layer glow ion metal infiltration, the high-entropy alloy transition layer fills the conical blind hole of the micro circular array and completely covers the circular array; finally, the blade blank is taken out from the double-layer glow metal infiltration furnace, and the surface of the blade blank is finely polished for standby;

[0017] S4, mechanical breeding: diamond powder with a particle size of 50 nm-100 nm is uniformly applied to the surface of the blade blank, and then the blade is immersed in a diamond suspension for ultrasonic treatment for 10 min;

[0018] S5, carbonization treatment: first, the blade blank after the mechanical breeding in step S4 is placed in the microwave plasma chemical vapor deposition carbonization chamber, the mechanical pump is opened, the gas pressure in the carbonization chamber is pumped to a vacuum state, then hydrogen is introduced, the hydrogen flow is 400sccm, when the gas pressure in the carbonization chamber is 0.4 KPa, the microwave power is turned on, the power of the microwave power supply is 0.6 kW; then, when the power of the microwave power supply is increased to 1kW-2.5kW, the gas pressure in the carbonization chamber reaches 2kPa-5kPa, methane gas with a volume concentration of 1%-3% is introduced for carbonization treatment, the flow rate of methane is 40sccm-120sccm, the carbonization treatment temperature is 600℃-700℃, the carbonization treatment time is 60min-180min, and the martensitic stainless steel blade with diamond / high-entropy alloy transition layer is prepared.

[0019] Further, in the step S3-2, the high-entropy alloy is Mo 0.5 (TiZrTaW) 0.5 Or ZrNbTaMo.

[0020] The beneficial effects of the present application are:

[0021] 1), the present application prepares a circular array on the surface of the blade, so that the combination between the high-entropy alloy transition layer and the blade substrate is more firm, and then the combination between the martensitic stainless steel substrate and the diamond coating is improved through the high-entropy alloy transition layer;

[0022] 2), in the carbonization process, the carbonization treatment temperature of the microwave plasma chemical vapor deposition is reduced to 600℃-700℃, which does not change the microstructure of the martensitic steel.

[0023] In summary, the continuous diamond coating grown on the surface of the blade has stronger bonding force and stronger adhesion, the strength, wear resistance and corrosion resistance of the prepared blade are improved, the working efficiency is higher and the service life is longer, and the present application has a wide application prospect in the field of surface hardening of the blade. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 The process flow chart of the diamond / high-entropy alloy coated blade prepared by the present application;

[0025] Figure 2 The SEM surface morphology of the martensitic stainless steel blade with diamond / high-entropy alloy transition layer prepared in example 1; wherein the methane concentration is 3%, and the carbonization treatment time is 120min;

[0026] Figure 3 The SEM surface morphology of the blade after carbonization without high-entropy alloy transition layer; wherein the methane concentration is 3%, and the carbonization treatment time is 120min;

[0027] Figure 4 SEM surface morphology of the martensitic stainless steel blade with diamond / high-entropy alloy transition layer prepared in Example 2; wherein the methane concentration is 3%, and the carbonization treatment time is 180 min. DETAILED DESCRIPTION

[0028] The application will be further described in detail below in combination with the drawings and examples. Example 1

[0029] The material of the blade substrate in this example 1 is martensitic stainless steel; the high-entropy alloy transition layer is Mo-based high-entropy alloy, and the nominal composition is Mo 0.5 (TiZrTaW) 0.5 , and the atomic ratio of Ti element, Zr element, Ta element and W element is equal.

[0030] As shown in the diamond / high-entropy alloy transition layer martensitic stainless steel blade preparation method, comprising the following steps: Figure 1 S1, blade substrate pretreatment: the martensitic stainless steel blade substrate is placed in an argon protective atmosphere for annealing treatment, the annealing temperature is 600 DEG C, the holding time is 2h, then the furnace is cooled to room temperature, and then taken out for standby;

[0031] S2, blade substrate laser processing: the blade substrate pretreated in step S1 is taken, polished and cleaned, and then clamped on the laser processing equipment, and a circular table array is processed on both sides of the blade substrate; the circular table array comprises a plurality of micro circular tables arranged closely, and the shape and size of the micro circular table are as follows: the upper bottom surface diameter of the micro circular table is 10 μm, the lower bottom surface diameter of the micro circular table is 15 μm, the height of the micro circular table is 10 μm, and the spacing between the micro circular tables is 15 μm; a conical blind hole is arranged at the center of the upper bottom surface of the micro circular table, the diameter of the conical blind hole is 5 μm, and the depth of the conical blind hole is 5 μm;

[0032] S3, preparing a high-entropy alloy transition layer on the surface of the blade substrate, comprising the following steps:

[0033] S3-1, using a 0.1 mol / L HCl solution to acid wash the blade substrate after laser processing in step S2, to remove the oxides on the surface of the blade substrate after laser processing, and then using an alcohol solution to ultrasonically clean the blade substrate, and the ultrasonic cleaning time is 10 min;

[0034] S3-2, according to the height of the circular table array, a high-entropy alloy transition layer is prepared on the surface of the blade substrate in the following manner:

[0035]

[0036] ​Since the height of the cone array in this embodiment 1 is 10 pm, a high-entropy alloy transition layer is prepared on the surface of the blade substrate by magnetron sputtering process, including the following steps: first, the blade substrate prepared in step S3-1 is placed in the magnetron sputtering chamber as a substrate, and Mo 0.5 (TiZrTaW) 0.5 The high-entropy alloy is placed as a target in the magnetron sputtering chamber, and the vacuum pump is started to vacuum the magnetron sputtering chamber to a pressure of 1.5 x 10 -3 Pa; then, argon gas is introduced into the magnetron sputtering chamber as a protective gas, the flow rate of argon gas is 70 sccm, when the pressure in the magnetron sputtering chamber is 0.5 Pa, the magnetron sputtering power is turned on to perform magnetron sputtering on one side of the blade substrate, the power of the magnetron sputtering power supply is 150 W, the magnetron sputtering time is 180 min, a bias voltage is applied during the magnetron sputtering process, the bias voltage is -150 V, the magnetron sputtering process is completed to prepare a high-entropy alloy transition layer on one side of the blade substrate, the high-entropy alloy transition layer fills the conical blind hole of the micro-cone and completely covers the cone array; finally, the blade substrate is taken out and turned over, and the above-mentioned magnetron sputtering step is repeated to perform magnetron sputtering on the other side of the blade substrate to prepare a high-entropy alloy transition layer, after the magnetron sputtering process is completed, the magnetron sputtering power supply is turned off, and the blade substrate is taken out for standby;

[0037] S4, mechanical breeding: diamond powder with a particle size of 50 nm is uniformly applied to the surface of the blade substrate, and then the blade is immersed in a diamond suspension for ultrasonic treatment for 10 min;

[0038] S5, carbonization treatment: first, the blade substrate after mechanical breeding in step S4 is placed in a microwave plasma chemical vapor deposition carbonization chamber, a mechanical pump is turned on, hydrogen gas is introduced after the pressure in the carbonization chamber is vacuumed, the flow rate of hydrogen gas is 400 sccm, the microwave power is turned on when the pressure in the carbonization chamber is 0.4 KPa, the power of the microwave power supply is 0.6 kW; then, when the power of the microwave power supply rises to 1.2 kW and the pressure in the carbonization chamber reaches 2.4 KPa, methane gas with a volume concentration of 3% is introduced for carbonization treatment, the flow rate of methane is 120 sccm, the carbonization treatment temperature is 700℃, the carbonization treatment time is 120 min, and a diamond coating with high hardness, high wear resistance and corrosion resistance is generated on the carbide surface of the high-entropy alloy transition layer during the carbonization treatment process. After the carbonization holding is completed, the power is gradually reduced to zero, and the power supply is turned off to obtain a martensitic stainless steel blade with a diamond / high-entropy alloy transition layer.

[0039] The surface structure and morphology of the martensitic stainless steel blade with a diamond / high-entropy alloy transition layer prepared in this embodiment 1 are observed by scanning electron microscopy, and the SEM surface morphology is shown in Figure 2 The continuous particle coating in the figure is a Mo 0.5 (TiZrTaW)0.5 The high-entropy alloy transition layer of the blade surface grows a continuous diamond coating, and the diamond coating is not peeled off.

[0040] Compared with Example 1, the SEM surface morphology of the blade plated with the high-entropy alloy transition layer after carbonization is shown in Figure 3 The carbonization process parameters are: the methane concentration is 3%, the carbonization temperature is 700 DEG C, the carbonization time is 120 min, Figure 3 The content of the medium white particles is low, indicating that the diamond particles are not easy to grow directly on the blade surface and are prone to peeling off. Example 2

[0041] The diamond / high-entropy alloy transition layer martensitic stainless steel blade preparation method is shown in Figure 1 The blade substrate and the high-entropy alloy transition layer in this example 2 are the same as in Example 1, and the steps S1-S4 in this example 2 are the same as in Example 1, the only difference is that the carbonization treatment in step S5:

[0042] First, the blade blank after mechanical breeding in step S4 is placed in a microwave plasma chemical vapor deposition carbonization chamber, a mechanical pump is opened, and the gas pressure in the carbonization chamber is vacuumed to a vacuum state, then hydrogen is introduced, the hydrogen flow is 400 sccm, when the gas pressure in the carbonization chamber is 0.4 KPa, the microwave power is opened, the power of the microwave power is 0.6 kW; Then, when the power of the microwave power is raised to 1.2 kW and the gas pressure in the carbonization chamber reaches 2.4 kPa, methane gas with a volume concentration of 3% is introduced for carbonization treatment, the flow rate of methane is 120 sccm, the carbonization treatment temperature is 700 DEG C, and the carbonization treatment time is 180 min, and a martensitic stainless steel blade with a diamond / high-entropy alloy transition layer is prepared.

[0043] The surface structure and morphology of the martensitic stainless steel blade with a diamond / high-entropy alloy transition layer prepared in this example 2 are observed by scanning electron microscope, and the SEM surface morphology is shown in Figure 4 The continuous particle coating in the figure is plated with Mo 0.5 (TiZrTaW) 0.5 The high-entropy alloy transition layer of the blade surface grows a continuous diamond coating, and the diamond coating is not peeled off. Example 3

[0044] The diamond / high-entropy alloy transition layer martensitic stainless steel blade preparation method is shown in Figure 1 The blade substrate and the high-entropy alloy transition layer in this example 3 are the same as in Example 1, and the steps S1-S4 in this example 3 are the same as in Example 1, the only difference is that the carbonization treatment in step S5:

[0045] First, the blade blank after mechanical breeding in step S4 is placed in a microwave plasma chemical vapor deposition carbonization chamber. The mechanical pump is turned on to evacuate the air pressure in the carbonization chamber to a vacuum state, and then hydrogen gas is introduced at a flow rate of 400 sccm. When the air pressure in the carbonization chamber reaches 0.4 kPa, the microwave power supply is turned on with a power of 0.6 kW. Then, when the power of the microwave power supply is increased to 1.2 kW and the air pressure in the carbonization chamber reaches 2.4 kPa, methane gas with a volume concentration of 3% is introduced for carbonization treatment at a flow rate of 40 sccm. The carbonization treatment temperature is 700℃ and the carbonization treatment time is 60 min, thus obtaining a martensitic stainless steel blade with a diamond / high entropy alloy transition layer. Example 4

[0046] like Figure 1 The method for preparing diamond / high-entropy alloy transition layer martensitic stainless steel cutting tools shown in Example 4 is the same as that in Example 1, where the materials of the cutting tool substrate and the high-entropy alloy transition layer are the same. Steps S1 to S4 in Example 4 are also the same as in Example 1, with the only difference being the carbonization treatment in step S5.

[0047] First, the blade blank after mechanical breeding in step S4 is placed in a microwave plasma chemical vapor deposition carbonization chamber. The mechanical pump is turned on to evacuate the air pressure in the carbonization chamber to a vacuum state, and then hydrogen gas is introduced at a flow rate of 400 sccm. When the air pressure in the carbonization chamber reaches 0.4 kPa, the microwave power supply is turned on with a power of 0.6 kW. Then, when the power of the microwave power supply is increased to 1.2 kW and the air pressure in the carbonization chamber reaches 2.4 kPa, methane gas with a volume concentration of 3% is introduced for carbonization treatment at a flow rate of 60 sccm. The carbonization treatment temperature is 650℃ and the carbonization treatment time is 120 min. Compared with Examples 1 to 3, the carbonization treatment in Example 4 has reduced the temperature and extended the growth time. Similarly, a diamond film with high hardness, high wear resistance, and corrosion resistance can be generated on the surface of the carbide on the high-entropy alloy transition layer, thus obtaining a martensitic stainless steel blade with a diamond / high-entropy alloy transition layer. Example 5

[0048] like Figure 1 The method for preparing diamond / high-entropy alloy transition layer martensitic stainless steel cutting tools shown in Example 5 uses martensitic stainless steel as the material of the cutting tool substrate. The difference lies in that the nominal composition of the high-entropy alloy transition layer is TiZrNbTaMo, and the atomic ratios of Ti, Zr, Nb, Ta, and Mo are equal. In Example 5, steps S1 to S4 are the same as in Example 1 except for the material of the high-entropy alloy transition layer. The difference lies in step S5, which involves carbonization.

[0049] First, the blade blank after mechanical breeding in step S4 is placed in a microwave plasma chemical vapor deposition carbonization chamber. The mechanical pump is turned on to evacuate the air pressure in the carbonization chamber to a vacuum state, and then hydrogen gas is introduced at a flow rate of 400 sccm. When the air pressure in the carbonization chamber reaches 0.4 kPa, the microwave power supply is turned on with a power of 0.6 kW. Then, when the power of the microwave power supply is increased to 1.2 kW and the air pressure in the carbonization chamber reaches 2.4 kPa, methane gas with a volume concentration of 3% is introduced for carbonization treatment at a flow rate of 80 sccm. The carbonization treatment temperature is 700℃ and the carbonization treatment time is 60 min, thus obtaining a martensitic stainless steel blade with a diamond / high entropy alloy transition layer. Example 6

[0050] In this embodiment 6, the material of the blade substrate is martensitic stainless steel; the nominal composition of the high-entropy alloy transition layer is TiZrNbTaMo, and the atomic ratios of Ti, Zr, Nb, Ta and Mo are equal.

[0051] like Figure 1 The method for preparing diamond / high-entropy alloy transition layer martensitic stainless steel cutting tools, as shown, includes the following steps:

[0052] S1. Pretreatment of the blade substrate: The martensitic stainless steel blade substrate is annealed in an argon protective atmosphere at a temperature of 600℃ for 2 hours. Then it is cooled to room temperature in the furnace and taken out for use.

[0053] S2. Laser processing of the blade substrate: Take the blade substrate pretreated in step S1, grind and clean it, and then mount it on the laser processing equipment. Process a frustum array on both sides of the blade substrate. The frustum array includes several closely arranged micro frustums. The shape and size of the micro frustums are as follows: the diameter of the top surface of the micro frustum is 50μm, the diameter of the bottom surface of the micro frustum is 75μm, the height of the micro frustum is 50μm, and the spacing between the micro frustums is 75μm. A conical blind hole is set in the center of the top surface of the micro frustum. The diameter of the conical blind hole is 25μm and the depth of the conical blind hole is 25μm.

[0054] S3. Prepare a high-entropy alloy transition layer on the surface of the blade substrate, including the following steps:

[0055] S3-1. Use a 0.1 mol / L HCl solution to pickle the blade substrate after laser processing in step S2 to remove the oxides on the surface of the blade substrate after laser processing. After pickling, use an alcohol solution to ultrasonically clean the blade substrate for 10 minutes.

[0056] S3-2. Based on the height of the frustum array, a high-entropy alloy transition layer is prepared on the surface of the blade substrate using the following method:

[0057] Since the height of the circular cone array in the embodiment 6 is 50 μm, a high-entropy alloy transition layer is prepared on the surface of the blade substrate by using a double-layer glow plasma ionizing process, including the following steps:

[0058] Firstly, the blade substrate prepared in the step S3-1 is placed in the double-layer glow plasma ionizing furnace, argon gas is introduced into the double-layer glow plasma ionizing furnace as a protective gas, the flow rate of the argon gas is 70 sccm; then, the double-layer glow plasma ionizing furnace is started, the high-entropy alloy is infiltrated into the surface of the blade substrate, the metal infiltration time is 180 min, the high-entropy alloy transition layer is prepared on the surface of the blade substrate by using the double-layer glow plasma ionizing process, the high-entropy alloy transition layer is filled in the blind hole of the micro circular cone and completely covers the circular cone array; finally, the blade blank is taken out from the double-layer glow plasma ionizing furnace, and the surface of the blade blank is finely polished for standby use.

[0059] S4, mechanical breeding: the diamond powder with a particle size of 50 nm is uniformly applied on the surface of the blade blank, and then the blade is immersed in the diamond suspension for ultrasonic treatment for 10 min;

[0060] S5, carbonization treatment: firstly, the blade blank after the mechanical breeding in the step S4 is placed in the microwave plasma chemical vapor deposition carbonization chamber, a mechanical pump is opened, hydrogen gas is introduced into the carbonization chamber after the pressure in the carbonization chamber is pumped to a vacuum state, the flow rate of the hydrogen gas is 400 sccm, the microwave power is opened when the pressure in the carbonization chamber is 0.4 KPa, the power of the microwave power source is 0.6 kW; then, when the power of the microwave power source is increased to 1.2 kW and the pressure in the carbonization chamber reaches 2.4 KPa, the methane gas with a volume concentration of 3% is introduced for carbonization treatment, the flow rate of the methane is 120 sccm, the carbonization treatment temperature is 700 ℃, the carbonization treatment time is 120 min, and the diamond coating with high hardness, high wear resistance and corrosion resistance is generated on the carbide surface of the high-entropy alloy transition layer during the carbonization treatment. After the carbonization holding is completed, the power is gradually reduced to zero, the power source is turned off, and the martensitic stainless steel blade with the diamond / high-entropy alloy transition layer is prepared.

[0061] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for preparing diamond / high-entropy alloy transition layer martensitic stainless steel cutting tools, characterized in that, Includes the following steps: S1. Pretreatment of the blade substrate: The martensitic stainless steel blade substrate is annealed in an argon protective atmosphere at a temperature of 600℃ for 2 hours. Then it is cooled to room temperature in the furnace and taken out for use. S2. Laser processing of the blade substrate: Take the blade substrate pretreated in step S1, grind and clean it, and then mount it on the laser processing equipment. Process a frustum array on both sides of the blade substrate. The frustum array includes several closely arranged micro frustums. The shape and size of the micro frustums are as follows: the diameter of the upper surface of the micro frustum is 10μm-500μm, the diameter of the lower surface of the micro frustum is 1.2 to 3 times the diameter of the upper surface of the micro frustum, the height of the micro frustum is 10μm-300μm, and the spacing between the micro frustums is equal to the diameter of the lower surface of the micro frustum. A conical blind hole is set in the center of the upper surface of the micro frustum. The diameter of the conical blind hole is 5μm-100μm, and the depth of the conical blind hole is 5μm-200μm. S3. Prepare a high-entropy alloy transition layer on the surface of the blade substrate, including the following steps: S3-1. Use a 0.1 mol / L HCl solution to pickle the blade substrate after laser processing in step S2 to remove the oxides on the surface of the blade substrate after laser processing. After pickling, use an alcohol solution to ultrasonically clean the blade substrate for 10 minutes. S3-2. Based on the height of the frustum array, a high-entropy alloy transition layer is prepared on the surface of the blade substrate using the following method: 1) When 10μm ≤ height of the frustum array < 50μm, a high-entropy alloy transition layer is prepared on the surface of the blade substrate using magnetron sputtering, including the following steps: First, the blade substrate prepared in step S3-1 is placed as the substrate in the magnetron sputtering chamber, and the high-entropy alloy is placed as the target material in the magnetron sputtering chamber. The vacuum pump is started to evacuate the chamber until the pressure is 1.5 × 10⁻⁶. -3 Pa; then, argon gas was introduced into the magnetron sputtering chamber as a protective gas at a flow rate of 70 sccm. When the pressure in the magnetron sputtering chamber reached 0.5 Pa, the magnetron sputtering power supply was turned on to perform magnetron sputtering on one side of the blade substrate. The power of the magnetron sputtering power supply was 150 W, and the magnetron sputtering time was 180 min–360 min. A bias voltage of -150 V was applied during the magnetron sputtering process to prepare a high-entropy alloy transition layer on one side of the blade substrate. The high-entropy alloy transition layer filled the conical blind hole of the micro frustum and completely covered the frustum array. Finally, after the magnetron sputtering treatment was completed, the magnetron sputtering power supply was turned off, and the blade blank was removed for later use. 2) When 50μm ≤ height of the frustum array ≤ 300μm, a high-entropy alloy transition layer is prepared on the surface of the blade substrate using a double-layer glow discharge ion infiltration process, including the following steps: First, the blade substrate prepared in step S3-1 is placed in a double-layer glow discharge metallization furnace, and argon gas is introduced into the furnace as a protective gas at a flow rate of 70 sccm. Then, the double-layer glow discharge metallization furnace is started to diffuse a high-entropy alloy onto the surface of the blade substrate for 180-360 minutes, thus completing the preparation of a high-entropy alloy transition layer on the surface of the blade substrate by double-layer glow discharge ion metallization. The high-entropy alloy transition layer fills the conical blind holes of the micro-frustum and completely covers the frustum array. Finally, the blade blank is removed from the double-layer glow discharge metallization furnace, and the surface of the blade blank is finely polished for later use. S4. Mechanical breeding: Diamond powder with a particle size of 50nm-100nm is uniformly coated on the surface of the blade blank, and then the blade is immersed in diamond suspension and ultrasonically treated for 10 min. S5. Carbonization Treatment: First, the blade blank after mechanical breeding in step S4 is placed in a microwave plasma chemical vapor deposition carbonization chamber. The mechanical pump is turned on to evacuate the air pressure in the carbonization chamber to a vacuum state, and then hydrogen gas is introduced at a flow rate of 400 sccm. When the air pressure in the carbonization chamber reaches 0.4 kPa, the microwave power supply is turned on with a power of 0.6 kW. Then, when the power of the microwave power supply is increased to 1kW-2.5kW and the air pressure in the carbonization chamber reaches 2kPa-5kPa, methane gas with a volume concentration of 1%-3% is introduced for carbonization treatment at a flow rate of 40 sccm-120 sccm. The carbonization treatment temperature is 600℃-700℃, and the carbonization treatment time is 60min-180min, thus obtaining a martensitic stainless steel blade with a diamond / high-entropy alloy transition layer.

2. The method for preparing diamond / high-entropy alloy transition layer martensitic stainless steel cutting tools according to claim 1, characterized in that: In step S3-2, the high-entropy alloy is Mo. 0.5 (TiZrTaW) 0.5 Or ZrNbTaMo.

Images