Composite diamond material and method for producing the same, and diamond-modified wire saw

Abstract

The application provides a composite diamond material and a preparation method thereof and a diamond modified wire saw, and belongs to the technical field of materials. Melamine-formaldehyde resin microspheres are prepared, the surface of the melamine-formaldehyde resin microspheres is loaded with tungsten oxide and complexed with nickel oxide, tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres are prepared, the tungsten nickel alloy@carbon nanotube Janus nanosheet is prepared through heating calcination, and the composite diamond material is prepared by mixing the tungsten nickel alloy@carbon nanotube Janus nanosheet with activated diamond micro powder treated by plasma and ball milling. The composite diamond material prepared by the application can obviously improve the adhesion with the steel material of the wire saw, thereby improving the hardness, strength, wear resistance, heat conduction and heat resistance, antistatic performance and the like of the wire saw, and obviously widening the application range of the wire saw.

Description

Technical Field

[0001] This invention relates to the field of materials technology, specifically to a composite diamond material and its preparation method, and a diamond-modified wire saw. Background Technology

[0002] In cutting hard and brittle materials such as silicon, gemstones, and ceramics, the main cutting tools used are free abrasive wire saws and bonded abrasive wire saws. Bonded abrasive wire saws are manufactured using resin-bonded curing technology and electroplating technology. Resin-bonded diamond wire saws have poor wear resistance and heat resistance, and low abrasive holding power. The disadvantages of electroplated diamond wire saw cutting technology are: poor mechanical properties and numerous defects, leading to breakage during cutting; low diamond holding power of the coating, resulting in chips adhering to the diamond surface with increasing processing cycles, and a gradual decline in cutting performance due to wear and shedding of the diamond abrasive grains; high cost and low manufacturing efficiency.

[0003] Currently, to extend the service life of diamond wire saws, the primary focus is on improving the mechanical properties of the saws and the diamond-holding power of the coating. Additionally, wire saws generate significant heat during operation, placing higher demands on their heat resistance and heat dissipation. Summary of the Invention

[0004] The purpose of this invention is to propose a composite diamond material and its preparation method, and a diamond-modified wire saw, which can significantly improve the adhesion to the wire saw steel, thereby improving the hardness, strength, wear resistance, thermal conductivity, heat resistance, and antistatic properties of the wire saw, thus significantly broadening the application range of the wire saw.

[0005] The technical solution of this invention is implemented as follows:

[0006] This invention provides a method for preparing a composite diamond material. Melamine-formaldehyde resin microspheres are prepared, and tungsten oxide is loaded onto the surface and nickel oxide is complexed to obtain tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres. After heating and calcining, tungsten-nickel alloy@carbon nanotube Janus nanosheets are obtained. These nanosheets are then mixed with activated diamond micropowder that has undergone plasma treatment and ball-milled to obtain the composite diamond material.

[0007] As a further improvement to the present invention, the following steps are included:

[0008] S1. Melamine, formaldehyde, water, polyvinyl alcohol and oxalic acid are mixed evenly, heated and stirred to react, centrifuged, washed and dried to obtain melamine-formaldehyde resin microspheres;

[0009] S2. Dissolve sodium tungstate in water, add melamine-formaldehyde resin microspheres and ammonium chloride, add concentrated hydrochloric acid dropwise, stir, filter, centrifuge, and dry to obtain tungsten oxide@melamine-formaldehyde resin microspheres;

[0010] S3. Add tungsten oxide / melamine-formaldehyde resin microspheres to a solution containing nickel salt, disperse evenly, add a complexing agent, heat to evaporate the solvent to obtain a sol; then raise the temperature and lower the vacuum to obtain a dry gel, ball mill to obtain tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres;

[0011] S4. Tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres were heated and calcined under inert gas protection, and then ball-milled to obtain tungsten-nickel alloy@carbon nanotube Janus nanosheets;

[0012] S5. Add diamond micro powder to acetone for soaking, filter, dry, and then treat with plasma to obtain activated diamond micro powder;

[0013] S6. Activated diamond micro powder and tungsten-nickel alloy@carbon nanotube Janus nanosheets are mixed evenly and ball-milled to obtain composite diamond material.

[0014] As a further improvement of the present invention, the mass ratio of melamine, formaldehyde, water, polyvinyl alcohol and oxalic acid in step S1 is 1.5-2.5:1.5-2.5:95-105:0.4-0.6:0.15-0.25, and the heating and stirring reaction is carried out at a temperature of 75-85°C for 5-15 minutes.

[0015] As a further improvement of the present invention, the mass ratio of sodium tungstate, melamine-formaldehyde resin microspheres, ammonium chloride and concentrated hydrochloric acid in step S2 is 2-4:4-6:0.5-1:1-2.

[0016] As a further improvement of the present invention, in step S3, the mass ratio of tungsten oxide / melamine-formaldehyde resin microspheres, nickel salt, and complexing agent is 10:2-4:3-5, the nickel salt is selected from at least one of nickel chloride, nickel sulfate, and nickel nitrate, the complexing agent is citric acid or sodium citrate, the heating temperature is 50-70°C, the temperature is increased to 120-150°C, and the vacuum degree is reduced to 0.01-0.1 MPa; the ball milling time is 1-2 hours.

[0017] As a further improvement of the present invention, the heating and calcination temperature in step S4 is 850-950℃, the time is 60-90min, and the ball milling time is 3-5h.

[0018] As a further improvement of the present invention, the plasma treatment conditions in step S5 are as follows: hydrogen flow rate of 40-60 sccm, oxygen flow rate of 40-60 sccm, substrate temperature of 350-450℃, gas pressure of 3-4 kPa, power of 600-700 W, and time of 15-25 min.

[0019] As a further improvement of the present invention, the mass ratio of activated diamond micropowder and tungsten-nickel alloy@carbon nanotube Janus nanosheets in step S6 is 10:4-7, and the ball milling time is 3-5 hours.

[0020] This invention further protects a composite diamond material prepared by the above-described preparation method.

[0021] This invention further protects a diamond-modified wire saw, which is made by adding the above-mentioned composite diamond material into a coating, coating it onto the wire saw, and curing it to obtain the diamond-modified wire saw.

[0022] The present invention has the following beneficial effects:

[0023] This invention prepares melamine-formaldehyde resin microspheres with sodium tungstate adsorbed on the surface. Tungsten oxide is generated by the dropwise addition of concentrated hydrochloric acid. Then, nickel ions are complexed to form a nickel complex on the surface. Heating yields a dry gel, producing tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres. Calcination of the melamine-formaldehyde resin microspheres allows the CO and NH3 generated from the pyrolysis of the core melamine-formaldehyde resin microspheres to act as reducing gases, reducing the tungsten oxide and nickel oxide to a tungsten-nickel alloy. The resulting alloy exhibits excellent stability and compatibility, effectively disrupting the balance of capillary forces and adhesive forces during particle rearrangement, promoting liquid-phase filling, and improving the performance of the tungsten-copper alloy. Furthermore, it can serve as a metal catalyst, using CO as a carbon source. Surface-autocatalytic in-situ growth of carbon nanotubes eliminates the need for hazardous carbon sources and reducing gases, making it more convenient and operable. The resulting tungsten-nickel alloy@carbon nanotube hollow spheres are then ball-milled to produce Janus nanosheets. One side of these nanosheets is a carbon nanotube layer, exhibiting good compatibility with diamond. Simultaneously, the network structure provides excellent thermal conductivity, heat dissipation, and electrical conductivity, significantly improving heat dissipation during wire saw operation and reducing static electricity. The other side is a tungsten-nickel alloy layer, possessing good strength and hardness, enhancing the wear resistance and strength of diamond-modified wire saws. Furthermore, due to its cubic crystal structure, similar to wire saw steel, its compatibility and affinity are greatly improved, allowing for better mixing.

[0024] The diamond micropowder treated with plasma utilizes high-energy particles in the plasma to bombard the diamond surface, causing the surface atoms to rearrange or form active groups, thereby enhancing the interaction between the two. This allows the resulting tungsten-nickel alloy@carbon nanotube Janus nanosheets to be stably fixed on the diamond powder surface. After the coating is added, the adhesion to the wire saw steel is significantly improved, thereby improving the hardness, strength, wear resistance, thermal conductivity, heat resistance, and antistatic properties of the wire saw, thus significantly broadening the application range of the wire saw. Detailed Implementation

[0025] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] Example 1

[0027] This embodiment provides a method for preparing a composite diamond material, including the following steps:

[0028] S1. Mix 1.5g melamine, 1.5g formaldehyde, 95mL water, 0.4g polyvinyl alcohol and 0.15g oxalic acid evenly, heat to 75℃, stir and react for 5min, centrifuge, wash and dry to obtain melamine-formaldehyde resin microspheres.

[0029] S2. Dissolve 2g of sodium tungstate in 200mL of water, add 4g of melamine-formaldehyde resin microspheres and 0.5g of ammonium chloride, add 1g of concentrated hydrochloric acid dropwise, stir and mix evenly, filter, centrifuge, and dry to obtain tungsten oxide@melamine-formaldehyde resin microspheres;

[0030] S3. Add 10g of tungsten oxide / melamine-formaldehyde resin microspheres to 150mL of a solution containing 2g of nickel chloride, disperse evenly, add 3g of sodium citrate, heat to 50℃, evaporate the solvent to obtain a sol; then raise the temperature to 120℃, lower the vacuum to 0.01MPa to obtain a dry gel, ball mill for 1h to obtain tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres;

[0031] S4. Tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres were heated to 850℃ under argon protection, calcined for 60 min, and ball-milled for 3 h to obtain tungsten-nickel alloy@carbon nanotube Janus nanosheets.

[0032] S5. Add diamond micro powder to acetone for soaking, filter, dry, and then treat with plasma to obtain activated diamond micro powder;

[0033] The plasma treatment conditions were: hydrogen flow rate of 40 sccm, oxygen flow rate of 60 sccm, substrate temperature of 350℃, gas pressure of 3 kPa, power of 600 W, and time of 15 min.

[0034] S6. Mix 10g of activated diamond micro powder and 4g of tungsten-nickel alloy@carbon nanotube Janus nanosheets evenly, and ball mill for 3h to obtain composite diamond material.

[0035] Example 2

[0036] This embodiment provides a method for preparing a composite diamond material, including the following steps:

[0037] S1. Mix 2.5g melamine, 2.5g formaldehyde, 105mL water, 0.6g polyvinyl alcohol and 0.25g oxalic acid evenly, heat to 85℃, stir and react for 15min, centrifuge, wash and dry to obtain melamine-formaldehyde resin microspheres.

[0038] S2. Dissolve 4g sodium tungstate in 200mL of water, add 6g melamine-formaldehyde resin microspheres and 1g ammonium chloride, add 2g concentrated hydrochloric acid dropwise, stir and mix evenly, filter, centrifuge, and dry to obtain tungsten oxide@melamine-formaldehyde resin microspheres.

[0039] S3. Add 10g of tungsten oxide / melamine-formaldehyde resin microspheres to 150mL of a solution containing 4g of nickel nitrate, disperse evenly, add 5g of citric acid, heat to 70℃, evaporate the solvent to obtain a sol; then raise the temperature to 150℃, lower the vacuum to 0.1MPa to obtain a dry gel, ball mill for 2h to obtain tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres;

[0040] S4. Tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres were heated to 950℃ under argon protection, calcined for 90 min, and ball-milled for 5 h to obtain tungsten-nickel alloy@carbon nanotube Janus nanosheets.

[0041] S5. Add diamond micro powder to acetone for soaking, filter, dry, and then treat with plasma to obtain activated diamond micro powder;

[0042] The plasma treatment conditions were: hydrogen flow rate of 60 sccm, oxygen flow rate of 40 sccm, substrate temperature of 450℃, gas pressure of 4 kPa, power of 700 W, and time of 25 min.

[0043] S6. Mix 10g of activated diamond micro powder and 7g of tungsten-nickel alloy@carbon nanotube Janus nanosheets evenly, and ball mill for 5h to obtain composite diamond material.

[0044] Example 3

[0045] This embodiment provides a method for preparing a composite diamond material, including the following steps:

[0046] S1. Mix 2g melamine, 2g formaldehyde, 100mL water, 0.5g polyvinyl alcohol and 0.2g oxalic acid evenly, heat to 80℃, stir and react for 10min, centrifuge, wash and dry to obtain melamine-formaldehyde resin microspheres.

[0047] S2. Dissolve 3g sodium tungstate in 200mL of water, add 5g melamine-formaldehyde resin microspheres and 0.7g ammonium chloride, add 1.5g concentrated hydrochloric acid dropwise, stir and mix evenly, filter, centrifuge, and dry to obtain tungsten oxide@melamine-formaldehyde resin microspheres;

[0048] S3. Add 10g of tungsten oxide / melamine-formaldehyde resin microspheres to 150mL of solution containing 3g of nickel nitrate, disperse evenly, add 4g of citric acid, heat to 60℃, evaporate the solvent to obtain a sol; then raise the temperature to 135℃, lower the vacuum to 0.05MPa to obtain a dry gel, ball mill for 1.5h to obtain tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres;

[0049] S4. Tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres were heated to 900℃ under argon protection, calcined for 75 min, and ball-milled for 4 h to obtain tungsten-nickel alloy@carbon nanotube Janus nanosheets.

[0050] S5. Add diamond micro powder to acetone for soaking, filter, dry, and then treat with plasma to obtain activated diamond micro powder;

[0051] The plasma treatment conditions were: hydrogen flow rate of 50 sccm, oxygen flow rate of 50 sccm, substrate temperature of 400℃, gas pressure of 3.5 kPa, power of 650 W, and time of 20 min.

[0052] S6. Mix 10g of activated diamond micro powder and 5.5g of tungsten-nickel alloy@carbon nanotube Janus nanosheets evenly, and ball mill for 4h to obtain composite diamond material.

[0053] Comparative Example 1

[0054] The difference from Example 3 is that step S2 was not performed.

[0055] Specifically as follows:

[0056] S1. Mix 2g melamine, 2g formaldehyde, 100mL water, 0.5g polyvinyl alcohol and 0.2g oxalic acid evenly, heat to 80℃, stir and react for 10min, centrifuge, wash and dry to obtain melamine-formaldehyde resin microspheres.

[0057] S2. Add 10g of melamine-formaldehyde resin microspheres to 150mL of a solution containing 3g of nickel nitrate, disperse evenly, add 4g of citric acid, heat to 60℃, evaporate the solvent to obtain a sol; then raise the temperature to 135℃, lower the vacuum to 0.05MPa to obtain a dry gel, ball mill for 1.5h to obtain nickel oxide@melamine-formaldehyde resin microspheres;

[0058] S3. Nickel oxide@melamine-formaldehyde resin microspheres were heated to 900℃ under argon protection, calcined for 75 min, and ball-milled for 4 h to obtain nickel@carbon nanotube Janus nanosheets.

[0059] S4. Add diamond micro powder to acetone for soaking, filter, dry, and then treat with plasma to obtain activated diamond micro powder;

[0060] The plasma treatment conditions were: hydrogen flow rate of 50 sccm, oxygen flow rate of 50 sccm, substrate temperature of 400℃, gas pressure of 3.5 kPa, power of 650 W, and time of 20 min.

[0061] S5. Mix 10g of activated diamond micro powder and 5.5g of nickel@carbon nanotube Janus nanosheets evenly, and ball mill for 4h to obtain composite diamond material.

[0062] Comparative Example 2

[0063] The difference from Example 3 is that step S3 was not performed.

[0064] Specifically as follows:

[0065] S1. Mix 2g melamine, 2g formaldehyde, 100mL water, 0.5g polyvinyl alcohol and 0.2g oxalic acid evenly, heat to 80℃, stir and react for 10min, centrifuge, wash and dry to obtain melamine-formaldehyde resin microspheres.

[0066] S2. Dissolve 3g sodium tungstate in 200mL of water, add 5g melamine-formaldehyde resin microspheres and 0.7g ammonium chloride, add 1.5g concentrated hydrochloric acid dropwise, stir and mix evenly, filter, centrifuge, and dry to obtain tungsten oxide@melamine-formaldehyde resin microspheres;

[0067] S3. Tungsten oxide@melamine-formaldehyde resin microspheres were heated to 900℃ under argon protection, calcined for 75 min, and ball-milled for 4 h to obtain tungsten@carbon nanotube Janus nanosheets.

[0068] S4. Add diamond micro powder to acetone for soaking, filter, dry, and then treat with plasma to obtain activated diamond micro powder;

[0069] The plasma treatment conditions were: hydrogen flow rate of 50 sccm, oxygen flow rate of 50 sccm, substrate temperature of 400℃, gas pressure of 3.5 kPa, power of 650 W, and time of 20 min.

[0070] S5. Mix 10g of activated diamond micro powder and 5.5g of tungsten@carbon nanotube Janus nanosheets evenly, and ball mill for 4h to obtain composite diamond material.

[0071] Comparative Example 3

[0072] The difference from Example 3 is that step S5 was not performed.

[0073] Specifically as follows:

[0074] S1. Mix 2g melamine, 2g formaldehyde, 100mL water, 0.5g polyvinyl alcohol and 0.2g oxalic acid evenly, heat to 80℃, stir and react for 10min, centrifuge, wash and dry to obtain melamine-formaldehyde resin microspheres.

[0075] S2. Dissolve 3g sodium tungstate in 200mL of water, add 5g melamine-formaldehyde resin microspheres and 0.7g ammonium chloride, add 1.5g concentrated hydrochloric acid dropwise, stir and mix evenly, filter, centrifuge, and dry to obtain tungsten oxide@melamine-formaldehyde resin microspheres;

[0076] S3. Add 10g of tungsten oxide / melamine-formaldehyde resin microspheres to 150mL of solution containing 3g of nickel nitrate, disperse evenly, add 4g of citric acid, heat to 60℃, evaporate the solvent to obtain a sol; then raise the temperature to 135℃, lower the vacuum to 0.05MPa to obtain a dry gel, ball mill for 1.5h to obtain tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres;

[0077] S4. Tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres were heated to 900℃ under argon protection, calcined for 75 min, and ball-milled for 4 h to obtain tungsten-nickel alloy@carbon nanotube Janus nanosheets.

[0078] S5. Mix 10g of diamond micro powder and 5.5g of tungsten-nickel alloy@carbon nanotube Janus nanosheets evenly, and ball mill for 4h to obtain composite diamond material.

[0079] Comparative Example 4

[0080] The difference from Example 3 is that the tungsten-nickel alloy@carbon nanotube Janus nanosheets are replaced with an equal mass of carbon nanotube powder.

[0081] Comparative Example 5

[0082] The difference from Example 3 is that the tungsten-nickel alloy@carbon nanotube Janus nanosheets are replaced by an equal mass of tungsten-nickel alloy powder.

[0083] Preparation method of tungsten-nickel alloy:

[0084] Dissolve 3g of sodium tungstate in 200mL of water, add 0.7g of ammonium chloride, add 1.5g of concentrated hydrochloric acid dropwise, stir and mix well, filter, centrifuge, and dry to obtain tungsten oxide powder;

[0085] S3. Add 10g of tungsten oxide powder to 150mL of a solution containing 3g of nickel nitrate, disperse evenly, add 4g of citric acid, heat to 60℃, evaporate the solvent to obtain a sol; then raise the temperature to 135℃, lower the vacuum to 0.05MPa to obtain a dry gel, ignite the dry gel, and calcine and reduce it at 900℃ under a hydrogen atmosphere for 5h to obtain tungsten-nickel alloy powder.

[0086] Test Example 1

[0087] The composite diamond materials prepared in Examples 1-3 and Comparative Examples 1-5 were granulated with 5 wt% polyvinyl alcohol and then pressed at 100 MPa. The resulting preforms were first heated to 700°C at a rate of 5°C / min for 1 hour to remove the binder, then heated to 1500°C at a rate of 3°C / min for 3 hours to sinter, and finally cooled to 250°C at a controlled rate of 4°C / min before furnace cooling to room temperature. Performance tests were performed, and the results are shown in Table 1.

[0088] Bending strength was tested using the three-point bending method on an Xww universal testing machine.

[0089] The hardness was tested using an MC010 hardness tester, and the average value of the five test points was taken as the final hardness value.

[0090] The indentation method was selected to test the fracture toughness of the specimen.

[0091] Thermal conductivity was tested using a laser thermal conductivity meter (DFX-500) (25℃).

[0092] Table 1

[0093]

[0094] As can be seen from the table above, the samples made from the composite diamond materials prepared in Examples 1-3 of this invention have good mechanical properties, hardness and thermal conductivity.

[0095] Test Example 2

[0096] The composite diamond materials obtained in Examples 1-3 and Comparative Examples 1-5 were added to the coating base to prepare the coating. The coating was stirred and mixed evenly and then uniformly coated onto the core wire. The coated core wire was then limited in diameter using a 145μm diameter limiting mold. The coated core wire was then baked in a 100℃ thermal field for 60s. The baked core wire was then cured in a light curing oven and collected to obtain a diamond-modified wire saw. Its performance was then tested.

[0097] The coating formulation is as follows: 40wt% epoxy acrylate, 30wt% polyether acrylate, 10wt% polyester acrylate, 10wt% composite diamond material, 2wt% silicon dioxide, 2wt% silicon nitride, 5wt% ethyl acetate, and 1wt% boron nitride.

[0098] Method for testing cutting efficiency: The prepared diamond-modified wire saw was used to cut a silicon rod with a diameter of 100 mm for 250 minutes at a linear speed of 2.5 m / s, a feed rate of 0.5 mm / min, and water as the cooling medium. The cutting efficiency of the diamond-modified wire saw on the silicon rod and the bonding strength between the abrasive grains and the core wire were examined.

[0099] The flexibility test method is as follows: the prepared diamond-modified wire saw is wound around a cylinder with a diameter of 10 mm, and then the coating surface of the diamond wire saw is examined under a microscope to see if it is cracked or peeled off.

[0100] The wear resistance test method is as follows: use GCr steel sheet (HRC=54) to perform a scraping test on the surface of the prepared diamond wire saw and observe whether there is any powder falling off.

[0101] The results are shown in Table 2.

[0102] Table 2

[0103]

[0104] As can be seen from the table above, the diamond-modified wire saws made by coating the composite diamond materials prepared in Examples 1-3 of this invention with coatings have good comprehensive performance.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of producing a composite diamond material, characterized by, Comprising the following steps: S1. Melamine, formaldehyde, water, polyvinyl alcohol, oxalic acid are mixed uniformly, heated and stirred to react, centrifuged, washed, dried, and melamine-formaldehyde resin microspheres are prepared; S2. Sodium tungstate is dissolved in water, melamine-formaldehyde resin microspheres and ammonium chloride are added, concentrated hydrochloric acid is added dropwise, stirred, filtered, centrifuged, and dried to obtain tungsten oxide@melamine-formaldehyde resin microspheres; S3. Tungsten oxide / melamine-formaldehyde resin microspheres are added to a solution containing a nickel salt, uniformly dispersed, a complexing agent is added, the solvent is evaporated by heating, a sol is obtained, then the temperature is increased and the vacuum degree is reduced to obtain a xerogel, ball milling is performed, and tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres are prepared; S4. Tungsten oxide / nickel oxide@melamine-formaldehyde resin microspheres are calcined under inert gas protection, ball milling is performed, and tungsten-nickel alloy@carbon nanotube Janus nanosheet is prepared; S5. Diamond micro-powder is soaked in acetone, filtered, dried, and activated by plasma treatment to obtain activated diamond micro-powder; S6. The activated diamond micro-powder and tungsten-nickel alloy@carbon nanotube Janus nanosheet are uniformly mixed and ball-milled to obtain a composite diamond material.

2. The production method according to claim 1, characterized by, In step S1, the mass ratio of melamine, formaldehyde, water, polyvinyl alcohol, and oxalic acid is 1.5-2.5:1.5-2.5:95-105:0.4-0.6:0.15-0.25, and the temperature of the heated and stirred reaction is 75-85°C, and the time is 5-15 min.

3. The preparation method according to claim 1, characterized in that, In step S2, the mass ratio of sodium tungstate, melamine-formaldehyde resin microspheres, ammonium chloride, and concentrated hydrochloric acid is 2-4:4-6:0.5-1:1-2.

4. The production method according to claim 1, characterized by, In step S3, the mass ratio of tungsten oxide / melamine-formaldehyde resin microspheres, nickel salt, and complexing agent is 10:2-4:3-5, the nickel salt is at least one selected from nickel chloride, nickel sulfate, and nickel nitrate, the complexing agent is citric acid or sodium citrate, the heating temperature is 50-70°C, the temperature is increased to 120-150°C, and the vacuum degree is reduced to 0.01-0.1 MPa; the ball milling time is 1-2 h.

5. The method of claim 1, wherein, In step S4, the calcination temperature is 850-950°C, and the time is 60-90 min, and the ball milling time is 3-5 h.

6. The method of claim 1, wherein, In step S5, the plasma treatment conditions are as follows: hydrogen flow rate is 40-60 sccm, oxygen flow rate is 40-60 sccm, substrate temperature is 350-450°C, gas pressure is 3-4 kPa, power is 600-700 W, and time is 15-25 min.

7. The preparation method according to claim 1, characterized in that, In step S6, the mass ratio of activated diamond micro-powder and tungsten-nickel alloy@carbon nanotube Janus nanosheet is 10:4-7, and the ball milling time is 3-5 h.

8. A composite diamond material prepared by the preparation method of any one of claims 1-7.

9. A diamond modified wire saw, characterized by, The composite diamond material of claim 8 is added to paint, coated on a wire saw, and cured to obtain a diamond-modified wire saw.

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