A super wear-resistant diamond composite material and a preparation method thereof

Abstract

The present invention discloses a super wear-resistant diamond composite material and a preparation method thereof. The preparation method includes sintering a mixture of Fe powder, Co powder, Ni powder, Cu powder, W powder, and Sn powder to obtain a multi-element alloy Fe 15～30 Co 10～15 Ni 10～15 Cu 30～50 W 2～5 Sn 5～10 ; sintering a mixture of the multi-element alloy, diamond, modified porous carbon, and binder in a mass ratio of 90-100:3-5:0.5-1:0.5-2 to obtain a super wear-resistant diamond composite material. The present invention optimizes the proportion of each component in the multi-element alloy, improves the sintering performance and the holding force of the matrix on the diamond by introducing Sn with a low melting point, the modified porous carbon is well dispersed in the multi-element alloy, improving the overall strength, significantly enhancing the grinding performance and service life of the composite material, and at the same time increasing the thermal conductivity.

Description

Technical Field

[0001] The present invention relates to the technical field of diamond composite materials, and particularly relates to a super wear-resistant diamond composite material and a preparation method thereof. Background Art

[0002] As the hardest substance naturally existing in nature, diamond also has the advantages of good wear resistance, high thermal conductivity, good electrical insulation, and strong corrosion resistance, and is widely used in cutting, grinding, drilling, and the electronics industry. Diamond composite superhard abrasives, such as grinding heads and grinding discs, are playing an increasingly important role in the fields of high-end chip processing, ceramics, etc. With the increasing requirements for the processing accuracy, processing efficiency, and service life of abrasives, it is becoming more and more difficult for the quality of existing diamond abrasives to meet the increasing demands.

[0003] Metal-bonded diamond materials are the most widely used, the most extensively applied, and the largest in usage at present. They have the characteristics of high matrix strength, hardness, and wear resistance, but they also have the disadvantages of poor self-sharpening and mismatched wear between the matrix and the diamond. There are some methods to coat the metal binder and the diamond body to improve the overall performance. For example, CN118241075A discloses a wear-resistant multi-alloy - diamond composite material and a preparation method thereof. After plating a metallized layer on the surface of the diamond, it is mixed with the multi-alloy Cu 35 Ni 20 Cr 15 Fe 20 Co5W3Ti2 and then sintered in two stages and then placed in a boron trichloride atmosphere for continued sintering. The presence of the metallized layer reduces the thermal damage and graphitization of the diamond, and wear-resistant metal borides are formed during calcination in boron trichloride, thus improving the strength and wear resistance of the diamond composite material. CN114921677A discloses a high-entropy alloy - diamond superhard composite material with high self-sharpening and strong heat dissipation, a preparation method thereof, and applications. Inorganic particles, high-entropy alloy powder, and diamond abrasive grains are added to an organic binder to prepare a semi-solid green material; the semi-solid green material is extruded into a mold or formed by a roll pressing and cutting process to obtain a composite material green body; the composite material green body is placed in a sintering device for sintering to prepare a high-entropy alloy - diamond superhard composite material with internal pores.

[0004] Currently, the improvement methods of metal-bonded diamond materials mainly improve the overall performance by increasing the strength of the metal binder. However, such a method may lead to mismatched wear between the matrix and the diamond, which not only affects the grinding efficiency but may also reduce the service life. It is necessary to provide a metal - diamond composite material with good matching. Summary of the Invention

[0005] In order to solve the problems existing in the prior art, the present invention provides a super wear-resistant diamond composite material, which is obtained by sintering a multi-element alloy, diamond, modified porous carbon, and binder in a mass ratio of 90-100:3-5:0.5-1:0.5-2;

[0006] Among them, the multi-element alloy is Fe 15～30 Co 10～15 Ni 10～15 Cu 30～50 W 2～5 Sn 5～10 .

[0007] In the multi-element alloy composition of the present invention, Fe, Co, Ni, and Cu are the main components, supplemented by W and Sn. Among them, Fe has good wettability with carbide-forming elements, good wettability with diamond, good sintering performance, can react with the diamond surface to generate Fe3C, and increase the holding force on the diamond. Co also has good sinterability at a lower temperature, and the matrix structure after sintering presents a fine grid pattern, is not prone to caking, and the self-sharpening of the matrix is better. Ni does not produce carbides on the diamond surface, but can spread on the diamond surface, has a large adhesion work, and can increase the holding force on the diamond. The adhesion work of Ni is larger than that of Co and smaller than that of Fe. The main role of Ni is to react with Cu to increase the strength of the matrix and react with low-melting-point substances to reduce the loss of low-melting-point substances. Cu has good compatibility with most metal elements and good sintering performance. Although Cu has poor wettability with diamond, a large wetting angle, and a low holding ability for diamond, adding other elements to form an alloy with Cu can improve the wetting of Cu with diamond and reduce the wetting angle, increasing the holding force. W is a carbide-forming element and can be used as a skeleton material. W has good compatibility with other bonding metals and good wetting with metals such as Cu, Co, Ni, and Fe. Sn has a low melting point, can improve the holding force of the matrix on the diamond, reduce the wetting angle between the matrix and the diamond, and tin can form solid solutions with many elements, can reduce the melting point of the alloy, and improve the pressing formability.

[0008] There have been relevant reports on the use of graphene and carbon nanotubes in diamond composite materials. Porous carbon also belongs to carbon materials and has the advantages of good thermal conductivity, high stability, good mechanical properties, and high specific surface area. At the same time, the preparation method is simpler. The preparation of carbon materials using organic acid metal salts, such as citrate metal salts, gluconate metal salts, gallate metal salts, amino acid metal salts, etc., has also been reported. Organic acid metal salts can be used as self-templates and carbon sources. Under a protective gas, they are calcined at high temperature. The organic components are carbonized, and the inorganic components are decomposed in-situ and etch the carbonized products. After removing the inorganic impurities, porous carbon with rich pores can be prepared.

[0009] To further improve the surface properties of the porous carbon prepared from organic acid metal salts, the porous carbon is intercalated with fatty amines to expand its interlayer spacing. Subsequently, a layer of polydopamine is modified on the surface of the porous carbon by the self-polymerization of dopamine to further enhance the interaction between the porous carbon and the multi-component alloy during sintering.

[0010] Further, the preparation method of the modified porous carbon includes:

[0011] Calcine the organic acid metal salt in a protective atmosphere to obtain porous carbon;

[0012] Mix the porous carbon, fatty amine, and ethanol aqueous solution and then perform ultrasonic treatment to obtain intercalated porous carbon;

[0013] Mix the intercalated porous carbon, dopamine hydrochloride, and ethanol aqueous solution, adjust the pH, and then stir and react to obtain modified porous carbon.

[0014] In the present invention, the type of the organic acid metal salt does not need to be strictly limited. Exemplarily, it can be at least one of zinc citrate, sodium gluconate, potassium tartrate, sodium L-aspartate, etc.

[0015] Further, the mass ratio of the porous carbon, fatty amine, and ethanol aqueous solution is 2-5:1-3:20-30;

[0016] The ultrasonic treatment is carried out at a power of 100-200 W and a frequency of 20-50 kHz for 3-8 h;

[0017] The mass ratio of the intercalated porous carbon, dopamine hydrochloride, and ethanol aqueous solution is 2-5:1-3:60-80;

[0018] Adjust the pH to 8.5-9.5.

[0019] The concentration of the ethanol aqueous solution used in the present invention does not need to be strictly limited. Exemplarily, it can be 20 wt%-80 wt%. The type of the soluble molybdenum salt does not need to be strictly limited. Exemplarily, it can be at least one of ammonium molybdate, sodium molybdate, etc.

[0020] Although after intercalation and polydopamine modification, the dispersion performance of the modified porous carbon in the dispersed multi-component alloy is enhanced, and at the same time, the grinding performance of the diamond composite material is improved to some extent. The modified porous carbon mainly adheres to the surface of the diamond, reducing the improvement of the expansion coefficient and thermal conductivity of the porous carbon for the composite material. Due to a large amount of heat generated by friction and grinding, especially in the absence of the action of a coolant, the heat dissipation and expansion coefficient of the binder are particularly important. Abrasives with high thermal conductivity can quickly conduct the heat generated by friction and grinding. To improve the performance of the porous carbon, a certain amount of molybdenum is chelated on the surface of the polydopamine to promote the dispersion of the modified porous carbon during sintering and further improve the comprehensive performance of the composite material.

[0021] Further, after stirring the intercalated porous carbon, dopamine hydrochloride and the aqueous ethanol solution, a soluble molybdenum salt with a mass 0.2 to 0.5 times that of the intercalated porous carbon is added.

[0022] Further, the fatty amine has 4 to 20 carbon atoms.

[0023] Further, the particle size of the multi-element alloy is 50 to 200 μm

[0024] Further, the particle size of the diamond is 100 to 300 μm.

[0025] Further, the binder includes at least one of paraffin, polyvinyl alcohol, and stearic acid.

[0026] The present invention also provides a method for preparing a super wear-resistant diamond composite material, including,

[0027] Mixing Fe powder, Co powder, Ni powder, Cu powder, W powder, and Sn powder and then sintering to obtain a multi-element alloy Fe 15～30 Co 10～15 Ni 10～ 15 Cu 30～50 W 2～5 Sn 5～10 ;

[0028] Mixing the multi-element alloy, diamond, modified porous carbon, and binder in a mass ratio of 90 to 100:3 to 5:0.5 to 1:0.5 to 2 and then sintering to obtain a super wear-resistant diamond composite material.

[0029] Further, the sintering is carried out by spark plasma sintering at a temperature of 800 to 1000 °C and a pressure of 20 to 30 MPa for 5 to 15 min.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] The present invention optimizes the proportion of each component in the multi-element alloy, and improves the sintering performance and the holding force of the matrix on the diamond by introducing Sn with a low melting point. The modified porous carbon is well dispersed in the multi-element alloy, improving the overall strength, so that the grinding performance and service life of the composite material are significantly improved, and at the same time, the thermal conductivity is increased. Description of the Drawings

[0032] Figure 1 Shows a flowchart of the method for preparing the super wear-resistant diamond composite material of the present invention;

[0033] Figure 2 Shows a scanning electron microscope image of the multi-element alloy and diamond at the fracture of the grinding tool sample in Comparative Example 4;

[0034] Figure 3 Show the SEM images of the multi - element alloy and diamond at the fracture of the abrasive sample in Example 1;

[0035] Figure 4 Show the SEM images of the multi - element alloy and diamond at the fracture of the abrasive sample in Example 2;

[0036] Figure 5 Show the SEM images of the multi - element alloy and diamond at the fracture of the abrasive sample in Comparative Example 1;

[0037] Figure 6 Show the SEM images of the multi - element alloy and diamond at the fracture of the abrasive sample in Comparative Example 3. Detailed implementation manners

[0038] In the ranges disclosed in the present invention, the endpoints and any values are not limited to the precise ranges or values. These ranges or values should be understood to include values close to these ranges or values. For numerical ranges, between the endpoint values of each range, between the endpoint values of each range and individual point values, and between individual point values, they can be combined with each other to obtain one or more new numerical ranges, and these numerical ranges should be regarded as specifically disclosed in the present invention.

[0039] The following is a description of some raw materials used in the examples and comparative examples of the present invention:

[0040] The particle sizes of Fe powder, Co powder, Ni powder, Cu powder, W powder, and Sn powder are all 50 μm, and the purities are all greater than 99.99%. They are customized from GRINM Advanced Materials Co., Ltd.;

[0041] Diamond, model D60, with a particle size of 150 - 200 μm, is purchased from Henan Bolai Rong Superhard Materials Co., Ltd.

[0042] Other raw materials not mentioned are common raw materials. The above content is only for helping to explain the present invention and should not be understood as a strict limitation of the present invention. Those skilled in the art can directly purchase from the market or prepare the same / similar raw materials by themselves. These contents will not be elaborated in the examples anymore.

[0043] Next, in combination with the specific embodiments of the present invention, the technical solutions in the embodiments of the present invention will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0044] Example 1

[0045] As Figure 1As shown in the figure, a method for preparing a super wear-resistant diamond composite material is as follows:

[0046] S1. Prepare a multi-element alloy powder: Weigh Fe powder, Co powder, Ni powder, Cu powder, W powder and Sn powder according to the molar ratio of 25:12:13:40:4:6, put them into a graphite mold, and use spark plasma sintering. Keep it for 10 min at a temperature of 900 °C and a pressure of 25 MPa to obtain a multi-element alloy block. Use the gas atomization method to make the alloy block into Fe 25 Co 12 Ni 13 Cu 40 W4Sn6 multi-element alloy powder;

[0047] S2. Prepare the composite material: Mix the multi-element alloy powder, diamond, modified porous carbon, and paraffin in a mass ratio of 100:4:0.6:1, put them into a graphite mold, and use spark plasma sintering. Keep it for 15 min at a temperature of 850 °C and a pressure of 30 MPa to obtain a super wear-resistant diamond composite material.

[0048] Among them, the preparation method of the modified porous carbon includes

[0049] T1. Place zinc citrate in a tubular furnace under a nitrogen atmosphere, and increase the temperature at a rate of 3 °C / min to 700 °C and keep it warm for 2 h. After that, cool it naturally and collect the obtained black solid. Immerse the black solid in 2 mol / L hydrochloric acid to remove inorganic impurities, wash it three times with water and ethanol respectively, then filter and transfer it to a constant temperature oven at 120 °C to dry for 12 h to obtain porous carbon;

[0050] T2. Mix the porous carbon, octylamine, and 60 wt% ethanol aqueous solution in a mass ratio of 3:1:25, stir and mix them at a rotation speed of 350 rpm, and then ultrasonically treat them at an ultrasonic power of 150 W and a frequency of 30 kHz for 5 h. Wash it three times with water and ethanol respectively, then filter and transfer it to a constant temperature oven at 120 °C to dry for 12 h to obtain intercalated porous carbon;

[0051] T3. Mix the intercalated porous carbon, dopamine hydrochloride, and 60 wt% ethanol aqueous solution in a mass ratio of 3:1:75, stir and mix them at a rotation speed of 500 rpm for 5 min, then adjust the pH to 9.3 with 10 wt% ammonia water and keep stirring, react for 12 h. After that, wash it three times with water and ethanol respectively, then filter and transfer it to a constant temperature oven at 120 °C to dry for 12 h to obtain modified porous carbon.

[0052] Example 2

[0053] A method for preparing a super wear-resistant diamond composite material is as follows:

[0054] S1. Preparation of multi - element alloy powder: Weigh Fe powder, Co powder, Ni powder, Cu powder, W powder and Sn powder according to the molar ratio of 25:12:13:40:4:6, put them into a graphite mold, and use spark plasma sintering. Keep it at a temperature of 900 °C and a pressure of 25 MPa for 10 min to obtain a multi - element alloy block; Use the gas atomization method to make the alloy block into Fe 25 Co 12 Ni 13 Cu 40 W4Sn6 multi - element alloy powder;

[0055] S2. Preparation of composite material: Mix the multi - element alloy powder, diamond, modified porous carbon and paraffin in a mass ratio of 100:4:0.6:1, put them into a graphite mold, and use spark plasma sintering. Keep it at a temperature of 850 °C and a pressure of 30 MPa for 15 min to obtain a super - wear - resistant diamond composite material.

[0056] Among them, the preparation method of the modified porous carbon is as follows,

[0057] T1. Place zinc citrate in a tube furnace under a nitrogen atmosphere, with a heating rate of 3 °C / min, heat it to 700 °C and keep it warm for 2 h. After cooling naturally, collect the black solid. Immerse the black solid in 2 mol / L hydrochloric acid to remove inorganic impurities, wash it three times with water and ethanol respectively, then filter and transfer it to a constant - temperature oven at 120 °C for drying for 12 h to obtain porous carbon;

[0058] T2. Mix the porous carbon, octylamine and 60 wt% ethanol aqueous solution in a mass ratio of 3:1:25, stir - mix at a rotation speed of 350 rpm, then ultrasonicate at an ultrasonic power of 150 W and a frequency of 30 kHz for 5 h, wash it three times with water and ethanol respectively, then filter and transfer it to a constant - temperature oven at 120 °C for drying for 12 h to obtain intercalated porous carbon;

[0059] T3. Mix the intercalated porous carbon, dopamine hydrochloride and 60 wt% ethanol aqueous solution in a mass ratio of 3:1:75, stir - mix at a rotation speed of 500 rpm for 5 min, then add ammonium molybdate tetrahydrate which is 0.3 times the mass of the intercalated porous carbon, then adjust the pH to 9.3 with 10 wt% ammonia water and keep stirring, react for 12 h. After completion, wash it three times with water and ethanol respectively, then filter and transfer it to a constant - temperature oven at 120 °C for drying for 12 h to obtain modified porous carbon.

[0060] Example 3

[0061] It is basically the same as Example 2, the difference is that: in step S2, the multi - element alloy powder, diamond, modified porous carbon and binder are mixed in a mass ratio of 100:4:1:1.

[0062] Comparative Example 1

[0063] It is basically the same as Example 2, except that in step S2, the multi-component alloy powder, diamond, modified porous carbon, and binder are mixed in a mass ratio of 100:4:1.2:1.

[0064] Comparative Example 2

[0065] It is basically the same as Example 2, except that the preparation method of the modified porous carbon is as follows:

[0066] T1. Zinc citrate is placed in a tube furnace under a nitrogen atmosphere and heated to 700 °C at a heating rate of 3 °C / min and held for 2 h. After that, it is naturally cooled and the collected black solid is immersed in 2 mol / L hydrochloric acid to remove inorganic impurities. It is washed three times with water and ethanol respectively, then filtered and transferred to a constant temperature oven at 120 °C for drying for 12 h to obtain porous carbon;

[0067] T2. The porous carbon, dopamine hydrochloride, and 60 wt% ethanol aqueous solution are stirred and mixed at a mass ratio of 3:1:75 at a rotation speed of 500 rpm for 5 min. Subsequently, ammonium molybdate tetrahydrate 0.3 times the mass of the intercalated porous carbon is added. Then, the pH is adjusted to 9.3 with 10 wt% ammonia water and stirring is maintained for 12 h. After that, it is washed three times with water and ethanol respectively, then filtered and transferred to a constant temperature oven at 120 °C for drying for 12 h to obtain modified porous carbon.

[0068] Comparative Example 3

[0069] It is basically the same as Example 2, except that the preparation method of the modified porous carbon is as follows:

[0070] T1. Zinc citrate is placed in a tube furnace under a nitrogen atmosphere and heated to 700 °C at a heating rate of 3 °C / min and held for 2 h. After that, it is naturally cooled and the collected black solid is immersed in 2 mol / L hydrochloric acid to remove inorganic impurities. It is washed three times with water and ethanol respectively, then filtered and transferred to a constant temperature oven at 120 °C for drying for 12 h to obtain porous carbon;

[0071] T2. The porous carbon, octylamine, and 60 wt% ethanol aqueous solution are stirred and mixed at a mass ratio of 3:1:25 at a rotation speed of 350 rpm, and then sonicated at an ultrasonic power of 150 W and a frequency of 30 kHz for 5 h. It is washed three times with water and ethanol respectively, then filtered and transferred to a constant temperature oven at 120 °C for drying for 12 h to obtain modified porous carbon.

[0072] Comparative Example 4

[0073] It is basically the same as Example 2, except that porous carbon is used to replace the modified porous carbon;

[0074] The preparation method of the porous carbon is as follows:

[0075] Zinc citrate was placed in a tubular furnace under a nitrogen atmosphere and heated to 700 °C at a heating rate of 3 °C / min and held for 2 h. After that, it was naturally cooled and collected to obtain a black solid. The black solid was immersed in 2 mol / L hydrochloric acid to remove inorganic impurities, washed three times with water and ethanol respectively, filtered and transferred to a constant temperature oven at 120 °C for drying for 12 h to obtain porous carbon.

[0076] Comparative Example 5

[0077] It was basically the same as Example 2, except that: modified porous carbon was not added.

[0078] It should be noted that the graphite molds used in the above examples and comparative examples in the preparation of the composite material were selected according to different needs. For example, when making a grinding tool, the shape was an annular ring, and the prepared diamond composite material presented a grinding wheel with an outer diameter of 25 mm, a working thickness of 10 mm, and a working width of 20 mm combined with an aluminum wheel hub with a matching structure to form a grinding tool; when making a sample for performance testing, a cuboid mold could be selected to make a sample block of 30 mm×12 mm×6 mm.

[0079] Test Example

[0080] In order to study the influence of the modified porous carbon on the bonding state between the multi-element alloy and diamond in the examples and comparative examples, the diamond shedding pits at the fracture of the grinding tools composed of the composite materials prepared in the examples and comparative examples and the embedding state of the multi-element alloy on the diamond at the fracture of the grinding tool specimens were observed. Figure 2 The embedding state of Comparative Example 4 is shown. The matrix holds the diamond well, indicating that the ratio of the multi-element alloy of the present invention has good advantages; Figure 3 It can be seen that the modified porous carbon prepared in Example 1 was mainly dispersed on the surface of the diamond; Figure 4 It can be seen that the modified porous carbon prepared in Example 2 was dispersed on the surface of the diamond and effectively dispersed in the multi-element alloy matrix; Figure 5 It can be seen that adding an excessive amount of modified porous carbon in Comparative Example 1 would form agglomerates on the surface of the diamond and in the multi-element alloy matrix, and such a structure was not conducive to heat transfer; Figure 6 It can be seen that in Comparative Example 3 without adding molybdenum, at the same addition ratio, the modified porous carbon was also prone to form agglomerates on the surface of the diamond and could not be effectively dispersed in the multi-element alloy matrix.

[0081] The diamond composite material samples prepared in the examples and comparative examples were subjected to hardness testing, flexural strength testing, and wear ratio testing. Among them, the Rockwell hardness was measured using an HR-150A Rockwell hardness tester, and the average value was taken after testing 3 times; a universal testing machine was used to perform a three-point bending test on the sample to measure the flexural strength of the test specimen, and the average value was taken after testing 3 times; a brown fused alumina grinding wheel with dimensions of 200 mm × 25 mm × 32 mm was used for grinding against each other. It is the ratio of the loss mass of the grinding brown fused alumina grinding wheel to the loss mass of the test sample (the larger the value, the better the wear resistance). The linear speed of the grinding wheel was 35 m / s, the grinding pressure was 5 N, the grinding time was 10 min, and the average value was taken after testing 3 times. These results are shown in Table 1.

[0082] Table 1 Test results of mechanical properties and wear resistance

[0083] Rockwell hardness (HRB) Flexural strength (MPa) Wear ratio Example 1 103.5 338.3 186.7 Example 2 107.5 366.8 205.6 Example 3 105.3 357.9 199.8 Comparative example 1 94.1 305.6 139.5 Comparative example 2 102.3 326.5 147.5 Comparative example 3 101.5 322.4 157.8 Comparative example 4 92.1 299.2 125.3 Comparative example 5 108.9 318.3 164.5

[0084] From the test results in Table 1, it can be seen that compared with Comparative Example 5 without adding porous carbon and modified porous carbon, the various properties of Comparative Example 4 directly adding porous carbon and Comparative Example 1 with a relatively large amount of modified porous carbon decreased significantly. This is because the porous carbon prepared by calcining zinc citrate has a relatively close interlayer spacing. Although it has a rich pore structure, it still cannot be well dispersed in the multi-element alloy or on the surface of the diamond, agglomerating in the structure and reducing the mechanical properties of the material. And a relatively large amount of modified porous carbon will agglomerate in the multi-element alloy due to uneven internal stress. For Comparative Example 3 with modified porous carbon obtained only through intercalation treatment and Comparative Example 2 without intercalation treatment and modifying molybdenum-containing polydopamine on the surface of the porous carbon, neither can effectively inhibit the decrease in hardness when the carbon material is added to the multi-element alloy system. This is because after intercalation treatment and modification of molybdenum by polydopamine, during the sintering process, polydopamine-polymerized molybdenum is reduced, enhancing the interaction with the multi-element alloy and the diamond, thus significantly improving the mechanical properties and wear resistance of the diamond composite material.

[0085] The thermal conductivity of the diamond composite material samples prepared in the examples and comparative examples was also measured using a laser thermal conductivity analyzer, and the results are shown in Table 2.

[0086] Table 2 Thermal conductivity results

[0087] <![CDATA[Thermal conductivity (W·m -1 ·K -1 )]]> Example 1 57.56 Example 2 64.59 Example 3 61.97 Comparative example 1 58.56 Comparative example 2 53.14 Comparative example 3 51.23 Comparative example 4 48.66 Comparative example 5 45.63

[0088] From the test results in Table 2, it can be seen that compared with Comparative Example 5, after adding porous carbon / modified porous carbon, the thermal conductivity has increased. This is because porous carbon itself has good thermal conductivity. Compared with Example 3 and Comparative Example 1, Example 2 has less modified porous carbon added, but the thermal conductivity is higher. This is because the modified porous carbon is well dispersed on the surface of the multi-element alloy and the diamond, forming a good thermal conduction network and being able to dissipate heat more effectively.

[0089] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent replacements on some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A super wear-resistant diamond composite material, characterized in that, It is obtained by sintering a multi-element alloy, diamond, modified porous carbon, and binder after mixing them in a mass ratio of 90-100:3-5:0.5-1:0.5-2; Among them, the multi-component alloy is Fe 15～30 Co 10～15 Ni 10～15 Cu 30～50 W 2～5 Sn 5～10 ; The preparation method of the modified porous carbon includes, Placing an organic acid metal salt in a protective atmosphere for calcination to obtain porous carbon; Mixing the porous carbon, fatty amine, and ethanol aqueous solution and then performing ultrasonic treatment to obtain intercalated porous carbon; Mixing the intercalated porous carbon, dopamine hydrochloride, and ethanol aqueous solution, adjusting the pH, and then stirring and reacting to obtain modified porous carbon.

2. The super wear-resistant diamond composite material according to claim 1, wherein The mass ratio of the porous carbon, fatty amine, and ethanol aqueous solution is 2-5:1-3:20-30; The ultrasonic treatment is carried out at a power of 100-200 W and a frequency of 20-50 kHz for 3-8 h; The mass ratio of the intercalated porous carbon, dopamine hydrochloride, and ethanol aqueous solution is 2-5:1-3:60-80; The pH is adjusted to 8.5-9.

5.

3. The super wear-resistant diamond composite material according to claim 1, wherein, After stirring the intercalated porous carbon, dopamine hydrochloride, and ethanol aqueous solution, a soluble molybdenum salt with a mass 0.2-0.5 times that of the intercalated porous carbon is also added.

4. The super wear-resistant diamond composite material according to claim 1, characterized in that, The fatty amine has 4-20 carbon atoms.

5. The super wear-resistant diamond composite material according to claim 1, wherein, The particle size of the multi-element alloy is 50-200 μm.

6. The super wear-resistant diamond composite material according to claim 1, wherein The particle size of the diamond is 100-300 μm.

7. The super wear-resistant diamond composite material according to claim 1, characterized in that, The binder includes at least one of paraffin, polyvinyl alcohol, and stearic acid.

8. A method for preparing a super wear-resistant diamond composite material according to any one of claims 1 to 7, characterized in that, Including, Mix Fe powder, Co powder, Ni powder, Cu powder, W powder, and Sn powder and then sinter them to obtain the multi-component alloy Fe 15～30 Co 10～15 Ni 10～ 15 Cu 30～50 W 2～5 Sn 5～10 ; A super wear-resistant diamond composite material is obtained by sintering a multi-element alloy, diamond, modified porous carbon, and binder after mixing them in a mass ratio of 90-100:3-5:0.5-1:0.5-2.

9. The preparation method of the super wear-resistant diamond composite material according to claim 8, characterized in that, The sintering is carried out by spark plasma sintering at a temperature of 800-1000 °C and a pressure of 20-30 MPa for 5-15 min.

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