Wear-resistant multi-element alloy-diamond composite material and method for manufacturing the same

Abstract

The application relates to the field of diamond composite materials, in particular to a wear-resistant multi-element alloy-diamond composite material and a preparation method thereof. 35 Ni 20 Cr 15 Fe 20 Co5W3Ti2, the wear-resistant multi-element alloy-diamond composite material prepared by the application has excellent wear resistance and high hardness, and the comprehensive performance is superior to that of the existing diamond superhard abrasive.

Description

Technical Field

[0001] This invention relates to the field of diamond composite materials, specifically to a wear-resistant multi-element alloy-diamond composite material and its preparation method. Background Technology

[0002] Diamond possesses advantages such as high hardness, good wear resistance, high thermal conductivity, good electrical insulation, and strong corrosion resistance, making it widely used in cutting, grinding, drilling, and the electronics industry. Diamond composite superhard abrasives, such as grinding heads and grinding discs, play an increasingly important role in high-end chip processing and 3C ceramics. However, with increasing demands for processing precision and efficiency, and the growing emphasis on energy conservation and environmental protection in recent years, existing diamond abrasive products are increasingly unable to meet the needs of the high-precision market. A significant reason for this is the need to further improve the bonding performance between diamond and the binder phase.

[0003] Diamond has high interfacial energy with most metals, meaning diamond particles can only be mechanically embedded in the binder phase, resulting in weak interfacial bonding between the two phases. During use, diamond tools may experience abnormal fractures under grinding forces, or the exposed height of the diamond abrasive grains may be less than half their diameter. In such cases, the diamond particles lose the hold of the binder phase and detach on their own, limiting their working efficiency and reducing the lifespan and processing efficiency of diamond superhard abrasives. Summary of the Invention

[0004] Purpose of the invention: To address the above-mentioned technical problems, this invention proposes a wear-resistant multi-element alloy-diamond composite material and its preparation method.

[0005] The technical solution adopted is as follows:

[0006] A wear-resistant multi-element alloy-diamond composite material, made of a multi-element alloy and diamond, wherein the multi-element alloy is Cu. 35 Ni 20 Cr 15 Fe 20 Co5W3Ti2.

[0007] Furthermore, the surface of the diamond is coated with a metallization layer.

[0008] Furthermore, the metallization layer is composed of strong carbide-forming elements and rare earth elements.

[0009] Furthermore, the strong carbide-forming element is any one or more combinations of Ti, Zr, V, Ta, and Nb.

[0010] Furthermore, the rare earth element is any one or more combinations of Gd, Tb, Dy, Ho, Er, Tm, and Lu.

[0011] Furthermore, the method for preparing the diamond is as follows:

[0012] After mixing and compacting strong carbide-forming element powder, rare earth element powder, and diamond micro powder, a mixed salt is applied on top. Salt bath plating is then performed at 950-1100℃ for 30-90 minutes to obtain diamond with a metallized layer on the surface.

[0013] Furthermore, the mixed salt comprises potassium chloride and sodium chloride in a molar ratio of 1-5:1-5.

[0014] Furthermore, the weight ratio of the strong carbide-forming element powder, rare earth element powder, and diamond micro powder is 1-2:0.1-0.5:2-5.

[0015] Furthermore, the diamond micro powder is pretreated by soaking in acid solution.

[0016] This invention also provides a method for preparing a wear-resistant multi-element alloy-diamond composite material:

[0017] High-purity Cu, Ni, Cr, Fe, Co, W, and Ti are used as raw materials to smelt alloy blocks. The alloy blocks are then processed into multi-element alloy powder using a gas atomization method. The multi-element alloy powder is mixed with diamond at a weight ratio of 5-15:1 and pressed into shape. Under a pressure of 40-60 MPa, the temperature is first raised to 700-800℃ at a heating rate of 100-200℃ / min, and then raised to 1000-1100℃ at a heating rate of 10-50℃ / min. The temperature is then held at this temperature for sintering for 10-30 minutes, and then the pressure is restored to normal. The sintering is then continued for another 5-15 minutes in a mixed atmosphere of hydrogen, nitrogen, and boron trichloride.

[0018] Beneficial effects of the present invention: The present invention provides a wear-resistant multi-element alloy-diamond composite material, Cu 35 Ni 20 Cr 15 Fe 20 Co5W3Ti2 serves as the binder matrix, and this alloy possesses excellent characteristics such as high strength and toughness, wear resistance, and corrosion resistance. The solid solution formed also inhibits the formation of complex compounds, making it an ideal material for metal-based binder phases in diamond abrasives.

[0019] After the diamond-coated surface is coated with a metallization layer, the interfacial reaction between the diamond and the binder phase is optimized, the bonding strength is improved, and the binder phase has a greater ability to hold the diamond abrasive grains. The diamond will not easily fall off during the wear process. In addition, the metallization layer inhibits the graphitization of the diamond and reduces the thermal damage of the diamond, thereby improving the wear resistance of the composite material. The introduction of an appropriate amount of rare earth element powder in the metallization layer can improve the density of the metallization layer, making the metallization layer less prone to cracking and falling off, reducing the number of diamonds falling off during the wear process, and thus significantly improving the grinding efficiency and service life of the composite material.

[0020] Sintering under a boron trichloride atmosphere allows boron to react with the metal elements in the composite material to generate high-hardness, high-strength, and wear-resistant borides, thereby increasing the surface hardness of the composite material and improving its wear resistance. The wear-resistant multi-alloy-diamond composite material prepared by this invention has excellent wear resistance and high hardness, and its overall performance is superior to that of existing diamond superhard abrasives. Attached Figure Description

[0021] Figure 1 The image shows the transverse fracture morphology of the composite material prepared in Example 1. Detailed Implementation

[0022] Unless otherwise specified in the examples, the conditions were performed under standard conditions or as recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all commercially available products. Techniques not mentioned in this invention refer to existing technologies. Unless otherwise specified, the following examples and comparative examples are parallel experiments, using the same processing steps and parameters.

[0023] Example 1:

[0024] A wear-resistant multi-element alloy-diamond composite material:

[0025] Composed of multi-element alloy Cu 35 Ni 20 Cr 15 Fe 20 It is made of Co5W3Ti2 and diamond with a metallized layer on the surface. The specific preparation method is as follows:

[0026] Diamond micropowder with a particle size distribution of 10-30 μm was soaked in a 20% hydrochloric acid solution for 10 hours, filtered, thoroughly washed with water, and dried. The resulting diamond micropowder was then mixed with Ti powder and Dy powder in a weight ratio of 4:1:0.25 and compacted. A mixed salt consisting of potassium chloride and sodium chloride in a molar ratio of 1:1 was then applied to the mixture, and the mixture was heated to 1100℃ and held for 60 minutes for salt bath plating to obtain diamond with a metallized surface. High-purity Cu, Ni, Cr, Fe, and other minerals were weighed according to a molar ratio of 35:20:15:20:5:3:2. Co, W, and Ti are smelted into an alloy block, which is then atomized into a multi-element alloy powder. The multi-element alloy powder is mixed with diamond at a weight ratio of 9:1 and pressed into shape at 30 MPa. Under a pressure of 50 MPa, the temperature is first raised to 750°C at a heating rate of 100°C / min, and then raised to 1100°C at a heating rate of 20°C / min. After holding at this temperature for 30 min, the pressure is removed, and the air in the sintering furnace is replaced with a mixed gas of hydrogen, nitrogen, and boron trichloride in a volume ratio of 4:5:1. The sintering is then continued for another 10 min.

[0027] Example 2:

[0028] A wear-resistant multi-element alloy-diamond composite material:

[0029] Composed of multi-element alloy Cu 35 Ni 20 Cr 15 Fe 20 It is made of Co5W3Ti2 and diamond with a metallized layer on the surface. The specific preparation method is as follows:

[0030] Diamond micropowder with a particle size distribution of 10-30 μm was soaked in a 20% hydrochloric acid solution for 10 hours, filtered, thoroughly washed with water, and dried. The resulting diamond micropowder was then mixed with Ti powder and Dy powder in a weight ratio of 4:1:0.25 and compacted. A mixed salt consisting of potassium chloride and sodium chloride in a molar ratio of 1:1 was then applied to the mixture, and the mixture was heated to 1100℃ and held for 60 minutes for salt bath plating to obtain diamond with a metallized layer on the surface. High-purity Cu, Ni, Cr, Fe, and C were weighed according to a molar ratio of 35:20:15:20:5:3:2. O, W, and Ti are smelted into an alloy block, which is then atomized into a multi-element alloy powder. The multi-element alloy powder is mixed with diamond at a weight ratio of 15:1 and pressed into shape at 30 MPa. Under a pressure of 50 MPa, the temperature is first raised to 800°C at a heating rate of 100°C / min, and then raised to 1100°C at a heating rate of 20°C / min. After holding at this temperature for 30 min, the pressure is removed, and the air in the sintering furnace is replaced with a mixed gas of hydrogen, nitrogen, and boron trichloride in a volume ratio of 4:5:1. The sintering is then continued for another 15 min.

[0031] Example 3:

[0032] A wear-resistant multi-element alloy-diamond composite material:

[0033] Composed of multi-element alloy Cu 35 Ni 20 Cr 15 Fe 20 It is made of Co5W3Ti2 and diamond with a metallized layer on the surface. The specific preparation method is as follows:

[0034] Diamond micropowder with a particle size distribution of 10-30 μm was soaked in a 20% hydrochloric acid solution for 10 hours, filtered, thoroughly washed with water, and dried. The resulting diamond micropowder was then mixed with Ti powder and Dy powder in a weight ratio of 4:1:0.25 and compacted. A mixed salt consisting of potassium chloride and sodium chloride in a molar ratio of 1:1 was then applied to the mixture, and the mixture was heated to 1100℃ and held for 60 minutes for salt bath plating to obtain diamond with a metallized surface. High-purity Cu, Ni, Cr, Fe, and other minerals were weighed according to a molar ratio of 35:20:15:20:5:3:2. Co, W, and Ti are smelted into an alloy block, which is then atomized into a multi-element alloy powder. The multi-element alloy powder is mixed with diamond at a weight ratio of 5:1 and pressed into shape at 30 MPa. Under a pressure of 50 MPa, the temperature is first raised to 700°C at a heating rate of 100°C / min, and then raised to 1100°C at a heating rate of 20°C / min. After holding at this temperature for 30 min, the pressure is removed, and the air in the sintering furnace is replaced with a mixed gas of hydrogen, nitrogen, and boron trichloride in a volume ratio of 4:5:1. The sintering is then continued for another 5 min.

[0035] Comparative Example 1:

[0036] It is basically the same as Example 1, except that Dy powder is not added.

[0037] Comparative Example 2:

[0038] The method is basically the same as in Example 1, except that sintering is performed while maintaining an air atmosphere. The specific preparation method is as follows:

[0039] Diamond micropowder with a particle size distribution of 10-30 μm was soaked in a 20% hydrochloric acid solution for 10 hours, filtered, thoroughly washed with water, and dried. The resulting diamond micropowder was then mixed with Ti powder and Dy powder in a weight ratio of 4:1:0.25 and compacted. A mixed salt consisting of potassium chloride and sodium chloride in a molar ratio of 1:1 was then applied to the mixture, and the mixture was heated to 1100℃ and held for 60 minutes for salt bath plating to obtain diamond with a metallized layer on the surface. The molar ratio was 35:20:15:20:5:3: 2. Weigh high-purity Cu, Ni, Cr, Fe, Co, W, and Ti and melt them to form an alloy block. Use a gas atomization method to make the alloy block into a multi-element alloy powder. Mix the multi-element alloy powder with diamond at a weight ratio of 9:1 and press it into shape at 30 MPa. Under a pressure of 50 MPa, first heat it to 750°C at a heating rate of 100°C / min, and then heat it to 1100°C at a heating rate of 20°C / min. Hold it at this temperature for 30 min, then remove the pressure and continue to hold it at this temperature for 10 min.

[0040] Performance testing:

[0041] The composite materials prepared in Examples 1-3 and Comparative Examples 1-2 were used as samples for performance testing;

[0042] The Brinell hardness (HB) of the sample was measured using a BUEHLER 5104 microhardness tester.

[0043] The room temperature tribological properties of the specimens were studied using an MMQ-02G tribological testing machine, and the friction coefficient and volumetric wear rate were calculated.

[0044] The wear ratio of the samples was measured according to the standard JB / T 3235-2013 by the National Abrasives and Grinding Tools Quality Supervision and Inspection Center.

[0045] The test results are shown in Table 1 below:

[0046] Table 1:

[0047]

[0048] As shown in Table 1 above, the wear-resistant multi-alloy-diamond composite material prepared by the present invention has excellent wear resistance and high hardness, and its comprehensive performance is superior to that of existing diamond superhard abrasives.

[0049] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A wear-resistant multi-element alloy-diamond composite material, characterized in that, Made of a multi-element alloy and diamond, wherein the multi-element alloy is Cu 35 Ni 20 Cr 15 Fe 20 Co5W3Ti2; The surface of the diamond is coated with a metallization layer; The metallization layer is composed of strong carbide-forming elements and rare earth elements; The strong carbide-forming element is any one or more combinations of Ti, Zr, V, Ta, and Nb; The rare earth elements are any one or more combinations of Gd, Tb, Dy, Ho, Er, Tm, and Lu; The preparation method of the above wear-resistant multi-element alloy-diamond composite material: High-purity Cu, Ni, Cr, Fe, Co, W, and Ti are used as raw materials to smelt alloy blocks. The alloy blocks are then processed into multi-element alloy powder using a gas atomization method. The multi-element alloy powder is mixed with diamond at a weight ratio of 5-15:1 and pressed into shape. Under a pressure of 40-60 MPa, the temperature is first raised to 700-800℃ at a heating rate of 100-200℃ / min, and then raised to 1000-1100℃ at a heating rate of 10-50℃ / min. The temperature is then held at this temperature for sintering for 10-30 minutes, and then the pressure is restored to normal. The sintering is then continued for another 5-15 minutes in a mixed atmosphere of hydrogen, nitrogen, and boron trichloride.

2. The wear-resistant multi-element alloy-diamond composite material as described in claim 1, characterized in that, The diamond is prepared as follows: After mixing and compacting strong carbide-forming element powder, rare earth element powder, and diamond micro powder, a mixed salt is applied on top. Salt bath plating is then performed at 950-1100℃ for 30-90 minutes to obtain diamond with a metallized layer on the surface.

3. The wear-resistant multi-element alloy-diamond composite material as described in claim 2, characterized in that, The mixed salt comprises potassium chloride and sodium chloride in a molar ratio of 1-5:1-5.

4. The wear-resistant multi-element alloy-diamond composite material as described in claim 2, characterized in that, The weight ratio of the strong carbide-forming element powder, rare earth element powder, and diamond micro powder is 1-2:0.1-0.5:2-5.

5. The wear-resistant multi-element alloy-diamond composite material as described in claim 2, characterized in that, The diamond micro powder was pretreated by soaking in acid.

Images