Diamond micro-powder with good wear resistance and preparation method thereof

Abstract

The invention relates to the technical field of diamond micro-powder, and provides diamond micro-powder with good wear resistance and a preparation method of the diamond micro-powder. The diamond micro-powder with the good wear resistance comprises, by mass, 50-80 parts of diamond micro-powder, 20-40 parts of a binding agent and 2-4 parts of a wetting agent, and the binding agent comprises nitride powder and oxide fibers with the mass ratio being 1: 9-9: 1. By means of the technical scheme, the problem that diamond micro-powder in the prior art is poor in abrasion resistance is solved.

Description

Technical Field

[0001] The invention relates to the technical field of diamond micropowder, and in particular to diamond micropowder with good wear resistance and a preparation method thereof. Background Art

[0002] Diamond has extremely excellent hardness and wear resistance. As a type of diamond with a smaller particle size, diamond micropowder not only inherits the high hardness of diamond, but also increases its interaction force in the production process due to its large specific surface area, thereby further enhancing the wear resistance of diamond micropowder. At present, diamond micropowder is widely used in many fields such as fine grinding and polishing of precision components, mold processing, and bearing processing and manufacturing. However, during the processing, the bonding between diamond micropowders is poor and it is easy to fall off, resulting in unsatisfactory wear resistance of diamond micropowder, which makes the wear resistance of the prepared device unsatisfactory. Therefore, there is an urgent need for a diamond micropowder with good wear resistance. Summary of the invention

[0003] The invention provides a diamond micropowder with good wear resistance and a preparation method thereof, which solves the problem of poor wear resistance of the diamond micropowder in the related art.

[0004] The technical solution of the present invention is as follows: The present invention provides a diamond micropowder with good wear resistance, comprising the following components by mass: 50-80 parts of diamond micropowder, 20-40 parts of a binder, and 2-4 parts of a wetting agent, wherein the binder comprises nitride powder and oxide fiber in a mass ratio of 1:9-9:1.

[0005] As a further technical solution, the nitride powder is silicon nitride powder.

[0006] As a further technical solution, the particle size of the nitride powder includes one or two of 20 nm, 500 nm, 1 μm, and 3 μm.

[0007] As a further technical solution, the oxide fiber includes one or more of silica fiber, alumina fiber, and magnesium oxide fiber.

[0008] As a further technical solution, the mass ratio of the nitride powder to the oxide fiber is 1:3~3:1.

[0009] The present invention further enhances the wear resistance of the diamond micropowder by limiting the mass ratio of the nitride powder to the oxide fiber to 1:3-3:1.

[0010] As a further technical solution, the silicon nitride powder includes silicon nitride with a particle size of 500 nm and silicon nitride with a particle size of 1 μm in a mass ratio of 1:9 to 9:1.

[0011] The present invention achieves particle size grading of silicon nitride with a particle size of 500 nm and silicon nitride with a particle size of 1 μm at a silicon nitride powder mass ratio of 1:9 to 9:1, and the two synergistically enhance the wear resistance of the diamond micropowder.

[0012] As a further technical solution, the mass of silicon nitride with a particle size of 500 nm is ≥ the mass of silicon nitride with a particle size of 1 μm.

[0013] The present invention further enhances the wear resistance of the diamond micro powder by limiting the mass of silicon nitride with a particle size of 500 nm to be greater than the mass of silicon nitride with a particle size of 1 μm.

[0014] As a further technical solution, the mass ratio of the silicon nitride with a particle size of 500 nm to the silicon nitride with a particle size of 1 μm is 3-4:1.

[0015] The present invention further enhances the wear resistance of the diamond micropowder by limiting the mass ratio of silicon nitride with a particle size of 500 nm to silicon nitride with a particle size of 1 μm to 3-4:1.

[0016] As a further technical solution, the wetting agent includes one or more of alcohol, gasoline, and vaseline oil.

[0017] As a further technical solution, the preparation method of the binder comprises the following steps: The nitride powder and the oxide fiber are mixed evenly, sintered at a temperature of 1200-1500° C. for 1-2 hours, and dried to obtain a binder.

[0018] The present invention provides a method for preparing diamond micropowder with good wear resistance, comprising the following steps: Diamond micropowder, a binder, a wetting agent and water are mixed, filtered, dried and sintered to obtain diamond micropowder.

[0019] The working principle and beneficial effects of the present invention are: In the present invention, a diamond micropowder with good wear resistance is provided by compounding nitride powder and oxide fiber as a binder, using diamond micropowder and a wetting agent together, and adjusting and optimizing the amount of each component. Among them, nitride powder and oxide fiber are used together as a binder for diamond micropowder, which reduces the wear amount of diamond micropowder, achieves the technical effect of improving the wear resistance of diamond micropowder, solves the problem of poor wear resistance of diamond micropowder in the prior art, and greatly broadens its application. DETAILED DESCRIPTION

[0020] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] In the following examples and comparative examples, the parameters of the raw materials are as follows: Silicon nitride powder particle size: 20nm, 500nm, 1μm, 3μm; Alumina fiber: diameter 11μm, length 3mm; Diamond powder particle size: 2μm.

[0022] Example 1 A diamond micropowder and a preparation method thereof, comprising the following steps: S1. Evenly mix 5 parts of silicon nitride powder with a particle size of 500 nm and 45 parts of alumina fiber, sinter at 1500° C. for 1 h, and dry at 200° C. to obtain a binder; S2. Mix 50 parts of diamond powder, 20 parts of binder, 2 parts of vaseline oil and 150 parts of water, filter, dry the filter residue at 200°C, granulate, sinter at 500°C for 1.5 hours, and then sinter at 700°C for 1 hour to obtain diamond powder.

[0023] Example 2 A diamond micropowder and a preparation method thereof, comprising the following steps: S1. Evenly mix 45 parts of silicon nitride powder with a particle size of 500 nm and 5 parts of alumina fiber, sinter at 1200° C. for 2 h, and dry at 200° C. to obtain a binder; S2. Mix 80 parts of diamond powder, 40 parts of binder, 4 parts of vaseline oil and 150 parts of water, filter, dry the filter residue at 200°C, granulate, sinter at 500°C for 1.5 hours, and then sinter at 700°C for 1 hour to obtain diamond powder.

[0024] Example 3 A diamond micropowder and a preparation method thereof, comprising the following steps: S1. 30 parts of silicon nitride powder with a particle size of 500 nm and 10 parts of alumina fiber are uniformly mixed, sintered at 1500° C. for 1 h, and dried at 200° C. to obtain a binder; S2. Mix 50 parts of diamond powder, 20 parts of binder, 2 parts of vaseline oil and 150 parts of water, filter, dry the filter residue at 200°C, granulate, sinter at 500°C for 1.5 hours, and then sinter at 700°C for 1 hour to obtain diamond powder.

[0025] Example 4 A diamond micropowder and a preparation method thereof, comprising the following steps: S1. 10 parts of silicon nitride powder with a particle size of 500 nm and 30 parts of alumina fiber are uniformly mixed, sintered at 1500° C. for 1 h, and dried at 200° C. to obtain a binder; S2. Mix 50 parts of diamond powder, 20 parts of binder, 2 parts of vaseline oil and 150 parts of water, filter, dry the filter residue at 200°C, granulate, sinter at 500°C for 1.5 hours, and then sinter at 700°C for 1 hour to obtain diamond powder.

[0026] Example 5 The only difference from Example 1 is that 45 parts of silicon nitride powder with a particle size of 500 nm and 5 parts of alumina fibers are used.

[0027] Example 6 A diamond micropowder and a preparation method thereof, comprising the following steps: S1, 3 parts of silicon nitride powder with a particle size of 500 nm, 27 parts of silicon nitride powder with a particle size of 1 μm, and 10 parts of alumina fiber are uniformly mixed, sintered at 1500° C. for 1 h, and dried at 200° C. to obtain a binder; S2. Mix 50 parts of diamond powder, 20 parts of binder, 2 parts of vaseline oil and 150 parts of water, filter, dry the filter residue at 200°C, granulate, sinter at 500°C for 1.5 hours, and then sinter at 700°C for 1 hour to obtain diamond powder.

[0028] Example 7 The only difference from Example 3 is that the silicon nitride powder with a particle size of 500 nm is replaced by an equal amount of silicon nitride powder with a particle size of 1 μm.

[0029] Example 8 The only difference from Example 6 is that the silicon nitride powder with a particle size of 500 nm is replaced by an equal amount of silicon nitride powder with a particle size of 20 nm.

[0030] Example 9 The only difference from Example 6 is that the silicon nitride powder with a particle size of 1 μm is replaced by an equal amount of silicon nitride powder with a particle size of 3 μm.

[0031] Example 10 The only difference from Example 6 is that the silicon nitride powder with a particle size of 500 nm is 27 parts, and the silicon nitride powder with a particle size of 1 μm is 3 parts.

[0032] Embodiment 11 The only difference from Example 6 is that the silicon nitride powder with a particle size of 500 nm is 15 parts, and the silicon nitride powder with a particle size of 1 μm is 15 parts.

[0033] Example 12 The only difference from Example 6 is that the silicon nitride powder with a particle size of 500 nm is 22.5 parts, and the silicon nitride powder with a particle size of 1 μm is 7.5 parts.

[0034] Example 13 The only difference from Example 6 is that the silicon nitride powder with a particle size of 500 nm is 24 parts, and the silicon nitride powder with a particle size of 1 μm is 6 parts.

[0035] Comparative Example 1 A diamond micropowder and a preparation method thereof, comprising the following steps: 50 parts of diamond powder, 20 parts of silicon nitride powder with a particle size of 500 nm, 2 parts of vaseline oil and 150 parts of water were mixed, filtered, and the filter residue was dried at 200° C., granulated, sintered at 500° C. for 1.5 hours, and then sintered at 700° C. for 1 hour to obtain diamond powder.

[0036] Comparative Example 2 A diamond micropowder and a preparation method thereof, comprising the following steps: 50 parts of diamond powder, 20 parts of alumina fiber, 2 parts of vaseline oil and 150 parts of water were mixed, filtered, and the filter residue was dried at 200°C, granulated, sintered at 500°C for 1.5 hours, and then sintered at 700°C for 1 hour to obtain diamond powder.

[0037] Test example The diamond powder prepared in Examples 1 to 13 and Comparative Examples 1 to 2 was pressure-molded using a manual hydraulic press, the pressure of the manual hydraulic press was 120 KPa, the pressure holding time was 15 seconds, and then the pressure was held at 1000 KPa for 1 minute to obtain a green body, and the green body was sintered at 1000° C. and kept warm for 1 hour to obtain a wear-resistant material. The wear-resistant performance of the wear-resistant material was tested according to the JB / T 3235-2013 standard, and the results are shown in Table 1.

[0038] Table 1 Wear resistance test results of diamond micro powder wear-resistant materials of Examples 1 to 13 and Comparative Examples 1 to 2

[0039] Compared with Comparative Examples 1 and 2, Examples 1 and 3 to 13 are compound uses of silicon nitride powder and alumina fiber. As a result, the wear amount of the diamond micropowder prepared in Examples 1 and 3 to 13 is less than that in Comparative Examples 1 to 2, indicating that the silicon nitride powder and alumina fiber in the diamond micropowder synergistically reduce the wear amount of the diamond micropowder and enhance the wear resistance of the diamond micropowder.

[0040] The wear amount of the diamond micropowder prepared in Examples 3-4 is less than that in Examples 1 and 5, indicating that the wear amount of the diamond micropowder can be further reduced by limiting the mass ratio of silicon nitride powder to alumina fiber to 1:3-3:1, thereby further enhancing the wear resistance of the diamond micropowder.

[0041] The wear amount of the diamond micropowder prepared in Example 6 is less than that in Example 3 and Examples 7 to 9, indicating that the compound use of silicon nitride powder with a particle size of 500 nm and silicon nitride powder with a particle size of 1 μm can further reduce the wear amount of the diamond micropowder and further enhance the wear resistance of the diamond micropowder.

[0042] The wear amount of the diamond powder prepared in Examples 10 to 13 is less than that in Example 6, indicating that by limiting the mass of silicon nitride with a particle size of 500 nm ≥ the mass of silicon nitride with a particle size of 1 μm, the wear amount of the diamond powder can be further reduced and the wear resistance of the diamond powder can be further enhanced.

[0043] The wear amount of the diamond micropowder prepared in Examples 12 to 13 is less than that in Examples 10 and 11, indicating that by limiting the mass ratio of silicon nitride powder with a particle size of 500 nm to silicon nitride powder with a particle size of 1 μm to 3 to 4:1, the wear amount of the diamond micropowder can be further reduced, and the wear resistance of the diamond micropowder can be further enhanced.

[0044] The above are only preferred embodiments of the present invention and are 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 in the protection scope of the present invention.

Claims

1. A diamond powder with good wear resistance, characterized in that: The invention comprises the following components by weight: 50-80 parts of diamond micropowder, 20-40 parts of a binder, and 2-4 parts of a wetting agent. The binder comprises nitride powder and oxide fiber in a mass ratio of 1:9-9:

1.

2. The diamond micropowder with good wear resistance according to claim 1, characterized in that: The nitride powder is silicon nitride powder.

3. The diamond micro powder with good wear resistance according to claim 1, characterized in that: The oxide fibers include one or more of silicon dioxide fibers, aluminum oxide fibers, and magnesium oxide fibers.

4. The diamond micro powder with good wear resistance according to claim 1, characterized in that: The mass ratio of the nitride powder to the oxide fiber is 1:3 to 3:

1.

5. The diamond micro powder with good wear resistance according to claim 2, characterized in that: The silicon nitride powder includes silicon nitride with a particle size of 500 nm and silicon nitride with a particle size of 1 μm in a mass ratio of 1:9 to 9:

1.

6. The diamond micro powder with good wear resistance according to claim 5, characterized in that: The mass of the silicon nitride with a particle size of 500 nm is ≥ the mass of the silicon nitride with a particle size of 1 μm.

7. The diamond micro powder with good wear resistance according to claim 6, characterized in that: The mass ratio of the silicon nitride with a particle size of 500 nm to the silicon nitride with a particle size of 1 μm is 3-4:

1.

8. The diamond micro powder with good wear resistance according to claim 1, characterized in that: The wetting agent includes one or more of alcohol, gasoline and vaseline oil.

9. The diamond micropowder with good wear resistance according to any one of claims 1 to 8, characterized in that: The preparation method of the binding agent comprises the following steps: The nitride powder and the oxide fiber are mixed evenly, sintered at a temperature of 1200-1500° C. for 1-2 hours, and dried to obtain a binder.

10. The method for preparing diamond micropowder with good wear resistance according to any one of claims 1 to 9, characterized in that: The following steps are involved: Diamond micropowder, a binder, a wetting agent and water are mixed, filtered, dried and sintered to obtain diamond micropowder.

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