Diamond micropowder with good wear resistance and preparation method thereof

Abstract

The application relates to the technical field of diamond micro-powder, and discloses diamond micro-powder with good wear resistance and a preparation method thereof. The diamond micro-powder with good wear resistance comprises the following components in parts by mass: 50-80 parts of diamond micro-powder, 20-40 parts of a bonding agent, 2-4 parts of a wetting agent, and the bonding agent comprises nitride powder and oxide fiber in a mass ratio of 1:9-9:1. The technical scheme solves the problem of poor wear resistance of the diamond micro-powder in the prior art.

Description

Technical Field

[0001] This invention relates to the field of diamond micron powder technology, specifically to a diamond micron powder with good wear resistance and its preparation method. Background Technology

[0002] Diamond possesses exceptional hardness and wear resistance. As a type of diamond with a small particle size, diamond micron powder not only inherits the high hardness of diamond but also, due to its larger specific surface area, increases the interaction forces during the production process, thereby further enhancing its wear resistance. Currently, diamond micron powder is widely used in precision grinding and polishing of components, mold processing, bearing manufacturing, and many other fields. However, during processing, the bonding between diamond micron powder particles is poor, making them prone to detachment, resulting in less than ideal wear resistance. Consequently, the wear resistance of the manufactured devices is not ideal. Therefore, there is an urgent need for a diamond micron powder with good wear resistance. Summary of the Invention

[0003] This invention proposes a diamond micro powder with good wear resistance and its preparation method, which solves the problem of poor wear resistance of diamond micro powder in related technologies.

[0004] The technical solution of the present invention is as follows: This invention proposes a diamond micro powder with good wear resistance, comprising the following components by weight: 50-80 parts diamond micro powder, 20-40 parts binder, and 2-4 parts wetting agent. The binder comprises nitride powder and oxide fiber in a mass ratio of 1:9 to 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 the following: 20nm, 500nm, 1μm, and 3μm.

[0007] As a further technical solution, the oxide fiber includes one or more of silicon dioxide fiber, aluminum oxide 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 to 3:1.

[0009] This invention further enhances the wear resistance of diamond micron powder by limiting the mass ratio of nitride powder to oxide fiber to 1:3 to 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] This invention utilizes a particle size distribution of silicon nitride powder with a mass ratio of 1:9 to 9:1, consisting of silicon nitride with a particle size of 500 nm and silicon nitride with a particle size of 1 μm. The two particles synergistically enhance the wear resistance of diamond micropowder.

[0012] As a further technical solution, the mass of silicon nitride with a particle size of 500 nm is greater than or equal to the mass of silicon nitride with a particle size of 1 μm.

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

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

[0015] This invention further enhances the wear resistance of diamond micro powder 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 petrolatum.

[0017] As a further technical solution, the preparation method of the binder includes the following steps: The nitride powder and oxide fiber are mixed evenly, calcined at 1200~1500℃ for 1~2 hours, and dried to obtain the binder.

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

[0019] The working principle and beneficial effects of this invention are as follows: In this invention, a diamond micro powder with good wear resistance is provided by using a compound of nitride powder and oxide fiber as a binder, along with diamond micro powder and a wetting agent, and by adjusting and optimizing the dosage of each component. The nitride powder and oxide fiber, acting together as binders for the diamond micro powder, reduce the wear amount of the diamond micro powder, achieving the technical effect of improving its wear resistance. This solves the problem of poor wear resistance of diamond micro powder in the prior art and greatly expands its application. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. 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 of ordinary skill in the art without creative effort 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: 11μm in diameter, 3mm in length; Diamond micron powder particle size: 2μm.

[0022] Example 1 A method for preparing diamond micro powder includes the following steps: S1. Mix 5 parts of silicon nitride powder with a particle size of 500nm and 45 parts of alumina fiber evenly, calcine at 1500℃ for 1h, and dry at 200℃ to obtain a binder. S2. Mix 50 parts of diamond micro powder, 20 parts of binder, 2 parts of petroleum jelly and 150 parts of water, filter, dry the filter residue at 200℃, granulate, sinter at 500℃ for 1.5h, and then sinter at 700℃ for 1h to obtain diamond micro powder.

[0023] Example 2 A method for preparing diamond micro powder includes the following steps: S1. Mix 45 parts of silicon nitride powder with a particle size of 500 nm and 5 parts of alumina fiber evenly, calcine at 1200℃ for 2 hours, and dry at 200℃ to obtain a binder; S2. Mix 80 parts of diamond micro powder, 40 parts of binder, 4 parts of petroleum jelly oil and 150 parts of water, filter, dry the filter residue at 200℃, granulate, sinter at 500℃ for 1.5h, and then sinter at 700℃ for 1h to obtain diamond micro powder.

[0024] Example 3 A method for preparing diamond micro powder includes the following steps: S1. Mix 30 parts of silicon nitride powder with a particle size of 500nm and 10 parts of alumina fiber evenly, calcine at 1500℃ for 1h, and dry at 200℃ to obtain a binder; S2. Mix 50 parts of diamond micro powder, 20 parts of binder, 2 parts of petroleum jelly and 150 parts of water, filter, dry the filter residue at 200℃, granulate, sinter at 500℃ for 1.5h, and then sinter at 700℃ for 1h to obtain diamond micro powder.

[0025] Example 4 A method for preparing diamond micro powder includes the following steps: S1. Mix 10 parts of silicon nitride powder with a particle size of 500nm and 30 parts of alumina fiber evenly, calcine at 1500℃ for 1h, and dry at 200℃ to obtain a binder; S2. Mix 50 parts of diamond micro powder, 20 parts of binder, 2 parts of petroleum jelly and 150 parts of water, filter, dry the filter residue at 200℃, granulate, sinter at 500℃ for 1.5h, and then sinter at 700℃ for 1h to obtain diamond micro powder.

[0026] Example 5 The only difference from Example 1 is the addition of 45 parts of silicon nitride powder with a particle size of 500 nm and 5 parts of alumina fiber.

[0027] Example 6 A method for preparing diamond micro powder includes the following steps: S1. Mix 3 parts of silicon nitride powder with a particle size of 500nm, 27 parts of silicon nitride powder with a particle size of 1μm, and 10 parts of alumina fiber evenly, calcine at 1500℃ for 1h, and dry at 200℃ to obtain a binder. S2. Mix 50 parts of diamond micro powder, 20 parts of binder, 2 parts of petroleum jelly and 150 parts of water, filter, dry the filter residue at 200℃, granulate, sinter at 500℃ for 1.5h, and then sinter at 700℃ for 1h to obtain diamond micro 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 with 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 with 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 with 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 27 parts of silicon nitride powder with a particle size of 500 nm and 3 parts of silicon nitride powder with a particle size of 1 μm are used.

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

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

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

[0035] Comparative Example 1 A method for preparing diamond micro powder includes the following steps: 50 parts of diamond micro powder, 20 parts of silicon nitride powder with a particle size of 500 nm, 2 parts of petroleum jelly oil and 150 parts of water were mixed and filtered. The filter residue was dried at 200℃, granulated, sintered at 500℃ for 1.5 h and then sintered at 700℃ for 1 h to obtain diamond micro powder.

[0036] Comparative Example 2 A method for preparing diamond micro powder includes the following steps: 50 parts of diamond micro powder, 20 parts of alumina fiber, 2 parts of petroleum jelly oil and 150 parts of water were mixed and filtered. The filter residue was dried at 200℃, granulated, sintered at 500℃ for 1.5h and then sintered at 700℃ for 1h to obtain diamond micro powder.

[0037] Test case The diamond micropowders prepared in Examples 1-13 and Comparative Examples 1-2 were pressure-formed using a manual hydraulic press. The pressure of the manual hydraulic press was 120 kPa, the holding time was 15 s, and then the pressure was held at 1000 kPa for 1 min to obtain a green body. The green body was then sintered at 1000℃ for 1 h to obtain the wear-resistant material. The wear resistance of the wear-resistant material was tested according to JB / T 3235-2013 standard, and the results are shown in Table 1.

[0038] Table 1. Test results of wear resistance of diamond micronized wear-resistant materials in Examples 1-13 and Comparative Examples 1-2.

[0039] Compared with Comparative Examples 1 and 2, Examples 1 and 3-13 used a combination of silicon nitride powder and alumina fiber. As a result, the wear amount of the diamond micro powder prepared in Examples 1 and 3-13 was less than that in Comparative Examples 1 and 2, indicating that silicon nitride powder and alumina fiber synergistically reduced the wear amount of diamond micro powder and enhanced its wear resistance.

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

[0041] The wear amount of the diamond micro powder prepared in Example 6 was less than that in Examples 3 and 7-9, indicating that the combined 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 diamond micro powder and further enhance the wear resistance of diamond micro powder.

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

[0043] The wear amount of the diamond micro powder prepared in Examples 12-13 was 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 3-4:1, the wear amount of diamond micro powder can be further reduced and the wear resistance of diamond micro powder can be further enhanced.

[0044] The above are merely 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 within the protection scope of the present invention.

Claims

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

1. The nitride powder is silicon nitride powder; The oxide fiber is alumina fiber; The method for preparing the binder includes the following steps: The nitride powder and oxide fiber are mixed evenly, calcined at 1200~1500℃ for 1~2 hours, and dried to obtain the binder.

2. 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.

3. The diamond micro powder with good wear resistance according to claim 1, characterized in that, The silicon nitride powder comprises 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.

4. The diamond micro powder with good wear resistance according to claim 3, characterized in that, The mass of silicon nitride with a particle size of 500 nm is greater than or equal to the mass of silicon nitride with a particle size of 1 μm.

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

1.

6. 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 petrolatum.

7. A method for preparing diamond micron powder with good wear resistance according to any one of claims 1 to 6, characterized in that, Includes the following steps: Diamond micro powder, binder, wetting agent and water are mixed, filtered, dried and sintered to obtain diamond micro powder.

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