A lubricant particle and a method of making the same

Abstract

The present application relates to the technical field of solid lubricant, and particularly relates to a lubricant particle, which comprises a solid lubricant and a binder, the solid lubricant comprises natural graphite, molybdenum disulfide, hexagonal boron nitride and silicon dioxide; the mass content of the natural graphite is 5% to 20% based on the total mass of the solid lubricant, the mass content of the molybdenum disulfide is 5% to 20%, the mass content of the hexagonal boron nitride is 5% to 20%, and the mass content of the silicon dioxide is 40% to 85%. The lubricant particle of the present application can replace the existing powder solid lubricant to solve the problem that the powder solid lubricant is added into the metal binder, is dispersed and distributed in the carcass, hinders the combination of metal elements, and the lubricants are connected and bridged, further hindering the combination of metal elements.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of solid lubricant, in particular to a lubricant particle and a preparation method thereof. BACKGROUND

[0002] The powder or film solid used on the surface to prevent and protect the friction surface from damage and reduce friction and wear when doing relative motion is called solid lubricant. Solid lubricant is widely used in metal bond abrasive tools. In use, graphite powder, molybdenum disulfide powder and hexagonal boron nitride are mostly used. They are added to the metal bond in the form of powder, which will be dispersedly distributed in the matrix, hinder the combination of metal elements, and the lubricants will be connected and bridged, further hindering the bonding force of metal elements. In view of the above problems, the inventors of the present application have conducted in-depth research on the problem, and thus the present application is produced. SUMMARY

[0003] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structure particularly pointed out in the written description and the drawings.

[0004] The present application aims to overcome the above-mentioned deficiencies, and provides a lubricant particle and a preparation method thereof. The lubricant particle of the present application can replace the existing powder solid lubricant to solve the problem that the powder solid lubricant added to the metal bond will be dispersedly distributed in the matrix, hinder the combination of metal elements, and the lubricants will be connected and bridged, further hindering the bonding force of metal elements.

[0005] To achieve the above-mentioned purpose, the technical solution of the present application is to provide a lubricant particle, which comprises a solid lubricant and a binder, wherein the solid lubricant comprises natural graphite, molybdenum disulfide, hexagonal boron nitride and silicon dioxide.

[0006] Based on the total mass of the solid lubricant, the mass content of the natural graphite is 5% to 20%, the mass content of the molybdenum disulfide is 5% to 20%, the mass content of the hexagonal boron nitride is 5% to 20%, and the mass content of the silicon dioxide is 40% to 85%.

[0007] The present application uses silicon dioxide as the main component, and natural graphite, molybdenum disulfide and hexagonal boron nitride as the auxiliary component. The natural graphite, molybdenum disulfide and hexagonal boron nitride are uniformly adhered to the surface of the silicon dioxide by using the binder, so that the solid lubricant is formed in the form of particles, greatly enhancing the slow-release effect of the solid lubricant and greatly improving the compressive strength of the solid lubricant.

[0008] In some embodiments, the binder is silica sol or / and aluminum dihydrogen phosphate. The present application uses silica sol or aluminum dihydrogen phosphate as the binder, so that the structure of the lubricant particles is more stable and firm.

[0009] In some embodiments, the mass content of the silica sol is 0% to 80% and the mass content of the aluminum dihydrogen phosphate is 20% to 100% based on the total mass of the binder. The present application uses silica sol and aluminum dihydrogen phosphate as the binder, and by reasonable proportioning, the binder plays a great adhesion role in the lubricant, thereby ensuring the stability and firmness of the structure of the lubricant particles.

[0010] In some embodiments, the mass content of the binder is 10% to 30% of the mass content of the solid lubricant. The present application ensures the stability and firmness of the structure of the lubricant particles by reasonably proportioning the binder and the solid lubricant.

[0011] In some embodiments, the particle size of the natural graphite is 150 to 250 mesh, the particle size of the molybdenum disulfide is 150 to 250 mesh, the particle size of the hexagonal boron nitride is 150 to 250 mesh, and the particle size of the silicon dioxide is 150 to 250 mesh. The present application controls the particle size of the silicon dioxide, the natural graphite, the molybdenum disulfide and the hexagonal boron nitride, so that the natural graphite, the molybdenum disulfide and the hexagonal boron nitride can be firmly attached to the surface of the silicon dioxide.

[0012] In some embodiments, the compressive strength of the lubricant particles is ≥50N. The compressive strength of the lubricant particles of the present application is above 50N, and the lubricant particles will not be dispersed in the carcass to hinder the combination of metal elements.

[0013] The present application also provides a preparation method of the lubricant particles, comprising the following steps:

[0014] The silicon dioxide is placed in a container for stirring, and water is added for stirring at the same time to obtain silicon dioxide wet material;

[0015] The molybdenum disulfide, the hexagonal boron nitride and the natural graphite are uniformly added to the silicon dioxide wet material being stirred, and the binder is sprayed at the same time, so that the molybdenum disulfide, the hexagonal boron nitride and the natural graphite are bonded to the silicon dioxide wet material to obtain lubricant wet particles;

[0016] The lubricant wet particles are dried to obtain lubricant particles.

[0017] The present application first moisturizes the silicon dioxide, and then the molybdenum disulfide, the hexagonal boron nitride and the natural graphite are attached to the surface of the silicon dioxide through the binder and dried to form the lubricant particles. The lubricant particles of the present application can solve the problem of weakening and hindering the combination of the solid lubricant and the metal binder carcass.

[0018] In some embodiments, the amount of water added is 30 ml per 1 kg of silicon dioxide. The present invention reasonably controls the amount of water added to ensure sufficient wetting of the silicon dioxide.

[0019] In some embodiments, the rotation speed of the stirring container is 20 rpm to 60 rpm. The present invention reasonably controls the rotation speed of the stirring container so that the silicon dioxide can be evenly coated with natural graphite, molybdenum disulfide and hexagonal boron nitride to form lubricant particles with a stable and firm structure.

[0020] In some embodiments, the drying temperature is 70° C. to 150° C., and the drying time is 0.5 h to 1.5 h. The present invention reasonably controls the drying temperature and time so that the lubricant particles have sufficient compressive strength.

[0021] By adopting the above technical solution, the beneficial effects of the present invention are:

[0022] The present invention mainly uses silicon dioxide and supplements it with natural graphite, molybdenum disulfide and hexagonal boron nitride. A binder is used to evenly adhere the natural graphite, molybdenum disulfide and hexagonal boron nitride to the surface of the silicon dioxide, so that the solid lubricant is formed in the form of particles, which greatly enhances the sustained release effect of the solid lubricant and also greatly improves the compressive strength of the solid lubricant.

[0023] The lubricant particles of the present invention can replace existing powdered solid lubricants and have a single-particle compressive strength of over 50N. They maintain a fixed shape and occupy a certain space during sintering when added to a metal binder. When the metal binder wears down to the lubricant particles, the lubricant particles are slowly released onto the grinding surface, providing a lubricating effect. Furthermore, the lubricant particles' binding strength to the metal binder increases by over 10% compared to the lubricant powder's strength.

[0024] The present invention first wets silicon dioxide, then adheres molybdenum disulfide, hexagonal boron nitride, and natural graphite to the surface of the silicon dioxide via a binder and dries the resulting lubricant particles. The lubricant particles of the present invention can address the problem of solid lubricants weakening and hindering the metal binder matrix.

[0025] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention.

[0026] Undoubtedly, these and other objects of the present invention will become more apparent after the following detailed description of the preferred embodiment is described with reference to the various figures and drawings.

[0027] In order to make the above and other objects, features and advantages of the present invention more obvious and easy to understand, one or more preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are used to provide further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention but do not constitute a limitation of the present invention.

[0029] In the drawings, like components are given like reference numerals, and the drawings are schematic and not necessarily drawn to scale.

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only one or several embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on such drawings without paying any creative work.

[0031] Figure 1 The present invention is a flow chart for preparing lubricant particles. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but are not intended to limit the present invention.

[0033] In addition, in the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the present invention, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, removable connections, or integration; they may refer to direct connections or indirect connections through an intermediate medium; they may refer to internal communication between two components or interactions between two components. However, the term "direct connection" indicates that the two connected entities are not connected through a transitional structure, but are connected solely through a connecting structure to form a single entity. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0036] According to some embodiments of the present invention, the present invention provides a lubricant particle. The lubricant particle includes a solid lubricant and a binder, wherein the solid lubricant includes natural graphite, molybdenum disulfide, hexagonal boron nitride, and silicon dioxide;

[0037] Based on the total mass of the solid lubricant, the mass content of the natural graphite is 5% to 20%, the mass content of the molybdenum disulfide is 5% to 20%, the mass content of the hexagonal boron nitride is 5% to 20%, and the mass content of the silicon dioxide is 40% to 85%.

[0038] The present invention mainly uses silicon dioxide and supplements it with natural graphite, molybdenum disulfide and hexagonal boron nitride. A binder is used to evenly adhere the natural graphite, molybdenum disulfide and hexagonal boron nitride to the surface of the silicon dioxide, so that the solid lubricant is formed in the form of particles, which greatly enhances the sustained release effect of the solid lubricant and also greatly improves the compressive strength of the solid lubricant.

[0039] Optionally, the mass content of the natural graphite is 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or its value is within the range obtained by combining any two of the above values.

[0040] Optionally, the mass content of molybdenum disulfide is 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or its value is within the range obtained by combining any two of the above values.

[0041] Optionally, the mass content of the hexagonal boron nitride is 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, or its value is within the range obtained by combining any two of the above values.

[0042] Optionally, the mass content of the silicon dioxide is 40%, 42%, 44%, 46%, 48%, 50%, 52%, 54%, 56%, 58%, 60%, 62%, 64%, 66%, 68%, 70%, 72%, 74%, 76%, 78%, 80%, 82%, 84%, 85%, or its value is within the range obtained by combining any two of the above values.

[0043] According to some embodiments of the present invention, optionally, the binder is silica sol and / or aluminum dihydrogen phosphate. The present invention uses silica sol or aluminum dihydrogen phosphate as a binder to make the structure of the lubricant particles more stable and firm.

[0044] According to some embodiments of the present invention, the silica sol content is optionally 0% to 80% by mass, and the aluminum dihydrogen phosphate content is optionally 20% to 100% by mass, based on the total mass of the binder. The present invention utilizes silica sol and aluminum dihydrogen phosphate as binders, and through a reasonable proportioning, the binder provides a significant adhesion effect within the lubricant, thereby ensuring a stable and robust lubricant particle structure.

[0045] Optionally, the mass content of the silica sol is 0%, 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%, or its value is within the range obtained by combining any two of the above values.

[0046] Optionally, the mass content of the aluminum dihydrogen phosphate is 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 100%, or its value is within the range obtained by combining any two of the above values.

[0047] According to some embodiments of the present invention, the binder may be present in an amount of 10% to 30% by mass of the solid lubricant. The present invention ensures a stable and firm lubricant particle structure by rationally preparing the ratio between the binder and the solid lubricant.

[0048] Optionally, the mass content of the binder is 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30% of the mass content of the solid lubricant, or its value is within the range obtained by combining any two of the above values.

[0049] According to some embodiments of the present invention, optionally, the particle size of the natural graphite is 150-250 mesh, the particle size of the molybdenum disulfide is 150-250 mesh, the particle size of the hexagonal boron nitride is 150-250 mesh, and the particle size of the silicon dioxide is 150-250 mesh. The present invention controls the particle sizes of silicon dioxide, natural graphite, molybdenum disulfide, and hexagonal boron nitride, thereby allowing the natural graphite, molybdenum disulfide, and hexagonal boron nitride to firmly adhere to the surface of the silicon dioxide.

[0050] Optionally, the particle size of the natural graphite is 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, 250 mesh, or its value is within the range obtained by combining any two of the above values.

[0051] Optionally, the particle size of the molybdenum disulfide is 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, 250 mesh, or its value is within the range obtained by combining any two of the above values.

[0052] Optionally, the particle size of the hexagonal boron nitride is 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, 250 mesh, or its value is within the range obtained by combining any two of the above values.

[0053] Optionally, the particle size of the silicon dioxide is 150 mesh, 160 mesh, 170 mesh, 180 mesh, 190 mesh, 200 mesh, 210 mesh, 220 mesh, 230 mesh, 240 mesh, 250 mesh, or its value is within the range obtained by combining any two of the above values.

[0054] According to some embodiments of the present invention, optionally, the compressive strength of the lubricant particles is ≥50 N. The compressive strength of the lubricant particles of the present invention is above 50 N, and they will not be dispersed in the matrix to hinder the combination of metal elements.

[0055] According to some embodiments of the present invention, the present invention also provides a method for preparing lubricant particles. The preparation method comprises the following steps:

[0056] Putting silicon dioxide into a container and stirring it, while adding water and stirring it, to obtain a silicon dioxide wet material;

[0057] adding molybdenum disulfide, hexagonal boron nitride and natural graphite to the stirred silicon dioxide wet material at a uniform speed, and spraying a binder at the same time, so that the molybdenum disulfide, hexagonal boron nitride and natural graphite are bonded to the silicon dioxide wet material, to obtain lubricant wet particles;

[0058] The lubricant wet granules are dried to obtain lubricant granules.

[0059] The present invention first wets silicon dioxide, then adheres molybdenum disulfide, hexagonal boron nitride, and natural graphite to the surface of the silicon dioxide via a binder and dries the resulting lubricant particles. The lubricant particles of the present invention can address the problem of solid lubricants weakening and hindering the metal binder matrix.

[0060] According to some embodiments of the present invention, optionally, the amount of water added is 30 ml per 1 kg of silicon dioxide. The present invention reasonably controls the amount of water added to ensure sufficient wetting of the silicon dioxide.

[0061] According to some embodiments of the present invention, the rotation speed of the stirring container is optionally 20 rpm to 60 rpm. By properly controlling the rotation speed of the stirring container, the present invention allows the silicon dioxide to be evenly coated with natural graphite, molybdenum disulfide, and hexagonal boron nitride to form lubricant particles with a stable and strong structure.

[0062] Optionally, the rotational speed of the stirring container is 20 rpm, 25 rpm, 30 rpm, 35 rpm, 40 rpm, 45 rpm, 50 rpm, 55 rpm, 60 rpm, or a value within the range obtained by combining any two of the above values.

[0063] According to some embodiments of the present invention, optionally, the drying temperature is 70° C. to 150° C., and the drying time is 0.5 h to 1.5 h. The present invention reasonably controls the drying temperature and time so that the lubricant particles have sufficient compressive strength.

[0064] Optionally, the drying temperature is 70°C, 75°C, 80°C, 85°C, 90°C, 95°C, 100°C, 105°C, 110°C, 115°C, 120°C, 125°C, 130°C, 135°C, 140°C, 145°C, 150°C, or its value is within the range obtained by combining any two of the above values.

[0065] Optionally, the drying time is 0.5h, 0.6h, 0.7h, 0.8h, 0.9h, 1.0h, 1.1h, 1.2h, 1.3h, 1.4h, 1.5h, or its value is within the range obtained by combining any two of the above values.

[0066] Example 1

[0067] This embodiment provides a lubricant particle. The lubricant particle includes a solid lubricant and a binder, wherein the solid lubricant includes natural graphite, molybdenum disulfide, hexagonal boron nitride, and silicon dioxide; and the binder is silica sol.

[0068] Based on the total mass of the solid lubricant, the mass content of the natural graphite is 5%, the mass content of the molybdenum disulfide is 5%, the mass content of the hexagonal boron nitride is 5%, and the mass content of the silicon dioxide is 85%.

[0069] in,

[0070] The particle size of the natural graphite is 150 mesh, the particle size of the molybdenum disulfide is 150 mesh, the particle size of the hexagonal boron nitride is 150 mesh, and the particle size of the silicon dioxide is 250 mesh;

[0071] The compressive strength of the lubricant particles is ≥50N.

[0072] This embodiment also provides a method for preparing lubricant particles. The preparation method comprises the following steps:

[0073] Putting silicon dioxide into a container and stirring it, while adding water and stirring it, to obtain a silicon dioxide wet material;

[0074] adding molybdenum disulfide, hexagonal boron nitride and natural graphite to the stirred silicon dioxide wet material at a uniform speed, and spraying a binder at the same time, so that the molybdenum disulfide, hexagonal boron nitride and natural graphite are bonded to the silicon dioxide wet material, to obtain lubricant wet particles;

[0075] The wet lubricant granules were dried (drying temperature: 70° C., drying time: 1.5 h) to obtain lubricant granules.

[0076] The amount of water added was 30 ml per 1 kg of silicon dioxide, and the rotation speed of the stirring container was 20 rpm.

[0077] Example 2

[0078] This embodiment provides a lubricant particle comprising a solid lubricant and a binder, wherein the solid lubricant comprises natural graphite, molybdenum disulfide, hexagonal boron nitride, and silicon dioxide; and the binder comprises silica sol and aluminum dihydrogen phosphate.

[0079] Based on the total mass of the solid lubricant, the mass content of the natural graphite is 12.5%, the mass content of the molybdenum disulfide is 12.5%, the mass content of the hexagonal boron nitride is 12.5%, and the mass content of the silicon dioxide is 62.5%.

[0080] Based on the total mass of the binder, the mass content of the silica sol is 40%, and the mass content of the aluminum dihydrogen phosphate is 60%.

[0081] in,

[0082] The particle size of the natural graphite is 100 mesh, the particle size of the molybdenum disulfide is 100 mesh, the particle size of the hexagonal boron nitride is 100 mesh, and the particle size of the silicon dioxide is 100 mesh;

[0083] The compressive strength of the lubricant particles is ≥50N.

[0084] This embodiment also provides a method for preparing lubricant particles. The preparation method comprises the following steps:

[0085] Putting silicon dioxide into a container and stirring it, while adding water and stirring it, to obtain a silicon dioxide wet material;

[0086] adding molybdenum disulfide, hexagonal boron nitride and natural graphite to the stirred silicon dioxide wet material at a uniform speed, and spraying a binder at the same time, so that the molybdenum disulfide, hexagonal boron nitride and natural graphite are bonded to the silicon dioxide wet material, to obtain lubricant wet particles;

[0087] The wet lubricant granules were dried (drying temperature: 110° C., drying time: 1 h) to obtain lubricant granules.

[0088] The amount of water added was 30 ml per 1 kg of silicon dioxide, and the rotation speed of the stirring container was 40 rpm.

[0089] Example 3

[0090] This embodiment provides a lubricant particle comprising a solid lubricant and a binder, wherein the solid lubricant comprises natural graphite, molybdenum disulfide, hexagonal boron nitride, and silicon dioxide; and the binder comprises silica sol and aluminum dihydrogen phosphate.

[0091] Based on the total mass of the solid lubricant, the mass content of the natural graphite is 20%, the mass content of the molybdenum disulfide is 20%, the mass content of the hexagonal boron nitride is 20%, and the mass content of the silicon dioxide is 40%.

[0092] The mass content of the silica sol is 60% and the mass content of the aluminum dihydrogen phosphate is 40% based on the total mass of the binder.

[0093] wherein,

[0094] The particle size of the natural graphite is 250 mesh, the particle size of the molybdenum disulfide is 250 mesh, the particle size of the hexagonal boron nitride is 250 mesh, and the particle size of the silicon dioxide is 250 mesh.

[0095] The compressive strength of the lubricant particles is greater than or equal to 50 N.

[0096] The present embodiment also provides a preparation method of the lubricant particles. The preparation method comprises the following steps:

[0097] The silicon dioxide is placed in a container for stirring, and water is added for stirring at the same time to obtain silicon dioxide wet material;

[0098] The molybdenum disulfide, the hexagonal boron nitride, and the natural graphite are uniformly added into the silicon dioxide wet material being stirred, and the binder is sprayed at the same time to bond the molybdenum disulfide, the hexagonal boron nitride, and the natural graphite to the silicon dioxide wet material, thereby obtaining lubricant wet particles.

[0099] The lubricant wet particles are dried (the drying temperature is 150°C, and the drying time is 0.5h) to obtain the lubricant particles.

[0100] The water is added in an amount of 30ml per 1kg of silicon dioxide, and the stirring container is rotated at a speed of 60rpm.

[0101] It should be understood that the embodiments disclosed herein are not limited to the specific processing steps or materials disclosed herein, but extend to equivalent alternatives of such features as understood by those skilled in the relevant art. It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting.

[0102] Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment.

[0103] Furthermore, the described features or characteristics can be combined in any other suitable manner in one or more embodiments. In the above description, specific details of particular embodiments are provided to provide a thorough understanding of embodiments of the application. However, one skilled in the relevant art will understand that the application can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. An application of lubricant particles in a metal binder mold, characterized in that: The lubricant particles include a solid lubricant and a binder, wherein the solid lubricant is natural graphite, molybdenum disulfide, hexagonal boron nitride and silicon dioxide; Based on the total mass of the solid lubricant, the mass content of the natural graphite is 5% to 20%, the mass content of the molybdenum disulfide is 5% to 20%, the mass content of the hexagonal boron nitride is 5% to 20%, and the mass content of the silicon dioxide is 40% to 85%; The compressive strength of the lubricant particles is ≥50N; The preparation method of the lubricant particles is: Putting silicon dioxide into a container and stirring it, while adding water and stirring it, to obtain a silicon dioxide wet material; adding molybdenum disulfide, hexagonal boron nitride and natural graphite to the stirred silicon dioxide wet material at a uniform speed, and spraying a binder at the same time, so that the molybdenum disulfide, hexagonal boron nitride and natural graphite are bonded to the silicon dioxide wet material, to obtain lubricant wet particles; The wet lubricant particles are dried to obtain lubricant particles; wherein the drying temperature is 70° C. to 150° C., and the drying time is 0.5 h to 1.5 h.

2. The use of lubricant particles in a metal bond mold according to claim 1, characterized in that: The binder is silica sol and / or aluminum dihydrogen phosphate.

3. The use of lubricant particles in a metal bond mold according to claim 2, characterized in that: Based on the total mass of the binder, the mass content of the silica sol is 0% to 80%, and the mass content of the aluminum dihydrogen phosphate is 20% to 100%.

4. The use of lubricant particles in a metal bond mold according to claim 1, characterized in that: The mass content of the binder is 10% to 30% of the mass content of the solid lubricant.

5. The use of lubricant particles in a metal bond mold according to claim 1, characterized in that: The particle size of the natural graphite is 150 mesh to 250 mesh, the particle size of the molybdenum disulfide is 150 mesh to 250 mesh, the particle size of the hexagonal boron nitride is 150 mesh to 250 mesh, and the particle size of the silicon dioxide is 150 mesh to 250 mesh.

6. The use of lubricant particles in a metal bond mold according to claim 1, characterized in that: The amount of water added was 30 mL per 1 kg of silica.

7. The use of lubricant particles in a metal bond mold according to claim 1, characterized in that: The rotation speed of the stirring container is 20rpm~60rpm.

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