Device for coating surfaces of diamond particles with metal powder and powder coating method

Abstract

The invention discloses a device for coating the surfaces of diamond particles with metal powder and a powder coating method.The device comprises a coating machine and a spraying device, the coating machine is provided with a coating machine rotating disc, the coating machine rotating disc is used for stirring the diamond particles and connected with a rotating power device, the spraying device is arranged on one side of the coating machine rotating disc, and the spraying device is connected with the coating machine rotating disc. A spraying nozzle of the spraying device is located above the coating machine rotary table, a baffle is arranged above the bottom of the coating machine rotary table, the baffle does not make contact with the coating machine rotary table, and diamond particles are evenly distributed on the bottom face of the coating machine rotary table through the baffle. The technical problems that in the prior art, the surface powder coating thickness is not uniform, multi-core diamond particles are coated, the powder-coated diamond particles and metal powder particles are mixed and are difficult to distinguish, diamond segregation is caused in the sintering process, materials are not uniform, and the mechanical strength is reduced are solved.

Description

Technical Field

[0001] The invention belongs to the technical field of metal smelting, and in particular relates to a device for coating metal powder on the surface of diamond particles and a powder coating method. Background Art

[0002] In the preparation of diamond / metal matrix composite materials by powder sintering, in order to make the diamond particles surrounded by molten metal during the high-temperature sintering process and avoid the accumulation of diamonds and the resulting material segregation, metal powder is usually coated on the outside of the diamond. There are generally two existing technologies: powder coating by grinding and powder coating by shot blasting.

[0003] Grinding method for powder coating: A planetary ball mill is used to add adhesive, diamond particles and metal powder into the grinding equipment. Under the two forces of the equipment's rotation and centrifugal revolution, the three elements rub and collide with each other, and the metal powder adheres to the surface of the diamond particles.

[0004] Shot blasting powder coating: Use a shot blasting machine to add adhesive, diamond particles and metal powder into the shot blasting machine, and throw the diamond through the equipment. The diamond will be sprayed with adhesive during the falling process, and then fall into the metal powder, so that the surface of the diamond particles is covered with a layer of metal powder. This process is repeated until the thickness of the metal powder on the surface of the diamond meets the standard.

[0005] However, both of the above methods have some defects: The disadvantages of powder coating by grinding are as follows: a) There is centrifugal force in the whole grinding process, and the thickness of the powder coating on the diamond surface will vary; b) The metal powder forms particles during rolling and mixes with the powder-coated diamond particles, making it difficult to separate them when taking them out; The disadvantages of shot blasting powder coating are as follows: a) The diamond particles lack sufficient self-rotation and rolling during the powder coating process, and the thickness of the powder coating on the diamond surface will be uneven; b) When diamond particles are thrown and dropped, the sprayed adhesive makes the diamonds bond together to form "multi-core" diamonds covered by metal powder.

[0006] The main problems with the traditional diamond surface powder coating method are: uneven surface powder coating thickness, the appearance of "multi-core" diamond particles being coated, and the problem that the coated diamond particles and metal powder particles are mixed and difficult to distinguish. The above problems will cause diamond segregation during the sintering process, resulting in uneven material and reduced mechanical strength. Summary of the invention

[0007] The purpose of the present invention is to provide a device and a powder coating method for coating metal powder on the surface of diamond particles, so as to solve the technical problems of uneven surface powder coating thickness, "multi-core" diamond particles being coated, and the coated diamond particles and metal powder particles being mixed and difficult to distinguish, resulting in diamond segregation during sintering, resulting in material unevenness and reduced mechanical strength.

[0008] The technical solution adopted by the present invention to solve its technical problem is: A device for coating metal powder on the surface of diamond particles comprises: a coating machine and a spray device, wherein the coating machine has a coating machine turntable, the coating machine turntable is used for stirring the diamond particles, the coating machine turntable is connected to a rotary power device, a spray device is arranged on one side of the coating machine turntable, the spray nozzle of the spray device is located above the coating machine turntable, a baffle is arranged above the bottom of the coating machine turntable, the baffle does not contact the coating machine turntable, and the baffle makes the diamond particles evenly distributed on the bottom surface of the coating machine turntable.

[0009] The present invention discloses a device for coating metal powder on the surface of diamond particles. The bottom surface of the coating machine turntable is provided with a plurality of ventilation holes, and warm air can be introduced into the ventilation holes.

[0010] A method for coating the surface of diamond particles with metal powder, characterized in that it comprises the following steps: S1. Prepare adhesive and put it into the spray device; S2, placing diamond particles into the coating machine turntable and starting the rotation, and turning on the spray device to spray the adhesive through the spray nozzle; S3, adding metal powder to the coating machine turntable; S4, continue spraying the adhesive and add metal powder again; S5. Repeat step S4 several times until the thickness of the metal powder coated on the outside of the diamond particles reaches the required thickness.

[0011] The present invention provides a method for coating the surface of diamond particles with metal powder. In step s1, the adhesive is prepared with nitrile rubber as solute and acetone solution as solution, and the concentration of the nitrile rubber is 1%-3%.

[0012] In the method for coating the surface of diamond particles with metal powder of the present invention, the flow rate of the spray nozzle during spraying is 15-25 ml / min.

[0013] In the method for coating the surface of diamond particles with metal powder of the present invention, in steps s2 and s4, baffles are used to evenly distribute the diamond particles.

[0014] In the method for coating the surface of diamond particles with metal powder, the baffle is operated by hand.

[0015] The beneficial effects of the present invention are as follows: a device for coating metal powder on the surface of diamond particles and a powder coating method are proposed, wherein the diamond particles are rotated by the rotation of the coating machine turntable, and the baffle repeatedly blocks the self-rotation and rolling caused by the movement, so that the thickness of the metal powder coated on the surface can be uniform, and because the baffle repeatedly blocks the movement of the particles, the "core" particles will be preferentially enlarged, and the "core" particles and the "coreless" particles are clearly distinguished in terms of volume size. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 is a schematic diagram of an embodiment of the present invention; Figure 2 2 is a top view of an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] like Figure 1-2 As shown, a device for coating metal powder on the surface of diamond particles comprises: a coating machine and a spray device 2, wherein the coating machine has a coating machine turntable 1, the coating machine turntable 1 is used for stirring diamond particles 4, the coating machine turntable 1 is connected to a rotary power device, a spray device 2 is arranged on one side of the coating machine turntable 1, a spray nozzle 21 of the spray device 2 is located above the coating machine turntable 1, a baffle 3 is arranged above the bottom of the coating machine turntable 1, the baffle 3 does not contact the coating machine turntable 1, and the baffle 3 makes the diamond particles 4 evenly distributed on the bottom surface of the coating machine turntable 1.

[0019] As a preferred embodiment, the bottom surface of the coating machine turntable 1 has a plurality of ventilation holes 11, and warm air can be introduced into the ventilation holes 11.

[0020] A powder coating method for a device for coating metal powder on the surface of diamond particles comprises the following steps: S1, prepare adhesive and load it into spray device 2; S2, placing the diamond particles 4 into the coating machine turntable 1 and starting the rotation, and turning on the spray device 2 so that the spray nozzle 21 sprays the adhesive; S3, adding metal powder to the coating machine turntable 1; S4, continue spraying the adhesive and add metal powder again; S5, repeat step S4 several times until the thickness of the metal powder coated on the outside of the diamond particles 4 reaches the required thickness.

[0021] As a preferred embodiment, in the step s1, the adhesive is prepared with nitrile rubber as the solute and acetone solution as the solution, and the concentration of the nitrile rubber is 1%-3%.

[0022] As a preferred embodiment, the flow rate of the spray nozzle 21 during spraying is 15-25 ml / min.

[0023] As a preferred embodiment, in steps s2 and s4, a baffle 3 is used to evenly distribute the diamond particles 4.

[0024] As a preferred embodiment, the baffle 3 is manually operated by hand, and blocks the rotation path of the diamond particles 4 from the side, so that the particles are dispersed during the operation, and the diamond particles are prevented from accumulating on the side wall of the coating machine and being relatively still due to the centripetal force.

[0025] The baffle 3 is used to block the side of the rotation path of the diamond particles 4 so that the particles are dispersed during the operation, and metal powder is adhered to the surface of the particles during this process. The baffle 3 is used multiple times to disperse the diamond particles 4 to prevent multiple diamond particles 4 from being wrapped together at the same time. The diamond particles 4 rotate and rotate on their own in the coating machine turntable 1, so that the thickness of the metal powder adhered to the surface can be rolled to be relatively uniform.

[0026] It should be noted that, in the embodiment, the diamond particles 4 are generally artificial diamond particles with a particle size of about 1 mm, and the metal powder uses a matrix alloy powder, commonly Ni55 alloy powder (average particle size of about 10 um) and YG alloy powder (average particle size of about 5 um).

[0027] The adhesive is: use nitrile rubber (5g-10g) + 300ml-500ml acetone solution with a concentration of 99%, analytical grade, put in a magnetic stirrer, place the above solution on the magnetic stirrer, and continue stirring until the nitrile rubber is completely dissolved in the acetone solution. To ensure the homogeneity of the solution, magnetic stirring needs to be continued throughout the use process. 4. Acetone is volatile, and the remaining nitrile rubber will stick the powder to the surface of the diamond particles more stably. Shot blasting machine model: WL centrifugal granulation coating machine At the same time, during the powder coating process, when hot air at 30° is introduced into the ventilation holes 11, the acetone in the adhesive evaporates rapidly, the solution solidifies, and the powder is firmly coated on the surface of the diamond particles.

[0028] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying 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 limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0030] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

Claims

1. A device for coating the surface of diamond particles with metal powder, characterized in that: include: A coating machine and a spray device (2), wherein the coating machine comprises a coating machine turntable (1), the coating machine turntable (1) being used for stirring diamond particles (4), the coating machine turntable (1) being connected to a rotary power device, a spray device (2) being arranged on one side of the coating machine turntable (1), a spray nozzle (21) of the spray device (2) being located above the coating machine turntable (1), a baffle (3) being arranged above the bottom of the coating machine turntable (1), the baffle (3) not being in contact with the coating machine turntable (1), the baffle (3) making the diamond particles (4) evenly distributed on the bottom surface of the coating machine turntable (1).

2. The device for coating the surface of diamond particles with metal powder according to claim 1, characterized in that: The bottom surface of the coating machine turntable (1) is provided with a plurality of ventilation holes (11), and warm air can be introduced into the ventilation holes (11).

3. A powder coating method using the device for coating metal powder on the surface of diamond particles according to claim 2, characterized in that: The following steps are involved: S1, preparing an adhesive and loading it into a spray device (2); S2, placing the diamond particles (4) into the coating machine turntable (1) and starting the rotation, and turning on the spray device (2) so that the spray nozzle (21) sprays the adhesive; S3, adding metal powder to the coating machine turntable (1); S4, continue spraying the adhesive and add metal powder again; S5, repeat step S4 several times until the thickness of the metal powder coating the diamond particles (4) reaches the required thickness.

4. The method for coating the surface of diamond particles with metal powder according to claim 3, characterized in that: In the step s1, the adhesive is prepared with nitrile rubber as solute and acetone solution as solution, and the concentration of the nitrile rubber is 1%-3%.

5. The method for coating the surface of diamond particles with metal powder according to claim 4, characterized in that: The flow rate of the spray nozzle (21) during spraying is 15-25 ml / min.

6. The method for coating the surface of diamond particles with metal powder according to claim 3, characterized in that: In the steps s2 and s4, a baffle (3) is used to evenly distribute the diamond particles (4).

7. The method for coating the surface of diamond particles with metal powder according to claim 4, characterized in that: The baffle (3) is manually operated by hand.

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