CN114012089A - Preparation method and generation device of diamond coated ball - Google Patents
Preparation method and generation device of diamond coated ball Download PDFInfo
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- CN114012089A CN114012089A CN202011123917.2A CN202011123917A CN114012089A CN 114012089 A CN114012089 A CN 114012089A CN 202011123917 A CN202011123917 A CN 202011123917A CN 114012089 A CN114012089 A CN 114012089A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1017—Multiple heating or additional steps
- B22F3/1021—Removal of binder or filler
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C26/00—Alloys containing diamond or cubic or wurtzitic boron nitride, fullerenes or carbon nanotubes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/04—Alloys containing less than 50% by weight of each constituent containing tin or lead
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- C22C38/00—Ferrous alloys, e.g. steel alloys
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/10—Ferrous alloys, e.g. steel alloys containing cobalt
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/16—Ferrous alloys, e.g. steel alloys containing copper
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Abstract
The invention relates to a preparation method and a generation device of a diamond coated ball. The method comprises the steps of sucking diamonds by using a diamond adsorption probe with vacuum negative pressure, extending the diamonds into the center of a wrapping ball cavity, closing the wrapping ball cavity, extruding metal powder mixed slurry from openings at two sides of the wrapping ball cavity by a metal powder slurry extruding device until the whole cavity is filled, withdrawing the adsorption probe, and separating the cavity to form the diamond wrapping ball. The generating device comprises a metal powder slurry extruding device, a wrapping ball cavity, a vacuum negative pressure device, a diamond adsorption probe and a diamond. The diamond prepared by the generating device of the invention has consistent degree of coating spherulites, forms diamond-like arrangement with uniform distribution, and the inside of a matrix formed by the diamond-metal powder layer can effectively avoid diamond agglomeration or segregation, thereby improving the performance of the diamond-metal composite material.
Description
Technical Field
The invention belongs to the research field of diamond-metal matrix composite materials, and particularly relates to a preparation method and a generation device of a diamond coated ball.
Background
The conventional diamond tool cutting, drilling and grinding product or diamond functional material product is prepared by mixing and sintering diamond and metal powder, wherein the diamond is randomly distributed in a metal powder matrix or the diamond is randomly mixed in the metal powder matrix. Because the difference of the granularity and the specific gravity of the diamond and the metal matrix powder is very large, the diamond is difficult to be uniformly mixed in the metal matrix powder, and the randomly distributed diamond is easy to agglomerate and segregate, so that the performance of a diamond product is greatly influenced, and the diamond tool for cutting, drilling and grinding has low drilling efficiency, short service life and instability; and the performance of the diamond functional material product such as photo-electricity and heat is low. In order to prevent diamond segregation in metal matrix powder, zinc stearate, liquid paraffin or absolute ethyl alcohol and the like are added during mixing, but the problem of uneven distribution of diamond in the metal matrix powder cannot be fundamentally solved.
In view of the above problems, korean new korean corporation 2004 invented the ARIX technology, i.e., a method of preparing a diamond ordering tool by pressing a hole in a metal powder cold compact by an apparatus pointer and then dropping the diamond, with great success. Patents US4770907A, US5143523A and US5405573A describe the use of a fluidized bed to coat particles. EP0012631a1 describes a method for coating particles such as diamond by means of a rotating disc. The combination of the two coating techniques of "fluidization" and "spinning disk" described in US20120082786a1 achieves uniform coating of the superhard particles in a single apparatus as described, with great improvements in coating efficiency and cost reduction, but the method requires constant inspection of the coating conditions during the coating process.
The 'fluidization method' and the 'rotating disc method' are both rolling ball processes, and although the phenomena of agglomeration, segregation and the like of diamond can be avoided, the particle size of the obtained diamond-coated ball has certain deviation and cannot be completely and uniformly distributed. The ARIX technology of new and korean corporation is that diamonds are orderly arranged in advance, and the design is deviated due to slippage of diamonds caused by problems such as uneven pressure or density of a metal matrix during sintering, which may cause the degradation of the performance of diamond tools or products.
Disclosure of Invention
Aiming at the problems, the invention provides an advanced preparation method of a diamond-metal powder composite material, and particularly relates to a preparation method and a generation device of a diamond coated ball. The diamond coated ball prepared by the invention is characterized in that the metal powder layer is attached to the surface of a bare diamond and serves as a matrix material, other metal powder is not added during final sintering, namely the metal powder layer on the surface is the matrix bonding material of the diamond tool, the process can prevent phenomena such as diamond segregation and agglomeration in the matrix, and the diamonds are basically uniformly distributed in the matrix. The preparation method comprises the following steps:
under the action of the vacuum negative pressure device 4, wherein the suction force in the negative pressure process is 5-8N, the diamond adsorption probe 5 absorbs the diamond 6 and extends into the central position of the wrapped ball cavity 3, and the wrapped ball cavity is closed. The metal powder mixed slurry is extruded from the openings at two sides of the coating ball cavity 3 through the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2 until the whole cavity is filled, then the diamond adsorption probe 5 is withdrawn from the coating ball cavity 3, and at the moment, the diamond and the metal powder layer inside the coating ball cavity 3 form a diamond coating ball. The ball-wrapping cavity 3 is opened and the diamond-wrapped ball is formed and dropped into the container. And putting the diamond coated ball into a heat treatment furnace for dewaxing treatment to remove the organic binder completely. The dewaxed diamond-coated ball is directly put into a graphite die or a steel die for sintering without adding other metal powder.
The diamond grain size in the above step is 75-1180 μm, preferably, the diamond grain size is 150 μm, 600 μm and 1000 μm; the volume fraction of the diamond is 5-50%, and the volume fraction is determined according to the proportion of the diamond in the diamond and the metal powder layer; wherein when the grain diameter of the diamond is 150 μm, the volume fraction of the diamond is 5%; when the grain diameter of the diamond is 600 mu m, the volume fraction of the diamond is 20 percent; when the diamond grain size is 1000 μm, the volume fraction of diamond is 40%.
The metal powder layer is formed by mixing a plurality of kinds of metal powder, and comprises Fe, Co, Cu and Sn, and further comprises Ni, Mn or W. The mass ratio of the various metal powder components is Fe to Co to Cu to Sn is 40 to 20 to 35 to 5.
The dewaxing temperature in the dewaxing process is 300-550 ℃, the heat preservation time is 3-4h, preferably, the dewaxing temperature is 450 ℃, and the heat preservation time is 4 h. Sintering the dewaxed diamond-coated ball in a graphite mold or a steel mold at 850-950 ℃ for 3-5min, preferably at 890 ℃ for 3 min.
Meanwhile, in order to prepare the metal powder layer into viscous paste-shaped slurry with certain fluidity, the invention also uses an organic binder, wherein the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol, and the proportion of the polyformaldehyde, the polypropylene and the ethylene glycol is 10:70:30, and the organic binder is calculated according to volume fraction. The metal powder layer and the organic binder are mixed and stirred to prepare viscous paste-shaped metal powder mixed slurry, and then the viscous paste-shaped metal powder mixed slurry is placed into the first metal powder slurry extrusion device 1 and the second metal powder slurry extrusion device 2.
The diamond coated ball prepared by the preparation method of the diamond coated ball consists of diamond and a metal powder layer coated on the surface of the diamond. Meanwhile, the invention also provides a device for generating the diamond-coated ball, which comprises a first metal powder slurry extrusion device 1, a second metal powder slurry extrusion device 2, a coated ball cavity 3, a vacuum negative pressure device 4, a diamond adsorption probe 5 and a diamond 6, wherein the coated ball cavity 3 is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extrusion device 1 and the second metal powder slurry extrusion device 2; the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe 5; the upper end of the diamond adsorption probe 5 is connected with the wrapping ball cavity 3, the probe can extend into the center of the inner part of the cavity, and the lower end of the probe is connected with the vacuum negative pressure device 4, so that the diamond 6 is adsorbed on the diamond adsorption probe 5.
Compared with the prior art, the invention has the beneficial effects that:
1) the diamond coated balls prepared by the generating device have consistent diamond coated ball granularity, form uniformly distributed diamond-like arrangement, and can realize uniform distribution of diamonds in the metal powder layer.
2) The coating ball cavities with different diameters can be designed according to actual needs, and the preparation of diamond coating balls with various different particle sizes is realized.
3) The preparation process of the diamond coated ball has high efficiency and can realize large-scale production.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 shows the device for generating the diamond-coated ball, 1-a first metal powder slurry extrusion device, 2-a second metal powder slurry extrusion device, 3-a coated ball cavity, 4-a vacuum negative pressure device, 5-a diamond adsorption probe, and 6-diamond.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
In the embodiment of the invention, the diamond coated ball is prepared by selecting the metal powder layer and the diamond with the grain diameter of 150 mu m. The metal powder layer is formed by mixing a plurality of metal powders including Fe, Co, Cu and Sn.
In the embodiment, the mass ratio of the various metal powder components is Fe: Co: Cu: Sn: 40:20:35:5, and the volume fraction of diamond is 5%, so that the diameter of the cavity of the wrapped ball can be designed to be 407 μm.
Referring to fig. 1, the diamond-coated ball generating device includes a first metal powder slurry extruding device 1, a second metal powder slurry extruding device 2, a coated ball cavity 3, a vacuum negative pressure device 4, a diamond adsorption probe 5 and a diamond 6, wherein the coated ball cavity 3 is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2; the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe 5; the upper end of the diamond adsorption probe 5 is connected with the wrapping ball cavity 3, the probe can extend into the center of the inner part of the cavity, and the lower end of the probe is connected with the vacuum negative pressure device 4, so that the diamond 6 is adsorbed on the diamond adsorption probe 5.
In order to prepare the metal powder into viscous paste-shaped slurry with certain fluidity, an organic binder is used in the embodiment of the invention, and the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol, wherein the ratio of the polyformaldehyde to the polypropylene to the ethylene glycol is 10:70:30 (volume fraction). Metal powder and an organic binder are mixed and stirred to prepare thick paste slurry, and then the thick paste slurry is placed into a first metal powder slurry extrusion device 1 and a second metal powder slurry extrusion device 2.
Under the action of the vacuum negative pressure device 4, wherein the suction force in the negative pressure process is 6N, the diamond adsorption probe 5 absorbs the diamond 6 and extends into the central position of the wrapped ball cavity 3, and the wrapped ball cavity is closed. The metal powder mixed slurry is extruded from the openings at two sides of the coating ball cavity 3 through the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2 until the whole cavity is filled, then the diamond adsorption probe 5 is withdrawn from the coating ball cavity 3, and the diamond and metal powder mixed slurry inside the coating ball cavity 3 forms a diamond coating ball at the moment. Then the ball-wrapping cavity 3 is opened, and the diamond-wrapped ball is formed and falls into the container. And putting the diamond coated ball into a heat treatment furnace for dewaxing treatment, wherein the dewaxing temperature is 450 ℃, and the heat preservation time is 4 hours. And directly putting the dewaxed diamond-coated ball into a graphite die or a steel die for sintering, wherein the sintering temperature is 890 ℃, and the sintering time is 3min, and other metal powder is not required to be added.
Example 2
In the embodiment of the invention, the diamond coated ball is prepared by selecting the metal powder layer and the diamond with the granularity of 600 mu m. The metal powder layer is formed by mixing a plurality of metal powders including Fe, Co, Cu and Sn.
In the embodiment, the mass ratio of the various metal powder components is Fe: Co: Cu: Sn: 40:20:35:5, and the volume fraction of diamond is 20%, so that the diameter of the cavity of the wrapped ball can be designed to be 1020 μm.
Referring to fig. 1, the diamond-coated ball generating device includes a first metal powder slurry extruding device 1, a second metal powder slurry extruding device 2, a coated ball cavity 3, a vacuum negative pressure device 4, a diamond adsorption probe 5 and a diamond 6, wherein the coated ball cavity 3 is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2; the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe 5; the upper end of the diamond adsorption probe 5 is connected with the wrapping ball cavity 3, the probe can extend into the center of the inner part of the cavity, and the lower end of the probe is connected with the vacuum negative pressure device 4, so that the diamond 6 is adsorbed on the diamond adsorption probe 5.
In order to prepare the metal powder into viscous paste-shaped slurry with certain fluidity, an organic binder is used in the embodiment of the invention, and the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol, wherein the ratio of the polyformaldehyde to the polypropylene to the ethylene glycol is 10:70:30 (volume fraction). Metal powder and an organic binder are mixed and stirred to prepare thick paste slurry, and then the thick paste slurry is placed into a first metal powder slurry extrusion device 1 and a second metal powder slurry extrusion device 2.
Under the action of the vacuum negative pressure device 4, wherein the suction force in the negative pressure process is 6N, the diamond adsorption probe 5 absorbs the diamond 6 and extends into the central position of the wrapped ball cavity 3, and the wrapped ball cavity is closed. The metal powder mixed slurry is extruded from the openings at two sides of the coating ball cavity 3 through the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2 until the whole cavity is filled, then the diamond adsorption probe 5 is withdrawn from the coating ball cavity 3, and the diamond and metal powder mixed slurry inside the coating ball cavity 3 forms a diamond coating ball at the moment. The ball-covered chamber 3 is then opened and the diamond-covered ball is formed and falls into the container. And putting the diamond coated ball into a heat treatment furnace for dewaxing treatment, wherein the dewaxing temperature is 450 ℃, and the heat preservation time is 4 hours. And directly putting the dewaxed diamond-coated ball into a graphite die or a steel die for sintering, wherein the sintering temperature is 890 ℃, and the sintering time is 3min, and other metal powder is not required to be added.
Example 3
In the embodiment of the invention, the diamond coated ball is prepared by selecting the metal powder layer and the diamond with the granularity of 1000 mu m. The metal powder layer is formed by mixing a plurality of metal powders including Fe, Co, Cu and Sn.
In the embodiment, the mass ratio of the various metal powder components is Fe: Co: Cu: Sn: 40:20:35:5, and the volume fraction of diamond is 40%, so that the diameter of the cavity of the encapsulated ball can be 1250 μm.
Referring to fig. 1, the diamond-coated ball generating device includes a first metal powder slurry extruding device 1, a second metal powder slurry extruding device 2, a coated ball cavity 3, a vacuum negative pressure device 4, a diamond adsorption probe 5 and a diamond 6, wherein the coated ball cavity 3 is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2; the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe 5; the upper end of the diamond adsorption probe 5 is connected with the wrapping ball cavity 3, the probe can extend into the center of the inner part of the cavity, and the lower end of the probe is connected with the vacuum negative pressure device 4, so that the diamond 6 is adsorbed on the diamond adsorption probe 5.
In order to prepare the metal powder into viscous paste-shaped slurry with certain fluidity, an organic binder is used in the embodiment of the invention, and the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol, wherein the ratio of the polyformaldehyde to the polypropylene to the ethylene glycol is 10:70:30 (volume fraction). Metal powder and an organic binder are mixed and stirred to prepare thick paste slurry, and then the thick paste slurry is placed into a first metal powder slurry extrusion device 1 and a second metal powder slurry extrusion device 2.
Under the action of the vacuum negative pressure device 4, wherein the suction force in the negative pressure process is 6N, the diamond adsorption probe 5 absorbs the diamond 6 and extends into the central position of the wrapped ball cavity 3, and the wrapped ball cavity is closed. The metal powder mixed slurry is extruded from the openings at two sides of the coating ball cavity 3 through the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2 until the whole cavity is filled, then the diamond adsorption probe 5 is withdrawn from the coating ball cavity 3, and the diamond and metal powder mixed slurry inside the coating ball cavity 3 forms a diamond coating ball at the moment. The ball-covered chamber 3 is then opened and the diamond-covered ball is formed and falls into the container. And putting the diamond coated ball into a heat treatment furnace for dewaxing treatment, wherein the dewaxing temperature is 450 ℃, and the heat preservation time is 4 hours. And directly putting the dewaxed diamond-coated ball into a graphite die or a steel die for sintering, wherein the sintering temperature is 890 ℃, and the sintering time is 3min, and other metal powder is not required to be added.
Example 4
In the embodiment of the invention, the diamond coated ball is prepared by selecting the metal powder layer and the diamond with the grain diameter of 75 microns. The metal powder layer is formed by mixing a plurality of metal powders including Fe, Co, Cu and Sn.
In the embodiment, the mass ratio of the various metal powder components is Fe: Co: Cu: Sn: 40:20:35:5, and the volume fraction of diamond is 5%, so that the diameter of the cavity of the wrapped ball can be designed to be 225 μm.
Referring to fig. 1, the diamond-coated ball generating device includes a first metal powder slurry extruding device 1, a second metal powder slurry extruding device 2, a coated ball cavity 3, a vacuum negative pressure device 4, a diamond adsorption probe 5 and a diamond 6, wherein the coated ball cavity 3 is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2; the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe 5; the upper end of the diamond adsorption probe 5 is connected with the wrapping ball cavity 3, the probe can extend into the center of the inner part of the cavity, and the lower end of the probe is connected with the vacuum negative pressure device 4, so that the diamond 6 is adsorbed on the diamond adsorption probe 5.
In order to prepare the metal powder into viscous paste-shaped slurry with certain fluidity, an organic binder is used in the embodiment of the invention, and the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol, wherein the ratio of the polyformaldehyde to the polypropylene to the ethylene glycol is 10:70: 30. Metal powder and an organic binder are mixed and stirred to prepare thick paste slurry, and then the thick paste slurry is placed into a first metal powder slurry extrusion device 1 and a second metal powder slurry extrusion device 2.
Under the action of the vacuum negative pressure device 4, wherein the suction force in the negative pressure process is 6N, the diamond adsorption probe 5 absorbs the diamond 6 and extends into the central position of the wrapped ball cavity 3, and the wrapped ball cavity is closed. The metal powder mixed slurry is extruded from the openings at two sides of the coating ball cavity 3 through the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2 until the whole cavity is filled, then the diamond adsorption probe 5 is withdrawn from the coating ball cavity 3, and the diamond and metal powder mixed slurry inside the coating ball cavity 3 forms a diamond coating ball at the moment. Then the ball-wrapping cavity 3 is opened, and the diamond-wrapped ball is formed and falls into the container. And putting the diamond coated ball into a heat treatment furnace for dewaxing treatment, wherein the dewaxing temperature is 450 ℃, and the heat preservation time is 4 hours. And directly putting the dewaxed diamond-coated ball into a graphite die or a steel die for sintering, wherein the sintering temperature is 890 ℃, and the sintering time is 3min, and other metal powder is not required to be added.
Example 5
In the embodiment of the invention, the diamond coated ball is prepared by selecting the metal powder layer and the diamond with the grain diameter of 1180 mu m. The metal powder layer is formed by mixing a plurality of metal powders including Fe, Co, Cu and Sn.
In the embodiment, the mass ratio of the various metal powder components is Fe: Co: Cu: Sn: 40:20:35:5, and the volume fraction of diamond is 48%, so that the diameter of the cavity of the encapsulated ball can be designed to be 1310 μm.
Referring to fig. 1, the diamond-coated ball generating device includes a first metal powder slurry extruding device 1, a second metal powder slurry extruding device 2, a coated ball cavity 3, a vacuum negative pressure device 4, a diamond adsorption probe 5 and a diamond 6, wherein the coated ball cavity 3 is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2; the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe 5; the upper end of the diamond adsorption probe 5 is connected with the wrapping ball cavity 3, the probe can extend into the center of the inner part of the cavity, and the lower end of the probe is connected with the vacuum negative pressure device 4, so that the diamond 6 is adsorbed on the diamond adsorption probe 5.
In order to prepare the metal powder into viscous paste-shaped slurry with certain fluidity, an organic binder is used in the embodiment of the invention, and the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol, wherein the ratio of the polyformaldehyde to the polypropylene to the ethylene glycol is 10:70:30 (volume fraction). Metal powder and an organic binder are mixed and stirred to prepare thick paste slurry, and then the thick paste slurry is placed into a first metal powder slurry extrusion device 1 and a second metal powder slurry extrusion device 2.
Under the action of the vacuum negative pressure device 4, wherein the suction force in the negative pressure process is 6N, the diamond adsorption probe 5 absorbs the diamond 6 and extends into the central position of the wrapping ball cavity 3 to close the wrapping ball cavity. The metal powder mixed slurry is extruded from the openings at two sides of the coating ball cavity 3 through the first metal powder slurry extruding device 1 and the second metal powder slurry extruding device 2 until the whole cavity is filled, then the diamond adsorption probe 5 is withdrawn from the coating ball cavity 3, and the diamond and metal powder mixed slurry inside the coating ball cavity 3 forms a diamond coating ball at the moment. Then the ball-wrapping cavity 3 is opened, and the diamond-wrapped ball is formed and falls into the container. And putting the diamond coated ball into a heat treatment furnace for dewaxing treatment, wherein the dewaxing temperature is 450 ℃, and the heat preservation time is 4 hours. And directly putting the dewaxed diamond-coated ball into a graphite die or a steel die for sintering, wherein the sintering temperature is 890 ℃, and the sintering time is 3min, and other metal powder is not required to be added.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (16)
1. A preparation method of a diamond-coated ball is characterized in that,
under the action of the vacuum negative pressure device (4), the diamond (6) is absorbed by the diamond absorption probe (5) and extends into the central position of the wrapped ball cavity (3), and the wrapped ball cavity is closed;
extruding the metal powder mixed slurry from the openings at the two sides of the ball-wrapping cavity (3) through a first metal powder slurry extruding device (1) and a second metal powder slurry extruding device (2) until the whole cavity is filled;
the diamond adsorption probe (5) is withdrawn, the cavity is opened, and the diamond and the metal powder layer inside the wrapping ball cavity (3) form a diamond wrapping ball and fall into the container.
2. The method of manufacturing a diamond-coated ball according to claim 1,
the metal powder mixed slurry is viscous paste slurry prepared by mixing and stirring a metal powder layer and an organic binder.
3. The method of manufacturing a diamond-coated ball according to claim 2,
the organic binder is a mixed jelly formed by stirring polyformaldehyde, polypropylene and ethylene glycol;
the ratio of the polyformaldehyde to the polypropylene to the ethylene glycol is 10:70: 30.
4. The method of manufacturing a diamond-coated ball according to claim 2,
the metal powder layer is formed by mixing a plurality of metal powders;
the plurality of metal powders includes Fe, Co, Cu, and Sn.
5. The method of manufacturing a diamond coated ball according to claim 4,
the mass ratio of the multiple metal powder components is Fe to Co to Cu to Sn is 40 to 20 to 35 to 5.
6. The method of manufacturing a diamond-coated ball according to claim 1,
the grain size of the diamond is 75-1180 mu m;
the volume fraction of diamond in the diamond-coated ball is 5-50%.
7. The method of manufacturing a diamond coated ball according to claim 6,
preferably, the diamond particle size is 150 μm, 600 μm and 1000 μm.
8. The method of manufacturing a diamond coated ball according to claim 6,
wherein when the grain diameter of the diamond is 150 μm, the volume fraction of the diamond is 5%; when the grain diameter of the diamond is 600 mu m, the volume fraction of the diamond is 20 percent; when the diamond grain size is 1000 μm, the volume fraction of diamond is 40%.
9. The method of manufacturing a diamond-coated ball according to claim 1,
the diamond coated ball needs to be placed into a heat treatment furnace for dewaxing treatment, the dewaxing temperature is 300-550 ℃, and the heat preservation time is 3-4 h.
10. The method of manufacturing a diamond-coated ball according to claim 9,
the dewaxing temperature is preferably 450 ℃, and the holding time is preferably 4 hours.
11. The method of claim 9, wherein the dewaxed diamond-coated ball is directly sintered in a graphite mold or a steel mold without adding other metal powder.
12. The method for preparing the diamond-coated ball according to claim 11, wherein the sintering temperature of the de-waxed diamond-coated ball in a graphite mold or a steel mold is 850-950 ℃, and the sintering time is 3-5 min.
13. The method of claim 12, wherein the sintering temperature is preferably 890 ℃ and the sintering time is preferably 3 min.
14. A generating device of diamond coated balls is characterized in that,
the generating device comprises a first metal powder slurry extruding device (1), a second metal powder slurry extruding device (2), a wrapping ball cavity (3), a vacuum negative pressure device (4), a diamond adsorption probe (5) and a diamond (6).
15. The apparatus for producing a diamond coated ball according to claim 14,
the wrapping ball cavity (3) is a hollow two hemispheres separated from the middle, and one side of each hemisphere is provided with a small hole and is respectively connected with the first metal powder slurry extruding device (1) and the second metal powder slurry extruding device (2); the openings of the combination positions of the two hemispheres are connected with a diamond adsorption probe (5); the upper end of the diamond adsorption probe (5) is connected with the wrapping ball cavity (3), the probe can stretch into the center inside the cavity, and the lower end of the probe is connected with the vacuum negative pressure device (4), so that the diamond (6) is adsorbed on the diamond adsorption probe (5).
16. A diamond-coated ball produced by the method for producing a diamond-coated ball according to any one of claims 1 to 13,
the diamond-coated ball consists of diamond and a metal powder layer coated on the surface of the diamond.
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