CN113896513B - High-performance alumina ceramic substrate and preparation method thereof - Google Patents

High-performance alumina ceramic substrate and preparation method thereof Download PDF

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CN113896513B
CN113896513B CN202111286677.2A CN202111286677A CN113896513B CN 113896513 B CN113896513 B CN 113896513B CN 202111286677 A CN202111286677 A CN 202111286677A CN 113896513 B CN113896513 B CN 113896513B
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sliding
plate
substrate
substrate body
wall
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CN113896513A (en
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张富启
陈秋财
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Zhuhai Yueke Jinghua Technology Co ltd
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Zhuhai Yueke Jinghua Technology Co ltd
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Abstract

The invention provides a high-performance alumina ceramic substrate and a preparation method thereof, wherein the high-performance alumina ceramic substrate comprises a substrate body, and the substrate body is prepared from the following components in percentage by mass: 96% -99% of aluminum oxide, 0.01% -0.02% of zirconium dioxide, 0.015% -0.02% of yttrium oxide, 0.01% -0.015% of magnesium oxide and the balance of graphene, wherein the surface of the substrate body is provided with a coating. According to the invention, as the graphene is added in the substrate body, the heat conductivity of the substrate body is greatly improved, so that the substrate body has the advantages of high heat conductivity, high bending strength and high electric breakdown resistance, the service life of the substrate body is prolonged, the cost is saved, the surface of the substrate body is provided with the coating, the weldability of the surface of the alumina ceramic substrate is changed, the installation of parts is facilitated, and the surface roughness of the alumina ceramic substrate is reduced.

Description

High-performance alumina ceramic substrate and preparation method thereof
Technical Field
The invention relates to the technical field of electronic materials, in particular to a high-performance alumina ceramic substrate and a preparation method thereof.
Background
The alumina ceramic substrate is formed by sintering 96-99% of alumina ceramic material and a proper amount of mineral raw materials. At present, the commonly used molding methods are: tape casting, dry pressing, slip casting, extrusion molding, and the like. The alumina ceramic substrate can be etched into various patterns like a PCB (printed Circuit Board) and has high current carrying capacity. Therefore, the ceramic substrate has become a basic material of high-power electronic circuit structure technology and interconnection technology, and the ceramic substrate has wide application, and can be used in the fields of automobile hybrid circuit substrates, communication hybrid circuit general substrates, substrates for printers and semiconductor equipment, substrates for new energy automobile fields, substrates for internet-based automobile electronic tags, substrates for military fields (aerospace, aviation, weapon industry, medium electrical department) and the like.
However, the existing alumina ceramic substrate has the defects of low thermal conductivity, low bending strength and low electric breakdown strength, is not easy to dissipate heat, is easy to damage in the using process, seriously reduces the service life of the alumina ceramic substrate, and meanwhile, the alumina ceramic substrate has poor welding performance and higher surface roughness, and is not easy to weld parts on the surface of the alumina ceramic substrate.
Disclosure of Invention
The invention provides a high-performance alumina ceramic substrate and a preparation method thereof, which are used for solving the technical problems that the existing alumina ceramic substrate has the defects of low thermal conductivity, low bending strength and low electric breakdown strength, is difficult to radiate heat, is easy to damage in the using process, seriously reduces the service life of the alumina ceramic substrate, has no weldability, has high surface roughness and is difficult to weld parts on the surface of the alumina ceramic substrate.
In order to solve the above technical problems, the present invention discloses a high performance alumina ceramic substrate, comprising: the substrate body is prepared from the following components in percentage by mass: 96-99% of aluminum oxide, 0.01-0.02% of zirconium dioxide, 0.015-0.02% of yttrium oxide, 0.01-0.015% of magnesium oxide and the balance of graphene, wherein the surface of the substrate body is provided with a coating.
Preferably, the substrate body comprises a substrate, a plurality of heat dissipation holes are formed in the substrate, the heat dissipation holes respectively penetrate through the upper surface and the lower surface of the substrate, and the heat dissipation holes are distributed in an array.
Preferably, the substrate body further comprises a supporting assembly, the supporting assembly is arranged at the bottom of the substrate and comprises a plurality of transverse plates and a plurality of longitudinal plates, the transverse plates and the longitudinal plates are criss-cross to form a grid structure, the upper ends of the transverse plates are fixedly connected with the lower surface of the substrate, the upper ends of the longitudinal plates are fixedly connected with the lower surface of the substrate, and the heat dissipation holes are formed between every two adjacent transverse plates and every two adjacent longitudinal plates.
Preferably, the coating is made by adopting metallization treatment, and the material of the coating is any one of silver, tin and nickel.
Preferably, the base plate, the transverse plate and the longitudinal plate are of an integrally formed structure.
A preparation method of a high-performance alumina ceramic substrate is used for preparing the high-performance alumina ceramic substrate and comprises the following steps:
step 1: preparing mixed powder: respectively obtaining aluminum oxide, zirconium dioxide, yttrium oxide and magnesium oxide according to the proportion of each component, and then mixing the components together and uniformly dispersing to obtain mixed powder;
step 2: preparing a graphene dispersion liquid: weighing 5 parts by weight of the graphene dispersing agent and 25 parts by weight of graphite powder, adding 10 parts by weight of water, adjusting the pH value to 6-7, vibrating and mixing uniformly, putting into an ultrasonic machine, and carrying out ultrasonic treatment according to a preset ultrasonic process, wherein the ultrasonic treatment time is at least 24 hours, and the water temperature is not higher than 70 ℃ in the ultrasonic treatment process; after the ultrasonic treatment is finished, carrying out centrifugal separation on the graphene dispersant/graphene mixed solution; centrifuging at 500-8000 rpm for 10-30 min; after centrifugation is finished, separating to obtain supernatant, namely graphene dispersion liquid;
and step 3: preparing casting slurry: adding the prepared mixed powder into the graphene dispersion liquid, adding a composite binder and a plasticizer after ball milling for a first preset time, adding a film forming aid and a defoaming agent after continuing ball milling for a second preset time, and stirring for a third preset time to obtain casting slurry, wherein the mass ratio of the mixed powder to the graphene dispersion liquid is 9;
and 4, step 4: tape casting: carrying out casting molding on the casting machine after the casting slurry is subjected to vacuum defoaming, and forming a blank after punching and powder coating;
and 5: and (3) sintering: placing the blank in a sintering furnace for sintering to obtain a substrate body;
and 6: surface treatment: and carrying out surface treatment on the substrate body.
Preferably, in the step 4, the substrate body powder is molded into a green body under 450MPa by combining dry pressing and cold isostatic pressing.
Preferably, in the step 6, the surface treatment includes spraying a coating on the surface of the substrate body by using a spraying device and grinding the surface of the substrate body by using a grinding device.
Preferably, the spraying device is used for spraying a coating on the surface of the substrate body, and the spraying device comprises:
spraying box;
the first slide rail is arranged inside the spraying box, the lower end of the first slide rail is fixedly connected with the inner wall of the bottom of the spraying box, a first sliding table is arranged on the first slide rail in a sliding mode, a positioning plate is arranged at the upper end of the first sliding table, a plurality of positioning columns matched with the plurality of heat dissipation holes are arranged on the upper surface of the positioning plate, the lower ends of the positioning columns are fixedly connected with the upper surface of the positioning plate, and the substrate body is arranged on the upper surface of the positioning plate;
the vertical rod is vertically arranged at the left end of the positioning plate, and the lower end of the vertical rod is fixedly connected with the left end of the positioning plate;
the first box body is arranged above the positioning plate, the rear side wall of the first box body is fixedly connected with the inner wall of the rear side of the spraying box, a piston plate is arranged in the first box body in a sliding mode, and the piston plate slides left and right along the inner wall of the first box body;
the cross rod is arranged on the left side wall of the piston plate, one end, far away from the piston plate, of the cross rod penetrates through the left side wall of the first box body and is fixedly connected with the upper end of the vertical rod, and the cross rod is perpendicular to the vertical rod;
the first pipe body is arranged on the bottom wall of the first box body, the first pipe body is positioned at the right end of the first box body, the first pipe body is communicated with the inside of the first box body, one end, away from the first box body, of the first pipe body extends to the upper side of the substrate body and is provided with a spray head, and a first one-way valve is arranged in the first pipe body;
the second box body is arranged on the inner wall of the right side of the spraying box, spraying liquid is arranged in the second box body, the second box body is communicated with the right end of the first box body through a second pipe body, and a second one-way valve is arranged in the second pipe body;
the fixed plate is arranged above the first box body, and the upper end of the fixed plate is fixedly connected with the inner wall of the upper side of the spraying box;
the first motor is arranged on the inner wall of the left side of the spraying box, the output end of the first motor is provided with a first rotating shaft, one end, far away from the first motor, of the first rotating shaft penetrates through the fixed plate, extends to the right side of the fixed plate and is provided with a first bevel gear, the first rotating shaft is rotatably connected with the fixed plate, a rotating barrel is arranged on the first rotating shaft, a guide groove is axially formed in the rotating barrel, a guide rod is slidably arranged in the guide groove, the upper end of the guide rod is matched with the guide groove, and the lower end of the guide rod is fixedly connected with the upper surface of the cross rod;
the second rotating shaft is arranged between the first bevel gear and the second box body, the upper end of the second rotating shaft is rotatably connected with the inner wall of the upper side of the spraying box, and a second bevel gear is arranged on the second rotating shaft and meshed with the first bevel gear;
and the fan blades are arranged at the lower end of the second rotating shaft and are positioned above the substrate body.
Preferably, the grinding device is used for grinding the surface of the substrate body, and the grinding device comprises:
grinding a box;
the supporting table is arranged in the grinding box, the bottom wall of the supporting table is fixedly connected with the inner wall of the bottom of the grinding box, the right side wall of the supporting table is fixedly connected with the inner wall of the right side of the grinding box, and the substrate body is placed on the supporting table of the grinding box;
the electric telescopic rod is arranged on the inner wall of the left side of the grinding box, one end of the electric telescopic rod is provided with a moving column, one end, far away from the electric telescopic rod, of the moving column is provided with a mounting hole, a sliding column is arranged in the mounting hole in a sliding mode, one end, far away from the moving column, of the sliding column is provided with a pressing plate, the right side wall of the pressing plate is in contact with the left end of the substrate body, a first spring is arranged in the mounting hole, one end of the first spring is fixedly connected with one end, far away from the pressing plate, of the sliding column, and the other end of the first spring is fixedly connected with the inner wall of the left side of the mounting hole;
the contact switch is arranged at the right end of the moving column;
the second motor is arranged in the grinding box, the fixed end of the second motor is fixedly connected with the inner wall of the upper end of the grinding box, the second motor is electrically connected with the contact switch, the output end of the second motor is provided with a screw rod, a sleeve is sleeved on the screw rod and is in threaded connection with the screw rod, the lower end of the screw rod is provided with a guide post, and the outer wall of the guide post is in sliding connection with the inner wall of the sleeve;
the first sliding plate is arranged in the grinding box in a sliding manner, the left end and the right end of the first sliding plate are respectively connected with the inner walls of the left side and the right side of the grinding box in a sliding manner, and the upper surface of the first sliding plate is fixedly connected with the lower end of the sleeve;
the rotating block is arranged in the sleeve and is in sliding connection with the inner wall of the sleeve, and the bottom wall of the rotating block is in rotating connection with the upper surface of the first sliding plate;
the second spring is arranged between the rotating block and the guide post, one end of the second spring is fixedly connected with the upper surface of the rotating block, and the other end of the second spring is fixedly connected with the lower end of the guide post;
the second sliding plate is arranged at the lower end of the first sliding plate and is in sliding connection with the inner wall of the left side of the grinding box;
the second sliding rail is arranged on the lower surface of the first sliding plate, a second sliding table and a third sliding table are arranged on the second sliding rail in a sliding mode, the second sliding table is located on the left side of the third sliding table, and a rack is arranged between the second sliding table and the third sliding table;
the third spring is arranged between the second sliding table and the second sliding plate, one end of the third spring is fixedly connected with the left side wall of the second sliding table, and the other end of the third spring is fixedly connected with the right side wall of the second sliding plate;
the mounting plate is arranged on the lower surface of the third sliding table, a plurality of third motors are arranged on the lower surface of the mounting plate, third rotating shafts are arranged at the output ends of the third motors, and the third rotating shafts extend to the upper part of the substrate body and are provided with grinding discs;
the first belt pulley is arranged on the screw rod;
the fourth pivot, the fourth pivot sets up right-hand the second motor, fourth pivot upper end with grind incasement end inner wall and rotate and connect, set up the second belt pulley in the fourth pivot, the second belt pulley pass through the drive belt with first belt pulley transmission is connected, fourth pivot lower extreme extends to first slide below sets up first gear, first gear is incomplete gear, first gear with the rack profile of tooth meshes mutually.
The technical scheme of the invention has the following advantages: the invention provides a high-performance alumina ceramic substrate and a preparation method thereof, wherein the high-performance alumina ceramic substrate comprises a substrate body, and the substrate body is prepared from the following components in percentage by mass: 96% -99% of aluminum oxide, 0.01% -0.02% of zirconium dioxide, 0.015% -0.02% of yttrium oxide, 0.01% -0.015% of magnesium oxide and the balance of graphene, wherein the surface of the substrate body is provided with a coating. According to the invention, as the graphene is added in the substrate body, the heat conductivity of the substrate body is greatly improved, so that the substrate body has the advantages of high heat conductivity, high bending strength and high electrical breakdown resistance, the service life of the substrate body is prolonged, the cost is saved, the surface of the substrate body is provided with the coating, the weldability of the surface of the alumina ceramic substrate is changed, the installation of parts is facilitated, and the surface roughness of the alumina ceramic substrate is reduced.
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 the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the apparatus particularly pointed out in the written description and drawings thereof.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a front view of a high performance alumina ceramic substrate according to the present invention;
FIG. 2 is a schematic view of the internal structure of a high performance alumina ceramic substrate according to the present invention;
FIG. 3 is a bottom view of a high performance alumina ceramic substrate in accordance with the present invention;
FIG. 4 is a schematic view of a spraying apparatus used in a method for preparing a high performance alumina ceramic substrate according to the present invention;
FIG. 5 is a schematic view of a polishing apparatus used in a method for preparing a high performance alumina ceramic substrate according to the present invention;
FIG. 6 is an enlarged view taken at A of FIG. 5 in accordance with the present invention;
FIG. 7 is a schematic view showing a state of a polishing apparatus in a method for producing a high-performance alumina ceramic substrate according to the present invention;
FIG. 8 is a schematic view showing another state of a polishing apparatus in a method for preparing a high-performance alumina ceramic substrate according to the present invention.
In the figure: 1. a substrate body; 2. a substrate; 3. heat dissipation holes; 4. a transverse plate; 5. a longitudinal plate; 6. a spraying box; 7. a first slide rail; 8. a first sliding table; 9. positioning a plate; 10. a positioning column; 11. a vertical rod; 12. a first case; 13. a piston plate; 14. a cross bar; 15. a first pipe body; 16. a spray head; 17. a second case; 18. a second tube body; 19. a fixing plate; 20. a first motor; 21. a first rotating shaft; 22. a first bevel gear; 23. rotating the barrel; 24. a guide groove; 25. a guide bar; 26. a second rotating shaft; 27. a second bevel gear; 28. a fan blade; 29. grinding the materials in a grinding box; 30. a support table; 31. an electric telescopic rod; 32. moving the column; 33. mounting holes; 34. a sliding post; 35. pressing a plate; 36. a first spring; 37. a contact switch; 38. a second motor; 39. a screw; 40. a sleeve; 41. a guide post; 42. a first slide plate; 43. rotating the block; 44. a second spring; 45. a second slide plate; 46. a second slide rail; 47. a second sliding table; 48. a third sliding table; 49. a rack; 50. a third spring; 51. mounting a plate; 52. a third motor; 53. a third rotating shaft; 54. a grinding disk; 55. a first pulley; 56. a fourth rotating shaft; 57. a second pulley; 58. a transmission belt; 59. a first gear.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.
An embodiment of the present invention provides a high performance alumina ceramic substrate, as shown in fig. 1 to 8, including: the substrate body 1 is prepared from the following components in percentage by mass: 96% -99% of aluminum oxide, 0.01% -0.02% of zirconium dioxide, 0.015% -0.02% of yttrium oxide, 0.01% -0.015% of magnesium oxide and the balance of graphene, wherein a coating is arranged on the surface of the substrate body 1;
the substrate body 1 comprises a substrate 2, a plurality of heat dissipation holes 3 are arranged in the substrate 2, the heat dissipation holes 3 respectively penetrate through the upper surface and the lower surface of the substrate 2, and the heat dissipation holes 3 are distributed in an array;
the substrate body 1 further comprises a supporting assembly, the supporting assembly is arranged at the bottom of the base plate 2 and comprises a plurality of transverse plates 4 and a plurality of longitudinal plates 5, the transverse plates 4 and the longitudinal plates 5 are criss-cross to form a grid structure, the upper ends of the transverse plates 4 are fixedly connected with the lower surface of the base plate 2, the upper ends of the longitudinal plates 5 are fixedly connected with the lower surface of the base plate 2, and the heat dissipation holes 3 are located between two adjacent transverse plates 4 and two adjacent longitudinal plates 5;
the coating is made by adopting metallization treatment, and the material of the coating is any one of silver, tin and nickel;
the base plate 2, the transverse plate 4 and the longitudinal plate 5 are of an integrally formed structure.
The working principle and the beneficial effects of the technical scheme are as follows: the substrate body 1 is prepared from the following components in percentage by mass: 96% -99% of aluminum oxide, 0.01% -0.02% of zirconium dioxide, 0.015% -0.02% of yttrium oxide, 0.01% -0.015% of magnesium oxide, and the balance of graphene, wherein one substrate body 1 can be composed of 96% of aluminum oxide, 0.015% of zirconium dioxide, 0.015% of yttrium oxide, 0.01% of magnesium oxide, and 3.96% of graphene, the thermal conductivity of the substrate body 1 is 30W/m.K, the electrical breakdown strength is 13KV/mm, the bending strength is 450MPa, and the surface roughness is 0.2, the other substrate body 1 can be composed of 99% of aluminum oxide, 0.01% of zirconium dioxide, 0.015% of yttrium oxide, 0.015% of magnesium oxide, and 0.06% of graphene, the thermal conductivity of the substrate body 1 is 25W/m.K, the electrical breakdown strength is 16KV/mm, the bending strength is 500MPa, and the surface roughness is 0.3, the graphene is added in the substrate body 1, so that the heat conductivity of the substrate body 1 is greatly improved, the substrate body 1 has the advantages of high heat conductivity, high bending strength and high electrical breakdown strength, the service life of the substrate body 1 is prolonged, the cost is saved, in addition, the welding property of the surface of an alumina ceramic substrate is changed by arranging the coating on the surface of the substrate body 1, the installation of parts is facilitated, the surface roughness of the alumina ceramic substrate is reduced, in addition, the substrate body 1 consists of the substrate 2 and the supporting component, the heat dissipation holes 3 are arranged in the substrate 2, the heat dissipation speed of the substrate body 1 can be further improved, the supporting component is in a grid structure formed by the criss-cross arrangement of the plurality of transverse plates 4 and the plurality of longitudinal plates 5, the effective support is provided for the substrate 2, and the integral bending strength of the substrate body 1 is improved, the service life of the substrate body 1 is prolonged, the metal coating is arranged on the surface of the substrate body 1, the weldability of the surface of the substrate body 1 can be enhanced, the welding of parts is facilitated, and the application range of the alumina ceramic substrate is enlarged.
The invention also provides a preparation method of the high-performance alumina ceramic substrate, which is used for preparing the high-performance alumina ceramic substrate and comprises the following steps:
step 1: preparing mixed powder: respectively obtaining aluminum oxide, zirconium dioxide, yttrium oxide and magnesium oxide according to the proportion of each component, and then mixing the components together and uniformly dispersing to obtain mixed powder;
and 2, step: preparing a graphene dispersion liquid: weighing 5 parts by weight of the graphene dispersing agent and 25 parts by weight of graphite powder, adding 10 parts by weight of water, adjusting the pH value to 6-7, vibrating and mixing uniformly, putting into an ultrasonic machine, and carrying out ultrasonic treatment according to a preset ultrasonic process, wherein the ultrasonic treatment time is at least 24 hours, and the water temperature is not higher than 70 ℃ in the ultrasonic treatment process; after the ultrasonic treatment is finished, carrying out centrifugal separation on the graphene dispersant/graphene mixed solution; centrifuging at 500-8000 rpm for 10-30 min; after centrifugation is finished, separating to obtain supernatant, namely graphene dispersion liquid;
and 3, step 3: preparing casting slurry: adding the prepared mixed powder into the graphene dispersion liquid, adding a composite binder and a plasticizer after ball milling for a first preset time, continuing ball milling for a second preset time, adding a film-forming assistant and a defoaming agent, and stirring for a third preset time to obtain casting slurry, wherein the mass ratio of the mixed powder to the graphene dispersion liquid is 9;
and 4, step 4: tape casting: carrying out casting molding on the casting machine after the casting slurry is vacuumed and defoamed, and forming a blank after punching and powder coating;
and 5: and (3) sintering: placing the blank in a sintering furnace for sintering to obtain a substrate body 1;
step 6: surface treatment: and carrying out surface treatment on the substrate body 1, wherein the surface treatment comprises spraying a coating on the surface of the substrate body 1 by adopting a spraying device and grinding the surface of the substrate body 1 by adopting a grinding device.
The working principle and the beneficial effects of the technical scheme are as follows: firstly, preparing mixed powder: respectively obtaining aluminum oxide, zirconium dioxide, yttrium oxide and magnesium oxide according to the proportion of each component, and then mixing the components together and uniformly dispersing to obtain mixed powder; next, preparing a graphene dispersion: weighing 5 parts by weight of the graphene dispersing agent and 25 parts by weight of graphite powder, adding 10 parts by weight of water, adjusting the pH value to 6-7, vibrating and mixing uniformly, putting the mixture into an ultrasonic machine, and carrying out ultrasonic treatment according to a preset ultrasonic process, wherein the ultrasonic time is at least 24h, the water temperature in the ultrasonic treatment process is not higher than 70 ℃, and the preset ultrasonic process is as follows: the power is 100W, the ultrasonic treatment is stopped after 4 hours, the ultrasonic treatment is stopped after 12 hours, the ultrasonic treatment is stopped for 4 hours and then 12 hours, and the operation is circulated until the ultrasonic treatment time is 24 hours; after the ultrasonic treatment is finished, carrying out centrifugal separation on the graphene dispersant/graphene mixed solution; centrifuging at 500-8000 rpm for 10-30 min; after centrifugation is finished, separating to obtain supernatant, namely the graphene dispersion liquid; preparing casting slurry: adding the prepared mixed powder into the graphene dispersion liquid, adding a composite binder and a plasticizer after ball milling for a first preset time, continuing ball milling for a second preset time, adding a film-forming assistant and a defoaming agent, and stirring for a third preset time to obtain casting slurry, wherein the mass ratio of the mixed powder to the graphene dispersion liquid is 9; then tape casting: carrying out casting molding on the casting machine after the casting slurry is subjected to vacuum defoaming, and forming a blank after punching and powder coating; and then sintering: placing the blank in a sintering furnace for sintering to obtain a substrate body 1; and finally, carrying out surface treatment: carry out surface treatment to substrate body 1, surface treatment is including adopting the spraying device to grind substrate body 1 surface spraying coating and adopting grinder to substrate body 1 surface, substrate body 1 through the preparation of above-mentioned step, it is high to have the thermal conductivity, bending strength is high, roughness is low, advantages such as electrical breakdown strength height, the life of substrate body 1 has been improved, make substrate body 1 possess the high performance, more extensive application, above-mentioned production step simple process, production process safety ring protects, the production cost is reduced, and the device is suitable for large-scale industrial production.
In one embodiment, as shown in fig. 4, the spraying device is used for spraying a coating on the surface of the substrate body 1, and the spraying device comprises:
a spraying box 6;
the first slide rail 7 is arranged inside the spraying box 6, the lower end of the first slide rail 7 is fixedly connected with the inner wall of the bottom of the spraying box 6, the first slide rail 7 is provided with a first sliding table 8 in a sliding manner, the upper end of the first sliding table 8 is provided with a positioning plate 9, the upper surface of the positioning plate 9 is provided with a plurality of positioning columns 10 matched with the plurality of heat dissipation holes 3, the lower ends of the positioning columns 10 are fixedly connected with the upper surface of the positioning plate 9, and the substrate body 1 is arranged on the upper surface of the positioning plate 9;
the vertical rod 11 is vertically arranged at the left end of the positioning plate 9, and the lower end of the vertical rod 11 is fixedly connected with the left end of the positioning plate 9;
the first box body 12 is arranged above the positioning plate 9, the rear side wall of the first box body 12 is fixedly connected with the inner wall of the rear side of the spraying box 6, a piston plate 13 is arranged in the first box body 12 in a sliding manner, and the piston plate 13 slides left and right along the inner wall of the first box body 12;
the cross rod 14 is arranged on the left side wall of the piston plate 13, one end, far away from the piston plate 13, of the cross rod 14 penetrates through the left side wall of the first box body 12 and is fixedly connected with the upper end of the vertical rod 11, and the cross rod 14 is perpendicular to the vertical rod 11;
the first pipe body 15 is arranged at the bottom wall of the first box body 12, the first pipe body 15 is positioned at the right end of the first box body 12, the first pipe body 15 is communicated with the inside of the first box body 12, one end of the first pipe body 15, far away from the first box body 12, extends to the upper part of the substrate body 1 and is provided with a spray head 16, and a first one-way valve is arranged in the first pipe body 15;
the second box body 17 is arranged on the inner wall of the right side of the spraying box 6, spraying liquid is arranged in the second box body 17, the second box body 17 is communicated with the right end of the first box body 12 through a second pipe body 18, and a second check valve is arranged in the second pipe body 18;
the fixing plate 19 is arranged above the first box body 12, and the upper end of the fixing plate 19 is fixedly connected with the inner wall of the upper side of the spraying box 6;
the first motor 20 is arranged on the inner wall of the left side of the spraying box 6, the output end of the first motor 20 is provided with a first rotating shaft 21, one end, far away from the first motor 20, of the first rotating shaft 21 penetrates through the fixed plate 19, extends to the right side of the fixed plate 19 and is provided with a first bevel gear 22, the first rotating shaft 21 is rotatably connected with the fixed plate 19, the first rotating shaft 21 is provided with a rotating barrel 23, the rotating barrel 23 is axially provided with a guide groove 24, a guide rod 25 is slidably arranged in the guide groove 24, the upper end of the guide rod 25 is matched with the guide groove 24, and the lower end of the guide rod 25 is fixedly connected with the upper surface of the cross rod 14;
a second rotating shaft 26, the second rotating shaft 26 being disposed between the first bevel gear 22 and the second housing 17, the upper end of the second rotating shaft 26 being rotatably connected to the inner wall of the upper side of the spraying box 6, the second rotating shaft 26 being provided with a second bevel gear 27, the second bevel gear 27 being engaged with the first bevel gear 22;
a plurality of fan blades 28, a plurality of said fan blades 28 are set up in the lower end of said second spindle 26, said fan blades 28 are located above said substrate body 1.
The working principle and the beneficial effects of the technical scheme are as follows: when spraying, firstly, the substrate body 1 is placed on the positioning plate 9, when the substrate body is placed, the heat dissipation holes 3 of the substrate 2 are aligned with the positioning columns 10, so that the substrate body 1 is stably installed on the surface of the positioning plate 9, then spraying liquid is added in the second box 17, the first motor 20 is started, the first motor 20 rotates to drive the first rotating shaft 21 to rotate, the first rotating shaft 21 rotates to drive the rotating barrel 23 to rotate, the guide rod 25 slides in the guide groove 24 when the rotating barrel 23 rotates, the guide rod 25 reciprocates left and right under the action of the guide groove 24, when the guide rod 25 moves left and right, the guide rod 25 drives the cross rod 14 to move left and right, the cross rod 14 drives the piston plate 13 to slide left and right in the first box 12, the spraying liquid in the second box 17 is quantitatively pumped into the first box 12, when the cross rod 14 moves right, the cross rod 14 drives the piston plate 13 to slide left and right in the first box 12, the piston plate 13 extrudes the spraying liquid, the spraying liquid flows from the first pipe 15 to the spray head 16 and finally is sprayed from the spray head 16 to the surface of the substrate body 1, in the spraying process, the cross rod 14 drives the positioning plate 9 to move rightwards through the vertical rod 11, the positioning plate 9 drives the first sliding table 8 to slide on the first sliding rail 7, meanwhile, the substrate body 1 on the positioning plate 9 also moves rightwards from left, the spray head 16 uniformly sprays the spraying liquid on the surface of the substrate body 1, meanwhile, the first rotating shaft 21 rotates to drive the first bevel gear 22 to rotate, the first bevel gear 22 rotates to drive the second bevel gear 27 to rotate, the second bevel gear 27 rotates to drive the second rotating shaft 26 to rotate, the second rotating shaft 26 rotates to drive the fan blades 28 to rotate, the fan blades 28 can blow the surface of the substrate body 1 so as to dry the spraying liquid, when the cross rod 14 moves leftwards from right again, the fan blades 28 can perform secondary drying on the surface of the substrate body 1, improved and weathered efficiency, through setting up this spraying device, reciprocating motion about along with piston plate 13, the even spraying of quantitative spraying liquid is on 1 surface of substrate body in the first box 12, make 1 surface coating thickness of substrate body unanimous, through reciprocal a lot of spraying, the thickness of coating has been increased, and will carry out automation twice along with the spraying and weather once, because the coating is thinner, can be faster weather, do not need to dry alone after whole spraying is accomplished, the preparation efficiency of coating has been improved greatly, only set up a first motor 20 and can accomplish the spraying, the work of weathering, and the production cost is reduced, it is more energy-conserving high-efficient.
In one embodiment, as shown in fig. 5 to 8, the polishing apparatus is used for polishing the surface of the substrate body 1, and the polishing apparatus includes:
a grinding box 29;
the supporting table 30 is arranged in the grinding box 29, the bottom wall of the supporting table 30 is fixedly connected with the inner wall of the bottom of the grinding box 29, the right side wall of the supporting table 30 is fixedly connected with the inner wall of the right side of the grinding box 29, and the substrate body 1 is placed on the supporting table 30 of the grinding box 29;
the electric telescopic rod 31 is arranged on the inner wall of the left side of the grinding box 29, one end of the electric telescopic rod 31 is provided with a moving column 32, one end of the moving column 32, which is far away from the electric telescopic rod 31, is provided with a mounting hole 33, a sliding column 34 is arranged in the mounting hole 33 in a sliding manner, one end of the sliding column 34, which is far away from the moving column 32, is provided with a pressing plate 35, the right side wall of the pressing plate 35 is in contact with the left end of the substrate body 1, a first spring 36 is arranged in the mounting hole 33, one end of the first spring 36 is fixedly connected with one end of the sliding column 34, which is far away from the pressing plate 35, and the other end of the first spring 36 is fixedly connected with the inner wall of the left side of the mounting hole 33;
a contact switch 37, wherein the contact switch 37 is arranged at the right end of the moving column 32;
the second motor 38 is arranged in the grinding box 29, the fixed end of the second motor 38 is fixedly connected with the inner wall of the upper end of the grinding box 29, the second motor 38 is electrically connected with the contact switch 37, the output end of the second motor 38 is provided with a screw 39, a sleeve 40 is sleeved on the screw 39, the sleeve 40 is in threaded connection with the screw 39, the lower end of the screw 39 is provided with a guide column 41, and the outer wall of the guide column 41 is in sliding connection with the inner wall of the sleeve 40;
the first sliding plate 42 is arranged inside the grinding box 29 in a sliding manner, the left end and the right end of the first sliding plate 42 are respectively connected with the inner walls of the left side and the right side of the grinding box 29 in a sliding manner, and the upper surface of the first sliding plate 42 is fixedly connected with the lower end of the sleeve 40;
the rotating block 43 is arranged in the sleeve 40, the rotating block 43 is slidably connected with the inner wall of the sleeve 40, and the bottom wall of the rotating block 43 is rotatably connected with the upper surface of the first sliding plate 42;
the second spring 44 is arranged between the rotating block 43 and the guide post 41, one end of the second spring 44 is fixedly connected with the upper surface of the rotating block 43, and the other end of the second spring 44 is fixedly connected with the lower end of the guide post 41;
a second sliding plate 45, wherein the second sliding plate 45 is arranged at the lower end of the first sliding plate 42, and the second sliding plate 45 is slidably connected with the inner wall of the left side of the grinding box 29;
the second slide rail 46 is arranged on the lower surface of the first slide plate 42, a second sliding table 47 and a third sliding table 48 are arranged on the second slide rail 46 in a sliding manner, the second sliding table 47 is located on the left side of the third sliding table 48, and a rack 49 is arranged between the second sliding table 47 and the third sliding table 48;
the third spring 50 is arranged between the second sliding table 47 and the second sliding plate 45, one end of the third spring 50 is fixedly connected with the left side wall of the second sliding table 47, and the other end of the third spring 50 is fixedly connected with the right side wall of the second sliding plate 45;
the mounting plate 51 is arranged on the lower surface of the third sliding table 48, the lower surface of the mounting plate 51 is provided with a plurality of third motors 52, the output ends of the third motors 52 are provided with third rotating shafts 53, and the third rotating shafts 53 extend to the upper part of the substrate body 1 and are provided with grinding discs 54;
a first pulley 55, the first pulley 55 being disposed on the screw 39;
a fourth rotating shaft 56, the fourth rotating shaft 56 is disposed at the right side of the second motor 38, the upper end of the fourth rotating shaft 56 is rotatably connected to the inner wall of the upper end of the grinding box 29, a second pulley 57 is disposed on the fourth rotating shaft 56, the second pulley 57 is in transmission connection with the first pulley 55 through a transmission belt 58, the lower end of the fourth rotating shaft 56 extends to the lower side of the first sliding plate 42 and is provided with a first gear 59, the first gear 59 is an incomplete gear, and the first gear 59 is engaged with the tooth profile of the rack 49.
The working principle and the beneficial effects of the technical scheme are as follows: after the coating is sprayed, the surface roughness of the substrate body 1 can be reduced, then the substrate body 1 is placed on a supporting table 30 of a grinding box 29, an electric telescopic rod 31 is started, the electric telescopic rod 31 extends out to drive a moving column 32 to approach the substrate body 1, the moving column 32 drives a sliding column 34 and a pressing plate 35 to approach the substrate body 1, the pressing plate 35 extrudes the substrate body 1 to the right side of the grinding box 29, the right end of the substrate body 1 is contacted with the inner wall of the right side of the grinding box 29, then the extrusion is continued until a contact switch 37 is contacted with the left side wall of the pressing plate 35, the contact switch 37 is respectively electrically connected with the electric telescopic rod 31, a second motor 38 and a third motor 52, at the moment, the electric telescopic rod 31 stops working, the second motor 38 and the third motor 52 start working, the third motor 52 can drive a third rotating shaft 53 to rotate, the third rotating shaft 53 can drive a grinding disc 54 to rotate above the substrate body 1, the second motor 38 rotates to drive the screw rod 39 to rotate, the screw rod 39 rotates to drive the first belt pulley 55 to rotate, the first belt pulley 55 drives the second belt pulley 57 to rotate through the transmission belt 58, the second belt pulley 57 rotates to drive the fourth rotating shaft 56 to rotate, the fourth rotating shaft 56 rotates to drive the first gear 59 to rotate, the screw rod 39 is in threaded connection with the sleeve 40, the screw rod 39 rotates to drive the sleeve 40 to move downwards, the sleeve 40 drives the first sliding plate 42 to slide downwards along the inner wall of the grinding box 29, the first sliding plate 42 drives the second sliding rail 46 to move downwards, when the screw rod 39 is separated from the sleeve 40, the guide post 41 slides inside the sleeve 40, the guide post 41 drives the rotating block 43 to rotate on the upper surface of the first sliding plate 42 through the second spring 44, at this time, the first gear 59 and the rack 49 are at the same height, and the lower surface of the grinding disc 54 is in contact with the upper surface of the substrate body 1 (as shown in fig. 7), the grinding disc 54 starts to grind the upper surface of the substrate body 1, because the first gear 59 is an incomplete gear, the first gear 59 and the rack 49 can be intermittently meshed, when the first gear 59 is meshed with the rack 49, the first gear 59 drives the rack 49 to move rightwards, the second sliding table 47 and the third sliding table 48 slide rightwards along the second sliding rail 46, the third spring 50 is stretched, the second sliding table 47 drives the third motor 52 to move rightwards through the mounting plate 51, the third motors 52 drive the grinding disc 54 to slide rightwards from left on the upper surface of the substrate body 1 through the third rotating shaft 53, so that the surface of the substrate body 1 is ground rightwards and leftwards, after the rack 49 is separated from the first gear 59 (as shown in fig. 8), under the action of the third spring 50, the third sliding table 48 slides leftwards, the third rotating shaft 53 drives the grinding disc 54 to slide leftwards, the grinding disc 54 grinds the upper surface of the substrate body 1 from right to left, through multiple reciprocating motions, the grinding disc 54 can fully grind the upper surface of the substrate body 1, the consistency and the uniformity and the roughness of the substrate can be ground, and the whole product can be automatically improved after the substrate is clamped by the switch, and the grinding device can be automatically opened.
In one embodiment, the apparatus further comprises an alarm device, the alarm device comprising:
the alarm is arranged on the outer wall of the substrate body 1;
the controller is arranged on the outer wall of the substrate body 1 and is electrically connected with the alarm;
the controller controls the alarm to work based on the load of the surface of the substrate body 1, and the method comprises the following steps:
step 11: when the part is installed on the surface of the substrate body 1, the maximum load of the part on the surface of the substrate body 1 is calculated, and then the actual fracture probability of the substrate body 1 is calculated according to the maximum load through the following formula:
Figure GDA0003790489220000171
wherein, P 1 Exp is an exponential function with a natural constant e as base, which is the actual fracture probability of the substrate body 1,
Figure GDA0003790489220000172
is the actual bending strength, sigma, of the substrate body 1 0 For a predetermined bending strength of the substrate body 1, F 1 Is the maximum load of the part on the surface of the substrate body 1,/ 1 Is a predetermined length, s, of the substrate body 1 1 Is a predetermined width, h, of the substrate body 1 1 The thickness of the substrate body 1 is preset, and w is a preset Weber modulus;
step 12: based on the calculation result of the step 11, the controller compares the actual fracture probability of the substrate body 1 with the preset fracture probability of the substrate body 1, and when the actual fracture probability of the substrate body 1 is larger than the preset fracture probability of the substrate body 1, the controller controls the alarm to send an alarm prompt.
The working principle and the beneficial effects of the technical scheme are as follows: in the scheme, the actual fracture probability of the substrate body 1 can be automatically calculated according to the maximum load borne by the surface of the substrate body 1, wherein the Weber modulus is a parameter in a Weber distribution function in statistical fracture mechanics, for ceramic materials, the Weber modulus is mostly used for reflecting the discreteness of the material strength, the higher the Weber modulus is, the smaller the discreteness is, in the invention, the Weber modulus is 10, and in the actual calculation process, for example, F is 1 Take 500N, l 1 Take 0.2m,s 1 Taking the mixture at a speed of 0.05m 1 Take 0.005m, sigma 0 Taking the pressure of 300MPa,
Figure GDA0003790489220000173
the calculated pressure can be 120MPa,
Figure GDA0003790489220000174
calculated to be 0.99, then P 1 The calculation can obtain 0.01, wherein, the preset fracture probability is 0.5, because the actual fracture probability is less than the preset fracture probability, the controller can not control the alarm to send out an alarm prompt, if the actual fracture probability is greater than the preset fracture probability, the alarm sends out the alarm prompt, the staff can reduce the number of parts mounted on the surface of the substrate body 1 according to the alarm prompt, thereby avoiding the substrate body 1 from fracturing when the parts are mounted, predicting the fracture in advance, improving the working efficiency, avoiding causing the waste of the substrate body 1, and saving the cost.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (6)

1. A preparation method of a high-performance alumina ceramic substrate is characterized by comprising the following steps: the substrate body (1), the substrate body (1) is prepared by the following components by mass percent: 96% -99% of aluminum oxide, 0.01% -0.02% of zirconium dioxide, 0.015% -0.02% of yttrium oxide, 0.01% -0.015% of magnesium oxide and the balance of graphene, wherein a coating is arranged on the surface of the substrate body (1);
the substrate body (1) comprises a substrate (2), a plurality of radiating holes (3) are formed in the substrate (2), the radiating holes (3) respectively penetrate through the upper surface and the lower surface of the substrate (2), and the radiating holes (3) are distributed in an array;
the preparation method of the high-performance alumina ceramic substrate comprises the following steps:
step 1: preparing mixed powder: respectively obtaining aluminum oxide, zirconium dioxide, yttrium oxide and magnesium oxide according to the proportion of each component, and then mixing the components together and uniformly dispersing to obtain mixed powder;
and 2, step: preparing a graphene dispersion liquid: weighing 5 parts by weight of the graphene dispersing agent and 25 parts by weight of graphite powder, adding 10 parts by weight of water, adjusting the pH value to 6-7, vibrating and mixing uniformly, putting into an ultrasonic machine, and carrying out ultrasonic treatment according to a preset ultrasonic process, wherein the ultrasonic treatment time is at least 24h, and the water temperature is not higher than 70 ℃ in the ultrasonic treatment process; after the ultrasonic treatment is finished, carrying out centrifugal separation on the graphene dispersant/graphene mixed solution; centrifuging at 500-8000 rpm for 10-30 min; after centrifugation is finished, separating to obtain supernatant, namely graphene dispersion liquid;
and step 3: preparing casting slurry: adding the prepared mixed powder into the graphene dispersion liquid, adding a composite binder and a plasticizer after ball milling for a first preset time, adding a film forming aid and a defoaming agent after continuing ball milling for a second preset time, and stirring for a third preset time to obtain casting slurry, wherein the mass ratio of the mixed powder to the graphene dispersion liquid is 9;
and 4, step 4: tape casting: carrying out casting molding on the casting machine after the casting slurry is vacuumed and defoamed, and forming a blank after punching and powder coating;
and 5: and (3) sintering: placing the blank in a sintering furnace for sintering to obtain a substrate body (1);
and 6: surface treatment: carrying out surface treatment on the substrate body (1);
in the step 6, the surface treatment comprises spraying a coating on the surface of the substrate body (1) by using a spraying device and grinding the surface of the substrate body (1) by using a grinding device;
the spraying device is used for spraying a coating on the surface of the substrate body (1), and comprises:
a spraying box (6);
the substrate comprises a first slide rail (7), the first slide rail (7) is arranged inside the spraying box (6), the lower end of the first slide rail (7) is fixedly connected with the inner wall of the bottom of the spraying box (6), a first sliding table (8) is arranged on the first slide rail (7) in a sliding manner, a positioning plate (9) is arranged at the upper end of the first sliding table (8), a plurality of positioning columns (10) matched with the plurality of heat dissipation holes (3) are arranged on the upper surface of the positioning plate (9), the lower ends of the positioning columns (10) are fixedly connected with the upper surface of the positioning plate (9), and the substrate body (1) is arranged on the upper surface of the positioning plate (9);
the vertical rod (11) is vertically arranged at the left end of the positioning plate (9), and the lower end of the vertical rod (11) is fixedly connected with the left end of the positioning plate (9);
the first box body (12), the first box body (12) is arranged above the positioning plate (9), the rear side wall of the first box body (12) is fixedly connected with the inner wall of the rear side of the spraying box (6), a piston plate (13) is arranged in the first box body (12) in a sliding mode, and the piston plate (13) slides left and right along the inner wall of the first box body (12);
the cross rod (14) is arranged on the left side wall of the piston plate (13), one end, far away from the piston plate (13), of the cross rod (14) penetrates through the left side wall of the first box body (12) and is fixedly connected with the upper end of the vertical rod (11), and the cross rod (14) is perpendicular to the vertical rod (11);
the first pipe (15) is arranged at the bottom wall of the first box body (12), the first pipe (15) is positioned at the right end of the first box body (12), the first pipe (15) is communicated with the inside of the first box body (12), one end, far away from the first box body (12), of the first pipe (15) extends to the position above the substrate body (1) and is provided with a spray head (16), and a first one-way valve is arranged in the first pipe (15);
the second box body (17) is arranged on the inner wall of the right side of the spraying box (6), spraying liquid is arranged in the second box body (17), the second box body (17) is communicated with the right end of the first box body (12) through a second pipe body (18), and a second one-way valve is arranged in the second pipe body (18);
the fixing plate (19) is arranged above the first box body (12), and the upper end of the fixing plate (19) is fixedly connected with the inner wall of the upper side of the spraying box (6);
the spraying device comprises a first motor (20), wherein the first motor (20) is arranged on the inner wall of the left side of the spraying box (6), a first rotating shaft (21) is arranged at the output end of the first motor (20), one end, far away from the first motor (20), of the first rotating shaft (21) penetrates through the fixing plate (19), extends to the right side of the fixing plate (19) and is provided with a first bevel gear (22), the first rotating shaft (21) is rotatably connected with the fixing plate (19), a rotating barrel (23) is arranged on the first rotating shaft (21), a guide groove (24) is axially arranged on the rotating barrel (23), a guide rod (25) is slidably arranged in the guide groove (24), the upper end of the guide rod (25) is matched with the guide groove (24), and the lower end of the guide rod (25) is fixedly connected with the upper surface of the cross rod (14);
the second rotating shaft (26) is arranged between the first bevel gear (22) and the second box body (17), the upper end of the second rotating shaft (26) is rotatably connected with the inner wall of the upper side of the spraying box (6), a second bevel gear (27) is arranged on the second rotating shaft (26), and the second bevel gear (27) is meshed with the first bevel gear (22);
a plurality of fan blades (28), a plurality of fan blades (28) are arranged at the lower end of the second rotating shaft (26), and the fan blades (28) are positioned above the substrate body (1).
2. The method for preparing a high performance alumina ceramic substrate according to claim 1, wherein the substrate body (1) further comprises a supporting component, the supporting component is disposed at the bottom of the substrate (2), the supporting component comprises a plurality of transverse plates (4) and a plurality of longitudinal plates (5), the plurality of transverse plates (4) and the plurality of longitudinal plates (5) are criss-cross to form a grid structure, the upper ends of the transverse plates (4) are fixedly connected with the lower surface of the substrate (2), the upper ends of the longitudinal plates (5) are fixedly connected with the lower surface of the substrate (2), and the heat dissipation holes (3) are located between two adjacent transverse plates (4) and two adjacent longitudinal plates (5).
3. The method for preparing a high-performance alumina ceramic substrate according to claim 2, wherein the coating is made by metallization, and the coating is made of any one of silver, tin and nickel.
4. A method as claimed in claim 3, wherein the base plate (2), the transverse plate (4) and the longitudinal plate (5) are integrally formed.
5. The method for preparing a high performance alumina ceramic substrate as claimed in claim 1, wherein in step 4, the substrate body (1) is powder molded into a green body under 450MPa by a combination of dry pressing and cold isostatic pressing.
6. The method for preparing a high performance alumina ceramic substrate according to claim 1, wherein the grinding device is used for grinding the surface of the substrate body (1), and the grinding device comprises:
a grinding box (29);
the supporting table (30) is arranged in the grinding box (29), the bottom wall of the supporting table (30) is fixedly connected with the inner wall of the bottom of the grinding box (29), the right side wall of the supporting table (30) is fixedly connected with the inner wall of the right side of the grinding box (29), and the substrate body (1) is placed on the supporting table (30) of the grinding box (29);
the electric telescopic rod (31) is arranged on the inner wall of the left side of the grinding box (29), one end of the electric telescopic rod (31) is provided with a moving column (32), one end, far away from the electric telescopic rod (31), of the moving column (32) is provided with a mounting hole (33), a sliding column (34) is arranged in the mounting hole (33) in a sliding mode, one end, far away from the moving column (32), of the sliding column (34) is provided with a pressing plate (35), the right side wall of the pressing plate (35) is in contact with the left end of the substrate body (1), a first spring (36) is arranged in the mounting hole (33), one end of the first spring (36) is fixedly connected with one end, far away from the pressing plate (35), of the sliding column (34), and the other end of the first spring (36) is fixedly connected with the inner wall of the left side of the mounting hole (33);
a contact switch (37), wherein the contact switch (37) is arranged at the right end of the moving column (32);
the second motor (38) is arranged in the grinding box (29), the fixed end of the second motor (38) is fixedly connected with the inner wall of the upper end of the grinding box (29), the second motor (38) is electrically connected with the contact switch (37), the output end of the second motor (38) is provided with a screw rod (39), the screw rod (39) is sleeved with a sleeve (40), the sleeve (40) is in threaded connection with the screw rod (39), the lower end of the screw rod (39) is provided with a guide column (41), and the outer wall of the guide column (41) is in sliding connection with the inner wall of the sleeve (40);
the first sliding plate (42) is arranged in the grinding box (29) in a sliding mode, the left end and the right end of the first sliding plate (42) are respectively connected with the inner walls of the left side and the right side of the grinding box (29) in a sliding mode, and the upper surface of the first sliding plate (42) is fixedly connected with the lower end of the sleeve (40);
the rotating block (43) is arranged in the sleeve (40), the rotating block (43) is in sliding connection with the inner wall of the sleeve (40), and the bottom wall of the rotating block (43) is in rotating connection with the upper surface of the first sliding plate (42);
the second spring (44) is arranged between the rotating block (43) and the guide column (41), one end of the second spring (44) is fixedly connected with the upper surface of the rotating block (43), and the other end of the second spring (44) is fixedly connected with the lower end of the guide column (41);
a second sliding plate (45), wherein the second sliding plate (45) is arranged at the lower end of the first sliding plate (42), and the second sliding plate (45) is in sliding connection with the inner wall of the left side of the grinding box (29);
the second sliding rail (46), the second sliding rail (46) is arranged on the lower surface of the first sliding plate (42), a second sliding table (47) and a third sliding table (48) are arranged on the second sliding rail (46) in a sliding manner, the second sliding table (47) is positioned on the left side of the third sliding table (48), and a rack (49) is arranged between the second sliding table (47) and the third sliding table (48);
the third spring (50) is arranged between the second sliding table (47) and the second sliding plate (45), one end of the third spring (50) is fixedly connected with the left side wall of the second sliding table (47), and the other end of the third spring (50) is fixedly connected with the right side wall of the second sliding plate (45);
the mounting plate (51), the mounting plate (51) is arranged on the lower surface of the third sliding table (48), the lower surface of the mounting plate (51) is provided with a plurality of third motors (52), the output ends of the third motors (52) are provided with third rotating shafts (53), and the third rotating shafts (53) extend to the upper part of the substrate body (1) and are provided with grinding discs (54);
a first pulley (55), the first pulley (55) being disposed on the screw (39);
the fourth rotating shaft (56), the fourth rotating shaft (56) is arranged on the right of the second motor (38), the upper end of the fourth rotating shaft (56) is rotatably connected with the inner wall of the upper end of the grinding box (29), a second belt pulley (57) is arranged on the fourth rotating shaft (56), the second belt pulley (57) is in transmission connection with the first belt pulley (55) through a transmission belt (58), the lower end of the fourth rotating shaft (56) extends to the lower side of the first sliding plate (42) and is provided with a first gear (59), the first gear (59) is an incomplete gear, and the first gear (59) is meshed with the tooth form of the rack (49).
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