MCH blank preparation process

Abstract

The invention discloses an MCH blank preparation process, and belongs to the field of MCH preparation. The MCH green body preparation process comprises the following steps of S1, mixing and grinding of raw material powder; S2, premixing and adjustment of a material-ball ratio; S3, defoaming treatment and tape casting viscosity control; S4, tape casting and control of a cutter height and a speed; a plurality of groups of raw materials are mixed through a first mixer, raw material powder is ground through a powder sand mill, then the raw materials and a solvent are mixed through a second mixer to form slurry, defoaming treatment is carried out through a vacuum defoaming machine, tape casting is carried out through a tape casting machine, and high-temperature sintering is carried out through a sintering box. By controlling each process parameter, the MCH material with excellent mechanical properties and electrical properties can be prepared, and the method has the advantages of simple process, easiness in operation, short preparation period, low cost and suitability for large-scale production.

Description

Technical Field

[0001] The present invention relates to the technical field of MCH preparation, in particular to a process for preparing an MCH embryo. Background Art

[0002] MCH is an important electronic material, mainly composed of alumina ceramic green tape and metal heating resistor slurry. Alumina ceramic green tape has become an ideal substrate for MCH heating elements due to its durability, flatness, smoothness, high temperature resistance and corrosion resistance. Metal heating resistor slurry is usually made of high melting point metals such as tungsten or molybdenum manganese, and has good conductivity and thermal stability.

[0003] After searching, the Chinese patent application number is a patent for a method for preparing an ultra-thin high-strength alumina ceramic substrate, which discloses a method for preparing an ultra-thin high-strength alumina ceramic substrate, comprising the following steps: preparing a sintering-aid mixed liquid, and the viscosity of the sintering-aid mixed liquid is between 10000 mPa·s and 30000 mPa·s; preparing a slurry-powder mixed liquid, and the viscosity of the slurry-powder mixed liquid is between 15000 mPa·s and 30000 mPa·s; preparing a mixed slurry, and the viscosity of the mixed slurry is between 10000 mPa·s and 30000 mPa·s. -25000 mPa·s; preparing ceramic green sheets, passing the mixed slurry through the bottom plate heating zone to form a solid green ribbon, which is then cut into ceramic green sheets; green sheet leveling, attaching smooth films to both sides of the green sheet, placing it on a smooth metal plate, vacuum-sealing it, and then isostatic pressing it; debinding, debinding the flattened green sheet to obtain a debinded green sheet; sintering, sintering the debinded green sheet to obtain an ultra-thin, high-strength alumina ceramic substrate. This method is more energy-efficient and environmentally friendly, and can produce an alumina ceramic substrate with a smooth surface, thin thickness, and excellent bending resistance.

[0004] The above patents still have the following deficiencies: (1) The traditional MCH preparation process has some problems, such as complex preparation process, long preparation cycle, high preparation cost, etc., which limit its application in the field of electronic component manufacturing;

[0005] (2) The defect of being inconvenient to adjust the width of the green sheet. The existing device relies on manual adjustment during use, which is not convenient for achieving automatic and precise adjustment of the cutting width. Not only is the efficiency low, but the adjustment accuracy is also difficult to guarantee. Summary of the Invention

[0006] The purpose of the present invention is to solve some problems existing in the traditional MCH preparation process in the prior art, such as complex preparation process, long preparation cycle, high preparation cost, etc., which limit its application in the field of electronic component manufacturing, and propose an MCH embryo preparation process.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A process for preparing an MCH green body comprises the following steps:

[0009] S1: mixing and grinding raw material powders, pouring the raw material powders into the interior of the first mixer according to a certain proportion to mix them evenly, and grinding them to a certain fineness in a turbine nano sand mill;

[0010] S2: Premixing and adjusting the material-ball ratio: putting the ground materials into the second mixer for premixing and adjusting the material-ball ratio;

[0011] S3: Degassing and casting viscosity control: the premixed slurry is placed in a vacuum degassing machine for degassing, and the casting viscosity is controlled according to the thickness and temperature;

[0012] S4: tape casting and knife height and speed control: the deaerated slurry is passed through the tape casting machine for tape casting, and the knife height and casting speed are controlled according to the green body thickness and casting speed;

[0013] S5: Cut and age the green sheet after tape casting as needed.

[0014] As a preferred technical solution of the present application, the sanding time of the turbine nano sand mill in step S2 is 50 min to 70 min, and the particle size of the sanding slurry is 2.1 μm to 2.35 μm.

[0015] As the preferred technical solution of the present application, the maximum speed of the vacuum degassing machine during degassing in step S3 is 40 rpm, the speed during maturation is 9±1 rpm, and the vacuum degree is -0.09-0.1 MPa.

[0016] As a preferred technical solution of the present application, the casting machine in step S4 includes a winding rack installed on both sides of the casting machine, a casting film wound on the outside of the winding rack, a starting motor installed at the bottom end of the casting machine, a material trough fixed at the top of one side of the casting machine, a hopper installed at the top of the material trough, a first pneumatic telescopic rod installed on one side of the material trough, a casting knife fixed at the telescopic end of the first pneumatic telescopic rod and sliding on one side of the material trough, a drying bin installed at the top of the casting machine, an infrared heater installed at the top of the drying bin, a first tensioning roller installed at the top of the casting machine, a second tensioning roller arranged at the bottom end of the first tensioning roller and rotatably connected to the casting machine, a separating roller arranged on one side of the bottom end of the first tensioning roller and rotatably connected to the casting machine, a guide roller rotatably connected to the inside of one side of the casting machine, a guide plate sliding on the outside of the guide roller, a moving structure arranged on one side of the casting machine and connected to the guide plate, a cutting structure arranged on one side of the moving structure, a loading and unloading structure arranged on one side of the cutting structure, a cutting knife installed on one side of the loading and unloading structure and connected to the second tensioning roller, and an alumina ceramic green material strip arranged at the top of the guide roller.

[0017] As a preferred technical solution of the present application, the starting motor is connected to the winding frame through a first transmission belt, the first tensioning roller is connected to one group of winding frames through a second transmission belt, one group of guide rollers is connected to the first tensioning roller through a third transmission belt, and the two groups of guide rollers are connected through transmission gears.

[0018] As the preferred technical solution of the present application, the movable structure includes a fixed seat fixed at the bottom end of the casting machine, guide rods fixed on both sides of the fixed seat, a movable seat sliding on the outside of the guide rods, a first connecting frame fixed at the top of the movable seat and the fixed seat and connected to the guide plate, a folding frame installed on one side of the fixed seat and the movable seat, a movable column rotatably connected to the bottom end of the folding frame, a guide groove opened in the fixed seat and the movable seat and slidably connected to the movable column, and a second pneumatic telescopic rod rotatably connected to the bottom end of one side of the folding frame.

[0019] As the preferred technical solution of the present application, the cutting structure includes a transmission shaft rotatably connected to the bottom end of the casting machine, a first transmission wheel fixed at one end of the transmission shaft, a fourth transmission belt sleeved on the outside of the first transmission wheel and connected to the guide roller, guide rails fixed at both ends of the transmission shaft, a sliding sleeve sliding on the guide rail and the outside of the transmission shaft, a third transmission wheel fixed on the outside of the sliding sleeve, a second connecting frame rotatably connected to one side of the sliding sleeve and connected to the movable seat and the fixed seat, a rotating shaft rotatably connected to the inside of one side of the second connecting frame, a second transmission wheel installed on the outside of the rotating shaft, and a fifth transmission belt sleeved on the outside of the second transmission wheel and the third transmission wheel.

[0020] As a preferred technical solution of the present application, the transmission shaft passes through the second connecting frame and is connected to the sliding sleeve, and the sliding sleeves are distributed at equal intervals on the outside of the transmission shaft.

[0021] As the preferred technical solution of the present application, the loading and unloading structure includes a limit plate installed on one side of the rotating shaft, a mounting seat installed on one side of the limit plate, a sleeve sliding on the outside of the mounting seat and connected to the cutting knife, a screw rotatably connected to one side of the inside of the mounting seat, a hexagonal block fixed on one side of the screw, a screw sleeve threadedly connected to the outside of the screw, a push block fixed on the outside of the screw sleeve, and a pressure strip rotatably connected to the inside of the mounting seat. The front cross-section of the mounting seat is a cross-shaped structure design, and a hole groove matching the shape of the mounting seat is opened inside the sleeve, and a torsion spring is installed between the pressure strip and the mounting seat.

[0022] As the preferred technical solution of the present application, the MCH green product has a sintering shrinkage of 14.1% to 14.5% at a temperature of 1610°C to 1630°C and a density of 3.81g / cm³ to 3.87g / cm³.

[0023] Compared with the prior art, the present invention provides a process for preparing MCH embryos, which has the following beneficial effects:

[0024] 1. The MCH green body preparation process comprises the following steps: mixing multiple groups of raw materials in a first mixer, grinding the raw material powder in a turbine nano sand mill, mixing the raw materials with a solvent in a second mixer to form a slurry, degassing in a vacuum degassing machine, and tape casting in a tape casting machine. By controlling various process parameters, an MCH material with excellent mechanical and electrical properties can be prepared. The process has the advantages of simple process, easy operation, short preparation cycle, low cost, and suitability for large-scale production.

[0025] 2. The MCH green billet preparation process uses a second pneumatic telescopic rod to drive the folding frame to unfold, which in turn drives multiple sets of moving seats to move, adjust the position of the guide plate and the cutting knife, and realize the function of width adjustment. It can flexibly adjust product specifications while reducing downtime and manual adjustment time during the production process, thereby improving overall production efficiency.

[0026] 3. The MCH green sheet preparation process uses a sliding sleeve to slide on the outside of the transmission shaft to facilitate the movement of the second connecting frame and the cutting blade. At the same time, the transmission shaft drives the second and third transmission wheels through the guide rail to drive the rotating shaft to rotate. This allows the cutting blade to continue cutting the green sheet while adjusting the width, realizing the function of rotary cutting, ensuring the stability and consistency of the cutting quality, and the incision is straight and high-quality.

[0027] 4. The MCH green body preparation process drives the screw to rotate by rotating the hexagonal block, so that the push block is separated from the pressure strip. At the same time, the pressure strip is retracted into the inside of the mounting seat, pushing the cutting knife to drive the sleeve to slide on the outside of the mounting seat. The cutting knife is disassembled for replacement, which realizes the defect of easy replacement, allowing maintenance personnel to complete the replacement of the cutter wheel more quickly and reduce dependence on professional skills. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic structural diagram of the MCH green embryo preparation process proposed in the present invention;

[0029] Figure 2 This is one of the structural schematic diagrams of the tape casting machine for the MCH green embryo preparation process proposed in the present invention;

[0030] Figure 3 This is the second structural diagram of the tape casting machine for the MCH green embryo preparation process proposed in the present invention;

[0031] Figure 4 This is the third structural diagram of the tape casting machine for the MCH green embryo preparation process proposed in the present invention;

[0032] Figure 5 This is one of the three-dimensional structural diagrams of the mobile structure of the MCH green embryo preparation process proposed in the present invention;

[0033] Figure 6 This is the second schematic diagram of the three-dimensional structure of the mobile structure of the MCH green embryo preparation process proposed in the present invention;

[0034] Figure 7 This is a schematic diagram of the three-dimensional cross-sectional structure of the cutting structure of the MCH green embryo preparation process proposed in the present invention;

[0035] Figure 8 Schematic diagram of the three-dimensional cross-sectional structure of the loading and unloading structure of the MCH green embryo preparation process proposed in the present invention;

[0036] Figure 9 This is a three-dimensional schematic diagram of the loading and unloading structure of the MCH green embryo preparation process proposed in the present invention;

[0037] Figure 10 This is the overall flow chart of the MCH green embryo preparation process proposed in the present invention.

[0038] In the picture:

[0039] 1. First mixer; 2. Turbine nano sand mill; 3. Second mixer; 4. Vacuum degassing machine; 5. Casting machine; 7. Second tensioning roller; 8. Winding frame; 9. Cast film; 10. Transmission gear; 11. Moving structure; 1101. Guide rod; 1102. Fixed seat; 1103. Second pneumatic telescopic rod; 1104. Moving seat; 1105. First connecting frame; 1106. Guide groove; 1107. Moving column; 1108. Folding frame; 12. Cutting structure; 1201. Second connecting frame; 1202. First transmission wheel; 1203. Transmission shaft; 1204. Rotating shaft; 1205. Second transmission wheel; 1206. Fifth transmission belt; 1207. Guide rail; 120 8. Sliding sleeve; 1209. Third transmission wheel; 13. Loading and unloading structure; 1301. Housing; 1302. Hexagonal block; 1303. Push block; 1304. Pressure strip; 1305. Screw; 1306. Screw sleeve; 1307. Limiting plate; 1308. Mounting seat; 14. Alumina ceramic green material belt; 15. First tensioning roller; 16. Drying chamber; 17. Casting knife; 18. First pneumatic telescopic rod; 19. Hopper; 20. Material trough; 21. Starting motor; 22. First transmission belt; 23. Second transmission belt; 24. Third transmission belt; 25. Fourth transmission belt; 26. Guide plate; 27. Cutting knife; 28. Infrared heater; 29. ​​Guide roller; 30. Separating roller. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0041] like Figures 1 to 10 As shown, the embodiment of the present invention provides a process for preparing an MCH green body, comprising the following steps:

[0042] S1: Mixing and grinding of raw material powders: Pour the raw material powders into the first mixer 1 in a certain proportion and mix them evenly, and grind them to a certain fineness in the turbine nano sand mill 2; the sand milling process parameters are shown in Table 1.

[0043] S2: Premixing and adjusting the material-ball ratio: placing the ground material into the second mixer 3 for premixing, and adjusting the material-ball ratio;

[0044] S3: Degassing and casting viscosity control: the premixed slurry is placed in a vacuum degassing machine 4 for degassing, and the casting viscosity is controlled according to the thickness and temperature;

[0045] S4: tape casting and knife height and speed control: the deaerated slurry is passed through the tape casting machine 5 for tape casting, and the knife height and casting speed are controlled according to the green body thickness and casting speed; the specific tape casting control parameters are shown in Tables 2 to 4;

[0046] S5: Cut and age the green sheet after tape casting as needed.

[0047] The working principle and beneficial effects of the above technical solution are as follows: multiple groups of raw materials are mixed by a first mixer 1, the raw material powder is ground by a turbine nano sand mill 2, and then the raw materials are mixed with a solvent by a second mixer 3 to form a slurry, and a vacuum degassing machine 4 is used for degassing, and the slurry is cast by a casting machine 5 to form a green sheet.

[0048] Table 1 Casting temperature and viscosity parameters

[0049] Table 2 Casting knife height control parameters

[0050] Table 3 Casting speed control parameters

[0051] like Figure 10 As shown, in one embodiment: in step S2, the sanding time of the turbine nano sand mill 2 is 50 min to 70 min, and the particle size of the sanding slurry is 2.1 μm to 2.35 μm.

[0052] like Figure 1 As shown, in one embodiment: in step S3, the maximum speed of the vacuum degassing machine 4 during degassing is 40 rpm, the speed during aging is 9±1 rpm, and the vacuum degree is -0.09-0.1 MPa.

[0053] like Figure 2 、 Figure 3 and Figure 4As shown, in one embodiment: the casting machine 5 in step S4 includes a winding rack 8 installed on both sides of the casting machine 5, a casting film 9 wound on the outside of the winding rack 8, a starting motor 21 installed at the bottom end of the casting machine 5, a material trough 20 fixed to the top of one side of the casting machine 5, a hopper 19 installed at the top of the material trough 20, a first pneumatic telescopic rod 18 installed on one side of the material trough 20, a casting knife 17 fixed at the telescopic end of the first pneumatic telescopic rod 18 and sliding on one side of the material trough 20, a drying chamber 16 installed at the top of the casting machine 5, an infrared heater 28 installed at the top of the drying chamber 16, a first tensioning roller 15 installed at the top of the casting machine 5, and a setting A second tensioning roller 7 is provided at the bottom end of the first tensioning roller 15 and is rotatably connected to the casting machine 5; a separating roller 30 is provided on one side of the bottom end of the first tensioning roller 15 and is rotatably connected to the casting machine 5; a guide roller 29 is rotatably connected inside one side of the casting machine 5; a guide plate 26 slides on the outside of the guide roller 29; a moving structure 11 is provided on one side of the inside of the casting machine 5 and is connected to the guide plate 26; a cutting structure 12 is provided on one side of the moving structure 11; a loading and unloading structure 13 is provided on one side of the cutting structure 12; a cutting knife 27 is installed on one side of the loading and unloading structure 13 and is connected to the second tensioning roller 7; and an alumina ceramic green material belt 14 is provided on the top of the guide roller 29.

[0054] The working principle and beneficial effects of the above technical solution are as follows: during the casting process, the deaerated slurry is poured into the interior of the material tank 20 through the hopper 19, so that the slurry adheres to the surface of the casting film 9, the motor 21 is started to drive the casting film 9 to move, and at the same time the casting knife 17 flattens the slurry on the surface of the casting film 9, and the thickness of the slurry is controlled by the first pneumatic telescopic rod 18. The slurry sheet is moved to the interior of the drying chamber 16 by the casting film 9, and the infrared heater 28 performs preliminary drying on the slurry to harden its surface, so as to facilitate the separation of the casting film 9 from the slurry sheet. The slurry sheet is tensioned by the first tensioning roller 15 to make the slurry sheet smooth and not prone to wrinkles. At the same time, the cutting knife 27 cuts the slurry sheet, and the guide plate 26 guides the movement of the slurry sheet. The slurry sheet is discharged by the guide roller 29. The position of the cutting knife 27 and the guide plate 26 is adjusted by the movable structure 11 to facilitate the adjustment of the width of the slurry sheet. At the same time, the cutting structure 12 facilitates the driving of the cutting knife 27 to rotate and cut the slurry sheet while adjusting the width. The cutting knife 27 is conveniently disassembled and replaced by the loading and unloading structure 13.

[0055] like Figure 2 、 Figure 3 and Figure 4As shown, in one embodiment: the starting motor 21 is connected to the winding frame 8 through a first transmission belt 22, the first tensioning roller 15 is connected to one group of winding frames 8 through a second transmission belt 23, one group of guide rollers 29 is connected to the first tensioning roller 15 through a third transmission belt 24, and the two groups of guide rollers 29 are connected through a transmission gear 10.

[0056] The working principle and beneficial effects of the above technical solution are: power is transmitted through the second transmission belt 23, the third transmission belt 24, and the fourth transmission belt 25, so that the winding frame 8, the first tensioning roller 15 and the guide roller 29 rotate synchronously to transport the slurry sheet.

[0057] like Figure 5 and Figure 6 As shown, in one embodiment: the movable structure 11 includes a fixed seat 1102 fixed at the bottom end of the inner part of the casting machine 5, a guide rod 1101 fixed on both sides of the fixed seat 1102, a movable seat 1104 sliding on the outside of the guide rod 1101, a first connecting frame 1105 fixed at the top of the movable seat 1104 and the fixed seat 1102 and connected to the guide plate 26, a folding frame 1108 installed on one side of the fixed seat 1102 and the movable seat 1104, a movable column 1107 rotatably connected to the bottom end of the inner part of the folding frame 1108, a guide groove 1106 opened in the fixed seat 1102 and the movable seat 1104 and slidably connected to the movable column 1107, and a second pneumatic telescopic rod 1103 rotatably connected to the bottom end of one side of the folding frame 1108.

[0058] The working principle and beneficial effects of the above technical solution are as follows: multiple groups of guide grooves 1106 are connected through the folding frame 1108, the second pneumatic telescopic rod 1103 is started to extend and retract, so that the second pneumatic telescopic rod 1103 pulls the folding frame 1108 to unfold, and at the same time, the folding frame 1108 synchronously drives multiple groups of moving seats 1104 to slide on the outside of the guide rod 1101, adjusts the position of the guide plate 26 and the cutting knife 27, and at the same time, the moving column 1107 slides inside the guide groove 1106 to guide the moving direction of the folding frame 1108.

[0059] like Figure 7As shown, in one embodiment: the cutting structure 12 includes a transmission shaft 1203 rotatably connected to the bottom end of the casting machine 5, a first transmission wheel 1202 fixed at one end of the transmission shaft 1203, a fourth transmission belt 25 sleeved on the outside of the first transmission wheel 1202 and connected to the guide roller 29, guide rails 1207 fixed at both ends of the transmission shaft 1203, a sliding sleeve 1208 sliding on the outside of the guide rail 1207 and the transmission shaft 1203, a third transmission wheel 1209 fixed on the outside of the sliding sleeve 1208, a second connecting frame 1201 rotatably connected to one side of the sliding sleeve 1208 and connected to the movable seat 1104 and the fixed seat 1102, a rotating shaft 1204 rotatably connected to the inside of one side of the second connecting frame 1201, a second transmission wheel 1205 installed on the outside of the rotating shaft 1204, and a fifth transmission belt 1206 sleeved on the outside of the second transmission wheel 1205 and the third transmission wheel 1209.

[0060] The working principle and beneficial effects of the above technical solution are as follows: the first transmission wheel 1202 is connected to the guide roller 29 through the fourth transmission belt 25, so that the guide roller 29 drives the first transmission wheel 1202 and the transmission shaft 1203 to rotate while rotating. When the movable seat 1104 drives the second connecting frame 1201 to move, the sleeve 1208 slides on the outside of the transmission shaft 1203 to facilitate the movement of the position of the second connecting frame 1201 and the cutting knife 27. At the same time, the transmission shaft 1203 drives the sleeve 1208 and the third transmission wheel 1209 to rotate on one side of the second connecting frame 1201 through the guide rail 1207, and then the fifth transmission belt 1206 drives the rotating shaft 1204 to rotate through the second transmission wheel 1205, so that the cutting knife 27 can still cut the slurry sheet while adjusting the width.

[0061] like Figure 7 As shown, in one embodiment: the transmission shaft 1203 passes through the second connecting frame 1201 and is connected to the sliding sleeve 1208, and the sliding sleeve 1208 is distributed at equal intervals on the outside of the transmission shaft 1203.

[0062] like Figure 8 and Figure 9As shown, in one embodiment: the loading and unloading structure 13 includes a limit plate 1307 installed on one side of the rotating shaft 1204, a mounting seat 1308 installed on one side of the limit plate 1307, a housing 1301 sliding on the outside of the mounting seat 1308 and connected to the cutting knife 27, a screw 1305 rotatably connected to one side of the inside of the mounting seat 1308, a hexagonal block 1302 fixed on one side of the screw 1305, a screw sleeve 1306 threadedly connected to the outside of the screw 1305, a push block 1303 fixed on the outside of the screw sleeve 1306, and a pressure strip 1304 rotatably connected to the inside of the mounting seat 1308, the front cross-section of the mounting seat 1308 is designed in a cross-shaped structure, and a hole groove matching the shape of the mounting seat 1308 is opened inside the housing 1301, and a torsion spring is installed between the pressure strip 1304 and the mounting seat 1308.

[0063] The working principle and beneficial effects of the above technical solution are as follows: when the cutting blade 27 needs to be replaced, the screw 1305 is driven to rotate by using the hexagonal wrench to rotate the inner hexagonal block 1302, and then the screw sleeve 1306 moves toward the outside of the mounting seat 1308 through the thread on the surface of the screw sleeve 1305. At the same time, the pushing block 1303 is separated from the pressure strip 1304. At the same time, the torsion spring is able to drive the pressure strip 1304 to reset and be retracted into the inside of the mounting seat 1308, pushing the cutting blade 27 to drive the sleeve 1301 to slide on the outside of the mounting seat 1308, and the cutting blade 27 is disassembled for replacement. The replaced cutting blade 27 and the sleeve 1301 are sleeved on the outside of the mounting seat 1308, and the inner hexagonal block 1302 is rotated in the opposite direction, so that the screw sleeve 1306 drives the pushing block 1303 to push the pressure strip 1304 to flip, so that the pressure strip 1304 is against the sleeve 1301, and the position of the sleeve 1301 and the cutting blade 27 is fixed.

[0064] Specifically, the MCH green sheet preparation process is as follows: a plurality of raw materials are mixed by a first mixer 1, the raw material powder is ground by a powder sand mill 2, the raw materials are then mixed with a solvent by a second mixer 3 to form a slurry, and a vacuum degassing machine 4 is used for degassing, the slurry is tape-casted by a tape casting machine 5, and a sintering box 6 is used for high-temperature sintering to form a green sheet;

[0065] During the casting process, the deaerated slurry is poured into the material tank 20 through the hopper 19, so that the slurry adheres to the surface of the casting film 9, and the motor 21 is started to drive the casting film 9 to move. At the same time, the casting knife 17 flattens the slurry on the surface of the casting film 9, and the thickness of the slurry is controlled by the first pneumatic telescopic rod 18. The slurry sheet is driven by the casting film 9 to move to the inside of the drying chamber 16, and the infrared heater 28 performs preliminary drying on the slurry to harden its surface, so as to facilitate the separation of the casting film 9 from the slurry sheet. The slurry sheet is tensioned by the first tensioning roller 15 to make the slurry sheet flat and not prone to wrinkles. At the same time, the cutting knife 27 cuts the slurry sheet. Cutting is performed, and at the same time, the guide disk 26 guides the movement of the slurry sheet, and the slurry sheet is discharged through the guide roller 29. The power is transmitted through the second transmission belt 23, the third transmission belt 24, and the fourth transmission belt 25, so that the winding frame 8, the first tensioning roller 15 and the guide roller 29 rotate synchronously to convey the slurry sheet. The position of the cutting knife 27 and the guide disk 26 is adjusted by the movable structure 11 to adjust the width of the slurry sheet. At the same time, the cutting structure 12 facilitates the driving of the cutting knife 27 to rotate and cut the slurry sheet while adjusting the width. The cutting knife 27 is conveniently disassembled and replaced by the loading and unloading structure 13;

[0066] The multiple sets of guide grooves 1106 are connected by the folding frame 1108, and the second pneumatic telescopic rod 1103 is activated to extend and retract, causing the second pneumatic telescopic rod 1103 to pull the folding frame 1108 to unfold. At the same time, the folding frame 1108 synchronously drives the multiple sets of movable seats 1104 to slide outside the guide rod 1101, adjusting the positions of the guide plate 26 and the cutting knife 27. At the same time, the movable column 1107 slides inside the guide groove 1106 to guide the movement direction of the folding frame 1108.

[0067] The first transmission wheel 1202 is connected to the guide roller 29 by the fourth transmission belt 25, so that the guide roller 29 drives the first transmission wheel 1202 and the transmission shaft 1203 to rotate while rotating. When the movable seat 1104 drives the second connecting frame 1201 to move, the sliding sleeve 1208 slides on the outside of the transmission shaft 1203 to facilitate the movement of the second connecting frame 1201 and the cutting knife 27. At the same time, the transmission shaft 1203 drives the sliding sleeve 1208 and the third transmission wheel 1209 to rotate on one side of the second connecting frame 1201 through the guide rail 1207. Then, the fifth transmission belt 1206 drives the rotating shaft 1204 to rotate through the second transmission wheel 1205, so that the cutting knife 27 can still cut the slurry sheet while adjusting the width;

[0068] When the cutting blade 27 needs to be replaced, the hexagonal block 1302 is rotated by using a hexagonal wrench to drive the screw 1305 to rotate, and then the screw sleeve 1306 moves toward the outside of the mounting seat 1308 through the thread on the surface of the screw sleeve 1305. At the same time, the pushing block 1303 is separated from the pressure strip 1304. At the same time, the torsion spring is able to drive the pressure strip 1304 to reset and be collected into the inside of the mounting seat 1308, pushing the cutting blade 27 to drive the sleeve 1301 to slide on the outside of the mounting seat 1308, and the cutting blade 27 is disassembled for replacement. The replaced cutting blade 27 and the sleeve 1301 are sleeved on the outside of the mounting seat 1308, and the hexagonal block 1302 is rotated in the opposite direction, so that the screw sleeve 1306 drives the pushing block 1303 to push the pressure strip 1304 to flip, so that the pressure strip 1304 is against the sleeve 1301, and the position of the sleeve 1301 and the cutting blade 27 is fixed.

[0069] The MCH green product of the present invention has a sintering shrinkage of 14.1% to 14.5% at a temperature of 1610° C. to 1630° C. and a density of 3.81 g / cm³ to 3.87 g / cm³. The MCH obtained by screen printing the required circuits and then firing has a withstand voltage of 4500 V / 1S and a leakage current of less than 0.5 mA.

[0070] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A process for preparing MCH embryos, characterized in that: The steps include: S1: mixing and grinding raw material powders, pouring the raw material powders into the first mixer (1) in a certain proportion to mix them evenly, and grinding them to a certain fineness in the turbine nano sand mill (2); S2: Premixing and adjusting the material-to-ball ratio: placing the ground material into the second mixer (3) for premixing and adjusting the material-to-ball ratio; S3: Degassing and casting viscosity control, the premixed slurry is placed in a vacuum degassing machine (4) for degassing, and the casting viscosity is controlled according to the thickness and temperature; S4: tape casting and control of blade height and speed, the deaerated slurry is passed through the tape casting machine (5) for tape casting, and the blade height and casting speed are controlled according to the green body thickness and casting speed; S5: Cut and age the green sheet after tape casting as needed.

2. The MCH green embryo preparation process according to claim 1, wherein: In step S2, the sanding time of the turbine nano sand mill (2) is 50 min to 70 min, and the particle size of the sanding slurry is 2.1 μm to 2.35 μm.

3. The MCH green embryo preparation process according to claim 1, wherein: In step S3, the maximum rotation speed of the vacuum degassing machine (4) during degassing is 40 rpm, the rotation speed during aging is 9±1 rpm, and the vacuum degree is -0.09 to -0.1 MPa.

4. The MCH green embryo preparation process according to claim 1, wherein: The casting machine (5) in step S4 includes a winding frame (8) installed on both sides of the casting machine (5), a casting film (9) wound on the outside of the winding frame (8), a starting motor (21) installed at the bottom end of the casting machine (5), a material trough (20) fixed at the top of one side of the casting machine (5), a hopper (19) installed at the top of the material trough (20), a first pneumatic telescopic rod (18) installed at one side of the material trough (20), a casting knife (17) fixed at the telescopic end of the first pneumatic telescopic rod (18) and sliding on one side of the material trough (20), a drying chamber (16) installed at the top of the casting machine (5), an infrared heater (28) installed at the top of the drying chamber (16), a first tensioning roller (15) installed at the top of the casting machine (5), and a hopper (19) installed at the top of the material trough (20). A second tensioning roller (7) is provided at the bottom end of the roller (15) and is rotatably connected to the casting machine (5); a separation roller (30) is provided on one side of the bottom end of the first tensioning roller (15) and is rotatably connected to the casting machine (5); a guide roller (29) is rotatably connected to the inside of one side of the casting machine (5); a guide plate (26) slides on the outside of the guide roller (29); a moving structure (11) is provided on one side of the inside of the casting machine (5) and is connected to the guide plate (26); a cutting structure (12) is provided on one side of the moving structure (11); a loading and unloading structure (13) is provided on one side of the cutting structure (12); a cutting knife (27) is installed on one side of the loading and unloading structure (13) and is connected to the second tensioning roller (7); and an alumina ceramic green material belt (14) is provided on the top of the guide roller (29).

5. The MCH green body preparation process according to claim 4, characterized in that: The starting motor (21) is connected to the winding frame (8) via a first transmission belt (22), the first tensioning roller (15) is connected to one group of the winding frames (8) via a second transmission belt (23), one group of the guide rollers (29) is connected to the first tensioning roller (15) via a third transmission belt (24), and the two groups of the guide rollers (29) are connected via a transmission gear (10).

6. The MCH green body preparation process according to claim 4, characterized in that: The movable structure (11) comprises a fixed seat (1102) fixed at the bottom end of the interior of the casting machine (5), guide rods (1101) fixed at both sides of the fixed seat (1102), a movable seat (1104) sliding on the outside of the guide rods (1101), a first connecting frame (1105) fixed at the top of the movable seat (1104) and the fixed seat (1102) and connected to the guide plate (26), a folding frame (1108) installed on one side of the fixed seat (1102) and the movable seat (1104), a movable column (1107) rotatably connected to the bottom end of the interior of the folding frame (1108), a guide groove (1106) provided in the interior of the fixed seat (1102) and the movable seat (1104) and slidably connected to the movable column (1107), and a second pneumatic telescopic rod (1103) rotatably connected to the bottom end of one side of the folding frame (1108).

7. The MCH green body preparation process according to claim 4, characterized in that: The cutting structure (12) comprises a transmission shaft (1203) rotatably connected to the bottom end of the inner portion of the casting machine (5), a first transmission wheel (1202) fixed at one end of the transmission shaft (1203), a fourth transmission belt (25) sleeved on the outside of the first transmission wheel (1202) and connected to the guide roller (29), guide rails (1207) fixed at both ends of the transmission shaft (1203), a sliding sleeve (1208) sliding on the guide rail (1207) and the outside of the transmission shaft (1203), and a fourth transmission belt (25) fixed on the sliding sleeve (1208). 208), a third transmission wheel (1209) on the outside of the sliding sleeve (1208), a second connecting frame (1201) rotatably connected to one side of the sliding sleeve (1208) and connected to the movable seat (1104) and the fixed seat (1102), a rotating shaft (1204) rotatably connected to the inside of one side of the second connecting frame (1201), a second transmission wheel (1205) installed on the outside of the rotating shaft (1204), and a fifth transmission belt (1206) sleeved on the outside of the second transmission wheel (1205) and the third transmission wheel (1209).

8. The MCH green body preparation process according to claim 7, characterized in that: The transmission shaft (1203) passes through the second connecting frame (1201) and is connected to the sliding sleeve (1208), and the sliding sleeves (1208) are distributed at equal intervals on the outside of the transmission shaft (1203).

9. The MCH green body preparation process according to claim 4, characterized in that: The loading and unloading structure (13) comprises a limit plate (1307) mounted on one side of the rotating shaft (1204), a mounting seat (1308) mounted on one side of the limit plate (1307), a sleeve (1301) sliding on the outside of the mounting seat (1308) and connected to the cutting knife (27), a screw (1305) rotatably connected to one side of the interior of the mounting seat (1308), an inner hexagonal block (1302) fixed to one side of the screw (1305), a screw threadedly connected to the screw (1301), and a screw threadedly connected to the screw (1301). 305), a screw sleeve (1306) on the outside of the screw sleeve (1306), a push block (1303) fixed on the outside of the screw sleeve (1306), and a pressure strip (1304) rotatably connected to the inside of the mounting seat (1308), the front cross-section of the mounting seat (1308) is designed in a cross-shaped structure, and a hole groove matching the shape of the mounting seat (1308) is opened inside the housing (1301), and a torsion spring is installed between the pressure strip (1304) and the mounting seat (1308).

10. The MCH green body preparation process according to any one of claims 1 to 9, characterized in that: The sintering shrinkage of MCH green products at a temperature of 1610℃~1630℃ is 14.1%~14.5%, and the density is 3.81g / cm³~3.87g / cm³.

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