CN113372102A - Method for preparing alumina substrate from ultrafine alumina powder and preparation production line - Google Patents
Method for preparing alumina substrate from ultrafine alumina powder and preparation production line Download PDFInfo
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- CN113372102A CN113372102A CN202110787180.2A CN202110787180A CN113372102A CN 113372102 A CN113372102 A CN 113372102A CN 202110787180 A CN202110787180 A CN 202110787180A CN 113372102 A CN113372102 A CN 113372102A
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- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000000843 powder Substances 0.000 title claims abstract description 37
- 239000000758 substrate Substances 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 238000003756 stirring Methods 0.000 claims abstract description 59
- 239000002002 slurry Substances 0.000 claims abstract description 42
- 238000007790 scraping Methods 0.000 claims abstract description 20
- 238000004140 cleaning Methods 0.000 claims abstract description 13
- 238000007599 discharging Methods 0.000 claims description 23
- 239000006185 dispersion Substances 0.000 claims description 15
- 238000005245 sintering Methods 0.000 claims description 13
- 239000000654 additive Substances 0.000 claims description 12
- 230000000996 additive effect Effects 0.000 claims description 12
- 239000012752 auxiliary agent Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000005266 casting Methods 0.000 claims description 10
- 238000010345 tape casting Methods 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 9
- 229910021641 deionized water Inorganic materials 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 7
- 238000007789 sealing Methods 0.000 claims description 7
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- DOIRQSBPFJWKBE-UHFFFAOYSA-N dibutyl phthalate Chemical compound CCCCOC(=O)C1=CC=CC=C1C(=O)OCCCC DOIRQSBPFJWKBE-UHFFFAOYSA-N 0.000 claims description 6
- FLKPEMZONWLCSK-UHFFFAOYSA-N diethyl phthalate Chemical compound CCOC(=O)C1=CC=CC=C1C(=O)OCC FLKPEMZONWLCSK-UHFFFAOYSA-N 0.000 claims description 6
- WGTYBPLFGIVFAS-UHFFFAOYSA-M tetramethylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C WGTYBPLFGIVFAS-UHFFFAOYSA-M 0.000 claims description 6
- 238000005303 weighing Methods 0.000 claims description 6
- 238000005520 cutting process Methods 0.000 claims description 4
- 239000002270 dispersing agent Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 3
- KWYHDKDOAIKMQN-UHFFFAOYSA-N N,N,N',N'-tetramethylethylenediamine Chemical compound CN(C)CCN(C)C KWYHDKDOAIKMQN-UHFFFAOYSA-N 0.000 claims description 3
- 229910019142 PO4 Inorganic materials 0.000 claims description 3
- 229920002125 Sokalan® Polymers 0.000 claims description 3
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 3
- BAECOWNUKCLBPZ-HIUWNOOHSA-N Triolein Natural products O([C@H](OCC(=O)CCCCCCC/C=C\CCCCCCCC)COC(=O)CCCCCCC/C=C\CCCCCCCC)C(=O)CCCCCCC/C=C\CCCCCCCC BAECOWNUKCLBPZ-HIUWNOOHSA-N 0.000 claims description 3
- PHYFQTYBJUILEZ-UHFFFAOYSA-N Trioleoylglycerol Natural products CCCCCCCCC=CCCCCCCCC(=O)OCC(OC(=O)CCCCCCCC=CCCCCCCCC)COC(=O)CCCCCCCC=CCCCCCCCC PHYFQTYBJUILEZ-UHFFFAOYSA-N 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 3
- 230000001070 adhesive effect Effects 0.000 claims description 3
- 229910001870 ammonium persulfate Inorganic materials 0.000 claims description 3
- 238000000498 ball milling Methods 0.000 claims description 3
- 239000004359 castor oil Substances 0.000 claims description 3
- 235000019438 castor oil Nutrition 0.000 claims description 3
- 238000001914 filtration Methods 0.000 claims description 3
- ZEMPKEQAKRGZGQ-XOQCFJPHSA-N glycerol triricinoleate Natural products CCCCCC[C@@H](O)CC=CCCCCCCCC(=O)OC[C@@H](COC(=O)CCCCCCCC=CC[C@@H](O)CCCCCC)OC(=O)CCCCCCCC=CC[C@H](O)CCCCCC ZEMPKEQAKRGZGQ-XOQCFJPHSA-N 0.000 claims description 3
- 239000000395 magnesium oxide Substances 0.000 claims description 3
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 3
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 239000010452 phosphate Substances 0.000 claims description 3
- -1 phosphate ester Chemical class 0.000 claims description 3
- 229920002037 poly(vinyl butyral) polymer Polymers 0.000 claims description 3
- 229920000058 polyacrylate Polymers 0.000 claims description 3
- 239000004584 polyacrylic acid Substances 0.000 claims description 3
- 238000004080 punching Methods 0.000 claims description 3
- 239000000454 talc Substances 0.000 claims description 3
- 229910052623 talc Inorganic materials 0.000 claims description 3
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 3
- PHYFQTYBJUILEZ-IUPFWZBJSA-N triolein Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)OCC(OC(=O)CCCCCCC\C=C/CCCCCCCC)COC(=O)CCCCCCC\C=C/CCCCCCCC PHYFQTYBJUILEZ-IUPFWZBJSA-N 0.000 claims description 3
- 229940117972 triolein Drugs 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 238000005086 pumping Methods 0.000 claims 1
- 230000000903 blocking effect Effects 0.000 abstract 1
- 239000007788 liquid Substances 0.000 description 12
- 241001233242 Lontra Species 0.000 description 9
- 230000000694 effects Effects 0.000 description 3
- 238000009950 felting Methods 0.000 description 3
- 238000001035 drying Methods 0.000 description 2
- 238000003475 lamination Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 238000007766 curtain coating Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- RSMUVYRMZCOLBH-UHFFFAOYSA-N metsulfuron methyl Chemical compound COC(=O)C1=CC=CC=C1S(=O)(=O)NC(=O)NC1=NC(C)=NC(OC)=N1 RSMUVYRMZCOLBH-UHFFFAOYSA-N 0.000 description 1
- 239000004014 plasticizer Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 235000013547 stew Nutrition 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3205—Alkaline earth oxides or oxide forming salts thereof, e.g. beryllium oxide
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3231—Refractory metal oxides, their mixed metal oxides, or oxide-forming salts thereof
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- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3427—Silicates other than clay, e.g. water glass
- C04B2235/3436—Alkaline earth metal silicates, e.g. barium silicate
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- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6025—Tape casting, e.g. with a doctor blade
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Abstract
The invention relates to the technical field of alumina substrate preparation, in particular to a method for preparing an alumina substrate by using ultra-fine alumina powder and a preparation production line, which comprises the following steps: s1, S2, S3 and S4. The invention has an integrated stirring and defoaming component, and has a cleaning brush for cleaning, which can improve defoaming efficiency, an inner barrel and an annular screen plate are arranged in a barrel body, and the defoaming component is arranged on the inner barrel and the screen plate, a stirring shaft, a scraping frame and a stirring rod can be driven by a speed reduction motor to stir slurry in the inner barrel, so that large bubbles in the slurry are stirred out, the stirred large bubbles are broken under the action of a vacuum air pump, when the stirring shaft drives an arc-shaped strip to rotate, the arc-shaped strip can drive a thorn needle and the cleaning brush on the arc-shaped strip to rotate, the thorn needle can puncture small bubbles on the screen plate, and the cleaning brush can clean the surface of the screen plate at the same time, so that the slurry is prevented from blocking the screen plate.
Description
Technical Field
The invention relates to the technical field of alumina substrate preparation, in particular to a method for preparing an alumina substrate from ultra-fine alumina powder and a preparation production line.
Background
The tape casting is also called as belt casting method and scraper method, and is a mature molding method capable of obtaining high-quality and ultra-thin substrate blanks, and the process comprises the procedures of slurry preparation, tape casting, drying, sintering and the like, wherein the most important is the preparation of the slurry and the control of the tape casting process. Casting slurry is a relatively complex system, and the slurry generally consists of powder, solvent, dispersant, binder, plasticizer and functional additives. A suitable casting slurry must satisfy the following conditions: (1) no defects (such as cracks and the like) exist in the drying process; (2) the casting sheet has certain strength after being dried, such as cutting, drilling and the like; (3) the tape-cast sheet has a very uniform microstructure and a smooth and flat surface; (4) organic matters in the tape casting sheet can be completely removed after thermal decomposition; (5) the casting sheet has good lamination performance and can be used for a lamination process; (6) the casting sheet is required to have excellent sintering property and the like.
The thick liquids material just need sieve ratio and stirring after preparing fully, and prior art adopts artifical batching then to put into the machine and stirs mostly, but thick liquids can produce more bubble at the stirring in-process, and the existence of bubble can influence the effect of curtain coating, leads to fashioned substrate surface uneven, and the quality is not high, simultaneously because thick liquids have certain viscosity, causes the jam easily removing the bubble in-process, reduces and removes bubble efficiency.
Therefore, it is necessary to design a method and a production line for preparing an alumina substrate from ultra-fine alumina powder to solve the above problems.
Disclosure of Invention
The invention aims to provide a method for preparing an alumina substrate from ultra-fine alumina powder and a preparation production line, which aim to solve the problem that the slurry proposed in the background art is easy to generate more bubbles before casting molding.
In order to achieve the purpose, the invention provides the following technical scheme: the method for preparing the alumina substrate by using the ultra-fine alumina powder comprises the following steps:
s1, weighing and mixing alumina raw material powder with the particle size of 0.1-4um, deionized water, an additive and an auxiliary agent according to a proportion, adding the mixture into a high-speed dispersion machine, adding a dispersing agent for pre-dispersion, adding the mixture into a ball mill for ball milling for 24-36 h after dispersion to prepare alumina slurry, wherein the alumina slurry is prepared by weighing and mixing the following components in proportion: every 100g of alumina raw material powder respectively corresponds to 70-200g of deionized water, the first weight part of additive and the second weight part of auxiliary agent.
S2, filtering the alumina slurry through 3000-10000 meshes, adding the filtered alumina slurry into a vacuum defoaming device, and defoaming at-0.01-0.15 MPa to obtain the casting slurry with the viscosity of 20000-25000 mPa & s.
And S3, carrying out tape casting on the alumina slurry to obtain a substrate blank, punching and cutting the substrate blank into a certain shape by using a die, and then coating a layer of adhesive powder to obtain a blank sheet.
And S4, sintering and flattening the blank sheet in the S3 to obtain the alumina substrate.
Preferably, the additive in S1 comprises at least one of the following components: polyvinyl butyral, castor oil, phosphate ester, dibutyl phthalate, triolein and diethyl phthalate, wherein the weight ratio of the additive in the first weight part to the alumina raw material powder is (0.5-8): 100.
preferably, the auxiliary agent in S1 includes at least one of the following components: talc, titanium oxide, magnesium oxide, polyacrylic acid, ammonium polyacrylate, ammonium persulfate, tetramethylethylenediamine and tetramethylammonium hydroxide, wherein the weight ratio of the auxiliary agent in the second weight part to the deionized water is as follows: 0.5-2: 70-200.
Preferably, the sintering temperature in S4 is non-pressure sintering in a high-temperature kiln at 1600-1630 ℃, and the high-temperature heat preservation is carried out for 2.5-5 h.
The production line for preparing the alumina substrate from the ultra-fine alumina powder comprises a high-speed dispersion machine, wherein an outlet of the high-speed dispersion machine is sequentially connected with a ball mill, a vacuum bubble removing device, a tape casting device, a powder coating device, a sintering device and a leveling device, the vacuum bubble removing device comprises a mounting plate, a vacuum air pump and a barrel body, supporting columns are fixedly connected at four corners of the lower surface of the mounting plate, the vacuum air pump is fixedly connected to the left side of the upper surface of the mounting plate, the barrel body is fixedly connected to the middle of the right side of the mounting plate, an air exhaust end of the vacuum air pump is fixedly connected with the right side of the upper end of the barrel body through a communicating pipe, a top cover is fixedly connected to the top of the barrel body, a plurality of fixing blocks distributed in an annular array relative to the central axis of the barrel body are fixedly connected to the inner wall of the upper end of the barrel body, and one end, far away from the barrel body, of the plurality of fixing blocks is connected with the same inner barrel body through a nail, a screen plate is fixedly connected below the inner barrel and the inner wall of the barrel body.
Preferably, the transverse section of the screen plate is annular, the longitudinal section of the screen plate is conical, the aperture of a mesh on the screen plate is 0.1-0.2mm, the inner side of the screen plate is fixedly connected with a circular table, and bubble removing components are arranged on the circular table and the inner barrel.
Preferably, the defoaming assembly comprises a speed reduction motor, a stirring shaft, a plurality of fixing rings, four scraping frames, four groups of stirring rods, a sealing bearing, a conical table, four arc-shaped strips and a plurality of thorn needles, the speed reduction motor is fixedly connected to the middle of the upper surface of the top cover, the output end of the speed reduction motor penetrates through the top cover through a rotating shaft and extends to the inside of the barrel body, the top end of the stirring shaft is fixedly connected with the rotating shaft, the bottom end of the stirring shaft penetrates through the middle of the inner bottom wall of the inner barrel and extends to the middle of the circular table, the bottom end of the stirring shaft is rotatably connected with the circular table through the sealing bearing, the conical table is fixedly connected to the outer side of the stirring shaft and the conical table is located above the circular table, and the four arc-shaped strips are fixedly connected to the outer circumferential surface of the conical table in an annular array relative to the central axis of the conical table.
Preferably, the fixing rings are sequentially and fixedly connected to the outer circumferential surface of the stirring shaft from top to bottom, a gap is reserved between the lowermost fixing ring and the inner bottom wall of the inner barrel, the section of the scraping frame is in an L shape, two ends of the scraping frame are respectively and fixedly connected with the uppermost fixing ring and the lowermost fixing ring, the scraping frame is matched with the inner barrel, the four scraping frames are distributed in an annular array relative to the central axis of the stirring shaft, four groups of stirring rods are respectively fixed to the corresponding fixing rings, and each group of stirring rods comprises four stirring rods distributed in an annular array.
Preferably, the upper surface of the top cover is fixedly connected with a feeding pipe communicated with the inside of the barrel body and positioned on the right side of the speed reduction motor, a pipe plug is hinged to the top of the feeding pipe, a plurality of first discharging pipes are fixedly connected to the bottom of the inner barrel and close to the outer circumferential surface of the inner barrel, the first discharging pipes are distributed in an annular array mode relative to the central axis of the inner barrel, the first discharging pipes are positioned above one end of the arc-shaped strip, the bottom end of the barrel body is arranged in a conical mode, a second discharging pipe communicated with the barrel body is fixed to the bottom of the barrel body, and electromagnetic valves are mounted inside the first discharging pipes and inside the second discharging pipes.
Compared with the prior art, the invention has the beneficial effects that: the method for preparing the alumina substrate by using the ultrafine alumina powder and the preparation production line have an integrated stirring and defoaming assembly and a cleaning brush for cleaning, so that the defoaming efficiency can be improved.
Through bucket and annular otter board in setting up in the staving, and set up on interior bucket and otter board and remove the bubble subassembly, can drive the (mixing) shaft through gear motor, strike off frame and puddler and mix the thick liquids in to interior bucket, make the big bubble in the thick liquids stir out, and under the effect of vacuum air pump, make the atmospheric pressure in the ladle body reduce, make the great bubble of stirring out broken, when the (mixing) shaft drives arc strip and rotates, arc strip can drive the thorn felting needle above that and clear away the brush and rotate, the thorn needle can puncture the less bubble on the otter board, clear away the brush simultaneously and can clear away the otter board surface, avoid thick liquids to block up the otter board.
Drawings
FIG. 1 is a schematic view of the entire structure of the present invention;
FIG. 2 is a schematic front view of the structure of the present invention;
FIG. 3 is a front cross-sectional view of the present invention;
FIG. 4 is a schematic view of a bubble removal assembly of the present invention;
FIG. 5 is an enlarged view taken at A in FIG. 3 according to the present invention;
FIG. 6 is an enlarged view of the position B in FIG. 4 according to the present invention.
In the figure: 1. mounting a plate; 2. a vacuum pump; 3. a barrel body; 4. a communicating pipe; 5. a top cover; 6. a fixed block; 7. an inner barrel; 8. a screen plate; 9. a circular table; 10. sealing the sealed bearing; 11. a conical table; 12. an arc-shaped strip; 13. a cleaning brush; 14. a ratchet needle; 15. a reduction motor; 16. a stirring shaft; 17. a fixing ring; 18. scraping the frame; 19. a stirring rod; 20. a feed pipe; 21. a first discharge pipe; 22. a second discharge pipe; 23. and (4) a support column.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, a method for preparing an alumina substrate from ultrafine alumina powder comprises the following steps:
s1, weighing and mixing alumina raw material powder with the particle size of 0.1-4um, deionized water, an additive and an auxiliary agent according to a proportion, adding the mixture into a high-speed dispersion machine, adding a dispersing agent for pre-dispersion, adding the mixture into a ball mill for ball milling for 24-36 h after dispersion to prepare alumina slurry, wherein the alumina slurry is prepared by weighing and mixing the following components in proportion: every 100g of alumina raw material powder respectively corresponds to 70-200g of deionized water, the first weight part of additive and the second weight part of auxiliary agent.
S2, filtering the alumina slurry through 3000-10000 meshes, adding the filtered alumina slurry into a vacuum defoaming device, and defoaming at-0.01-0.15 MPa to obtain the casting slurry with the viscosity of 20000-25000 mPa & s.
And S3, carrying out tape casting on the alumina slurry to obtain a substrate blank, punching and cutting the substrate blank into a certain shape by using a die, and then coating a layer of adhesive powder to obtain a blank sheet.
S4, sintering and flattening the blank sheet in the step S3 to obtain the alumina substrate
Further, the additive in S1 includes at least one of the following components: polyvinyl butyral, castor oil, phosphate ester, dibutyl phthalate, triolein and diethyl phthalate, wherein the weight ratio of the additive in the first weight part to the alumina raw material powder is 0.5-8: 100
Further, the auxiliary agent in S1 includes at least one of the following components: talc, titanium oxide, magnesium oxide, polyacrylic acid, ammonium polyacrylate, ammonium persulfate, tetramethylethylenediamine and tetramethylammonium hydroxide, wherein the weight ratio of the auxiliary agent in the second weight part to the deionized water is as follows: 0.5-2: 70-200
Further, sintering at the sintering temperature of 1600-1630 ℃ in S4 without pressure in a high-temperature kiln, and preserving heat at high temperature for 2.5-5 h.
Preparation production line for preparing alumina substrate from ultra-fine alumina powder, which comprises a high-speed dispersion machine, the outlet of the high-speed dispersion machine is sequentially connected with a ball mill, a vacuum defoaming device, a tape casting device, a powder coating device, a sintering device and a leveling device, the vacuum defoaming device comprises a mounting plate 1, a vacuum air pump 2 and a barrel body 3, the four corners of the lower surface of the mounting plate 1 are respectively and fixedly connected with a supporting column 23, the vacuum air pump 2 is fixedly connected to the left side of the upper surface of the mounting plate 1, the barrel body 3 is fixedly connected to the middle of the right side of the mounting plate 1, the air exhaust end of the vacuum air pump 2 is fixedly connected with the right side of the upper end of the barrel body 3 through a communicating pipe 4, the vacuum air pump 2 is used for vacuumizing the interior of the barrel body 3, the slurry is broken by larger air bubbles and the bubble generation probability is reduced in the stirring process, the top of the barrel body 3 is fixedly connected with a top cover 5, and the inner wall of the upper end of the barrel body 3 is fixedly connected with a plurality of fixed balls which are distributed in an annular array on the central axis of the barrel body 3 The fixed block 6, the one end that the body 3 was kept away from to a plurality of fixed blocks 6 is connected with same interior bucket 7 through the nail, the below of interior bucket 7 and with the inner wall fixedly connected with otter board 8 of body 3, interior bucket 7 links to each other with body 3 through fixed block 6, the top of interior bucket 7 and top cap 5 contactless, there is the space between messenger interior bucket 7 and the body 3, be convenient for vacuum air pump 2 to carry out the evacuation in the body 3 and interior bucket 7.
Further, as shown in fig. 1, the transverse section of the screen plate 8 is annular, the longitudinal section of the screen plate 8 is conical, the aperture of the mesh on the screen plate 8 is 0.1-0.2mm, the inner side of the screen plate 8 is fixedly connected with a circular table 9, the upper part of the circular table 9 and the inner barrel 7 are provided with bubble removing components, and the screen plate 8 inclines inwards and downwards, so that the slurry and smaller bubbles in the slurry can be conveniently separated.
Further, as shown in fig. 2, the bubble removing assembly includes a speed reducing motor 15, a stirring shaft 16, a plurality of fixing rings 17, four scraping frames 18, four groups of stirring rods 19, a sealing bearing 10, a conical table 11, four arc-shaped bars 12 and a plurality of barbed needles 14, the speed reducing motor 15 is fixedly connected to the middle of the upper surface of the top cover 5, the output end of the speed reducing motor 15 penetrates through the top cover 5 through a rotating shaft and extends to the inside of the barrel body 3, the top end of the stirring shaft 16 is fixedly connected with the rotating shaft, the bottom end of the stirring shaft 16 penetrates through the middle of the inner bottom wall of the inner barrel 7 and extends to the middle of the circular table 9, the bottom end of the stirring shaft 16 is rotatably connected with the circular table 9 through the sealing bearing 10, the conical table 11 is fixedly connected to the outer side of the stirring shaft 16 and the conical table 11 is located above the circular table 9, the four arc-shaped bars 12 are fixedly connected to the outer circumferential surface of the conical table 11 in an annular array with respect to the central axis of the conical table 11, gear motor 15 can drive (mixing) shaft 16 and rotate in circular platform 9 through sealed bearing 10 when rotating, and at the rotation in-process, (mixing) shaft 16 can drive simultaneously and strike off frame 18, (mixing) shaft 16, toper platform 11 and arc strip 12 and rotate.
Further, as shown in fig. 2 and 4, a plurality of fixing rings 17 are sequentially and fixedly connected to the outer circumferential surface of the stirring shaft 16 from top to bottom, a gap is left between the lowermost fixing ring 17 and the inner bottom wall of the inner barrel 7, the cross section of the scraping frame 18 is L-shaped, two ends of the scraping frame 18 are respectively and fixedly connected with the uppermost fixing ring 17 and the lowermost fixing ring 17, the scraping frame 18 is adapted to the inner barrel 7, four scraping frames 18 are distributed in an annular array about the central axis of the stirring shaft 16, four groups of stirring rods 19 are respectively fixed on the corresponding fixing rings 17, each group of stirring rods 19 comprises four stirring rods 19 distributed in an annular array, the speed reducing motor 15 rotates and drives the stirring shaft 16 to rotate, the stirring shaft 16 drives the scraping frames 18 to scrape the inner wall of the inner barrel 7 through the fixing rings 17 to prevent the slurry from adhering to the inner wall, the stirring shaft 16 mixes the slurry and stirs out bubbles carried in the slurry, the defoaming efficiency is improved.
Further, as shown in fig. 2, 4 and 5, the non-arc-shaped surface of the arc-shaped strip 12 is fixedly connected with a cleaning brush 13, one end of the cleaning brush 13, which is far away from the arc-shaped strip 12, is contacted with the top of the screen plate 8, the plurality of barbed needles 14 are uniformly and fixedly connected onto the arc-shaped surface of the arc-shaped strip 12, the stirring shaft 16 can drive the arc-shaped strip 12 to rotate through the tapered table 11, meanwhile, the arc-shaped strip 12 drives the cleaning brush 13 and the barbed needles 14 to rotate, so that the cleaning brush 13 brushes the surface of the screen plate 8, slurry blockage is avoided, meanwhile, the barbed needles 14 puncture smaller bubbles, and the bubble removal efficiency is improved.
Further, as shown in fig. 2, 4 and 5, a feeding pipe 20 communicated with the inside of the barrel body 3 is fixedly connected to the upper surface of the top cover 5 and located on the right side of the speed reduction motor 15, a stopcock is hinged to the top of the feeding pipe 20, a plurality of first discharging pipes 21 are fixedly connected to the bottom of the inner barrel 7 and close to the outer circumferential surface of the inner barrel 7, the plurality of first discharging pipes 21 are distributed in an annular array around the central axis of the inner barrel 7, the plurality of first discharging pipes 21 are located above one end of the arc-shaped strip 12, the bottom end of the barrel body 3 is arranged in a conical shape, a second discharging pipe 22 communicated with the bottom of the barrel body 3 is fixed to the bottom of the barrel body 3, electromagnetic valves are mounted inside the first discharging pipes 21 and inside the second discharging pipe 22, the stopcock on the feeding pipe 20 and the electromagnetic valve on the second discharging pipe 22 can seal the inside of the barrel body 3 to prevent air leakage, and the plurality of first discharging pipes 21 increase the discharging rate of the slurry with a certain viscosity in the inner barrel body 7, the defoaming efficiency is improved.
The working principle is as follows: when the device is used, a pipe plug on the feeding pipe 20 is opened, filtered slurry is added through the feeding pipe 20, the slurry enters the inner barrel 7, the pipe plug is closed, the vacuum air pump 2 and the speed reducing motor 15 are started through a controller (not shown), the vacuum air pump 2 pumps gas in the barrel body 3, the speed reducing motor 15 rotates and drives the stirring shaft 16 to rotate, the stirring shaft 16 drives the scraping frame 18 and the stirring rod 19 on the stirring shaft to rotate, the scraping frame 18 can scrape the slurry on the inner wall of the inner barrel 7, the stirring rod 19 can stir the slurry, larger bubbles in the slurry are stirred out, the larger bubbles can be broken under the action of the vacuum air pump 2, but some smaller bubbles can still be mixed in the slurry, the electromagnetic valve (not shown) on the first discharging pipe 21 is opened, the slurry is discharged onto the screen plate 8 through the first discharging pipe 21, and the screen plate 8 inclines downwards, make the thick liquids can flow to the center under the effect of gravity, thick liquids are when flowing, the thick liquids that do not have the bubble fall into ladle body 3's bottom along otter board 8, and stew, wherein less bubble can be held back by otter board 8, simultaneously (mixing) shaft 16 can drive toper platform 11 and rotate, toper platform 11 drives arc strip 12 and rotates simultaneously, make arc strip 12 drive and clear away brush 13 and thorn felting needle 14 and rotate, it can brush off the otter board 8 surface to clear away brush 13, avoid thick liquids to block up, simultaneously thorn felting needle 14 can puncture less bubble in the thick liquids when rotating, under the dual function of vacuum aspiration pump 2, make less bubble in the thick liquids eliminated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The method for preparing the alumina substrate by using the ultra-fine alumina powder comprises the following steps:
s1, weighing and mixing alumina raw material powder with the particle size of 0.1-4um, deionized water, an additive and an auxiliary agent according to a proportion, adding the mixture into a high-speed dispersion machine, adding a dispersing agent for pre-dispersion, adding the mixture into a ball mill for ball milling for 24-36 h after dispersion to prepare alumina slurry, wherein the alumina slurry is prepared by weighing and mixing the following components in proportion: every 100g of alumina raw material powder respectively corresponds to 70-200g of deionized water, a first weight part of additive and a second weight part of auxiliary agent;
s2, filtering the alumina slurry through 3000-10000 meshes, adding the filtered alumina slurry into a vacuum defoaming device, and defoaming at-0.01-0.15 MPa to obtain casting slurry with the viscosity of 20000-25000 mPa & s;
s3, carrying out tape casting on the alumina slurry to obtain a substrate blank, punching and cutting the substrate blank into a certain shape by using a die, and then coating a layer of adhesive powder to obtain a blank sheet;
and S4, sintering and flattening the blank sheet in the S3 to obtain the alumina substrate.
2. The method for producing an alumina substrate from ultrafine alumina powder according to claim 1, wherein: the additive in S1 comprises at least one of the following components: polyvinyl butyral, castor oil, phosphate ester, dibutyl phthalate, triolein and diethyl phthalate, wherein the weight ratio of the additive in the first weight part to the alumina raw material powder is (0.5-8): 100.
3. the method for producing an alumina substrate from ultrafine alumina powder according to claim 1, wherein: the auxiliary agent in S1 comprises at least one of the following components: talc, titanium oxide, magnesium oxide, polyacrylic acid, ammonium polyacrylate, ammonium persulfate, tetramethylethylenediamine and tetramethylammonium hydroxide, wherein the weight ratio of the auxiliary agent in the second weight part to the deionized water is as follows: 0.5-2: 70-200.
4. The method for producing an alumina substrate from ultrafine alumina powder according to claim 1, wherein: and in the S4, sintering is carried out in a high-temperature kiln at 1600-1630 ℃ without pressure, and high-temperature heat preservation is carried out for 2.5-5 h.
5. The production line for preparing the alumina substrate from the superfine alumina powder is characterized by comprising a high-speed dispersion machine, wherein an outlet of the high-speed dispersion machine is sequentially connected with a ball mill, a vacuum defoaming device, a tape casting forming device, a powder coating device, a sintering device and a leveling device, the vacuum defoaming device comprises a mounting plate (1), a vacuum air pump (2) and a barrel body (3), and the production line is characterized in that: the improved barrel is characterized in that support columns (23) are fixedly connected to four corners of the lower surface of the mounting plate (1), the vacuum air pump (2) is fixedly connected to the left side of the upper surface of the mounting plate (1), the barrel body (3) is fixedly connected to the middle of the right side of the mounting plate (1), an air pumping end of the vacuum air pump (2) is fixedly connected to the right side of the upper end of the barrel body (3) through a communicating pipe (4), a top cover (5) is fixedly connected to the top of the barrel body (3), a plurality of fixing blocks (6) distributed in an annular array mode about the central axis of the barrel body (3) are fixedly connected to the inner wall of the upper end of the barrel body (3), one ends, far away from the barrel body (3), of the fixing blocks (6) are connected to an inner barrel (7) through nails, and a mesh plate (8) is fixedly connected to the lower portion of the inner barrel (7) and the inner wall of the barrel body (3).
6. The production line for producing an alumina substrate from an ultrafine alumina powder according to claim 5, comprising: the transverse section of the screen plate (8) is annular, the longitudinal section of the screen plate (8) is conical, the aperture of meshes on the screen plate (8) is 0.1-0.2mm, a circular table (9) is fixedly connected to the inner side of the screen plate (8), and bubble removing components are arranged on the circular table (9) and the inner barrel (7).
7. The method for producing an alumina substrate from ultrafine alumina powder according to claim 5, wherein: the defoaming assembly comprises a speed reducing motor (15), a stirring shaft (16), a plurality of fixing rings (17), four scraping frames (18), four groups of stirring rods (19), a sealing bearing (10), a conical table (11), four arc-shaped strips (12) and a plurality of thorn puncture needles (14), wherein the speed reducing motor (15) is fixedly connected to the middle part of the upper surface of the top cover (5), the output end of the speed reducing motor (15) penetrates through the top cover (5) through a rotating shaft and extends to the inside of the barrel body (3), the top end of the stirring shaft (16) is fixedly connected with the rotating shaft, the bottom end of the stirring shaft (16) penetrates through the middle part of the inner bottom wall of the inner barrel (7) and extends to the middle part of the circular table (9), the bottom end of the stirring shaft (16) is rotatably connected with the circular table (9) through the sealing bearing (10), the conical table (11) is fixedly connected to the outer side of the stirring shaft (16), and the conical table (11) is positioned above the circular table (9), the four arc strips (12) are fixedly connected to the outer circumferential surface of the conical table (11) in an annular array relative to the central axis of the conical table (11).
8. The method for producing an alumina substrate from ultrafine alumina powder according to claim 7, wherein: the stirring device is characterized in that the fixing rings (17) are sequentially and fixedly connected to the outer circumferential surface of the stirring shaft (16) from top to bottom, a gap is reserved between the lowest fixing ring (17) and the inner bottom wall of the inner barrel (7), the section of the scraping frame (18) is L-shaped, two ends of the scraping frame (18) are respectively and fixedly connected with the uppermost fixing ring (17) and the lowest fixing ring (17), the scraping frame (18) is matched with the inner barrel (7), the four scraping frames (18) are distributed in an annular array mode relative to the central axis of the stirring shaft (16), the four groups of stirring rods (19) are respectively fixed on the corresponding fixing rings (17), and each group of stirring rods (19) comprises four stirring rods (19) distributed in an annular array mode.
9. The method for producing an alumina substrate from ultrafine alumina powder according to claim 7, wherein: the non-arc-shaped surface of the arc-shaped strip (12) is fixedly connected with a cleaning brush (13), one end, far away from the arc-shaped strip (12), of the cleaning brush (13) is in contact with the top of the screen plate (8), and the plurality of barbed needles (14) are uniformly and fixedly connected to the arc-shaped surface of the arc-shaped strip (12).
10. The method for producing an alumina substrate from ultrafine alumina powder according to claim 5, wherein: the upper surface of the top cover (5) is located on the right side of the speed reduction motor (15), a feeding pipe (20) communicated with the inside of the barrel body (3) is fixedly connected with the upper surface of the top cover, a pipe plug is hinged to the top of the feeding pipe (20), a plurality of first discharging pipes (21) are fixedly connected to the bottom of the inner barrel (7) and close to the outer circumferential surface of the inner barrel (7), the first discharging pipes (21) are distributed in an annular array mode relative to the central axis of the inner barrel (7), the first discharging pipes (21) are located above one end of the arc-shaped strip (12), the bottom end of the barrel body (3) is arranged in a conical mode, second discharging pipes (22) communicated with the barrel body are fixed to the bottom of the barrel body (3), and electromagnetic valves are mounted inside the first discharging pipes (21) and inside the second discharging pipes (22).
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