CN107903043A - A kind of method of aluminium oxide ceramics tape casting - Google Patents
A kind of method of aluminium oxide ceramics tape casting Download PDFInfo
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- CN107903043A CN107903043A CN201711366282.7A CN201711366282A CN107903043A CN 107903043 A CN107903043 A CN 107903043A CN 201711366282 A CN201711366282 A CN 201711366282A CN 107903043 A CN107903043 A CN 107903043A
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- aluminium oxide
- oxide ceramics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/29—Producing shaped prefabricated articles from the material by profiling or strickling the material in open moulds or on moulding surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B17/00—Details of, or accessories for, apparatus for shaping the material; Auxiliary measures taken in connection with such shaping
- B28B17/02—Conditioning the material prior to shaping
- B28B17/026—Conditioning ceramic materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
Abstract
A kind of method of aluminium oxide ceramics tape casting, alumina ceramic powder is mixed in a solvent with dispersant, binding agent and plasticizer, forms the slurry of even stable suspension；Slurry is flow on base band from hopper lower part by casting machine again, forms base film；Then base film is sent into drying chamber drying together with base band again, carries out evaporation of the solvent, formation has some strength and flexible blank；Then can be by the cutting of required shape, punching or punching；Finally finished product is obtained by degreasing sintered；When base film is sent into drying chamber drying together with base band, protective atmosphere is passed through to drying chamber, reduces the rate of drying of base film strips upper surface；And during alumina ceramic powder mixes in a solvent with dispersant, binding agent and plasticizer improve casting slurry in alumina powder solid concentration, reduce solvent content, base substrate is easier drying；And low boiling point slow using rate of drying and the solvent that rate of drying is fast and boiling point is high at the same time in formula so that body drying is more uniform.
Description
Technical field
The present invention relates to a kind of production method of aluminium oxide ceramics, refers in particular to a kind of tape casting of aluminium oxide ceramics
Method, the tape casting method that the tape casting method of this kind of aluminium oxide ceramics can solve current aluminium oxide ceramics exist easily
The problem of cracking and uniformity are bad, is mainly used for the making processing of aluminium oxide ceramic substrate, belongs to aluminium oxide ceramics and make skill
Art field.
Background technology
Aluminium oxide ceramics is one kind with aluminium oxide（Al2O3）For the ceramic material of main body, for thick film integrated circuit.Oxidation
Aluminium ceramics have preferable conductibility, mechanical strength and heat-resisting quantity.It should be noted that it need to be washed with ultrasonic wave.Aluminium oxide
Ceramics are a kind of widely used ceramics, more and more extensive in the application of modern society because its superior performance, are met
In daily and property needs.
Aluminium oxide ceramic products forming method has dry-pressing, slip casting, extruding, isostatic cool pressing, injection, curtain coating, hot pressing and heat etc.
A variety of methods such as hydrostatic profile.Pressure filtration molding, Direct Coagulation Casting, gel was developed again both at home and abroad in recent years to form
The forming technique methods such as type, centrifugal grouting shaping and Solid Freeform.Different shape of product, size, complex model and essences
The product of degree needs different forming methods.Wherein, casting molding processes include slurry preparation, shaping, drying, stripping group band etc.
Process.The characteristics of technique is that equipment is simple, and process stabilizing, can operate continuously, and production efficiency height is, it can be achieved that increasingly automated.
Existing tape casting method makes aluminium oxide ceramics and is mainly used for making substrate class product, but is making relative thickness more
Thick（More than 1mm）During aluminium oxide ceramic substrate, it is easy to which cracking or uneven drying, its reason is main by analysis
Blank strip is thick when being due to curtain coating, and the rate of drying of upper and lower surface is inconsistent（Upper surface is usually first dried to polymer film, hinders base
Band internal solvent is volatilized）It is caused, therefore necessary this is solved.
By patent retrieval and do not find there be the patent literature constructed with the present invention, have certain relation with the present invention
Patent mainly have it is following：
1st, Patent No. CN98103410.1, the patent of invention of entitled " doctor blade process for preparing of ceramic substrate ", the patent
A kind of doctor blade process for preparing of ceramic substrate is disclosed, using nontoxic dimethylbenzene/absolute ethyl alcohol as mixed solvent, poly- second
Enol butyral (PVB) is used as binding agent, and dibutyl phthalate (DBP) (DBP) and polyethylene glycol (PEG) are used as plasticizer, fish
Oil, oleic acid or triglyceride (GTO) are used as dispersant, and tributyl phosphate, organic silicone oil or alcohol-based mixtures are as de-bubble
Agent etc..It is made after casting slurry and curtain coating blank is made again, ceramic substrate is made through drying, dumping, sintering.
2nd, Patent No. CN201510591221.5, it is entitled " have wireless charging function zirconia ceramics rear cover and
The patent of invention of its manufacture method ", which disclose a kind of zirconia ceramics rear cover and its system with wireless charging function
Method is made, the zirconia ceramics rear cover is compound on the zirconia ceramics backboard with being coated in by zirconia ceramics backboard
Slurry cofiring and the zirconia ceramics rear cover obtained, the composite mortar are formed and zirconia ceramics backboard one through sintering
The Wireless charging coil of change, wherein the raw material for preparing the composite mortar include silver powder 70~80% by weight percentage,
Graphene 2~5%, carbon nanotubes 3~8%, glass dust 15~20%.
3rd, Patent No. CN201610206078.8, entitled " a kind of silica flour curtain coating prepares the side of silicon nitride ceramic substrate
The patent of invention of method ", which disclose a kind of method that silica flour curtain coating prepares silicon nitride ceramic substrate, belongs to insulated substrate skill
Art field.The present invention using silica flour and without machine aided burn additive as raw material, using castor oil as dispersant, using polyvinyl butyral resin as
Bonding agent, according to the chemical state and particle size of silicon powder surface, adds the plasticizer for being conducive to silica flour tape casting, prepares
Thickness is adjustable, surface is smooth, flawless and imperforate large area green compact, by green compact after dumping, by high temperature sintering system
It is more than 50Wm-1K-1 for thermal conductivity is gone out, bending strength is more than 600MPa, and fracture toughness is more than the silicon nitride of 8MPam1/2
Ceramic substrate.
4th, Patent No. CN99119237.0, entitled " the quick solidification stream of electronic ceramics substrate and thin slice ceramic component
Prolong forming method " patent of invention, which disclose the quick solidification stream of a kind of electronic ceramics substrate and thin slice ceramic component
Prolong forming method, this method dissolves after first mixing organic monomer and crosslinking agent with water, is prepared into pre-mixing liquor；Then by ceramics
Powder adds pre-mixing liquor with dispersant, by prepared slurry ball milling mixing, vacuumizes de-bubble；Added in slurry after de-bubble
Initiator and catalyst, the tape casting on casting machine, curtain coating solidify afterwards shaping；Sintering 0 obtains finished product.
Although some has been related to tape casting method to these above-mentioned patents, is also all carried out to being cast molding production method
Improve, but do not suggest that the carving or engraving knife method for solving the problems, such as that aluminium oxide ceramics casting molding processes presently, there are, also without reference to
Aluminium oxide ceramic substrate is made using casting arrangement, therefore deficiency present in aluminium oxide ceramics manufacture is not solved
Certainly, therefore still need further to be improved.
The content of the invention
The problem of it is an object of the invention to in the presence of existing aluminium oxide ceramics tape casting manufacturing process, propose
A kind of new aluminium oxide ceramics tape casting method, the aluminium oxide ceramics tape casting can effectively eliminate aluminium oxide ceramics curtain coating
The problem of cracking and Density inhomogeneity in shaping.
In order to reach this purpose, the present invention provides a kind of method of aluminium oxide ceramics tape casting, aluminium oxide is made pottery
Porcelain powder mixes in a solvent with dispersant, binding agent and plasticizer, forms the slurry of even stable suspension；Pass through casting machine again
Slurry is flow on base band from hopper lower part, forms base film；Then base film is sent into drying chamber drying together with base band again,
Evaporation of the solvent is carried out, formation has some strength and flexible blank；Then can be by the cutting of required shape, punching or punching；
Finally finished product is obtained by degreasing sintered；Its feature is：When base film is sent into drying chamber drying together with base band, to drying
Room is passed through protective atmosphere, reduces the rate of drying of base film strips upper surface；And alumina ceramic powder and dispersant, binding agent and
Plasticizer improves the solid concentration of alumina powder in casting slurry in mixing in a solvent, reduce solvent content, make base substrate more
It is easily dry；And low boiling point slow using rate of drying and the solvent that rate of drying is fast and boiling point is high at the same time in formula so that base substrate
Drying is more uniform.
Further, the protective atmosphere that is passed through to drying chamber is to be closed drying chamber, and when drying base film,
By injection mode to being filled with protective gas in drying chamber so that the rate of drying control of base film reaches 90% when dry 4-5 is small
Degree of drying.
Further, the protective gas is inert gas, including nitrogen, helium or carbon dioxide；Indifferent gas
Bulk concentration is 80-90%.
Further, the alumina ceramic powder carries in being mixed in a solvent with dispersant, binding agent and plasticizer
In high casting slurry the solid concentration of alumina powder be solid concentration and solvent content ratio in solid concentration 81-85%, it is molten
Agent content 15-19%.
Further, the solvent is ethanol, methyl ethyl ketone and trichloro ethylene ternary azeotropic compositions.
Further, the concrete technology step using casting molding processes making aluminium oxide ceramics is as follows：
1）Alumina ceramic powder is put into ball mill and is ground, below 30 degrees Celsius of process of lapping strict temperature control,
Milling time should be when 50~58 is small, to obtain aluminium oxide ceramics abrasive of the granularity as 100-150nm fineness；
2）Aluminium oxide ceramics abrasive is mixed with additive, puts into secondary wet process grinding is carried out in grinder again, grinding
20-30 degrees Celsius of process strict temperature control, milling time should be when 24~48 is small, to obtain granularity as 50-100nm fineness
Premix slurry；
3）Premix slurry is had with ground premix slurry is mixed with organic plasticizer solution by appropriate proportioning again
Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, obtain casting slurry；And vacuum is carried out to casting slurry
De-bubble is handled；Froth in vacuum processing carries out froth in vacuum, stirring speed in the vacuum sealing agitator tank that vacuum is -0.95Mpa
Spend for 60~120 revs/min, mixing time is 15~30 minutes.
4）Allow casting slurry to flow into from container in aluminium oxide ceramics mould again, and scraped with scraper with aluminium oxide ceramics thickness
Pressure forms aluminium oxide ceramics green compact coated on aluminium oxide ceramics mould；
5）Drying chamber is sent into aluminium oxide ceramics green compact, is dried in the case where being filled with protective gas, rate of drying control
Reach 90% degree of drying when dry 4-5 is small；
6）It will be peeled after curing from mould as aluminium oxide ceramics green compact, then according to the size and dimension need of aluminium oxide ceramics
Green compact are punched, laminated working process, aluminium oxide ceramics blank to be sintered is made；
7）Aluminium oxide ceramics blank is obtained after sintering；Pass through working process again, obtain aluminium oxide ceramics finished product.
The advantage of the invention is that：
The present invention takes casting molding processes to make aluminium oxide ceramics, and by the improvement of casting molding processes, is protected using being filled with
It is dried in the case of shield gas, and by improving the solid concentration of alumina powder in casting slurry, reduces solvent content,
And and low boiling point slow using rate of drying and the ternary mixed solvent that rate of drying is fast and boiling point is high at the same time in formula, make base substrate
Easily drying, body drying is more uniform, and the aluminium oxide ceramics thickness of making is evenly；Allowance can be greatly reduced
Greatly, cost is lower, and qualification rate is substantially improved.
Embodiment
With reference to specific embodiment, the present invention is further explained.
Embodiment one
A kind of method that aluminium oxide ceramics is made using casting molding processes, by alumina ceramic powder and dispersant, binding agent
Mixed in a solvent with plasticizer, form the slurry of even stable suspension；Slurry is flow to from hopper lower part by casting machine again
On base band, base film is relatively moved to form by base band and scraper, the thickness of base film is controlled by scraper；Then base film is connected again
It is sent into drying chamber drying together with base band, carries out evaporation of the solvent, organic bond forms network structure between ceramic particle, is formed
With some strength and flexible blank, dry blank is stand-by together with base band spool；Make residual during storage
Solvent is evenly distributed, and eliminates moist gradient；Then can be by the cutting of required shape, punching or punching；Finally obtained by degreasing sintered
To finished product；Its feature is, when base film is sent into drying chamber drying together with base band, protective atmosphere is passed through to drying chamber, is dropped
The rate of drying of low base film strips upper surface；And mixed in a solvent in alumina ceramic powder and dispersant, binding agent and plasticizer
The solid concentration of alumina powder in casting slurry is improved in conjunction, solvent content is reduced, base substrate is easier drying；It is same in formula
Shi Caiyong rates of drying are slow and low boiling point and rate of drying is fast and boiling point is high solvent so that body drying is more uniform.
Further, the protective atmosphere that is passed through to drying chamber is to be closed drying chamber, and when drying base film,
By injection mode to being filled with protective gas in drying chamber so that the rate of drying control of base film reaches 90% when dry 4-5 is small
Degree of drying.
Further, the protective gas is inert gas, including nitrogen, helium or carbon dioxide；Indifferent gas
Bulk concentration is 80-90%.
Further, the alumina ceramic powder carries in being mixed in a solvent with dispersant, binding agent and plasticizer
In high casting slurry the solid concentration of alumina powder be solid concentration and solvent content ratio in solid concentration 81-85%, it is molten
Agent content 15-19%.
Further, the solvent is ethanol, methyl ethyl ketone and trichloro ethylene ternary azeotropic compositions.
Further, the concrete technology step using casting molding processes making aluminium oxide ceramics is as follows：
1）Alumina ceramic powder is put into ball mill and is ground, below 30 degrees Celsius of process of lapping strict temperature control,
Milling time should be when 50~58 is small, to obtain aluminium oxide ceramics abrasive of the granularity as 100-150nm fineness；
2）Aluminium oxide ceramics abrasive is mixed with additive, puts into secondary wet process grinding is carried out in grinder again, grinding
20-30 degrees Celsius of process strict temperature control, milling time should be when 24~48 is small, to obtain granularity as 50-100nm fineness
Premix slurry；
3）Premix slurry is had with ground premix slurry is mixed with organic plasticizer solution by appropriate proportioning again
Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, obtain casting slurry；And vacuum is carried out to casting slurry
De-bubble is handled；Froth in vacuum processing carries out froth in vacuum, stirring speed in the vacuum sealing agitator tank that vacuum is -0.95Mpa
Spend for 60~120 revs/min, mixing time is 15~30 minutes.
4）Casting slurry is allowed to flow into from container in aluminium oxide ceramics mould again, and with scraper with aluminium oxide ceramics thickness
Scrape coated on aluminium oxide ceramics mould, form aluminium oxide ceramics green compact；
5）Drying chamber is sent into aluminium oxide ceramics green compact, is dried in the case where being filled with protective gas, rate of drying control
Reach 90% degree of drying when dry 4-5 is small；
6）It will be peeled after curing from mould as aluminium oxide ceramics green compact, then according to the size and dimension of aluminium oxide ceramics
Need to be punched green compact, laminated working process, aluminium oxide ceramics blank to be sintered is made；
7）Aluminium oxide ceramics blank is obtained after sintering；Pass through working process again, obtain aluminium oxide ceramics finished product.
Embodiment two
As the principle of embodiment one, simply taken mold materials and slurry parameter have not same embodiment two, are
A kind of method that aluminium oxide ceramics is made using casting molding processes, will make the alumina ceramic powder of aluminium oxide ceramics first
Raw material ball milling, then the additive with making aluminium oxide ceramics are mixed together, and are carried out secondary wet process grinding after mixing again, are obtained
It is mixed to premix slurry, then ground premix slurry and organic plasticizer solution by appropriate proportioning with certain viscosity
Mixed slurry, and third time grinding is carried out to mixed slurry, casting slurry is obtained, and casting slurry is carried out at froth in vacuum
Reason；Allow casting slurry to flow into from container in aluminium oxide ceramics mould again, and coating is scraped with aluminium oxide ceramics thickness with scraper
On aluminium oxide ceramics mould, peeled after vacuum de-soak, drying, curing from above as aluminium oxide ceramics green compact, then basis
The size and dimension of aluminium oxide ceramics needs to be punched green compact, laminated working process, and aluminium oxide ceramics hair to be sintered is made
Base；Aluminium oxide ceramics blank is obtained after sintering；Pass through working process again, obtain aluminium oxide ceramics finished product.
Further, it is described to try the alumina ceramic powder raw material ball milling for making aluminium oxide ceramics by aluminium oxide ceramics
It is ground in powder material input ball mill, since aluminium oxide ceramics requires height, so process of lapping strict temperature control 30
Below degree Celsius, milling time should be ground when 54~56 is small using obtaining aluminium oxide ceramics of the granularity as 100-150nm fineness
Material.
Further, it is the aluminium oxide after first time is ground to carry out secondary wet process grinding after the mixing again
Ceramic grinding material is mixed together with additive, then puts into and wet grinding is carried out in grinder, process of lapping strict temperature control 20-
30 degrees Celsius, milling time should be when 28~30 is small, to obtain premix slurry of the granularity as 50-100nm fineness.
Further, the additive includes dispersant and solid solution additive.
Further, the proportioning of the additive and alumina ceramic powder raw material is alumina ceramic powder raw material
100 parts by weight, with 3-5 parts of additives.
Further, the described premix slurry crushed is mixed and made into tool with organic plasticizer solution by appropriate proportioning
The mixed slurry for having certain viscosity is to mix premix slurry with organic plasticizer solution, by stirring and modulating into non-aqueous tape-casting
Mixed slurry；Premix slurry and organic plasticizer solution proportioning be：Premix 100 parts of slurry, organic plasticizer solution 10-15
Part；Mixing time is 60-90 minutes.
Further, it is described that ground premix slurry and organic plasticizer solution are mixed and made into tool by appropriate proportioning
It is to mix premix slurry with organic plasticizer solution to have certain viscosity mixed slurry, after stirring, is ground in input
It is ground in grinding machine, when milling time 26-28 is small, obtains the mixed slurry of 50-100nm fineness.
Further, the organic plasticizer solution include binding agent, solvent, defrother, plasticizer,；It is binding agent, molten
Agent, plasticizer, the proportioning of defrother are：Premix 100 parts of slurry, 2-5 parts of binding agent, 4-8 parts of solvent, 2-5 parts of plasticizer, de-bubble
2-5 parts of agent.
Further, it is described to carry out third time to mixed slurry to grind being to put into mixed slurry in grinder to grind
Mill, when milling time 26-30 is small, obtains the casting slurry of 50-100nm fineness.
Further, the concrete technology step using casting molding processes making aluminium oxide ceramics is as follows：
1）Alumina ceramic powder is put into ball mill and is ground, below 30 degrees Celsius of process of lapping strict temperature control,
Milling time should be when 54~56 is small, to obtain aluminium oxide ceramics abrasive of the granularity as 100-150nm fineness；
2）Aluminium oxide ceramics abrasive is mixed with additive, puts into secondary wet process grinding is carried out in grinder again, grinding
20-30 degrees Celsius of process strict temperature control, milling time should be when 28~30 is small, to obtain granularity as 50-100nm fineness
Premix slurry；
3）Premix slurry is had with ground premix slurry is mixed with organic plasticizer solution by appropriate proportioning again
Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, milling time should be when 28~30 is small, to obtain granularity
For the premix slurry of 50-100nm fineness, casting slurry is obtained；And froth in vacuum processing is carried out to casting slurry；At froth in vacuum
Manage and froth in vacuum is carried out in the vacuum sealing agitator tank that vacuum is -0.95Mpa, mixing speed is 60~120 revs/min, is stirred
The time is mixed as 15~30 minutes；
4）Allow casting slurry to flow into from container in aluminium oxide ceramics mould again, and extrusion is scraped with aluminium oxide ceramics thickness with scraper
Apply on aluminium oxide ceramics mould, form aluminium oxide ceramics green compact；
5）Drying chamber is sent into aluminium oxide ceramics green compact, is dried in the case where being filled with protective gas, rate of drying control
Reach 90% degree of drying when dry 4-5 is small；
6）It will be peeled after curing from mould as aluminium oxide ceramics green compact, then according to the size and dimension need of aluminium oxide ceramics
Green compact are punched, laminated working process, aluminium oxide ceramics blank to be sintered is made；
7）Aluminium oxide ceramics blank is obtained after sintering；Pass through working process again, obtain aluminium oxide ceramics finished product.
It will be apparent that it should be understood that these embodiments are only illustrative of the invention and is not intended to limit the scope of the invention,
After reading the present invention, modification of the those skilled in the art to the various equivalent forms of the present invention each falls within right appended by the application will
Seek limited range.
The advantage of the invention is that：
The present invention takes casting molding processes to make aluminium oxide ceramics, and by the improvement of casting molding processes, is protected using being filled with
It is dried in the case of shield gas, and by improving the solid concentration of alumina powder in casting slurry, reduces solvent content,
And and low boiling point slow using rate of drying and the ternary mixed solvent that rate of drying is fast and boiling point is high at the same time in formula, make base substrate
Easily drying, body drying is more uniform, and the aluminium oxide ceramics thickness of making is evenly；Allowance can be greatly reduced
Greatly, cost is lower, and qualification rate is substantially improved.
Claims (6)
1. a kind of method of aluminium oxide ceramics tape casting, a kind of method of aluminium oxide ceramics tape casting, by aluminium oxide ceramics
Powder mixes in a solvent with dispersant, binding agent and plasticizer, forms the slurry of even stable suspension；Again will by casting machine
Slurry is flow on base band from hopper lower part, forms base film；Then base film is sent into drying chamber drying together with base band again, into
Row evaporation of the solvent, formation have some strength and flexible blank；Then can be by the cutting of required shape, punching or punching；Most
Afterwards finished product is obtained by degreasing sintered；It is characterized in that：When base film is sent into drying chamber drying together with base band, to drying chamber
Protective atmosphere is passed through, reduces the rate of drying of base film strips upper surface；And in alumina ceramic powder and dispersant, binding agent and increasing
Modeling agent improves the solid concentration of alumina powder in casting slurry in mixing in a solvent, reduce solvent content, base substrate is more held
It is easily dry；And low boiling point slow using rate of drying and the solvent that rate of drying is fast and boiling point is high at the same time in formula so that base substrate is done
It is dry more uniform.
2. the method for aluminium oxide ceramics tape casting as claimed in claim 1, it is characterised in that：Described is passed through drying chamber
Protective atmosphere is to be closed drying chamber, and when drying base film, by injection mode to being filled with protective gas in drying chamber,
So that the rate of drying control of base film reaches 90% degree of drying when dry 4-5 is small.
3. the method for aluminium oxide ceramics tape casting as claimed in claim 2, it is characterised in that：The protective gas is lazy
Property gas, including nitrogen, helium or carbon dioxide；Inert gas concentration is 80-90%.
4. the method for aluminium oxide ceramics tape casting as claimed in claim 3, it is characterised in that：The aluminium oxide ceramics powder
Alumina powder in casting slurry is improved at end solid concentration in being mixed in a solvent with dispersant, binding agent and plasticizer is solid
Phase content and the ratio of solvent content are in solid concentration 81-85%, solvent content 15-19%.
5. the method for aluminium oxide ceramics tape casting as claimed in claim 4, it is characterised in that：The solvent for ethanol,
Methyl ethyl ketone and trichloro ethylene ternary azeotropic compositions.
6. the method for aluminium oxide ceramics tape casting as claimed in claim 1, it is characterised in that：Described utilizes tape casting
The concrete technology step that technique makes aluminium oxide ceramics is as follows：
1）Alumina ceramic powder is put into ball mill and is ground, below 30 degrees Celsius of process of lapping strict temperature control,
Milling time should be when 50~58 is small, to obtain aluminium oxide ceramics abrasive of the granularity as 100-150nm fineness；
2）Aluminium oxide ceramics abrasive is mixed with additive, puts into secondary wet process grinding is carried out in grinder again, grinding
20-30 degrees Celsius of process strict temperature control, milling time should be when 24~48 is small, to obtain granularity as 50-100nm fineness
Premix slurry；
3）Premix slurry is had with ground premix slurry is mixed with organic plasticizer solution by appropriate proportioning again
Certain viscosity mixed slurry, and third time grinding is carried out to mixed slurry, obtain casting slurry；And vacuum is carried out to casting slurry
De-bubble is handled；Froth in vacuum processing carries out froth in vacuum, stirring speed in the vacuum sealing agitator tank that vacuum is -0.95Mpa
Spend for 60~120 revs/min, mixing time is 15~30 minutes.
4）Allow casting slurry to flow into from container in aluminium oxide ceramics mould again, and extrusion is scraped with aluminium oxide ceramics thickness with scraper
Apply on aluminium oxide ceramics mould, form aluminium oxide ceramics green compact；
5）Drying chamber is sent into aluminium oxide ceramics green compact, is dried in the case where being filled with protective gas, rate of drying control
Reach 90% degree of drying when dry 4-5 is small；
6）It will be peeled after curing from mould as aluminium oxide ceramics green compact, then according to the size and dimension need of aluminium oxide ceramics
Green compact are punched, laminated working process, aluminium oxide ceramics blank to be sintered is made；
Aluminium oxide ceramics blank is obtained after sintering；Pass through working process again, obtain aluminium oxide ceramics finished product.
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| CN201711366282.7A CN107903043A (en) | 2017-12-18 | 2017-12-18 | A kind of method of aluminium oxide ceramics tape casting |
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| CN109049289A (en) * | 2018-08-29 | 2018-12-21 | 厦门朝瓷科技有限公司 | A kind of preparation method of submicrometer structure ultrathin alumina ceramic green |
| CN111138172A (en) * | 2020-01-09 | 2020-05-12 | 福建闽航电子有限公司 | Tape casting sheet and manufacturing method thereof |
| CN111807846A (en) * | 2020-07-08 | 2020-10-23 | 四川华瓷科技有限公司 | Dry-bonded ceramic membrane slurry and slurrying method |
| CN112028615A (en) * | 2020-09-18 | 2020-12-04 | 深圳振华富电子有限公司 | Low-temperature co-fired ceramic material, laminated chip inductor and preparation method thereof |
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