CN115784753A - Ceramic substrate preparation method based on tape casting technology - Google Patents
Ceramic substrate preparation method based on tape casting technology Download PDFInfo
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- CN115784753A CN115784753A CN202211234493.6A CN202211234493A CN115784753A CN 115784753 A CN115784753 A CN 115784753A CN 202211234493 A CN202211234493 A CN 202211234493A CN 115784753 A CN115784753 A CN 115784753A
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Abstract
The invention discloses a ceramic substrate preparation method based on a tape casting technology, which comprises the following steps: preparing casting slurry, casting and molding, drying at low temperature and sintering; in the low-temperature drying process, the raw porcelain belt is firstly dried in a 35-55 ℃ region, then dried in a 50-70 ℃ region and finally dried in a 68-90 ℃ region; in the sintering process, the green ceramic chip is sintered in a graphite sintering furnace after circuit pattern printing and lamination molding; carrying out positive pressure sintering in a flowing nitrogen atmosphere at the sintering temperature of 1680-1750 ℃ under the air pressure of 15-50 KPa; rapidly heating to 1680-1750 ℃ and keeping the constant temperature for 2-5 hours; after sintering, self-heating and cooling to room temperature under the normal pressure of a flowing nitrogen atmosphere to obtain a finished product; according to the technical scheme, the ceramic substrate preparation method based on the tape casting technology ensures that the raw ceramic tape is uniformly heated and avoids the problem of local deformation caused by local nonuniform heating through segmented low-temperature drying and gradual rise of drying temperature.
Description
Technical Field
The invention belongs to the field of ceramic substrate forming, and particularly relates to a ceramic substrate preparation method based on a tape casting technology.
Background
Ceramic substrates have become the fundamental material for high power electronic circuit structure technology and interconnect technology. In the prior art, the preparation of the ceramic substrate is mainly a method of tape casting. In the prior art, in the drying process of the casting molding process, the problems of uneven heating or local deformation of the green ceramic tape and the like are easily caused, the flatness of the molded green ceramic sheet is influenced, and the quality and the performance of the ceramic substrate are influenced.
Disclosure of Invention
The invention aims to provide a preparation method of a ceramic substrate based on a tape casting technology, which solves the problems in tape casting in the prior art.
The technical scheme of the invention is a ceramic substrate preparation method based on a tape casting technology,
s1, preparing casting slurry, and fully mixing 50-80 parts by weight of micron ceramic powder slurry and 20-30 parts by weight of solvent to obtain first slurry; then adding 0.5-5 parts of dispersing agent into the first slurry, carrying out first ball milling for 20-40 hours to obtain second slurry, adding 3-5 parts of binding agent and 2-5 parts of plasticizer into the second slurry, carrying out second ball milling for 20-40 hours to obtain third slurry; adding 0.01-0.8 part of defoaming agent into the third slurry, and fully and slowly stirring at the stirring speed of 60-80 rpm for 10-20 minutes to obtain casting slurry;
s2, tape casting molding, namely placing the tape casting slurry prepared in the S1 into a tape casting machine for tape casting to obtain a raw porcelain tape, and keeping the slurry to be slowly stirred in the tape casting at a stirring speed of 60-80 revolutions per minute;
s3, drying at low temperature, namely, putting the raw porcelain obtained in the S2 into a dryer for drying at low temperature, and cutting after drying to obtain a raw porcelain sheet; during drying, the raw porcelain belt is firstly dried in a 35-55 ℃ region, then dried in a 50-70 ℃ region and finally dried in a 68-90 ℃ region;
s4, sintering, namely, printing and laminating the green ceramic chip by a circuit pattern, and then sintering in a graphite sintering furnace; carrying out positive pressure sintering in a flowing nitrogen atmosphere at the sintering temperature of 1680-1750 ℃ under the air pressure of 15-50 KPa; rapidly heating to 1680-1750 ℃ and keeping the constant temperature for 2-5 hours; and after sintering, self-heating and cooling to room temperature under the atmosphere of flowing nitrogen at normal pressure to obtain a finished product.
Preferably, in S1, the micron ceramic powder slurry contains 30-60% by weight of micron ceramic powder and 5-10% by weight of GaO-Al 2 O 3 -SiO 2 ；
The solvent is a mixture of any two of absolute ethyl alcohol, isopropanol, n-butanol, triethyl phosphate and xylene, and the mixing ratio is 1;
the dispersant is castor oil;
the binder is polyvinyl butyral;
the plasticizer is one or a mixture of more than two of dioctyl phthalate, dibutyl sebacate and butyl benzyl phthalate;
the defoaming agent is one of tributyl phosphate or organic silicone oil.
Preferably, the casting machine comprises a frame, a base belt conveying mechanism arranged on the frame, and a scraper mechanism and a slurry conveying mechanism which are arranged above a base belt conveyed by the base belt conveying mechanism;
the base band conveying mechanism comprises a first driving roller set, a first tensioning roller, a second tensioning roller and a second driving roller set which are sequentially arranged, wherein the first driving roller set is arranged close to the base band roll, and the second tensioning roller set is arranged close to the oven;
first tensioning roller sets up the side below of second tensioning roller, first tensioning roller and second tensioning roller obtain one section slope baseband section that goes up, scraper mechanism with thick liquids conveying mechanism sets up the slope is to the top of baseband section, scraper mechanism is close to the slope and goes up the high-end setting of baseband section.
Preferably, thick liquids conveying mechanism includes the thick liquids bucket, sets up low-speed rabbling mechanism in the thick liquids bucket, connect and be in thick liquids barrel head's curtain coating leads the thick liquids subassembly, the curtain coating is led the thick liquids subassembly and is included the crooked cylinder pipe of being connected with the thick liquids bucket and connect the duckbilled pipe in crooked cylinder pipe bottom, duckbilled pipe width suits with green tape width.
Preferably, the scraper mechanism comprises a first scraper and a second scraper which are arranged in parallel along the conveying direction of the base belt, the first scraper and the second scraper are respectively connected with a first mounting shaft and a second mounting shaft, one end of the first mounting shaft and one end of the second mounting shaft are respectively fixedly connected with a first gear and a second gear, a sector gear is arranged between the first gear and the second gear, and the central angle of the sector gear is 180 degrees; the sector gear is sequentially meshed with the first gear and the second gear to drive the first gear and the second gear to sequentially rotate for 180 degrees; and the sector gear is connected with a stepping motor.
Preferably, first installation axle with the both ends of second installation axle are provided with lift mounting panel one and lift mounting panel two respectively, lift mounting panel one with lift mounting panel two is realized first installation axle with the installation of second installation axle, it has two screws and guide polish rod respectively to equally divide on lift mounting panel one and the lift mounting panel two, the cover is equipped with supporting spring on the screw rod, supporting spring as for lift mounting panel one with lift mounting panel two bottoms, lift mounting panel one with adjusting nut has been cup jointed on the screw rod of two tops of lift mounting panel.
The ceramic substrate preparation method based on the tape casting technology has the beneficial effects that:
1. through segmentation low temperature drying, drying temperature rises gradually, ensures that the raw porcelain area is heated evenly, avoids appearing the problem that local deformation appears in the local unevenness of being heated.
2. Through carrying out the curtain coating on the baseband section that inclines to make progress, ensure that the tape casting of raw porcelain is stable for certain internal force that pulls appears each other in the raw porcelain area, improve the toughness in raw porcelain area, also make raw ceramic piece non-deformable in drying.
Drawings
Fig. 1 is a front view of a casting machine according to the present invention.
Fig. 2 is a perspective view of a casting machine according to the present invention.
Fig. 3 is a schematic structural view of a scraper mechanism in a casting machine according to a technical solution of the present invention.
Fig. 4 is a diagram of a switching operation state of two scrapers in the technical solution of the present invention, specifically, a switching process of a first scraper to a second scraper.
Fig. 5 is a diagram of a switching operation state of two scrapers in the technical solution of the present invention, specifically, a switching process from the second scraper to the first scraper.
Detailed Description
In order to facilitate those skilled in the art to understand the technical solutions of the present invention, the technical solutions of the present invention will be further described with reference to the specific embodiments and the drawings.
The technical scheme of the invention relates to a ceramic substrate preparation method based on a tape casting technology, which comprises the following steps:
s1, preparing casting slurry, and fully mixing 50-80 parts by weight of micron ceramic powder slurry and 20-30 parts by weight of solvent to obtain first slurry; then adding 0.5-5 parts of dispersing agent into the first slurry, carrying out first ball milling for 20-40 hours to obtain second slurry, adding 3-5 parts of binding agent and 2-5 parts of plasticizer into the second slurry, carrying out second ball milling for 20-40 hours to obtain third slurry; and adding 0.01-0.8 part of defoaming agent into the third slurry, and fully and slowly stirring at the stirring speed of 60-80 rpm for 10-20 minutes to obtain the casting slurry.
And S2, tape casting, namely placing the tape casting slurry prepared in the S1 into a tape casting machine for tape casting to obtain a raw porcelain tape, and keeping the slurry to be slowly stirred in the tape casting at a stirring speed of 60-80 rpm.
S3, drying at a low temperature, namely, putting the raw ceramic obtained in the step S2 into a dryer for low-temperature drying, and cutting after drying to obtain a raw ceramic sheet; in the drying process, the green porcelain belt is firstly dried in a 35-55 ℃ area, then dried in a 50-70 ℃ area and finally dried in a 68-90 ℃ area.
S4, sintering, namely, printing and laminating the green ceramic chip by a circuit pattern, and then sintering in a graphite sintering furnace; carrying out positive pressure sintering in a flowing nitrogen atmosphere at the sintering temperature of 1680-1750 ℃ under the air pressure of 15-50 KPa; rapidly heating to 1680-1750 ℃ and keeping the constant temperature for 2-5 hours; and after sintering, self-heating and cooling to room temperature under the atmosphere of flowing nitrogen at normal pressure to obtain a finished product.
In S1, the micron ceramic powder slurry contains 30-60% by weight of micron ceramic powder and 5-10% by weight of GaO-Al 2 O 3 -SiO 2 。
The solvent is a mixture of any two of absolute ethyl alcohol, isopropanol, n-butanol, triethyl phosphate and xylene, and the mixing ratio is 1. The dispersant is castor oil. The binder is polyvinyl butyral. The plasticizer is one or a mixture of more than two of dioctyl phthalate, dibutyl sebacate and butyl benzyl phthalate. The defoaming agent is one of tributyl phosphate or organic silicone oil.
Based on above-mentioned technical scheme, through the stoving of sectional type, realize the curtain coating and rise the temperature slowly and dry, the effectual raw ceramic chip of avoiding directly arranges the local deformation scheduling problem that the stoving caused in higher temperature in, ensures fashioned curtain coating raw ceramic chip surfacing, local deformation scheduling problem can not appear.
In this technical solution, as shown in fig. 1, the casting machine includes a frame 1, a base band conveying mechanism disposed on the frame 1, and a scraper mechanism 5 and a slurry conveying mechanism 4 disposed above the base band conveyed by the base band conveying mechanism. The base band conveying mechanism comprises a first driving roller group (not shown), a first tensioning roller 2, a second tensioning roller 3 and a second driving roller group (not shown) which are arranged in sequence. The first set of drive rollers is located close to the base strip roll, i.e. close to the bottom end of the obliquely upward base strip section 10, and the second set of tensioning rollers is located close to the oven, i.e. close to the high end of the obliquely upward base strip section 10.
The first tensioning roller 2 is arranged laterally below the second tensioning roller 3, the first tensioning roller 2 and the second tensioning roller 3 obtaining a length of base band segment 10 inclined upwards. The blade mechanism 5 and the slurry feed mechanism 4 are disposed above the obliquely upward base belt segment 10. The scraper mechanism 5 is located near the high end of the obliquely upward base belt segment 10.
Through above-mentioned technical scheme, adopt the setting of first tensioning roller 2 and the 3 structures of second tensioning roller and position, obtain a slope baseband section 10 that makes progress, make the curtain coating on slope baseband section 10 that makes progress, carry out the curtain coating through the inclined plane promptly, change the prior art and carry out the operation mode of curtain coating on the horizontal baseband. At the time of delay, for the thickness of ensureing the raw china area, at first make the thick liquids of curtain coating to the baseband more, then strike off unnecessary thick liquids through the scraper, also realize raw china area upper surface simultaneously and level, at such in-process, will cause can appear a large amount of thick liquids and pile up for a long time on the flowing surface of scraper, the normal work of face influence scraper, make a large amount of thick liquids of adhesion that can be quick on the scraper, make the blade of scraper need frequent clearance, these thick liquids of adhesion on the scraper can be to the quality and the roughness on raw china area surface through its below simultaneously.
And carry out the curtain coating on the inclined plane, the thick liquids can flow downwards under the action of gravity, the baseband upwards carries, when waiting to move 5 positions of scraper mechanism, the thick liquids that increase for guaranteeing raw ceramic area thickness and increase on the baseband can flow downwards under the action of gravity, guaranteed raw ceramic area thickness on the one hand like this, also avoid a large amount of thick liquids to pile up at the upstream face of scraper simultaneously, just so avoided the scraper that appears in the aforesaid prior art in the plane flow delay to meet the problem that the thick liquids of the quick adhesion of face of a knife lead to a large amount of thick liquids of scraper sword to pile up, avoid the asking for of frequent clearance of scraper sword, avoid the thick liquids of adhesion on the scraper sword to the problem of raw ceramic area surface quality influence.
In this technical scheme, thick liquids conveying mechanism includes thick liquids bucket 41, sets up the low-speed rabbling mechanism (not drawn) in thick liquids bucket 41, connects the curtain coating of thick liquids bucket 41 bottom and leads the thick liquids subassembly. The casting slurry guiding assembly comprises a bent cylindrical conduit 42 connected with the slurry barrel 41 and a duckbill conduit 43 connected at the bottom end of the bent cylindrical conduit 42, and the width of the duckbill conduit 43 is adapted to the width of the green tape.
In the technical scheme, the slurry is stirred at a low speed, so that the slurry is ensured to flow slowly all the time, the fluidity and the uniformity of the slurry are ensured, and air bubbles and the like in the slurry can be eliminated. The curved cylindrical conduit 42 realizes slurry diversion on one hand and ensures that the slurry flows slowly on the other hand, and the problem that the stable flow casting on the base band is influenced by the sudden increase of the local flow speed of the slurry is avoided. Duckbilled pipe 43 realizes evenly reaching the water conservancy diversion to the baseband with the thick liquids, ensures that the raw porcelain strap thickness is even.
In this embodiment, the scraper mechanism 5 includes a first scraper 51 and a second scraper 52 that are parallel to each other and are disposed along the substrate conveying direction. The first scraper 51 and the second scraper 52 are detachably connected with a first mounting shaft 53 and a second mounting shaft 54, respectively. A first gear 55 and a second gear 56 are respectively fixed to one ends of the first mounting shaft 53 and the second mounting shaft 54. A sector gear 57 is provided between the first gear 55 and the second gear 56, and a central angle of the sector gear 57 is 180 degrees. The sector gear 57 is sequentially engaged with the first gear 55 and the second gear 56, and rotates the first gear 55 and the second gear 56 by 180 degrees in sequence. A stepping motor 58 is connected to the sector gear 57.
Based on the above technical scheme, the step motor 58 accurately controls the sector gear 57 to stop after rotating for one circle each time, so as to realize the switching between the first scraper and the second scraper. As shown in fig. 4, first, assuming that the first scraper 51 is working and the second scraper is in standby, when slurry adhered to the edge of the first scraper needs to be cleaned, i.e. when a cutter needs to be changed, first, the fan-shaped gear 57 is controlled by the stepping motor 58 to rotate for one revolution, during one revolution of the fan-shaped gear, the fan-shaped gear is firstly meshed with the second gear, the second scraper 52 is driven to rotate downwards by the second gear 56, and after the fan-shaped gear rotates for 180 degrees, the second scraper 52 rotates to the state shown in (c) in fig. 4, at this time, the stepping motor controls the fan-shaped gear to continue rotating, at this time, the fan-shaped amount is meshed with the first gear 55, the first gear 55 is driven to rotate, and after (c) in fig. 4, the first gear 55 drives the first scraper 51 to rotate upwards, so as to rotate the first scraper 51 to the right above, at this time, the first scraper and the second scraper are in the state shown in (e) in fig. 5, that is the first scraper is switched to the second scraper. At this time, the stepping motor controls the sector gear to rotate through one revolution, and the sector gear returns to the position before rotation and stops. When the second blade needs to be cleaned, the second blade is switched to the first blade, and the control process and the switching process are as shown in fig. 5, which is opposite to the direction in fig. 4.
In this technical scheme, the both ends of first installation axle 53 and second installation axle 54 are provided with two lifting mounting panels 61 and the lifting mounting panel 62 respectively. The first and second lifting mounting plates 61 and 62 enable the first and second mounting shafts 53 and 54 to be mounted. The first lifting mounting plate 61 and the second lifting mounting plate 62 respectively penetrate through two screws 63 and a guide polished rod 67, the screws 63 are sleeved with supporting springs 64, and the supporting springs 64 are arranged at the bottoms of the first lifting mounting plate 61 and the second lifting mounting plate 62. And adjusting nuts 65 are sleeved on the screws 63 above the first lifting mounting plate 61 and the second lifting mounting plate 62.
Among the above-mentioned technical scheme, through upwards rotation regulation adjusting nut 65, realize relaxing lift mounting panel 61 or lift mounting panel two 62, lift mounting panel 61 or lift mounting panel two 62 upwards sliding motion under supporting spring 64's effect has realized installing the rising regulation of first scraper and the second scraper on lift mounting panel 61 or lift mounting panel two 62. Conversely, the adjusting nut 65 is adjusted downwards, the adjusting nut 65 presses the first lifting mounting plate 61 or the second lifting mounting plate 62 downwards, downward adjustment of the first scraper and the second scraper mounted on the first lifting mounting plate 61 or the second lifting mounting plate 62 is achieved, the adjusting operation is simple, and micro-adjustment can be achieved.
Technical solution of the invention is described above by way of example with reference to the embodiments and the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments described above, and that the invention is within the scope of the invention, as long as various insubstantial modifications of the inventive concept and technical solution are made, or the inventive concept and technical solution are directly applied to other situations without modification.
Claims (6)
1. A method for preparing a ceramic substrate based on tape casting technology is characterized in that,
s1, preparing casting slurry, and fully mixing 50-80 parts by weight of micron ceramic powder slurry and 20-30 parts by weight of solvent to obtain first slurry; then adding 0.5-5 parts of dispersing agent into the first slurry, carrying out first ball milling for 20-40 hours to obtain second slurry, adding 3-5 parts of binding agent and 2-5 parts of plasticizer into the second slurry, carrying out second ball milling for 20-40 hours to obtain third slurry; adding 0.01-0.8 part of defoaming agent into the third slurry, and fully and slowly stirring at the stirring speed of 60-80 rpm for 10-20 minutes to obtain casting slurry;
s2, tape casting, namely placing the tape casting slurry prepared in the S1 into a tape casting machine for tape casting to obtain a raw porcelain tape, and keeping the slurry to be slowly stirred in the tape casting at a stirring speed of 60-80 rpm;
s3, drying at a low temperature, namely, putting the raw ceramic obtained in the step S2 into a dryer for low-temperature drying, and cutting after drying to obtain a raw ceramic sheet; during drying, the green porcelain belt is firstly dried in a 35-55 ℃ area, then dried in a 50-70 ℃ area and finally dried in a 68-90 ℃ area;
s4, sintering, namely printing and laminating the green ceramic chips through circuit patterns, and then sintering in a graphite sintering furnace; carrying out positive pressure sintering in a flowing nitrogen atmosphere, wherein the pressure is 15KPa to 50KPa, and the sintering temperature is 1680 ℃ to 1750 ℃; rapidly heating to 1680-1750 ℃ and keeping the constant temperature for 2-5 hours; and after sintering, carrying out self-heating cooling to room temperature under the normal pressure of a flowing nitrogen atmosphere to obtain a finished product.
2. The method for preparing a ceramic substrate according to claim 1, wherein in S1, the slurry of the micron ceramic powder comprises 30-60% by weight of the micron ceramic powder and 5-10% by weight of GaO-Al 2 O 3 -SiO 2 ；
The solvent is a mixture of any two of absolute ethyl alcohol, isopropanol, n-butanol, triethyl phosphate and xylene, and the mixing ratio is 1;
the dispersant is castor oil;
the binder is polyvinyl butyral;
the plasticizer is one or a mixture of more than two of dioctyl phthalate, dibutyl sebacate and butyl benzyl phthalate;
the defoaming agent is one of tributyl phosphate or organic silicone oil.
3. The method for preparing a ceramic substrate based on a casting technology according to claim 1, wherein the casting machine comprises a frame, a base belt conveying mechanism arranged on the frame, and a scraper mechanism and a slurry conveying mechanism which are arranged above a base belt conveyed by the base belt conveying mechanism;
the base band conveying mechanism comprises a first driving roller set, a first tensioning roller, a second tensioning roller and a second driving roller set which are sequentially arranged, wherein the first driving roller set is arranged close to the base band roll, and the second tensioning roller set is arranged close to the oven;
first tensioning roller sets up the side below of second tensioning roller, first tensioning roller and second tensioning roller obtain one section slope baseband section that goes up, scraper mechanism with thick liquids conveying mechanism sets up the slope is to the top of baseband section, scraper mechanism is close to the slope and goes up the high-end setting of baseband section.
4. The casting technology-based ceramic substrate preparation method according to claim 3, wherein the slurry conveying mechanism comprises a slurry barrel, a low-speed stirring mechanism arranged in the slurry barrel, and a casting slurry guide assembly connected to the bottom of the slurry barrel, the casting slurry guide assembly comprises a bent cylindrical pipe connected with the slurry barrel and a duckbill pipe connected to the bottom end of the bent cylindrical pipe, and the width of the duckbill pipe is adapted to the width of the green tape.
5. The method of claim 3, wherein the scraper mechanism comprises a first scraper and a second scraper arranged in parallel along a direction of belt conveyance, the first scraper and the second scraper are respectively connected with a first mounting shaft and a second mounting shaft, one end of the first mounting shaft and one end of the second mounting shaft are respectively fixedly connected with a first gear and a second gear, a sector gear is arranged between the first gear and the second gear, and a central angle of the sector gear is 180 degrees; the sector gear is sequentially meshed with the first gear and the second gear to drive the first gear and the second gear to sequentially rotate for 180 degrees; and the sector gear is connected with a stepping motor.
6. The method of claim 5, wherein a first lifting mounting plate and a second lifting mounting plate are respectively disposed at two ends of the first mounting shaft and the second mounting shaft, the first lifting mounting plate and the second lifting mounting plate are used for mounting the first mounting shaft and the second mounting shaft, two screws and a guide polish rod respectively pass through the first lifting mounting plate and the second lifting mounting plate, the screws are sleeved with support springs, the support springs are disposed at bottoms of the first lifting mounting plate and the second lifting mounting plate, and adjusting nuts are sleeved on the screws above the first lifting mounting plate and the second lifting mounting plate.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211234493.6A CN115784753A (en) | 2022-10-10 | 2022-10-10 | Ceramic substrate preparation method based on tape casting technology |
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| CN202211234493.6A CN115784753A (en) | 2022-10-10 | 2022-10-10 | Ceramic substrate preparation method based on tape casting technology |
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