CN1072621C - Ceramic thick membrane assembling process - Google Patents
Ceramic thick membrane assembling process Download PDFInfo
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- CN1072621C CN1072621C CN98122879A CN98122879A CN1072621C CN 1072621 C CN1072621 C CN 1072621C CN 98122879 A CN98122879 A CN 98122879A CN 98122879 A CN98122879 A CN 98122879A CN 1072621 C CN1072621 C CN 1072621C
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- biscuit
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Abstract
The present invention relates to a novel ceramic thick film combination forming preparation technology which belongs to the field of a material preparation technology. Firstly, a ceramic biscuit film with certain thickness is prepared by a flow casting method, the biscuit film is isostatically pressed after being dried for certain time, and the biscuit film is sintered. The present invention has the maximum advantage that the advantages of flow casting and isostatic pressing are combined, the present invention not only can prepare thin type large-area ceramics but also can cause the forming density of the biscuit to be increased by 8 to 11% by isostatic pressing to the biscuit, and the relative density of film material sintering can be increased by 5 to 10% under the condition of non-pressure sintering. A film material can be more uniform, smoother and denser, a technological process is not complex, and the present invention is suitable for ceramic preparation in a large scale.
Description
The present invention relates to the assembling process of ceramic thick film, belong to the material preparation process field.
As everyone knows, the moulding process of stupalith is very important in a ceramic material process link.The new moulding process of nearly one, 20 year stupalith occurs in succession, has promoted the development of stupalith, has enriched the intension of ceramic material science.But there is shortcoming in every kind of moulding process inevitably when giving its new advantage.For example, the casting method moulding is a kind of important processing method of the slim big area pottery of preparation, the thin ceramic that makes in this way has the quality height, advantages such as biscuit film machining process performance is good, and be adapted to large-scale commercial production, produce ceramic condenser and ic substrate with the domestic doctor-blade casting process that adopts maturely in the world, it also is the important process of a series of novel thick film ceramic functional devices of development preparation, as the solid electrolyte material YSZ film (8mol%Y in Solid Oxide Fuel Cell (SOFC)
2O
3Stable ZrO
2) very ripe with curtain coating technology preparation technology.But because the preparation technology's of casting films restriction own; its slurry solid content is lower; thereby though can improve the slurry solid content to increase particle diameter by means such as granulation or thermal treatment powders; improve biscuit density, but can cause sintered membrane material density to descend on the contrary if excessive then its sintering character of powder particle particle diameter descends.About 400～600nm, and require uniform particle diameter for its powder optimum grain-diameter of curtain coating legal system film, so comparatively complicated with the technological process that improves casting films sintered membrane material density by handling powder.On the other hand in casting films biscuit drying process, volatilization because of solvent, plastic agent and binding agent are difficult to fill the pore that solvent evaporates stays before dry, thereby leave many pits and hole on biscuit surface and inside, make the biscuit film short texture, density is lower, and the individual layer casting films is because thinner thickness, can not adopt some unconventional sintering means (as hot pressed sintering), can only adopt pressureless sintering, add the burn off of a large amount of organic additives in the sintering process, be difficult to obtain fine and close casting films sintered membrane material, all about 80～90%, difficulty reaches more than 95% the relative density of general casting films sintered membrane material.And for example, the characteristics of cold isostatic compaction are that powder is stressed evenly, can prepare the higher goods of all even biscuit density of shape density, add that its moulding stock is again latex, rubber etc., but thereby with the dry-pressing formed complicated or large-sized plate product of machining shape of comparing, if the thick film of casting method moulding is passed through cold isostatic compaction again, its biscuit density is further improved, improve the sintered density of casting films material, thereby improve the quality of thick film, this has just derived design of the present invention.
The object of the present invention is to provide a kind of novel ceramic thick film combination forming preparation technology, by curtain coating membranogen base is waited static pressure, not only can improve forming of green body density, and can improve sintered membrane material density, and technological process is uncomplicated.
Specifically, implementation process of the present invention is as follows, at first makes certain thickness biscuit film by casting method, treat its drying after, be cut to definite shape (unitary film or biscuit laminated material) and wait static pressure, and then carry out pressureless sintering.
Below in conjunction with concrete used for high-temperature fuel cell YSZ thick-film material, further comment intension of the present invention, but limit the present invention absolutely not.
Selecting median size for use is yttria-stabilized zirconia (YSZ) powder of 350nm and uniform particle diameter, in ceramic powder, added solvent and dispersion agent ball milling 24 hours earlier, add binding agent and plastic agent ball milling again and obtained to be uniformly dispersed stable slurry in 24 hours, on casting machine, make certain thickness biscuit film then by scraper.After treating the dry certain hour of biscuit film, its punch die is become the biscuit of desired size, wait static pressure, both can also can wait static pressure when waiting static pressure unitary film to laminated material with the pressure of 200MPa.During Deng static pressure its thickness and shape all there is not particular requirement.For simplifying sintering process, adopt " sandwich style " porous clamping plate (void content is 50～60%) agglomerating plant, the burn off of organic phase and the sintering of film material are once finished.The size and the variable density of biscuit film material before and after the static pressure such as mensuration, measure the density of sintered membrane material under the different sintering temperatures with drainage, and the microstructure of biscuit film surface and section and sintered membrane material section carried out scanning electron microscope (SEM) observation, with static pressure such as understandings to biscuit film and sintered membrane material density and the microstructural rule that influences.Casting films biscuit to the moulding of above-mentioned employing casting method is used isostatic pressing again, biscuit density can improve 8%～11%, the contraction of biscuit film thickness direction reaches 0～6%, area is contracted in about 5%, and under same sintering temperature (as 1550 ℃) sintering, the relative density of sintered membrane material can improve 5%～10%.
Scanning electronic microscope (SEM) photo of Fig. 1 for waiting same casting films biscuit microstructure in static pressure front and back to change.(a) and (b) are without the upper surface and the fracture photo that wait the static pressure biscuit, (c), (d) be through etc. the upper surface and the fracture photo of biscuit behind the static pressure (200MPa).
As seen from Figure 1, casting films because the volatilization of solvent will inevitably stay a large amount of holes on biscuit surface and inside, makes the biscuit short texture in drying process, and compact density is low, and this will inevitably influence the sintered density of casting films material.By biscuit being waited static pressure post forming compression biscuit, can eliminate biscuit surface and inside holes greatly, make between the particle, air vent aperture and distribute more even in conjunction with tightr, forming of green body density improves, for the raising of sintered membrane material density is laid a solid foundation.In addition, even can not eliminate dry biscuit surface, back and inside holes, so the static pressure post forming that waits of casting films biscuit is of universal significance by organic reagent consumption in means such as the granulation minimizing slurry.
Fig. 2 waits static pressure to the lifting of YSZ thick film firing film material density and the relation of casting films biscuit density, and sintering temperature is 1550 ℃, and X-coordinate is the biscuit density of thick film, and unit is (g/cm
3), ordinate zou is a sintered membrane material density, unit is (g/cm
3).Curve 1 is without the lifting of the thick film firing film material density of isostatic pressing and the relation of biscuit density, and curve 2 is through the lifting of the thick film firing film material density of 200MPa pressure isostatic pressing and the relation of biscuit density.
As seen from Figure 2, different biscuit film are under identical sintering temperature, the relative density of its biscuit sintered membrane material after waiting static pressure generally all can improve 5%～10%, its reason just is that the volatilization of solvent in the casting films drying process will inevitably stay hole in the surface and the inside of biscuit, make biscuit fine and close inadequately, and obviously can eliminate the biscuit inside holes to a certain extent after waiting static pressure, make between the particle in conjunction with tightr.In addition, from figure, also can find out, wait the amplitude that sintered membrane material density improves behind the static pressure also relevant with the former density of film material, obviously as former density low then biscuit density is low, more remarkable effect behind the static pressure is more then waited in its compressible leeway.Also is limited Deng static pressure to the ability that film material density improves, because it can not eliminate pore left in the sintering process, sintered membrane material density also waits other factors relevant with the powder particle size in addition.
Fig. 3 is the SEM photo of same casting films corresponding to the sintered membrane material section of curve among Fig. 21,2, and sintering temperature is 1550 ℃, (a) does not wait static pressure, (b) static pressure such as 200MPa.As can be seen, do not wait the sintered membrane material section of static pressure casting films biscuit that many gross blow holes are arranged, and diameter is all about a few μ m, sintering under the same conditions after waiting static pressure, the aperture of pore and quantity all have obvious reduction, and have only a spot of spilehole to exist.Obviously its surface is relevant with inside holes after the gross blow hole that does not wait static pressure casting films sintered membrane material section and the biscuit drying, biscuit through etc. eliminated the existence of hole behind the static pressure, be left a spot of spilehole in the sintered membrane material.
Under the different as can be seen sintering temperatures of the densimetric curve of sintered membrane material under the different sintering temperatures, the lifting of sintered membrane material relative density is all greater than 5% after waiting static pressure (200MPa) from same biscuit film, and its result as shown in Figure 4.Among the figure X-coordinate be sintering temperature (℃), ordinate zou is the density (g/cm of sintered membrane material
3).Curve 1 and 2 be respectively without isostatic pressing and behind isostatic pressing the sintering temperature of YSZ casting films material and the relation curve of sintered membrane material density.
The feature of ceramic thick membrane assembling process provided by the invention not only is flow casting molding and two kinds of moulding processs of cold isostatic compaction are combined, and is that biscuit of ceramics film that (1) makes flow casting molding is all unrestricted to the thickness and the shape of biscuit when waiting static pressure; (2) when the biscuit of ceramics film is waited static pressure, both can wait static pressure, also can carry out isostatic cool pressing curtain coating membranogen base laminated material to unitary film.
This shows and the invention has the advantages that:
(1) wait static pressure that biscuit film is shunk to the curtain coating biscuit film, and reduce its surface and inside holes, make more even compact of its internal structure, forming of green body density can improve 8%～11%.
(2) after waiting static pressure, the relative density of casting films sintered membrane material generally all can improve 5%～10%, and the aperture of film material internal porosity and quantity all have obvious reduction.
(3) static pressure post forming such as casting films can improve film material forming of green body density and burn till density, and technological process is uncomplicated, is applicable to the scale preparation of ceramic membrane.
Embodiment 1: selecting median size for use is the YSZ powder of the uniform particle diameter of 350nm, added dispersion agent and solvent ball milling 24 hours, add binding agent and plastic agent ball milling again and obtained to be uniformly dispersed stable slurry in 24 hours, on casting machine, make certain thickness biscuit film (table 1:1 film) then by scraper.After treating the dry certain hour of biscuit film, its punch die is become the biscuit of desired size, wait static pressure with the pressure of 200MPa.Deng being contracted in about 5% of biscuit film two dimensional surface direction behind the static pressure, it is about 8% that biscuit density improves, wait static pressure before and after the biscuit film microstructure change as shown in Figure 1, in the raising of 1550 ℃ of sintering temperature film material relative densities greater than 5%.Table 1: wait the influence of static pressure to curtain coating membranogen base
No. 2 films of No. 1 film
Area/mm
2Thickness/mm density/g.cm
-3Area/mm
2Thickness/mm density/g.cm
-3Without waiting static pressure 400 0.09 2.92 375 0.31 2.87 through waiting static pressure (200MPa) 380 0.09 3.16 355 0.29 3.20 area contraction/% 5.0 5.3 thickness contraction/%～0 5.9 variable density/% 8.2 11.5
Embodiment 2: the biscuit film that flow casting molding makes, unitary film mean thickness are 0.31mm, and area is 375mm
2, behind the static pressure such as 200MPa, the biscuit film area is punctured into 5.3%, and thickness is punctured into 5.9%, and biscuit density has improved 11.5%, and concrete data see Table the 1:2 film, and all the other are with embodiment 1.
Embodiment 3: the biscuit film that flow casting molding makes, and become the disk of diameter 40mm to wait static pressure towards film it, at 1550 ℃ of sintering, not waiting static pressure casting films sintered membrane material density is 5.4g/cm
3, the density of casting films sintered membrane material is 5.7g/cm behind static pressure such as 200MPa
3, relative density rises greater than 5%.
Embodiment 4: the biscuit film that flow casting molding makes becomes 20 * 20mm with it towards film
2Square sheet and lamination wait static pressure (200MPa), at 1550 ℃ of sintering.Not waiting static pressure casting films sintered membrane material density is 5.2g/cm
3, 14 layers and 16 laminar flows prolong membranogen base lamination and etc. behind the static pressure, at same sintering temperature, sintered density is respectively 5.7g/cm
3And 5.8g/cm
3, the rising of relative density reaches 8～10%.
Claims (4)
1. ceramic thick film combination forming preparation technology, it is characterized in that flow casting molding and two kinds of ceramic moldings of cold isostatic compaction are combined, adopt earlier casting method to make certain thickness biscuit of ceramics film, treat its dry certain hour after, biscuit film is waited static pressure.
2. by the described ceramic thick film combination forming of claim 1 preparation technology, when it is characterized in that biscuit of ceramics film that described flow casting molding makes waits static pressure, all unrestricted to the thickness and the shape of biscuit.
3. by the described ceramic thick film combination forming of claim 1 preparation technology, it is characterized in that static pressure such as described biscuit of ceramics film individual layers.
4. by the described ceramic thick film combination forming of claim 1 preparation technology, it is characterized in that static pressure such as curtain coating biscuit film laminated materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98122879A CN1072621C (en) | 1998-12-28 | 1998-12-28 | Ceramic thick membrane assembling process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN98122879A CN1072621C (en) | 1998-12-28 | 1998-12-28 | Ceramic thick membrane assembling process |
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|---|---|
| CN1226534A CN1226534A (en) | 1999-08-25 |
| CN1072621C true CN1072621C (en) | 2001-10-10 |
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|---|---|---|---|
| CN98122879A Expired - Fee Related CN1072621C (en) | 1998-12-28 | 1998-12-28 | Ceramic thick membrane assembling process |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105503182A (en) * | 2015-12-18 | 2016-04-20 | 珠海市香之君科技股份有限公司 | Cutter blank forming technology of ceramic surgical blade |
| CN106242567A (en) * | 2016-07-13 | 2016-12-21 | 西安科技大学 | A kind of lanthanum molybdate-based thick-film material of high oxide ion conduction and preparation method thereof |
| CN107658230A (en) * | 2017-08-30 | 2018-02-02 | 广东风华高新科技股份有限公司 | A kind of regulation and control method of ceramic chips and ltcc substrate surface roughness |
| CN107602114B (en) * | 2017-10-26 | 2022-05-20 | 贵州大学 | Barium calcium zirconate titanate BCZT piezoelectric ceramic and texturing preparation method thereof |
| CN109160809A (en) * | 2018-08-29 | 2019-01-08 | 厦门朝瓷科技有限公司 | A kind of submicrometer structure ultrathin alumina ceramic substrate and preparation method |
| CN108947504A (en) * | 2018-08-29 | 2018-12-07 | 厦门朝瓷科技有限公司 | Submicrometer structure ultrathin alumina ceramic substrate and preparation method |
| CN114800775B (en) * | 2022-05-23 | 2023-04-18 | 江苏方达正塬电子材料科技有限公司 | GSPL-SNST silicon nitride tape casting biscuit and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126132A (en) * | 1995-01-06 | 1996-07-10 | 侯伟华 | Isostatic pressing method for ceramic powder |
| CN2233929Y (en) * | 1995-11-09 | 1996-08-28 | 河北邢台晶牛玻璃股份有限公司 | Pressing machine by flowing out method for slag nucleated glass |
-
1998
- 1998-12-28 CN CN98122879A patent/CN1072621C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1126132A (en) * | 1995-01-06 | 1996-07-10 | 侯伟华 | Isostatic pressing method for ceramic powder |
| CN2233929Y (en) * | 1995-11-09 | 1996-08-28 | 河北邢台晶牛玻璃股份有限公司 | Pressing machine by flowing out method for slag nucleated glass |
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| CN1226534A (en) | 1999-08-25 |
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