WO2004011390A1 - 多孔質セラミックス体の製造方法 - Google Patents
多孔質セラミックス体の製造方法 Download PDFInfo
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- WO2004011390A1 WO2004011390A1 PCT/JP2003/008712 JP0308712W WO2004011390A1 WO 2004011390 A1 WO2004011390 A1 WO 2004011390A1 JP 0308712 W JP0308712 W JP 0308712W WO 2004011390 A1 WO2004011390 A1 WO 2004011390A1
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- B01D39/00—Filtering material for liquid or gaseous fluids
- B01D39/14—Other self-supporting filtering material ; Other filtering material
- B01D39/20—Other self-supporting filtering material ; Other filtering material of inorganic material, e.g. asbestos paper, metallic filtering material of non-woven wires
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Definitions
- the present invention relates to a method for producing a porous ceramic body. More specifically, the present invention relates to a method for producing a porous ceramic body in which the occurrence of cracks and the like is suppressed by controlling the rate of temperature rise in a firing atmosphere during firing.
- the production method of the present invention is applicable to the production of various types of porous ceramics. In particular, high porosity in which the temperature rise inside the compact due to the burning of the pore former during firing of the compact is remarkable. It is suitable for producing a porous ceramic honeycomb structure having a high ratio. Background art
- a porous ceramic honeycomb structure is widely used as an exhaust gas purifying means, and the method for manufacturing the porous ceramic honeycomb structure includes molding using a ceramic material to which a binder, a pore former, etc. are added. A method is performed in which a body is produced, and the formed body is dried and fired. At this time, the firing atmosphere in the firing step is generally heated at a constant rate.
- a binder an organic binder such as methylcellulose or hydroxypropylmethylcellulose is used because of good moldability.
- various pore-forming agents are used as the pore-forming agent for each purpose. However, pore-forming agents such as starch that burn at a low temperature have the advantage of being burned out at an early stage of the firing process.
- the manufacturing method in which the firing atmosphere is switched from the atmosphere to the inert gas at an early stage when the firing atmosphere temperature is low is frequently used. It is used for Also, in a manufacturing method in which a molded body is fired in an air atmosphere, such as a method for manufacturing a ceramic body made of cordierite or the like, a pore-forming agent that burns at a low temperature such as starch is used in order to increase porosity. It has been used in combination with a pore-forming agent that burns at a high temperature such as.
- the present invention has been made in view of the above-mentioned problems, and an object of the present invention is to produce a ceramic body having not only a low porosity but also a high porosity without generating cracks during firing. It is an object of the present invention to provide a method for producing a porous ceramic body which can be performed. Disclosure of the invention
- the present inventors have conducted intensive studies to solve the above-mentioned problems.
- the firing temperature reaches the burning start temperature of the binder in the firing step, the firing atmosphere is formed inside the molded body.
- a remarkable temperature rise deviating from the temperature was observed, and it was found that a large temperature difference occurred near the outer surface of the compact.
- the firing process in which the firing atmosphere temperature was increased linearly, caused the temperature rise due to the burning of the organic binder, and the chain burning of a pore-forming agent such as starch with a low firing temperature.
- the simultaneous combustion of the organic binder and the pore-forming agent caused a remarkable temperature rise inside the ceramic body which easily stored heat. Accordingly, the present inventor diligently studied to eliminate the chain combustion between the organic binder and the pore-forming agent, and as a result, when firing the molded body, the firing atmosphere temperature reached the firing temperature of the binder. From this point, it has been found that the above problem can be solved by maintaining the binder at a temperature near the combustion start temperature of the binder until the binder is burned off.
- the present invention relates to a method for producing a porous ceramic body, wherein a molded body is produced using a ceramic raw material containing a pore former and a binder, and the molded body is dried and fired.
- PC orchid 08712
- the firing atmosphere temperature is set at a temperature of 50 to +50 from the temperature at which the binder starts burning until the time when the binder is burned down.
- An object of the present invention is to provide a method for producing a porous ceramic body, which is maintained at a temperature of 10 ° C.
- the firing temperature of the binder when the green body is fired, is set to be 50 ° C. lower than the combustion start temperature of the binder until the binder is burned off. It is more preferable to maintain the temperature in a temperature range of 150 to 110 ° C.
- a binder composed of at least one selected from the group consisting of hydroxypropylmethylcellulose, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, and polyvinyl alcohol is preferable.
- the pore-forming agent used in the present invention is at least one selected from the group consisting of wheat flour, starch, phenolic resin, foamed resin, foamed foamed resin, polymethyl methacrylate, and polyethylene terephthalate. Is preferred.
- the production method of the present invention is preferably applied to the production of a honeycomb structure among porous ceramic bodies.
- Fig. 1 shows the temperature of the center of the compact and the temperature of the outer periphery (firing atmosphere) in the firing step of the present invention in which the firing atmosphere is maintained until the binder is completely burned out after reaching the burning start temperature of the binder.
- FIG. 2 is a graph showing the temperature at the center of the compact and the temperature at the outer periphery (the temperature of the baking atmosphere) in the conventional baking process in which the baking atmosphere is heated at a constant rate.
- FIG. 3 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (the temperature of the firing atmosphere) in the firing step in Example 1.
- FIG. 4 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (firing atmosphere temperature) in the firing step in Example 2.
- FIG. 5 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (the firing atmosphere temperature) in the firing step in Example 3.
- FIG. 6 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (firing atmosphere temperature) in the firing step in Example 4.
- FIG. 7 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (firing atmosphere temperature) in the firing step in Comparative Example 1.
- FIG. 8 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (the temperature of the firing atmosphere) in the firing step in Comparative Example 2.
- FIG. 9 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (firing atmosphere temperature) in the firing step in Comparative Example 3.
- FIG. 10 is a graph showing the temperature of the central portion of the molded body and the temperature of the outer peripheral portion (the temperature of the firing atmosphere) in the firing step in Comparative Example 4.
- Fig. 1 shows the shape of a molded product containing a pore former (starch) and a binder (hydroxypropylmethylcellulose) when fired by a firing program that raises the firing temperature at a constant rate. It is a graph which shows temperature transition of an outer surface and a central part.
- Fig. 2 shows that the molded body containing the pore-forming agent (starch) and the binder (hydroxypropylmethylcellulose) was heated at the combustion start temperature (220 ° C of the binder (hydroxypropylmethylcellulose)).
- the firing atmosphere temperature is the firing temperature of the binder (hydroxypropyl methylcellulose).
- the temperature reaches 20 ° C Begins to deviate from the outer surface temperature.
- the internal temperature of the molded body changes at a higher temperature than the outer surface temperature of the molded body as it is, and when it reaches 290 ° C, which is the combustion start temperature of the pore-forming agent (starch) in a short time, further increases.
- the internal temperature of the compact rapidly rises, and at peak times, is about 150 ° C higher than the outer surface temperature of the compact.
- the molded body was heated until the binder (hydroxypropylmethylcellulose) reached the combustion start temperature (220 ° C) until the binder burned down.
- the following describes a case in which firing is performed by a firing program that maintains the combustion start temperature (220 T :).
- the firing atmosphere temperature reaches 200 ° C, which is the firing temperature of the binder (hydroxypropylmethylcellulose)
- the internal temperature of the compact starts to deviate from the external surface temperature. This is similar to the case where the green body is fired by the firing program that raises the firing temperature at a constant rate as described above.
- the firing temperature was raised again, and when it reached 290 ° C, which is the combustion start temperature of the pore-forming agent (starch), the internal temperature of the molded body deviated again from the external surface temperature, and It changes above the surface temperature.
- the internal temperature of the compact is about 100 ° C higher than the external surface temperature even at the peak.
- hydroxypropylmethylcellulose was used as the binder
- starch was used as the pore-forming agent
- the firing atmosphere was kept constant at the combustion start temperature.However, when another binder or pore-forming agent was used.
- the basic principle is the same even in the case where the firing atmosphere is maintained at a fixed width while changing the firing atmosphere, and the present invention is not limited by the above description.
- a molded body is prepared from a ceramic raw material containing a pore former, a binder, and the like, and the molded body is dried.
- the ceramic raw material is not particularly limited, and examples thereof include a SiC raw material, a cordierite-forming raw material, alumina, and zirconium phosphate.
- the cordierite forming material and the ceramic material is usually a force Orin
- talc, quartz, fused silica, silica (S i 0 2) source components such as mullite, talc, magnesia, etc.
- M g O magnesite
- kaolin kaolin
- quartz, F e 2 0 3 C A_ ⁇ may be one which contains N a 2 0, K 2 ⁇ like .
- the porosity and the pore diameter of the obtained filter are controlled by controlling the types of the raw materials to be constituted or the compounding ratio thereof or controlling the particle diameters of various raw materials while maintaining the theoretical composition. You may do.
- a compound in which Si is blended so as to have a theoretical composition of Si pound Si C can be mentioned.
- the types of raw materials to be constituted or their mixing ratios or controlling the particle diameters of various raw materials the porosity and the pore diameter of the obtained filter can be improved. It may be controlled.
- Examples of the pore-forming agent used in the present invention include graphite, activated carbon such as activated carbon, foamed foamed resin such as acrylic microcapsules, foamed resin, flour, starch, phenolic resin, and polymethacrylic acid. Examples thereof include methyl, polyethylene, and polyethylene terephthalate. However, in the present invention
- the content of the pore-forming agent is not particularly limited.
- the content in the case of polymethyl methacrylate, the content is preferably 1 to 20% by mass, and in the case of polyethylene terephthalate, the content is 1 to 20% by mass.
- it is contained in an amount of from 1 to 30% by mass in the case of starch.
- each pore forming agent is contained in this range, a ceramic body having a desired high porosity can be obtained without occurrence of molding failure and firing failure.
- simultaneous firing of the binder and the pore-forming agent is cut off.
- the inside of the molded body is not fired during firing. A remarkable rise in temperature does not occur, and a ceramic body having a high porosity can be produced without generating cracks or the like.
- binder used in the present invention examples include hydroxypropylmethylcellulose, methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, and polyvinyl alcohol.
- the content of the binder is not particularly limited.
- the content in the case of hydroxypropyl methylcellulose, the content is preferably 1 to 20% by mass, and in the case of methylcellulose, it is 1 to 20% by mass.
- additives can be contained as necessary.
- a molding aid or a dispersant may be contained.
- molding aid examples include stearic acid, oleic acid, lauric acid, ethylene glycol, and trimethylene glycol.
- dispersing agent examples include dextrin and fatty acid stone. , Or polyalcohol.
- any method may be used as appropriate.
- Babai which manufactures a ceramic 82-cam structure that is used as an exhaust gas purification filter
- water is added to a ceramic material such as a cordierite-forming material, a SiC material, and the like.
- a raw material is prepared by adding a desired amount of an agent, a binder, and a dispersant used as necessary, and a raw material is prepared, and the raw material is kneaded to form a kneaded clay.
- Examples of the method for forming the kneaded clay include an extrusion molding method, an injection molding method, and a press molding method. Among them, continuous molding is easy, and the ceramic crystal is oriented at low heat. It is preferable to carry out the extrusion molding method in that it can be expanded.
- Examples of the method for drying the molded body include hot-air drying, microwave drying, dielectric drying, reduced-pressure drying, vacuum drying, and freeze-drying.
- a suitable method is selected according to the ceramic raw material used. Is preferred.
- hot air drying, microwave drying, or dielectric drying can be used because the whole can be dried quickly and uniformly. It is preferable to carry out in a drying step in which is combined.
- the obtained molded body is subjected to a specific heating program, that is, the firing atmosphere temperature is changed from the time when the burning start temperature of the binder to be used is reached to the time when the binder is burned out.
- a specific heating program that is, the firing atmosphere temperature is changed from the time when the burning start temperature of the binder to be used is reached to the time when the binder is burned out.
- Up to 50% of the binder's firing temperature Baking is performed by a temperature raising program that maintains the temperature in the range of ⁇ 10 oC.
- combustion start temperature refers to each binder as shown in FIG.
- the combustion start temperature is, for example, 220 ° C. for hydroxypropyl methylcellulose.
- the temperature of methyl cellulose is 220 ° C.
- these binders are kneaded together with the ceramic raw material and are present in the molded body, they may change depending on factors other than the characteristics of the binder itself.
- the point at which the binder is burned out means, as shown in FIG. 1, after the center temperature of the molded body has deviated from the firing atmosphere temperature (outer surface temperature) due to the start of burning of the binder.
- the time at which the binder is burned out varies depending on various conditions such as the type, particle size, and content of the binder, and the holding temperature. It is preferable to hold for a time. Specifically, when firing a molded body containing 1 to 10% by mass of methylcellulose as a binder in all components while maintaining the firing atmosphere temperature at about 170 to 230 ° C. After the firing atmosphere temperature reaches about 220 ° C. (combustion start temperature of methylcellulose), the temperature is maintained for 2 hours or more, preferably 3 hours or more, more preferably 4 hours or more, and particularly preferably 5 hours or more. Good.
- a molded body containing 1 to 10% by mass of hydroxypropyl methylcellulose as a binder in all components is fired while maintaining the firing atmosphere temperature constant at 170 to 230 ° C.
- the sintering atmosphere temperature reaches about 220 ° C. (combustion start temperature of hydroxypropylmethylcellulose)
- the sintering time is preferably 2 hours or more, preferably 3 hours or more, more preferably 4 hours or more, and particularly preferably. Should be kept for more than 5 hours.
- the term “maintain the firing atmosphere temperature” means, of course, a constant temperature in the temperature range of 150 to 110 ° C. with respect to the binder combustion start temperature. This includes the case where the temperature is varied within the temperature range.
- the lower limit of the temperature range for maintaining the firing atmosphere temperature is based on the combustion start temperature of the binder having the lowest combustion start temperature, and the upper limit is the combustion start temperature. Is based on the combustion start temperature of the binder, which is the highest temperature.
- the firing atmosphere temperature in the present invention is more preferably in a temperature range of 130 to 0 ° C, and more preferably in a temperature range of 120 to 0 ° C, with respect to the combustion start temperature of the binder used. Is particularly preferred.
- the firing atmosphere temperature is from ⁇ 50 ° C. to 10 ° C. with respect to the binder combustion start temperature from the time when the temperature reaches 50 ° C. lower than the combustion start temperature to the time when the binder is burned out. It is preferable to maintain the temperature in the temperature range of C.
- the binder can be removed by using a decomposition reaction that does not generate heat before the combustion start temperature is reached, and a rapid rise in the internal temperature of the molded body due to the subsequent combustion phenomenon is prevented. It is possible to further reduce, and further, it is possible to more completely eliminate the chain burning of the pore forming agent caused by the burning of the binder.
- the binder to be used is The temperature is more preferably in the range of 130 to 0 ° C with respect to the combustion start temperature, and particularly preferably in the range of ⁇ 20 to 0 ° C.
- the firing step in the present invention is not particularly limited except that the firing atmosphere temperature is maintained for a specific time in a specific temperature range, and the firing atmosphere temperature is maintained at a constant rate outside the specific temperature range. May be raised.
- the heating rate of the firing atmosphere is set within a range where control is easy, and at a rate of 5 to 200 ° CZ hr.
- the firing atmosphere is preferably filled with an appropriate gas depending on the ceramic raw material to be used.
- an appropriate gas depending on the ceramic raw material to be used.
- a ceramic raw material which is burned in an aerobic state such as a SiC raw material
- binder, and a r when the additive is destroyed the pore forming agent it is preferable to replace the atmosphere with N 2 or the like, as such co-one cordierite, in the case of material to be ceramic by aerobic conditions
- the air atmosphere may be used.
- the method of manufacturing a porous ceramic body according to the present invention has been described above, but the manufacturing method is applicable to various porous ceramic bodies regardless of shape, size, structure, and the like. However, since the combustion of the pore-forming agent is promoted, the temperature difference between the firing atmosphere and the central portion is likely to be large, so that it can be particularly preferably applied to a method for producing a porous honeycomb structure having a high porosity.
- the temperature of the center of the formed body and the temperature of the firing atmosphere were measured with an R thermocouple, and the difference between the two was determined.
- the presence or absence of cracks was visually checked for 100 honeycomb structures manufactured based on each of the examples and comparative examples.
- this kneaded material was extruded, formed into a honeycomb shape, microwave-dried, and then absolutely dried by hot air drying.
- the firing atmosphere temperature was kept constant until 5 hours, when hydroxypropoxyl methylcellulose was completely burned out, and the firing atmosphere was heated to 400 ° C at a rate of 30 ° C / hr. Thereafter, the firing atmosphere temperature was switched to Ar, and firing was performed by a heating program in which the firing atmosphere temperature was raised to 1450 ° C.
- Table 1 shows the manufacturing conditions and the evaluation results
- Fig. 3 shows the changes in the temperature at the center of the compact and the temperature at the outer periphery (firing atmosphere temperature) in the firing step.
- An 82 cam filter was manufactured in the same manner as in Example 1, except that the firing atmosphere was changed according to the heating program shown in Table 1.
- the manufacturing conditions and the evaluation results are shown in Table 1, and the changes in the temperature of the central part of the compact and the temperature of the outer surface (firing atmosphere temperature) in the firing step are shown in Figs.
- the ambient temperature is 30 ° C / hr before and after the temperature is maintained at a constant value.
- the method for producing a porous ceramic body of the present invention even when producing a ceramic body having not only low porosity but also high porosity, cracks can be generated by firing. Thus, a porous ceramics body can be manufactured without any problem. Particularly, in a manufacturing method using a pore-forming agent having a low combustion start temperature, the effect is remarkable. Further, the production method of the present invention can be applied as a method for producing various ceramic bodies, and particularly preferably as a method for producing a ceramic honeycomb structure.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03771260A EP1541538B1 (en) | 2002-07-26 | 2003-07-09 | Method for producing porous ceramic article |
US10/522,011 US7544320B2 (en) | 2002-07-26 | 2003-07-09 | Method of manufacturing porous ceramic body |
AU2003252489A AU2003252489A1 (en) | 2002-07-26 | 2003-07-09 | Method for producing porous ceramic article |
DE60335555T DE60335555D1 (de) | 2002-07-26 | 2003-07-09 | Enstands |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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JP2002217941A JP4311609B2 (ja) | 2002-07-26 | 2002-07-26 | 多孔質セラミックス体の製造方法 |
JP2002-217941 | 2002-07-26 |
Publications (1)
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WO2004011390A1 true WO2004011390A1 (ja) | 2004-02-05 |
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ID=31184662
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PCT/JP2003/008712 WO2004011390A1 (ja) | 2002-07-26 | 2003-07-09 | 多孔質セラミックス体の製造方法 |
Country Status (8)
Country | Link |
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US (1) | US7544320B2 (ja) |
EP (1) | EP1541538B1 (ja) |
JP (1) | JP4311609B2 (ja) |
KR (1) | KR100636727B1 (ja) |
AU (1) | AU2003252489A1 (ja) |
DE (1) | DE60335555D1 (ja) |
PL (1) | PL208358B1 (ja) |
WO (1) | WO2004011390A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9315425B2 (en) | 2013-10-28 | 2016-04-19 | Universiti Brunei Darussalam | Macroporous ceramic body, method of manufacture and uses thereof |
CN115521140A (zh) * | 2022-08-10 | 2022-12-27 | 中山大学 | 一种焦磷酸盐固溶体多孔陶瓷及其制备方法和应用 |
Families Citing this family (19)
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JP4699885B2 (ja) * | 2005-12-02 | 2011-06-15 | 日本碍子株式会社 | ハニカム構造体の製造方法 |
JP2010501467A (ja) * | 2006-08-25 | 2010-01-21 | コーニング インコーポレイテッド | 低背圧の多孔質コージエライトセラミックハニカム物品およびその製造方法 |
JP5338317B2 (ja) * | 2006-09-29 | 2013-11-13 | 日立金属株式会社 | コージェライト質セラミックハニカムフィルタの製造方法 |
RU2346971C2 (ru) * | 2006-12-27 | 2009-02-20 | Шлюмбергер Текнолоджи Б.В. | Проппант, способ его получения и способ его применения |
WO2009017688A2 (en) * | 2007-07-31 | 2009-02-05 | Corning Incorporated | Carbon pore formers for dielectric drying |
US20090298670A1 (en) * | 2008-05-27 | 2009-12-03 | Martin Joseph Murtagh | Method for removing graphite from cordierite bodies |
US8444737B2 (en) * | 2009-02-27 | 2013-05-21 | Corning Incorporated | Ceramic structures and methods of making ceramic structures |
FR2943928B1 (fr) | 2009-04-02 | 2012-04-27 | Saint Gobain Ct Recherches | Structure filtrante a base de sic a proprietes thermomecaniques ameliorees |
CN102459125A (zh) | 2009-06-05 | 2012-05-16 | 康宁股份有限公司 | 形成堇青石的批料及其使用方法 |
US20110152850A1 (en) * | 2009-06-23 | 2011-06-23 | Niedbala R Sam | Devices and methods for dispensing a cryogenic fluid |
US8647337B2 (en) * | 2009-06-23 | 2014-02-11 | Stc Consulting, Llc | Devices and methods for dispensing a cryogenic fluid |
US9097463B2 (en) | 2010-02-23 | 2015-08-04 | Ngk Insulators, Ltd. | Housing for heating and use method of the same, heating jig and use method of the same, and operation method of heating device |
FR2965489B1 (fr) | 2010-09-30 | 2013-03-29 | Saint Gobain Ct Recherches | Structure en nid d'abeille microfissuree. |
EP2748121A4 (en) * | 2011-08-24 | 2015-05-06 | Polyvalor Société En Commandite | POROUS SIC CERAMIC AND METHOD OF MANUFACTURING |
US9133062B2 (en) * | 2012-11-21 | 2015-09-15 | Corning Incorporated | Method of firing cordierite bodies |
JP6067394B2 (ja) * | 2013-01-31 | 2017-01-25 | 東京窯業株式会社 | 焼成治具 |
US9999879B2 (en) | 2013-05-30 | 2018-06-19 | Corning Incorporated | Formed ceramic substrate composition for catalyst integration |
US10479734B2 (en) | 2013-08-15 | 2019-11-19 | Corning Incorporated | Method and apparatus for thermally debindering a cellular ceramic green body |
US9670762B2 (en) | 2015-02-20 | 2017-06-06 | Halliburton Energy Services, Inc. | Fracturing tight subterranean formations with a cement composition |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0357789A1 (en) * | 1988-02-10 | 1990-03-14 | Ngk Insulators, Ltd. | Process of producing a ceramic honeycomb structural body |
JPH10273366A (ja) * | 1997-03-28 | 1998-10-13 | Ngk Insulators Ltd | セラミック成形体の焼成方法 |
JP2001316190A (ja) * | 2000-05-02 | 2001-11-13 | Shinagawa Refract Co Ltd | 多孔質焼結体の焼成方法とその装置 |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS57119843A (en) * | 1981-01-20 | 1982-07-26 | Kobe Steel Ltd | Calcining method for catalyst carrier molding |
JP2543565B2 (ja) | 1988-03-31 | 1996-10-16 | 日本碍子株式会社 | セラミックスの焼成に用いるトンネル炉 |
WO1999028268A1 (en) * | 1997-12-02 | 1999-06-10 | Corning Incorporated | Method for firing ceramic honeycomb bodies |
CN1093521C (zh) * | 1997-12-02 | 2002-10-30 | 康宁股份有限公司 | 陶瓷蜂蜜体的烧制方法 |
CN1174210C (zh) * | 1997-12-02 | 2004-11-03 | 康宁股份有限公司 | 用于烧制陶瓷蜂窝体的隧道窑 |
JP4723085B2 (ja) * | 1997-12-22 | 2011-07-13 | コーニング インコーポレイテッド | セラミックハニカム体の焼成方法及び焼成に用いられるトンネルキルン |
US6287510B1 (en) * | 1999-11-23 | 2001-09-11 | Corning Incorporated | Method of firing green structures containing organics |
-
2002
- 2002-07-26 JP JP2002217941A patent/JP4311609B2/ja not_active Expired - Fee Related
-
2003
- 2003-07-09 WO PCT/JP2003/008712 patent/WO2004011390A1/ja active Application Filing
- 2003-07-09 AU AU2003252489A patent/AU2003252489A1/en not_active Abandoned
- 2003-07-09 KR KR1020057001449A patent/KR100636727B1/ko active IP Right Grant
- 2003-07-09 DE DE60335555T patent/DE60335555D1/de not_active Expired - Lifetime
- 2003-07-09 US US10/522,011 patent/US7544320B2/en active Active
- 2003-07-09 PL PL373646A patent/PL208358B1/pl unknown
- 2003-07-09 EP EP03771260A patent/EP1541538B1/en not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0357789A1 (en) * | 1988-02-10 | 1990-03-14 | Ngk Insulators, Ltd. | Process of producing a ceramic honeycomb structural body |
JPH10273366A (ja) * | 1997-03-28 | 1998-10-13 | Ngk Insulators Ltd | セラミック成形体の焼成方法 |
JP2001316190A (ja) * | 2000-05-02 | 2001-11-13 | Shinagawa Refract Co Ltd | 多孔質焼結体の焼成方法とその装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1541538A4 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9315425B2 (en) | 2013-10-28 | 2016-04-19 | Universiti Brunei Darussalam | Macroporous ceramic body, method of manufacture and uses thereof |
CN115521140A (zh) * | 2022-08-10 | 2022-12-27 | 中山大学 | 一种焦磷酸盐固溶体多孔陶瓷及其制备方法和应用 |
CN115521140B (zh) * | 2022-08-10 | 2023-09-19 | 中山大学 | 一种焦磷酸盐固溶体多孔陶瓷及其制备方法和应用 |
Also Published As
Publication number | Publication date |
---|---|
US7544320B2 (en) | 2009-06-09 |
EP1541538A4 (en) | 2007-07-11 |
US20050242455A1 (en) | 2005-11-03 |
PL208358B1 (pl) | 2011-04-29 |
AU2003252489A1 (en) | 2004-02-16 |
KR100636727B1 (ko) | 2006-10-23 |
DE60335555D1 (de) | 2011-02-10 |
JP4311609B2 (ja) | 2009-08-12 |
EP1541538A1 (en) | 2005-06-15 |
KR20050030959A (ko) | 2005-03-31 |
PL373646A1 (en) | 2005-09-05 |
JP2004059357A (ja) | 2004-02-26 |
EP1541538B1 (en) | 2010-12-29 |
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