JP6734914B2 - セラミックス成形体の製造方法 - Google Patents
セラミックス成形体の製造方法 Download PDFInfo
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- JP6734914B2 JP6734914B2 JP2018504338A JP2018504338A JP6734914B2 JP 6734914 B2 JP6734914 B2 JP 6734914B2 JP 2018504338 A JP2018504338 A JP 2018504338A JP 2018504338 A JP2018504338 A JP 2018504338A JP 6734914 B2 JP6734914 B2 JP 6734914B2
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/10—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam
- C04B38/103—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by using foaming agents or by using mechanical means, e.g. adding preformed foam the foaming being obtained by the introduction of a gas other than untreated air, e.g. nitrogen
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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
- B28B1/24—Producing shaped prefabricated articles from the material by injection moulding
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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
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
- B28B3/20—Producing shaped articles from the material by using presses; Presses specially adapted therefor wherein the material is extruded
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/638—Removal thereof
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0006—Honeycomb structures
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
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- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
- C04B38/063—Preparing or treating the raw materials individually or as batches
- C04B38/0635—Compounding ingredients
- C04B38/0645—Burnable, meltable, sublimable materials
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00034—Physico-chemical characteristics of the mixtures
- C04B2111/00129—Extrudable mixtures
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6021—Extrusion moulding
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/60—Aspects relating to the preparation, properties or mechanical treatment of green bodies or pre-forms
- C04B2235/602—Making the green bodies or pre-forms by moulding
- C04B2235/6022—Injection moulding
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
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- Compositions Of Oxide Ceramics (AREA)
Description
上記したセラミックス成形体の製造方法、及び成形体製造装置を用いて、セラミックス成形体である二種類のハニカム成形体(実施例1及び比較例1)を形成した。ここで、実施例1のハニカム成形体は、超臨界CO2生成供給装置(昭和電工ガスプロダクツ製)を用いて超臨界流体(超臨界CO2)の注入を行ったものであり、比較例1は、実施例1と同一条件下で、超臨界流体の注入を行わなかったものである。なお、形成されたハニカム構造体は、ハニカム径が40mmの円柱状を呈し、コージェライトを主成分とし、成形原料中に通常の造孔材を含むものである。ここで、実施例1のハニカム成形体は、成形原料の単位時間当たりの押出量が10kg/hであり、一方、超臨界CO2生成供給装置によって供給される超臨界流体の単位時間当たりの注入量は、0.4kg/h、更に、注入圧力は30MPaに設定したものである。
それぞれ得られた実施例1及び比較例1のハニカム成形体を同一の乾燥条件で乾燥し、更に同一の焼成条件で焼成し、得られたハニカム構造体の隔壁の気孔径及び細孔容積の測定を行った。気孔径及び細孔容積は、従来から周知の測定手法である、水銀圧入法、またはアルキメデス法を適宜用いることによって測定した。その結果を表1及び図4に示す。
図4に示すように、比較例1に対し、実施例1のハニカム構造体の気孔径及び細孔容積の対数の値、及び気孔率がいずれも上昇していることが確認される(図中矢印参照)。すなわち、超臨界CO2の注入によって、ハニカム構造体の隔壁内部の気孔径が大きくなり、かつ細孔容積も増大している。そのため、超臨界CO2の注入によって高気孔率構造のセラミックス構造体を製造可能なことが確認された。
Claims (4)
- セラミックス成形体を形成するための原料を乾式混合した後、得られた乾式混合物に液体を添加して湿式混合する混合工程と、
前記混合工程によって得られた混合物を混練する混練工程と、
前記混練工程によって得られた混練物に、超臨界流体の状態の超臨界二酸化炭素を注入する注入工程と、
前記混練工程及び前記注入工程によって得られた、前記超臨界二酸化炭素を含む成形原料を押出成形し、セラミックス成形体を形成する成形工程と
を備え、
前記注入工程は、
前記成形原料を押出成形する口金に近接する位置に、前記超臨界二酸化炭素を注入する注入位置が設定されるセラミックス成形体の製造方法。 - 前記注入工程における前記超臨界二酸化炭素の単位時間当たりの注入量は、
前記成形工程における前記成形原料の単位時間当たりの押出量に対し、1.5体積%〜20.0体積%の範囲である請求項1に記載のセラミックス成形体の製造方法。 - 前記注入工程における前記超臨界二酸化炭素の注入圧力は、
15MPa〜35MPaの範囲である請求項1または2に記載のセラミックス成形体の製造方法。 - 前記成形原料は、
造孔材を含んでいる請求項1〜3のいずれか一項に記載のセラミックス成形体の製造方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016045325 | 2016-03-09 | ||
JP2016045325 | 2016-03-09 | ||
PCT/JP2017/006197 WO2017154544A1 (ja) | 2016-03-09 | 2017-02-20 | セラミックス成形体の製造方法 |
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JPWO2017154544A1 JPWO2017154544A1 (ja) | 2019-01-10 |
JP6734914B2 true JP6734914B2 (ja) | 2020-08-05 |
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JP2018504338A Active JP6734914B2 (ja) | 2016-03-09 | 2017-02-20 | セラミックス成形体の製造方法 |
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US (1) | US11578006B2 (ja) |
JP (1) | JP6734914B2 (ja) |
CN (1) | CN108712949B (ja) |
DE (1) | DE112017001194T5 (ja) |
WO (1) | WO2017154544A1 (ja) |
Families Citing this family (1)
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CN110218066B (zh) * | 2019-05-31 | 2021-11-12 | 宜昌鄂中生态工程有限公司 | 一种微孔发泡石膏板材及其方法 |
Family Cites Families (12)
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US5021213A (en) * | 1989-06-22 | 1991-06-04 | Nkk Corporation | Method of casting powder |
US5884138A (en) * | 1996-06-10 | 1999-03-16 | Corning Incorporated | Method for improving the stiffness of extrudates |
US5935514A (en) * | 1997-01-23 | 1999-08-10 | Corning Incorporated | Method for extrusion of powder mixtures using supercritical fluids |
JPH11236279A (ja) * | 1998-02-25 | 1999-08-31 | Koichi Shimada | 多孔質セラミックス焼結体およびその製造方法 |
US6759004B1 (en) * | 1999-07-20 | 2004-07-06 | Southco, Inc. | Process for forming microporous metal parts |
GB0030182D0 (en) * | 2000-12-11 | 2001-01-24 | Univ Brunel | Material processing |
JP2004010373A (ja) * | 2002-06-04 | 2004-01-15 | Nagamine Seisakusho:Kk | 焼結品およびその製造方法 |
US20060257620A1 (en) * | 2003-08-20 | 2006-11-16 | Ngk Insulators, Ltd. | Method for manufacturing honeycomb formed article, method for manufacturing honeycomb filter, and honeycomb filter |
FR2915405B1 (fr) * | 2007-04-30 | 2011-09-09 | Areva Np | Preparation de particules minerales en milieu co2 supercritique |
JP4571990B2 (ja) | 2008-03-31 | 2010-10-27 | 日本碍子株式会社 | ハニカム構造体の製造方法 |
US8679385B2 (en) | 2010-11-29 | 2014-03-25 | Corning Incorporated | Method of forming porous ceramic articles using inert gas |
CN103009540B (zh) * | 2011-09-28 | 2015-03-04 | 深圳光启高等理工研究院 | 一种基于介电常数可控的超材料基板及其制备方法 |
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2017
- 2017-02-20 WO PCT/JP2017/006197 patent/WO2017154544A1/ja active Application Filing
- 2017-02-20 DE DE112017001194.9T patent/DE112017001194T5/de active Pending
- 2017-02-20 CN CN201780012431.1A patent/CN108712949B/zh active Active
- 2017-02-20 JP JP2018504338A patent/JP6734914B2/ja active Active
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- 2018-08-21 US US16/106,215 patent/US11578006B2/en active Active
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Publication number | Publication date |
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DE112017001194T5 (de) | 2018-11-15 |
JPWO2017154544A1 (ja) | 2019-01-10 |
CN108712949A (zh) | 2018-10-26 |
US20180354863A1 (en) | 2018-12-13 |
US11578006B2 (en) | 2023-02-14 |
CN108712949B (zh) | 2020-02-07 |
WO2017154544A1 (ja) | 2017-09-14 |
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