WO2003072525A1 - Keramische massen mit hohem feststoffanteil zur herstellung keramischer werkstoffe und produkte mit geringem schwund - Google Patents
Keramische massen mit hohem feststoffanteil zur herstellung keramischer werkstoffe und produkte mit geringem schwund Download PDFInfo
- Publication number
- WO2003072525A1 WO2003072525A1 PCT/DE2003/000714 DE0300714W WO03072525A1 WO 2003072525 A1 WO2003072525 A1 WO 2003072525A1 DE 0300714 W DE0300714 W DE 0300714W WO 03072525 A1 WO03072525 A1 WO 03072525A1
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- WO
- WIPO (PCT)
- Prior art keywords
- ceramic
- solids content
- fraction
- fractions
- vol
- Prior art date
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Classifications
-
- 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
- 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
- C04B35/62605—Treating the starting powders individually or as mixtures
- C04B35/62625—Wet mixtures
- C04B35/6263—Wet mixtures characterised by their solids loadings, i.e. the percentage of solids
-
- 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
- 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
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5436—Particle size related information expressed by the size of the particles or aggregates thereof micrometer sized, i.e. from 1 to 100 micron
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
- C04B2235/5445—Particle size related information expressed by the size of the particles or aggregates thereof submicron sized, i.e. from 0,1 to 1 micron
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/54—Particle size related information
- C04B2235/5463—Particle size distributions
- C04B2235/5472—Bimodal, multi-modal or multi-fraction
-
- 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
- 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
-
- 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
- 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
-
- 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
- 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
- C04B2235/6027—Slip casting
Definitions
- the invention relates to ceramic compositions for molding ceramic materials and / or products by plastic shaping (extrusion, injection molding) or casting (film casting, slip casting).
- Ceramic masses consist of ceramic powders, an aqueous dispersion medium and one or more binders, the so-called binder.
- This binder contains water-soluble or water-swellable polymer materials.
- mineral raw materials are ground into powder, granulated and prepared into ceramic masses by adding water, plasticizers, solidifying agents and / or sintering aids.
- the shaping takes place with these materials. This can be done by pressing, plastic forming (extrusion, injection molding) or casting (film casting, slip casting). After shaping, it is dried. The material shrinks due to the volatile constituents escaping during drying, essentially water. After shaping by casting or injection molding, the shrinkage is up to 70% by volume, since the masses contain up to 70% water to ensure the required flowability.
- the green bodies obtained after drying are optionally processed mechanically. After this processing, sintering (firing) takes place. This is done by pyrolysis of the polymer components. In the event of fire, the material shrinks by a further 20 to 30%.
- the volume shrinkage of the ceramic during drying and sintering depends on the proportion of the aqueous and polymeric dispersion medium that is required for the processability of the ceramic masses. Here it applies that this proportion is all the greater is, the more complex shapes are to be realized and the better the masses have to flow during molding by injection molding or extrusion. While a moisture content of 5 - 10% is sufficient for pressing, approx. 25 to 30% water content is required for extrusion and approx. 60 - 70% for casting. Due to the volume shrinkage occurring during drying and sintering, it is hardly possible to realize the specifications of the three-dimensional dimensions of the ceramic products without post-processing. Therefore, mechanical reworking is required in most cases. In view of the hardness of ceramic materials, however, post-processing involves considerable effort and cost.
- the object of the present invention is to increase the solids content in ceramic compositions while maintaining good processability in order to minimize the shrinkage during drying, debinding and / or sintering of the ceramic.
- the invention relates to ceramic compositions which can be processed by extrusion, casting and / or injection molding and which have a solids content of at least 60% by volume, the solids content being a combination of at least two fractions, so-called powder fractions, with different particle size distributions.
- the invention also relates to the use of these ceramic materials for producing high-quality ceramic materials with little shrinkage.
- the ceramic compositions according to the invention advantageously comprise a combination of at least two solid fractions which differ in their average particle size by a factor of 4-5.
- D is preferably 5 o- particle size of the smaller (finer or more finely divided) particle fraction of ⁇ 1 micron and the larger (coarser, coarser) particle fraction 1 - lO ⁇ m.
- the ceramic compositions according to the invention comprise a combination of three solid fractions which differ in terms of their particle size.
- the D 50 particle size of the smallest particle fraction is preferably ⁇ 1 ⁇ m, that of the middle particle fraction 1-10 ⁇ m and that of the largest particle fraction> 10 ⁇ m.
- the solids fractions can have any distribution of the Dao / Dio ratio. However, they preferably have a narrow distribution, particularly preferably they have a narrow distribution with a Dgo / Dio ratio of 2 to 50, preferably 3 to 30.
- the ceramic compositions comprise a bimodal solid mixture in which the volume fraction of the more finely divided particle fraction is between 5 and 50% by volume, preferably between 10 and 25% by volume, based on the total solid.
- the ceramic compositions comprise a trimodal solid mixture in which, for example, the volume fraction of the coarse particle fraction is between 40 to 60% by volume, that of the average particle fraction between 20 to 30 and that of the fine particle fraction. Fraction is also between 20 to 30 vol .-%, based on the total solid.
- the liquid portion of the ceramic compositions according to the invention comprises commercial plasticizers, plasticizers, solidifiers and sintering aids.
- the proportion of ceramic solid is increased compared to conventional compositions by means of tailored particle size distribution without an increase in viscosity restricting the processability of the compositions.
- the increased solids content in these masses results in a higher quality of the resulting ceramic products as well as a reduced expenditure of time and energy for the production of these products.
- the invention relates to ceramic compositions for producing ceramic materials and products with low shrinkage.
- the masses can be processed by extrusion, injection molding or casting and contain, compared to conventional ceramic masses, a powder fraction of at least 60% by volume, without an increase in viscosity limiting the processability of the masses.
- the solids content can be increased by bimodal or multimodal distribution of the ceramic powders.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Ceramic Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03714683A EP1478604A1 (de) | 2002-02-28 | 2003-02-28 | Keramische massen mit hohem feststoffanteil zur herstellung keramischer werkstoffe und produkte mit geringem schwund |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE10208742.3 | 2002-02-28 | ||
DE10208742 | 2002-02-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2003072525A1 true WO2003072525A1 (de) | 2003-09-04 |
Family
ID=27762502
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/000714 WO2003072525A1 (de) | 2002-02-28 | 2003-02-28 | Keramische massen mit hohem feststoffanteil zur herstellung keramischer werkstoffe und produkte mit geringem schwund |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP1478604A1 (de) |
WO (1) | WO2003072525A1 (de) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004096728A1 (de) * | 2003-04-29 | 2004-11-11 | Siemens Aktiengesellschaft | Verfahren zur modellierung der packungsdichte von aus körnigen partikeln bestehender füllstoffe in polymerwerkstoffen |
WO2005033203A1 (de) * | 2003-09-30 | 2005-04-14 | Siemens Aktiengesellschaft | Vergussmasse, verwendung dazu und mit der vergussmasse umhüllte bauelemente |
EP1733263B1 (de) * | 2004-03-29 | 2009-01-28 | Albis Plastic GmbH | Beleuchtbare informationseinheit |
DE102009005446A1 (de) | 2009-01-21 | 2010-07-22 | Schott Ag | Granulat, Verfahren zu dessen Herstellung sowie dessen Verwendung |
DE102012211762A1 (de) * | 2012-07-05 | 2014-01-09 | Siemens Aktiengesellschaft | Formulierung, Verwendung der Formulierung und Isoliersystem für rotierende elektrische Maschinen |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0147478A1 (de) * | 1983-12-23 | 1985-07-10 | Hoechst CeramTec Aktiengesellschaft | Schlickergiessmasse zur Herstellung von Formkörpern als aus Siliciumcarbid |
US4929579A (en) * | 1988-06-29 | 1990-05-29 | Premier Refractories & Chemicals Inc. | Method of manufacturing cast fused silica articles |
EP0662462A2 (de) * | 1994-01-05 | 1995-07-12 | Hoechst CeramTec Aktiengesellschaft | Verfahren zum Herstellen von keramischen Bauteilen aus Siliziumcarbid |
EP0725047A1 (de) * | 1995-01-31 | 1996-08-07 | Robert Bosch Gmbh | Schlickerzusammensetzung, insbesondere zum Foliengiessen |
US5641920A (en) * | 1995-09-07 | 1997-06-24 | Thermat Precision Technology, Inc. | Powder and binder systems for use in powder molding |
WO2001017902A1 (de) * | 1999-09-09 | 2001-03-15 | Wacker-Chemie Gmbh | HOCHGEFÜLLTE SiO2-DISPERSION, VERFAHREN ZU IHRER HERSTELLUNG UND VERWENDUNG |
-
2003
- 2003-02-28 WO PCT/DE2003/000714 patent/WO2003072525A1/de not_active Application Discontinuation
- 2003-02-28 EP EP03714683A patent/EP1478604A1/de not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0147478A1 (de) * | 1983-12-23 | 1985-07-10 | Hoechst CeramTec Aktiengesellschaft | Schlickergiessmasse zur Herstellung von Formkörpern als aus Siliciumcarbid |
US4929579A (en) * | 1988-06-29 | 1990-05-29 | Premier Refractories & Chemicals Inc. | Method of manufacturing cast fused silica articles |
EP0662462A2 (de) * | 1994-01-05 | 1995-07-12 | Hoechst CeramTec Aktiengesellschaft | Verfahren zum Herstellen von keramischen Bauteilen aus Siliziumcarbid |
EP0725047A1 (de) * | 1995-01-31 | 1996-08-07 | Robert Bosch Gmbh | Schlickerzusammensetzung, insbesondere zum Foliengiessen |
US5641920A (en) * | 1995-09-07 | 1997-06-24 | Thermat Precision Technology, Inc. | Powder and binder systems for use in powder molding |
WO2001017902A1 (de) * | 1999-09-09 | 2001-03-15 | Wacker-Chemie Gmbh | HOCHGEFÜLLTE SiO2-DISPERSION, VERFAHREN ZU IHRER HERSTELLUNG UND VERWENDUNG |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004096728A1 (de) * | 2003-04-29 | 2004-11-11 | Siemens Aktiengesellschaft | Verfahren zur modellierung der packungsdichte von aus körnigen partikeln bestehender füllstoffe in polymerwerkstoffen |
WO2005033203A1 (de) * | 2003-09-30 | 2005-04-14 | Siemens Aktiengesellschaft | Vergussmasse, verwendung dazu und mit der vergussmasse umhüllte bauelemente |
EP1733263B1 (de) * | 2004-03-29 | 2009-01-28 | Albis Plastic GmbH | Beleuchtbare informationseinheit |
DE102009005446A1 (de) | 2009-01-21 | 2010-07-22 | Schott Ag | Granulat, Verfahren zu dessen Herstellung sowie dessen Verwendung |
DE102012211762A1 (de) * | 2012-07-05 | 2014-01-09 | Siemens Aktiengesellschaft | Formulierung, Verwendung der Formulierung und Isoliersystem für rotierende elektrische Maschinen |
Also Published As
Publication number | Publication date |
---|---|
EP1478604A1 (de) | 2004-11-24 |
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