UST909004I4 - Calendering poctor blade cast ceramic sheets to control anisotropic firing shinkage - Google Patents
Calendering poctor blade cast ceramic sheets to control anisotropic firing shinkage Download PDFInfo
- Publication number
- UST909004I4 UST909004I4 US909004DH UST909004I4 US T909004 I4 UST909004 I4 US T909004I4 US 909004D H US909004D H US 909004DH US T909004 I4 UST909004 I4 US T909004I4
- Authority
- US
- United States
- Prior art keywords
- anisotropy
- sheet
- firing
- shrinkage
- casting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- 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
- C04B35/63—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
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/6342—Polyvinylacetals, e.g. polyvinylbutyral [PVB]
-
- 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
- C04B33/00—Clay-wares
- C04B33/24—Manufacture of porcelain or white ware
-
- 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
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
-
- 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
- C04B35/63—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
- C04B35/632—Organic additives
- C04B35/634—Polymers
Definitions
- a green ceramic sheet produced by doctor blade casting of a particulate slip containing, e.g., finely divided alumina, polyvinyl butyral, dibutyl phthalate, a wetting agent and a solvent for the polyvinyl butyral, is characterized by shrinkage anisotropy, i.e., the shrinkage of the sheet measured after firing is less in the casting direction than in the transverse direction.
- This anisotropy can be substantially eliminated by subjecting the green sheet to an experimentally determined thickness reduction achieved by passing the dried sheets through a series of pressurized rolls which also elongates and densifies the dried sheet.
- Factors that are significant to the effect of thickness reduction on the elimination of shrinkage anisotropy are temperature, roll diameter, roll pressure, roll speed, and the composition of the casting slip.
- shape of the doctor blade and the material used in its construction can be specially designed and selected to reduce shrinkage anisotropy.
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
A GREEN CERAMIC SHEET PRODUCED BY DOCTOR BLADE CASTING OF A PARTICULATE SLIP CONTAINING, E.G., FINELY DIVIDED ALUMINA, POLYVINYL BUTYRAL, DIBUTYL PHTHALATE, A WETTING AGENT AND A SOLVENT FOR THE POLYVINYL BUTYRAL, IS CHARACTERIZED BY SHRINKAGE ANISOTROPY,I.E., THE SHRINKAGE OF THE SHEET MEASURED AFTER FIRING IS LESS IN THE CASTING DIRECTION THAN IN THE TRANSVERSE DIRECTION. THIS ANISOTROPY CAN BE SUBSTANTIALLY ELIMINATED BY SUBJECTING THE GREEN SHEET TO AN EXPERIMENTALLY DETERMINED THICKNESS REDUCTION ACHIVED BY PASSING THE DRIED SHEETS THROUGH A SERIES OF PESSURIZED ROLLS WHICH ALSO ELONGATES AND DENSIFIED THE DRIED SHEET. FACTORS THAT ARE SIGNIFICANT TO THE EFFECT OF THICKNESS REDUCTION ON THE ELIMINATION OF SHRINKAGE ANISOTROPY ARE TEMPERATURE, ROLL DIAMETER, ROLL PRESSURE, ROLL SPEED, AND THE COMPOSITION OF THE CASTING SLIP. ALSO, ANOTHER APPLICATION IS MENTIONED WHEREIN THE SHAPE OF THE DOCTOR BLADE AND THE MATERIAL USED IN ITS CONSTRUCTION CAN BE SPECIALLY DESIGNED AND SELECTED TO REDUCE SHRINKAGE ANISOTROPY.
Description
UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public for inspection and reproduction may be purchased for 30 cents a sheet.
Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Ofiice makes no assertion as to the novelty of the disclosed subject matter.
PUBLISHED APRIL 3, 1973 2"ROLLS PERCENTAGE SHRINK/16E ANISOTROFY iamqm-c-mmo 0 2 4 6 8 iOiZ i416 18202214 PERCENT/16E THMKNESS REDUCTION A green ceramic sheet produced by doctor blade casting of a particulate slip containing, e.g., finely divided alumina, polyvinyl butyral, dibutyl phthalate, a wetting agent and a solvent for the polyvinyl butyral, is characterized by shrinkage anisotropy, i.e., the shrinkage of the sheet measured after firing is less in the casting direction than in the transverse direction. This anisotropy can be substantially eliminated by subjecting the green sheet to an experimentally determined thickness reduction achieved by passing the dried sheets through a series of pressurized rolls which also elongates and densifies the dried sheet. Factors that are significant to the effect of thickness reduction on the elimination of shrinkage anisotropy are temperature, roll diameter, roll pressure, roll speed, and the composition of the casting slip. Also, another application is mentioned wherein the shape of the doctor blade and the material used in its construction can be specially designed and selected to reduce shrinkage anisotropy.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US23756772A | 1972-03-23 | 1972-03-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| UST909004I4 true UST909004I4 (en) | 1973-04-03 |
Family
ID=22894272
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US909004D Pending UST909004I4 (en) | 1972-03-23 | 1972-03-23 | Calendering poctor blade cast ceramic sheets to control anisotropic firing shinkage |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | UST909004I4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6780267B1 (en) * | 1999-09-22 | 2004-08-24 | Matsushita Electric Industrial Co., Ltd. | Electronic device of ceramic |
-
1972
- 1972-03-23 US US909004D patent/UST909004I4/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6780267B1 (en) * | 1999-09-22 | 2004-08-24 | Matsushita Electric Industrial Co., Ltd. | Electronic device of ceramic |
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