DE19963069A1 - Protective coating for a workpiece consists of a glassy or ceramic oxidic material applied using a sol-gel method - Google Patents
Protective coating for a workpiece consists of a glassy or ceramic oxidic material applied using a sol-gel methodInfo
- Publication number
- DE19963069A1 DE19963069A1 DE1999163069 DE19963069A DE19963069A1 DE 19963069 A1 DE19963069 A1 DE 19963069A1 DE 1999163069 DE1999163069 DE 1999163069 DE 19963069 A DE19963069 A DE 19963069A DE 19963069 A1 DE19963069 A1 DE 19963069A1
- Authority
- DE
- Germany
- Prior art keywords
- protective coating
- sol
- coating according
- workpiece
- protective
- 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.)
- Withdrawn
Links
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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/4505—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application
- C04B41/4535—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application applied as a solution, emulsion, dispersion or suspension
- C04B41/4537—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements characterised by the method of application applied as a solution, emulsion, dispersion or suspension by the sol-gel process
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/52—Multiple coating or impregnating multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
- C04B41/81—Coating or impregnation
- C04B41/89—Coating or impregnation for obtaining at least two superposed coatings having different compositions
Abstract
Description
Die vorliegende Erfindung betrifft einen Schutzüberzug oder eine Schutzbeschichtung für Werkstücke aus einem Kohlenstoff-Verbundwerkstoff. Schutzüberzüge zur Verbesserung der Oxidationsbeständigkeit von kohlenstoffhaltigen Werkstoffen sind bereits Stand der Technik, wie anhand der folgenden Beispiele erläutert werden soll.The present invention relates to a protective cover or Protective coating for workpieces made of a carbon composite. Protective coatings to improve the oxidation resistance of Carbonaceous materials are already state of the art, as shown in the following examples should be explained.
In der DE 196 16 217 wird eine Schutzschicht beschrieben, die aus refraktären keramischen Pulverteilchen mit hohem Emissionsvermögen für Wärmestrahlung und glasig amorphen Phasen bestehen. Die Zusammensetzung der Feststoffteilchenmischung besteht beispielsweise zu 75-86 Gewichtsteilen MoSi2, 6,5-10 Gewichtsteilen B4C, 7-12 Gewichtsteilen SiB4 und 2-6 Gewichtsteilen YB6. Der US 4535035 kann eine Oxidationsschutzschicht auf der Basis von Nickel- und Siliziumpulver entnommen werden. Ein Schlicker aus dieser Pulvermischung wird aufgesprüht und anschließend im Temperaturbereich zwischen 1200°C und 1400°C versintert.DE 196 16 217 describes a protective layer which consists of refractory ceramic powder particles with high emissivity for heat radiation and glassy amorphous phases. The composition of the solid particle mixture consists, for example, of 75-86 parts by weight of MoSi 2 , 6.5-10 parts by weight of B 4 C, 7-12 parts by weight of SiB 4 and 2-6 parts by weight of YB 6 . US 4535035 shows an oxidation protection layer based on nickel and silicon powder. A slip of this powder mixture is sprayed on and then sintered in the temperature range between 1200 ° C and 1400 ° C.
Ein mehrschichtiger Schutzüberzug für kohlenstoffhaltige Materialien wird in der US 4471023 beschrieben. Dieser Schutzüberzug wird auf SiC beschichteten kohlenstoffhaltigen Werkstücken aufgebracht. Zunächst wird eine Schicht aus Tetraethylorthosilikat (TEOS) infiltriert. Anschließend werden Schutzschichten aus Alkalisilikaten mit und ohne SiC-Partikel aufgebracht und abschließend bei etwa 1000°C wärmebehandelt.A multi-layer protective coating for carbonaceous materials is used in the US 4471023. This protective coating is coated on SiC carbon-containing workpieces applied. First, a layer is made Tetraethylorthosilicate (TEOS) infiltrated. Then there are protective layers made of alkali silicates with and without SiC particles and finally at heat-treated at around 1000 ° C.
Ausgehend von den bekannten Schutzschichten auf Kohlenstoff- Verbundwerkstoffen hat die vorliegende Erfindung zum Ziel, die Beständigkeit der genannten Werkstoffe gegen Hochtemperaturangriffe von Gasen, insbesondere der Hochtemperaturoxidation, unter Verwendung einer einfach aufzubringenden Schutzbeschichtung zu verbessern. Weiterhin hat die vorliegende Erfindung das Ziel, die Diffusion von Elementen, die in dem Kohlenstoff-Verbundwerkstoff enthalten sind, beispielsweise Silizium, in Werkstücke, die in Kontakt mit dem Kohlenstoff-Verbundwerkstoff stehen, zu verhindern.Based on the known protective layers on carbon Composites have the aim of the present invention, the durability of the materials mentioned against high-temperature attacks by gases, especially high temperature oxidation, using a simple to improve the protective coating to be applied. Furthermore, the The present invention aims to diffuse elements contained in the Carbon composite are included, such as silicon, in Workpieces that are in contact with the carbon composite material prevent.
Die erfindungsgemäße Schutzbeschichtung für ein Werkstück aus einem Kohlenstoff-Verbundwerkstoff mit wenigstens einer Schutzschicht ist dadurch gekennzeichnet, dass sie aus einem glasartigen oder keramischen, oxidischen Werkstoff besteht und über ein nasschemisches Verfahren auf der Basis einer Polymer- oder Kolloiddispersion (Sol-Gel Verfahren) aufgebracht und anschließend einer Wärmebehandlung unterzogen wird. The protective coating according to the invention for a workpiece from a This makes carbon composite material with at least one protective layer characterized that they are made of a glass-like or ceramic, oxidic Material and a wet chemical process based on a Polymer or colloidal dispersion (sol-gel method) applied and is then subjected to a heat treatment.
Im Unterschied zu den Lösungen des Standes der Technik zeichnet sich die erfindungsgemäße Lösung insbesondere dadurch aus, dass mit dem beschriebenen Verfahren eine sehr homogene, dichte Beschichtung aufgebracht wird, die aufgrund ihrer geringen Dicke weniger riss- und abplatzgefährdet ist, als Schutzschichten, die dem Stand der Technik entsprechen.In contrast to the solutions of the prior art, the solution according to the invention in particular that with described method applied a very homogeneous, dense coating which, due to its small thickness, is less prone to cracking and chipping than Protective layers that correspond to the state of the art.
Die vor der abschließenden Wärmebehandlung noch vorhandene Porosität mit Porengrößen im Nanometerbereich ermöglicht ein vollständiges Dichtsintern der Schicht, die damit den Zutritt von Sauerstoff oder anderen aggressiven Gasen verhindert und eine wirksame Diffusionssperre für andere Elemente darstellt. Zusätzlich zu den über Sol-Gel Verfahren aufgebrachten Schichten können eine oder mehrere weitere Schichten, die über andere Verfahren, beispielsweise CVD-Verfahren, hergestellt werden, die beschriebene Schutzwirkung noch erhöhen.The porosity still present before the final heat treatment Pore sizes in the nanometer range enable complete sealing sintering Layer that allows the entry of oxygen or other aggressive gases prevented and represents an effective diffusion barrier for other elements. In addition to the layers applied via sol-gel processes, one can or several other layers, which use other methods, for example CVD processes are produced, the protective effect described increase.
Durch dieses Kombinationsverfahren kann eine höhere Gesamtschichtdicke erreicht werden und die Beschichtung stellt damit auch einen Schutz gegen mechanische Beanspruchungen dar.This combination process enables a higher total layer thickness can be achieved and the coating thus also provides protection against mechanical stresses.
Durch die einfache Verfahrensweise ist es möglich, Werkstücke nach einer gewissen Gebrauchsdauer erneut zu beschichten und damit die Lebensdauer des Werkstücks zu verlängern.The simple procedure makes it possible to workpieces according to a to coat again after a certain period of use and thus the service life to extend the workpiece.
Eine Polymerdispersion auf der Basis von Aluminiumalkoholaten in iso-Propanol
wurde wie folgt hergestellt:
1 Mol-Anteil Aluminium-tri-sekbutylat (ATSB)
0,5-6 Mol-Anteile destilliertes Wasser
0,3-3 Mol-Anteile Acetylaceton (AcAc)
2,5-20 Mol-Anteile iso-Propanol (iP)A polymer dispersion based on aluminum alcoholates in isopropanol was prepared as follows:
1 mole fraction of aluminum trisecbutylate (ATSB)
0.5-6 mole parts of distilled water
0.3-3 mole percent acetylacetone (AcAc)
2.5-20 molar proportions of isopropanol (iP)
ATSB wurde in iP gelöst und anschließend AcAc hinzugegeben. Diese Lösung wurde ca. 30 min bei Raumtemperatur gerührt. Anschließend wurde das destillierte Wasser zugegeben und ebenfalls ca. 30 min gerührt. Der angefallene Niederschlag wurde durch Zugabe von konzentrierter Salpetersäure gelöst, so dass ein klares Sol entstand. Dieses Sol wurde üblicherweise durch ein Tauchbeschichtungsverfahren auf das Substrat aufgetragen und nach einer kurzen Trocknung bei 500°C 20 min lang an Luft wärmebehandelt. Anschließend wurde dieser Beschichtungsprozess noch 1-3 mal wiederholt. Abschließend wurden die beschichteten Werkstücke unter Vakuum bei mindestens 1100°C 3 h lang behandelt. Bei Anwendungen, die bei einer höheren Temperatur erfolgten, wurden die Proben bei dieser Temperatur mindestens 3 h lang gehalten. Auf diese Art und Weise wurde eine dichte, feinstkristalline Al2O3 Schicht erhalten.ATSB was solved in iP and then AcAc added. This solution was stirred for about 30 minutes at room temperature. The distilled water was then added and the mixture was also stirred for about 30 minutes. The precipitate was dissolved by adding concentrated nitric acid, so that a clear sol was formed. This sol was usually applied to the substrate by a dip coating process and after a short drying at 500 ° C. for 20 minutes in air. This coating process was then repeated 1-3 times. Finally, the coated workpieces were treated under vacuum at at least 1100 ° C. for 3 hours. In higher temperature applications, the samples were held at that temperature for at least 3 hours. In this way, a dense, very fine crystalline Al 2 O 3 layer was obtained.
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999163069 DE19963069A1 (en) | 1999-12-24 | 1999-12-24 | Protective coating for a workpiece consists of a glassy or ceramic oxidic material applied using a sol-gel method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE1999163069 DE19963069A1 (en) | 1999-12-24 | 1999-12-24 | Protective coating for a workpiece consists of a glassy or ceramic oxidic material applied using a sol-gel method |
Publications (1)
Publication Number | Publication Date |
---|---|
DE19963069A1 true DE19963069A1 (en) | 2001-06-28 |
Family
ID=7934542
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE1999163069 Withdrawn DE19963069A1 (en) | 1999-12-24 | 1999-12-24 | Protective coating for a workpiece consists of a glassy or ceramic oxidic material applied using a sol-gel method |
Country Status (1)
Country | Link |
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DE (1) | DE19963069A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006067184A1 (en) * | 2004-12-23 | 2006-06-29 | Messier-Bugatti | A method of making a fiber preform for manufacturing parts of a composite material of the carbon/carbon type incorporating ceramic particles, and products obtained thereby |
DE102008019785A1 (en) * | 2008-04-18 | 2009-10-22 | Itn Nanovation Ag | Production of a corrosions-stable gas-tight coating used as an anti-adhesion coating comprises applying a primer layer with corrosion protection properties and a covering layer with high temperature anti-adhesion properties on a substrate |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0223205A1 (en) * | 1985-11-13 | 1987-05-27 | Union Carbide Corporation | Oxidation retarded graphite or carbon electrode and method for producing the electrode |
DD296478A5 (en) * | 1990-07-06 | 1991-12-05 | Elektrokohle Lichtenberg Ag,De | PROCESS FOR PREPARING OXYDATION PROTECTION ON CERAMIC FORMKOERPES |
EP0134769B1 (en) * | 1983-07-28 | 1992-11-19 | Union Carbide Corporation | Oxidation prohibitive coatings for carbonaceous articles |
US5208099A (en) * | 1991-09-06 | 1993-05-04 | Daimler-Benz | Oxidation protection process for porous carbon bodies |
DE69128080T2 (en) * | 1990-05-18 | 1998-02-26 | Hitco Technologies Inc | MATERIALS FOR CDV PROCESSES |
DE19634855A1 (en) * | 1996-08-28 | 1998-03-19 | Haldenwanger Tech Keramik Gmbh | Process for the production of an oxidation protection for porous ceramics based on SiC and Si¶3¶N¶4¶ |
DE19647368A1 (en) * | 1996-11-15 | 1998-05-20 | Inst Neue Mat Gemein Gmbh | Composites |
US5756160A (en) * | 1988-03-28 | 1998-05-26 | Hughes Aircraft | Surface protection for carbon composite materials |
DE19614676C2 (en) * | 1996-04-13 | 1998-09-03 | Choe Kum Chol | Process for refining SiC heating rods |
-
1999
- 1999-12-24 DE DE1999163069 patent/DE19963069A1/en not_active Withdrawn
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0134769B1 (en) * | 1983-07-28 | 1992-11-19 | Union Carbide Corporation | Oxidation prohibitive coatings for carbonaceous articles |
EP0223205A1 (en) * | 1985-11-13 | 1987-05-27 | Union Carbide Corporation | Oxidation retarded graphite or carbon electrode and method for producing the electrode |
US5756160A (en) * | 1988-03-28 | 1998-05-26 | Hughes Aircraft | Surface protection for carbon composite materials |
DE69128080T2 (en) * | 1990-05-18 | 1998-02-26 | Hitco Technologies Inc | MATERIALS FOR CDV PROCESSES |
DD296478A5 (en) * | 1990-07-06 | 1991-12-05 | Elektrokohle Lichtenberg Ag,De | PROCESS FOR PREPARING OXYDATION PROTECTION ON CERAMIC FORMKOERPES |
US5208099A (en) * | 1991-09-06 | 1993-05-04 | Daimler-Benz | Oxidation protection process for porous carbon bodies |
DE19614676C2 (en) * | 1996-04-13 | 1998-09-03 | Choe Kum Chol | Process for refining SiC heating rods |
DE19634855A1 (en) * | 1996-08-28 | 1998-03-19 | Haldenwanger Tech Keramik Gmbh | Process for the production of an oxidation protection for porous ceramics based on SiC and Si¶3¶N¶4¶ |
DE19647368A1 (en) * | 1996-11-15 | 1998-05-20 | Inst Neue Mat Gemein Gmbh | Composites |
Non-Patent Citations (1)
Title |
---|
JP 09278567 A.,In: Patent Abstracts of Japan * |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006067184A1 (en) * | 2004-12-23 | 2006-06-29 | Messier-Bugatti | A method of making a fiber preform for manufacturing parts of a composite material of the carbon/carbon type incorporating ceramic particles, and products obtained thereby |
FR2880016A1 (en) * | 2004-12-23 | 2006-06-30 | Messier Bugatti Sa | PROCESS FOR PRODUCING A FIBROUS PREFORM FOR THE MANUFACTURE OF CARBON / CARBON COMPOSITE MATERIAL PARTS INCORPORATING CERAMIC PARTICLES, AND PRODUCT PRODUCED THEREBY |
US8282756B2 (en) | 2004-12-23 | 2012-10-09 | Messier-Bugatti | Method of making a fiber preform for manufacturing parts of a composite material of the carbon/carbon type incorporating ceramic particles, and products obtained thereby |
DE102008019785A1 (en) * | 2008-04-18 | 2009-10-22 | Itn Nanovation Ag | Production of a corrosions-stable gas-tight coating used as an anti-adhesion coating comprises applying a primer layer with corrosion protection properties and a covering layer with high temperature anti-adhesion properties on a substrate |
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Legal Events
Date | Code | Title | Description |
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OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
8141 | Disposal/no request for examination |