DE666698C - Method of sealing high quality ceramic bodies - Google Patents
Method of sealing high quality ceramic bodiesInfo
- Publication number
- DE666698C DE666698C DES127061D DES0127061D DE666698C DE 666698 C DE666698 C DE 666698C DE S127061 D DES127061 D DE S127061D DE S0127061 D DES0127061 D DE S0127061D DE 666698 C DE666698 C DE 666698C
- Authority
- DE
- Germany
- Prior art keywords
- ceramic body
- silicon compound
- high quality
- silica
- ceramic bodies
- 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.)
- Expired
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
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
- C04B41/5035—Silica
-
- 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
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5076—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with masses bonded by inorganic cements
- C04B41/5089—Silica sols, alkyl, ammonium or alkali metal silicate cements
-
- 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
- C04B41/85—Coating or impregnation with inorganic materials
-
- 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
- C04B41/85—Coating or impregnation with inorganic materials
- C04B41/87—Ceramics
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
Verfahren zum Dichtmachen hochwertiger keramischer Körper Hochwertige keramische Körper, z. B. die aus Oxyden des Aluminiums, Berylliums, Zirkons hergestellten Schutzrohre für Heizleiter, die gegen hohe Temperaturen widerstandsfähig sein sollen, werden vielfach in völlig gasdichter oder vakuumdichter Ausführung benötigt. Es ist also wichtig, daß die Oberfläche solcher Körper weder porös noch rissig ist. Andererseits dürfen die keramischen Körper keine Reaktionen mit dem Widerstandsmaterial des von ihnen umschlossenen Heizleiters eingehen,; sie müssen daher insbesondere auf ihrer Innenseite möglichst frei von kieselsäurehaltigen Zusätzen sein.Method of sealing high quality ceramic bodies High quality ceramic bodies, e.g. B. those made from oxides of aluminum, beryllium, zirconium Protective tubes for heating conductors that should be resistant to high temperatures, are often required in a completely gas-tight or vacuum-tight design. It it is therefore important that the surface of such bodies is neither porous nor cracked. On the other hand, the ceramic bodies must not react with the resistance material of the heating conductor enclosed by them; they must therefore in particular be as free as possible of silicic acid-containing additives on the inside.
Die Erfindung bezieht sich auf ein Verfahren zum Dichtmachen solcher
keramischen Körper, insbesondere von Schutzrohren für temperaturbeständige Heizkörper.
Das Verfahren gemäß der Erfindung besteht darin, daß in den keramischen Körper von
außen her Kieselsäure in vorausbestimmter Tiefe eingebracht wird, was zur Folge
hat, daß der keramische Körper nach dem Fertigbrennen vollständig gasdicht ist.
Die Ausführung der Erfindung besteht z. B. darin, daß eine flüssige hydrolisierbare
Siliciumverbindung (z. B. ein Kieselsäureester) auf den nicht oder nicht fertig
gebrannten keramischen Körper aufgetragen wird, daß dann den so behandelten Stellen
Feuchtigkeit (z. B. Wasserdampf) zugeführt wird, welche die Siliciumverbindung in
freie Kieselsäure umwandelt, worauf der
keramische Körper fertiggebrannt
wird. Der Vorgang verläuft beispielsweise nach -folgenden chemischen Gleichungen:
Statt freier Kieselsäure können sich u. U. auch Silicate bilden, so kann z. B., wenn die keramische Masse aus Aluminiumoxyd besteht, bei Anwendung hoher Brenntemperaturen reines Aluminiumsilicat gebildet werden, während bei niedrigerer Brenntemperatur ein. Gemisch von Aluminiumsilicat und freier Kieselsäure entsteht.Instead of free silica, silicates may also form, see above can e.g. B. if the ceramic mass consists of aluminum oxide, when using higher Firing temperatures of pure aluminum silicate are formed, while at lower Firing temperature. A mixture of aluminum silicate and free silica is formed.
Um die Tiefe, bis zu welcher die Verdichtung reichen soll, festzulegen, tränkt man den zu behandelnden keramischen Körper zunächst von der anderen Seite her bis zu der vorausbestimmten Tiefe mit einem Füllmittel; z. B. Paraffin; danach kann das Aufbringen der flüssigen Siliciumverbindung durch Aufstreichen oder Eintauchen an den zu behandelnden Stellen vorgenommen werden.To determine the depth to which the compaction should reach, the ceramic body to be treated is first soaked from the other side up to the predetermined depth with a filler; z. B. paraffin; thereafter can be the application of the liquid silicon compound by brushing or dipping be carried out at the areas to be treated.
Das beschriebene Verfahren hat gegenüber den bekannten Verfahren, gemäß welchen dein keramischen Körper eine Glasur aus Feldspat o. dgl. erteilt wird, vor allem den Vorteil, daß der Schmelzpunkt des keramischen Körpers nicht erheblich herabgesetzt wird. Statt die Umwandlung der flüssigen Siliciumverbindung durch Wasserdampf vorzunehmen, können auch andere bekannte feuchte :Mittel, z. B. Säuredämpfe öder Säurelösungen ' (HCl in Wasser) oder auch Alkalien, beispielsweise Ammoniak in wäßriger Lösung, verwendet werden.The method described has, compared to the known methods, according to which your ceramic body is given a glaze made of feldspar or the like, above all the advantage that the melting point of the ceramic body is not significant is reduced. Instead of converting the liquid silicon compound through water vapor make, other known moist: agents, z. B. Acid vapors orer Acid solutions' (HCl in water) or alkalis, for example ammonia in aqueous Solution, can be used.
Claims (3)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES127061D DE666698C (en) | 1937-04-30 | 1937-04-30 | Method of sealing high quality ceramic bodies |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DES127061D DE666698C (en) | 1937-04-30 | 1937-04-30 | Method of sealing high quality ceramic bodies |
Publications (1)
Publication Number | Publication Date |
---|---|
DE666698C true DE666698C (en) | 1938-10-26 |
Family
ID=7537359
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DES127061D Expired DE666698C (en) | 1937-04-30 | 1937-04-30 | Method of sealing high quality ceramic bodies |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE666698C (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE950833C (en) * | 1952-10-01 | 1956-10-18 | Hoechst Ag | Process for the production of impregnated graphite and carbon molded bodies |
WO1988002742A1 (en) * | 1986-10-17 | 1988-04-21 | Washington Research Foundation | Method for producing a surface-toughened ceramic composite |
-
1937
- 1937-04-30 DE DES127061D patent/DE666698C/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE950833C (en) * | 1952-10-01 | 1956-10-18 | Hoechst Ag | Process for the production of impregnated graphite and carbon molded bodies |
WO1988002742A1 (en) * | 1986-10-17 | 1988-04-21 | Washington Research Foundation | Method for producing a surface-toughened ceramic composite |
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