DE666698C - Method of sealing high quality ceramic bodies - Google Patents

Method of sealing high quality ceramic bodies

Info

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
Application number
DES127061D
Other languages
German (de)
Inventor
Reinhold Reichmann
Dr Karl Stuckardt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens Schuckertwerke AG
Siemens AG
Original Assignee
Siemens Schuckertwerke AG
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens Schuckertwerke AG, Siemens AG filed Critical Siemens Schuckertwerke AG
Priority to DES127061D priority Critical patent/DE666698C/en
Application granted granted Critical
Publication of DE666698C publication Critical patent/DE666698C/en
Expired legal-status Critical Current

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: "#, Diese Gleichungen besagen, daß sich der Kie-'selsäureester durch Zuführung von Wasserdampf in eine gallertartige Siliciurnverbindung verwandelt, die beim Brennen des keramischen Körpers durch Wasserentziehung in freie Kieselsäure übergeht. Zum Imprägnieren von Körpern mit Kieselsäure sind solche organischen Siliciumverbindungen, die durch Wasseraufnahme in Kieselsäure übergehen; bereits bekannt.The invention relates to a method for sealing such ceramic bodies, in particular protective tubes for temperature-resistant heating elements. The method according to the invention consists in that silica is introduced into the ceramic body from the outside at a predetermined depth, with the result that the ceramic body is completely gas-tight after the final firing. The embodiment of the invention consists, for. B. in that a liquid hydrolyzable silicon compound (z. B. a silicic acid ester) is applied to the not or not fully fired ceramic body, that then the so treated areas moisture (z. B. water vapor) is supplied, which the silicon compound in converts free silica, whereupon the ceramic body is completely fired. The process runs, for example, according to the following chemical equations: "#, These equations state that the silica ester is transformed into a gelatinous silicon compound by the addition of water vapor, which converts into free silica when the ceramic body is fired Water absorption converts to silica; already known.

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)

PATENTANSPRÜCHE: r. Verfahren zum Dichtmachen hochwertiger keramischer Körper, insbesondere der Schutzrohre von Heizkörpern für hohe Temperaturen, dadurch gekennzeichnet; daß in den keramischen Körper vor dem Brennen oder Fertigbrennen von außen her bis zu einer vorausbestimmten Tiefe Kieselsäure eingebracht wird. PATENT CLAIMS: r. Method of sealing high quality ceramic Body, especially the protective tubes of radiators for high temperatures, thereby marked; that in the ceramic body before firing or final firing silica is introduced from the outside to a predetermined depth. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß Kieselsäure in den zu behandelnden keramischen Körper von der einen Seite her eingebracht wird, nachdem dieser von der anderen Seite her bis zu der vorausbestimmten Tiefe mit einem Füllmittel, z. B. Paraffin, getränkt worden ist. 2. The method according to claim i, characterized in that silica in the to treating ceramic body is introduced from one side after this from the other side to the predetermined depth with a filler, z. B. paraffin has been soaked. 3. Verfahren nach Anspruch r oder a, dadurch gekennzeichnet, daß auf den nicht oder nicht fertig gebrannten keramischen Körper eine flüssige Siliciumverbindung (z. B. ein Kieselsäureester) aufgetragen wird, daß dann den so behandelten Stellen Feuchtigkeit (z. B. Wasserdampf) zugeführt wird, worauf nach Umwandlung der Siliciumverbindung in freie Kieselsäure der keramische Körper fertiggebrannt wird. d.. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß die Feuchtigkeit, die dem keramischen Körper nach Auftragen der Siliciumverbindung zugeführt wird, in Säuredämpfen oder Säurelösungen (z. B. 11C1 in Wasser) besteht.3. The method according to claim r or a, characterized characterized in that on the ceramic body not fired or not fully fired a liquid silicon compound (e.g. a silicic acid ester) is applied, that moisture (e.g. water vapor) is then supplied to the areas treated in this way, whereupon, after the silicon compound has been converted into free silicic acid, the ceramic Body is completely burned. d .. The method according to claim 3, characterized in that that the moisture that the ceramic body after application of the silicon compound is supplied, consists in acid vapors or acid solutions (e.g. 11C1 in water).
DES127061D 1937-04-30 1937-04-30 Method of sealing high quality ceramic bodies Expired DE666698C (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (2)

* Cited by examiner, † Cited by third party
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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