DE1054898B - Method for closing the pores of sintered graphite bodies - Google Patents

Method for closing the pores of sintered graphite bodies

Info

Publication number
DE1054898B
DE1054898B DEK35514A DEK0035514A DE1054898B DE 1054898 B DE1054898 B DE 1054898B DE K35514 A DEK35514 A DE K35514A DE K0035514 A DEK0035514 A DE K0035514A DE 1054898 B DE1054898 B DE 1054898B
Authority
DE
Germany
Prior art keywords
silicon
compound
pores
closing
sintered graphite
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
Application number
DEK35514A
Other languages
German (de)
Inventor
Wilhelm Schuster
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.)
Kopp & Kausch
KUEHNLE AG
Original Assignee
Kopp & Kausch
KUEHNLE 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 Kopp & Kausch, KUEHNLE AG filed Critical Kopp & Kausch
Priority to DEK35514A priority Critical patent/DE1054898B/en
Publication of DE1054898B publication Critical patent/DE1054898B/en
Pending 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
    • 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)
  • Sealing Material Composition (AREA)

Description

Verfahren zum Verschließen der Poren von Sinter-Graphit-Körpern Zusatz zum Patent 1013 564 Das Hauptpatent betrifft ein Verfahren zum Verschließen der Poren in Sinter-Graphit-Körpern durch Tränken mit einer Silicium enthaltenden. Flüssigkeit, wobei der trockene Körper mit einer flüssigen hydrolysierbaren Siliciumchloridverbin.dung, insbesondere Siliciumtetrachlorid, getränkt, die Verbindung zu Kieselsäuregel umgesetzt und anschließend in Siliciumdioxyd umgewandelt wird. Dabei ist bereits empfohlen worden, die Behandlung mehrfach zu wiederholen und das Siliciumchlorid an der Oberfläche abdampfen zu lassen. Das Abdampfen an. der Oberfläche dient dazu, die Ausbildung einer Siliciumdioxydhaut zu verhindern. Eine solche Haut würde die elektrischen und mechanischen. Eigenschaften der Oberfläche verändern. Eine mehrfache Wiederholung wurde im Hauptpatent empfohlen, um die Dichtung zu verbessern.Method for closing the pores of sintered graphite bodies Addendum to patent 1013 564 The main patent relates to a method for closing the pores in sintered graphite bodies by impregnation with a silicon-containing one. Liquid, whereby the dry body is soaked with a liquid hydrolyzable silicon chloride compound, in particular silicon tetrachloride, the compound is converted into silica gel and then converted into silicon dioxide. It has already been recommended to repeat the treatment several times and to allow the silicon chloride to evaporate on the surface. The evaporation on. the surface serves to prevent the formation of a silicon dioxide skin. Such a skin would be electrical and mechanical. Change the properties of the surface. A multiple repetition was recommended in the main patent in order to improve the seal.

Versuche haben nun gezeigt, daß unter Beibehaltung des im Hauptpatent angegebenen Prinzips eine bessere Dichtung dann erhalten wird, wenn. die Siliciumverbindung vor der Umwandlung teilweise aus dem Sinter-Graphit-Körper herausgedampft wird. In diesem Falle erstreckt sich je nach dem. Maße des Herausdampfens die Hydrolysierung nur auf eine verhältnismäßig dünne Schicht von z. B. 1/2 bis 1 mm bei einseitiger Einwirkung und von 1 bis 2 mm bei beidseitiger Einwirkung. Eine solche Schicht kann in kurzer Zeit hydrolysiert und. ohne Schädigung durch Temperaturerhöhung in Siliciumdioxyd umgewandelt werden.. Nach dieser Umwandlung wird das Verfahren wiederholt, wobei dann die Siliciumverbin.dung wiederum so weit herausgedampft wird, da.ß der im vorigen Verfahrensschritt mit Siliciumctioxyd gedichtete Kern einen. etwa 1/2 bis 1 mm starken überzug an Siliciumchloridverhindung behält. Diese Schicht wird dann abermals umgesetzt, und das Verfahren wird so, lange wiederholt, bis eine Dichtungszone ausreichender Dicke erhalten ist. Diese Dichtungszone kann die Gesamtdicke des Sinter-Graphit-Körpers ausmachen, doch kann sie auch dünner sein. Eine gegenüber der Gesamtdicke des Sinter-Graphit-Körpers dünnere Dichtungszone wird zweckmäßig sein, wenn, man aus mechanischen Gründen eine besonders weiche Oberfläche haben will oder wenn man die Oberfläche aus elektrischen oder magnetischen Gründen, mit einem anderen Stoff tränken will, der die elektrische oder magnetische Leitfähigkeit oder die mechanischen Eigenschaften in gewünschter Weise beeinflußt.Experiments have now shown that while maintaining the main patent given principle a better seal is obtained when. the silicon compound is partially evaporated from the sintered graphite body prior to conversion. In this case, depending on the. Degree of evaporation the hydrolysis only on a relatively thin layer of z. B. 1/2 to 1 mm for one-sided Action and from 1 to 2 mm with double-sided action. Such a layer can hydrolyzed in a short time and. without damage by increasing the temperature in silicon dioxide be converted .. After this conversion, the process is repeated, whereby then the silicon compound is evaporated out again to such an extent that the previous one Process step with a core sealed with silicon dioxide. about 1/2 to 1 mm thick coating of silicon chloride compound retains. This layer is then implemented again, and the process is repeated until one sealing zone is sufficient Thickness is preserved. This sealing zone can be the total thickness of the sintered graphite body make out, but it can also be thinner. One compared to the total thickness of the sintered graphite body thinner sealing zone will be useful if, for mechanical reasons, one especially soft surface or if you want the surface from electrical or magnetic reasons, wants to soak with another substance that does the electric or magnetic conductivity or mechanical properties in the desired Way influenced.

Claims (3)

PATENTANSPRÜCHE: 1. Verfahren zum Verschließen der Poren in Sinter-Graphit-Körpern durch Tränken mit einer Silicium enthaltenden Flüssigkeit, bei dem der trockene Körper mehrfach mit einer flüssigen hydrolysierbaren Siliciumchlo@ridverbindung, insbesondere Siliciumtetra,chlorid, getränkt, die Verbindung in Kieselsäuregel umgesetzt und anschließend. in Siliciumdioxy d umgewandelt wird, nach Patent 1013 564, dadurch gekennzeichnet, daß die Siliciumchloridverbindung vor der Umsetzung und der Umwandlung teilweise aus dem Körper herausgedampft wird. PATENT CLAIMS: 1. A method for closing the pores in sintered graphite bodies by impregnation with a silicon-containing liquid, in which the dry body is repeatedly impregnated with a liquid hydrolyzable silicon chloride compound, in particular silicon tetra chloride, the compound is converted into silica gel and afterward. is converted into silicon dioxide, according to patent 1013 564, characterized in that the silicon chloride compound is partially evaporated from the body before the reaction and conversion. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Silicium.verbindung in einem Gas erhöhter Temperatur herausgedampft wird. 2. The method according to claim 1, characterized in that the Silicium.verbindungen in a gas of elevated temperature is evaporated out. 3. Verfahren nach. Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Siliciumverbindung in einem Gasstrom herausgedampft wird.3. Procedure according to. Claim 1 or 2, characterized in that that the silicon compound is evaporated in a gas stream.
DEK35514A 1958-08-11 1958-08-11 Method for closing the pores of sintered graphite bodies Pending DE1054898B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEK35514A DE1054898B (en) 1958-08-11 1958-08-11 Method for closing the pores of sintered graphite bodies

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEK35514A DE1054898B (en) 1958-08-11 1958-08-11 Method for closing the pores of sintered graphite bodies

Publications (1)

Publication Number Publication Date
DE1054898B true DE1054898B (en) 1959-04-09

Family

ID=7220375

Family Applications (1)

Application Number Title Priority Date Filing Date
DEK35514A Pending DE1054898B (en) 1958-08-11 1958-08-11 Method for closing the pores of sintered graphite bodies

Country Status (1)

Country Link
DE (1) DE1054898B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6541113B1 (en) 1998-07-24 2003-04-01 Cabot Corporation Methods for preparing silica-coated carbon products

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6541113B1 (en) 1998-07-24 2003-04-01 Cabot Corporation Methods for preparing silica-coated carbon products

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