DE854323C - Surface finishing of ceramic products, in particular made of sintered clay - Google Patents

Surface finishing of ceramic products, in particular made of sintered clay

Info

Publication number
DE854323C
DE854323C DES5706D DES0005706D DE854323C DE 854323 C DE854323 C DE 854323C DE S5706 D DES5706 D DE S5706D DE S0005706 D DES0005706 D DE S0005706D DE 854323 C DE854323 C DE 854323C
Authority
DE
Germany
Prior art keywords
molding
slip
engobing
ceramic products
surface finishing
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
DES5706D
Other languages
German (de)
Inventor
Hubert Dr Phil Wagner
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 AG
Original Assignee
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 AG filed Critical Siemens AG
Priority to DES5706D priority Critical patent/DE854323C/en
Application granted granted Critical
Publication of DE854323C publication Critical patent/DE854323C/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
    • C04B41/5022—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 vitreous 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
    • C04B41/86—Glazes; Cold glazes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Spark Plugs (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Description

Oberflächenveredelung von keramischen Erzeugnissen, insbesondere aus gesinterter Tonerde Zur Herstellung von keramischen Erzeugnissen, z. B. aus gesinterter Tonerde, kann das sogenannte Gießverfahren oder das Preßverfahren dienen. Bei beiden Verfahren wird im allgemeinen zunächst ein Rohling gewonnen, der mechanisch bearbeitet wird, um einen Formling von der Gestalt des fertigen Erzeugnisses zu ergeben. Infolge der mechanischen Bearbeitung wird die beim Pressen erzeugte glatte Preßhaut zerstört und der Formling mit einer verhältnismäßig rauhen Oberfläche erhalten, die sich auch nach dem Brand wesentlich rauher erweist als die Oberfläche von Stellen, deren Preßhaut nicht zerstört worden ist. Es ist nun in vielen Fällen erwünscht, eine glatte Oberfläche zu erhalten, z. B. an den in den Verbrennungsraum hineinragenden Teilen von Zündkerzenisolatoren. Gemäß der Erfindung wird vorgeschlagen, die mechanisch bearbeiteten Rohkörper (Gießlinge oder Preßlinge) mittels eines Schlickers aus Stoffen, aus denen der Rohkörper besteht, zu engobieren. Eine solche Engobe kann in Schichtdicken von zehntel Millimetern aufgetragen werden und ergibt nach dem Brand glatte Flächen von seidigem Glanz.Surface finishing of ceramic products, in particular of sintered alumina For the manufacture of ceramic products, e.g. B. from sintered Alumina, the so-called casting process or the pressing process can be used. By both In the process, a blank is generally first obtained, which is then mechanically processed to give a molding of the shape of the finished product. As a result mechanical processing destroys the smooth pressed skin produced during pressing and the molding obtained with a relatively rough surface, which even after the fire turns out to be much rougher than the surface of places whose Press skin has not been destroyed. In many cases it is now desirable to have a to obtain a smooth surface, e.g. B. to the protruding into the combustion chamber Parts of spark plug insulators. According to the invention it is proposed that mechanically machined raw bodies (castings or compacts) by means of a slip made of materials, from which the raw body consists of engobing. Such an engobe can be made in layers of tenths of a millimeter can be applied and results in smooth surfaces after firing of a silky sheen.

Beim Engobieren sind folgende Umstände zu beachten: Der bearbeitete Rohkörper muß sich von dem Schlicker-benetzen lassen. Gegebenenfalls werden die Formlinge durch Eintauchen in Wasser oder eine öllösende Flüssigkeit, beispielsweise mit Wasser verdünntem Alkohol, benetzbar gemacht. Des weiteren müssen die Feuchtigkeit `des Rohkörpers und die Konsistenz des Schlickers so abgestimmt sein, daß die Engobe in der gewünschten Dicke aufliegt. Zweckmäßigerweise wird die Engobe durch Tauchen des feuchten Formlings in den Gießschlicker hergestellt, wobei die Tauchzeit mitbestimmend für die Dicke der Engobeschicht ist.When engobing the following circumstances must be observed: The processed Raw body must be from let the slip wet. Possibly the briquettes are immersed in water or an oil-dissolving liquid, for example with alcohol diluted with water, made wettable. Furthermore must the moisture of the raw body and the consistency of the slip are matched ensure that the engobe rests in the desired thickness. Appropriately, the Engobe produced by dipping the moist molding into the casting slip, whereby the immersion time is one of the determining factors for the thickness of the engobe layer.

Das Verfahren gemäß der Erfindung setzt voraus, daß die Masse des zu engobierenden Formlings und die Masse des Schlickers annähernd gleiche Brennschwindung aufweisen. Beispielsweise wird eine aus gesinterterTonerde aufbereitetePreßmasse mit einer Brennschwindung des Preßlings von 20% zu Rohkörpern verpreßt, mechanisch bearbeitet und die gewünschten Stellen in einen Gießschlicker getaucht, der Gießlinge mit einer Brennschwindung von 200/0 ergibt. -Die Oberfläche fällt dann besonders gut aus, wenn ein von Lufteinflüssen befreiter Schlicker verwendet wird. Zu diesem Zwecke wird der Schlicker unter Unterdruck gesetzt, so daß die Gaseinschlüsse entweichen. Die mit einem solchen Schlicker erzielte Engobe sitzt blasenfrei auf dem Formling.The method according to the invention assumes that the mass of The molding to be engobed and the mass of the slip are approximately the same as the firing shrinkage exhibit. For example, a molding compound prepared from sintered clay is used pressed with a firing shrinkage of the compact of 20% to form blanks, mechanically processed and dipped the desired places in a casting slip, the castings with a firing shrinkage of 200/0. -The surface then falls particularly works well if a slip that has been freed from the effects of air is used. To this For this purpose, the slip is placed under negative pressure so that the gas inclusions escape. The engobe obtained with such a slip sits bubble-free on the molding.

Die auf diese Weise erhaltene Oberfläche zeichnet sich nicht nur durch Glattheft aus und ist dementsprechend unempfindlicher gegen Anlagerung von Ruß, 01 und anderen Fremdstoffen, sondern wirkt sich auch in einer Erhöhung der elektrischen Durchschlagsfestigkeit aus, die besonders bei dünnwandigen Gegenständen bedeutend sein kann.The surface obtained in this way is not only characterized by Smooth handle and is accordingly less sensitive to the accumulation of soot, 01 and other foreign substances, but also affects an increase in electrical Dielectric strength, which is particularly important for thin-walled objects can be.

Claims (5)

PATENTANSPRÜCHE: i. Verfahren zur Oberflächenveredelung von keramischen Erzeugnissen, insbesondere aus gesinterter Tonerde, dadurch gekennzeichnet, daß der durch Pressen oder Gießen und nachfolgende mechanische Bearbeitung hergestellte Formling mit einem Schlicker aus Stoffen, aus denen der Formling besteht, engobiert und anschließend gebrannt wird. PATENT CLAIMS: i. Process for surface finishing of ceramic Products, in particular made of sintered clay, characterized in that that produced by pressing or casting and subsequent mechanical processing The molding is engobed with a slip of substances that make up the molding and then burned. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß das Engobieren durch Tauchen des Formlings in den Schlicker erfolgt. 2. The method according to claim i, characterized in that that engobing takes place by dipping the molding into the slip. 3. Verfahren nach Anspruch i und 2, dadurch gekennzeichnet, daß der Formling vor dem Engobieren durch Tauchen in eine gegebenenfalls fettlösende Flüssigkeit benetzbar gemacht wird. 3. Procedure according to claims 1 and 2, characterized in that the molding is made before engobing is made wettable by immersion in an optionally fat-dissolving liquid. 4. Verfahren nach Anspruch 2, dadurch gekennzeichnet; daß die Feuchtigkeit des Formlings, die Konsistenz des Schlickers und die Tauchdauer beim Engobieren so aufeinander abgestimmt werden, daß eine Engobeschicht der gewünschten Dicke erhalten wird. 4. The method according to claim 2, characterized in; that the moisture of the molding, the consistency of the slip and the duration of immersion when engobing are so closely related be coordinated so that an engobe layer of the desired thickness is obtained. 5. Verfahren nach Anspruch i bis 4, dadurch gekennzeichnet, däß der zur Engobierung verwendete=S'chLicker entgast wird.5. Method according to claims 1 to 4, characterized in that the engobing used = S'chLicker is degassed.
DES5706D 1944-10-07 1944-10-07 Surface finishing of ceramic products, in particular made of sintered clay Expired DE854323C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DES5706D DE854323C (en) 1944-10-07 1944-10-07 Surface finishing of ceramic products, in particular made of sintered clay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DES5706D DE854323C (en) 1944-10-07 1944-10-07 Surface finishing of ceramic products, in particular made of sintered clay

Publications (1)

Publication Number Publication Date
DE854323C true DE854323C (en) 1952-11-04

Family

ID=7471545

Family Applications (1)

Application Number Title Priority Date Filing Date
DES5706D Expired DE854323C (en) 1944-10-07 1944-10-07 Surface finishing of ceramic products, in particular made of sintered clay

Country Status (1)

Country Link
DE (1) DE854323C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004106266A1 (en) * 2003-05-29 2004-12-09 Andrzej Oleksiewicz A method of manufacturing coated ceramic products

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004106266A1 (en) * 2003-05-29 2004-12-09 Andrzej Oleksiewicz A method of manufacturing coated ceramic products

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