EP0523670A1 - Process for making a full ceramic element and element manufactured by the process - Google Patents

Process for making a full ceramic element and element manufactured by the process Download PDF

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Publication number
EP0523670A1
EP0523670A1 EP92112098A EP92112098A EP0523670A1 EP 0523670 A1 EP0523670 A1 EP 0523670A1 EP 92112098 A EP92112098 A EP 92112098A EP 92112098 A EP92112098 A EP 92112098A EP 0523670 A1 EP0523670 A1 EP 0523670A1
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EP
European Patent Office
Prior art keywords
component
inner part
slip
casting mold
conical
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EP92112098A
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German (de)
French (fr)
Inventor
Jürgen Dr. Heinrich
Reinhard Dr. Dillinger
Matthias Steiner
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Ceramtec GmbH
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Ceramtec GmbH
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Priority claimed from DE4123794A external-priority patent/DE4123794C1/de
Priority claimed from DE4203639A external-priority patent/DE4203639A1/en
Application filed by Ceramtec GmbH filed Critical Ceramtec GmbH
Publication of EP0523670A1 publication Critical patent/EP0523670A1/en
Withdrawn legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
    • B28B11/08—Apparatus or processes for treating or working the shaped or preshaped articles for reshaping the surface, e.g. smoothing, roughening, corrugating, making screw-threads
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
    • F01L3/02—Selecting particular materials for valve-members or valve-seats; Valve-members or valve-seats composed of two or more materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F7/00—Casings, e.g. crankcases or frames
    • F02F7/0085—Materials for constructing engines or their parts
    • F02F7/0087—Ceramic materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L2301/00—Using particular materials
    • F01L2301/02—Using ceramic materials

Definitions

  • the invention relates to methods for producing solid ceramic components that at least partially have a cylindrical outer surface.
  • the object of the invention was therefore to provide an improved slip casting process for the production of cylindrical or partially cylindrical components made of ceramic material, in which the risk of cavities no longer exists in the finished component.
  • the casting mold with the conical inner part is completely filled with pourable slip according to the method according to the invention together with the slip reservoir connected to it.
  • pourable slip By diffusing the liquid phase of the slip into the absorbent, porous wall of the casting mold, solid particles are transported to the wall of the casting mold and accumulate there to form a green component.
  • the component grows radially in the direction of the axis of symmetry of the rotationally symmetrical casting mold due to ever increasing solid deposition. If the thickness of the mass layer deposited on the wall of the casting mold is designated by x, then for the growth of the component from a certain thickness of the mass layer, the water transport through the component is the speed-determining step.
  • the outer wall of the component obtained is an image of the inner wall of the mold.
  • the conical design of the inner part of the casting mold enables a continuous material transport of the slip from the slip storage container into the conical inner part. This is because the taper prevents solid deposits from forming at undesired locations within the casting mold, which hinder or usually even completely prevent the further transport of the slip mass into the interior of the casting mold.
  • the necessary taper of the shape depends on the one hand on the length / diameter ratio of the component to be manufactured, and on the other hand on the quality of the slip. The greater this ratio and the greater the component formation rate A of the slip used, the greater the required taper.
  • the conical component obtained must at least partially be converted into a cylinder by mechanical processing (removal) in a subsequent production step.
  • the component is mechanically processed immediately after drying and then fired.
  • the dried ceramic component is first fired and then the mechanical processing is carried out.
  • the processing (e.g. grinding, lapping or polishing) of the fired components is particularly expedient in the case of ceramic engine components which are subject to high mechanical and thermal loads, such as, for example, valves or solid piston pins.
  • the one that can be achieved by firing Surface quality is not fully sufficient, so that a subsequent surface treatment is required. Even if additional functional surfaces such as sliding and sealing surfaces are provided on the component, subsequent finishing of the corresponding components is necessary.
  • Figure 1 shows a vertical section through a casting mold with a cylindrical inner part in a side view.
  • Figure 2 shows a vertical section through a casting mold with a conical inner part in a side view.
  • the embodiment according to FIG. 1 is the one used according to the prior art.
  • the slip reservoir 1, which is directly upstream of the cylindrical inner part 3, is highlighted in detail with reference numerals.
  • the casting mold 4 itself consists of absorbent, porous material, usually plaster.
  • the same reference numbers have the same meaning. But it is clearly recognizable that the inner part 3 of the casting mold 4 has a shape which opens conically upwards. As a result, the pouring point 2 is widened and undesirable solid deposits can no longer occur.
  • the method according to the invention is particularly suitable for the production of ceramic components made of silicon nitride. It is possible to use slip casting compounds either based on silicon nitride or silicon. When sintering in a nitrogen atmosphere, the silicon converts to silicon nitride.
  • the process according to the invention can be used to produce (cylindrical) full piston pins or valve stems (with cylindrical sections). Using the measurement method of coarse X-ray structure analysis, it can be shown that cavities in the area of the axis of symmetry of the cylinder cannot be detected within the scope of the measurement accuracy in the case of components produced by the method according to the invention.

Abstract

A process for manufacturing a solid ceramic element is described having at least partly a cylindrical circumferential surface. In this process, a castable ceramic slip is introduced into an absorbent casting mould with an inner part tapered conically downwards. The casting mould is directly connected to a slip reserve container. Then the green solid element with a conical surface produced in the conical inner part of the casting mould is removed from the inner part and in a subsequent production operation the conical surface of the element is transformed at least partly into a cylindrical circumferential surface by machining. The invention also relates to a solid element manufactured according to the process and the use thereof. <IMAGE>

Description

Die Erfindung betrifft Verfahren zur Herstellung massiver keramischer Bauteile, die mindestens teilweise eine zylindrische Mantelfläche aufweisen.The invention relates to methods for producing solid ceramic components that at least partially have a cylindrical outer surface.

Beim Schlickergießen zylindrischer oder teilweise zylindrischer keramischer Vollgußteile, insbesondere solcher Vollgußteile mit einem großen Verhältnis von Höhe/Durchmesser, stellt sich das Problem des Einschlusses von Luftblasen in dem grünen Bauteil, die zu sogenannten Lunkern, das sind Hohläume von rein zufälliger Formgebung im Innern des keramischen Bauteils, führen. Diese Lunker entstehen insbesondere im Bereich der Symmetrieachse, d.h. im Zentrum der Zylinder oder der zylindrischen Teilbereiche der Bauteile, und sind äußerst unerwünscht, weil sie außerordentlich negative Auswirkungen auf die physikalischen Eigenschaften der fertigen Bauteile besitzen.When slip casting cylindrical or partially cylindrical ceramic solid castings, in particular such solid castings with a large ratio of height / diameter, the problem arises of the inclusion of air bubbles in the green component, which result in so-called cavities, which are cavities of a purely random shape inside the ceramic Component. These cavities arise especially in the area of the axis of symmetry, i.e. in the center of the cylinder or the cylindrical partial areas of the components, and are extremely undesirable because they have extremely negative effects on the physical properties of the finished components.

Aufgabe der Erfindung war es deshalb, ein verbessertes Schlickergießverfahren für die Herstellung von zylindrischen oder teilweise zylindrischen Bauteilen aus Keramikmaterial anzugeben, bei dem die Gefahr der Ausbildung von Lunkern in dem fertigen Bauteil nicht mehr besteht.The object of the invention was therefore to provide an improved slip casting process for the production of cylindrical or partially cylindrical components made of ceramic material, in which the risk of cavities no longer exists in the finished component.

Gelöst wird diese Aufgabe durch ein Verfahren der eingangs genannten Gattung, dessen Kennzeichenmerkmale darin zu sehen sind, daß ein gießfähiger keramischer Schlicker in eine saugfähige Gießform mit nach unten konisch verjüngtem Innenteil, die an einen Schlickervorratsbehälter angeschlossen ist, eingebracht wird, daß das in dem konischen Innenteil der Gießform entstandene grüne massive Bauteil mit konischer Oberfläche dem Innenteil entnommen wird und daß in einem nachgeschalteten Fertigungsschritt die konische Oberfläche des Bauteils mindestens teilweise durch mechanische Bearbeitung in eine zylindrische Mantelfläche überführt wird.This object is achieved by a method of the type mentioned at the outset, the characteristic features of which can be seen in the fact that a pourable ceramic slip is introduced into an absorbent casting mold with an internally tapered inner part which is connected to a slip reservoir, that in the conical The green solid component with a conical surface that has arisen from the inner part of the casting mold is removed from the inner part and that in a subsequent production step the conical surface of the component is at least partially machined into a cylindrical surface Lateral surface is transferred.

Die Gießform mit dem konischen Innenteil wird nach dem erfindungsgemäßen Verfahren zusammen mit dem daran angeschlossenen Schlickervorratsbehälter vollständig mit gießfähigem Schlicker gefüllt. Durch Diffusion der flüssigen Phase des Schlickers in die saugfähige, poröse Wandung der Gießform werden Feststoffpartikel zu der Wandung der Gießform hin transportiert und lagern sich dort zu einem grünen Bauteil an. Das Bauteil wächst, ausgehend von der Wandung der Gießform, durch immer weiter zunehmende Feststoffanlagerung radial in Richtung der Symmetrieachse der rotationssymmetrischen Gießform. Wird die Dicke der auf der Wandung der Gießform abgesetzten Masseschicht mit x bezeichnet, so ist für das Wachstum des Bauteils ab einer gewissen Dicke der Masseschicht der Wassertransport durch das Bauteil der geschwindigkeitsbestimmende Schritt. Diese Zusammenhänge lassen sich auch rechnerisch darstellen, denn es gilt dx/dt ∼ ¹/x und nach Intergration:

x = A·√ t ¯

Figure imgb0001


mit x = Bauteildicke, A = Bauteilbildungsfaktor und t = Zeit. Die Größe des Bauteilbildungsfaktors A variiert und hängt von den Eigenschaften des Schlickers beziehungsweise auch von denen des daraus gebildeten Bauteils ab.The casting mold with the conical inner part is completely filled with pourable slip according to the method according to the invention together with the slip reservoir connected to it. By diffusing the liquid phase of the slip into the absorbent, porous wall of the casting mold, solid particles are transported to the wall of the casting mold and accumulate there to form a green component. Starting from the wall of the casting mold, the component grows radially in the direction of the axis of symmetry of the rotationally symmetrical casting mold due to ever increasing solid deposition. If the thickness of the mass layer deposited on the wall of the casting mold is designated by x, then for the growth of the component from a certain thickness of the mass layer, the water transport through the component is the speed-determining step. These relationships can also be represented arithmetically, because dx / dt ∼ ¹ / x and after integration apply:

x = A · √ t ¯
Figure imgb0001

with x = component thickness, A = component formation factor and t = time. The size of the component formation factor A varies and depends on the properties of the slip and also on those of the component formed therefrom.

Wenn das Bauteil vollständig ausgebildet ist, setzt ein Schrumpfungsprozess ein, die sogenannte Trockenschwindung, die auf die Abgabe des die Feststoffpartikel umhüllenden Wassers (Hüllenwasser) zurückzuführen ist und bewirkt, daß das Bauteil von der Wandung der Gießform abschwindet. Nach Beginn der Trockenschwindung besteht zwischen dem Bauteil und der Wandung der Gießform kein Flächenkontakt mehr und das Bauteil kann leicht aus der Gießform entnommen werden.When the component is fully formed, a shrinkage process begins, the so-called dry shrinkage, which is due to the release of the water enveloping the solid particles (shell water) and causes the component to disappear from the wall of the mold. After the dry shrinkage begins, there is no longer any surface contact between the component and the wall of the casting mold and the component can be easily removed from the casting mold.

Durch den der Gießform unmittelbar vorgeschalteten Schlickervorratsbehälter fließt der für einen Guß benötigte Schlicker kontinuierlich in das konische Innenteil der Gießform nach. Ein schrittweises Eingießen der Schlickergießmasse ist für die Herstellung hochfester und mechanisch hochbelasteter Bauteile weniger geeignet, weil dadurch die mechanischen Eigenschaften des fertigen Bauteils nachteilig beeinflußt werden können.Due to the slip reservoir immediately upstream of the casting mold, the slip required for a casting flows continuously into the conical inner part of the casting mold. Gradual pouring in of the slip casting compound is less suitable for the production of high-strength and mechanically highly stressed components, because this can adversely affect the mechanical properties of the finished component.

Die Außenwand des erhaltenen Bauteils ist ein Abbild der Innenwand der Gießform. Durch die konische Ausbildung des Innenteils der Gießform wird ein kontinuierlicher Materialtransport des Schlickers aus dem Schlickervorratsbehälter in das konische Innenteil ermöglicht. Die Konizität verhindert nämlich, daß sich Feststoffablagerungen an unerwünschten Stellen innerhalb der Gießform bilden, die den Weitertransport der Schlickermasse in das Innere der Gießform behindern oder meistens sogar ganz unterbinden.The outer wall of the component obtained is an image of the inner wall of the mold. The conical design of the inner part of the casting mold enables a continuous material transport of the slip from the slip storage container into the conical inner part. This is because the taper prevents solid deposits from forming at undesired locations within the casting mold, which hinder or usually even completely prevent the further transport of the slip mass into the interior of the casting mold.

Die notwendige Konizität der Form hängt dabei einerseits vom Verhältnis Länge/Durchmesser des herzustellenden Bauteils ab, andererseits von der Qualität des Schlickers. Je größer dieses Verhältnis und je größer die Bauteilbildungsrate A des verwendeten Schlickers ist, umso größer ist auch die erforderliche Konizität. Zahlenmäßig wird die Konizität in Form der Steigung der Mantellinien eines geraden Kreiskegelstumpfes angegeben. Bei Bauteilbildungsraten A im Bereich von 0,05 bis 0,3 mm·s⁻¹ und Länge/Durchmesser Verhältnissen des fertigen Bauteils im Bereich von 5 bis 15 soll beispielsweise die Steigung der Mantellinien im Bereich von tan = 0,002 bis tan = 0,01 liegen, das entspricht einem Winkel α von 0,1 bis 0,6 °.The necessary taper of the shape depends on the one hand on the length / diameter ratio of the component to be manufactured, and on the other hand on the quality of the slip. The greater this ratio and the greater the component formation rate A of the slip used, the greater the required taper. The taper is given numerically in the form of the slope of the surface lines of a straight circular truncated cone. With component formation rates A in the range from 0.05 to 0.3 mm · s⁻¹ and length / diameter ratios of the finished component in the range from 5 to 15, for example the slope of the surface lines should be in the range from tan = 0.002 to tan = 0.01 lie, which corresponds to an angle α of 0.1 to 0.6 °.

Das erhaltene konische Bauteil muß in einem nachgeschalteten Fertigungsschritt noch durch mechanisches Bearbeiten (Abtragen) mindestens teilweise in einen Zylinder überführt werden. Nach einer möglichen Ausführungsform des erfindungsgemäßen Verfahrens wird das Bauteil umittelbar nach dem Trocknen mechanisch bearbeitet und daran anschließend gebrannt. Nach einer anderen möglichen Ausführungsform des erfindungsgemäßen Verfahrens wird das getrocknete keramische Bauteil zuerst gebrannt und die mechanische Bearbeitung dann erst vorgenommen. Das Bearbeiten (z.B. Schleifen, Läppen oder Polieren) der gebrannten Bauteile ist insbesondere bei mechanisch und gleichzeitig thermisch hochbelasteten keramischen Motorbauteilen zweckmäßig, wie z.B. bei Ventilen oder Vollkolbenbolzen. Für diese Teile, ist die durch Brennen erreichbare Oberflächenqualität nicht in vollem Umfang ausreichend, so daß eine nachträgliche Oberflächenvergütung erforderlich wird. Auch wenn an dem Bauteil zusätzliche Funktionsflächen wie Gleit- und Dichtflächen vorgesehen sind, ist eine nachträgliche Endbearbeitung der entsprechenden Bauteile notwendig.The conical component obtained must at least partially be converted into a cylinder by mechanical processing (removal) in a subsequent production step. According to a possible embodiment of the method according to the invention, the component is mechanically processed immediately after drying and then fired. According to another possible embodiment of the method according to the invention, the dried ceramic component is first fired and then the mechanical processing is carried out. The processing (e.g. grinding, lapping or polishing) of the fired components is particularly expedient in the case of ceramic engine components which are subject to high mechanical and thermal loads, such as, for example, valves or solid piston pins. For these parts, the one that can be achieved by firing Surface quality is not fully sufficient, so that a subsequent surface treatment is required. Even if additional functional surfaces such as sliding and sealing surfaces are provided on the component, subsequent finishing of the corresponding components is necessary.

Durch die beigefügten Zeichnungen soll die Erfindung nachfolgend beispielhaft für den Fachmann noch detlicher erläutert werden, ohne jedoch auf die konkret dargestellte Ausführungsform beschränkt zu sein.The accompanying drawings are intended to explain the invention in greater detail below by way of example for a person skilled in the art, but without being restricted to the specific embodiment shown.

Figur 1 zeigt einen senkrechten Schnitt durch eine Gießform mit zylindrischem Innenteil in seitlicher Ansicht.Figure 1 shows a vertical section through a casting mold with a cylindrical inner part in a side view.

Figur 2 zeigt einen senkrechten Schnitt durch eine Gießform mit konischem Innenteil in seitlicher Ansicht.Figure 2 shows a vertical section through a casting mold with a conical inner part in a side view.

Die Ausführungsform nach Figur 1 ist die nach dem Stand der Technik gebräuchliche. Mit Bezugszeichen sind im einzelnen der Schlickervorratsbehälter 1, der dem zylindrischen Innenteil 3 unmittelbar vorgeschaltet ist, hervorgehoben. Bei der in Figur 1 dargestellten Ausführungsform kann nicht ausgeschlossen werden, daß es gelegentlich im Bereich des zylindrischen Innenteils zu Feststoffablagerungen kommt, die in der Zeichnung nicht dargestellt sind, die aber gleichwohl ein Nachfließen von Schlicker aus dem Vorratsbehälter 1 in die von der Eingußstelle 2 entfernter liegenden Bereiche des zylindrischen Innenteils 3 verhindern und so zur Bildung eines unerwünschten Lunkers im fertigen Bauteil führen. Die Gießform 4 selbst besteht aus saugfähigem, porösem Material, meist Gips. In Figur 2 haben gleiche Bezugsziffern gleiche Bedeutung. Deutlich erkennbar aber ist, daß das Innenteil 3 der Gießform 4 eine nach oben sich konisch öffnende Form besitzt. Dadurch ist die Eingußstelle 2 verbreitert und es kann nicht mehr zu den unerwünschten Feststoffablagerungen kommen.The embodiment according to FIG. 1 is the one used according to the prior art. The slip reservoir 1, which is directly upstream of the cylindrical inner part 3, is highlighted in detail with reference numerals. In the embodiment shown in FIG. 1, it cannot be ruled out that solid deposits occasionally occur in the area of the cylindrical inner part, which are not shown in the drawing, but which nevertheless cause slurry to flow out of the storage container 1 into that remote from the pouring point 2 prevent lying areas of the cylindrical inner part 3 and thus lead to the formation of an undesirable blowhole in the finished component. The casting mold 4 itself consists of absorbent, porous material, usually plaster. In FIG. 2, the same reference numbers have the same meaning. But it is clearly recognizable that the inner part 3 of the casting mold 4 has a shape which opens conically upwards. As a result, the pouring point 2 is widened and undesirable solid deposits can no longer occur.

Das erfindungsgemäße Verfahren eignet sich besonders zur Herstellung von keramischen Bauteilen aus Siliziumnitrid. Dabei ist es möglich, Schlickergießmassen wahlweise auf Basis von Siliziumnitrid oder von Silizium einzusetzen. Beim Sintern in Stickstoffatmosphäre wandelt sich das Silizium in Siliziumnitrid um. Nach dem erfindungsgemäßen Verfahren lassen sich (zylindrische) Vollkolbenbolzen oder Ventilschäfte (mit zylindrischen Teilabschnittten) herstellen. Mittels der Meßmethode der Röntgengrobstrukturanalyse läßt sich zeigen, daß Lunker im Bereich der Zylinder-Symmetrieachse bei nach dem erfindungsgemäßen Verfahren hergestellten Bauteilen im Rahmen der Meßgenauigkeit nicht nachgewiesen werden können.The method according to the invention is particularly suitable for the production of ceramic components made of silicon nitride. It is possible to use slip casting compounds either based on silicon nitride or silicon. When sintering in a nitrogen atmosphere, the silicon converts to silicon nitride. The process according to the invention can be used to produce (cylindrical) full piston pins or valve stems (with cylindrical sections). Using the measurement method of coarse X-ray structure analysis, it can be shown that cavities in the area of the axis of symmetry of the cylinder cannot be detected within the scope of the measurement accuracy in the case of components produced by the method according to the invention.

Claims (8)

Verfahren zur Herstellung eines massiven keramischen Bauteils, das mindestens teilweise eine zylindrische Mantelfläche aufweist, dadurch gekennzeichnet, daß ein gießfähiger keramischer Schlicker in eine saugfähige Gießform mit nach unten konisch verjüngtem Innenteil, die an einen Schlickervorratsbehälter angeschlossen ist, eingebracht wird, daß das in dem konischen Innenteil der Gießform entstandene grüne massive Bauteil mit konischer Oberfläche dem Innenteil entnommen wird und daß in einem nachgeschalteten Fertigungsschritt die konische Oberfläche des Bauteils mindestens teilweise durch mechanische Bearbeitung in eine zylindrische Mantelfläche überführt wird.A process for the production of a solid ceramic component which at least partially has a cylindrical outer surface, characterized in that a pourable ceramic slip is introduced into an absorbent casting mold with an inner part which tapers conically downwards and which is connected to a slip reservoir, in such a way that this is done in the conical The green solid component with a conical surface that has arisen from the inner part of the casting mold is removed from the inner part and that, in a subsequent production step, the conical surface of the component is at least partially converted into a cylindrical outer surface by mechanical processing. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Gießform mit dem konischen Innenteil zusammen mit dem daran angeschlossenen Schlickervorratsbehälter vollständig mit gießfähigem Schlicker gefüllt wird.A method according to claim 1, characterized in that the casting mold with the conical inner part together with the slip reservoir connected thereto is completely filled with pourable slip. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Bauteil in einem zusätzlichen Fertigungsschritt gebrannt wird.Method according to claim 1 or 2, characterized in that the component is fired in an additional manufacturing step. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Brennen vor der mechanischen Bearbeitung des Bauteils vorgenommen wird.Method according to claim 3, characterized in that the firing is carried out before the mechanical processing of the component. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Brennen nach der mechanischen Bearbeitung des Bauteils vorgenommen wird.A method according to claim 3, characterized in that the firing is carried out after the mechanical processing of the component. Massives keramisches Bauteil hergestellt nach einem Verfahren nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß das Bauteil als Hauptbestandteil Siliziumnitrid enthält.Solid ceramic component produced by a method according to one of claims 1 to 5, characterized in that the component contains silicon nitride as the main component. Verwendung eines Bauteils nach Anspruch 6 als Ventil in Verbrennungsmotoren.Use of a component according to claim 6 as a valve in internal combustion engines. Verwendung eines Bauteils nach Anspruch 6 als Kolbenbolzen in Kolbenpumpen oder Verbrennungsmotoren.Use of a component according to claim 6 as piston pin in piston pumps or internal combustion engines.
EP92112098A 1991-07-18 1992-07-15 Process for making a full ceramic element and element manufactured by the process Withdrawn EP0523670A1 (en)

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DE4123794 1991-07-18
DE4123794A DE4123794C1 (en) 1991-07-18 1991-07-18
DE4203639A DE4203639A1 (en) 1992-02-08 1992-02-08 Solid cleaning component production method
DE4203639 1992-02-08

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Publication number Priority date Publication date Assignee Title
US1694563A (en) * 1927-02-02 1928-12-11 Donald W Ross Method of molding ceramic materials
DE3112497A1 (en) * 1980-06-26 1982-04-08 Ra&ccaron;kov, Vladimir Semenovi&ccaron;, Moskva Compression mould for producing products from pulverulent materials
EP0364278A1 (en) * 1988-10-14 1990-04-18 Ngk Insulators, Ltd. Ceramic valves for use in internal combustion engines and a process for producing the same
GB2232115A (en) * 1989-05-31 1990-12-05 Hoechst Ag Ceramic castings

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1694563A (en) * 1927-02-02 1928-12-11 Donald W Ross Method of molding ceramic materials
DE3112497A1 (en) * 1980-06-26 1982-04-08 Ra&ccaron;kov, Vladimir Semenovi&ccaron;, Moskva Compression mould for producing products from pulverulent materials
EP0364278A1 (en) * 1988-10-14 1990-04-18 Ngk Insulators, Ltd. Ceramic valves for use in internal combustion engines and a process for producing the same
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JPH05185409A (en) 1993-07-27
MX9204228A (en) 1993-01-01
KR930002053A (en) 1993-02-22
BR9202721A (en) 1993-03-23

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