EP0181255B1 - Process for the production of a ceramic turbine ring integrated into a metalic support - Google Patents

Process for the production of a ceramic turbine ring integrated into a metalic support Download PDF

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Publication number
EP0181255B1
EP0181255B1 EP85402051A EP85402051A EP0181255B1 EP 0181255 B1 EP0181255 B1 EP 0181255B1 EP 85402051 A EP85402051 A EP 85402051A EP 85402051 A EP85402051 A EP 85402051A EP 0181255 B1 EP0181255 B1 EP 0181255B1
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EP
European Patent Office
Prior art keywords
ceramic element
manufacturing
turbine ring
ceramic
ring according
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
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EP85402051A
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German (de)
French (fr)
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EP0181255A1 (en
Inventor
Alain Marie Lardellier
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Safran Aircraft Engines SAS
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Societe Nationale dEtude et de Construction de Moteurs dAviation SNECMA
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D25/00—Special casting characterised by the nature of the product
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/08—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator
    • F01D11/12—Preventing or minimising internal leakage of working-fluid, e.g. between stages for sealing space between rotor blade tips and stator using a rubstrip, e.g. erodible. deformable or resiliently-biased part
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/4932—Turbomachine making

Definitions

  • the invention relates to a manufacturing method applicable in particular to turbine rings composed of a ceramic element integrated into an annular metal support.
  • FR-A-2 371 575 thus describes a turbine ring in which a ceramic ring is formed by the juxtaposition of segments.
  • This type of solution requires a relatively complicated and costly method of manufacture and assembly. Furthermore, the inevitable discontinuities, at the level of the coupled edges of the segments, are detrimental to good gas flow.
  • An improvement described by FR-A-2 540 938 provides for elastic fixing of the ceramic segments to a ring by a screw whose head transmits to the segment an axial force which applies it against the ring.
  • FR-A-2 559 634 plans to use a one-piece ceramic ring, which makes it possible to avoid some of the drawbacks mentioned above.
  • the mounting method proposed in this case by means of an annular support made of wound ceramic material, allows a compression prestressing of the ceramic ring but is not however entirely satisfactory in all applications.
  • a ceramic turbine ring makes it possible to avoid the drawbacks noted above and also avoids the use of an additional ring made of wound ceramic material, which makes this solution more complex and also requires the use of connecting means between the ceramic ring and its annular support, such as screws and inserts.
  • the method according to the invention aims to produce a ceramic turbine ring integrated into an annular metal support.
  • the first stage of the process consists of a molding operation in the form of a ceramic element such as 1 visible in FIGS. 1 and 2 representing a later stage of the process.
  • This molding operation only uses methods known commonly used to obtain molded ceramic elements.
  • This ceramic element 1 can constitute a continuous monobloc ring, as shown in FIGS. 1 and 2 and it has pins 2 and 3 on its external diameter and on its internal diameter obtained during the molding operation.
  • the ceramic elements obtained by molding can also be in the form of separate segments or blocks, capable of being assembled to form a ring. Such segments 1a are represented in FIG. 4.
  • a ceramic element can be of the type represented in FIGS. 5 and 6 such as 1b and include on the external diameter of the anchors such as 4 and possibly also on the sides of the ceramic element of the anchors such as 5.
  • These anchors 4 or 5 may or may not be annular and have any shape compatible with their mode of production by molding. These anchoring details can also be applied to the continuous ring of the type shown in FIGS. 1 and 2.
  • This ceramic element 1 thus obtained and defined, in a ring or in segments, is then placed between an internal part 6 and an external part 7 of a tool 8 between which is formed an annular cavity 9, this tool 8 'constituting a casting mold.
  • the pins 2 and 3 mentioned above are used for positioning and holding in place the ceramic element 1 in the annular cavity 9.
  • a centrifugal casting operation is then carried out while respecting the precautions specific to this known casting method.
  • the molten metal is introduced into the tool 8 which, during this time, is rotated about its axis.
  • the annular cavity 9 is filled with molten metal and the tool 8 is kept in rotation until the metal solidifies completely.
  • This finished part 10 shown in Figures 3 and 4 thus consists of a ceramic element 1 held inside a metal support 11 to which this ceramic element 1 adheres perfectly.
  • the metal support 11 includes one, or more, flange (s) such as 12 used for assembling the part in the turbine (see FIG. 3).
  • the metallic material exerts a compression of the ceramic element 1. It a compression prestress of the ceramic results which may be weak, or even cancel out in operation, when the ring is used after mounting on a turbine, but in no case does it appear any tensile force of the support metal on the ceramic, which would be seriously detrimental to good service performance of the ceramic element.
  • a type of ceramic which is best suited to the conditions of use envisaged can be chosen for the manufacture of the ceramic element 1.
  • a homogeneous or composite ceramic can be used.
  • the pins 2 or 3 intended to hold the ceramic element 1 between the two parts 6 and 7 of the tool 8 before and during the metal casting operation can be replaced by attached spacers.
  • the annular housing of the ceramic element 1 in the metal support 11 can have any shape of section, rectangular or trapezoidal or other.
  • the annular part 10 obtained before mounting on a turbine can also be segmented by sawing.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Ceramic Products (AREA)
  • Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)

Description

L'invention concerne un procédé de fabrication applicable notamment aux anneaux de turbine composés d'un élément céramique intégré à un support métallique annulaire.The invention relates to a manufacturing method applicable in particular to turbine rings composed of a ceramic element integrated into an annular metal support.

Les avantages de l'utilisation de matériaux céramiques pour constituer des anneaux d'étanchéité de stator de turbine disposés au regard du rotor d'un étage de la turbine sont bien connus. La faible conductivité thermique de ces matériaux leur procure en effet une efficacité remarquable en tant que barrière thermique et leur utilisation permet ainsi de définir des éléments de stator, en particulier des carters, répondant plus facilement aux autres exigences de leur fonction, à moindre coût et avec une mise en oeuvre facilitée. La bonne résistance des matériaux céramiques aux températures élevées permet notamment de réduire ou dans certains cas de supprimer tout refroidissement et de réduire ainsi le débit d'air de ventilation, ce qui permet des gains en rendement appréciables. Ces matériaux présentent également notamment des propriétés de résistance à la corrosion à chaud qui sont avantageuses pour leur utilisation dans les anneaux de turbine.The advantages of using ceramic materials to form turbine stator sealing rings arranged facing the rotor of a stage of the turbine are well known. The low thermal conductivity of these materials gives them remarkable efficiency as a thermal barrier and their use thus makes it possible to define stator elements, in particular casings, which more easily meet the other requirements of their function, at lower cost and with easier implementation. The good resistance of ceramic materials to high temperatures makes it possible in particular to reduce or in certain cases to eliminate any cooling and thus to reduce the ventilation air flow, which allows appreciable gains in efficiency. These materials also in particular have properties of resistance to hot corrosion which are advantageous for their use in turbine rings.

Par contre, l'extension de l'utilisation des matériaux céramiques pour des anneaux de turbine a été freinée par diverses contraintes tenant à des difficultés de mise en oeuvre de ce type de solution dans ces applications. En particulier, les matériaux céramiques, surtout lorsqu'il s'agit de matériaux du type massiques, compacts, ont une mauvaise tenue lorsqu'ils sont soumis a des efforts de traction. Par ailleurs, leur faible coefficient de dilatation thermique provoque des défauts sérieux en fonctionnement au niveau de leurs liaisons sur des supports métalliques. Plusieurs solutions ont tenté de résoudre ces problèmes.On the other hand, the extension of the use of ceramic materials for turbine rings has been slowed down by various constraints relating to the difficulties of implementing this type of solution in these applications. In particular, ceramic materials, especially when they are materials of the mass, compact type, have poor behavior when subjected to tensile forces. In addition, their low coefficient of thermal expansion causes serious operating faults at the level of their connections on metal supports. Several solutions have attempted to resolve these problems.

FR-A-2 371 575 décrit ainsi un anneau de turbine dans lequel un anneau céramique est constitué par la juxtaposition de segments. Ce type de solution impose un mode de fabrication et de montage relativement compliqué et coûteux. Par ailleurs, les discontinuités inévitables, au niveau des bords accouplés des segments, sont préjudiciables à un bon écoulement des gaz.FR-A-2 371 575 thus describes a turbine ring in which a ceramic ring is formed by the juxtaposition of segments. This type of solution requires a relatively complicated and costly method of manufacture and assembly. Furthermore, the inevitable discontinuities, at the level of the coupled edges of the segments, are detrimental to good gas flow.

Un perfectionnement décrit par FR-A-2 540 938 prévoit de fixer élastiquement les segments en céramique à un anneau par une vis dont la tête transmet au segment une force axifuge qui l'applique contre l'anneau.An improvement described by FR-A-2 540 938 provides for elastic fixing of the ceramic segments to a ring by a screw whose head transmits to the segment an axial force which applies it against the ring.

FR-A-2 559 634 prévoit d'utiliser un anneau en céramique d'une seule pièce, ce qui permet d'éviter quelques-uns des inconvénients mentionnés ci-dessus. Le mode de montage proposé dans ce cas, au moyen d'un support annulaire en matériau céramique bobiné, permet une mise en précontrainte de compression de l'anneau céramique mais n'est pas toutefois entièrement satisfaisant dans toutes les applications.FR-A-2 559 634 plans to use a one-piece ceramic ring, which makes it possible to avoid some of the drawbacks mentioned above. The mounting method proposed in this case, by means of an annular support made of wound ceramic material, allows a compression prestressing of the ceramic ring but is not however entirely satisfactory in all applications.

Le procédé de fabrication, selon l'invention, d'un anneau de turbine en céramique permet d'éviter les inconvénients notés ci-dessus et évite également l'utilisation d'un anneau supplémentaire en matériau céramique bobiné, ce qui rend cette solution plus complexe et impose également l'utilisation des moyens de liaison entre l'anneau céramique et son support annulaire, tels que des vis et des inserts.The method of manufacturing, according to the invention, a ceramic turbine ring makes it possible to avoid the drawbacks noted above and also avoids the use of an additional ring made of wound ceramic material, which makes this solution more complex and also requires the use of connecting means between the ceramic ring and its annular support, such as screws and inserts.

Le procédé de fabrication selon l'invention est caractérisé en ce qu'il comporte les étapes suivantes :

  • a) une opération de moulage en forme d'un élément céramique,
  • b) la mise en place de l'élément céramique obtenu en a) dans la cavité annulaire d'un outillage qui constitue un moule de coulée,
  • c) une coulée par centrifugation d'un matériau métallique dans la cavité dudit moule qui est entraîné en rotation jusqu'à la fin de la solidification,
  • d) un démoulage de la pièce obtenue en c) par démontage dudit moule,
  • e) un usinage de la pièce obtenue en d), de manière à ce que la pièce obtenue soit utilisable comme anneau de turbine constitué d'un élément céramique annulaire fretté dans un support métallique annulaire.
The manufacturing process according to the invention is characterized in that it comprises the following stages:
  • a) a molding operation in the form of a ceramic element,
  • b) placing the ceramic element obtained in a) in the annular cavity of a tool which constitutes a casting mold,
  • c) a centrifugal casting of a metallic material in the cavity of said mold which is rotated until the end of solidification,
  • d) demolding the part obtained in c) by dismantling said mold,
  • e) machining the part obtained in d), so that the part obtained can be used as a turbine ring consisting of an annular ceramic element hooped in an annular metal support.

D'autres caractéristiques et avantages de l'invention seront mieux compris à l'aide de la description ci-après, en se référant aux dessins annexés dans lesquels :

  • la figure 1 représente, selon une vue partielle et schématique en coupe, une étape du procédé de fabrication d'un anneau de turbine selon l'invention dans laquelle un élément céramique est placé dans un outillage constituant un moule de coulée,
  • la figure 2 représente une vue en coupe selon II-Il du dispositif de la figure 1,
  • la figure 3 représente, selon une vue en section par un plan contenant son axe géométrique, un anneau de turbine obtenu par le procédé conforme à l'invention,
  • la figure 4 représente une vue en coupe selon IV-IV de l'anneau de turbine de la figure 3,
  • la figure 5 représente, selon une vue en section par un plan contenant son axe géométrique, une variante d'anneau de turbine obtenu par le procédé conforme à l'invention,
  • la figure 6 représente une vue partielle en coupe selon VI-VI de la figure 5.
  • la figure 7 représente, selon une vue en perspective avec coupe, un secteur d'anneau de turbine également obtenu par le procédé conforme à l'invention.
Other characteristics and advantages of the invention will be better understood with the aid of the description below, with reference to the appended drawings in which:
  • FIG. 1 represents, in a partial schematic view in section, a step in the process for manufacturing a turbine ring according to the invention in which a ceramic element is placed in a tool constituting a casting mold,
  • FIG. 2 represents a sectional view along II-II of the device of FIG. 1,
  • FIG. 3 represents, in a view in section through a plane containing its geometric axis, a turbine ring obtained by the process according to the invention,
  • FIG. 4 represents a sectional view along IV-IV of the turbine ring of FIG. 3,
  • FIG. 5 represents, in a sectional view through a plane containing its geometric axis, a variant of a turbine ring obtained by the process according to the invention,
  • FIG. 6 represents a partial sectional view along VI-VI of FIG. 5.
  • Figure 7 shows, in a perspective view with section, a turbine ring sector also obtained by the method according to the invention.

Le procédé selon l'invention vise à réaliser un anneau de turbine en céramique intégré à un support métallique annulaire. La première étape du processus consiste en une opération de moulage en forme d'un élément en céramique tel que 1 visible sur les figures 1 et 2 représentant une étape ultérieure du procédé. Cette opération de moulage ne fait appel qu'à des méthodes connues couramment utilisées pour obtenir des éléments céramiques moulés. Cet élément céramique 1 peut constituer un anneau monobloc continu, comme représenté sur les figures 1 et 2 et il comporte sur son diamètre externe et sur son diamètre interne des picots 2 et 3 obtenues lors de l'opération de moulage. Selon la définition de l'anneau de turbine qui a été retenue. les éléments céramiques obtenus par moulage peuvent également se présenter sous forme de segments ou blocs séparés, susceptibles d'être assemblés pour former un anneau. De tels segments 1a sont représentés à la figure 4. En dehors des picots 2 et 3 présents sur les surfaces externes de l'élément céramique 1, un élément céramique peut être du type représenté aux figures 5 et 6 tel que 1b et comporter sur le diamètre externe des ancrages tels que 4 et éventuellement également sur les flancs de l'élément céramique des ancrages tels que 5. Ces ancrages 4 ou 5 peuvent ou non être annulaires et présenter toute forme compatible avec leur mode d'obtention par moulage. Ces détails d'ancrages peuvent aussi être appliqués sur l'anneau continu du type représenté aux figures 1 et 2.The method according to the invention aims to produce a ceramic turbine ring integrated into an annular metal support. The first stage of the process consists of a molding operation in the form of a ceramic element such as 1 visible in FIGS. 1 and 2 representing a later stage of the process. This molding operation only uses methods known commonly used to obtain molded ceramic elements. This ceramic element 1 can constitute a continuous monobloc ring, as shown in FIGS. 1 and 2 and it has pins 2 and 3 on its external diameter and on its internal diameter obtained during the molding operation. According to the definition of the turbine ring that was chosen. the ceramic elements obtained by molding can also be in the form of separate segments or blocks, capable of being assembled to form a ring. Such segments 1a are represented in FIG. 4. Apart from the pins 2 and 3 present on the external surfaces of the ceramic element 1, a ceramic element can be of the type represented in FIGS. 5 and 6 such as 1b and include on the external diameter of the anchors such as 4 and possibly also on the sides of the ceramic element of the anchors such as 5. These anchors 4 or 5 may or may not be annular and have any shape compatible with their mode of production by molding. These anchoring details can also be applied to the continuous ring of the type shown in FIGS. 1 and 2.

Cet élément céramique 1 ainsi obtenu et défini, en anneau ou en segments, est ensuite mis en place entre une partie interne 6 et une partie externe 7 d'un outillage 8 entre lesquelles est ménagée une cavité annulaire 9, cet outillage 8 'constituant un moule de coulée. Les picots 2 et 3 mentionnés ci-dessus sont utilisés pour le positionnement et le maintien en place de l'élément céramique 1 dans la cavité annulaire 9.This ceramic element 1 thus obtained and defined, in a ring or in segments, is then placed between an internal part 6 and an external part 7 of a tool 8 between which is formed an annular cavity 9, this tool 8 'constituting a casting mold. The pins 2 and 3 mentioned above are used for positioning and holding in place the ceramic element 1 in the annular cavity 9.

On procède ensuite à une opération de coulée par centrifugation en respectant les précautions propres à cette méthode connue de coulée. Le métal en fusion est introduit dans l'outillage 8 qui, pendant ce temps, est entraîné en rotation autour de son axe. La cavité annulaire 9 est remplie par le métal en fusion et l'outillage 8 est maintenu en rotation jusqu'à la solidification complète du métal.A centrifugal casting operation is then carried out while respecting the precautions specific to this known casting method. The molten metal is introduced into the tool 8 which, during this time, is rotated about its axis. The annular cavity 9 is filled with molten metal and the tool 8 is kept in rotation until the metal solidifies completely.

Le démoulage de la pièce obtenue est ensuite effectué par démontage du moule de coulée 8. Des usinages complémentaires sont habituellement nécessaires pour obtenir une pièce finie présentant des cotes précises exigées pour le montage de la pièce sur une turbine. Cette pièce finie 10 représentée aux figures 3 et 4 se compose ainsi d'un élément céramique 1 maintenu à l'intérieur d'un support métallique 11 auquel cet élément céramique 1 adhère parfaitement. Le support métallique 11 comporte une, ou plusieurs, bride(s) telle que 12 utilisée pour l'assemblage de la pièce dans la turbine (voir figure 3).The release of the part obtained is then carried out by dismantling the casting mold 8. Complementary machining is usually necessary to obtain a finished part having precise dimensions required for mounting the part on a turbine. This finished part 10 shown in Figures 3 and 4 thus consists of a ceramic element 1 held inside a metal support 11 to which this ceramic element 1 adheres perfectly. The metal support 11 includes one, or more, flange (s) such as 12 used for assembling the part in the turbine (see FIG. 3).

Le procédé selon l'invention qui vient d'être décrit permet également d'obtenir des anneaux du type représenté à la figure 7 qui présente un secteur d'un tel anneau dans lequel des pavés en matériau céramique 13 sont « emprisonnés dans une matrice métallique 14 qui a été obtenue par l'opération de coulée par centrifugation, ces pavés pouvant présenter toutes formes particulières, dont un exemple est représenté à la figure 7 et qui permettent leur « emprisonnement •.The method according to the invention which has just been described also makes it possible to obtain rings of the type represented in FIG. 7 which presents a sector of such a ring in which pavers of ceramic material 13 are "trapped in a metallic matrix 14 which was obtained by the centrifugal casting operation, these blocks may have any particular shape, an example of which is shown in FIG. 7 and which allow their "imprisonment".

Parmi les avantages obtenus par le procédé conforme à l'invention, on doit noter qu'au cours de la solidification complète du métal qui suit la coulée proprement dite, le matériau métallique exerce une mise en compression de l'élément céramique 1. Il en résulte une précontrainte de compression de la céramique qui peut être faible, voire s'annuler en fonctionnement, lors de l'utilisation de l'anneau après montage sur une turbine, mais en aucun cas il n'apparaît d'effort de traction du support métallique sur la céramique, ce qui serait gravement préjudiciable à une bonne tenue en service de l'élément céramique.Among the advantages obtained by the process according to the invention, it should be noted that during the complete solidification of the metal which follows the actual casting, the metallic material exerts a compression of the ceramic element 1. It a compression prestress of the ceramic results which may be weak, or even cancel out in operation, when the ring is used after mounting on a turbine, but in no case does it appear any tensile force of the support metal on the ceramic, which would be seriously detrimental to good service performance of the ceramic element.

On notera qu'un type de céramique le mieux adapté aux conditions d'utilisation prévues peut être choisi pour la fabrication de l'élément céramique 1. En particulier, une céramique homogène ou composite peut être utilisée.It will be noted that a type of ceramic which is best suited to the conditions of use envisaged can be chosen for the manufacture of the ceramic element 1. In particular, a homogeneous or composite ceramic can be used.

Diverses variantes dont les détails de réalisation sont immédiatement à la portée de l'homme du métier s'inscrivent également dans l'objet de l'invention. Ainsi les picots 2 ou 3 destinés au maintien de l'élément céramique 1 entre les deux parties 6 et 7 de l'outillage 8 avant et pendant l'opération de coulée du métal peuvent être remplacés par des entretoises rapportées. De même, le logement annulaire de l'élément céramique 1 dans le support métallique 11 peut avoir toute forme de section, rectangulaire ou trapézoïdale ou autre. Par ailleurs, la pièce annulaire 10 obtenue avant montage sur une turbine peut également être segmentée par sciage.Various variants, the details of which are immediately accessible to those skilled in the art, also fall within the object of the invention. Thus the pins 2 or 3 intended to hold the ceramic element 1 between the two parts 6 and 7 of the tool 8 before and during the metal casting operation can be replaced by attached spacers. Similarly, the annular housing of the ceramic element 1 in the metal support 11 can have any shape of section, rectangular or trapezoidal or other. Furthermore, the annular part 10 obtained before mounting on a turbine can also be segmented by sawing.

Claims (12)

1. Method of manufacturing a ceramic turbine ring rigid with an annular metallic support characterised in that it comprises the following steps :
a) moulding to shape a ceramic element (1 ; 1a; 1b);
b) locating the ceramic element (1 ; 1a ; 1b) obtained in step a) in the annular cavity (9) of an assembly (8) which forms a casting mould ;
c) centrifugally casting a metallic material in the cavity (9) of the said mould (8) which is rotatably driven until solidification of the material is complete ;
d) demoulding the part (10) obtained in step c) by disassembling the said mould (8) ;
e) machining the part (10) obtained in step d) ; such that the part (10) obtained is usable as a turbine ring constituted by an annular ceramic element (1 ; 1a; 1b) ringed in an annular metallic support (11).
2. Method of manufacturing a turbine ring according to claim 1, characterised in that the ceramic element (1 ; 1a ; 1b) obtained in step a) is made of a homogeneous ceramic.
3. Method of manufacturing a turbine ring according to claim 1, characterised in that the ceramic element (1 ; 1 a ; 1 b) obtained in step a) is made of a composite ceramic.
4. Method of manufacturing a turbine ring according to any one of claims 1 to 3, characterised in that in steps b) and c), the ceramic element (1 ; 1a; 1b) is maintained in position in the assembly (8) by means of ceramic spacers.
5. Method of manufacturing a turbine ring according to any one of claims 1 to 3, characterised in that the ceramic element (1 ; 1a; 1b) obtained in step a) comprises protections (2, 3) intended in steps b) and c) to maintain the ceramic element (1 ; 1a ; 1b) in position in the assembly (8).
6. Method of manufacturing a turbine ring according to any one of claims to 5, characterised in that the-ceramic element is a monobloc ring.
7. Method of manufacturing a turbine ring according to any one of claims 1 to 5, characterised in that the ceramic element (1a) is constituted by segments disposed as a ring in step b).
8. Method of manufacturing a turbine ring according to any one of the preceding claims, characterised in that the ceramic element (1 b) obtained in step a) comprises female type anchorages (4 ; 5) which are filled with metallic material in step c) so as to lock the ceramic element into the annular metallic support.
9. Method of manufacturing a turbine ring according to claim 8, characterised in that the said anchorages (4 ; 5) are formed on the outer periphery and on the sides of the ceramic element.
10. Method of manufacturing a turbine ring according to any one of the preceding claims, characterised in that the casting in step c) is under vacuum.
11. Method of manufacturing a turbine ring according to any one of claims 1 to 9, characterised in that the casting. in step c) is under a protective atmosphere.
12. Method of manufacturing a turbine ring according to any one of the preceding claims, characterised in that the machining in step e) comprises sawing of the annular part (10) into segments.
EP85402051A 1984-10-30 1985-10-23 Process for the production of a ceramic turbine ring integrated into a metalic support Expired EP0181255B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8416535A FR2572394B1 (en) 1984-10-30 1984-10-30 METHOD FOR MANUFACTURING A CERAMIC TURBINE RING INTEGRATED WITH AN ANNULAR METAL SUPPORT
FR8416535 1984-10-30

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EP0181255A1 EP0181255A1 (en) 1986-05-14
EP0181255B1 true EP0181255B1 (en) 1987-12-23

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US (1) US4646810A (en)
EP (1) EP0181255B1 (en)
JP (1) JPS61119370A (en)
DE (1) DE3561231D1 (en)
FR (1) FR2572394B1 (en)

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JPS61119370A (en) 1986-06-06
JPH0247309B2 (en) 1990-10-19
EP0181255A1 (en) 1986-05-14
DE3561231D1 (en) 1988-02-04
US4646810A (en) 1987-03-03
FR2572394B1 (en) 1986-12-19
FR2572394A1 (en) 1986-05-02

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