EP0206107B1 - Hybrid metal-ceramic turbine vane - Google Patents

Hybrid metal-ceramic turbine vane Download PDF

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Publication number
EP0206107B1
EP0206107B1 EP86107927A EP86107927A EP0206107B1 EP 0206107 B1 EP0206107 B1 EP 0206107B1 EP 86107927 A EP86107927 A EP 86107927A EP 86107927 A EP86107927 A EP 86107927A EP 0206107 B1 EP0206107 B1 EP 0206107B1
Authority
EP
European Patent Office
Prior art keywords
core
blade
blade according
pin
insulator
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
EP86107927A
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German (de)
French (fr)
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EP0206107A2 (en
EP0206107A3 (en
Inventor
Werner Dr.-Ing. Hüther
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.)
MTU Aero Engines GmbH
Original Assignee
MTU Motoren und Turbinen Union Muenchen GmbH
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
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Publication of EP0206107A2 publication Critical patent/EP0206107A2/en
Publication of EP0206107A3 publication Critical patent/EP0206107A3/en
Application granted granted Critical
Publication of EP0206107B1 publication Critical patent/EP0206107B1/en
Expired legal-status Critical Current

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Classifications

    • 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
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/30—Fixing blades to rotors; Blade roots ; Blade spacers
    • F01D5/3084—Fixing blades to rotors; Blade roots ; Blade spacers the blades being made of ceramics

Definitions

  • the invention relates to a hybrid blade, in particular a guide or moving blade of a turbomachine composed of metal-ceramic, the more temperature-resistant material forming the outer part. Blades composed in this way are already known from DE-A-28 34 843 and DE-C-28 34 864.
  • DE-A-3110 096 describes a blade with the features of the preamble of claim 1. Proceeding from this, the object of the invention is to create a blade which can compensate for the different thermal expansion coefficients of the metallic core and the ceramic jacket, depending on the material used, allows a large core cross section and avoids local stress peaks in the ceramic jacket and both are easy to machine are.
  • the solution according to the invention is that the pin (7) is formed in one piece with the blade casing (4), that the core (1) is designed in a U-shape so that its leg ends over the pin (7) in the longitudinal direction of the blade can be inserted into the blade root (5), after which the base of the core (1) rests on the pin (7) with the interposition of an insulator (3) and the leg ends of the core (2) are fixed in the blade root (5) so that they cannot be detached.
  • the main advantage of the invention is that the ceramic is under pressure in the transition area from metal to ceramic. This transition area is relatively small, so that thermal expansion can be controlled safely. In addition, the heat transfer from the jacket to the core is reduced. Both are easy to edit.
  • the outer shirt-like part consists of ceramic, in particular of fiber-reinforced ceramic such as SiC fibers in SiC or SiC fibers in Si 3 N 4 or carbon fiber reinforced carbon with a silicon carbide protective layer.
  • the core has the reference number 1, it is in one piece, U-shaped and penetrated by a slot 2 which extends in the longitudinal direction of the blade and does not extend over the entire length, as shown in FIG. 3, but ends earlier at a base.
  • the width of the slot is dimensioned such that it can accommodate the insulator 3, shown in FIG. 2, which serves the connection between the core 1 and the jacket 4.
  • the jacket 4 has a greater height than the core and a cavity 8 in the central area for receiving the core 1.
  • the foot is designated 5 and receives the shirt 4 in a recess 6.
  • the jacket has a pin 7 in the slot 2 comes to rest.
  • the foot 5 e.g. a dovetail foot or a fir tree foot also receives the U-shaped core 1 conversely at its center. It is preferably made of metallic material, identical or similar to the core 1, preferably by eroding from solid material. It can also be produced in an investment casting process.
  • the jacket 4 made of high-temperature-resistant ceramic is preferably produced by injection molding a sinterable SiC material or Si 3 N 4 or by cold isostatic pressing of a ceramic powder in a mold with a core and subsequent processing of the green compact to the almost final shape.
  • the core 1 is produced, for example, by investment casting, if desired, post-processing by grinding is possible.
  • the core can also be eroded from solid, in particular metallic material, or can be produced in single crystal by directional solidification in the casting process.
  • the slot 2 which is produced in the usual way, for example by milling, is ground on its contact surfaces with the insulator 3 and the pin 7.
  • Another fine processing can also be used, which is suitable for delivering smooth parallel surfaces, as are also desired on the insulator. This should enable a slight displacement of the jacket and core due to thermal expansion during operation.
  • the parallelism of the contact surfaces to each other should, for. B. be less than 0.5 fJ.m.
  • the insulator 3 should preferably consist of partially stabilized zirconium oxide as a high-temperature-resistant ceramic, in particular Y 2 0 3 in ZrO z .
  • the assembly of the new hybrid bucket is as follows:
  • the insulator 3 comes to rest on the pin 7 of the blade shell at the upper end of the slot 2 when the U-shaped core is pushed into the shell 4 from above in the longitudinal direction of the blade.
  • the insulator 3 can no longer fall out.
  • Sheath 4 and core 1 are held together and pushed into the blade root 5.
  • the core 1 tapered to the tip of the jacket 4, which results in a weight saving and relief of the blade-side end of the core.
  • a baffle 9 or the like Between the jacket 4 and the core 1, a baffle 9 or the like. Element for guiding cooling air through the (not shown) wheel hub and / or turbine disc (rotor) and through the foot 5 into the intermediate space 10, which then serves as a cooling air duct and a part of the cavity 8 forms (Fig. 5).
  • the baffle 9 can also serve as radiation protection, i. H. it shields the core 1 from heat transfer from the blade casing 4.
  • the guide plate 9 does not touch the jacket 4, but is fastened, in particular soldered, at a distance from the jacket and core in the base 5 (FIG. 6).

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Description

Die Erfindung betrifft eine Hybridschaufel, insbesondere eine Leit- oder Laufschaufel einer Strömungsmaschine aus Metall-Keramik zusammengesetzt, wobei das temperaturfestere Material das außere Teil bildet. Es sind in dieser Art zusammengesetzte Schaufeln bereits bekannt aus DE-A-28 34 843 und DE-C-28 34 864.The invention relates to a hybrid blade, in particular a guide or moving blade of a turbomachine composed of metal-ceramic, the more temperature-resistant material forming the outer part. Blades composed in this way are already known from DE-A-28 34 843 and DE-C-28 34 864.

In diesen Fällen kann es im Bereich der Querstifte zu lokalen Spannungsspitzen kommen, die die Bruchgefahr erhöhen, wie sie sich bei dem bekannten Aufbau von Hybridschaufeln ergibt aus

  • a) der unterschiedlichen Wärmedehnung von keramischem Hemd und Metallkern im jeweiligen Bereich einer Anlage- oder Anlagefläche,
  • b) daß die Auflagefläche einen innen umlaufenden Wulst hat und so einen relativ kleinen Kernquerschnitt bedingt,
  • c) daß die kleine Anlagefläche sich im Keramikhemd befindet und eine genaue Bearbeitung äußerst schwierig ist.
In these cases, local stress peaks can occur in the area of the transverse pins, which increase the risk of breakage, which results from the known structure of hybrid blades
  • a) the different thermal expansion of the ceramic shirt and metal core in the respective area of a contact or contact surface,
  • b) that the contact surface has an inner circumferential bead and thus requires a relatively small core cross section,
  • c) that the small contact surface is in the ceramic shirt and precise machining is extremely difficult.

In der DE-A-3110 096 ist eine Schaufel mit den Merkmalen des Oberbegriffs von Anspruch 1 beschrieben. Ausgehend hiervon stellt sich für die Erfindung die Aufgabe, eine Schaufel zu schaffen, die die unterschiedlichen thermischen Ausdehnungskoeffizienten von metallischem Kern und keramischem Mantel - abhängig vom verwendeten Material - ausgleichen läßt, einen großen Kernquerschnitt gestattet und lokale Spannungsspitzen im keramischen Mantel vermeidet und beide leicht bearbeitbar sind.DE-A-3110 096 describes a blade with the features of the preamble of claim 1. Proceeding from this, the object of the invention is to create a blade which can compensate for the different thermal expansion coefficients of the metallic core and the ceramic jacket, depending on the material used, allows a large core cross section and avoids local stress peaks in the ceramic jacket and both are easy to machine are.

Gelöst wird diese Aufgabe durch die Merkmale des Kennzeichens von Anspruch 1.This object is achieved by the features of the characterizing part of claim 1.

Die Lösung gemäß der Erfindung besteht darin, daß der Stift (7) mit dem Schaufelmantel (4) einstückig ausgebildet ist, daß der Kern (1) so U-förmig gestaltet ist, daß er mit seinen Schenkelenden über den Stift (7) in Schaufellängsrichtung in den Schaufelfuß (5) einschiebbar ist, wonach die Basis des Kerns (1) unter Zwischenlage eines Isolators (3) auf dem Stift (7) aufliegt und die Schenkelenden des Kerns (2) im Schaufelfuß (5) unlösbar festgelegt werden.The solution according to the invention is that the pin (7) is formed in one piece with the blade casing (4), that the core (1) is designed in a U-shape so that its leg ends over the pin (7) in the longitudinal direction of the blade can be inserted into the blade root (5), after which the base of the core (1) rests on the pin (7) with the interposition of an insulator (3) and the leg ends of the core (2) are fixed in the blade root (5) so that they cannot be detached.

Der wesentliche Vorteil der Erfindung ist darin zu sehen, daß im Übergangsbereich Metall-/Keramik die Keramik druckbelastet ist. Dieser Übergangsbereich ist verhältnismäßig klein, so daß eine Wärmedehnung gefahrlos beherrschbar ist. Außerdem ist der Wärmeübergang vom Mantel auf den Kern verringert. Beide sind leicht bearbeitbar.The main advantage of the invention is that the ceramic is under pressure in the transition area from metal to ceramic. This transition area is relatively small, so that thermal expansion can be controlled safely. In addition, the heat transfer from the jacket to the core is reduced. Both are easy to edit.

Weitere Ausgestaltungen der Erfindung sind in Unteransprüchen, der Beschreibung und Zeichnung eines Ausführungsbeispiels zu entnehmen. Für den metallischen Schaufelfuß und den metallischen Kern eignen sich Superlegierungen, Nickelbasislegierungen, Titanbasislegierungen und andere.Further embodiments of the invention can be found in the subclaims, the description and the drawing of an embodiment. Super alloys, nickel-based alloys, titanium-based alloys and others are suitable for the metallic blade root and the metallic core.

Das äußere hemdartige Teil besteht aus Keramik insbesondere aus faserverstärkter Keramik wie SiC-Fasern in SiC oder SiC-Fasern in Si3N4 oder Kohlenstoffaser verstärkter Kohlenstoff mit einer Siliziumkarbidschutzschicht.The outer shirt-like part consists of ceramic, in particular of fiber-reinforced ceramic such as SiC fibers in SiC or SiC fibers in Si 3 N 4 or carbon fiber reinforced carbon with a silicon carbide protective layer.

In der beigefügten Zeichnung ist ein Ausführungsbeispiel der Erfindung rein schematisch dargestellt.In the accompanying drawing, an embodiment of the invention is shown purely schematically.

Es zeigen :

  • Fig. 1 Ansicht der neuartigen Hybridschaufel
  • Fig. 2 den Isolator als Zwischenlager
  • Fig. 3 den Kern der Hybridschaufel
  • Fig. 4 den Mantel der Hybridschaufel
  • Fig. 5 den Schaufelfuß
  • Fig. 6 einen Längsschnitt
  • Fig. 7 einen Querschnitt durch die Schaufel
Show it :
  • Fig. 1 view of the novel hybrid blade
  • Fig. 2 shows the insulator as an intermediate storage
  • Fig. 3 shows the core of the hybrid blade
  • Fig. 4 the jacket of the hybrid blade
  • Fig. 5 the blade root
  • Fig. 6 shows a longitudinal section
  • Fig. 7 shows a cross section through the blade

Der Kern hat das Bezugszeichen 1, er ist einstückig, U-förmig und von einem Schlitz 2 durchsetzt, der sich in Längsrichtung der Schaufel erstreckt und nicht über die gesamte Länge geht, wie Fig. 3 zeigt, sondern an einer Basis früher endet. Die Breite des Schlitzes ist so bemessen, daß sie den Isolator 3, dargestellt in Fig. 2, der der Verbindung zwischen Kern 1 und Mantel 4 dient, aufnehmen kann. Der Mantel 4 hat eine größere Höhe als der Kern und einen Hohlraum 8 im Zentralbereich für die Aufnahme des Kerns 1. Der Fuß ist mit 5 bezeichnet und nimmt das Hemd 4 auf in einer Ausnehmung 6. Der Mantel hat einen Stift 7, der im Schlitz 2 zu liegen kommt.The core has the reference number 1, it is in one piece, U-shaped and penetrated by a slot 2 which extends in the longitudinal direction of the blade and does not extend over the entire length, as shown in FIG. 3, but ends earlier at a base. The width of the slot is dimensioned such that it can accommodate the insulator 3, shown in FIG. 2, which serves the connection between the core 1 and the jacket 4. The jacket 4 has a greater height than the core and a cavity 8 in the central area for receiving the core 1. The foot is designated 5 and receives the shirt 4 in a recess 6. The jacket has a pin 7 in the slot 2 comes to rest.

Der Fuß 5 z.B. ein Schwalbenschwanzfuß oder ein Tannenbaumfuß nimmt auch den U-förmigen Kern 1 umgekehrt in seinem Zentrum auf. Er ist bevorzugt aus metallischem Material, gleich oder ähnlich wie der Kern 1 hergestellt, bevorzugt durch Erodieren aus Vollmaterial. Er kann auch in einem Feingußverfahren hergestellt werden.The foot 5 e.g. a dovetail foot or a fir tree foot also receives the U-shaped core 1 conversely at its center. It is preferably made of metallic material, identical or similar to the core 1, preferably by eroding from solid material. It can also be produced in an investment casting process.

Der Mantel 4 aus hochtemperaturfester Keramik wird vorzugsweise hergestellt durch Spritzguß eines sinterfähigen SiC-Materials oder Si3N4 oder durch kaltisostatisches Pressen eines Keramikpulvers in einer Form mit Kern und nachfolgender Bearbeitung des Grünlings zur Beinaheendform.The jacket 4 made of high-temperature-resistant ceramic is preferably produced by injection molding a sinterable SiC material or Si 3 N 4 or by cold isostatic pressing of a ceramic powder in a mold with a core and subsequent processing of the green compact to the almost final shape.

Der Kern 1 wird beispielsweise hergestellt durch Feinguß gewünschtenfalls ist eine Nachbearbeitung durch Schleifen möglich. Der Kern kann auch aus vollem, insbesondere metallischen Material erodiert werden oder einkristallin durch gerichtete Erstarrung im Gießverfahren hergestellt werden. Der Schlitz 2 der darin in üblicher Weise z.B. durch Fräsen hergestellt wird, wird an seinen Berührungsflächen mit dem Isolator 3 und dem Stift 7 geschliffen. Aber auch eine andere Feinbearbeitung ist anwendbar, die geeignet ist, glatte Parallelflächen zu liefern wie sie auch an dem Isolator gewünscht sind. Es soll hierdurch eine leichte Verschiebung von Mantel und Kern infolge Wärmedehnung im Betrieb ermöglicht werden. Die Parallelität der Auflageflächen zueinander sollte z. B. kleiner als 0,5 fJ.m sein. Der Isolator 3 sollte bevorzugt aus teilstabilisiertem Zirkonoxid als hochtemperaturfeste Keramik bestehen, insbesondere Y203 in ZrOz.The core 1 is produced, for example, by investment casting, if desired, post-processing by grinding is possible. The core can also be eroded from solid, in particular metallic material, or can be produced in single crystal by directional solidification in the casting process. The slot 2 which is produced in the usual way, for example by milling, is ground on its contact surfaces with the insulator 3 and the pin 7. Another fine processing can also be used, which is suitable for delivering smooth parallel surfaces, as are also desired on the insulator. This should enable a slight displacement of the jacket and core due to thermal expansion during operation. The parallelism of the contact surfaces to each other should, for. B. be less than 0.5 fJ.m. The insulator 3 should preferably consist of partially stabilized zirconium oxide as a high-temperature-resistant ceramic, in particular Y 2 0 3 in ZrO z .

Die Montage der neuen Hybridschaufel ist wie folgt :The assembly of the new hybrid bucket is as follows:

Zunächst kommt der Isolator 3 auf dem Stift 7 des Schaufelmantels am oberen Ende des Schlitzes 2 zu liegen, wenn der U-förmige Kern umgekehrt in Schaufellängsrichtung von oben in den Mantel 4 hineingeschoben wird. Der Isolator 3 kann jetzt nicht mehr herausfallen. Mantel 4 und Kern 1 werden zusammengehalten und in den Schaufelfuß 5 hineingeschoben.First, the insulator 3 comes to rest on the pin 7 of the blade shell at the upper end of the slot 2 when the U-shaped core is pushed into the shell 4 from above in the longitudinal direction of the blade. The insulator 3 can no longer fall out. Sheath 4 and core 1 are held together and pushed into the blade root 5.

Danach werden Kern 1 und Fuß 5 von der Unterseite des Fußes her miteinander fest verbunden.Then core 1 and foot 5 are firmly connected to each other from the bottom of the foot.

Es ist statt der dargestellten Ausführung auch möglich, den Kern 1 bis zur Spitze des Mantels 4 hin konisch zulaufen zu lassen, was eine Gewichtsersparnis und Entlastung des schaufelseitigen Endes des Kernes zur Folge hat. Zwischen Mantel 4 und Kern 1 kann noch ein Leitblech 9 oder dergl. Element zur Führung von Kühlluft durch die (nicht dargestellte) Radnabe und/oder Turbinenscheibe (Rotor) und durch den Fuß 5 in den Zwischenraum 10 der dann als Kühlluftkanal dient und einen Teil des Hohlraums 8 bildet (Fig. 5).Instead of the embodiment shown, it is also possible to have the core 1 tapered to the tip of the jacket 4, which results in a weight saving and relief of the blade-side end of the core. Between the jacket 4 and the core 1, a baffle 9 or the like. Element for guiding cooling air through the (not shown) wheel hub and / or turbine disc (rotor) and through the foot 5 into the intermediate space 10, which then serves as a cooling air duct and a part of the cavity 8 forms (Fig. 5).

Das Leitblech 9 kann zugleich dem Strahlungsschutz dienen, d. h. es schirmt den Kern 1 vor Wärmeübergang vom Schaufelmantel 4 ab. Das Leitblech 9 berührt den Mantel 4 nicht, sondern ist mit Abstand zu Mantel und Kern im Fuß 5 befestigt, insbesondere eingelötet (Fig. 6).The baffle 9 can also serve as radiation protection, i. H. it shields the core 1 from heat transfer from the blade casing 4. The guide plate 9 does not touch the jacket 4, but is fastened, in particular soldered, at a distance from the jacket and core in the base 5 (FIG. 6).

Claims (19)

1. Blade for turbines, with a metallic core bonded to the blade root and, surrounding but spaced apart from the root, a ceramic blade shell which is connected to the core via a ceramic pin which traverses the core, characterised in that the pin (7) is constructed in one piece with the blade shell (4) and in that the core (1) is U-shaped and in that the ends of its arms can be pushed over the pin (7) and in the longitudinal direction of the blade and into the blade jacket (4) sufficiently that the base of the core (1) rests on the pin (7) through an interposed insulator (3) while the ends of the arms of the core (2) are inseparably fixed in the blade root (5).
2. Blade according to Claim 1, characterised in that the interposed insulator is a finely- machined, particularly ground, piece, with faces parallel with the bearing faces in relation to the core or pin (for an easy sliding fit).
3. Blade according to Claim 1, characterised in that the core is soldered to the blade root.
4. Blade according to one of the preceding Claims, characterised in that the core consists of a metal or a metal alloy, a super alloy or the like.
5. Blade according to Claim 4, characterised in that the core consists of a fine casting, particularly one with an orientated setting pattern.
6. Blade according to Claim 4, characterised in that the core is monocrystalline.
7. Blade according to one of the preceding Claims, characterised in that the shroud consists of a high-temperature ceramic material such as fibre-reinforced silicon carbide or silicon nitride.
8. Blade according to Claim 7, characterised in that the shroud is produced by injection moulding.
9. Blade according to Claim 1 to 5, characterised in that the shroud is moulded from a high-temperature ceramic powder, particularly SiC or SIgN4.
10. Blade according to Claim 9, characterised in that the shroud is isostatically cold-pressed and machined while green.
11. Blade according to one of the preceding Claims, characterised in that the insulator consists of a partly stabilised zirconium oxide and has all its supporting faces ground.
12. Blade according to Claim 1, characterised in that the core is constructed to converge conically from the blade root to the blade tip.
13. Blade according to Claim 1, characterised in that there is a radiation shield between core and shell and in that this baffle does not touch the jacket.
14. Blade according to Claim 13, characterised in that cooling air can be introduced between the core and the baffle and/or the core is adapted to be cooled.
15. Blade according to Claim 14, characterised in that continuous and longitudinally directed cooling passages are disposed in the core.
16. Blade according to one of the preceding Claims, characterised in that the slot in the core, intended to accommodate the insulator and the pin of the shroud, is of greater width and of considerably greater length or depth than the insulator and the pin.
17. Blade according to one of the preceding Claims, characterised in that the pin has a rectangular cross-section and is disposed edgewise in the slot.
18. Blade according to one of the preceding Claims, characterised in that the insulator is disposed on the pin in the assembled condition with a sliding or push-type fit.
19. Blade according to one of the preceding Claims, characterised in that the insulator which can be inserted between the core and the shroud is constructed in a block shape and has a square cross-section.
EP86107927A 1985-06-19 1986-06-10 Hybrid metal-ceramic turbine vane Expired EP0206107B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3521782 1985-06-19
DE19853521782 DE3521782A1 (en) 1985-06-19 1985-06-19 HYBRID SHOVEL MADE OF METAL AND CERAMIC

Publications (3)

Publication Number Publication Date
EP0206107A2 EP0206107A2 (en) 1986-12-30
EP0206107A3 EP0206107A3 (en) 1987-04-29
EP0206107B1 true EP0206107B1 (en) 1988-08-17

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EP86107927A Expired EP0206107B1 (en) 1985-06-19 1986-06-10 Hybrid metal-ceramic turbine vane

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US (1) US4645421A (en)
EP (1) EP0206107B1 (en)
JP (1) JPS6248903A (en)
DE (2) DE3521782A1 (en)

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FR2463849A1 (en) * 1979-08-23 1981-02-27 Onera (Off Nat Aerospatiale) Blade for gas turbine rotor - has outer ceramic liner fitted over metal core and held by enlarged head and pin into rotor root fixing
US4519745A (en) * 1980-09-19 1985-05-28 Rockwell International Corporation Rotor blade and stator vane using ceramic shell
DE3110096C2 (en) * 1981-03-16 1983-05-19 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Turbine blades for gas turbine engines
DE3129304A1 (en) * 1981-07-24 1983-02-10 MTU Motoren- und Turbinen-Union München GmbH, 8000 München "TURBINE BLADE INFLUED BY HOT GAS"
DE3203869C2 (en) * 1982-02-05 1984-05-10 MTU Motoren- und Turbinen-Union München GmbH, 8000 München Turbine rotor blades for turbo machines, in particular gas turbine engines
FR2538029A1 (en) * 1982-12-15 1984-06-22 Onera (Off Nat Aerospatiale) IMPROVEMENTS TO CERAMIC, ROTATING OR FIXED BLADES OF TURBOMACHINES
DE3306896A1 (en) * 1983-02-26 1984-08-30 MTU Motoren- und Turbinen-Union München GmbH, 8000 München HOT GAS SUPPLIED TURBINE BLADE WITH METAL SUPPORT CORE AND SURROUNDING CERAMIC BLADE

Also Published As

Publication number Publication date
EP0206107A2 (en) 1986-12-30
DE3521782A1 (en) 1987-01-02
EP0206107A3 (en) 1987-04-29
JPS6248903A (en) 1987-03-03
US4645421A (en) 1987-02-24
DE3660556D1 (en) 1988-09-22

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