Snecma Moteurs

Snecma

Bertrand Saint Ramond

John Nicholls

Manuel Silva

Maxime Carlin

A gas turbine part comprises a superalloy metal substrate, a bonding underlayer formed on the substrate and comprising an intermetallic compound of aluminum, nickel, and platinum, and a ceramic outer layer anchored on the alumina film formed on the bonding underlayer. The bonding underlayer essentially comprises an Ni&#x2014;Pt&#x2014;Al ternary system constituted by an aluminum-enriched &#x3b1;-NiPt type structure, in particular an Ni&#x2014;Pt&#x2014;Al ternary system having a composition NiPtAlin which z, y, and x are such that 0.05&#x2266;z&#x2266;0.40, 0.30&#x2266;y&#x2266;0.60, and 0.15&#x2266;x&#x2266;0.40.

Gas turbine part provided with a protective coating

A protective coating forming a thermal barrier is made on a superalloy metal substrate by forming a bonding underlayer on the substrate, the bonding underlayer being constituted by an intermetallic compound comprising at least aluminum and a metal from the platinum group, and by forming a ceramic outer layer which is anchored on a film of alumina present on the surface of the bonding underlayer. The bonding underlayer preferably has a thickness of less than 50 &#x3bc;m and is made by using physical vapor deposition, e.g. by cathode sputtering, to deposit a plurality of individual layers alternately of aluminum and of a metal from the platinum group, and by causing the metals in the resulting layers to react together exothermally.

Method of making a protective coating forming a thermal barrier with a bonding underlayer on a superalloy substrate, and a part obtained thereby

A protective coating forming a thermal barrier is made on a superalloy metal substrate by forming a bonding underlayer on the substrate, the bonding underlayer being constituted by an intermetallic compound comprising at least aluminum and a metal from the platinum group, and by forming a ceramic outer layer which is anchored on a film of alumina present on the surface of the bonding underlayer. The bonding underlayer preferably has a thickness of less than 50 &mgr;m and is made by using physical vapor deposition, e.g. by cathode sputtering, to deposit a plurality of individual layers alternately of aluminum and of a metal from the platinum group, and by causing the metals in the resulting layers to react together exothermally.

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Fontainebleau, France

Bertrand Saint Ramond