Thermal barrier composition, a superalloy machine part provided with a coating having such a composition, a ceramic coating, and a method of fabricating the coating
a technology of composition and composition, which is applied in the direction of superimposed coating process, machines/engines, and efficient propulsion technologies, etc., can solve the problems of significant delamination between the coating and the substrate, and achieve the effect of reducing the thermal conductivity of the zirconia
Inactive Publication Date: 2008-03-20
SN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A
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Benefits of technology
The composition achieves a balance of low thermal conductivity and high high-temperature strength, allowing machine parts to operate effectively between 1100°C and 1500°C with improved thermal cycling resistance and reduced thermal conductivity, thereby enhancing the lifespan and efficiency of turbomachines.
Problems solved by technology
Usually, it is found that thermal barriers which give rise to a significant discontinuity in thermal conductivity run the risk of significant delamination between the coating and the substrate, or more precisely at the interface between the underlayer and the ceramic thermal barrier.
Method used
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[0045] The machine part shown in FIG. 1 comprises a thermal barrier coating 11 deposited on a substrate 12 of superalloy, such as superalloy based on nickel and / or cobalt. The thermal barrier coating 11 comprises a metal underlayer 13 deposited on the substrate 12, and a ceramic layer 14 of composition in accordance with the invention, deposited on the underlayer 13.
[0046] The underlayer 13 may be an alumina-forming alloy that withstand oxygen corrosion, such as an alloy suitable for forming a protective layer of alumina by oxidation, an alloy of the MCrAlY type (M being a metal selected from nickel, cobalt, iron, or a mixture of said metals), or a nickel or cobalt aluminide optionally modified by adding a metal selected from platinum, chromium, palladium, ruthenium, iridium, osmium, rhodium, or a mixture of these metals and / or a reactive element selected from zirconium (Zr), hafnium (Hf), and yttrium (Y).
[0047] The ceramic layer 14 is constituted by a zirconia base, a trivalent o...
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Abstract
The invention relates to a ceramic thermal barrier composition of low conductivity and high high-temperature strength. In characteristic manner, the composition comprises a zirconia base, at least one trivalent oxide enabling the zirconia to be stabilized and enabling the thermal conductivity of the zirconia to be reduced in optimum manner, and at least one pentavalent oxide enabling the content of oxygen vacancies to be reduced so as to make it substantially equal to that of a partially stabilized zirconia. Preferably, said trivalent oxide is present with a molar content constituted by a first portion enabling the zirconia to be stabilized partially and a second portion which introduces point defects into the lattice said pentavalent oxide is present with a molar concentration equal to said molar concentration of said second portion of the trivalent oxide. The invention is applicable to making a superalloy machine part having a ceramic coating with said composition, and possibly also a bonding underlayer.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is a division of and claims the benefit of priority under 35 U.S.C. §120 from U.S. Ser. No. 10 / 911,598 filed Aug. 5, 2004, and claims the benefit of priority under 35 U.S.C. §119 from French Patent Application No. 03 09743 filed Aug. 7, 2003, the entire contents of each of which are incorporated herein by reference. [0002] The invention relates to a thermal barrier composition having low thermal conductivity, to a machine part made of superalloy and protected by a ceramic coating having such a composition, to said ceramic coating, and to a method of fabricating the ceramic coating.BACKGROUND OF THE INVENTION [0003] Efforts to increase the efficiency of turbomachines, in particular in the field of aviation, and to reduce fuel consumption and emissions of polluting gases and unburned fuel have led to a move towards stoichiometric mixtures for fuel combustion. This situation is accompanied by an increase in the temperature...
Claims
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IPC IPC(8): B05D1/36C04B35/486C23C4/02C23C4/10C23C4/11C23C8/10C23C28/00C23C30/00F01D5/28F02C7/00
CPCC04B35/486C23C4/02C23C28/321C23C28/3215C23C28/3455C23C30/00Y10T428/12618Y02T50/67Y02T50/671F05D2230/90F05D2300/611F05D2300/2118F01D5/288Y02T50/60
InventorLECLERCQ, BERANGEREMEVREL, REMYAZZOPARDI, ALBANMALIE, ANDRESAINT-RAMOND, BERTRAND
OwnerSN DETUDE & DE CONSTR DE MOTEURS DAVIATION S N E C M A