The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 20, 2008
Filed:
Aug. 05, 2004
Bérangère Leclercq, Villejuif, FR;
Rémy Mevrel, Le Plessis Robinson, FR;
Alban Azzopardi, Paris, FR;
André Malie, Chatellerault, FR;
Bertrand Saint-ramond, Fontainebleau, FR;
Bérangère Leclercq, Villejuif, FR;
Rémy Mevrel, Le Plessis Robinson, FR;
Alban Azzopardi, Paris, FR;
André Malie, Chatellerault, FR;
Bertrand Saint-Ramond, Fontainebleau, FR;
Snecma, Paris, FR;
Snecma Services, Paris, FR;
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.