Stock material or miscellaneous articles – Composite – Of metal
Reexamination Certificate
2008-05-20
2008-05-20
McNeil, Jennifer (Department: 1794)
Stock material or miscellaneous articles
Composite
Of metal
C428S472000, C428S701000, C428S702000, C501S103000
Reexamination Certificate
active
07374821
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.
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S. Raghavan, et al., “Thermal Properties of Zirconia Co-Doped with Trivalent and Pentavalent Oxides”, Acta mater, vol. 49, No. 1, XP-02275560, Jan. 8, 2001, pp. 169-179.
Dae-Joon Kim, et al., “Phase Stability and Physical Properties of Cubic and Tetragonal ZrO2in the System ZrO2-Y2O3-Ta2O5”, Journal of the American Ceramic Society, vol. 74, No. 12, XP-002275561, Dec. 1991, pp. 3061-3065.
Bérangére Leclercq, et al., “Thermal Conductivity of Zirconia-Based Ceramics for Thermal Barrier Coatings”, CIMTEC 2002-10thInternational Ceramics Congress and 3rdForum on New Materials 10thInternational Ceramics Congress-Part C, Advances in Science and Technology, XP-008029240, 2003, pp. 365-372.
Patent Abstracts of Japan, JP 2001-348655, Dec. 18, 2001.
Azzopardi Alban
Leclercq Bérangère
Malie André
Mevrel Remy
Saint-Ramond Bertrand
McNeil Jennifer
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
SNECMA
SNECMA Services
Speer Timothy M
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