Compositions: ceramic – Ceramic compositions – Pore-forming
Patent
1996-11-08
1998-06-02
Lesmes, George F.
Compositions: ceramic
Ceramic compositions
Pore-forming
501 80, 501103, 501102, 10628719, 428699, 428689, 523218, 523219, 521154, C04B 3806, C04B 3548
Patent
active
057599327
ABSTRACT:
An improved thermal barrier coating for metal substrates such as superalloys is provided. The coating is a slurry composition, comprising spheres of zirconia, at least some of which are hollow, contained within a porous oxide matrix, such as aluminosilicate. The slurry composition can be applied by slurry casting or similar techniques to the desired surface. Coating methods involve the application of successive layers of variations of the slurry composition, with various curing techniques used between layers and after the final coating is applied. Another embodiment of this invention embraces a composite coating, comprising (i) an oxide matrix phase; (ii) zirconia spheres embedded in the oxide matrix; and (iii) a porous phase.
REFERENCES:
patent: 4450184 (1984-05-01), Longo et al.
patent: 5514482 (1996-05-01), Strangman
1853400 NTIS Accession Number: N95-26133/5/XAB "Thermal Conductivity of Zirconia Thermal Barrier Coatings"(Abstract)--Oak Ridge National Lab, TN. Mar. 95--(2 Sheets).
1753380 NTIS Accession Number: DE94000746/XAB--"Thin-Wall Hollow Ceramic Spheres from Slurries". Quarterly Project Status report, 1 Jan. --33 Mar., 1991.
03846965--EDB 95-090733 "Thermal Conductivity of Zirconia Thermal Barrier Coatings", Dinwiddie, R.B., Beecher, S.C., Nagaraj, B.A., Moore, C.S.--Mar. 1995.
"Ceramic Slurry Coatings for Advanced Heat Engines" by L. Kamo, M. Greathouse and R. Kamo, Proceedings of the International Thermal Spray Conf. & Exposition, Orlando, Florida, 28 May-5 Jun. 1992, pp. 45-49.
"ORNL Finds Spheres Could Make a Good Insulation"--Oak Ridge National Laboratory Review, vol. 23, Number one 1990-89-92 pps.
McAtee Daniel Scott
Nagaraj Bangalore Aswatha
Sangeeta D.
Spiro Clifford Lawrence
Szala Lawrence Edward
General Electric Company
Johnson Noreen C.
Juska Cheryl
Lesmes George F.
Stoner Douglas E.
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