Claims
- 1. In a heat insulation, ceramic layer having an outer surface with microcracks therein applied on a metal structural part, the improvement consisting essentially of a passivating material applied as a coating only on exposed surfaces of the heat insulation ceramic layer at said microcracks.
- 2. The improvement as claimed in claim 1, wherein said passivating material comprises a metal.
- 3. The improvement as claimed in claim 2, wherein said metal is selected from the group consisting of Ni, Co, Cr, Al, Pt, Au and mixtures thereof.
- 4. The improvement as claimed in claim 1, wherein said passivating material comprises a ceramic material.
- 5. The improvement as claimed in claim 4, wherein said ceramic material is cerium oxide or stabilized zirconium oxide.
- 6. The improvement as claimed in claim 1, wherein said metal structural part is a component of a gas turbine and said heat insulation layer provides resistance to hot gases in said gas turbine.
- 7. The improvement as claimed in claim 6, wherein said component is part of a gas turbine engine.
- 8. The improvement as claimed in claim 1, wherein said coating of passivating material consists essentially of nanocrystals of ceramic material attached by capillary forces at the exposed surfaces of said microcracks.
- 9. The improvement as claimed in claim 8, wherein said coating of ceramic material is obtained by impregnating the heat insulation layer with a dispersion of said nanocrystals in liquid phase, said nanocryatals attaching by capillarity, to said heat insulation layer, said liquid phase being vaporized to leave said coating of nanocrystals of ceramic material on the microcrack surfaces.
- 10. The improvement as claimed in claim 1, wherein said coating of passivating material consists of an electrolytically deposited metal.
- 11. The improvement as claimed in claim 1, wherein said passivating material has a microcrystalline structure which provides low surface tension in solutions or dispersions thereof.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 03 135.8 |
Feb 1993 |
DEX |
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Parent Case Info
This application is a continuation of Ser. No. 08/191,273 filed on Feb. 3,1994, now abandoned.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0075228 |
Mar 1983 |
EPX |
75228 |
Mar 1983 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
191273 |
Feb 1994 |
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