Claims
- 1. A process for producing a heat insulation, ceramic layer on a metal structural part, comprising:
- depositing a material containing zirconium oxide onto a metal structural part to form a heat insulation layer on said metal part, said heat insulation layer having an open, inner structure, and
- impregnating said heat insulation layer with a liquid containing a passivating agent of ceramic nanocrystalline particles to form a passivating coating of said ceramic particle on surfaces of said open, inner structure of said heat insulation layer, and
- wherein said ceramic particles of said passivating coating infiltrate and are confined in said inner structure of said heat insulation layer.
- 2. A process as claimed in claim 1, wherein said liquid containing the ceramic particles of the passivating agent is impregnated into said heat insulation layer after which a heating step is carried out to vaporize the liquid leaving only the ceramic particles on the surfaces of the open inner structure of said heat insulation layer.
- 3. A process as claimed in claim 2, wherein said ceramic particles are ceramic oxide and said heating step is carried out at 500.degree. C.
- 4. A process a claimed in claim 1, wherein said passivating, ceramic, nanocrystalline particles are selected from the group consisting of cerium oxide and zirconium oxide.
- 5. A process for producing a heat insulation, ceramic layer on a metal structural part, comprising:
- depositing a material containing zirconium oxide onto a metal structural part to form a heat insulation layer on said metal part, said heat insulation layer having an open, inner structure
- impregnating said heat insulation layer with a liquid containing a passivating agent of platinum to form a passivating platinum coating on surfaces of said open, inner structure of said heat insulation layer, and
- heat treating said insulation layer and the metal structural part.
- 6. A process as claimed in claim 5, wherein after said liquid containing the passivating platinum agent is impregnated into said heat insulation layer, a heating step is carried out to leave pure platinum on said surfaces of said inner structure of said heat insulation layer.
- 7. A process as claimed in claim 6, wherein said heating step is carried out at 500.degree. C.
- 8. A process as claimed in claim 5, comprising applying said metal to impregnate said heat insulation layer as an aqueous or organic solution of platinum.
- 9. A process as claimed in claim 5, comprising applying said metal to impregnate said heat insulation layer electrolytically by cathodic reduction.
- 10. A process as claimed in claim 9, comprising controlling deposition of the platinum to a region of the heat insulation layer proximate an interface between the heat insulation layer and the metal structural part by controlling time of electrolysis.
Priority Claims (1)
Number |
Date |
Country |
Kind |
43 03 135.8 |
Feb 1993 |
DEX |
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Parent Case Info
This is a divisional of copending application(s) Ser. No. 08/191,273 filed on Feb. 3, 1994.
US Referenced Citations (16)
Foreign Referenced Citations (2)
Number |
Date |
Country |
0075228 |
Mar 1983 |
EPX |
75228 |
Mar 1983 |
JPX |
Divisions (1)
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Number |
Date |
Country |
Parent |
191273 |
Feb 1994 |
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