Method of application of a protective coating to a substrate
AssigneeLiburdi Engineering Limited
InventorsVladimir Moravek, Paul Lowden, Joseph Liburdi
Life of this patent
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Abstract
A process of coating a refractory turbine part with a protective coating which is ultimately diffusion bonded to the part. A slurry coating material is prepared from a mixture of a silicon alkyd paint and suspended particles of an aluminum or aluminum alloy powder. Parts may be dipped in the slurry and subsequently be heat treated in selected atmospheres and temperatures to diffuse the coating into the surface of the part.
Claims8
A process of coating a turbine part which is subjected to high temperature operation during its life comprising:
- cleaning a surface of the part;
- coating said cleaned surface of said part with a slurry containing finely divided aluminum and/or aluminum alloy particles, the particles having a particle size of about −350 mesh;
- said slurry having a carrier of a silicone alkyd high heat aluminum paint, the mass ratio of paint to powder being about 1:1;
- allowing the surface of said part coated with said slurry to air cure;
- and
- heat treating the air-cured coated surface of said part to partially form a diffused coating on said surface of said part in the presence of an inert gas at about 840° C.
A process of coating a turbine part which is subjected to high temperature operation during its life comprising:
- cleaning a surface of the part according to known techniques,
- coating said cleaned surface of said part with a slurry containing finely divided aluminum and/or aluminum alloy particles,
- said slurry having a carrier of a commercially available silicone alkyd paint;
- allowing the surface of said part coated with said slurry to air cure sufficiently;
- heat treating the air-cured coated surface of said part to partially form a diffused coating on said surface of said part in the presence of an inert gas at about 840° C.;
- and
- heat treating in a vacuum furnace the partially treated surface of said part for a predetermined time to diffuse-bond the coating to said surface of said part at a temperature of about 1080° C.
Dependencies are inferred from the claim text.