Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1980-03-30
1982-06-22
Newsome, John H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
415174, 427423, B05D 108
Patent
active
043362761
ABSTRACT:
This invention is concerned with a seal having a high temperature abradable lining material encircling the tips of turbine blades in turbomachinery. The invention is particularly directed to maintaining the minimum operating clearances between the blade tips and the lining of a high pressure turbine.
A low temperature easily decomposable material, such as a polymer, in powder form is blended with a high temperature oxidation resistant metal powder. The two materials are simultaneously deposited on a substrate formed by the turbine casing. Alternately, the polymerpowder may be added to the metal powder during plasma spraying.
A ceramic layer is then deposited directly onto the metal-polymer composite. The polymer additive mixed with the metal is then completely volatilized to provide a porous layer between the ceramic layer and the substrate.
Thermal stresses are reduced by virtue of the resulting porous structure which affords a cushion effect. By using only plasma spraying for depositing both the powders of the metal and polymer material, as well as the ceramic powder, no brazing is required.
REFERENCES:
patent: 3817719 (1974-06-01), Schilke et al.
patent: 3834001 (1974-09-01), Carroll et al.
patent: 3879831 (1975-04-01), Rigney et al.
patent: 3880550 (1975-04-01), Corey et al.
patent: 3975165 (1976-08-01), Elbert et al.
patent: 4080204 (1978-03-01), Panzera
patent: 4135851 (1979-01-01), Bill et al.
patent: 4207024 (1980-06-01), Bill et al.
patent: 4247249 (1981-01-01), Siemers
patent: 4251272 (1981-02-01), Sara
patent: 4273824 (1981-06-01), McComas et al.
Bill Robert C.
Wisander Donald W.
Manning John R.
Musial Norman T.
Newsome John H.
Shook Gene E.
The United States of America as represented by the Administrator
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