Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board
Patent
1982-09-30
1984-02-07
Newsome, John H.
Coating processes
Electrical product produced
Integrated circuit, printed circuit, or circuit board
415174, 427 531, 427423, 428155, B05D 108
Patent
active
044303602
ABSTRACT:
This invention is directed to improving the thermal shock resistance of a ceramic layer. The invention is particularly directed to an improved abradable lining (16) that is deposited on a shroud (14) forming a gas-path seal in turbomachinery.
Improved thermal shock resistance of a shroud is effected through the deliberate introduction of "benign" cracks. These are microcracks which will not propagate appreciably upon exposure to the thermal shock environment in which a turbine seal must function.
Laser surface fusion treatment is used to introduce these microcracks. The ceramic surface is laser scanned to form a continuous dense layer as shown in FIG. 2. As this layer cools and solidifies, shrinkage results in the formation of a very fine crack network.
The presence of this deliberately introduced fine crack network precludes the formation of a catastrophic crack during thermal shock exposure.
REFERENCES:
patent: 2357399 (1944-09-01), Gregory
patent: 3953636 (1976-04-01), Kirchner
patent: 4004042 (1977-01-01), Fairbairn
patent: 4024617 (1977-05-01), McCormick
patent: 4103002 (1978-07-01), Hench et al.
patent: 4145481 (1979-03-01), Gupta et al.
patent: 4248940 (1981-02-01), Goward et al.
patent: 4299865 (1981-11-01), Clingman et al.
Sumner et al., "AIAA/SAE/ASME 16th Joint Propulsion Conference", American Inst. of Aeronautics and Astronautics, Jun. 30-Jul. 2, 1980.
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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