Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Erodable or permanently deformable
Patent
1981-03-11
1983-03-22
Coe, Philip R.
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Erodable or permanently deformable
415197, F01D 1108
Patent
active
043773710
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.
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Bill Robert C.
Wisander Donald W.
Coe Philip R.
Manning John R.
Musial Norman T.
Shook Gene E.
Stinson Frankie L.
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