View Single Post

Old 01-28-2010, 12:12 PM
sim000 sim000 is offline
Junior Member
Join Date: Jan 2010
Location: u.k
Posts: 8

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.
Reply With Quote