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Abradable coating system

  • US 8,821,116 B2
  • Filed: 10/29/2010
  • Issued: 09/02/2014
  • Est. Priority Date: 10/30/2009
  • Status: Active Grant
First Claim
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1. An abradable coating system for clearance reduction in a turbine or a compressor, the turbine or compressor defining an axis of rotation and having blading and a component on which said system can be applied, the system comprising:

  • at least one block, wherein the block comprises;

    a woven or non-woven tissue or foam made of a material selected from the group consisting of ceramic, glass, glass-ceramic, ceramic-metal composite, and combinations thereof, andfiller particles, filler fibers, an inorganic polymer binder, or combinations thereof, at least partially filling the tissue or foam;

    a center part, wherein at least the center part of the system has an abradability which is graded along a radial direction with respect to the axis of rotation, such that the surface region of a side facing the blading is more abradable than an opposite side facing the component, wherein the center part is stripe-like and circumferentially oriented, wherein the center part is highly abradable such that it can be abraded by the blading;

    a pair of stripe-like, circumferentially oriented side parts immediately axially adjacent to the center part, wherein the side parts are less abradable than the center part; and

    wherein an abradable differentiation between the center part and the side parts is achieved by using a different impregnation matrix material for the center part and the side parts.

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