| 摘要 |
An abradable coating system (2-8) for a turbine or a compressor is proposed has at least one layer of woven or non-woven tissue (15) or foam made of: ceramic, glass, glass-ceramic, ceramic-metal composite and combinations thereof. A free-standing preformed element (18) has at least one layer of such a woven or non-woven tissue or foam is filled with fillers and/or binder. A method prepares such a system. Finally, a method for the repair of an abradable coating portion of a turbine or the compressor component (9) includes in a first optional step that the damaged portion is at least partly removed and/or cleaned and/or surface treated, and in a second step at least one free-standing preformed abradable coating element (18) or a complete abradable coating system is attached to the component (9), preferably by using a matrix, wherein for example only a center part (2) or a fraction of a center part (2) is replaced. |
| 主权项 |
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. |
