FULLY STABILIZED ZIRCONIA IN A SEAL SYSTEM
The present invention relates to a seal system for gas turbine, the seal comprising a stator (4) and a blade (3) with a blade tip (25) facing the stator (4). The blade comprises a protective ceramic coating (21) having an inner ceramic layer (19) being made of a partially stabilized zirconia and hav...
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Main Author | |
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Format | Patent |
Language | English French German |
Published |
23.09.2020
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Subjects | |
Online Access | Get full text |
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Summary: | The present invention relates to a seal system for gas turbine, the seal comprising a stator (4) and a blade (3) with a blade tip (25) facing the stator (4). The blade comprises a protective ceramic coating (21) having an inner ceramic layer (19) being made of a partially stabilized zirconia and having at least a partially segmented microstructure in form of vertical cracks. The ceramic coating (21) further comprises an outer ceramic layer made of fully stabilized zirconia and having a segmented microstructure. Preferably, the entire airfoil surface is provided with the protective ceramic coating (21). With the fully stabilized zirconia coating on tip (25) of a blade which faces a casing with a ceramic coating (16) would results in a better sealing system. The stator (4) comprises an abradable coating (15) having at least an outer ceramic coating being made of fully stabilized or ytterbium stabilized zirconia. |
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Bibliography: | Application Number: EP20190164597 |