US 12,460,554 B2
Fully stabilized zirconia in a seal system
Dimitrios Zois, Berlin (DE)
Assigned to Siemens Energy Global GmbH & Co. KG, Bayern (DE)
Appl. No. 17/437,551
Filed by Siemens Energy Global GmbH & Co. KG, Bayern (DE)
PCT Filed Feb. 25, 2020, PCT No. PCT/EP2020/054898
§ 371(c)(1), (2) Date Sep. 9, 2021,
PCT Pub. No. WO2020/193043, PCT Pub. Date Oct. 1, 2020.
Claims priority of application No. 19164597 (EP), filed on Mar. 22, 2019.
Prior Publication US 2022/0154592 A1, May 19, 2022
Int. Cl. F01D 11/12 (2006.01); F01D 5/28 (2006.01); F01D 11/08 (2006.01); F01D 25/00 (2006.01)
CPC F01D 11/122 (2013.01) [F01D 5/284 (2013.01); F01D 5/288 (2013.01); F01D 11/08 (2013.01); F01D 11/12 (2013.01); F01D 25/005 (2013.01); F05D 2300/21 (2013.01); F05D 2300/2118 (2013.01); F05D 2300/514 (2013.01); F05D 2300/6033 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A seal system, comprising:
a casing, and
a blade,
wherein the casing comprises a first ceramic coating, which faces a tip of the blade, wherein the first ceramic coating comprises: a first inner ceramic coating that is applied directly to the casing and that is made of Partially Stabilized Zirconia (PSZ); and a first outer ceramic coating that is an outermost layer, that is applied directly to the first inner ceramic coating and that is made of Fully Stabilized Zirconia (FSZ) or Ytterbia stabilized Zirconia (YBZO),
wherein the blade, which faces the casing or the first ceramic coating of the casing, comprises on the tip of the blade a second ceramic coating comprising: a second inner ceramic coating comprising an at least partially segmented microstructure and a minimum thickness of 125 μm made of PSZ, and a second outer ceramic coating comprising a segmented microstructure made of FSZ,
wherein the first outer ceramic coating comprises a greater porosity than the first inner ceramic coating, and
wherein the second ceramic coating is an abrasive coating configured to act as a seal between the blade and the casing, and wherein the first ceramic coating is an abradable coating configured to be abraded by the second ceramic coating.