High temperature use of a self lubricating coating material in a foil bearing and part coated with such a material

Abstract

High temperature use of a self lubricating coating material in a foil bearing and part coated with such a material. A material according to the disclosure includes between 50 and 90 wt % of alumina (Al2O3), as well as an oxide selected from the group consisting of titanium oxide (TiO2), chromium oxide (Cr2O3), and a mixture of these. Application to a rotor and/or a thrust disc at least partially covered with such a material.

1 . Use of a coating comprising between 50 and 90 wt % of alumina (Al 2 O 3 ) and an oxide selected from the group consisting of: titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), and a mixture of thereof, as a self-lubricating coating for the high-temperature use of a rotor in a foil bearing. 
     
     
         2 . The use of a coating according to  claim 1 , wherein the coating consists of a mixture of 50 to 90 wt % of alumina (Al 2 O 3 ) with an oxide selected from the group consisting of: titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), and a mixture thereof. 
     
     
         3 . The use of a coating according to  claim 2 , wherein the coating consists of a mixture of alumina (Al 2 O 3 ) and titanium oxide (TiO 2 ). 
     
     
         4 . The use of a coating according to  claim 1 , wherein the coating comprises between 65 and 75 wt % of alumina (Al 2 O 3 ). 
     
     
         5 . Turbomachine part comprising a circular cylindrical bearing, wherein said bearing is at least partially coated with a self-lubricating coating comprising between 50 and 90 wt % of alumina (Al 2 O 3 ) as well as an oxide selected from the group consisting of: titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), and a mixture thereof. 
     
     
         6 . The turbomachine part according to  claim 5 , wherein said self-lubricating coating is deposited by an air plasma spraying process, the coated surface then being ground. 
     
     
         7 . The turbomachine part according to  claim 5 , selected from the group of parts consisting of: rotors and thrust discs. 
     
     
         8 . Turbomachine comprising a turbomachine part according to  claim 5 . 
     
     
         9 . The turbomachine according to  claim 8 , comprising a foil-air bearing having a housing which accommodates, on the one hand, a circular cylindrical portion of a turbomachine part, said circular cylindrical portion being at least partially coated with a self-lubricating coating comprising between 50 and 90 wt % of alumina (Al 2 O 3 ) and an oxide selected from the group consisting of: titanium oxide (TiO 2 ), chromium oxide (Cr 2 O 3 ), and a mixture thereof, and on the other hand at least one foil, called the top foil, coming to face said circular cylindrical portion, said top foil being untreated. 
     
     
         10 . Air conditioning device, wherein said air conditioning device comprises a turbomachine according to  claim 8 .