EP 0397731 B1 19930414 - METALLIC OBJECT, IN PARTICULAR GAS TURBINE BLADE WITH PROTECTIVE COATING
Title (en)
METALLIC OBJECT, IN PARTICULAR GAS TURBINE BLADE WITH PROTECTIVE COATING
Publication
Application
Priority
DE 3803517 A 19880205
Abstract (en)
[origin: WO8907159A1] The present invention concerns multi layer protective coatings for metallic objects (1), in particular gas turbine blades. Given the existence of two different corrosion mecanisms which determine the service life of such objects, two superimposed protective layers are applied. The inner layer (2) protects against attacks by corrosion at temperatures between 600 DEG C and 800 DEG C (HCTII), and the outer layer (3) affords optimal protection againt corrosion at temperatures between 800 DEG C and 900 DEG C (HTCI). In addition, an outermost coating layer forming a thermal barrier (6) can be provided. The first coating layer (2) is preferably a diffusion layer with a chromium content greater than 50 % and an iron and/or manganese content greater than 10 %, and the second coating layer (3) is preferably a MCrAlY layer, containing for example approximately 75 % chromium, approximately 7 % aluminium and approximately 0,7 % yttrium, applied by low-pressure plasma spraying.
IPC 1-7
IPC 8 full level
F01D 5/28 (2006.01); C22C 27/06 (2006.01); C22C 30/00 (2006.01); C23C 4/06 (2016.01); C23C 28/02 (2006.01)
CPC (source: EP)
C23C 28/023 (2013.01)
Designated contracting state (EPC)
CH DE FR GB IT LI SE
DOCDB simple family (publication)
WO 8907159 A1 19890810; DE 58904084 D1 19930519; EP 0397731 A1 19901122; EP 0397731 B1 19930414; IN 171444 B 19921017; JP H03503184 A 19910718
DOCDB simple family (application)
DE 8900023 W 19890119; DE 58904084 T 19890119; EP 89901530 A 19890119; IN 91CA1989 A 19890130; JP 50138989 A 19890119