| 摘要 |
Aluminide coatings or layers ( 14 ) for jet engine components ( 10 ) and a process for forming aluminide layers ( 14 ) that include additions of silicon and yttrium. A superalloy substrate ( 12 ) of the component ( 10 ) is initially coated with a layer of a silicon-containing material. The substrate ( 12 ) is then aluminided, for example by a chemical vapor deposition process, and is exposed to a yttrium-containing material during the aluminiding process to form the aluminide layer ( 14 ) containing silicon and yttrium. A ceramic thermal barrier layer ( 24 ) of yttria-stabilized zirconia may be optionally applied over the aluminide layer ( 14 ). Another optional zirconia layer ( 26 ) maybe provided between the aluminide layer ( 14 ) and the ceramic thermal barrier layer ( 24 ). The present invention provides a silicon- and yttrium-containing aluminide layer ( 14 ) having improved durability, either as a standalone environmental coating or as a bond coat for a subsequently-applied ceramic thermal barrier layer ( 24 ).
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