Milton V Ortiz

US Patent:

6582779, Jun 24, 2003

Filed:

Aug 11, 1999

Appl. No.:

09/371826

Inventors:

Chien-Wei Li - Livingston NJ
Derek Raybould - Denville NJ
Milton Ortiz - Scottsdale AZ
Thomas Edward Strangman - Phoenix AZ

Assignee:

AlliedSignal, Inc. - Morristown NJ

International Classification:

C23C 1430

US Classification:

427585, 427596, 42725531, 4273762, 427377, 427427, 427429

Abstract:

A turbomachine component includes a silicon nitride substrate and a multi-layer coating bonded to the substrate. The coating includes an interlayer of porous fibrous silicon nitride having a density of between 85-98%. The coating also includes an outer layer formed of an oxide compound, preferably tantalum oxide, that is applied by Electron Beam-Physical Vapor Deposition. The combination of the silicon nitride interlayer and tantalum oxide outer layer serves to protect the substrate from the adverse affects of oxidation, impact by foreign objects and extreme operating temperatures.