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Vacuum plasma spray coatingCurrently, protective plasma spray coatings are applied to space shuttle main engine turbine blades of high-performance nickel alloys by an air plasma spray process. Originally, a ceramic coating of yttria-stabilized zirconia (ZrO2.12Y2O3) was applied for thermal protection, but was removed because of severe spalling. In vacuum plasma spray coating, plasma coatings of nickel-chromium-aluminum-yttrium (NiCrAlY) are applied in a reduced atmosphere of argon/helium. These enhanced coatings showed no spalling after 40 MSFC burner rig thermal shock cycles between 927 C (1700 F) and -253 C (-423 F), while current coatings spalled during 5 to 25 test cycles. Subsequently, a process was developed for applying a durable thermal barrier coating of ZrO2.8Y2O3 to the turbine blades of first-stage high-pressure fuel turbopumps utilizing the enhanced NiCrAlY bond-coating process. NiCrAlY bond coating is applied first, with ZrO2.8Y2O3 added sequentially in increasing amounts until a thermal barrier coating is obtained. The enchanced thermal barrier coating has successfully passed 40 burner rig thermal shock cycles.
Document ID
19890013299
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Holmes, Richard R.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Mckechnie, Timothy N.
(Rockwell International Corp. Huntsville, AL., United States)
Date Acquired
September 5, 2013
Publication Date
March 1, 1989
Publication Information
Publication: AGARD, Application of Advanced Material for Turbomachinery and Rocket Propulsion
Subject Category
Nonmetallic Materials
Accession Number
89N22670
Distribution Limits
Public
Copyright
Other
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