High temperature intermetallic binders for HVOF carbides

Conference · Sat Dec 31 00:00:00 EST 1994

OSTI ID:160445

Shaw, K G ^[1]; Gruninger, M F; Jarosinski, W J ^[2]

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1. Xform, Inc., Cohoes, NY (United States)
2. Praxair Specialty Powders, Indianapolis, IN (United States)

Gas turbines technology has a long history of employing the desirable high temperature physical attributes of ceramic-metallic (cermet) materials. The most commonly used coatings incorporate combinations of WC-Co and Cr{sub 3}C{sub 2}-NiCr, which have also been successfully utilized in other non-turbine coating applications. Increased turbine operating temperatures and other high temperature service conditions have made apparent the attractive notion of increasing the temperature capability and corrosion resistance of these coatings. In this study the intermetallic binder NiAl has been used to replace the cobalt and NiCr constituents of conventional WC and Cr{sub 3}C{sub 2} cermet powders. The composite carbide thermal spray powders were fabricated for use in the HVOF coating process. The structure of HVOF deposited NiAl-carbide coatings are compared directly to the more familiar WC-Co and Cr{sub 3}C{sub 2}-NiCr coatings using X-ray diffraction, back-scattered electron imaging (BEI) and electron dispersive spectroscopy (EDS). Hardness variations with temperature are reported and compared between the NiAl and Co/NiCr binders.

• OSTI ID: 160445
• Report Number(s): CONF-940684-; ISBN 0-87170-509-5; TRN: 96:006018
• Resource Relation: Conference: 1994 national thermal spray conference, Boston, MA (United States), 20-24 Jun 1994; Other Information: PBD: 1994; Related Information: Is Part Of 1994 Thermal spray industrial applications: Proceedings; Berndt, C.C.; Sampath, S. [eds.] [State Univ. of New York, Stony Brook, NY (United States). Dept. of Materials Science and Engineering]; PB: 816 p.
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
20 FOSSIL-FUELED POWER PLANTS
CERMETS
FLAME SPRAYING
MICROSTRUCTURE
MECHANICAL PROPERTIES
NICKEL ALLOYS
ALUMINIUM ALLOYS
CHROMIUM CARBIDES
TUNGSTEN CARBIDES
GAS TURBINES
PROTECTIVE COATINGS
INTERMETALLIC COMPOUNDS
POWDERS
SOLUBILITY
X-RAY DIFFRACTION
BACKSCATTERING
ELECTRON SPECTROSCOPY
HARDNESS