Fabrication of composite spray powders using reaction synthesis

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

OSTI ID:160494

Shaw, K G; McCoy, K P ^[1]; Trogolo, J A ^[2]

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1. Xform, Inc., Cohoes, NY (United States)
2. Niche Microstructural Corp., Troy, NY (United States)

Intermetallic composite powders including up to 30 volume percent ceramic reinforcing phase have been fabricated without using binders by reaction synthesis. The mechanics of the process are discussed as related to the necessary reaction ignition condition. A detailed mechanism of the reaction and incorporation of the reinforcing phase is presented based on electron microscopy and thermodynamic calculations. The structure of NiAl-Al{sub 2}O{sub 3} composite powders and plasma sprayed coatings are reported. it is shown that uniform lamellar intermetallic composites with sub-micrometer features may be formed by spraying these powders using a single gun geometry. These materials may be useful in the formation of functionally gradient intermetallic-ceramic structures.

• OSTI ID: 160494
• Report Number(s): CONF-940684-; ISBN 0-87170-509-5; TRN: IM9603%%76
• 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
40 CHEMISTRY
COMPOSITE MATERIALS
CHEMICAL PREPARATION
PLASMA ARC SPRAYING
MICROSTRUCTURE
ALUMINIUM OXIDES
NICKEL ALLOYS
ALUMINIUM ALLOYS
INTERMETALLIC COMPOUNDS
POWDERS
REACTION KINETICS
LIQUID METALS
PARTICLE SIZE
TEMPERATURE DEPENDENCE
HEAT TRANSFER
MILLING
ARGON
MORPHOLOGY
LAMELLAE
SCANNING ELECTRON MICROSCOPY