Radio-frequency plasma spraying of ceramics

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb06040.x· OSTI ID:7008611

Okada, T; Hamatani, H; Yoshida, T ^[1]

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1. Dept. of Metallurgy and Materials Science, Faculty of Engineering, The Univ. of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113 (JP)

This study was aimed at developing a novel spraying process using a radio-frequency (rf) plasma. Experiments of Al{sub 2}O{sub 3} and ZrO{sub 2} {minus} 8 wt% Y{sub 2}O{sub 3} spraying showed that the initial powder size was the most important parameter for depositing dense coatings. The optimum powder sizes of Al{sub 2}O{sub 3} and ZrO{sub 2} {minus} 8 wt% Y{sub 2}O{sub 3} were considered to be around 100 and 80 {mu}m, respectively. The use of such large-size powders compared with those used by conventional dc plasma spraying made it possible to deposit adherent ceramics coatings of 150 to 300 {mu}m on as-rolled SS304 substrates. It was also shown that low particle velocity of about 10 m/s, which is peculiar to rf plasma spraying, was sufficient for particle deformation, though it imposed a severe limitation on the substrate position. These experimental results prove that rf plasma spraying is an effective process and a strong candidate to open new fields of spraying applications.

• OSTI ID: 7008611
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:11; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COATINGS
DATA
DEPOSITION
EXPERIMENTAL DATA
FABRICATION
INFORMATION
LATTICE PARAMETERS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PLASMA
PLASMA ARC SPRAYING
POWDERS
PROTECTIVE COATINGS
RF SYSTEMS
SIZE
SOLID-STATE PLASMA
SPRAY COATING
SURFACE COATING
TRANSITION ELEMENT COMPOUNDS
VELOCITY
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES