Suscripción a Biblioteca: Guest
Portal Digitalde Biblioteca Digital eLibros Revistas Referencias y Libros de Ponencias Colecciones
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.176 SNIP: 0.48 CiteScore™: 1.3

ISSN Imprimir: 1093-3611
ISSN En Línea: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v14.i4.90
pages 389-399

PLASMA SPRAYED COATINGS OF MECHANOFUSED ALUMINA-STEEL PARTICLES

Helene Ageorges
University of Angers, LETP, 2 Boulevard Lavoisier, 49045 Angers Cedex, France
Alain Grimaud
L.E.T.P., Faculté des Sciences, 2 Bd Lavoisier 49045 Angers Cedex, France
Pierre Fauchais
Laboratoire Sciences des Procedes Ceramiques et de Traitements de Surface UMR CNRS 6638 University of Limoges 123 avenue Albert Thomas, 87060 LIMOGES - France

SINOPSIS

Steel particles (Fe + 19 wt% Cr and 11 wt% Ni) with a size distribution in the range between 50 and 100 μm were coated with pure α-alumina (99.99%) particles whose mean size was 0.6 μm using a mechanofusion process. It was possible to obtain particles with alumina shells with a mean thickness of 2−4 μm. EDS analysis showed that, according to the detection limit, no alumina was imbedded in the steel core and reciprocally no steel was included in the alumina shell. The composite powder was then plasma sprayed using a PTF4 type plasma gun (nozzle internal diameter 7 mm) with the internal injection of the powder 3 mm upstream of the nozzle exit. The arc current was 500 A and plasma forming gas mixture was 53 slm Ar and 7 slm H2. The coatings were sprayed on cast iron samples (diameter: 25 mm, thickness: 5 mm) located on a rotating substrate holder (110 mm diameter). The plasma torch was moved parallel to the holder axis. The substrates were preheated with the plasma gun and their surface temperature was controlled by air jets monitored by an IR monochromatic pyrometer. The coatings showed a uniform distribution of alumina in the steel matrix for two substrate preheating temperatures of 300 and 550° C.


Articles with similar content:

PLASMA SPRAYED COATINGS OF MECHANOFUSED ALUMINA-STEEL PARTICLES
Progress in Plasma Processing of Materials, 1999, Vol.1, 1999, issue
Helene Ageorges, Alain Grimaud, Pierre Fauchais
INFLUENCE OF VOLTAGE FLUCTUATIONS RELATED TO PLASMA TORCH WORKING CONDITIONS ON ZIRCONIA PARTICLE THERMAL TREATMENT
High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes, Vol.11, 2007, issue 2
Michel Vardelle, P. Granger, E. Nogues, Pierre Fauchais
ION CLEANING AND NITRIDING USING A HIGH APERTURE HALL CURRENT ACCELERATOR
Progress in Plasma Processing of Materials, 2001, Vol.0, 2001, issue
M. Friesel , N .F. Vershinin, S. A. Polyakov, B. B. Straumal, P. V. Orlova, W. Gust
PLASMA SPRAYING OF A PEROVSKITE SUSPENSION FOR SOFC CATHODES
Progress in Plasma Processing of Materials, 2003, Vol.0, 2003, issue
C. Monterrubio Badillo, T. Chartier, J. F. Coudert, Helene Ageorges, Pierre Fauchais
PRODUCTION OF NANOCRYSTALLINE RDX BY RAPID EXPANSION OF SUPERCRITICAL SOLUTIONS
International Journal of Energetic Materials and Chemical Propulsion, Vol.6, 2007, issue 1
Nikolai L. Lavrik, Inga B. Elkina, Lev N. Krasnoperov, Xuyean Zhang, Victor Stepanov, Takuya Matsunaga, Andrei V. Chernyshev, Evgeny N. Chesnokov