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High Temperature Material Processes (An International Quarterly of High-Technology Plasma Processes)

An International Journal

ISSN for PRINT: 1093-3611

Institutional price:	$604.00
Issues per year:	4

Best Paper Award Selection - Editorial Board Site

2007, Volume11

162 pages

DOI: 10.1615/HighTempMatProc.v11.i1

Issue price - $168.00

Plasma sprayed basalt/chromium oxide coatings

Helene Ageorges
SPCTS, UMR-CNRS 6638 University of Limoges, 123, avenue Albert Thomas, 87060 Limoges Cedex, France

Z. Medarhri
University of Limoges, SPCTS, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France

P. Ctibor
University of Limoges, SPCTS, 123 Avenue Albert Thomas, 87060 Limoges Cedex, France

Pierre Fauchais
Laboratoire Sciences des Precedes Ceramiques et de Traitements de Surface, UMR 6638 CNRS-Universite de Limoges, faculte des Sciences et Technique, conventionne avec le CEA n° M08, France

ABSTRACT

Volcanic basalt and chromium oxide (Cr₂O₃) have been co-sprayed in air with a direct current (d.c.) plasma to obtain composite coatings. Both powders were simultaneously injected by two separated injectors. The following spray parameters: arc current, hydrogen vol % and total plasma forming gas mass flow rate were optimized as well as injector positions. Different mass ratios of both components were used to achieve coatings. An uniform distribution of basalt among the Cr₂O₃ lamellae has been observed with SEM for all composite coatings. XRD showed that chromia became amorphous in the composite basalt/chromia coatings.