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TiO-based coatings prepared by plasma spraying in air of Ti + C mixtures

Published online by Cambridge University Press:  01 July 2006

B. Haller ,
A. Grimaud ,
J-C. Labbe  and
J-P. Bonnet
B. Haller*
Affiliation:
Groupe d'Etude des Matériaux Hétérogènes (GEMH) AE 3178, 87060 Limoges cedex, France
A. Grimaud
Affiliation:
Laboratoire Sciences des Procédés Céramiques et de Traitements de Surface (SPCTS) UMR-CNRS 6638, 87060 Limoges cedex, France
J-C. Labbe*
Affiliation:
Laboratoire Sciences des Procédés Céramiques et de Traitements de Surface (SPCTS) UMR-CNRS 6638, 87060 Limoges cedex, France
J-P. Bonnet
Affiliation:
Groupe d'Etude des Matériaux Hétérogènes (GEMH) AE 3178, 87060 Limoges cedex, France
*
a)Address all correspondence to these authors. e-mail: gemh@ensci.fr
b)Address all correspondence to these authors. e-mail: jean-claude.labbe@unilim.fr
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Abstract

This work presents an original way for preparing TiO-based coatings by thermal spraying. As titanium monoxide is oxidized by the mere trace of oxygen contained in hydrogen, it is obvious that plasma spraying of TiO powder does not lead easily to the formation of a titanium monoxide coating. However, thermodynamical calculations show that the conditions necessary for the preparation of TiO can be reached, at the titanium melting temperature (Tm=1933 K), when oxygen reacts with liquid metal in the presence of excess carbon. These results have led to experiments in which TiO-based coatings have been prepared by spraying a stoichiometric mixture of graphite and titanium grains onto cast iron in air. In optimal conditions, a gas-tight hard coating (1000 ± 15 HV3) of a TiO-based phase (composition: TiO0.81±0.06C0.04±0.02) has been obtained.

Keywords

OxidationPlasma depositionPowder processing
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 7 , July 2006 , pp. 1770 - 1774
Copyright
Copyright © Materials Research Society 2006

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References

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