IFIR 05409
INSTITUTO DE FISICA DE ROSARIO
Unidad Ejecutora - UE
artículos
Título:
Interdiffusion phenomena of zirconia-nitride layers in coated AISI 310 steel
Autor/es:
B. J. GÓMEZ; R. CARUSO; L. NACHEZ; A. DÍAZ-PARRALEJO; J. FEUGEAS; O. DE SANCTIS
Revista:
SURFACE AND COATINGS TECHNOLOGY
Editorial:
Elsevier
Referencias:
Lugar: Amsterdam; Año: 2008 p. 1 - 16
ISSN:
0257-8972
Resumen:
Duplex coatings on stainless steel AISI 310 were prepared by means of a double
process consisting of a nitrogen/hydrogen plasma ion-nitriding treatment and a
multilayer ZrO2-3 mole % Y2O3 coating grown by chemical solution deposition. In
this paper we investigate the interdiffusion phenomena between the elements and
the deposited phases. The zirconia coating process the nitrided steel initiated strong
diffusion events. An outer layer consisting of oxides of iron and zirconium and an
inner one of hematite are formed in the interface. A subsequent nitriding on the zirconia
coated nitraded steel shows interesting results concerning the effect of nitrogen
in the reduction of hematite. A more restricted interdiffusion is obtained when the
order of performing the nitriding process and zirconia coating is reversed. The zirconia
coating retains nitrogen atoms, which are incorporated into the structure of
the zirconia forming a substitutional solid solution, which prevents the penetration
of nitrogen into the substrate metal. Hydrogen, one of the components of the gas
mixture, diffuses easily throughout the coating and acts as a reducing agent. The
layer of zirconia works as a sieve, retaining nitrogen and allowing the passage of
hydrogen.2-3 mole % Y2O3 coating grown by chemical solution deposition. In
this paper we investigate the interdiffusion phenomena between the elements and
the deposited phases. The zirconia coating process the nitrided steel initiated strong
diffusion events. An outer layer consisting of oxides of iron and zirconium and an
inner one of hematite are formed in the interface. A subsequent nitriding on the zirconia
coated nitraded steel shows interesting results concerning the effect of nitrogen
in the reduction of hematite. A more restricted interdiffusion is obtained when the
order of performing the nitriding process and zirconia coating is reversed. The zirconia
coating retains nitrogen atoms, which are incorporated into the structure of
the zirconia forming a substitutional solid solution, which prevents the penetration
of nitrogen into the substrate metal. Hydrogen, one of the components of the gas
mixture, diffuses easily throughout the coating and acts as a reducing agent. The
layer of zirconia works as a sieve, retaining nitrogen and allowing the passage of
hydrogen.
