Electrolytic ZrO2 Coatings: II. Microstructural Aspects

Chaim, R.; Silberman, I.; Gal‐Or, L.

doi:10.1149/1.2085905

Cited by 61 publications

(32 citation statements)

References 11 publications

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“…As expected, XRD (data not shown) revealed that the films are composed of amorphous ZrO 2 , due to the low temperature at which deposition took place. This is in complete agreement with previous reports, for example, by Chaim et al, [15] who deposited ZrO 2 under galvanostatic conditions in aqueous solutions starting from ZrO 2 + as the precursor. They also observed a very broad XRD peak around 2 q % 308.…”

Section: Resultssupporting

confidence: 93%

Electrochemically Induced Sol–Gel Deposition of Zirconia Thin Films

Shacham

Mandler

Avnir

2004

Chemistry A European J

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A novel electrochemical method for deposition of ZrO(2) thin films is described. The films, 50-600 nm thick, were obtained by applying moderate positive or negative potentials (+2.5 V to -1.5 V versus SHE) on conducting surfaces immersed in a 2-propanol solution of zirconium tetra-n-propoxide [Zr(OPr)(4)] in the presence of minute quantities of water (water/monomer molar ratios in the range of 10(-5) to 10(-1)), which was the limiting reagent. Oxidative electrochemical formation of solvated H(+) and reductive formation of OH(-) catalyze the hydrolysis and condensation of the metal alkoxide precursor. The magnitude of the applied potential and its duration provide a convenient way of controlling the film thickness. The films consist of an amorphous phase, as revealed by XRD measurements. The effects of different parameters, such as the applied potential and its duration, the amount of added water and the current-time characteristics, were studied. A mechanism for the electrodeposition of the zirconia films which is in accordance with our findings is proposed.

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Section: Resultssupporting

confidence: 93%

Electrochemically Induced Sol–Gel Deposition of Zirconia Thin Films

Shacham

Mandler

Avnir

2004

Chemistry A European J

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“…The pH increase provokes precipitation in the pores and at the surface of oxides or hydroxides compounds with varying degrees of hydration [1,3] …”

Section: Preparation Of Alumina Depositsmentioning

confidence: 99%

“…This is usually done by the use of ceramic oxides such as alumina [1][2][3][4][5][6]. Numerous methods can be used to obtain these coatings [1][2][3][4][5][6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and characterization of electrolytic alumina deposit on austenitic stainless steel

Hajjaji¹,

Alaoui

Simon

et al. 2005

Science and Technology of Advanced Materials

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Conversion coating modified by alumina has been studied as a way for improving the resistance to thermal oxidation of an austenitic stainless steel. Conversion coating, characterized by a particular morphology and strong interfacial adhesion with the substrate, facilitate the electrochemical deposition of ceramic layers and enhance their adhesion to the substrate. The influence of the current density and treatment time on alumina deposit was studied using statistical experimental designs like Doehlert uniform shell design. After heating, coatings present a continuous composition gradient with refractory compounds at the surface. The behavior at high temperature (1000 8C) of the alumina coating was investigated. The presence of alumina increases the oxidation resistance of an austenitic stainless steel at 1000 8C. The morphology and the chemical composition of the deposit are analyzed. Results on the thermal stability of coating on austenitic stainless steel are presented. q

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“…Ceramic coatings are generally suitable for high temperature oxidation due to the a-alumina content [8][9][10] , but an increase in the service temperature leads to more structural stability, which could reduce its oxidation resistance.…”

Section: Introductionmentioning

confidence: 99%

Oxidation behaviour at 1123 K of AISI 304-Ni/Al-Al2O3/TiO2 multilayer system deposited by flame spray

Habib¹,

Saura²,

Ferrer³

et al. 2011

REVMETAL

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The oxidation behaviour of alumina/titania (97/3, 87/13 and 60/40) ceramic coatings using a Ni-Al coupling layer was studied in a thermobalance. Both layers were deposited on an AISI 304 stainless steel base metal by the flame spray technique. The coated steel was heated from room temperature to 1,123 K at 40 K min -1 , oxidized in air for 50 h, and then cooled to room temperature at 40 K min -1 . The mass gain was mainly attributed to the oxidation of Ni-Al coupling layer. Kinetic laws, DW·S -1 (mg.mm -2 ) vs. time (hours) were close to a parabolic plot for each sample. Surface composition of ceramic top layer and the cross section of multilayer system were analysed using a wide range of experimental techniques including Scanning Electron Microscopy (SEM), equipped with a link energy dispersive X-Ray spectroscopy (EDX) and X-Ray diffraction (XRD) before and after the oxidation process. Coatings 97/3 and 87/13 presented a stable structure after flame spray deposition and they did not evolve with the oxidation process, while most of the 60/40 coating changed to a metastable structure after deposition and to a more stable structure after oxidation with high micro-cracks content. SEM and EDX microanalysis of the cross-sections showed that significant oxidation and a weak intergranular precipitation had been produced in the coupling layer and on the stainless steel base metal, respectively. ResumenEl comportamiento a oxidación de recubrimientos cerámicos alúmina/titania (97/3, 87/13, 60/40) usando una capa de anclaje Ni-Al se ha estudiado mediante una termobalanza. Ambas capas se han depositado sobre un acero inoxidable AISI 304 utilizando la técnica de proyección llama (FS). El acero recubierto se ha calentado desde la temperatura ambiente hasta 1.123 K a 40 K min -1 , se ha oxidado al aire durante 50 h, y luego se ha enfriado hasta la temperatura ambiente a 40 K min -1 . La ganancia en masa se atribuye a la oxidación de la capa de enganche Ni-Al. La cinética DW·S -1 (mg.mm -2 ) vs. tiempo (horas) se ha ajustado a una ley parabólica para todas las muestras. La composición superficial de la capa cerámica y la sección transversal del sistema multicapa se han analizado mediante las técnicas de Microscopía Electrónica de Barrido (SEM), Espectroscopia de Energías Dispersivas de Rayos X (EDX), Difracción de Rayos X (XRD) antes y después del proceso de oxidación. Los recubrimientos 97/3 y 87/13 han presentado una estructura estable tras el proceso de deposición por proyección por llama y esta estructura tampoco ha evolucionado después de la oxidación, mientras la mayor parte del recubrimiento 60/40 ha cambiado a una estructura metaestable después la deposición y finalmente ha evolucionado a una estructura más estable después de la oxidación con alto contenido de microagrietamiento. El microanálisis mediante SEM y EDX de las secciones transversales han mostrado una oxidación significativa en la capa de enganche y una débil precipitación intergranular en el material base AISI 304. Palabras claveAISI 304; Capa de an...

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Electrolytic ZrO2 Coatings: II. Microstructural Aspects

Cited by 61 publications

References 11 publications

Electrochemically Induced Sol–Gel Deposition of Zirconia Thin Films

Electrochemically Induced Sol–Gel Deposition of Zirconia Thin Films

Preparation and characterization of electrolytic alumina deposit on austenitic stainless steel

Oxidation behaviour at 1123 K of AISI 304-Ni/Al-Al<sub>2</sub>O<sub>3</sub>/TiO<sub>2</sub> multilayer system deposited by flame spray

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