scholarly journals Yttria-Stabilized Zirconia Thermal Barriers Sprayed Using N2-H2 and Ar-H2 Plasmas: Influence of Processing and Heat Treatment on Coating Properties

2007 ◽  
Vol 16 (5-6) ◽  
pp. 791-797 ◽  
Author(s):  
B.R. Marple ◽  
R.S. Lima ◽  
C. Moreau ◽  
S.E. Kruger ◽  
L. Xie ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Yttria Stabilized Zirconia ◽  
Coating Properties ◽  
Stabilized Zirconia ◽  
Thermal Barriers

scholarly journals Effect of Deposition Conditions on Phase Content and Mechanical Properties of Yttria-Stabilized Zirconia Thin Films Deposited by Sol-Gel/Dip-Coating

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Francisco J. Cano ◽  
Orlando Castilleja-Escobedo ◽  
L. J. Espinoza-Pérez ◽  
Cecilia Reynosa-Martínez ◽  
Eddie Lopez-Honorato
Keyword(s):  
Heat Treatment ◽  
Wear Rate ◽  
Adhesion Strength ◽  
Surface Defects ◽  
Sol Gel ◽  
Dip Coating ◽  
Yttria Stabilized Zirconia ◽  
Cubic Phase ◽  
Phase Content ◽  
Stabilized Zirconia

The effect of yttria concentration (0-33.4 mol%), extraction rates (0.17, 0.33, 0.50, and 0.67 mm s-1), and the number of layers (up to four) on the phase content, surface defects, thickness, hardness, adhesion strength, and wear rate of yttria-stabilized zirconia coatings produced by sol-gel/dip-coating were studied for its use on thermolabile substrates. At 700°C, a metastable tetragonal phase ( t ″ ) was obtained even with 33.4 mol% yttria when heat treated for 24 hours; however, a fully cubic structure was attained by extending the heat treatment up to 48 hours as confirmed by Raman spectroscopy. Furthermore, it was necessary to use withdrawal speeds of at least 0.67 mm s-1 to produce defect-free coatings. Although the coatings were produced at low temperature, they showed 41% lower wear rate than steel and an adhesion strength of 30 MPa. Our work stresses the importance of the heat treatment history on the stabilization of the cubic phase in sol-gel YSZ coatings.

scholarly journals Electrochemical and Oxidation Behavior of Yttria Stabilized Zirconia Coating on Zircaloy-4 Synthesized via Sol-Gel Process

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
S. Rezaee ◽  
Gh. R. Rashed ◽  
M. A. Golozar
Keyword(s):  
Heat Treatment ◽  
Electrochemical Impedance ◽  
Sol Gel ◽  
Dip Coating ◽  
Open Circuit ◽  
Treatment Temperature ◽  
Yttria Stabilized Zirconia ◽  
Coated Sample ◽  
Stabilized Zirconia ◽  
Temperature Oxidation

Sol-gel 8 wt.% Yttria Stabilized Zirconia (YSZ) thin films were prepared on zirconium (zircaloy-4 alloy) by dip-coating technique followed by heat treating at various temperatures (200°C, 400°C, and 700°C) in order to improve both electrochemical corrosion and high temperature oxidation properties of the substrate. Differential thermal analysis and thermogravimetric analysis (DTA-TG) revealed the coating formation process. X-ray diffraction (XRD) was used to determine the crystalline phase structure transformation. The morphological characterization of the coatings was carried out using scanning electron microscopy (SEM). The electrochemical behavior of the coated and uncoated samples was investigated by means of open circuit potential, Tafel, and electrochemical impedance spectroscopy (EIS) in a 3.5 wt.% NaCl solution. The homogeneity and surface appearance of coatings produced was affected by the heat treatment temperature. According to the corrosion parameters, the YSZ coatings showed a considerable increase in the corrosion resistance, especially at higher heat treatment temperatures. The coating with the best quality, from the surface and corrosion point of view, was subjected to oxidation test in air at 800°C. The coated sample presented a 25% reduction in oxidation rate in comparison with bare substrate.

scholarly journals Heat treatment induced phase transformations in zirconia and yttria-stabilized zirconia monolithic aerogels

2019 ◽  
Vol 149 ◽  
pp. 54-63 ◽  
Author(s):  
Jorge Torres-Rodríguez ◽  
József Kalmár ◽  
Melita Menelaou ◽  
Ladislav Čelko ◽  
Karel Dvořak ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Transformations ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

Fatigue strength of yttria-stabilized zirconia polycrystals: Effects of grinding, polishing, glazing, and heat treatment

2017 ◽  
Vol 75 ◽  
pp. 512-520 ◽  
Author(s):  
Camila Pauleski Zucuni ◽  
Luís Felipe Guilardi ◽  
Marilia Pivetta Rippe ◽  
Gabriel Kalil Rocha Pereira ◽  
Luiz Felipe Valandro
Keyword(s):  
Heat Treatment ◽  
Fatigue Strength ◽  
Yttria Stabilized Zirconia ◽  
Stabilized Zirconia

Ion Irradiation Effects of Yttria-stabilized Zirconia Conductivity

2005 ◽  
Vol 885 ◽  
Author(s):  
Jeremy Cheng ◽  
Kevin Crabb ◽  
Rojana Pornprasertsuk ◽  
Hong Huang ◽  
Yuji Saito ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Solid Oxide Fuel Cells ◽  
Electrical Impedance ◽  
Ion Irradiation ◽  
Heavy Ion ◽  
Electrical Impedance Spectroscopy ◽  
Yttria Stabilized Zirconia ◽  
Irradiation Effects ◽  
Stabilized Zirconia ◽  
Heavy Ion Irradiation

ABSTRACTThe performance of solid oxide fuel cells is limited largely by ion transport in the electrolyte. Thin film electrolytes of yttria-stabilized zirconia were deposited by pulsed laser deposition. The electrolyte material was subjected to heavy ion irradiation and heat treatment and the effects on conductivity were measured using electrical impedance spectroscopy. Following irradiation there is a drop in conductivity by a factor of 3-4. After heat treatment at 800°C, the conductivity recovers to the as-deposited value.

Vanadia-induced transformations in yttria-stabilized zirconia

1988 ◽  
Vol 46 ◽  
pp. 792-793
Author(s):  
D.W. Susnitzky
Keyword(s):  
Thermal Barrier Coatings ◽  
Jet Fuel ◽  
Yttria Stabilized Zirconia ◽  
Thermal Barrier ◽  
Stabilized Zirconia ◽  
Bright Field ◽  
Barrier Coatings ◽  
Jet Engine ◽  
Thermal Barriers ◽  
Engine Components

Thermal-barrier coatings for jet-engine components are typically composed of Y2O3-stabilized ZrO2 (YSZ) since this material provides improved ceramic-to-metal bonding, thermal-stress resistance and stability. One problem associated with YSZ thermal barriers is the increased rate of coating failures encountered when trace amounts of impurities, such as 50ppm vanadium, are present in the jet fuel. V2O5 reacts with YSZ to form YVO4 and a monoclinic ZrO2 phase. Although coating failures are attributed to the 3-5% volume change associated with the tetragonal- to-monoclinic transformation, the exact mechanism of V2O5 attack has been unclear. The present study addresses the deleterious effects of V2O5 on YSZ at 810°-950°C by directly exposing perforated TEM specimens of single-crystal YSZ to the vapor produced by a small quantity of V2O5 powder. The experimental details of this thin-film reaction technique have been described elsewhere.Fig.l shows a bright-field (BF) image recorded from a (100)-oriented YSZ (9mol% Y2O3) specimen which was exposed to V2O5 vapor for 30 min at 810°C.

Electroless Deposition of La1−xSrxMnO3Perovskite Film on Yttria Stabilized Zirconia Substrate

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Sasaki ◽  
Y. Matsumoto
Keyword(s):  
Heat Treatment ◽  
Ion Exchange ◽  
Oxide Film ◽  
Exchange Reaction ◽  
Electroless Deposition ◽  
Yttria Stabilized Zirconia ◽  
Oxidizing Agent ◽  
Stabilized Zirconia ◽  
Ion Exchange Reaction

ABSTRACTA LaMnO3precursor was electrolessly deposited on a YSZ substrate in a solution containing Mn2+, La3+, an oxidizing agent and some additives. Peroxydisulfate was used as the oxidizing agent. The LaMnO3precursor was an amorphous and hydrous MnO2which contained La3+ions. The incorporation of La3+ions into the precursor oxide film was based on the ion-exchange reaction, where La3+ions in the solution were exchanged for H+ions on the deposited amorphous and hydrous MnO2. A La1-xSrxMnO3precursor was also prepared from the LaMnO3precursor by the ion-exchange reaction of some of the La3+ions in the LaMnO3precursor for Sr2+ions in the solution. (La0.5Sr0.5)0.75MnO3perovskite film was obtained from the precursor films on Pt substrate by heat-treatment at 800 °C.

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