Nanohardness and fracture toughness of combustion chemical vapor deposition deposited yittria stabilized zirconia–alumina films

Stollberg, David W.; Carter, W. B.; Hampikian, J.M.

doi:10.1016/j.tsf.2005.01.002

Cited by 14 publications

(5 citation statements)

References 12 publications

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“…Nanoindentation experiments were performed at different regions of the samples’ surfaces to avoid surface effects in the case of neighbouring indentations. Furthermore, low roughness values are required for determining with high accuracy values of hardness and elastic modulus 64, 66. Electrical characterization was performed by in‐plane four‐point DC conductivity measurements in ambient air, using similar configuration with 58.…”

Section: Methodsmentioning

confidence: 99%

Properties of Flame Sprayed Ce_0.8Gd_0.2O_1.9‐δ Electrolyte Thin Films

Karageorgakis

Heel

Rupp

et al. 2010

Adv Funct Materials

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Thin films of Ce0.8Gd0.2O1.9‐δ (CGO) are deposited by flame spray deposition with a deposition rate of about 30 nm min−1. The films (deposited at 200 °C) are dense, smooth, and particle‐free and show a biphasic amorphous/nanocrystalline microstructure. Isothermal grain growth and microstrain are determined as a function of dwell time and temperature and correlated to the electrical conductivity. CGO films annealed for 10 h at 600 °C present the best electrical conductivity of 0.46 S m−1 measured at 550 °C. Reasons for the superior performance of films annealed at low temperature over higher‐temperature‐treated samples are discussed and include grain‐size evolution, microstrain relaxation, and chemical decomposition. Nanoindentation measurements are conducted on the CGO thin films as a function of annealing temperature to determine the hardness and elastic modulus of the films for potential application as free‐standing electrolyte membranes in low‐temperature micro‐SOFCs (solid oxide fuel cells).

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Section: Methodsmentioning

confidence: 99%

Properties of Flame Sprayed Ce_0.8Gd_0.2O_1.9‐δ Electrolyte Thin Films

Karageorgakis

Heel

Rupp

et al. 2010

Adv Funct Materials

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“…[18,35] Since precursor volatility is no longer an issue in AACCVD, this technique has the potential for producing materials from inexpensive chemicals dissolved in suitable organic or inorganic solvents. [18,23,35,[49][50][51][52][53][54] The quality of the products is dependent on a number of processing variables, such as the ratio of oxygen to fuel, and the substrate temperature. [46,47] For the production of oxide powder, liquid droplets rapidly evaporate when they are exposed to the high-temperature flame.…”

Section: Aaccvdmentioning

confidence: 99%

Processing and Applications of Aerosol‐Assisted Chemical Vapor Deposition

Hou

Choy

2006

Chemical Vapor Deposition

225

173

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The aerosol‐assisted (AA) CVD method involves the atomization of a precursor solution into fine, sub‐micrometer‐sized aerosol droplets which are delivered to a heated reaction zone and undergo evaporation, decomposition, and homogeneous and/or heterogeneous chemical reactions to form the desired products. As a variant of conventional CVD processes, AACVD addresses the availability and delivery problems of the chemical precursors. A wide range of precursors can be used since volatility is no longer crucial, offering more possibilities to produce high‐quality CVD products at low cost. Some variants of AACVD have also been developed, such as AA combustion (C) CVD, electrostatic spray‐assisted vapor deposition (ESAVD), and electrostatic‐assisted aerosol jet deposition (EAAJD). These variants provide additional flexibility and capability to the AACVD‐based processes. AACVD‐based processes have attracted increasing interest in most of the CVD‐related areas, and have been widely used to synthesize various films, coatings, powders, composites, nanotubes and nanowires, etc. This review highlights the principles, applications, and recent progress of AACVD‐based processes.

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“…[20], the CTE of YSZ/Al 2 O 3 layer is close to that of Ni-based superalloy, and higher than that of single Al 2 O 3 .Thus for the same DT, the thermal stresses in YSZ/Al 2 O 3 layer could be decreased than that of traditional TBC. In addition, the fracture toughness of YSZ/Al 2 O 3 layer can be improved by design YSZ/Al 2 O 3 composite structure [31]. And in yttria partially stabilized zirconia, the mechanical properties of this composite layer could be enhanced by means of transformation toughening from t-phase to m-phase in ZrO 2 [32,33].…”

Section: The Influence Of Composition On the Thermal Tresses And Mechmentioning

confidence: 99%

Fabrication and Characteristics of YSZ–YSZ/Al2O3 Double-Layer TBC

Ren

Wang

2011

Oxid Met

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A novel YSZ-YSZ/Al 2 O 3 (YSZ means 6 wt% yttria partially stabilized zirconia) double-layer thermal barrier coating was fabricated using composite sol-gel and pressure filtration microwave sintering (PFMS) technologies. In this double-layer coating, the top layer was YSZ ceramics with a thickness of about 150 lm and the bottom layer was composed of micro-sized YSZ particles packed by nano-sized a-Al 2 O 3 films and had a thickness of about 10 lm. Cyclic oxidation tests indicated that this coating possessed superior properties to resist oxidation of alloy and spallation of coating. These beneficial effects could be mainly attributed to that, the alloy substrate could be sealed completely by a-Al 2 O 3 phase and the thermal stress could be decreased by means of better thermal matching and nano/ micron structure in YSZ/Al 2 O 3 layer. Moreover, thermal insulation capability tests indicated that the thermal barrier effect was improved due to the application of YSZ/Al 2 O 3 layer. YSZ/Al 2 O 3 layer could be considered as a promising bond coat in TBCs.

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Nanohardness and fracture toughness of combustion chemical vapor deposition deposited yittria stabilized zirconia–alumina films

Cited by 14 publications

References 12 publications

Properties of Flame Sprayed Ce_0.8Gd_0.2O_1.9‐δ Electrolyte Thin Films

Properties of Flame Sprayed Ce_0.8Gd_0.2O_1.9‐δ Electrolyte Thin Films

Processing and Applications of Aerosol‐Assisted Chemical Vapor Deposition

Fabrication and Characteristics of YSZ–YSZ/Al2O3 Double-Layer TBC

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Nanohardness and fracture toughness of combustion chemical vapor deposition deposited yittria stabilized zirconia–alumina films

Cited by 14 publications

References 12 publications

Properties of Flame Sprayed Ce0.8Gd0.2O1.9‐δ Electrolyte Thin Films

Properties of Flame Sprayed Ce0.8Gd0.2O1.9‐δ Electrolyte Thin Films

Processing and Applications of Aerosol‐Assisted Chemical Vapor Deposition

Fabrication and Characteristics of YSZ–YSZ/Al2O3 Double-Layer TBC

Contact Info

Product

Resources

About

Properties of Flame Sprayed Ce_0.8Gd_0.2O_1.9‐δ Electrolyte Thin Films

Properties of Flame Sprayed Ce_0.8Gd_0.2O_1.9‐δ Electrolyte Thin Films