Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

Yanar, N. M.; Helminiak, M.A.; Meier, G. H.; Pettit, F. S.

doi:10.1007/s11661-010-0436-7

Cited by 42 publications

(27 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similarly Zhu et al report thin dense lamellar YSZ coatings [14]. Many other authors have reported examples of PS-PVD coatings [1,6,7,[9][10][11][12][13][15][16][17].…”

Section: Coating Examples (Ps-pvd and Ps-tf)mentioning

confidence: 98%

Very Low Pressure Plasma Spray—A Review of an Emerging Technology in the Thermal Spray Community

et al. 2011

View full text Add to dashboard Cite

Abstract:A fundamentally new family of thermal spray processes has emerged. These new processes, collectively known as very low pressure plasma spray or VLPPS, differ from traditional thermal spray processes in that coatings are deposited at unusually low chamber pressures, typically less than ~800 Pa (6 Torr). Depending upon the specific process, deposition may be in the form of very fine molten droplets, vapor phase deposition, or a mixture of vapor and droplet deposition. Resulting coatings are similar in quality to coatings produced by alternative coating technologies, such as physical vapor deposition (PVD) or chemical vapor deposition (CVD), but deposition rates can be roughly an order of magnitude higher with VLPPS. With these new process technologies modified low pressure plasma spray (LPPS) systems can now be used to produce dense, high quality coatings in the 1 to 100 micron thickness range with lamellar or columnar microstructures. A history of pioneering work in VLPPS technology is presented, deposition mechanisms are discussed, potential new applications are reviewed, and challenges for the future are outlined. OPEN ACCESSCoatings 2011, 1 118

show abstract

“…Similarly Zhu et al report thin dense lamellar YSZ coatings [14]. Many other authors have reported examples of PS-PVD coatings [1,6,7,[9][10][11][12][13][15][16][17].…”

Section: Coating Examples (Ps-pvd and Ps-tf)mentioning

confidence: 98%

Very Low Pressure Plasma Spray—A Review of an Emerging Technology in the Thermal Spray Community

et al. 2011

View full text Add to dashboard Cite

show abstract

“…The most important elements that cause the formation of these cracks on TBC and TGO layer are stresses that occur as a result of TGO growth, phase transformations in bond coat, changes in bond coat during thermal cycle and sintering of TBC. Once the cracks form, they propagate and coalesce and result in failure of the coating [83][84][85].…”

Section: Thermal Shock Conceptmentioning

confidence: 99%

“…The rate of mismatch between superalloy substrate material and top coat affects elastic strain energy that is stored during cooling from working temperature. High amount of strain energy causes early removal/breaking of coating as a result of cycling [84,[87][88].…”

Section: Thermal Shock Conceptmentioning

confidence: 99%

Thermal Shock and Cycling Behavior of Thermal Barrier Coatings (TBCs) Used in Gas Turbines

Karaoğlanlı¹,

Ogawa²,

Türk³

et al. 2013

Progress in Gas Turbine Performance

View full text Add to dashboard Cite

Gas turbine engines work as a power generating facility and are used in aviation industry to provide thrust by converting combustion products into kinetic energy [ -]. Basic concerns regarding the improvements in modern gas turbine engines are higher efficiency and performance. Increase in power and efficiency of gas turbine engines can be achieved through increase in turbine inlet temperatures [ , ]. For this purpose, the materials used should have perfect mechanical strength and corrosion resistance and thus be able to work under aggressive environments and high temperatures [ ]. The temperatures that turbine blades are exposed to can be close to the melting point of the superalloys. For this reason, internal cooling by cooling channels and insulation by thermal barrier coatings TBCs is used in order to lower the temperature of turbine blades and prevent the failure of superalloy substrates [ -]. By utilizing TBCs in gas turbines, higher turbine inlet temperatures are allowed and as a result an increase in turbine efficiency is obtained [ ]. TBCs are employed in a variety of areas such as power plants, advanced turbo engine combustion chambers, turbine blades, vanes and are often used under high thermal loads [ -]. Various thermal shock tests are conducted by aerospace and land gas turbine manufacturers in order to develop TBCs and investigate the quality control characteristics. Despite that fact, a standardized method is still lacking. The reason lies behind the difficulty of finding a testing method that can simulate all the service and loading conditions. Present testing systems developed by the engine manufacturers for simulation of real thermal conditions in engines consist of burner rig thermal shock testing units, jet engine thermal shock testing units and furnace cycle tests [ -]. In this study, thermal cycle and thermal shock behavior of TBC systems under service conditions are examined, and a collection of testing methods used in evaluation of performance and endur- Including the introductory chapter, the study consists of four parts .Chapter The aim of the study is explained. An introduction is given as general characteristics and application of thermal barrier coatings in gas turbine engines, and thermal cycle/ shock characteristics under service conditions..Chapter Thermal Barrier Coating TBC systems are presented and also production, structure and characteristics are explained..Chapter Thermal shock and cycle behavior of TBC system applications in gas turbines is given. Testing methods and criteria is presented. Evaluation of TBC systems after thermal shock/cycle tests is given and microstructural evaluation is mentioned..Chapter The findings of given studies are summarized and results are presented. . Thermal barrier coating TBC. . An overview of TBCs A typical TBC system, which is used in gas turbine engines to thermally protect metallic components from aggressive environmental effects, consists of a superalloy substrate material, a metallic bond coat for oxidation resistance, a ceramic top co...

show abstract

“…If crack growth increases, the value of the elastic modulus will change and that will hamper the TBC life period under service conditions [13][14][15]. The failure of the coatings depends on cracks, show when they propagate and result in failure [16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Creep strength of Al2O3 + ZrO2·5CaO subjected to thermal cyclic test

Abhinav

Krishnamurthy²,

Ribeiro

et al. 2019

SN Appl. Sci.

View full text Add to dashboard Cite

The present paper examines the failure mechanism of the coating system of Al 2 O 3-ZrO 2 •5CaO applied on a Cast iron substrate. The atmospheric plasma spray coating technique was used for coating. A muffle furnace was used to heat the sample to 600 ± 2 °C followed by ambient cooling. Both the heating and cooling cycles were maintained for 30 min. Results were compared between the as-sprayed coated specimen and the post thermal cyclic test specimen. It has been noticed that normal stresses developed due to the formation of thermally grown oxide at the interface of the top/bond coat and constitutes the weakest link in the coating system. Also, differential porosity at the interface led the moisture to penetrate from the top coat to the bottom coat. Thus, a thermochemical process occurred below the bond coat, leading to the formation of oxides and made the top coat gradually more brittle during the thermal cyclic process. Keywords Al 2 O 3-ZrO 2 •5CaO • Muffle furnace • Thermal barrier coatings • Thermally grown oxide • Thermochemical

show abstract

Comparison of the Failures during Cyclic Oxidation of Yttria-Stabilized (7 to 8 Weight Percent) Zirconia Thermal Barrier Coatings Fabricated via Electron Beam Physical Vapor Deposition and Air Plasma Spray

Cited by 42 publications

References 23 publications

Very Low Pressure Plasma Spray—A Review of an Emerging Technology in the Thermal Spray Community

Very Low Pressure Plasma Spray—A Review of an Emerging Technology in the Thermal Spray Community

Thermal Shock and Cycling Behavior of Thermal Barrier Coatings (TBCs) Used in Gas Turbines

Creep strength of Al2O3 + ZrO2·5CaO subjected to thermal cyclic test

Contact Info

Product

Resources

About