Structure-property relationship and design of plasma-sprayed La2Ce2O7/8YSZ composite coatings for gas turbine blades

Abstract This paper describes variations in the microstructure/composition and mechanical properties in plasma sprayed CoCrAlY coatings and a modified Rene 80 substrate of gas turbine blades operated for 21000 h under liquefied natural gas fuels. Substantial oxidation/carbonization occurred in near surface coatings of concave blades but not in convex coatings. Aluminum and nickel/titanium rich nitrides formed in concave coatings and substrates adjacent to the interface, respectively. Small punch (SP) specimens were prepared in order that the specimen surface would be located in the near surface and interface regions of the concave and convex coatings. In SP tests, brittle cracks in the near surface and interface coatings of the concave blade initiated at low strains up to 950 °C. The convex coatings had higher ductility than the concave coatings and substrate and showed a rapid increase in the ductility above 800 °C. Thus it is apparent that the oxidation/carbonization and nitridation in the concave coatings produced a significant loss of the ductility. The in-service degradation mechanism of the CoCrAlY coatings is discussed in light of the operating temperature distribution and compared to that of CoNiCrAIY coatings induced by grain boundary sulfidation/oxidation.

Download Full-text

Thermal Analysis & Studies on Low Pressure Gas Turbine Blades Coated with Yitria Stabilized Zirconia (YSZ)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.622-623.1596 ◽

2012 ◽

Vol 622-623 ◽

pp. 1596-1600

Author(s):

N. Rajasekar ◽

P.M. Shivraj ◽

C.J. Thomas Renald ◽

K. Karthick ◽

M.P. Tamizhmani

Keyword(s):

Gas Turbine ◽

Turbine Blades ◽

Thermal Barrier ◽

Stabilized Zirconia ◽

Turbine Engine ◽

Gas Turbine Blades ◽

Barrier Coating ◽

Potential Applications ◽

Plasma Sprayed ◽

Engine Components

The thermal barrier coatings have many potential applications in the protection of gas turbine engine components, essentially the turbine blades.In this study micro analysis was carried out on Yitria Stabilized Zirconia(YSZ) coated turbine blades and the results are compared with the uncoated blades.We have used the atmosphere plasma sprayed thermal barrier coating with a thickness of 0.25mm to withstand the high temperature of about 2000 C.We observed that by increasing the thermal coating thickness of about 0.25mm cause to increase 50% of the surface temperature of the turbine blade,which in turn increased the aero engine thrust.

Download Full-text

LARGE EDDY SIMULATION APPLIED TO INTERNAL FORCED-CONVECTION COOLING OF GAS-TURBINE BLADES

Proceeding of International Heat Transfer Conference 11 ◽

10.1615/ihtc11.1320 ◽

1998 ◽

Cited By ~ 2

Author(s):

Akira Murata ◽

Sadanari Mochizuki

Keyword(s):

Large Eddy Simulation ◽

Gas Turbine ◽

Forced Convection ◽

Turbine Blades ◽

Gas Turbine Blades ◽

Eddy Simulation ◽

Large Eddy ◽

Convection Cooling

Download Full-text

Exploration of Bis(Arylimidazole) Iridium Picolinate Complexes

10.26434/chemrxiv.5331460.v1 ◽

2017 ◽

Cited By ~ 1

Author(s):

Aron Huckaba ◽

sadig aghazada ◽

iwan zimmermann ◽

giulia grancini ◽

natalia gasilova ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Photophysical Properties ◽

Structure Property ◽

Aryl Group ◽

Ligand Modification ◽

Property Relationship ◽

Structure Property Relationship

The straightforward synthesis and photophysical properties of a new series of heteroleptic Iridium (III) bis(2-arylimidazole) picolinate complexes is reported. Each complex has been characterized by NMR, UV-Vis, cyclic voltammetry, and the emissive properties of each is described. By systematically modifying first the cyclometallating aryl group on the arylimidazole ligand and then the picolinate ligand, the ramifications of ligand modification in these complexes was better understood through the construction of a structure-property relationship.

Download Full-text

Exploration of Bis(Arylimidazole) Iridium Picolinate Complexes

10.26434/chemrxiv.5331460 ◽

2017 ◽

Author(s):

Aron Huckaba ◽

sadig aghazada ◽

iwan zimmermann ◽

giulia grancini ◽

natalia gasilova ◽

...

Keyword(s):

Cyclic Voltammetry ◽

Photophysical Properties ◽

Structure Property ◽

Aryl Group ◽

Ligand Modification ◽

Property Relationship ◽

Structure Property Relationship

The straightforward synthesis and photophysical properties of a new series of heteroleptic Iridium (III) bis(2-arylimidazole) picolinate complexes is reported. Each complex has been characterized by NMR, UV-Vis, cyclic voltammetry, and the emissive properties of each is described. By systematically modifying first the cyclometallating aryl group on the arylimidazole ligand and then the picolinate ligand, the ramifications of ligand modification in these complexes was better understood through the construction of a structure-property relationship.

Download Full-text

UDIMET L-605

Alloy Digest ◽

10.31399/asm.ad.co0109 ◽

2004 ◽

Vol 53 (12) ◽

Keyword(s):

Corrosion Resistance ◽

High Temperature ◽

Physical Properties ◽

Tensile Properties ◽

Gas Turbine ◽

Oxidation Resistance ◽

Turbine Blades ◽

Heat Treating ◽

Gas Turbine Blades ◽

Temperature Performance

Abstract Udimet L-605 is a high-temperature aerospace alloy with excellent strength and oxidation resistance. It is used in applications such as gas turbine blades and combustion area parts. This datasheet provides information on composition, physical properties, and tensile properties as well as creep. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, and joining. Filing Code: CO-109. Producer or source: Special Metals Corporation.

Download Full-text

Simple Thiophene Based Organic Dyes as Active Photosensitizers for DSSC Application: from Molecular Design to Structure Property Relationship

Journal of Nano- and Electronic Physics ◽

10.21272/jnep.12(2).02039 ◽

2020 ◽

Vol 12 (2) ◽

pp. 02039-1-02039-5 ◽

Cited By ~ 1

Author(s):

Kavya S. Keremane ◽

◽

Praveen Naik ◽

Airody Vasudeva Adhikari ◽

◽

...

Keyword(s):

Molecular Design ◽

Organic Dyes ◽

Structure Property ◽

Property Relationship ◽

Structure Property Relationship

Download Full-text

Quantitative Structure- Property Relationship (QSPR) Investigation of Camptothecin Drugs Derivatives

Combinatorial Chemistry & High Throughput Screening ◽

10.2174/1386207321666180927102836 ◽

2018 ◽

Vol 21 (7) ◽

pp. 533-542 ◽

Cited By ~ 2

Author(s):

Neda Ahmadinejad ◽

Fatemeh Shafiei ◽

Tahereh Momeni Isfahani

Keyword(s):

Thermodynamic Properties ◽

Predictive Ability ◽

Total Sample ◽

Basis Sets ◽

Quantitative Structure ◽

Structure Property ◽

Quantitative Structure Property Relationship ◽

Chemical Structures ◽

Property Relationship ◽

Structure Property Relationship

Aim and Objective: Quantitative Structure- Property Relationship (QSPR) has been widely developed to derive a correlation between chemical structures of molecules to their known properties. In this study, QSPR models have been developed for modeling and predicting thermodynamic properties of 76 camptothecin derivatives using molecular descriptors. Materials and Methods: Thermodynamic properties of camptothecin such as the thermal energy, entropy and heat capacity were calculated at Hartree–Fock level of theory and 3-21G basis sets by Gaussian 09. Results: The appropriate descriptors for the studied properties are computed and optimized by the genetic algorithms (GA) and multiple linear regressions (MLR) method among the descriptors derived from the Dragon software. Leave-One-Out Cross-Validation (LOOCV) is used to evaluate predictive models by partitioning the total sample into training and test sets. Conclusion: The predictive ability of the models was found to be satisfactory and could be used for predicting thermodynamic properties of camptothecin derivatives.

Download Full-text