Searched for: subject%3A%22Thermal%255C+barrier%255C+coatings%22
(1 - 18 of 18)
document
Ding, Z. (author)
Thermal barrier coatings (TBCs) are applied on the surface of metallic components of<br/>modern jet engines such as combustion chambers, blades and vanes, in order to increase the<br/>engine efficiency by allowing higher operating temperatures. However, during cooling from<br/>the operating temperature (i.e. 1000 °C) to room temperature high...
doctoral thesis 2024
document
Ding, Z. (author), Brouwer, J.C. (author), Kwakernaak, C. (author), Zhu, Jia-Ning (author), Popovich, V. (author), Hermans, M.J.M. (author), Sloof, W.G. (author)
To prevent premature triggering of the healing reaction in Mo-Si containing self-healing thermal barrier coating system, an oxygen impenetrable shell (α-Al<sub>2</sub>O<sub>3</sub>) around the sacrificial healing particles (MoSi<sub>2</sub>) is desired. Here an encapsulation method is presented through selective oxidation of Al in Mo(Al<sub>x...
journal article 2023
document
Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)
The thermal cyclic behavior of self-healing thermal barrier coatings (SH-TBC) is analyzed numerically to develop a lifetime prediction model. Representative microstructures are studied adopting a unit cell based multiscale modeling approach along with a simplified evolution model for the thermally-grown oxide layer (TGO) to study the...
journal article 2021
document
Krishnasamy, J. (author)
Thermal Barrier Coating (TBC) systems are protective layers applied to critical structural components of gas turbines operating at high-temperature. A typical TBC system consists of three different layers, namely a ceramic Top Coat (TC), an active Thermally Grown Oxide (TGO) layer and a metallic Bond Coat (BC). The outer ceramic TC that protects...
doctoral thesis 2020
document
Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)
The effect of splat interfaces on the fracture behavior of air plasma-sprayed thermal barrier coatings (APS-TBC) is analyzed using finite element modeling involving cohesive elements. A multiscale approach is adopted in which the explicitly resolved top coat microstructural features are embedded in a larger domain. Within the computational...
journal article 2019
document
Ponnusami, S.A. (author), Krishnasamy, J. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)
A computational fracture analysis is conducted on a self-healing particulate composite employing a finite element model of an actual microstructure. The key objective is to quantify the effects of the actual morphology and the fracture properties of the healing particles on the overall mechanical behaviour of the (MoSi2) particle-dispersed...
journal article 2019
document
Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)
The influence of microstructural pore defects on fracture behaviour of Thermal Barrier Coatings (TBC) is analysed using finite element analysis involving cohesive elements. A concurrent multiscale approach is utilised whereby the microstructural features of the TBC are explicitly resolved within a unit cell embedded in a larger domain. Within...
journal article 2019
document
Krishnasamy, J. (author), Ponnusami, Sathiskumar A. (author), Turteltaub, S.R. (author), van der Zwaag, S. (author)
The performance of a self-healing Thermal Barrier Coating (TBC) containing dispersed healing particles depends crucially on the mismatch in thermomechanical properties between the healing particles and the TBC matrix. The present work systematically investigates this phenomenon based on numerical simulations using cohesive element-based finite...
journal article 2018
document
Ponnusami, S.A. (author)
Research in the field of self-healing materials gained significant attention in the last decade owing to its promise of enhanced durability of the material components in engineering applications. Though the research has led to several successful demonstrations, extensive experimental tests will be required for a successful demonstration. Further...
doctoral thesis 2018
document
Carabat, A.L. (author), Meijerink, M.J. (author), Brouwer, J.C. (author), Kelder, E.M. (author), van Ommen, J.R. (author), van der Zwaag, S. (author), Sloof, W.G. (author)
A successful sol-gel process to encapsulate molybdenum di-silicide MoSi<sub>2</sub> particles with a closed and thermally stable Al<sub>2</sub>O<sub>3</sub> layer using aluminium tri-sec-butoxide as a precursor is presented. The processing conditions such as precursor selection and temperature were optimized through analysing the interaction...
journal article 2018
document
Kulczyk-Malecka, Justyna (author), Zhang, Xun (author), Carr, James (author), Nozahic, Franck (author), Estournès, Claude (author), Monceau, Daniel (author), Carabat, A.L. (author), Sloof, W.G. (author), van der Zwaag, S. (author), Withers, Philip J. (author), Xiao, Ping (author)
Yttria – partially stabilised zirconia (YPSZ) MoSi<sub>2</sub> composites have been designed to prolong the lifetime of the matrix by self – healing cracks during thermal cycling. The healing reaction at high temperatures is based on the decomposition of MoSi<sub>2</sub>, leading to a volumetrically expanding reaction product, which seals the...
journal article 2018
document
Nozahic, Franck (author), Estournès, Claude (author), Carabat, A.L. (author), Sloof, W.G. (author), van der Zwaag, S. (author), Monceau, Daniel (author)
The present paper focuses on the Spark Plasma Sintering (SPS) manufacturing of a new type of self-healing thermal barrier coating (TBC) and a study of its thermal cycling behaviour. The ceramic coating consists on an Yttria Partially Stabilized Zirconia (YPSZ) matrix into which healing agents made of MoSi<sub>2</sub>-Al<sub>2</sub>O<sub>3<...
journal article 2018
document
Rueda Ruiz, M. (author)
Thermal barrier coatings (TBC) are often applied to hot components of modern turbojet engines. These coatings increase the performance of the engine and enhance the lifetime of its structural components. Thus, improving the TBC lifetime is related with a reduction of maintenance costs and increased reliability. As an alternative to conventional...
master thesis 2016
document
Kurniadi Isnu, I.I. (author)
A novel method to encapsulate MoSi2B healing particles was explored via in situ shell formation in yttria-stabilised zirconia thermal barrier coatings (YSZ-BCs). The shell formation was analysed for MoSi2B healing particles alloyed with 2, 6 and 12 wt% Al. According to oxidation kinetics study at 1100˚C using thermogravimetry, MoSi2B-12 wt% Al...
master thesis 2016
document
Meijerink, M.J. (author)
To increase lifetime of the protective thermal barrier coatings (TBC) in jet engines and other gas turbines, a self-healing approach based on MoSi2 healing particle addition is considered. However, due to rapid oxygen transport in yttria-stabilized zirconia (YSZ), a common TBC material, premature oxidation is a major problem. This thesis...
master thesis 2015
document
Mao, W. (author)
master thesis 2013
document
Hille, T.S. (author)
Thermal barrier coatings (TBCs) are applied in gas turbines to enhance their thermal efficiency by isolating the metallic components from the aggressive hot gas. TBC lifetime is limited by damage processes originating at internal interfaces, which may ultimately lead to delamination and spallation. In the present thesis constitutive models are...
doctoral thesis 2009
document
Nijdam, T.J. (author)
The turbine blades in gas turbine engines need to be protected against high temperature oxidation and corrosion with a coating system. This coating system comprises of a Ni-based superalloy substrate, a NiCoCrAlY bond coating (BC) and an insulating ceramic thermal barrier coating (TBC). Good protection is offered when during service of the...
doctoral thesis 2005
Searched for: subject%3A%22Thermal%255C+barrier%255C+coatings%22
(1 - 18 of 18)