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Thermal Cycle Parameter Effects On The Stress State Failure Mechanisms And Life Prediction Of Thermal Barrier Coatings
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Book Synopsis Thermal Cycle Parameter Effects on the Stress State, Failure Mechanisms and Life Prediction of Thermal Barrier Coatings by : Swetha Sridharan
Download or read book Thermal Cycle Parameter Effects on the Stress State, Failure Mechanisms and Life Prediction of Thermal Barrier Coatings written by Swetha Sridharan and published by . This book was released on 2005 with total page 536 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Barrier Coating Workshop by :
Download or read book Thermal Barrier Coating Workshop written by and published by . This book was released on 1995 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Barrier Coatings by : Hongbo Guo
Download or read book Thermal Barrier Coatings written by Hongbo Guo and published by Woodhead Publishing. This book was released on 2023-01-18 with total page 490 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal Barrier Coatings, Second Edition plays a critical role in counteracting the effects of corrosion and degradation of exposed materials in high-temperature environments such as gas turbine and aero-engines. This updated edition reviews recent advances in the processing and performance of thermal barrier coatings, as well as their failure mechanisms. Novel technologies for the manufacturing of thermal barrier coatings (TBCs) such as plasma spray-physical vapor deposition and suspension plasma spray, are covered, as well as severe degradation of TBCs caused by CMAS attack. In addition to discussions of new materials and technologies, an outlook about next generation TBCs, including T/EBCs is discussed.This edition will provide the fundamental science and engineering of thermal barrier coatings for researchers in the field of TBCs, as well as students looking for a tutorial. Includes coverage of emerging materials, such as rare-earth doped ceramics Presents the latest on plasma spray-physical vapor deposition and suspension (solution precursor) Discusses the degradation of TBCs caused by CMAS attack and its protection Looks at thermally environmental barrier coatings, interdiffusion and diffusion barrier
Book Synopsis Life Prediction and Failure Mechanisms for Thermal Barrier Coatings by : Eui Yeol Lee
Download or read book Life Prediction and Failure Mechanisms for Thermal Barrier Coatings written by Eui Yeol Lee and published by . This book was released on 1991 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Barrier Coatings: Failure Theory and Evaluation Technology by : Yichun Zhou
Download or read book Thermal Barrier Coatings: Failure Theory and Evaluation Technology written by Yichun Zhou and published by Springer Nature. This book was released on 2022-10-08 with total page 943 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book highlights the failure theories and evaluation techniques of thermal barrier coatings, covering the thermal-mechanical–chemical coupling theories, performance and damage characterization techniques, and related evaluations. Thermal barrier coatings are the key thermal protection materials for high-temperature components in advanced aeroengines. Coating spallation is a major technical bottleneck faced by researchers. The extremely complex microstructure, diverse service environments, and failure behaviors bring challenges to the spallation analysis in terms of the selective use of mechanical theories, experimental methods, and testing platforms. In the book, the authors provide a systematic summary of the latest research and technological advances and present their insights and findings in the past couple of decades. This book is not only suitable for researchers and engineers in thermal barrier coatings and related fields but also a good reference for upper-undergraduate and postgraduate students of materials science and mechanics majors.
Book Synopsis Development of Reliability Based Life Prediction Methods for Thermal and Environmental Barrier Coatings in Ceramic Matrix Composites by :
Download or read book Development of Reliability Based Life Prediction Methods for Thermal and Environmental Barrier Coatings in Ceramic Matrix Composites written by and published by . This book was released on 2001 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Coatings for High-Temperature Structural Materials by : National Research Council
Download or read book Coatings for High-Temperature Structural Materials written by National Research Council and published by National Academies Press. This book was released on 1996-05-13 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book assesses the state of the art of coatings materials and processes for gas-turbine blades and vanes, determines potential applications of coatings in high-temperature environments, identifies needs for improved coatings in terms of performance enhancements, design considerations, and fabrication processes, assesses durability of advanced coating systems in expected service environments, and discusses the required inspection, repair, and maintenance methods. The promising areas for research and development of materials and processes for improved coating systems and the approaches to increased coating standardization are identified, with an emphasis on materials and processes with the potential for improved performance, quality, reproducibility, or manufacturing cost reduction.
Book Synopsis Damage Accumulation Mechanisms in Thermal Barrier Coatings by : Golam Newaz
Download or read book Damage Accumulation Mechanisms in Thermal Barrier Coatings written by Golam Newaz and published by . This book was released on 1998 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary focus of the investigation was to conduct a chronological evaluation of damage initiation and propagation in Electron Beam - Physical Vapor Deposition (EB-PVD) thermal barrier coated (partially stabilized zirconia) Rene N5 single crystal superalloy. Damage initiation and failure events due to thermal cycling were investigated. Early crack initiation was rationalized through interfacial asperity induced high stresses between the TBC and the PtAl bond coat . Analytical solution was forwarded for transient and steady-state residual stresses in the EB-PVD system. Oxide scale development as a function of time was predicted using Fick' S Law. The deviation of experimental results from Fick's Law was attributed to microcrack interaction and coalescence. Oxide scale induced internal pressure on crack surfaces was shown to be a plausible mechanism for microcrack growth. Buckling analysis was used to estimate the critical size of delamination necessary (sixteen times the TBC thickness) for spallation. It was shown that for various thermal cycles, spallation life can be estimated based on critical oxide layer thickness. Thermal wave imaging technique was used to track damage condition as a function of thermal cycles. It was found that saturation of thermal wave amplitude corresponds to spallation life of the sample. This work provides a mechanism-based framework for life prediction in TBC systems.
Book Synopsis Design of Thermal Barrier Coatings by : Mohit Gupta
Download or read book Design of Thermal Barrier Coatings written by Mohit Gupta and published by Springer. This book was released on 2015-05-05 with total page 93 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book details the relationships between microstructure, interface roughness, and properties of thermal barrier coatings. The author proposes a method for the reduction of the thermal conductivity of the ceramic layer in order to increase the lifetime of thermal barrier coatings. He includes models for the optimization of ceramic layer microstructure and interface roughness.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Thermal Barrier Coatings by : Krishna Praveen Jonnalagadda
Download or read book Thermal Barrier Coatings written by Krishna Praveen Jonnalagadda and published by . This book was released on 2019 with total page 57 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Effect of Damage Processes on Spallation Life in Thermal Barrier Coatings by :
Download or read book Effect of Damage Processes on Spallation Life in Thermal Barrier Coatings written by and published by . This book was released on 2001 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal barrier coatings (TBCs) provide thermal insulation to high temperature superalloys. TBCs consist of an outer ceramic layer that provides good thermal insulation due to the low thermal conductivity of the ceramic used, and the inner metallic bond coat layer that provides needed oxidation resistance to the underlying superalloy. The microstructure of the bond coat changed from high aluminum concentration beta-(Ni, Pt)3Al phase, which has a very good oxidation resistance, to beta-(Ni, Pt)3Al plus gamma'-(Ni, Pt)3Al dual phase microstructure due to oxidation and interdiffusion between the bond coat and the substrate during the thermal test in air. The microstructure change influenced the oxidation behaviors of the bond coat. Less protective oxide (Ni-rich) formed on gamma-(Ni, Pt)3Al due to depletion of aluminum, and the oxide scale on gamma'-(Ni. Pt)3Al ha less adhesion to the bond coat. The TGO Layer and bond coat was subjected to high residual radial stresses during cool down from oxidation temperature du to the thermal expansion mismatch between the different layers. The high residual stress initiated the damages in TGO layer, the TBC/TGO interface and the TGO/bond coal interface as well. The evolution of the damages in TBCs resulted in local loss in adhesion of the coating during thermal cycling. The formation and evolution of micro-decohesion was the key failure mechanism of TBC for lone term thermal cycling. Thermal wave imaging technique as non-destructive and non-contact method was successfully used to monitor the health of TBC. The results reveal that there was no major delamination in TBC specimens during thermal tests.
Book Synopsis Science and Technology of Thermal Barrier Coatings by : Yeon-Gil Jung
Download or read book Science and Technology of Thermal Barrier Coatings written by Yeon-Gil Jung and published by MDPI. This book was released on 2021-03-05 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt: TBC materials in the hot components of a gas turbine are exposed to extremely harsh environments. Therefore, the evaluation of various environmental factors in applying new TBCs is essential. Understanding the mechanisms for degradation which occur in comprehensive environments plays an important role in preventing it and improving the lifetime performance. The development of novel coating techniques can also have a significant impact on lifetime performance as they can alter the microstructure of the coating and alter the various properties resulting from it. This Special Issue presents an original research paper that reports the development of novel TBCs, particularly the application of advanced deposition techniques and novel materials.
Book Synopsis Failure Mechanism Analysis and Life Prediction Based on Atmospheric Plasma-Sprayed and Electron Beam-Physical Vapor Deposition Thermal Barrier Coatings by : Bochun Zhang
Download or read book Failure Mechanism Analysis and Life Prediction Based on Atmospheric Plasma-Sprayed and Electron Beam-Physical Vapor Deposition Thermal Barrier Coatings written by Bochun Zhang and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Using experimentally measured temperature-process-dependent model parameters, the failure analysis and life prediction were conducted for Atmospheric Plasma Sprayed Thermal Barrier Coatings (APS-TBCs) and electron beam physical vapor deposition thermal barrier coatings (EB-PVD TBCs) with Pt-modified -NiAl bond coats deposited on Ni-base single crystal superalloys. For APS-TBC system, a residual stress model for the top coat of APS-TBC was proposed and then applied to life prediction. The capability of the life model was demonstrated using temperature-dependent model parameters. Using existing life data, a comparison of fitting approaches of life model parameters was performed. The role of the residual stresses distributed at each individual coating layer was explored and their interplay on the coating's delamination was analyzed. For EB-PVD TBCs, based on failure mechanism analysis, two newly analytical stress models from the valley position of top coat and ridge of bond coat were proposed describing stress levels generated as consequence of the coefficient of thermal expansion (CTE) mismatch between each layers. The thermal stress within TGO was evaluated based on composite material theory, where effective parameters were calculated. The lifetime prediction of EB-PVD TBCs was conducted given that the failure analysis and life model were applied to two failure modes A and B identified experimentally for thermal cyclic process. The global wavelength related to interface rumpling and its radius curvature were identified as essential parameters in life evaluation, and the life results for failure mode A were verified by existing burner rig test data. For failure mode B, the crack growth rate along the topcoat/TGO interface was calculated using the experimentally measured average interfacial fracture toughness.
Book Synopsis Investigation of Critical Issues in Thermal Barrier Coating Durability by : Hyungjun Kim
Download or read book Investigation of Critical Issues in Thermal Barrier Coating Durability written by Hyungjun Kim and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: To more fully understand microstructural evolution and the development of damage in thermal barrier coating (TBC) systems, thermocyclic experiments were conducted on TBC specimens with and without top coats. The degradation of a PtAl (platinum modified aluminide) bond coat and a CMSX superalloy substrate were investigated for cyclic and quasi-isothermal heating to 1200 0C. To accelerate the oxidation of the specimens, the thermally grown oxide (TGO) was removed at 10 hour intervals. Scanning electron microscopy (SEM) and instrumented indentation were employed to investigate microstructural evolution and material property changes of the bond coat. The microstructural evolution of a PtAl bond coat is strongly affected by the type of thermal exposure and the presence of TGO. The differences between cyclic and quasi-isothermal heating indicate that stresses associated with cooling and heating significantly alter microstructural evolution. Damage to TBC specimens with EB-PVD (electron beam physical vapor deposition) processed YSZ (yttria stabilized zirconia) top coats, PtAl bond coats, and René N5 superalloy substrates was assessed during thermal cycling to 1200 0C. Acoustic emission (AE) techniques were used to temporally identify damage to the TBC. For automated, continuous, and high temperature AE detection, a custom made experimental setup with either a nickel-chrome alloy wire wave guide or an alumina wave guide was used. It was found that there are four distinct regions of AE activity during the life of a TBC. Throughout the cooling cycles, images of the top coat were collected with darkfield-type lighting. These images showed how undulations developed in the top coat. In addition, digital image correlation (DIC) was used to identify regions with interfacial damage. Finally, the images were used to analyze the spallation of the top coat. Cycling of an additional specimen was interrupted periodically for analysis with profilometry and SEM. The profilometry and SEM images were used to further investigate the failure mechanisms in TBCs. The experiments and analysis performed in this dissertation work have elucidated how various failure mechanisms develop during the life of TBCs. This work has improved the scientific understanding of TBCs and could aid in the development of improved life prediction models.
Book Synopsis Mechanisms Controlling the Durability of Thermal Barrier Coatings by :
Download or read book Mechanisms Controlling the Durability of Thermal Barrier Coatings written by and published by . This book was released on 2001 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
