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Thermal Barrier Coatings

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Design of Thermal Barrier Coatings

Design of Thermal Barrier Coatings Book
Author : Mohit Gupta
Publisher : Springer
Release : 2015-05-05
ISBN : 3319172549
Language : En, Es, Fr & De

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Book Description :

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.

Progress in Thermal Barrier Coatings

Progress in Thermal Barrier Coatings Book
Author : ACerS (American Ceramics Society, The)
Publisher : John Wiley & Sons
Release : 2009-07-15
ISBN : 9780470526248
Language : En, Es, Fr & De

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Book Description :

This edition of the Progress in Ceramic Technology series compiles articles published on thermal barrier coatings (TBCs) by The American Ceramic Society (ACerS). It collects in one resource the current research papers on materials-related aspects of thermal barrier coatings and associated technologies. Logically organized and carefully selected, the papers in this edition divide into six categories: Applications Material Improvements and Novel Compositions Developments in Processing Mechanical Properties Thermal Properties Citations follow each title in the table of contents, making this a key resource for professionals and academia.

Thermal Barrier Coatings

Thermal Barrier Coatings Book
Author : Huibin Xu,Hongbo Guo
Publisher : Elsevier
Release : 2011-01-14
ISBN : 0857090828
Language : En, Es, Fr & De

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Book Description :

Effective coatings are essential to counteract the effects of corrosion and degradation of exposed materials in high-temperature environments such as gas turbine engines. Thermal barrier coatings reviews the latest advances in processing and performance of thermal barrier coatings, as well as their failure mechanisms. Part one reviews the materials and structures of thermal barrier coatings. Chapters cover both metallic and ceramic coating materials as well as nanostructured coatings. Part two covers established and advanced processing and spraying techniques, with chapters on the latest advances in plasma spraying and plasma vapour deposition as well as detonation gun spraying. Part three discusses the performance and failure of thermal barrier coatings, including oxidation and hot-corrosion, non-destructive evaluation and new materials, technologies and processes. With its distinguished editors and international team of contributors, Thermal barrier coatings is an essential reference for professional engineers in such industries as energy production, aerospace and chemical engineering as well as academic researchers in materials. Reviews the latest advances in processing and performance of thermal barrier coatings, as well as their failure mechanisms Explores the materials and structures of thermal barrier coatings incorporating cover both metallic and ceramic coating materials as well as nanostructured coating Assesses established and advanced processing and spraying techniques, including plasma vapour deposition and detonation gun spraying

Thermal Barrier Coating Workshop

Thermal Barrier Coating Workshop Book
Author : Anonim
Publisher : Unknown
Release : 1995
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Thermal Barrier Coatings for Advanced Gas Turbine and Diesel Engines

Thermal Barrier Coatings for Advanced Gas Turbine and Diesel Engines Book
Author : National Aeronautics and Space Adm Nasa
Publisher : Unknown
Release : 2018-09-25
ISBN : 9781724036841
Language : En, Es, Fr & De

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Book Description :

Ceramic thermal barrier coatings (TBCS) have been developed for advanced gas turbine and diesel engine applications to improve engine reliability and fuel efficiency. However, durability issues of these thermal barrier coatings under high temperature cyclic conditions are still of major concern. The coating failure depends not only on the coating, but also on the ceramic sintering/creep and bond coat oxidation under the operating conditions. Novel test approaches have been established to obtain critical thermomechanical and thermophysical properties of the coating systems under near-realistic transient and steady state temperature and stress gradients encountered in advanced engine systems. This paper presents detailed experimental and modeling results describing processes occurring in the ZrO2-Y2O3 thermal barrier coating systems, thus providing a framework for developing strategies to manage ceramic coating architecture, microstructure and properties. Zhu, Dongming and Miller, Robert A. Glenn Research Center NASA/TM-1999-209453, NAS 1.15:209453, E-11948

Thermal Barrier Coatings for Advanced Gas Turbine and Diesel Engines

Thermal Barrier Coatings for Advanced Gas Turbine and Diesel Engines Book
Author : Anonim
Publisher : Unknown
Release : 1999
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Science and Technology of Thermal Barrier Coatings

Science and Technology of Thermal Barrier Coatings Book
Author : Yeon-Gil Jung
Publisher : MDPI
Release : 2021-03-05
ISBN : 3036503188
Language : En, Es, Fr & De

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Book Description :

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.

Thermal Fatigue Testing of ZrO2 Y2O3 Thermal Barrier Coating Systems Using a High Power CO2 Laser

Thermal Fatigue Testing of ZrO2 Y2O3 Thermal Barrier Coating Systems Using a High Power CO2 Laser Book
Author : Dong-ming Zhu
Publisher : Unknown
Release : 1997
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

In the present study, the mechanisms of fatigue crack initiation and propagation, and of coating failure, under thermal loads that simulate diesel engine conditions, are investigated. The surface cracks initiate early and grow continuously under thermal low cycle fatigue (LCF) and high cycle fatigue (HCF) stresses. It is found that, in the absence of interfacial oxidation, the failure associated with LCF is closely related to coating sintering and creep at high temperatures. Significant LCF and HCF interactions have been observed in the thermal fatigue tests. The fatigue crack growth rate in the ceramic coating strongly depends on the characteristic HCF cycle number, N̂ sub HCF, which is defined as the number of HCF cycles per LCF cycle. The crack growth rate is increased from 0.36 micrometer/LCF cycle for a pure LCF test to 2.8 micrometers/LCF cycle for a combined LCF and HCF test at NĤ sub HCF about 20,000. A surface wedging model has been proposed to account for the HCF crack growth in the coating systems. This mechanism predicts that HCF damage effect increases with increasing surface temperature swing, the thermal expansion coefficient and the elastic modulus of the ceramic coating, as well as with the HCF interacting depth. A good agreement has been found between the analysis and experimental evidence.

Further Industrial Tests of Ceramic Thermal barrier Coatings

Further Industrial Tests of Ceramic Thermal barrier Coatings Book
Author : Curt H. Liebert
Publisher : Unknown
Release : 1982
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Further Industrial Tests of Ceramic Thermal barrier Coatings book written by Curt H. Liebert, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Modelling Thermal Conductivity of Porous Thermal Barrier Coatings for High Temperature Aero Engines

Modelling Thermal Conductivity of Porous Thermal Barrier Coatings for High Temperature Aero Engines Book
Author : Ramandeep Singh Ghai
Publisher : Unknown
Release : 2017
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Thermal Barrier Coatings (TBC) are used to shield hot sections of gas turbine engines, helping to prevent the melting of metallic surfaces. TBC is a sophisticated layered system that can be divided into top coat, bond coat, and the super-alloy substrate. The highly heterogeneous microstructure of the TBC consists of defects such as pores, voids, and cracks of different sizes, which determine the coating's final thermal and mechanical properties. The service lives of the coatings are dependent on these parameters. These coatings act as a defensive shield to protect the substrate from oxidation and corrosion caused by elevated temperatures. Yttria Stabilized Zirconia (YSZ) is the preferred thermal barrier coating for gas turbine engine applications. There are a certain number of deposition techniques that are used to deposit the thermal coating layer on the substrate; commonly used techniques are Air Plasma Sprayed (APS) or Electron Beam Physical Vapour Deposition (EB-PVD). The objective of this thesis is to model an optimized TBC that can be used on next-generation turbine engines. Modelling is performed to calculate the effective thermal conductivity of the YSZ coating deposited by EB-PVD by considering the effect of defects, porosities, and cracks. Bruggeman's asymmetrical model was chosen as it can be extended for various types of porosities present in the material. The model is used as an iterative approach of a two-phase model and is extended up to a five-phase model. The results offer important information about the influence of randomly oriented defects on the overall thermal conductivity. The modelled microstructure can be fabricated with similar composition to have an enhanced thermal insulation. The modelling results are subsequently compared with existing theories published in previous works and experiments. The modelling approach developed in this work could be used as a tool to design the porous microstructure of a coating.

Suspension Plasma Sprayed Nano Composite Thermal Barrier Coatings

Suspension Plasma Sprayed Nano Composite Thermal Barrier Coatings Book
Author : Fariba Tarasi
Publisher : LAP Lambert Academic Publishing
Release : 2011-06
ISBN : 9783844381702
Language : En, Es, Fr & De

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Book Description :

Thermal barrier coatings have been used for the last half century to protect parts in high temperature service from premature damage. Thermal barrier coatings are mostly produced by thermal spray techniques, especially plasma spray processes. They are widely used in the aerospace and automotive industries and in power plants, applications in which there is an ever-increasing demand for further improvement of functionality and durability. In the field of material design, use of composite coatings rather than monolithic material, and nano-structure instead of conventional grain sizes, are among the solutions most often considered. Suspension plasma spray is an innovative process for production of nano-structured thermal barrier coatings. This research was directed toward a superior thermal barrier coating using suspension plasma spray deposition of the alumina-yttria stabilized zirconia composite material with nano-crystalline structure. Crystallization of the amorphous phase is introduced as a new route toward nano-crystallinity in ceramics, as was previously applied in the metals and alloys.

Thermal Conductivity and Elastic Modulus Evolution of Thermal Barrier Coatings Under High Heat Flux Conditions

Thermal Conductivity and Elastic Modulus Evolution of Thermal Barrier Coatings Under High Heat Flux Conditions Book
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Release : 2018-06-15
ISBN : 9781721181797
Language : En, Es, Fr & De

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Book Description :

Laser high heat flux test approaches have been established to obtain critical properties of ceramic thermal barrier coatings (TBCs) under near-realistic temperature and thermal gradients that may he encountered in advanced engine systems. Thermal conductivity change kinetics of a thin ceramic coating were continuously monitored in real time at various test temperatures. A significant thermal conductivity increase was observed during the laser simulated engine heat flux tests. For a 0.25 mm thick ZrO2-8%Y2O3 coating system, the overall thermal conductivity increased from the initial value of 1.0 W/m-K to 1. 15 W/m-K, 1. 19 W/m-K and 1.5 W/m-K after 30 hour testing at surface temperatures of 990C, 1100C, and 1320C. respectively. Hardness and modulus gradients across a 1.5 mm thick TBC system were also determined as a function of laser testing time using the laser sintering/creep and micro-indentation techniques. The coating Knoop hardness values increased from the initial hardness value of 4 GPa to 5 GPa near the ceramic/bond coat interface, and to 7.5 GPa at the ceramic coating surface after 120 hour testing. The ceramic surface modulus increased from an initial value of about 70 GPa to a final value of 125 GPa. The increase in thermal conductivity and the evolution of significant hardness and modulus gradients in the TBC systems are attributed to sintering-induced micro-porosity gradients under the laser-imposed high thermal gradient conditions. The test techniques provide a viable means for obtaining coating data for use in design, development, stress modeling, and life prediction for various thermal barrier coating applications. Zhu, Dongming and Miller, Robert A. Glenn Research Center NASA/TM-1999-209069, NAS 1.15:209069, E-11625

Development and Fatigue Testing of Ceramic Thermal Barrier Coatings

Development and Fatigue Testing of Ceramic Thermal Barrier Coatings Book
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Release : 2018-06-21
ISBN : 9781721663019
Language : En, Es, Fr & De

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Book Description :

Ceramic thermal barrier coatings will play an increasingly important role in future gas turbine engines because of their ability to effectively protect the engine components and further raise engine temperatures. Durability of the coating systems remains a critical issue with the ever-increasing temperature requirements. Thermal conductivity increase and coating degradation due to sintering and phase changes are known to be detrimental to coating performance. There is a need to characterize the coating thermal fatigue behavior and temperature limit, in order to potentially take full advantage of the current coating capability. In this study, thermal conductivity and cyclic fatigue behaviors of plasma-sprayed ZrO2-8wt%Y2O3 thermal barrier coatings were evaluated under high temperature, large thermal gradient and thermal cycling conditions. The coating degradation and failure processes were assessed by real-time monitoring of the coating thermal conductivity under the test conditions. The ceramic coating crack initiation and propagation driving forces and failure modes under the cyclic thermal loads will be discussed in light of the high temperature mechanical fatigue and fracture testing results. Zhu, Dong-Ming and Choi, Sung R. and Miller, Robert A. Glenn Research Center NASA/TM-2004-213083, ARL-TR-3261, E-14561

Improved Bond Coatings for Use with Thermal Barrier Coatings

Improved Bond Coatings for Use with Thermal Barrier Coatings Book
Author : Anonim
Publisher : Unknown
Release : 1980
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

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Thermal Barrier Coatings Workshop

Thermal Barrier Coatings Workshop Book
Author : Lewis Research Center,United States. National Aeronautics and Space Administration,United States. National Technical Information Service
Publisher : Unknown
Release : 1985
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Thermal Barrier Coatings Workshop book written by Lewis Research Center,United States. National Aeronautics and Space Administration,United States. National Technical Information Service, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Thermal barrier coating by polymer derived ceramic technique for application in exhaust systems

Thermal barrier coating by polymer derived ceramic technique for application in exhaust systems Book
Author : Gilvan Barroso
Publisher : Cuvillier Verlag
Release : 2018-09-04
ISBN : 373698832X
Language : En, Es, Fr & De

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Book Description :

Thermal barrier coatings (TBCs) are ceramic coating systems developed to reduce the heat transfer from a hot medium to the coated parts. This technology can be used in automotive exhaust systems to reduce the heat transfer from the exhaust gases to the metal pipes. As a result, catalytic converters can reach the ideal temperature for the conversion of gases more quickly, reducing emissions. In order to be effective, coatings must be applied to the inside of pipes. However, conventional techniques for the preparation of ceramic coatings are not suitable for the deposition of coatings inside of long pipes with small diameter, or are too expensive. In this work, a TBC system was developed using the polymer-derived ceramics (PDC) technique. In this method, ceramic coatings are obtained by the thermal conversion of preceramic polymers into ceramics, after deposition of the coatings by simple lacquer techniques. Fillers are used to tailor the microstructure and the properties of the coatings. This book contains a review of the literature on PDC coatings, the procedures for the preparation of the TBCs, as well as their properties.

Thermal Conductivity of Ceramic Thermal Barrier and Environmental Barrier Coating Materials

Thermal Conductivity of Ceramic Thermal Barrier and Environmental Barrier Coating Materials Book
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
Release : 2018-06-19
ISBN : 9781721270675
Language : En, Es, Fr & De

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Book Description :

Thermal barrier and environmental barrier coatings (TBC's and EBC's) have been developed to protect metallic and Si-based ceramic components in gas turbine engines from high temperature attack. Zirconia-yttria based oxides and (Ba,Sr)Al2Si2O8(BSAS)/mullite based silicates have been used as the coating materials. In this study, thermal conductivity values of zirconia-yttria- and BSAS/mullite-based coating materials were determined at high temperatures using a steady-state laser heat flux technique. During the laser conductivity test, the specimen surface was heated by delivering uniformly distributed heat flux from a high power laser. One-dimensional steady-state heating was achieved by using thin disk specimen configuration (25.4 mm diam and 2 to 4 mm thickness) and the appropriate backside air-cooling. The temperature gradient across the specimen thickness was carefully measured by two surface and backside pyrometers. The thermal conductivity values were thus determined as a function of temperature based on the 1-D heat transfer equation. The radiation heat loss and laser absorption corrections of the materials were considered in the conductivity measurements. The effects of specimen porosity and sintering on measured conductivity values were also evaluated. Zhu, Dong-Ming and Bansal, Narottam P. and Lee, Kang N. and Miller, Robert A. Glenn Research Center NASA/TM-2001-211122, E-12971, NAS 1.15:211122

Rocket Thrust Chamber Thermal Barrier Coatings

Rocket Thrust Chamber Thermal Barrier Coatings Book
Author : Anthony P. Batakis
Publisher : Unknown
Release : 1985
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Rocket Thrust Chamber Thermal Barrier Coatings book written by Anthony P. Batakis, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Thermal Barrier Coatings Burner Rig Hot Corrosion Test Results

Thermal Barrier Coatings  Burner Rig Hot Corrosion Test Results Book
Author : P. E. Hodge
Publisher : Unknown
Release : 1978
ISBN : 0987650XXX
Language : En, Es, Fr & De

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Book Description :

Download Thermal Barrier Coatings Burner Rig Hot Corrosion Test Results book written by P. E. Hodge, available in PDF, EPUB, and Kindle, or read full book online anywhere and anytime. Compatible with any devices.

Loadings in Thermal Barrier Coatings of Jet Engine Turbine Blades

Loadings in Thermal Barrier Coatings of Jet Engine Turbine Blades Book
Author : Tomasz Sadowski,Przemysław Golewski
Publisher : Springer
Release : 2016-04-15
ISBN : 9811009198
Language : En, Es, Fr & De

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Book Description :

This book discusses complex loadings of turbine blades and protective layer Thermal Barrier Coating (TBC), under real working airplane jet conditions. They obey both multi-axial mechanical loading and sudden temperature variation during starting and landing of the airplanes. In particular, two types of blades are analyzed: stationary and rotating, which are widely applied in turbine engines produced by airplane factories.