The evolution of thermal barrier coatings — status and upcoming solutions for today's key issues

Beele, W.; Marijnissen, G.; Lieshout, A. van

doi:10.1016/s0257-8972(99)00342-4

Cited by 260 publications

(111 citation statements)

References 2 publications

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“…This unique microstructure of coating is more expedient than EB-PVD counterparts in the way of low thermal conductivity. Thus, it is possible to produce * corresponding author; e-mail: karaoglanli@bartin.edu.tr thinner coating, providing bigger temperature reduction or working higher temperatures [4,5]. In APS TBCs, thermally grown oxide (TGO) growth behavior and sintering of topcoat are most signicant failure mechanisms to be examined.…”

Section: Eects Of Microstructural Transformation In Tbcs Consistingmentioning

confidence: 99%

Effects of Microstructural Transformation in TBCs Consisting of NiCrAlY Metallic Bond Coat and YSZ Ceramic Top Coat after Oxidation at 900°C

Parlakyiğit

Karaoğlanlı

2014

Acta Phys. Pol. A

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Thermal barrier coatings are applied to aeronautical and industrial gas turbine components to protect from detrimental eects of hot gases. Thermal barrier coating systems are generally composed of a substrate material, an oxidation resistant metallic bond coat, and a thermal protective ceramic-based topcoat. Additionally, thermally grown oxide layer is formed at ceramic/bond coat interface as a result of exposure of bond coat to high temperature. Oxidation mechanism is one of the major failure mechanisms of thermal barrier coatings. Thermally grown oxide layer plays signicant role as a oxygen barrier, but rapid thickening of thermally grown oxide leads to spallation failure of thermal barrier coatings. In this study, thermally grown oxide growth behavior was investigated at isothermal oxidation condition to evaluate durability of the thermal barrier coating system. The thermal barrier coating system consists of yttria stabilized zirconia (YSZ) topcoat and NiCrAlY bond coat deposited on Inconel 718 superalloy with atmospheric plasma spray technique. After coating process, specimens were exposed to 900• C air atmosphere for dierent periods up to 50 h. Ceramic/bond coat interface and thermally grown oxide layer were examined using scanning electron microscopy analysis. Besides, porosity contents and microhardness measurements were carried out to determine strength of coating. The results showed that thickness of thermally grown oxide layer increased and porosity rates of ceramic layer decreased with the eect of oxidation. Accordingly, the ceramic layer hardness increased due to high temperature eect.

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Section: Eects Of Microstructural Transformation In Tbcs Consistingmentioning

confidence: 99%

Effects of Microstructural Transformation in TBCs Consisting of NiCrAlY Metallic Bond Coat and YSZ Ceramic Top Coat after Oxidation at 900°C

Parlakyiğit

Karaoğlanlı

2014

Acta Phys. Pol. A

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“…They are simply the real and imaginary parts of a complex stress intensity factor, whose physical meaning can be understood from the interface traction expressions: K iK r K i r r (9) where r and θ are polar coordinates centered at the crack tip. The bi-material constant ε is defined as…”

Section: Interfacial Materials Fracture Toughnessmentioning

confidence: 99%

“…[3,4] Because of the need to maintain interfacial integrity at high temperatures under conditions of high heat flux, and the consequent effects on thermochemical stability and interdiffusion, it is difficult to obtain the combination of required properties from a single material; therefore coatings are used extensively. [5][6][7][8][9] These coatings comprise a thermallyinsulating layer of ceramic together with a metallic layer intended to develop a specific, protective oxide film beneath the ceramic as well as to provide the means of securing the ceramic to the metallic substrate. [10][11] Also relevant is the mechanical behavior of these different types of films, which can range in thickness from nanometers to microns.…”

Section: Introductionmentioning

confidence: 99%

An Innovative Technique for Thin Film Interface Toughness Research

Wang¹

2004

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“…It has been predicted that by the year 2030 all the present sources of fossil fuels would get depleted and the world would come to a stand still for need of fuel power. So, it is high time that scientists and technologists developed an alternate fuel that would run on the existing engines without many modifications and also one that would cater to the ever increasing power needs of the countries and domestic market (Beele et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on Performance and Emission Characteristics of Low Heat Rejection Diesel Engine with Ethanol as Fuel

Lawrence¹

2011

American Journal of Applied Sciences

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Problem statement: Depleting petroleum reserves on the earth and increasing concerns about the environment leads to the question for fuels which are eco-friendly safer for human beings. The objective of present work was to investigate the effect of coating on piston, cylinder head and valves of a Diesel engine on the performance and emission characteristics of exhaust gases using wet ethanol (5% water) as a fuel. Approach: In this study the effect of Zirconia coating on the performance and emission characteristics of diesel engine was investigated using ethanol as sole fuel. For this purpose the cylinder head, valve and piston of the test engine were coated with a partially stabilized Zirconia of 0.5 mm thick by the plasma spray coating method. . For comparing the performance of the engine with coated components with the base engine, readings were taken before and after coating. To make the diesel engine to work with ethanol a modification was done. Results: The engine's performance was studied for both wet ethanol and diesel with and without Zirconia coating. Also the emissions values are recorded to study the engine's behavior on emissions. Satisfactory performance was obtained with Zirconia coating compared with a standard diesel engine. The brake thermal efficiency was increased up to 1.64% for ethanol with coating and there was a significant reduction in the specific fuel consumption. The NOx, CO and HC emissions in the engine exhaust decreases with coating. Conclusion: Using ethanol as sole fuel for a LHR diesel engine causes an improvement in the performance characteristics and significant reduction in exhaust emissions.

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The evolution of thermal barrier coatings — status and upcoming solutions for today's key issues

Cited by 260 publications

References 2 publications

Effects of Microstructural Transformation in TBCs Consisting of NiCrAlY Metallic Bond Coat and YSZ Ceramic Top Coat after Oxidation at 900°C

Effects of Microstructural Transformation in TBCs Consisting of NiCrAlY Metallic Bond Coat and YSZ Ceramic Top Coat after Oxidation at 900°C

An Innovative Technique for Thin Film Interface Toughness Research

Experimental Investigation on Performance and Emission Characteristics of Low Heat Rejection Diesel Engine with Ethanol as Fuel

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