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Design of Thermal Barrier Coatings: A Modelling Approach by Mohit Gupta PDF

By Mohit Gupta

ISBN-10: 3319172530

ISBN-13: 9783319172538

ISBN-10: 3319172549

ISBN-13: 9783319172545

This booklet info the relationships among microstructure, interface roughness, and homes of thermal barrier coatings. the writer proposes a mode for the aid of the thermal conductivity of the ceramic layer in an effort to raise the life of thermal barrier coatings. He comprises types for the optimization of ceramic layer microstructure and interface roughness.

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Extra info for Design of Thermal Barrier Coatings: A Modelling Approach

Sample text

Far-field radiation comes from the combustion gases which are at temperatures around 2,000 °C, having a spectral distribution same as that of a black body at that temperature. This far-field radiation makes a small contribution as the hot combustion gases have finite thickness and limited opacity and thus have reduced emissivity, which results in the far-field radiation being reduced by a geometrical factor. Near-field radiation comes due to the layer of cooler gas, at around 1,200 °C, which is adjacent to the topcoat.

D. thesis, Linköping University, Sweden 32 3 Characteristics of TBCs 39. Chen WR, Wu X, Marple BR, Patnaik PC (2006) The growth and influence of thermally grown oxide in a thermal barrier coating. Surf Coat Technol 201:1074–1079 40. Haynes JA, Rigney ED, Ferber MK, Porter WD (1996) Oxidation and degradation of a plasma-­ sprayed thermal barrier coating system. Hille TS, Turteltaub S, Suiker ASJ (2011) Oxide growth and damage evolution in thermal barrier coatings. Vaßen R, Jarligo MO, Steinke T, Mack DE, Stöver D (2010) Overview on advanced thermal barrier coatings.

Both TCF and thermal shock testing methods have their own limitations. TCF tests have the benefit that they provide information about sintering of topcoat, TGO growth in TBC system and the topcoat’s ability to sustain the induced stresses due to TGO growth and thermal mismatch. In this way, results obtained from TCF tests 40 4 Experimental Methods Fig. 5 Topcoat–bondcoat interface after failure showing the TGO growth are highly dependent on the bondcoat material and structure. The major limitation of TCF tests is the time taken for the tests to be completed, since it can take more than a month to obtain lifetime results.

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Design of Thermal Barrier Coatings: A Modelling Approach by Mohit Gupta


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