By Huibin Xu, Hongbo Guo
Potent coatings are necessary to counteract the consequences of corrosion and degradation of uncovered fabrics in high-temperature environments reminiscent of fuel turbine engines. Thermal barrier coatings stories the most recent advances in processing and function of thermal barrier coatings, in addition to their failure mechanisms. half one experiences the fabrics and buildings of thermal barrier coatings. Chapters disguise either metal and ceramic coating fabrics in addition to nanostructured coatings. half covers verified and complex processing and spraying concepts, with chapters at the most modern advances in plasma spraying and plasma vapor deposition in addition to detonation gun spraying. half 3 discusses the functionality and failure of thermal barrier coatings, together with oxidation and hot-corrosion, non-destructive review and new fabrics, applied sciences and strategies.
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Extra resources for Thermal Barrier Coatings (Woodhead Publishing in Materials)
Sample text
Padture, Highly durable thermal barrier coatings made by the solution precursor plasma spray process, Surface and Coatings Technology 177/178 (2004) 97–102. 49. l. a. e. m. j. lutz, Effects of ion beam assisted deposition, beam sharing and pivoting in EB–PVD processing of graded thermal barrier coatings, Surface and Coatings Technology 177/178 (2004) 158–164. 50. s. raghavan, h. wang, Thermal properties of zirconia co-doped with trivalent and pentavalent oxides, Acta Materialia 49 (2001) 169–179.
Gradually from the metallic bond coat to the YSZ top coat, due to the formation of the transition layer. 33 In such a case, the traditional TBC materials, including YSZ as the ceramic top coat and MCrAlY as the metallic bond coat, might not be adequate. Recently, many efforts have been made to explore new TBC materials that can work at higher temperatures than traditional TBC materials. 34–38 Besides high- © Woodhead Publishing Limited, 2011 Thermal barrier coatings prepared by EB–PVD 19 temperature oxidation resistance, inter-diffusion between the bond coat and the superalloy substrate should be well controlled in order to prevent the formation of the so-called secondary reaction zone (SRZ), especially in the case of Ni-based single-crystal superalloy substrate.
72 × 10−3 cm2/s, respectively. Therefore, the APS CaSiO3 coating may be used as TBC on substrate such as titanium and titanium alloys. 3 Rare earth oxides The melting points of rare earth oxides are above 2200 °C. Except for the valence-changeable elements such as Ce, Pr, Eu and Tb, the other rare earth oxides have similar chemical, physical and mechanical properties. 112 No further reports about these materials are available. Most of the rare earth oxides are polymorphic at elevated temperatures,113 and the phase instability will certainly affect the thermal-shock resistance of their coatings to some extent.
