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Thermal barrier coatings : characteristics of microstructure and properties, generation and directions of development of bond

Moskal G.

Journal of Achievements in Materials and Manufacturing Engineering

2009

Vol. 37, nr 2

323-331

Purpose: The goal of the paper is to present the review of characterisation of microstructure, properties as well as technology of receiving the heat resistance layers used as bond coats in thermal barrier coatings. Design/methodology/approach: General structure characterisation of the final influence of individual TBC`s sublayers was described. Especially the detailed characterisation of bond coats such as MeCrAlY and aluminides diffusion coatings was showed (used for EB-PVD obtained TBC`s). Findings: The influence of modification of chemical composition was described on microstructure and property of bond coats as well. It defines reactive elements such as Hf and the noble metals - Pt influence on increasing of heat resistance of bond coats, and, as a consequence, the growth of durability of coating thermal barriers. Different methods of modification of basic layers, for example the additional aluminizing process of MCrAlY coating was described as well. Practical implications: Additionally, the other types of bond coats were characterised, typically used for energy conversion systems and in case of Diesel engines and especially bond coats for titanium and titanium aluminides alloys. Originality/value: In the last part of the paper, new concepts such as „smart coatings” and diffusion barriers were shown.

Thermal barrier coatings: Part 1 – characteristics of microstructure and properties, generation and directions of development of bond

Moskal G.

Archives of Materials Science

2007

Vol. 28, nr 1-4

100-112

In this article the review characterization of microstructure, property as well as technology of receiving the heat resistance layers used as bond coats in thermal barrier coatings was presented. General structure characterization end influence of individual TBC`s sublayers was described. Especially the detailed characterization of bond coats such as MeCrAlY and aluminides diffusion coatings was showed (used for EB-PVD obtained TBC`s). The influence of modification of chemical composition was described on microstructure and property of bond coats as well. It define of reactive elements such as Hf and the metals noble - Pt influence on increasing of heat resistance of bond coats, and in consequence the growth of durability of coating thermal barriers. Different methods of modification of basic layers, for example the additional aluminizing process of MCrAlY coating was described as well. Additionally others types of bond coats was characterized typically used in energy conversion systems and in the case of Diesel engines and especially bond coats for titanium and titanium aluminides alloys. In the last part of article new conceptions such as "smart coatings" and diffusion barriers was shown.