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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.

Characterization of interfacial friction in orthogonal cutting when using heat isolating coatings.

Grzesik W., Niesłony P.

Advances in Manufacturing Science and Technology

2003

Vol. 27, nr 2

5-16

This paper provides a comprehensive knowledge on the frictional bahaviour exhibited during the cutting process resulting from the influence of so-called heat isolating coatings deposited on a WC-Co carbide substrate. For this purpose orthogonal end-turning tests with medium carbon and austenitic stainless steels when using tools treated with both multilayer coatings with intermediate Al2O3 ceramic layer and a monolayer (Ti,Al)N hard film, were performed. As a result, the fundamental frictional characteristics the friction force, the mean friction coefficient, the specific frictional energy and the corresponding thermal effects, the everage interface temperature and the frictional heat flux were determined. The mechanical, energy-based and thermal approaches to the frictional behaviour occurring in the carbide/ceramic coating-steel tribo-pairs were distinguished and quantified in terms of the process variables.

W pracy omówiono możliwe rodzaje tarcia podczas skrawania ortogonalnego stali węglowej i austenitycznej ostrzami pokrywanymi twardymi warstwami o zwiększonej izolacji cieplnej. Badano ostrza z trój-- i czterowarstwowymi powłokami z przejściową warstwą ceramiczną oraz monowarstwą (Ti,Al)N. Dokonano analizy modyfikacji procesu tarcia na podstawie zmian pola i długości styku, siły i współczynnika tarcia, energii właściwej tarcia oraz temperatury kontaktowej i strumienia ciepła tarcia. Wykazano istotne zmiany mechanicznego, energetycznego i cieplnego charakteru warunków kontaktu w strefie styku substrat/powłoka-wiór prowadzące do zmniejszenia tarcia.