Thirteenth European Conference on Chemical Vapor Deposition

J. Phys. IV France 11 (2001) Pr3-869-Pr3-876
DOI: 10.1051/jp4:20013108

Yttrium containing aluminide layers

Ch. Metz¹, G. Wahl¹, P. Bianchi², M. Innocenti³, D. Baxter⁴, N. Archer⁵ and R. Wing<sup>6

1</sup>  Institut für Oberflächentechnik und Plasmatechnische Werkstoffentwicklung, Technische Universität Braunschweig, Bienroder Weg 53, 38108 Braunschweig, Germany
²  CESI, Via Rubattino 54, 20134 Milano, Italy
³  Nuovo Pignone, Via F. Matteucci 2, 50127 Firenze, Italy
⁴  JRC Petten, Institute for Advanced Materials, 1755 Petten, The Netherlands
⁵  ATL, Progress Road, High Wycombe, Bucks HP12 4JD, U.K.
⁶  CUK, Bramble Way, Clover Nook Ind. Estate, Somercoates, Derbyshire DE55 4RH, U.K.

Abstract
The development of efficient gas turbines leads to an increasing of the combustion temperature. Therefore the improvement of the protective coatings for the turbine components is an important factor. These high temperature protective coatings enhance the oxidation and corrosion resistance of the nickel base material components. Different coating processes were developed and since several years NiAl and modified NiAl layers were used for this application. Based on an AlCl₃/Al/YCl₃ chemical vapour deposition process (CVD process) aluminum and yttrium containing aluminum coatings were investigated. The evaporation and codeposition processes were studied and GTD111 samples with different geometries were coated with aluminum and yttrium/aluminum. The composition of the coatings were determined and the measured yttrium amount of the layer was correlated with the deposition conditions. The prepared samples were tested in a thermal cycling oxidation test and the enhanced oxidation resistance of the yttrium containing coatings were shown.

© EDP Sciences 2001