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Advanced nanocomposite tribo-adapting coatings for aeronautics

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The main objective is to develop novel nanocomposite coatings consisting of several phases and layers, and showing either super-hard or self-lubricating tribo-adapting properties depending on the functioning conditions. It is proposed to develop smart composite layer materials that respond to ambient conditions through modification of their properties in response to an external stimulus. It is proposed to improve the synergistic characteristics of amorphous DLC, such as bending strength, shear strength, elasticity, hardness, and adhesion of DLC through using multilayer "DLC-SiC-steel substrate" coatings and compositional modification of DLC-matrix itself by embedding of nanocrystalline WC, TMD and graphite inclusions into its volume. Tribo-adaptation of the proposed nano-composite coatings will be due to accumulation of the stable nanoscale (up to ~ 20 nm) inclusions on the coating surface. Two architectural approaches will be applied: multilayers (with individual layer thickness of 10-50 nm) or/and macro-homogeneous matrix layer enriched by super-hard and self-lubricating nano-inclusions. Spherical nano-sized particles allowing surface structure be similar to ball bearing will be of the special interest. The improved moisture-resistant selenium-based version of TMD will also bring about a substantial improvement in film durability (5-10 lifetime increase in drastically changing environment, e.g. air/vacuum/inert gas, at the thickness of 1 micron), whilst the low friction coefficients (0.02-0.05 in low humidity cycles and 0,08-0,2 in high humidity cycles) and the extended temperature operating range (up to 400 C) will be achieved. It is proposed to utilize the new technical approach - the hybrid technique of ion implantation and pulsed laser deposition - to achieve the original objectives. It is proposed to realize the ion-implantation processing of substrates and coatings by laser-plasma ions along with the deposition of a vapor flux. The enhanced adhesion will be achieved. Laser- assisted deposition in a buffer inert gas atmosphere will be used to suppress sputtering and ion-induced desorption of the deposited selenium, initiate nano-cluster formation and provide deposition of stoichiometric or/and nano-structured TMD material. It is also proposed to develop mathematical models to optimise both coating growth and the exploiting conditions. The role of such factors as ion-electron energy exchange, ionisation-recombination, etc. will be determined. Two-level model of tribo- contacts will be developed taking into account texture, micro- and nano- topography, loading and environmental factors, etc. A model of real contact will be based on 3D surface images. These coatings can be applied with thickness precision on a nanonometer scale in MEMS fabrication. The results can be potentially used in civilian aerospace programs (aircrafts, artificial satellites, etc.) and in some ground-based crucial units (X-ray rotating anodes; mass spectrometers, etc.

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Institut für Umweltanalysen
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Gottfried-Schenker Str. 18
09244 Lichtenau
Deutschland

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Letzte Aktualisierung: 6 September 2004

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Permalink: https://cordis.europa.eu/project/id/INTAS2003-51-4206/de

European Union, 2024