AVS 61st International Symposium & Exhibition
    Advanced Surface Engineering Tuesday Sessions
       Session SE+NS+TR-TuM

Invited Paper SE+NS+TR-TuM5
Multifunctional Protective Coatings for Aerospace Applications

Tuesday, November 11, 2014, 9:20 am, Room 302

Session: Nanostructured Thin Films and Coatings
Presenter: Etienne Bousser, Ecole Polytechnique de Montreal, Canada
Authors: E. Bousser, Ecole Polytechnique de Montreal, Canada
L. Martinu, Ecole Polytechnique de Montreal, Canada
J. Klemberg-Sapieha, Ecole Polytechnique de Montreal, Canada
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Ever increasing technical, economic and environmental requirements give rise to situations where modern equipment and components are often pushed beyond the limits of their design capabilities. This frequently leads to tribological deficiencies, such as lubrication breakdown, excessive wear and tribo-corrosion, resulting in increased operational costs, decreased efficiency and premature failure. Therefore, appropriate material’s selection for a given application must be guided by an accurate understanding of the intervening tribological processes while ensuring the maintained functionality of the surface for optimal application performance.

Solid Particle Erosion (SPE) occurs in situations where hard particles, present in the environment, are entrained in a fluid stream, and impact component surfaces such as in aircraft engines. It is well known that ductile materials erode predominantly by plastic cutting or ploughing of the surface, while brittle materials do so by dissipating the particle kinetic energy through crack nucleation and propagation. In the first part of this presentation, we examine the mechanisms by which surfaces dissipate the kinetic energy of impacting particles, and discuss the erosive response of hard protective coating systems. We investigate the means by which surface engineering can enhance erosion resistance, and correlate surface mechanical properties to the erosion behaviour. In addition, we will show that the architectural design of advanced coating systems is also well supported by finite element modelling of single particle impacts of the coated surfaces.

The second part of the talk will focus on the repairability of advanced coating systems. Indeed, because of the high fabrication costs of engine components, it is desirable to develop an effective and efficient industrially-viable technique to remove defective coatings with the aim of recycling the costly engine components. In particular, we will present our recent studies on the removal of TiN-based erosion resistant coatings using a non-line-of-sight reactive ion etching technique and a complementary laser ablation process.