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Microstructure, processing and performance of laser clad coatings

Master thesis project: students applied and experimental physics

Laser cladding by powder injection is a surface engineering technique of producing high quality and thick coatings on deficient substrates with a minimal heat input into the work piece. Usually, the main aim of laser cladding is to improve the hardness, wear, load impact and corrosion resistance of surfaces, by generating a protective layer of a different material. Laser cladding represents the following wide field for industrial applications.

Goal: The project consists of feasibility studies of the preparation of high performance thick coatings on metallic substrates using the laser surface cladding technique. The objective is to prepare Co and Fe based coatings at different processing conditions, to measure their basic mechanical properties, to observe the microstructural features on a micrometer scale and to relate them to the main laser processing parameters. Special attention will be devoted to "overlapped area" of laser tracks, which sometimes represents a weakest point inside the whole coating. The project is appropriate for students, which are enthusiastic to take a complete route from preparation, via characterization to properties. State-of-the-art experimental equipment will be mastered.

Experimental techniques: 2 kW Nd:YAG high power laser with CNC position and CMOS temperature field control, advanced Scanning Electron Microscopy (SEM) with Oriented Image Microscopy (OIM, see Fig.1) and Energy Dispersive Spectroscopy of X-rays, confocal microscopy, scratch, microhardness and tribotesting at room and elevated temperatures.

p5Fig.: OIM from the perpendicular cross section of two overlapped laser tracks created a Co based coating on the ordinary steel substrate. Different colors represent individual γ-Co grains with crystal orientations given in inserted pole figure.




Contact:
Dr. Vasek Ocelik, kamer gebouw 13.017, This e-mail address is being protected from spambots. You need JavaScript enabled to view it , tel: 050- 3633407
Prof.dr. J.Th.M. De Hosson, kamer gebouw 13. 041, This e-mail address is being protected from spambots. You need JavaScript enabled to view it