This work investigates the processes involved in the formation of fragmented layers produced on the surface of ceramic coatings by means of laser melting. For the experiments, plasma sprayed zirconia was applied to steel substrates and treated with CO2 and Nd:YAG lasers. The modified layers were found to consist of macro-fragments 500-2000 µm in size, which in turn consist of micro-fragments 20-70 µm in size. Crack gaps were observed at both levels with widths of 10-15 µm and 1-5 µm, respectively. Heat resistance, hardness, density, and roughness were determined before and after laser melting, and the changes measured are shown to depend on emitted laser power. Paper includes a German-language abstract.
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Issue Section:Novel Processes and Analytical Techniques