Co-based alloys are used extensively in applications requiring good wear resistance, corrosion and heat resistance. This paper presents the wear data of Co-based plasma sprayed coatings for aeronautical applications at temperatures up to 750 deg C, evaluated in a pin-on-disk unit. Investigation of the coating structure and the wear mechanisms revealed the processing-structure-functionality relationships. The analysis of the tribological results was supported by structure, microhardness and X-ray diffraction studies of the coatings. An SEM examination of the wear marks revealed the predominantly active wear mechanisms in each case. Paper includes a German-language abstract.