| Abstract: |
In order to enhance the adhesion of composite casting parts, Al-12Si coatings were flame sprayed onto their surface. The adhesion of such composite casting parts could be enhanced by a factor of 2 in comparison to blank castings and by a factor of 1,3 when compared to sand-blasted castings. This higher adhesion is believed to be due to the high surface roughness and the presence of pores in the coatings combined with the formation of an intermetallic phase at the interface. However, at the interface between the Al profiles and the flame sprayed coatings, it is also shown that cracks are formed, having a negative effect on the adhesion values. Therefore, an optimization of both the sand-blasting and the flame spraying parameters could be beneficial for a further enhancement of the adhesion of composite casting parts.
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