Abstract
Spinel coatings on steel substrates have been obtained by a thermal spraying process. The projection has been done on cold or hot substrates. A further thermal treatment has been performed on some coatings formed on cold substrates. A good adhesion has been observed only on steels rich in oxidizable elements (Z38 CDV5). These coatings have been characterized and tested in a foundry. Adhesion tests have been done by the pulling method and by indentation. The concentration profiles of the most important elements from the metal/oxide interface to the bulk have been determined by EPMA analysis. This set of results has allowed us to show the importance of the coating microstructure and of the diffusion processes on the metal/ceramic bond strength and of the coating stability in contact to Al Si melted alloys. Such coatings are then good candidates to be used in a foundry to protect the casting tools, mainly when they are performed on heated surfaces.
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