Article ID Journal Published Year Pages File Type
1477700 Journal of the European Ceramic Society 2007 9 Pages PDF
Abstract

Glass–alumina functionally graded coatings (FGCs) were produced via plasma spraying, a deposition technique for thick (>10–20 μm) coatings production, which ensures high flexibility and good reliability. The samples were obtained by building a graded glass–alumina coating onto an alumina substrate; the coatings were designed as multi-layered systems, each layer having a mean composition slightly different from the neighbouring ones. Two different compositional gradients were considered (from 100 vol.% alumina to 100 vol.% glass and from 80–20 vol.% glass to 100 vol.% glass) and several heat treatments were performed in order to improve the substrate-coating interface and induce a controlled transformation (sintering and/or crystallization) of the glassy phase. After a preliminary screening of the as-sprayed and the heat treated samples, the most interesting ones were carefully characterized, especially from a mechanical point of view. In fact, tests such as Vickers micro-indentation allowed to appreciate the effects of the graded compositional profile and the consequences induced by thermal treatments.

Related Topics
Physical Sciences and Engineering Materials Science Ceramics and Composites
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