Abstract
The production and the structure of a new kind of protective coating are described. The coating consists of a porous MoSi 2-layer which is impregnated with a low-melting tin-aluminium alloy. The SnAl phase, which is liquid at oxidation temperatures, forms a protective Al 2O 3 film and, owing to its mobility, confers self-healing properties to the coating in case fissures occur. The life of coated unalloyed molybdenum and Mo-TZM specimens in static and cyclic oxidation tests has been examined. The protective MoSi 2-coating combined with a tin-aluminium phase is particularly interesting in view of its increased reliability with respect to possible failures arising through the occurrence of local defects after short oxidation times. The loss of the protective effect during oxidation is attributed to structural modifications within the coating.
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