Abstract
Novel siliconized Mo-Re coatings dedicated to applications in the glass industry are shown in this paper. The study aims at the characterization of morphology, phase composition, and oxidation behavior of siliconized Mo-based coatings deposited on a ceramic–metal substrate. Two coatings with different contents of rhenium were prepared using a hybrid process that includes atmospheric plasma spraying and pack siliconizing. The microstructure, chemical, and phase composition of the obtained coatings were characterized and compared to Mo coating. Moreover, a characterization of starting powders was performed. After the description of the coatings’ microstructure, oxidation tests were carried out at 1000, 1100, and 1200 °C. The surface condition of oxidized coatings was investigated. The structure of Re-containing coatings after the siliconizing process was comparable. Both were composed of Mo and (Mo,Re)Si2-ReSi1.75 layers. However, in the case of Mo-44Re (wt.%) coating, a higher concentration of rhenium silicide was observed compared to that of coating containing 15% Re. The Re-containing silicide layers were characterized by a presence of lower content of hexagonal MoSi2 compared to that of non-alloyed MoSi2. The oxidation resistance of both coatings containing rhenium was comparable; however, the one with a higher amount of Re exhibited slightly higher durability in high-temperature oxidation.
Highlights
The engineering materials dedicated to the glass industry are exposed to extremely harmful conditions, including high temperature, corrosion, oxidation, rapid temperature changes, and other factors (Ref [1, 2])
Novel siliconized Mo-Re coatings dedicated to applications in the glass industry are shown in this paper
The engineering materials dedicated to the glass industry are exposed to extremely harmful conditions, including high temperature, corrosion, oxidation, rapid temperature changes, and other factors (Ref 1, 2)
Summary
The engineering materials dedicated to the glass industry are exposed to extremely harmful conditions, including high temperature, corrosion, oxidation, rapid temperature changes, and other factors (Ref [1, 2]). The authors proposed a new concept of refractory products (Ref 14) This solution offers usage of other high-temperature materials (e.g., ceramic–metal composites) covered with Mo-based coatings. There is one more factor limiting the efficiency of Mo and the Mo-Re coatings in the glass industry This limitation which lowers the potential of these materials in glass industry applications is a very low oxidation resistance (Ref [24, 25]). This factor causes a low lifetime of the tools working under extreme conditions. The examination of their durability in terms of high-temperature oxidation was carried out
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