Stress Development of MoSi2 Coatings on TZM Alloys and Degradation Resistance of the Coated TZM Alloys Under High Temperature Plasma Flame
High temperature stability of TZM alloys and optimized coating layer thickness have been investigated under high temperature plasma flame exposure. The TZM alloys were pack cementation coated with a powder mixture of Si, NaF and Al2O3 (25, 5 and 70 wt%) in an Ar atmosphere, resulting in the formation of MoSi2 and Mo5Si3 layers on the TZM alloy. The MoSi2 coated TZM alloys showed a significant improvement in flame-degradation resistance due to the presence of MoSi2 layer. Furthermore, computer simulation results show that a thick surface MoSi2 layer does not provide any beneficial effect in protecting the substrate. The effect of coating layers is discussed in terms of surface morphology and microstructural observations with weight changes during dynamic flame exposure.
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Document Type: Research Article
Publication date: April 1, 2016
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