Abstract
Mo[sbnd]Re duplex film has been electrodeposited from aqueous solution innovatively and then applied to fabricate protective silicide coating for the Nb[sbnd]Ti[sbnd]Si based alloy successively. The XRD, SEM and EDS results indicated the formation of MoSi 2 /ReSi 2 /NbSi 2 compound coating after halide reactivated pack cementation (HAPC) treatment. Pesting oxidation of MoSi 2 layer was suppressed and the Nb[sbnd]Ti[sbnd]Si based alloy was effectively protected at 800 °C with a mass gain of 0.48 mg cm −2 after oxidation for 100 h. At 1250 °C, continuous mass gain was observed with a mass gain of 2.6 mg cm −2 after exposure of 10 h. The synergistic combination of MoSi 2 and NbSi 2 layer enabled admirable protection of the substrate, in which MoSi 2 layer worked as the major anti-oxidation coating and the NbSi 2 layer could be a reservoir for Si. The contrast experiments indicate that ReSi 2 layer could improve the integrity and adherence of MoSi 2 layer, reduce the outward diffusion of alloying elements and oxidation of NbSi 2 layer, and then improve oxidation resistance of the compound coating ultimately.
| Original language | English |
|---|---|
| Pages (from-to) | 11739-11748 |
| Number of pages | 10 |
| Journal | Ceramics International |
| Volume | 45 |
| Issue number | 9 |
| DOIs | |
| State | Published - 15 Jun 2019 |
Keywords
- Electrodeposition
- Intermetallic
- Oxidation
- Silicide coating
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