Table 23.
Comparison of the alloys in terms of the scale thickness, oxides in the scale, thickness of Sn rich area, Sn rich intermetallics forming in the latter and phases in the bulk microstructure after oxidation at 1200 °C.
| Alloy | Scale | Sn Rich Area | Bulk | ||
|---|---|---|---|---|---|
| Thickness (μm) | Oxides | Thickness (μm) | Sn Rich intermetallics | Phases | |
| ZX4 | 500 | Nb rich *, Nb and Si rich *, Ti rich * | 55 | Nb5Si3, Nb3Sn, Nb5Sn2Si, NbSn2 | Nb5Si3, Nbss, Nb3Sn, Laves phase |
| ZX6 | 300 | Nb rich, Nb and Si rich, Ti rich | 50 | Nb5Si3, Nb3Sn, Nb5Sn2Si | Nb5Si3, Nb3Sn |
| ZX8 | 250 | Nb rich, Nb and Si rich, Ti rich | 50 | Nb5Si3, Nb3Sn, Nb5Sn2Si | Nb5Si3, Nb3Sn, Laves phase |
* no WDS data for this oxide is available.