Table 21.
Comparison of the Nb and Nb and Si rich oxides formed in the scales of the alloys at 800 °C.
| Alloy | Nb + Ti | (Nb + Ti)/Si | Si + Sn | Si + Sn + Al | (Nb + Ti)/(Si + Sn) | (Nb + Ti)/(Si + Al + Sn) | Al + Cr + Sn | (Nb + Ti)/(Al + Cr + Sn) | Nb/Ti |
|---|---|---|---|---|---|---|---|---|---|
| Nb rich oxide | |||||||||
| ZX4 | 29.4 | 18.4 | 1.7 | 17.3 | 3.4 | 8.6 | 1.7 | ||
| ZX6 | 28.3 | 21 | 1.9 | 4.2 | 14.9 | 6.8 | 2.8 | 10.1 | 1.6 |
| ZX8 | 28.4 | 47.3 | 0.8 | 2.3 | 35.5 | 12.3 | 6.4 | 4.4 | 2.2 |
| Nb and Si rich oxide | |||||||||
| ZX4 | 20 | 1.5 | 13.5 | 1.5 | 0.7 | 29.7 | 2.4 | ||
| ZX6 | 22.7 | 2.4 | 9.9 | 11 | 2.3 | 2.1 | 1.6 | 14.1 | 2 |
| ZX8 | 22.2 | 2.1 | 10.9 | 12.5 | 2 | 1.8 | 2.5 | 8.9 | 2.2 |