Open Access
Table 1
Chemical purity of the three investigated metallurgical states [weight ppm].
| Elements | 92% CR Ta | 25% CR Ta | Ref state | Analysis method |
|---|---|---|---|---|
| H | 0.9 | 4.0 | 0.9 | IGA |
| C | ∼3.9 | ∼4.5 | ∼3.4 | GDMS |
| C | <5 | <5 | <5 | IGA |
| N | <5 | <5 | 10 | IGA |
| O | 12 | 21 | 23 | IGA |
| Al | 0.11 | 0.11 | 0.03 | GDMS |
| Si | 0.03 | 0.03 | 0.01 | GDMS |
| Ca | <0.01 | <0.01 | <0.01 | GDMS |
| Ti | <0.001 | <0.001 | <0.001 | GDMS |
| Cr | 0.02 | 0.02 | <0.005 | GDMS |
| Fe | 0.01 | 0.02 | 0.01 | GDMS |
| Ni | 0.02 | 0.02 | <0.001 | GDMS |
| Cu | <0.005 | <0.005 | 0.01 | GDMS |
| Nb | 7.2 | 8.4 | 6.6 | GDMS |
| Mo | 0.86 | 0.95 | 0.71 | GDMS |
| W | 5.3 | 5.4 | 5.5 | GDMS |
| All the other impurities are below 0.01 wt. ppm. | ||||
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