Oxidation of tungsten in the W-Al2O3 system at temperatures from 2350 to 2500 K and pressures from 1 to 105 Pa
We examine chemical reactions that lead to the oxidation of tungsten in the W-Al 2 O 3 system at T = 2350–2500 K and p = 1–10 5 Pa. The results indicate that, for p ≥ 10 Pa, tungsten oxidizes through reactions with both Al 2 O 3 vapor and dissociation products (Al 2 O 2 , Al 2 O, AlO 2 , and AlO). F...
Gespeichert in:
| Veröffentlicht in: | Inorganic materials 2011-02, Vol.47 (2), p.152-155 |
|---|---|
| Hauptverfasser: | , , |
| Format: | Artikel |
| Sprache: | eng |
| Schlagworte: | |
| Online-Zugang: | Volltext |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| Zusammenfassung: | We examine chemical reactions that lead to the oxidation of tungsten in the W-Al
2
O
3
system at
T
= 2350–2500 K and
p
= 1–10
5
Pa. The results indicate that, for
p
≥ 10 Pa, tungsten oxidizes through reactions with both Al
2
O
3
vapor and dissociation products (Al
2
O
2
, Al
2
O, AlO
2
, and AlO). For
p
≤ 10 Pa, oxidation is due to direct reaction of tungsten with O and/or O
2
. For
p
≤ 2 Pa, tungsten may react with molten Al
2
O
3
. A detailed analysis of tungsten oxidation processes is intended to optimize parameters of the melt growth of corundum crystals. |
|---|---|
| ISSN: | 0020-1685 1608-3172 |
| DOI: | 10.1134/S0020168511010079 |