Samples of 40 mass%SiO2-40CaO-20Al2O3 (Glass) and 36mass%SiO2-36CaO-18Al2O3-10Fe 2O3(Fe-Glass) were melted by argon plasma arc, with iron rods used for arc ignition. A direct current transferred type plasma generator was used with an output power of 6 kW. During arc melting, the iron rod located in the centre of the molten glass was melted. During Glass melting, the oxygen partial pressure was kept constant in the chamber. On the other hand, during Fe-Glass melting, the oxygen partial pressure steeply increased in the initial stage and then gradually decreased. The chemical state of iron ion in Fe-Glass was changed from Fe3+ to Fe2+ rapidly. The evaporation rates from Glass and Fe-Glass were 3.8×10-7 kg/s and 2.0×10-7 kg/s, respectively. It has been concluded that the rate of evaporation from the molten glasses is affected by the oxygen partial pressure which is determined by the state of the iron oxides in the samples during the melting.
|Number of pages||7|
|Journal||Nippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals|
|Publication status||Published - 1999|
- Iron oxide
- Oxygen partial pressure
- Plasma arc melting