Abstract
An immersion thermocouple and a twin wavelength infrared radiation pyrometer have been used to measure the temperature of titanium aluminide during melting in an induction skull melting furnace. A molybdenum-alumina cermet thermocouple sheath has been found to survive for long enough to enable about three reliable measurements to be made. A significant drift occurred between the temperatures measured using the pyrometer and the thermocouple when melting under a partial pressure of argon, and has been attributed to the generation of fume inside the melting vessel. The drift did not occur when melting was carried out in a continuously pumped vacuum. The superheat obtained increased from similar to33degreesC when melting 4.5 kg of TiAl with 200 kW in a vacuum to similar to44degreesC and similar to62degreesC when melting under argon partial pressures of 20 and 80 kPa respectively. There appears to be little benefit from increasing the applied power from 200 to 350 kW.
| Original language | English |
|---|---|
| Pages (from-to) | 1235-1246 |
| Number of pages | 12 |
| Journal | Materials Science and Technology |
| Volume | 19 |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 1 Sept 2003 |