Temperature measurements during induction skull melting of titanium aluminide
Authors: Harding, R. A.; Wickins, M.
Source: Materials Science and Technology, Volume 19, Number 9, September 2003 , pp. 1235-1246(12)
Publisher: Maney Publishing
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 ~33°C when melting 4·5 kg of TiAl with 200 kW in a vacuum to ~44°C and ~62°C 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.
Document Type: Research Article
Publication date: 2003-09-01
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