DETERMINATION OF MELTING POINT AND OF THE SPECTRAL AND TOTAL EMISSIVITIES OF TUNGSTEN, TANTALUM, AND MOLYBDENUM IN THE SOLID AND LIQUID STATES USING A SIX-WAVELENGTH PYROMETER
The melting points measured are 3685 +- 10K for tungsten, 3290 +- 10K for tantalum and 2895 +- 8K for molybdenum. The spectral and total emissivities of tungsten, tantalum and molybdenum both in the solid and the liquid states have been measured as a function of the wavelength in the range from 500 to 1040 nm at temperatures between 2400 and 4000 K by a newly developed high speed six-wavelength pyrometer involving a pulsed multi-beam laser heating system. The spectral emissivity decrease with the wavelength in the solid region, reversely increase in the liquid region and remain constant and equal to the total emissivity at the melting point. The spectral emissivities at the x-point for the three metals is found to be equal to those at the melting points.
Bibliographic Reference: 10TH ETPC, EUROPEAN CONFERENCE ON THERMOPHYSICAL PROPERTIES, ROMA (ITALY), SEPT. 22-26, 1986 WRITE TO CEC LUXEMBOURG, DG XIII/A2, POB 1907 MENTIONING PAPER E 33038 ORA
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Record Number: 1989125052200 / Last updated on: 1987-11-01
Available languages: en