文档介绍：ISIJ International, Vol. 42 (2002), No. 1, pp. 71–79
Factors on the Measurement of Effective Thermal Diffusivity of
Molten Slag Using Double Hot Thermocouple Technique
Yoshiaki KASHIWAYA and Kuniyoshi ISHII
Division of Materials Science and Engineering, Graduate School of Engineering, Hokkaido University, Sapporo 060-8628
Japan. E-mail: ******@
(Received on June 21, 2001; accepted in final form on September 11, 2001)
The molten slags that are used not only in the continuous caster but also in every metal industry play an
important role and affect the quality of products. The authors initially developed the double hot thermocou-
ple technique (DHTT) for in situ observation of mold slag crystallization.
In this study, the DHTT was further developed to allow the measurement of the overall thermal diffusivity
of molten slag applying the principle of the laser flash method. The affecting factors (finite pulse time,
shape of pulse and heat loss from sample surface) on the measurement of thermal diffusivity using the
DHTT were discussed theoretically using both the analytical and the numerical methods. New relationship
between the thermal diffusivity a and the time at half-maximum temperature was obtained as follows:
ϫ 4 2
a( 10 m /s) ()
The thermal diffusivity obtained from the experimental half-maximum time t0