Thermal Conductivities of Slags for Ironmaking and Steelmaking

Nagata, Kazuhiro; Susa, Masahiro; Gotō, Kazuhiro

doi:10.2355/tetsutohagane1955.69.11_1417

Cited by 55 publications

(60 citation statements)

References 9 publications

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“…1) Thermal conductivities/diffusivities of liquid slags have been measured by different researchers. [2][3][4][5][6][7][8][9][10][11] They have reported the similar values of thermal conductivities although their temperature dependences are in disagreement with each other, that is, thermal conductivities measured by the hot-wire method have shown large negative temperature dependences, however, those measured by the laser flash method show the negligible or moderate positive or negative temperature dependences. With respect to the thermal conductivity/diffusivity of mould powders in the glassy and crystalline states, there are fewer previous reports available.…”

Section: Introductionmentioning

confidence: 85%

Effect of Crystallinity on Thermal Diffusivities of Mould Fluxes for the Continuous Casting of Steels

2004

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Section: Introductionmentioning

confidence: 85%

Effect of Crystallinity on Thermal Diffusivities of Mould Fluxes for the Continuous Casting of Steels

2004

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“…The thermal conductivity of the solution containing FeO is much higher than that without FeO, indicating that the practically formed 2CaO·SiO 2 solid solution with FeO in refining process would be much more penetrable to heat than ideal one. The effect of FeO addition to the slag on the thermal conductivity was reported to be positive for the CaO-SiO 2 -FeO-Al 2 O 3 system; 9) thereby, the present results are considered reasonable. Thermal conductivity has a close relation with electrical conductivity especially for good conductors like metal since heat and electric current are carried mainly by free electron.…”

Section: Resultsmentioning

confidence: 50%

Thermal Conductivity of 2CaO·SiO<sub>2</sub> Bearing Solid Solution

et al. 2017

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“…That is a effect of radiation in a transparent sample [10][11][12] Moreover, this effect must dominant in both the data from the present study and the reference data (Appendix II, Ref. A8)), which was obtained by the steady-state method for thermal conductivity measurement, because both the thermal diffusivities increased with increasing temperature (normally, the thermal conductivity of glasses decreased in high temperature range 12) ). This effect on the measurement of thermal diffusivity using DHTT will be discussed in the following paper.…”

Section: Parameters Determination (J J 1 and J J 2 ) For Thementioning

confidence: 95%

Factors on the Measurement of Effective Thermal Diffusivity of Molten Slag Using Double Hot Thermocouple Technique.

Kashiwaya

Ishii

2002

ISIJ International

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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 thermocouple 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 t 0.5 was obtained as follows:a(ϫ10 4 m 2 /s)ϭ0.000707(t 0.5 /t p ) Ϫ1.8946 The thermal diffusivity obtained from the experimental half-maximum time t 0.5 /t p (t p is the time of peak on the heat pulse) was in good agreement with the one from literature.KEY WORDS: thermal diffusivity; thermal conductivity; slag melt; laser flash; hot thermocouple; DHTT.DHTT and the laser flash method. The laser flash method is an excellent method and can predict a relatively suitable value of thermal diffusivity using Parker's method 4) (Eq. (3)). However, it will need a special alignment for the measurement of liquid and/or transparent material. Furthermore, a direct observation during measurement is almost impossible. On the other hand, the DHTT can observe the molten sample in situ. As shown in the previous study, 1,2) the solidification of mold slag is complicate phenomena including the bubble formation/breaking and the crystallization. It would be very important to know the sample image during measurement. The thermal diffusivity obtained from DHTT, however, is not yet established and it is not reported what kinds of factors affected on the measurement until now.For the preliminary approach to the application of the DHTT to the measurement of thermal diffusivity, the affecting factors on the measurement were elucidated from both the theoretical and the experimental method. In the case of laser flash method, an instantaneous laser pulse was used as a heat source and the temperature increase at the rear surface was measured by an infrared pyrometer (IR detector). In the case of DHTT, the temperature of one side thermocouple (CH-1, in Fig. 1) increased in a pulse shape and the other side of thermocouple (CH-2) was used as a detector. The typical temperature profiles of both CH-1 and CH-2 are shown in Fig. 2. The time t 0.5 at the half-maximum temperature (1/2 DT max ) was defined as shown in Fig. 2 and used for the calculation of thermal diffusivity according to the laser flash method (the details will be shown in below). The large differences between the laser flash method and DHTT are as follows: (1) Heat source is the order of several seconds (millisecond order in laser flash method). (2) Shape of pulse is not square. This factor might be decisive in bo...

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Thermal Conductivities of Slags for Ironmaking and Steelmaking

Cited by 55 publications

References 9 publications

Effect of Crystallinity on Thermal Diffusivities of Mould Fluxes for the Continuous Casting of Steels

Effect of Crystallinity on Thermal Diffusivities of Mould Fluxes for the Continuous Casting of Steels

Thermal Conductivity of 2CaO·SiO<sub>2</sub> Bearing Solid Solution

Factors on the Measurement of Effective Thermal Diffusivity of Molten Slag Using Double Hot Thermocouple Technique.

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