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Journal Articles

Viscosity measurements of Molten casting steels for high temperature using an oscillating crucible viscometer

Takatsuka, Yuriko*; Matsumoto, Saori*; Nishi, Tsuyoshi*; Ota, Hiromichi*; Hori, Ayumi*; Hayashi, Kiichiro*; Yamano, Hidemasa

Jikken Rikigaku, 22(2), p.117 - 119, 2022/06

https://doi.org/10.11395/jjsem.22.117

This study clarified the effect of the viscosities of molten casting steels for high temperature by measuring them using the oscillating crucible method. The casting steels for high temperature samples used for viscosity measurements contained 0, 10, 20, 30, 40, and 50 mass% Ni. Viscosities were evaluated using Roscoe's equation and measured in the temperature range of 1693-1803 K.

Oral presentation

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 15; Viscosity measurement of 7mass%B$$_{4}$$C eutectic molten material

Nishi, Tsuyoshi*; Kokubo, Hiroki*; Takatsuka, Yuriko*; Ota, Hiromichi*; Yamano, Hidemasa

no journal, , 

The viscosity of the eutectic compound of boron carbide (B$$_{4}$$C) and stainless steel (SS) is necessary data for analyzing a severe accident. This paper describes the viscosity measurement of the eutectic compound of 7mass% B$$_{4}$$C-SS and its data verification, following the measurement of 5mass% and 10mass% B$$_{4}$$C-SS reported in JFY2017 and JFY2018.

Oral presentation

Viscosity measurement of molten SS-B$$_{4}$$C alloy

Kokubo, Hiroki*; Nishi, Tsuyoshi*; Ota, Hiromichi*; Takatsuka, Yuriko*; Yamano, Hidemasa

no journal, , 

The measurements of the viscosities of molten alloys at elevated temperatures is complex owing to the difficulty in handling low viscosity fluids such as SS-B$$_{4}$$C alloy. In this study, the viscosity of molten nickel (Ni) and stainless steel (SS) were measured using an oscillating crucible method to validate the performance of the viscosity measurement apparatus. This method is suitable for high-temperature molten alloys. A crucible containing molten metal was suspended, and a rotational oscillation was provided to the crucible electromagnetically. The friction of molten metal dampens the oscillation. The viscosity was determined from the period of oscillation and logarithmic decrement. The crucible was connected to a mirror block and an inertia disk made of aluminum, and then, suspended by a wire made of platinum-13% rhodium alloy. Laser light was used to irradiate the mirror. The reflection light was detected using photodetectors, and then, the logarithmic decrement of molten metal was determined. The viscosities of molten Ni and SS melts were measured up to 1823 K. From these results, the measured viscosity values of molten Ni and SS were found to be close to their literature values. The viscosity of molten SS-B$$_{4}$$C was determined in this study. However, B$$_{4}$$C composition dependence on the viscosity of molten SS-B$$_{4}$$C alloy is yet to be clarified.

Oral presentation

Study on eutectic melting behavior of control rod materials in core disruptive accidents of sodium-cooled fast reactors, 23; Viscosity measurement of 2.5mass%B$$_{4}$$C eutectic molten material

Nishi, Tsuyoshi*; Sato, Rika*; Takatsuka, Yuriko*; Ota, Hiromichi*; Yamano, Hidemasa

no journal, , 

The viscosity of the eutectic compound of boron carbide (B$$_{4}$$C) and stainless steel (SS) is necessary data for analyzing a severe accident. This paper describes the viscosity measurement of the eutectic compound of 2.5mass% B$$_{4}$$C-SS and its data verification, following the measurement of 5mass% and 7mass% B$$_{4}$$C-SS which has been measured.

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